JP3838365B2 - Tapping unit - Google Patents

Description

The present invention is a tapping unit, in particular, an appropriate processing device such as a press, which is attached to an appropriate position of the processing device, and in which the processing material including the prepared hole is appropriately processed. The present invention relates to a tapping unit in which a female screw is tapped by a tap interlocking with the raising and lowering of the apparatus.

In general, various intermediate products processed by an appropriate processing device such as a press often require female screw tapping, and conventional female screw tapping for such intermediate products is appropriately performed by an appropriate processing device such as a press. Usually, the intermediate product is transferred to a tapping device different from the processing device and positioned, and then the female screw is tapped into the pilot hole by the tapping device.

In addition, it is also known to attach a nut to an appropriate intermediate product by a suitable means in a conventional press to obtain a required product. Furthermore, after drilling a pilot hole in the work piece attached to the table of the first drilling machine with a drill attached to the chuck that moves up and down of the first drilling machine, the workpiece is tapped with a tap attached to the chuck of the second drilling machine. Is also known.

Problems in the prior art

As described above, in the conventional method of tapping a female screw to various intermediate products that often require tapping of a female screw, or attaching nuts to the pressed intermediate product by appropriate means, An intermediate product that has been appropriately processed including a pilot hole in the workpiece by the processing device is removed from the appropriate processing device, such as a press, and then mounted on a stand of a tapping device equipped with a tap installed in place. Align the pilot hole of the intermediate product on the stand with the tap, and then send the tap to the pilot hole along the thread lead of the tap and forcefully rotate the tap. It is usual to tread a female thread in the pilot hole of the intermediate product, that is, the forming process including the pilot hole processing of the intermediate product by an appropriate processing device such as the press and the pilot hole processing of the intermediate product are directly Staff Without tap because it was intended to at 2 different positions and tapping by Ri, each of tapping of the female screw by the tap, it is necessary to make troublesome centering the lower hole and tapping of the workpiece.

In addition, in the conventional method, it is necessary to perform force driving so that the tap feed and rotation drive to the intermediate product pilot hole are matched with the thread lead of the tap, and a complicated configuration is required. The force-driving device of the tap required for each tap size, that is, a device capable of force-driving differently adapted to the diameter of the tap and the lead angle of the thread.

In addition, for example, the tapping device using taps of Pronic, France, can be expected to have a temporary effect on tapping of specific or single standard female screws, but each tap size is different and the drive structure is suitable for each tapping size. There was a problem such as requiring selection.

Also, in other conventional presses that use the press die as a processing device as the drive source, the structure of the power transmission part is not only complicated, but a tapping device is attached to the press die. As a result of the complicated and troublesome work required to do this, there was a disagreement that caused the press die and, consequently, the press to become larger.

Further, the intermediate product in which the pilot hole is drilled with the drill attached to the chuck of the first drilling machine is aligned with the tap of the pilot drill attached to the table of the second drilling machine with the pilot hole. After mounting, if the screw is tapped with a tap attached to the chuck of the second drilling machine in the pilot hole of the intermediate product, the feed speed and rotation of the tap attached to the lead of the tap screw and the chuck of the second drilling machine (Linear) As a result of requiring a control means for tapping while achieving consistency of speed, the apparatus is complicated and the processing time is long, so that there are problems similar to the former.

In addition, in the tapping method by tapping the pilot hole of the intermediate product by an appropriate processing device such as the conventional press as described above, first, the tap for tapping the female screw is “mainly rotation and its rotation. A male screw type tool that forms a female screw in the pilot hole by feeding the screw in accordance with the lead of the screw (feeding and rotating the pilot screw in accordance with the lead of the female screw) (for example, OSG, October 2000) Revised version: tap processing, tap basics: reference), and tap tip tip details (see reference numeral 66 provision part in FIG. 2 schematically showing an embodiment of the present invention) are used for the tap body part (same figure). The lead that coincides with the lead of the reference numeral 65 (providing part 65) is tapered, and bites into the prepared hole (reference numeral 69 provision part of FIG. 3) of the workpiece (reference numeral 68 provision part of FIG. 3). The part is usually formed with the same tapping In, it was impossible to the tapping of different sizes. In addition, since the conventional tap stroke sends all strokes necessary for tapping with the same lead, it is difficult to increase the speed of the press linked to the tap.

The present invention is intended to solve the problems in the conventional example as described above. For example, a tapping unit is provided at an appropriate position of a press mold for pressing a workpiece, and the workpiece is processed by the press. Following the pilot hole drilling, the female thread is tapped by the next (second) press, and the female thread is tapped at a higher speed than the lifting speed in conjunction with the lifting and lowering of the processing device (mold) such as press working. At the same time, a tapping unit equipped with a tap holder that rotates at a high speed in conjunction with the elevation of the press is provided in the press die, and by applying the self-advancing action of the tap, tapping of the internal thread is possible and necessary. By simply replacing the tap attached to the tap holder of the tapping unit with a tap of a different size, it is possible to tweak different sizes of female threads. It is those intoxicated to.

Means for solving the problem

The present invention has been made by paying attention to the problems in the conventional tapping apparatus as described above. The cylinder 1 and the oil seal 44 of the tap support portion 40 on one side of the machine frame 11 is provided with an appropriate processing apparatus such as the press 1. A holder guide 50, which is driven to reciprocate in conjunction with elevation, is supported by a bearing 47, and a sleeve 51 and a tap holder 52 which are movable in the axial direction and are not relatively rotatable are sequentially arranged inside the holder guide 50. The end of the sleeve 51 is brought into contact with the inside of the peripheral edge of the piston / spring holder 45 slidably disposed in the pressurizing chamber 42 at the end of the cylinder / oil seal 44. The spring holder 45 and the end of the tap holder 52 are connected by a tension spring 56, and the inside of the piston combined spring holder 45 and the tap holder The compression spring 57 is arranged between the two end portions, and both are urged to always return the tap support portion 40 to a predetermined position of the cylinder-use oil seal 44, and at the lower inner side of the cylinder-use oil seal. And a return spring 59 that always returns the piston-use spring holder 45 to a predetermined position of the cylinder-use oil seal 44 in the gap 44B on the outside of the sleeve 51. Further, an appropriate compression air pressure is provided outside the piston-use spring holder 45. While the tap holder 52 is rotated forward while the tap 65 is applied, the tap 65 attached to the tap holder 52 is bitten into the pilot hole 69 of the workpiece 68 and the internal thread 69b is tapped, while the piston Eliminating compressed air pressure to the outside of the dual-purpose spring holder 45 and the tap holder 5 By the reverse rotation of a tapping unit as pulled from the threaded raised the internal thread 69b in the tap 65.

Further, the small gear 12 is driven to reciprocally rotate the holder guide 50 with the ring-shaped teeth 48 of the tap support portion 40 on the machine frame 11 in conjunction with the lifting and lowering of an appropriate processing device such as a press 1 for mounting the machine frame 11. The high spur gears 17, 21, 23, 26, 29, the large spur gears 22, 25, 28, and 31, and the high speed interlocking device 33, are driven to rotate at high speed. The piston-use spring holder 45 that contacts the inner side of the periphery of the sleeve 51 and the end of the tap holder 52 are connected by a tension spring 56, and the inner surface of the piston-use spring holder 45 and the tap holder are connected to the base of the sleeve 51. The compression spring 57 is placed between the end portions of 52 so that the tension spring 56 is in a fully contracted state when the compression spring 57 is not loaded. And setting, in which the energized so as to return both the predetermined position of the cylinder also serves oil seal 44 constantly the tap bearing 40.

Further, the inner diameter of the base of the cylinder combined oil seal 44 is made equal to the outer diameter of the sleeve 51, and the inner diameter of the end of the cylinder combined oil seal 44 is made slightly larger than the inner diameter of the base of the cylinder combined oil seal 44. The cylinder combined oil seal 44 is configured so that the inside of the piston combined spring holder 45 that is in sliding contact with the peripheral edge is brought into contact with the end of the sleeve 51 inside the slightly larger diameter portion of the end of the cylinder combined oil seal 44. A return spring 59 is disposed in a gap 44B between the inner side of the slightly larger diameter portion of the end portion of the seal 44 and the outer end portion of the sleeve 51 so that the piston combined spring holder 45 is always separated from the end portion of the holder guide 50. The tap holder 52 disposed in the sleeve 51 is returned to a predetermined position of the cylinder oil seal 44. Those who like to make.

Further, the small gear 12 is driven to reciprocally rotate the holder guide 50 with the ring-shaped teeth 48 of the tap support portion 40 on the machine frame 11 in conjunction with the lifting and lowering of an appropriate processing device such as a press 1 for mounting the machine frame 11. The high spur gears 17, 21, 23, 26, 29, the large spur gears 22, 25, 28, and 31, and the high speed interlocking device 33, are driven to rotate at high speed. The piston-use spring holder 45 that contacts the inner side of the periphery of the sleeve 51 and the end of the tap holder 52 are connected by a tension spring 56, and the inner surface of the piston-use spring holder 45 and the tap holder are connected to the base of the sleeve 51. The compression spring 57 is placed between the end portions of 52 so that the tension spring 56 is in a fully contracted state when the compression spring 57 is not loaded. And setting, in which the energized so as to return both the predetermined position of the cylinder also serves oil seal 44 constantly the tap bearing 40.

(Effects of the Invention) According to the invention of claim 1, the cylinder / oil seal 44 of the tap support 40 on one side of the machine frame 11 is driven to reciprocate in conjunction with the elevation of the processing device such as the press 1 as appropriate. A holder guide 50 is supported by a bearing 47, and a sleeve 51 and a tap holder 52, which are movable in the axial direction and are not rotatable relative to each other, are sequentially provided inside the holder guide 50, and the cylinder 51 is also provided at the end of the sleeve 51. The inner periphery of a piston / spring holder 45 slidably disposed in the pressurizing chamber 42 of the oil seal 44 is brought into contact, and the piston / spring holder 45 and the base end of the tap holder 52 are connected to a tension spring. 56, and a compression spring 57 is arranged between the inside of the piston / spring holder 45 and the end of the tap holder 52, so that both The tap support portion 40 is energized so as to return to a predetermined position of the cylinder / oil seal 44, and is automatically applied by applying an appropriate compressed air pressure to the outside of the piston / spring holder 45 and normal rotation of the tap holder 52. An advance action occurs, and the tap 65 attached to the tap holder 52 bites into the pilot hole 69 of the workpiece 68 to tread the female screw 69b, and eliminates the compressed air pressure from the outside to the piston / spring holder 45. By reversing the tap holder 52, the tap 65 is pulled out from the female screw 69b that is tapped and pulled back to a predetermined position (see II in FIG. 3), and the piston spring holder 45 is moved to a predetermined position (I in FIG. 3) by a return spring 59. To prepare for tapping the female thread 69b into the pilot hole 69 of the next workpiece 68.

According to the second aspect of the present invention, the holder guide 50 with the ring-shaped teeth 48 of the tap support portion 40 on the machine frame 11 is reciprocated in conjunction with the lifting and lowering of an appropriate processing apparatus such as the press 1 for mounting the machine frame 11. The small gear 12 to be rotationally driven is driven to rotate at high speed via the speed increasing interlock device 33 including a plurality of small spur gears 17, 21, 23, 26, 29 and large spur gears 22, 25, 28, 31, The tap 65 attached to the holder guide 50 is driven to rotate at high speed synchronized with various processes including the prepared hole 68 based on the elevation of the processing apparatus 1 such as the press, and the female screw 69b is inserted into the prepared hole 68 of the workpiece 68 at high speed. Screw on.

According to the third aspect of the present invention, the piston-use spring holder 45 that contacts the inner periphery of the sleeve 51 and the end of the tap holder 52 are connected to the base end of the sleeve 51 by the tension spring 56, and the piston-use A compression spring 57 is disposed between the inside of the spring holder 45 and the end of the tap holder 52 so that the tension spring 56 is in a fully contracted state when the compression spring 57 is not loaded. The support portion 40 is energized so as to be returned to a predetermined position of the cylinder combined oil seal 44 and is prepared for tapping into the pilot hole 69 of the next workpiece 68.

According to the invention of claim 4, the inner diameter of the cylinder combined oil seal 44 is made equal to the outer diameter of the sleeve 51, and the inner diameter of the end of the cylinder combined oil seal 44 is changed to the cylinder combined oil seal 44 base. The inner diameter of the piston / spring holder 45 slidably in contact with the periphery of the end of the sleeve 51 is abutted with the inner diameter of the cylinder / oil seal 44. A return spring 59 is disposed in a gap 44B between a slightly larger diameter inner side of the end portion of the cylinder / oil seal 44 and an outer end portion of the sleeve 51, so that the piston / spring holder 45 is always mounted on the holder guide. 50, the tap holder 52 arranged in the sleeve 51 is compressed so as to be separated from the end of the It is returned to a predetermined position of the Le 44, comprising the tapping of the next workpiece 68 under the hole 69.

According to the invention of claim 5, the tap support 40 at the end of the machine casing 11 is turned upside down with respect to the main body of the machine casing 11, and the ring-shaped teeth 48 around the holder guide 50 of the tap support 40 are By attaching to the large spur gear 31 at the end of the speed increasing transmission device 33 in the machine frame 11 so as to be interlocked, the tap 65 attached to the tap holder 52 in the holder guide 50 is simply replaced with a tap. By simply reversing the tap support 40 at the end of the machine frame 11 up and down with respect to the end of the machine frame 11, the workpiece 18 positioned below the end of the base frame 11 by the tap 65. A reverse female screw 69 c is tapped into the prepared hole 19.

According to the invention of claim 6, the ring shape around the holder guide 50, which is supported by the bearing 47 on the seal 44 which is also used as the cylinder of the tap support portion 40 at the end of the machine frame 11, is appropriately changed to the press 1 or the like. The first idler 117 is always meshed with one small gear 17 of the small gears 17 and 21 adjacent to each other of the incrementally interlocking device 33 that is driven at high speed by the small gear 12 that rotates forward and backward by the rack 9 that is interlocked with the elevation of the processing device. And the other small gear 21 is alternately meshed with either the first idler 117 or the second idler that is always meshed with the first idler 11 to rotate the holder guide 50 forward or reverse. By enabling driving, a tap 65 of a forward screw or a reverse screw is attached to the tap holder 52 in the holder guide 50 so as to face the lower hole 68 of the skin workpiece 68 forward. Flip to the tapping of 69b or reverse screw 69c.

Embodiment

Hereinafter, a first embodiment of the tapping unit according to the present invention and its modifications will be described with reference to FIGS. 1 to 11 and a second embodiment thereof with reference to FIGS. In addition, the same name and the same code | symbol are used for the part which is common in a 1st, 2nd embodiment and those modifications.

First embodiment

FIG. 1 is a schematic side view of a first embodiment of a tapping unit 10 according to the present invention. FIG. 2 is an enlarged vertical sectional view of a tap support portion 40 of the tapping unit 10. In FIG. A pump P built in the press machine to be fed and a switching valve 43B for feeding and opening compressed air are schematically shown by broken lines.
1 and 2 indicate that the tap support portion 40 located at the other end (right in FIG. 1) of the machine frame 11 of the tapping unit 10 can be mounted upside down. The assumed division positions are schematically shown.

FIG. 3 is an explanatory view of the operation of the tapping unit 10 provided in the lower mold 2 and the upper mold 3 of the press (processing apparatus) 1 (in FIG. 3, three), in particular, the tap support portion 40. FIG. 3I shows a state in which the tap 65 before feeding compressed air to the pressurizing chamber 42 of the tap support 40 is at a predetermined position (lower position in FIG. 3) of the tap support 40. II is a state in which the tip of the tap 65 bites into the pilot hole 69 of the workpiece 68 and the self-advancing action begins, and in FIG. 3 III, the tapping of the female screw 69b to the pilot hole 69 of the workpiece 68 is performed by the tap 65. Abbreviated state.

4 shows that when the tap 65 attached to the tap holder 52 of the tap support portion 40 of the tapping unit 10 is pushed toward the workpiece 68 lacking the prepared hole 69, the tip of the tap 65 is the workpiece. 68, abutting against the lower surface of 68 (same figure) and stopping as shown in FIG. 4 against the upward pressing of the tap holder 52 with the tap 65 attached by the collet 54 and the elastic pressure of the compression spring 57. And FIG. 5 is a plan view of the sleeve 51, and AA and B- in the plan view of the sleeve 51. B sectional view, FIG. 6 is a side view of the sleeve 51, and CC sectional view of the side view, FIG. 7 is a plan explanatory view and a side view of the holder guide 50 of the tap support portion 40, and FIG. Plane description 9 is an explanatory plan view of the piston combined spring holder 45 and the hook pin 46 inserted therein, FIG. 10 is an explanatory plan view of the tap holder 52, and FIG. 11 is a state where the tap 52 is bitten into the work material 68 pilot hole 69. It is a related schematic action explanatory drawing.

1 to 11, reference numeral 1 denotes a press for appropriately processing a workpiece 68 including a pilot hole 69 (however, various processing steps such as punching of the pilot hole 69 into the workpiece 68 and other moldings are performed as follows. 2 and 3 are a lower mold and an upper mold of the press 1, 9 is a rack interlocking with the press 1, 10 is a tapping unit, and 11 is a tapping unit. The machine frames 11A and 11B of the tapping unit 10 are the lower machine frame and the upper machine frame of the machine frame 11, and the upper and lower machine frames 11A and 11B are separably attached by bolts, nuts (not shown) or the like. 11D is an oil bath in the machine casing 11, 12 is a pinion provided on one side of the machine casing 11, 13 is a shaft of the pinion 12, 14, 15 are bevel gears, 16 is a shaft, 17 is a spur gear, 18 is a shaft, Reference numeral 19 is an idler, 20, 24, 27, 30 are shafts, 21, 23, 26, 29 are small spur gears, 22, 25, 28, 31 are large spur gears. The speed transmission device 33 is disposed in the oil bath 11D.

40 is a tap support portion at the end (right side in FIG. 1) of the machine frame 11 of the tapping unit 10, 41 is a machine frame of the tap support portion 40, and the machine frame 41 is divided into a lower machine frame 41A and an upper machine frame 41B. It is fixed in a separable manner by bolts and nuts (not shown). 42 is a pressurizing chamber on the end (lower part in FIGS. 2 and 3) side of the spring holder 44 serving as a cylinder, 43 is a compressed air inlet, and 43 B is a compressed air supply / discharge from the built-in press machine P to the compressed air inlet 43. The valve, 43D is an opening, the inner diameter of the base (upper in FIG. 2) of the cylinder / oil seal 44 is configured to be the same as the outer diameter of a sleeve 51 described later, and the inner diameter of its end (lower) is the base The inner diameter 44 </ b> A of the cylinder / oil seal 44 and the outer side of the sleeve 51 form a gap 44 </ b> B. 45 is a piston combined spring holder. The piston combined spring holder 45 reciprocates along the inside 44A of the large diameter end (bottom) portion of the cylinder combined oil seal 44, that is, in the vertical direction (FIG. 2) of the pressurizing chamber 42. It is slidably inserted.

45A is a step portion in the piston / spring holder 45 (upper side in FIG. 2), and the step portion 45A is inserted into the end (lower side) of the sleeve 51. 45B is a hole penetrating the piston spring holder 45 and its step 45A in the vertical direction (left and right in FIG. 9), 45D is a hole for inserting the hook pin 46 of the tension spring 56, 46D is the tension spring 56 of the hook pin 46. A hook hole 47 is provided in the upper machine frame 41 of the tap support portion 40. The bearing 47 is provided in the cylinder oil seal 44, and supports the holder guide 50 rotatably at a predetermined position. 48 is a ring-shaped tooth fixed around the holder guide 50 by a spline key (not shown) or the like, and 51 is slidable in the axial direction of the holder guide 50 in the axial direction so that it does not rotate relatively. 51A is a spline groove of the sleeve 51, 51B is a stepped portion of the sleeve 51, 51C is a pin hole of the sleeve 51, 51D is a coupling hole of the piston spring holder 45 and the sleeve 51, and 51F is A lock pin 52 is a tap holder provided in the sleeve 51 so as to be slidable by a required stroke in the axial direction thereof and not to be relatively rotatable.

54 is a collet provided (for example, pinned) inside the base (same as above) of the tap holder 52, 55 is an O-ring, 56 is a tension spring, and the base (same as above) of the tension spring 56 is the end of the tap holder 52. The end (the same lower part) of the tension spring 56 is locked by the hook pin 46 to the convex part 45 </ b> A of the piston spring holder 45. The tension spring 56 in the most contracted state in FIG. 57 is a compression spring, and the compression spring 57 is arranged inside the sleeve 51, between the end (the same as the lower part) of the tap holder 52 and the convex part 45A (the same as the above) side of the spring holder 45 serving as a piston. In the state of FIG. 2, the compression spring 57 is not substantially elastic, but by the cooperation of both, the tap holder 52 secures a predetermined position on the base (same as above) portion side of the sleeve 51 as schematically shown in FIG. To do.

59 is a return spring, and the return spring 59 is inserted into the gap 44B between the outer side of the end (same as below) of the sleeve 51 and the inside of the pressurizing chamber 52, and the end (same as the same) of the return spring 59 serves as a piston. The spring holder 45 is placed on the periphery (upper in FIG. 2) side, and is inserted into the base (same as above) portion of the sleeve 51, and thus, for example, the sleeve 51 by the elasticity of the return spring 59. The tap 65 held by 54 is supported at a predetermined position substantially coincident with the upper surface (FIG. 2) of the upper frame 41 of the tap support 40. The elasticity of the return spring 59 is set to be relatively weak enough to return the sleeve 51 and the like downward (FIG. 2) in a state in which compressed air is not supplied to the outside (same as below) of the piston spring holder 45. For example, a compressed air pressure of about 0, 5 to 5 atm is applied to the pressurizing chamber 42, the return spring 59 is reduced as shown in II of FIG. 3, and the tap 65 is placed on the lower surface of the workpiece 68 (FIG. 3). It is configured to be able to fast-forward to the tapping start position.

(Screw tapping of female thread) When moderate compressed air is introduced from the pump P into the pressurizing chamber 42 and the piston / spring holder 45 is pressed upward (FIG. 3), the upper die 3 of the press 1 is interlocked. The rack 9 descending 9A (FIG. 1) is made up of a small gear 12, bevel gears 14, 15, small spur gears 17, 19, 21, 23, 26, 29, large spur gears 22, 25, 28, 31 and the like. Via the transmission device 33, the holder guide 50 with the ring-shaped teeth 48 is rotated in a required direction (for example, clockwise) so that the female screw 69b (III in FIG. 3) can be tapped by the tap 65 (rotation of the tap 65). And the taper (guidance) portion 66 of the tap 65 is pushed into the prepared hole 69 provided in advance by the press 1 on the workpiece 68. ,That Complete (low) lead angle of the threads α starts tapping of the female screw 69b along the (Figure 11).

Inside the holder guide 50 with ring-shaped teeth 48, a sleeve 51 and a tap holder 52 are sequentially provided so as to be slidable by a required stroke in the axial direction thereof so as not to rotate relatively. A tap attached to the tap holder 52 with a collet 54 When 65 is driven to rotate at a high speed and an appropriate compressed air pressure is sent from the pump P to the pressurizing chamber 42 to the outside of the piston / spring holder 45 that contacts the end (lower in FIG. 2) of the sleeve 51, The piston combined spring holder 45 is lifted (FIG. 2) to reduce the return spring 59 and fast-feed like II in FIG. It is pushed into 69, and the internal thread 69b is tapped.

In the first embodiment, in FIG. 11, a tap 65 tip 66 having a thread having a required lead angle α is pressed into the prepared hole 69 of the workpiece 68 with an appropriate compressed air pressure (B in FIG. 11). The tap 65 is interlocked with the lowering of the upper die 3 of the press 1, and the tapered portion 66 (incomplete thread portion) of the tap 65 is moved to the workpiece 68 by the accelerated rotation drive (see the linear velocity A in FIG. 11). The internal thread Thread C along the lead angle α of the incomplete (low) thread of the tap 65 of the same tap 65 begins to be tapped, and the tap 65 ( Screwing is performed by the biting of the complete thread portion, that is, the so-called self-propelling action of the tap 65. This tendency is substantially the same for the tapping of the internal thread by the cutting die tap.

The taping unit 10 has a machine frame 11 mounted at a proper position of the lower mold 2 of the press 1 with a bolt and a nut, for example, and a rack that rises in conjunction with the lowering of the upper mold 3 of the press 1. 9, the bevel gears 14, 15, small spur gear 17, idler 19, small spur gears 21, 23, 26, 29, large spur gears 22, 25, 28, 31, shafts 20, 24, 27 The holder guide 50 with the ring-shaped teeth 48 of the tap support portion 40 is rotated at high speed so as to correspond to the gear ratio through the speed increasing transmission device 33 composed of 30, 30, and the like based on the rotation of the tap 65. The linear speed of the thread is rotated so that the feed speed of the tap 65, that is, the linear speed sufficiently higher than the raising / lowering speed of the upper die 3 of the press 1, and the sleeve 51 in the holder guide 50, the tap holder 52 , The tap 65 attached to the tap holder 52 with the collet 54 is rotated at a high speed (linear velocity), so that the tapping of the female screw 69B into the pilot hole 69 by the tap 65 is forced and the workpiece 68 is pressed. 1 The press working by raising and lowering the upper mold 3 and the tap 65 can be synchronously driven.

In order to raise or lower the tap 65, the switching valve 43B is opened to introduce an appropriate compressed air pressure from the pump P into the pressurizing chamber 42 through the compressed air inlet 43, thereby raising the piston combined spring holder 45 (FIG. 2). For example, the sleeve 51 and the tap holder 52 are raised from the I position to the II and III positions in FIG. 3, and the tapered portion 66 of the tap 65 that rotates at high speed is pushed into the prepared hole 69 of the workpiece 68 to bite. 3. Start tapping at position II in FIG.

Until the start of tapping at the position II in FIG. 3, the axial relative positions of the sleeve 51 and the tap holder 52 are hardly changed, and the tension spring 56 and the compression spring 57 are generally maintained in a neutral state. In this state, the pressure receiving area of the compressed air of the piston / spring holder 45 is the total area of the end face of the sleeve 51, the end face of the tap holder 52, and the collet 54 (more precisely, the end face of the tap holder 52). Total cross-sectional area≈the total area outside the piston portion of the piston / spring holder 45. On the other hand, there is almost no pressure change inside the sleeve 51 (upper in FIGS. 2 and 3) maintained at a predetermined position (neutral state) by the tension spring 56 and the compression spring 57. However, since the elastic force of the return spring 59 is weak, the sleeve 51, the tap holder 52, etc. together with the piston spring holder 45 are rapidly raised and fast-fed as shown in the position II in FIG. While cutting into the lower portion 69 of the pilot hole 69 of the workpiece 68, the tapping along the incomplete (low) thread of the tap 65 tip 66 is started. At this time or just before that, the side (upper side) of the peripheral edge of the piston / spring holder 45 comes into contact with the end (lower side) of the holder guide 50, and the piston / spring holder 45 and the sleeve 51 are positioned at their positions (see FIG. Stop at II).

As the pressure in the pressurizing chamber 42 is continuously increased by the compressed air that is fed, the compressed air in the pressurizing chamber 42 passes through the hole 45B (FIG. 9) of the piston / spring holder 45 to the inside of the end of the sleeve 51 (lower in the same figure). The air pressure of the same part is increased, the tap 65 held by the tap holder 52 and the collet 54 in the sleeve 51 is pressed, and both are raised against the sleeve 51 as indicated by III in FIG. An internal thread 69 b is tapped into the prepared hole 69 of the workpiece 68 by the rotating tap 65. During this time, the sleeve 51 is at a high position (III in FIG. 3) with respect to the cylinder / oil seal 44 and rotates at high speed while contacting the inner (same as above) surface of the piston / spring holder 45.

When the workpiece 68 of the tap 65 tip 66 starts to bite into the pilot hole 69, when the piston / spring holder 45 comes into contact with the end of the holder guide 50 (lower in FIG. 3) (II in FIG. 3), Since the end of the holder guide 50 (bottom in the figure) is covered on the inside of the spring holder 45 serving as a piston (upper figure), no compression air pressure is applied, and it stops at that position (II in FIG. 3) and pressurizes. The volume of chamber 42 does not increase any further. On the other hand, the compressed air is continuously supplied to the end (lower part of the figure) of the tap holder 52 and the collet 54. Moreover, since the area is sufficiently narrower than that of the pressurizing chamber 42, both of them rapidly rise, and the tap 65 tip 66 is formed. At this time, the pushing force is slightly increased and a self-advancing action is generated, so that the tap 65 begins to bite into the pilot hole 69. The tap 65 tip detail 66 bites into the pilot hole 69, and the tapping of the female screw 69b is started. Following the thread (incomplete) of the tap 65 tip detail 66, the regularity of the tap 65 body having the same lead as the screw thread The threaded portion bites into the incomplete female threaded portion tapped by the incomplete threaded portion, and the regular female thread 69 b is tapped by the tap 65.

Tap where the tap holder 52 and the collet 54 rise from the sleeve 51 base (upper figure) end of the collet 54 from the sleeve base end "R" to reach III in FIG. The tension of the tension spring 56 acts on the tap holder 52 until the tapping of the female thread 69b into the pilot hole 69 is completed. The tap 65 receives a pressing force corresponding to the cross-sectional area of the tap holder 52 and the collet 54 due to the compressed air pressure, and the female screw 69 b is tapped with a uniform pressing force to the tap 65.

When the tapping of the female screw 69b by the tap 65 is completed and the upper mold 3 is raised, the interlocking rack 9 is lowered, the tap 65 is reversed at high speed via the speed increasing transmission device 33, and at the same time the compression of the pressurizing chamber 42 is compressed. The air is released and the tap 65 is pulled out from the tapped female screw 69b while rotating (reversing) at high speed, and then returns to the predetermined position in FIG. It is provided for tapping the internal thread 69b into the hole 69.

(Tap contact with work piece lacking pilot hole) The tap 65 of the tapping unit 10 interlocked with the elevation of the upper mold 3 of the press 1 is temporarily attached to the lower mold 2 of the press 1 for some reason. Assuming a case in which the hole 69 is in contact with the lower side of the workpiece 68, the tap 65 of the tapping unit 10 operates safely as described below.
In FIG. 4, when the tap 65 rising by the compressed air pressure fed from the inlet 43 to the pressurizing chamber 42 comes into contact with the lower surface of the workpiece 68, the subsequent rising stops, and the collet 54 attached with the tap 65 becomes the sleeve 51. It stops in the state where the protruding height S of the end of the collet 54 base (upper figure) from the end of the sleeve 51 base (upper figure) is low. That is, the stroke corresponding to the height of the gap 44B≈Q + R remains in the cylinder / oil seal 44 without any operation. As a result, even if an abnormal situation occurs in which the tip 65 of the tap 65 comes into contact with the lower surface of the workpiece 68 lacking the pilot hole 66, the high-speed rotation (in this case, idle) state of the tap 65 is maintained. The tapping system of the female screw 69b to the pilot hole 69 provided in the next workpiece 68 is ensured.

(Modification 1) The tapping unit 10 of the first embodiment of the tapping unit according to the present invention has a tap support portion 40 on the side of the machine frame 11 and the like (right in FIG. 1), for example, a two-dot broken line 37 in FIG. In the position, the machine frame 41 of the tap support part 40 on the right side of the machine frame 11 main body (left side in FIG. 1) is configured to be separable, and the separable tap support part 40 of the machine frame 41 is The main body 11 is configured to be detachable with bolts and nuts (not shown), for example, so that the bolts and nuts can be loosened and removed from the main body 11 as necessary, and the tap support 40 is turned upside down. Then, it is put on the two-dot broken line 37 part of the machine frame 11 main body and fixed with bolts and nuts, and the tap 65 is rotated in the direction opposite to the tap 65 (upward in FIG. 2) of the first embodiment. By , The tapping of the opposite internal thread from the first embodiment. However, since the tap 65 attached to the tap support portion 40 and the tap holder 52 of the first modification is inverted with respect to the tap 65 of the first embodiment, in the first modification, Considering the consistency with the feed path of the tap 65 to the work material 68 pilot hole 69, it is necessary to take appropriate measures.

(Modification 2) Moreover, although the 1st embodiment of the tapping unit of this invention is not illustrated, it can replace with the speed-up transmission 33 in the machine frame 11, and can also be comprised as a transmission which does not speed up, In this case, the tap 65 supported by the tap support portion 40 is driven to rotate at substantially the same speed (linear speed) as the lifting speed only by interlocking with the lifting and lowering of the upper die 3 of the press 1, for example. Then, since tapping the prepared material 68 into the prepared hole 69 is performed, tapping of a large-diameter female screw can be performed.

Second embodiment

Next, a second embodiment of the tapping unit according to the present invention will be described with reference to FIGS. 12 and 13 in the schematic explanatory view of the rotation direction switching device 100 of the speed increasing transmission device 33C as the main part thereof. In addition, the same name and the same code | symbol are used for the part which is common in the 1st embodiment shown in the said FIGS. 1-11, and illustration and description about the structure of the part which are common in the said 1st embodiment are abbreviate | omitted. To do.

FIG. 12 shows the speed increasing transmission device 33C of the tapping unit 10C according to the second embodiment of the present invention (in which the power transmission direction switching device 100 is added to the speed increasing transmission device 33 of the first embodiment). FIG. 13 is a schematic plan explanatory diagram of a main part in a reverse state of the speed increasing transmission device 10 </ b> C.

12 and 13, the speed increasing transmission device 33C of the tapping unit 10C of the second embodiment is added with the switching device 100 that reverses the rotation direction to the speed increasing transmission device 33 of the tapping unit 10 of the first embodiment. Hit what you did. 101 is a support shaft concentric with the shaft 17, 102 is a first link, 103 is a first support shaft (concentric with the first idler 117), 106 is a second link, and 107 is a second support shaft concentric with the second idler 118. , 108 are second locking holes, 109 is a lock pin, and the lock pin 109 is provided at the end of the extension (operation / locking portion) 110 of the second link 106. Reference numeral 111 denotes an arc-shaped first guide hole, 112A denotes an end portion of the first guide hole 111 (the upper portion in FIGS. 12 and 13: the position of the first spindle 103 in the forward rotation state), and 112B denotes the first guide hole 111. 12 (lower part in FIGS. 12 and 13: position of the first spindle 103 in the inverted state) 113, 113 is the second guide hole, 114 A is the second lock part (second guide hole 113 end: FIG. 12). 13B, the left side portion: the position of the second spindle 107 in the forward rotation state) 114B is the second locking portion (the end portion of the second guide hole 113: in FIGS. 12 and 13, the right side portion: the second support shaft in the inverted state). 107), 115 is a second engaging hole, and the second locking hole 115 locks the lock pin 109 of the extension part 110 of the second link 106 in the normal transmission state, so that the normal rotation state (see FIG. 12). To maintain. 116 is a 3rd locking hole, and the 3rd locking hole 116 locks the lock pin 109 of the 2nd link 106 extension part 110 in a reverse transmission state, and maintains a reverse rotation state (refer FIG. 13). 117 is a first idler and 118 is a second idler.

(Operation of the Second Embodiment) The speed increasing transmission device 33C of the tapping unit 10C of the second embodiment is almost the same as the speed increasing transmission device 33 of the tapping unit 10 of the first embodiment. Although it is common in that the holder guide 50 with the ring-shaped teeth 48 that is rotatably supported by the tap support portion 40 is rotationally driven by the rack 9 that is interlocked with the lifting and lowering of the rack 9 via the speed increasing transmission device 33C, In the state of FIG. 12 in which the first idler 117 meshes with the small gear 21 by providing the switching device 100 that reverses the rotation direction between the pair of small spur gears 17 and 21 adjacent to each other in the transmission device 33C. The small spur gear 21 is substantially the same as the small spur gear 21 of the tapping unit 10 of the first embodiment, with the sleeve 51, the tap holder 52, the collet 54, and the like being connected via the high speed transmission device 33C. Outside to drive as, to the following effect.

The tapping unit 10C of the second embodiment switches the first and second links 102 and 106 of the rotation direction switching device 100 from the state of FIG. 12 to the state of FIG. When the 2 idler 118 is meshed with the small spur gear 21, the small spur gear 21 is reversed from the above, and for example, the rotation of the small gear 17 following the raising and lowering of the upper mold 3 of the press 1 is rotated through the idlers 117 and 118. A small spur gear in a state schematically shown in FIG. 12 is provided with a reverse screw tap 65B (not shown) that is transmitted to the gear 21 in the direction reverse to that in FIG. 12 and attached to the tap holder 52 of the tapping unit 10C by the collet 54. 21 is driven in the direction opposite to the tap 65 driven by the screw 21, and a reverse female screw (69 c: FIG. 3) is tapped in the prepared hole 69 of the workpiece 68. The preliminary structure and operation are substantially the same as those in the first embodiment.

The invention's effect

  Since the present invention has the above-described configuration and operates, the following specific effects can be obtained.

(1) According to the invention of claim 1, a tap that is supported by the tap support portion of the machine frame and rotates in conjunction with the processing device as appropriate is made by the appropriate compressed air pressure fed to the pressurizing chamber. By pushing into the pilot hole, the tap tip will bite into the workpiece pilot hole and the self-advancing action of the tap will cause the female screw to stand up. Therefore, it is possible to provide a tapping unit that is simple in structure and easy to operate at low cost, without the need for a troublesome driving device for feeding and rotating along the lead, that is, for synchronously driving the two.

(2) As in the conventional example, for each tap of different sizes, the same tapping is required without the need for a driving device that actively matches the lead of each tap and the lead of the screw according to its feed and rotation. By tapping the tap holder with the required diameter and lead thread on the unit's tap holder, it is possible to tapping different sizes of female threads

(3) The tap holder can be driven forward and backward, and in the case of forward rotation, the tap screw is attached to the tap holder with a collet, and in the case of reverse rotation, the reverse screw tap is attached. Without special adjustment by the tapping unit having the structure, the female screw can be tapped forward or backward in the prepared hole.

(4) If the outer shape of the tapping unit is configured to match the shape of the press mold, it can be easily attached to the existing press mold with, for example, bolts and nuts. Replacement work for mounting the unit to a die of another press can be easily performed without using a special tool or the like.

(5) Since this tapping unit can be mounted in the die of the press, it can be configured so that there is almost no part that can be touched manually during the operation of a processing apparatus such as a press provided with the tapping unit. Accidents such as being caught in a processing device or being pinched can be prevented.

(6) By adding one idler to the speed increasing transmission of the tapping unit, the rotation direction of the output portion can be reversed. It is possible to provide a tapping unit for tapping a reverse female screw without substantially changing the configuration.

(7) Provided is a tapping unit that allows tapping of female screws of different sizes by simply replacing the tap attached to the tap holder of the tapping unit with a tap of a different size.

(8) Since the tap is pushed into the prepared hole of the work piece with an appropriate compressed air pressure and the female thread is tapped, the rolling female thread of the rolled female thread is attached to the tap holder of the tapping unit with the same structure by attaching the rolling tap with the collet. By tapping and attaching a cutting die tap, tapping of a cutting female screw (however, excluding measures for eliminating cutting waste) can be performed in substantially the same manner.

(9) By providing a compression spring between the piston combined spring holder and the tap holder, even if abnormal stress occurs for some reason in a processing device such as a press or ancillary equipment, it is absorbed by the compression spring. Thus, the tapping unit, tap, processing device, etc. are protected.

(10) Conventionally, a metal processed product, for example, an automobile, in which the prepared hole processing on the workpiece and the tapping by tapping are separate processes or a nut configured separately at a required location must be attached by welding or the like Workpieces such as parts, heavy electrical parts, weak electrical parts, construction hardware, electrical parts, connectors and terminal blocks are attached to processing equipment such as presses, and pilot holes are provided in advance in the work material by the processing equipment. In addition, the internal thread can be tapped by a tap attached to the tap holder of the tapping unit.

(11) The holder guide of the tap support on the machine frame is driven to reciprocate in conjunction with the lifting and lowering of a processing device such as a press for mounting the machine frame, and the speed increasing interlock device is driven by a small gear on the machine frame. The tapping unit can be easily incorporated into the machining apparatus, particularly a series of machining processes linked to the raising and lowering of the machining apparatus. In addition, there is no need to secure a temporary storage space for the intermediate product after processing including the pilot hole in the workpiece by tapping the tap hole into the pilot hole. It eliminates the process identification and management man-hours for the tapping process for tapping, etc., shortens the delivery time of the product, and does not lead to forgetting to twist the target product. Expected stability, there is a cost benefit accordingly.

(12) According to the invention of claim 2, the ring-shaped toothed holder guide of the tap support portion on the machine frame is driven to reciprocate in conjunction with the lifting and lowering of an appropriate processing device such as a press for mounting the machine frame. An appropriate processing device such as the press is attached to the holder guide so as to be driven to rotate at high speed by a small gear through a speed increasing interlock device composed of a plurality of gears each having a small spur gear and a large spur gear fixed on each axis. This tapping is performed by tapping the internal thread of the work material with a tap that is driven to rotate at a higher linear speed than the work speed, synchronized with various processes including the work hole on the work material, The unit can be easily incorporated into an appropriate processing apparatus such as a press without causing a decrease in the processing speed.

(13) According to the invention of claim 3, the piston combined spring holder abutting on the inner periphery of the sleeve and the end of the tap holder are connected to the proximal end of the sleeve by the tension spring, and the piston combined spring holder inside A compression spring is arranged between the end of the tap holder and the end of the tap holder so that the tension spring is in a fully contracted state in the unloaded state of the compression spring. By energizing to return to the predetermined position, the compression spring plays the role of a shock absorber regardless of the pressure of the tap into the work material pilot hole regardless of the pressure of the compressed air to the pressurizing chamber. Thus, the compression spring can always push the tap against the prepared hole of the workpiece with a substantially uniform pressing force to tread the internal thread.

(14) According to the invention of claim 4, the inner diameter of the cylinder / oil seal base is made equal to the outer diameter of the holder guide, and the inner diameter of the cylinder / oil seal end is slightly larger than the inner diameter of the base. In addition, the inner surface of the piston-use spring holder that is in sliding contact with the peripheral edge is brought into contact with the end of the sleeve inside the slightly larger-diameter portion of the end of the oil seal that also serves as the cylinder. A return spring is arranged in the gap between the inner side and the outer side of the end of the sleeve, the piston / spring holder is constantly pressed away from the end of the holder guide, and the tap holder arranged in the sleeve is connected to the tap holder. Regardless of the size of the tap held in step 1, it is always used to return to the predetermined position to prepare for the tapping of the female thread into the next workpiece material pilot hole. It is possible.

(15) According to the invention of claim 5, the tap support portion at the end of the machine frame is not moved on the base (base) side of the machine frame, but only the tap support portion with respect to the main body. The tap holder in the holder guide is turned upside down by attaching the ring-shaped teeth around the holder guide of the tap support section to the large gear at the end of the speed increasing transmission in the machine frame. Without changing the tap attached to, a reverse female thread can be tapped in the prepared hole of the workpiece with the same tap.

(16) According to the invention of claim 6, the ring-shaped teeth around the holder guide supported by the bearing are linked to the lifting and lowering of the processing device such as a press appropriately on the oil seal for the cylinder of the tap support portion on one side of the machine frame. The first idler is always meshed with one small gear of a pair of small spur gears adjacent to each other in the speed increasing interlocking device which is driven at high speed by a forward and reverse rotating small gear, and the other small spur gear is Either one idler or the second idler that always meshes with the first idler is alternately meshed, and the holder guide can be driven forward or reverse, so that the tap holder in the holder guide By alternately mounting directional screws or reverse screw taps, the same tapping unit can be used to tread the forward and reverse female threads in the prepared hole of the workpiece. It is possible.

  It is a model side explanatory view of the 1st embodiment of a tapping unit concerning this invention.   It is an expansion longitudinal cross-section explanatory drawing of the tap support part of the tapping unit.   It is action | operation explanatory drawing of the tap support part.   It is action | operation explanatory drawing of the said tap support part when the tap attached to the tap holder of the tap support part contact | abuts to the workpiece which lacks a pilot hole.   They are the plane explanatory drawing of the sleeve of the tap support part, the AA sectional view of the same plane explanatory drawing, and the left side view.   It is the BB sectional view of the sleeve side view and the sleeve side view.   It is a plane explanatory view and its side view of the holder guide.   It is plane explanatory drawing of the collet which attaches a tap to the tap holder.   It is plane explanatory drawing of the piston combined spring holder 45 of the tap support part, and the hook pin 46 inserted in it.   It is a plane explanatory view of the tap holder of the tap support part.   It is a schematic operation explanatory view of the state where the tap held by the tap support part bites into the prepared hole of the workpiece.   It is a schematic plan explanatory drawing of the principal part of the rotation direction switching device (normal rotation state) of the speed increasing transmission of the second embodiment of the tapping unit according to the present invention.   It is a schematic plane explanatory drawing of the principal part of the rotation direction switching device (inversion state) of the speed increasing transmission.

Explanation of symbols

1 ... Press (processing equipment) 2 ... Lower mold 3 ... Upper mold 9 ... Rack (interlocked with press upper mold)
9A: Raising / lowering direction of rack 9 10, 10C ... Tapping unit 11 ... Machine frame of tapping unit 11A, 11B ... Lower machine frame, Upper machine frame 11D ... Oil bus 12 ... Small gear 13 ... Shaft ( Small gear, bevel gear) 14, 15 ... Bevel gear 16 ... Shaft (bevel gear, small gear) 17, 21, 23, 26, 29 ... Small spur gear 18, 20, 24, 27, 30 ... Shaft 19 ... idler 22, 25, 28, 31 ... large spur gear 33, 33C ... (speed increase) transmission 37 ... virtual dividing line (for tapping bearing reversal)
40 …… Tap support (the other end of the tapping unit)
41 …… Tap support part machine frame 41A, 41B …… Lower machine frame part, upper machine frame part 42 …… Pressure chamber 43 …… Compressed air inlet 43B …… Switching valve 43D …… Opening 44 …… Cylinder combined oil seal 44B: Clearance (between the cylinder oil seal 44 inner side and the sleeve 51 outer side)
45 ... Piston combined spring holder 45A ...... Step (Piston combined spring holder)
45B ...... Hole (Piston / Spring Holder)
45D …… Connection hole (for hook pin 46)
46 …… Hook pin (for tension spring 56)
46D …… Hook hole (Hook pin 46) 47 …… Bearing 48 …… Ring-shaped tooth 50 …… Holder guide 50B …… Key groove (holder guide outside) 50C …… Key (holder guide inside)
51 …… Sleeve 51A …… Spline groove (sleeve)
51B …… Step (sleeve) 51C …… Pin hole (sleeve)
51D: Pin hole (for hook pin) 51F: Lock pin 52 ... Tap holder 54 ... Collet 55 ... O-ring 56 ... Tension spring 57 ... Compression spring 58 ... Hook pin (for tension spring 59 ...) … Return spring 65 …… Tap 66 …… Tap tip details (guidance part)
68 …… Work material 69 …… Pre-hole 69b …… Female thread 69c …… Reverse female thread 100 …… Rotation direction switching device (speed increasing transmission device 33C)
101 …… Support shaft (concentric with shaft 17) 102 …… First link 103 …… First support shaft (concentric with the first idler) 106 …… Second link 107 …… Second support shaft (concentric with the second idler) 108 …… Second locking hole 109 …… Lock pin (second link extension)
110 …… Second link extension (operation, locking part) 111 …… First guide hole (arc-shaped)
112A ...... Upper end of first guide hole (first spindle position in forward rotation)
112B ... Lower end of first guide hole (first spindle position in inverted state)
113 …… Second guide hole 114A …… Left end of second guide hole (second spindle position in forward rotation)
114B ...... Right end of second guide hole (second spindle position in inverted state)
115 …… First locking hole (lock pin position in normal rotation)
116 …… Second locking hole (lock pin position in reverse)
117 …… First idler 118 …… Second idler A …… Linear speed of tapping (screw stand) B …… Tap feed speed C …… Tap thread (combination of A and B) direction D …… Virtual Thread direction α …… Tap thread lead angle β …… Virtual thread lead angle P …… Pump Q …… Protrusion height R from the upper machine frame of the sleeve R …… Protrusion from the sleeve base end of the collet Height (Completion of tapping)
S …… Height protruding from the sleeve base end of the collet (with missing pilot hole)
I, II, III ...... Tapping position of tapping unit installed in the 1st to 3rd presses

Claims (6)

  The holder guide (50) that is driven to reciprocate in conjunction with the lifting and lowering of the processing device such as the press (1) is bearing on the oil seal (44) serving as a cylinder of the tap support (40) on one side of the machine frame (11). A sleeve (51) and a tap holder (52) which are movable in the axial direction and are not rotatable relative to each other are sequentially arranged inside the holder guide (50). ) Is brought into contact with the inner periphery of the piston / spring holder (45) slidably disposed in the pressurizing chamber (42) at the end of the cylinder / oil seal (44). The combined spring holder (45) and the end of the tap holder (52) are connected by a tension spring (56), and between the inside of the combined piston spring holder (45) and the end of the tap holder (52). Pressure A spring (57) is arranged to urge both of them to always return to a predetermined position of the cylinder combined oil seal (44) of the tap bearing (40), and the cylinder combined oil seal (44). A return spring (59) is provided in the gap (44B) between the lower inner side and the outer side of the sleeve (51) to return the piston / spring holder (45) to a predetermined position of the cylinder / oil seal (44). The tap (65) attached to the tap holder (52) is moved forward by rotating the tap holder (52) while applying an appropriate compressed air pressure to the outside of the piston / spring holder (45). While the work material (68) is bitten into the pilot hole (69) and the female screw (69b) is tapped, the piston combined spring The tapping unit is characterized in that it is pulled out from the female screw (69b) tapped by the tap (65) by eliminating the compressed air pressure applied to the outside of the rudder (45) and reversing the tap holder (52). .   The holder guide (50) with the ring-shaped teeth (48) of the tap support (40) on the end of the machine frame (11) is used for raising and lowering a processing device such as a press (1) for mounting the machine frame (11). The speed increasing interlocking device (33) including a plurality of small spur gears (17, 21, 23, 26, 29) and large spur gears (22, 25, 28, 31) by a small gear (12) driven to reciprocate in conjunction with each other. The tapping unit according to claim 1, wherein the tapping unit is driven to rotate at a high speed via a).   The piston combined spring holder (45) that contacts the inner periphery of the sleeve (51) and the end of the tap holder (52) are connected to the base of the sleeve (51) by a tension spring (56), and the piston combined spring A compression spring (57) is placed between the inner surface of the holder (45) and the end of the tap holder (52) so that the tension spring (56) is in a fully contracted state when the compression spring (57) is unloaded. 3, and both are urged so as to always return both to a predetermined position of the cylinder oil seal (44) of the tap support (40). Tapping unit.   The inner diameter of the base of the cylinder combined oil seal (44) is equal to the outer diameter of the sleeve (51), and the inner diameter of the end of the cylinder combined oil seal (44) is set equal to that of the base of the cylinder combined oil seal (44). The sleeve (51) has a slightly larger diameter than the inner diameter, and the inner side of the piston / spring holder (45) in sliding contact with the peripheral edge inside the slightly larger diameter part at the end of the cylinder / oil seal (44). A return spring (59) is arranged in a gap (44B) between a slightly larger diameter inside of the end of the cylinder / oil seal (44) and an outside of the end of the sleeve (51). Thus, the piston and spring holder (45) is always pressed against the end of the holder guide (50), and the tap holder (5) disposed in the sleeve (51). ) The tapping unit according to claim 1, characterized in that so as to return to a predetermined position of the cylinder also serves the oil seal (44).   A ring-shaped tooth around the holder guide (50) of the tap support (40) by turning the tap support (40) at the end of the machine frame (11) upside down with respect to the main body (11). (48) is attached to the large gear (31) at the end of the speed increasing transmission (33) in the machine frame (11) so as to be interlocked. The tapping unit described.   The ring-shaped teeth (48) around the holder guide (50) supported by the bearing (47) are pressed on the cylinder oil seal (44) of the tap support (40) on one side of the machine frame (11). ) Etc., the small spur gears (17, 21) adjacent to each other of the speed increasing interlock device (33) driven at a high speed by the small gear (12) rotating in the forward and reverse directions by the rack (9) interlocking with the elevation of the processing device. The first idler (117) is always meshed with one small spur gear (17), and the first idler (117) and the first idler (117) are always meshed with the other small spur gear (21). The tapping according to any one of claims 1 to 5, wherein any one of the two idlers (118) is alternately meshed so that the holder guide (50) can be driven forward or backward. unit.

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