US884486A - Slotting-machine. - Google Patents

Description

.No. 384,486. I

PATENTED APR.`1.4, 1908. D. c. GRIGGS & R. H. SMITH.

` SLOTTING MACHINE. APPLIUAHOI; FILED JULY 25. 1906.

5 SHEETS-SHEET 1.

Wil/um PATBNTED APR. 14 D. C. GRIGGS & R. H. SMITH.

sLoTTING MACHINE. APPLICATION :FILED .IIILY Z5, 1906.

5 SHEETS-SHEET 2.

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BATENTBD APR. 14, 1908. D. C. GRIGGS & R. E. SMITH.

sLoTTING MACHINE.

APPLICATION FILED JULY 25, 1906.

5 SHEETS-SHEET 3.

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No. 884,486. y PATBNTBD APR. I4, 1908. D. C. G-RIGGS & R. H. SMITH.

sLoTTING MACHINE. APPLICATION FILED JULY 25, 1906.

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No. 884,488. .Y PATENTED .4818. 14, 1908.`

D. 8. 8818888 R. H. SMITH. I

SLOTTING MACHINE. APPLIOATIQN FILED JULY 85, 1908.

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UNITED STATES PATENT OFFICE.

DAVID C. GRIGGS AND ROY H SMITH, OF WATERBURY, CONNECTICUT, ASSIGNORS TO THE WATERBURY FARREL FOUNDRY AND MACHINE COMPANY, OF WATERBURY, CONNECTI- CUT, A CORPORATION OF CONNECTICUT.

SLOTTING-MACHINE T o all whom it may concern:

Be it kno'wn that we, DAVID C. GRIGGS and ROY H. SMITH, citizens of the United States, residing at I/Vaterbury, in the county of New Havenv and State of Connecticut, have invented certain new and useful Improvements in Slotting-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

Our invention relates to new and useful improvements in slotting machines, and refers more particularly to that type of machine used for slotting screw blanks.

It is the object of our invention, among other things, toproduce a machine of this character which will be automatic in its several operations have means for rigidly holding the blank during the slotting operation; means for ointing the blank, preferably during the s otting operation, means for adjusting the saw mechanism so as to vary the depth of the slot and the movement of the saw means for removing the bur from the 'head after the slotting operation; ejector mechanism; and to accomplish these results by parts that can be economically constructed and readily assembled.

To these, and other ends, our invention consists in the slotting machine, having certain details of construction and combinations of parts as will be hereinafter described and more particularly pointed out in the claims.

Referring to the drawings, in which like numerals of reference designate like parts in the several figures Figure 1 is a front view of my improved slotting machine Fig. 2 is a side elevation thereof looking from the right of Fig. 1 Fig. 3 is a side elevation looking toward the left of Fig. 1, Fig. 4 is a rear elevation with the hopper mechanism removed; Fig. 5 is a plan view of a portion of the mechanism, Fig. 6 is a front elevation of the blank holding mechanism, the bur trimming device and adjacent parts; Fig. 7 is a side elevation of the ejector mechanism Fig. S is an enlarged view of the holding mechanism and ejector plate Fig. 9 is a plan view, partially in section, of the slide head; Figs. 10 and 11 are a front elevation and plan view, respectively, of the slide connection, Fig. 12 is an elevation of the trimming cutter head; Fig. 13 is a detail plan view of the saw hood, Fig. 14 is a side elevation thereof Fig. 15 isa Patented April 14, 1908.

Serial No. 327,698.

cent parts, more es ecially illustrating the position of the hea gage; and Fig. 17 is a fragmentary view of one of the uprights forming part of the frame 3 Fig. 1S is a sectional plan view of some of the mechanism for im arting a lateral adjustment to the saw, ta en upon line A-B of Fig. 1.

In the practice of my invention I provide a bed 1 which is mounted upon suitable legs 2 and to which is secured a frame 3 within which is journaled a hollow shaft 4, and a driving shaft 5 having a pulley 6 and pinions 7 and 8 thereon. Upon a stud 9 fixed to the frame 3 is a gear 10 which meshes into the pinion 7 and has a pinion 11 Xed to the hub thereof. Adjacent to the stud 9 is a stud 12 having a gear 13 rotatable thereon which meshes into and is driven by the pinion 11 and having a pinion 14 upon its hub which meshes into and drives a gear 15 xed on the shaft 4. The rotary movement of the shaft 5 is transmitted to the hollow shaft 4 through the pinion 7, gear 10, pinion 11 gear 13, pinion 14 and gear 15, all of said gears and pinions having such relative diameters as will impart the proper relative speed of rotation of the hollow shaft with that of the driving shaft. The sizes of these gears may be changed to provide a variable speed of rotation, and to insure the proper intermeshing of i the teeth of these gears, the stud 12 is shiftably mounted in a slot 109 in the frame 3.

The numeral 16 designates the blank holding block which is adjustably secured to the frame 3 by the screw 17 and held against movement in its adjusted positions by the screw 18 threaded through the integral lug 1 9. Reciprocally mounted in the head 21 is a slide 22 having at its front end an angular face 23 opposite to an angular face 20 on the block 16. In said slide, adjacent to the angular face 23 is a depression of substantially the same depth as the diameter of the blank, and having a wall 24 adjacent thereto. Motion is imparted to this slide from a cam 25 fixed on the shaft 4 through a Swingin lever 26 mounted on a stud 27 in the brac ret 2S which is secured at both ends to the frame 3; a roll 29 rotatably. connected with said lever and operative within a groove in said cam 5 a rock sleeve 31 mounted in the head 21 upon an eccentric shaft 32; a connection 30` joining the lever 26 with said rock sleeve; and a link 33 connecting said slide and said rock sleeve 31. The eccentric shaft 32 is locked in its adjusted positions by the blocks 34 and 35 which lie within the head 21 and are connected by the bolt 36, By unloosening the bolt 36 the friction of the blocks 34 and 35 upon the shaft 32 Vis removed and the shaft may be rotated as desired, it is again locked by tightening the bolt 36 which draws the blocks 34 and 35 together and against the shaft 32 with sufficient friction to prevent its rotation.

The blanks to be operated upon are dropped into a hopper 37 which is mounted upon a standard 38 fixed to the bed 1. Rotatably mounted within said hopper is a shaft 39 having a pulley 40 thereon which is driven bya belt 41 connecting the pulley 42 on the shaft 4. A spider arm 43 is fixed on said shaft and during its rotation passes through and agitates the mass of. blanks in said hopper, lifting some of them into line with a chute which is composed of parallel side plates 44, a bracket 106, a top guide plate 45, which is secured so as toleave an open space between the top of said side plates and the underside of said guide plate, which will be substantially the same as the thickness of thel head of the blank, and a bracket 107. The hopper mechanism herein shown is only one of the many forms that can be used, and applicants do not claim said hopper as a part, of this invention. Said guide plate 45 is curved at its lower end so that the blanks as they slide by gravity down through the chute from the hopper are turned from a vertical to a horizontal position and the opening in the bottom end of said chute is directly above the depression in the slide 22 when the same is in its retracted position (see Fig. 6).

To insure the position of the blanks on the slide 22 we have provided a guide plate 108 which is fixed to'the bracket 107 (see Fig. 9) and lies substantially parallel to the direction of movement of said slide. It is designed that the blanks should drop into the depression in the slide 22 with the underside of the head against the side of the said slide, but if perchance this should not occur the relative position of the guide plate 108 is such that during the forward movement of the slide the head of the blank engages said plate and by such engagement the blank is moved on said slide so that before the stroke of said slide is completed the head of the blank will be brought up against the side of the slide, thus presenting all of the blanks to the saw mechanism in the same relative position therewith.

In operation the blanks drop from the chute into the depression in the top of slide 22 and the slide then moves forward until the blank, which lies against the wall 24, engages the angular face 20 of the block 16 where it is held rigidly and against movement, the blank being pinched sufficiently to prevent its rotation. The amount of pressure applied to hold the blank is varied by shifting the slide through the adjustment of the eccentric shaft 32 and by shifting the relative position of the block 16 on .the frame 3. This adjustment also provides means whereby the blank will be presented in line with the trimming mechanism herei inafter described.

in order that there may be no damage to any of the parts if perchance a blank should become clogged, either in the chute or in the slide, or any of the adjacent mechanism, we have provided means for joining the connection 30 `with the rock sleeve 31 so that some of the parts will yield if any strain above that of the normal strain is applied. This means comprises a stud 65 fixed in an arm ofthe rock sleeve 31 and passes through a slot 66 in the connection 30; a rod 67 movably connected with said connection rod and parallel therewith, one end of which abuts against an arm of the sleeve 31; and springs 68 secured at one end tosaid rod and at the other end to said connection, the said springs being of suiiicient tension to actuate the sleeve 31 and the slide 22 when the parts operate normally and the blanks pass through the operation successfully, but the tension is not sufiicient to actuate any of the parts if perchance the blank should become clogged or any of the mechanism broken.

The saw frame 46 is mounted and swings' upon a block 47; parted to this frame through a rock shaft 49 journaled in the bracket 28 having an arm 50 integral therewith carrying a roll 51 which lies against the periphery of a cam 52 fixed on the shaft 4; a crank arm 53 preferably formed integral with said rock shaft; a bolt 54 adjustably mounted within said crank arm; a threaded connection 55 rotatably mounted on said bolt 5 a similarly threaded connection 56 pivotally connected by a stud 57 to the saw frame 48; and a nut 58 threadably connected to both of said connections. The cam 52 is so shaped that no movement is given to the rock shaft 49 except when it is necessary to impart-a swinging movement to the saw and the roll 51 is held in permanent contact with said c-am by a spring 59. Journaled within said frame and the adjustable bearing 60 is the saw arbor 61 that is rotated through a gear 64 which meshes into the pinion 8, and having a saw 62 mounted thereon, endwise movement of which is prevented by the jam nuts 63. The cam 52 is so timed that as soon as the blank is held rigid between the block 16 and slide 22 the saw 62 will engage the head of said blank and cut the slot therein.

The amount of swing imparted to the saw frame is determined by the adjustment of A swinging motion is imthe bolt 54 within the crank arm 53, which adjustment provides means whereby the depth of the slot may be varied. This adjustment is also used to bring the saw into contact with the head as soon as the blank is secured, so that no time may be lost whether the head is a thin one with a small slot or a thick head with a deep slot. By properly regulating the adjustment, and using it in connection with the change gears, thus varying the number of cycles Der minute of the machine, the output will vary with different classes of work. The saw is moved laterally, to bring it into alinement with the center of the blank, by the lateral adjustment of the block 47 in the frame 3 which is accomplished by rotation of the set screws 103 which are threaded through the fixed posts 104 and impinge against the lug 105 on the block 47. During the period of adjustment the screws 48, which pass through slots 110 in the block 47 and are threaded into the frame 3, are loosened to allow block 47 to shift.

The saw sometimes, and more especially when it becomes dull, leaves a bur at the end of the slot cut in the blank, which bur has usually been removed by either placing the blanks into a tumbling barrel and the bur knocked oif by the engagement of one blank with another during the tumbling process, or else they have been removed manually. In some cases even the bur has not been removed but the screw used with a bur upon the head, which is unsightly in appearance and always damages and tears such articles as are brought in contact therewith. We have provided means for automatically removing this bur before the blank leaves the machine, which means comprises a reciprocating slide 75 mounted within the frame 3 and held against lateral movement by the caps 76; a knife 77 connected with the forward end of this slide a rock lever 78 having engagement with said slide and pivotally connected to a fixed part 79 on the frame 3 a friction roll 80 in said lever which lies against the edge of the cam 25 (see Fig. 5); and a spring 81 which moves the slide in one direction, said spring being connected at one end to said slide and at the other end to the frame 3.

The position of the depression 82 in the side of the cam 25 is timed so that immediately after the saw leaves the head of the blank the roll 80 will be in register with said depression and the spring 81 Will drive the slide 75 forward, at which time the knife 77 which moves in a path at substantially a right angle to the slot in the blank head will engage said bur and knock it off. The slide is then withdrawn by the roll 80 passing out of said depression.

The mechanism for pointing the ends of the blanks comprises a shaft 83 which is journaled within the hollow shaft 4 and is rotated by the gear 10 which meshes into and drives a pinion 84 on said shaft 83 a shaft 85 journaled in the standard 86; a beveled gear 87 fixed on the end of shaft 83 meshing into and driving a pinion 88 on shaft 85; a rock lever 89 fixed on a shaft 92 which is rotatable in an arm 93 integral with the standard 86 and carrying a roll 90 which lies against the face of a cam 91 Xed on the shaft 4; a yoke arm 94 journaled on the shaft 92 and carrying friction blocks 95 which lie within a recess in the block 96 `fixed to the shaft 85, said yoke arm 94 is adjustably connected with an arm 97, integral with the shaft 92, by the bolt 98 which passes through a slot 99,v and a set screw 100 threaded through said arm 97 and impinging` against the yoke arm 94. The adjustable connection between the yoke arm 94 and the arm 97 permits of an endwise adjustment of the shaft 85. Fixed to the foward end of the shaft 85 is a chuck 101 carrying a knife 102. The particular type of this chuck is not material to my invention, as any one of the numberless chucks used for this purpose is adaptable to my device, it being simply necesary to insert a cutting knife that will produce the desired result. While the blank is being held between the block 16 and slide 22 the shaft 85 is moved in the direction of its length toward said blank and the chuck engages and cuts the end of the blank which projects to the rear of said block at the same time that the head of the blank is being slotted. The ends of the blanks may be thus squared, rounded or pointed.

The ejector mechanism comprises a plate 69 secured to a rock lever 70 that is pivotally connected with the frame 3 by a stud 71 and having a friction block 72 thereon which lies against the periphery of a cam 73 fixed on the shaft 4. This mechanism is timed so that immediately after the blank is held between the block and slide the late 69 moves downwardly and enters the s ot 74 in the top of the slide 22, the bottom of said slot being on substantially the same horizontal plane as the bottom surface of the depression in the slide 22. Said plate is held in this position during all of the return movement of the slide and the blank is thereby pushed off as the slide is retracted and drops through an aperture in the bed of the machine into a receptacle conveniently located to receive it. This ejector plate is again raised as the slide begins to move forward, but only a sufficient distance to permit the blank to pass thereunder and thus prevent more than one blank passing out of the chute and traveling with the slide, the ejector thus serving a double purpose.

1n Figs. 13, 14 and 15 is illustrated a form of hood to inclose the saw, collect the chips, and prevent oil from iiying around the room and machine. This hood is designated 110 and has a lateral arm 111 by which the hood is secured to the head 21, and an opening 112 near its bottom 'end through which the chips and oil escape therefrom.y Threaded into the top of this hood is a pipe 113 by which oil is conducted from a convenient source of supply and dropped` onto the saw While rotating. All of the gears and pinions on our machine can be shifted or new ones of differing diameters substituted so as to provide for varying' relative speeds of rotation.

There are minor changes and alterations that can be made within our invention, aside from those herein suggested, and we would therefore have it understood that we do not limit ourselves to the exact construction herein shown and described, but claim all that falls fairly within the spirit and scope of our invention.

Ilaving described our invention, what we claim as new and desire to secure by Letters Patent, is:-

1 In a machine of the character described, the combination with a vertically adjustable stationary block having an angular contact face; of a horizontally movable block; a rock sleeve; an operative connection between said movable block and rock sleeve; a rotary shaft; and a cam actuated connection between said rotary shaft and rock sleeve.

2. In a machine of the character described, the combination with an adjustable stationary block having an angular contact face; of a movable block; a rock sleeve; an eccentric' shaft for said rock sleeve; a connection between said movable block and rock sleeve; and means for im arting movement to said rock sleeve at prei. eterinined periods.

3. In a machine of the character described,

the combination with an adjustable stationary block having an angular contact face; of a movable block; a rock sleeve; an eccentric shaft for said rock sleeve; means for adjusting the relative position of said eccentric shaft and said rock sleeve; a connection between said movable block and rock sleeve; and means for actuating said rock sleeve, whereby motion is imparted to said movable block.

4. In a machine of the character described, the combination with the blank slotting means; of a reciprocating slide; a knife attached to said slide; and means for actuating said slide to move the knife across the head of a screw and thereby automatically remove the bur therefrom without shaving the head.

5. In a machine of the character described, the vcombination with the blank holding means having a reci rocable part; of a chute arranged so as to deliver blanks onto said reciprocable part; and means adjacent to said reciprocable art and arranged to engage the head of said lank for adjusting the position thereof on said reciprocable part during the first portion of the movement thereof and leaving the head thereof uncovered during the latter portion of said movement.

6. In a machine of the character described, the combination with blank holding means, comprising a stationary block and a movable block; of a feed chute arranged so as to deliver blanks onto said movable block; and means for adjusting the osition of said blanks on said movable b ock before the same completes'its forward movement, said means comprising a fixed alinement plate which projects toward said stationary block an d terminates a short distance therefrom.

v7 In a machine of the character described, the combination with the blank holding means; of a slot cutting mechanism; a reciprocating bur removing knife; means for positively actuating said knife in one direction; and spring meansfor moving the same in the opposite direction.

8. In a machine of the character described the combination with the blank holding means and means for cutting slots in one enc of said blank; of a reciprocating bur removing knife; a rotary cam; and an intermediate lever between said knife and cam for actuating said knife.

9. 'In a machine of the character described, the combination with blank holding means; of means for presenting a blank to said holding means; mechanism for cutting a slot in one end of said blank and pointing the other end of the same blank at one and the same time; and aA reciprocating knife passing across the slotted end o f said blank for removing the bur after said slotting operation and while said blank is held by said holding means.

10. In a machine of the character described, the' combination with blank holding means; of saw means for slotting said blank; and a reciprocating cutter movable in the path and at substantially right angles to the axis of said blanks for removing the bur from said blanks formed by the slotting operation.

11. In a machine of the character described, the combination with a blank holding means, comprising a fixed block, a movable block having a crosswise depression in its upper surface near the frontend thereof of substantially the same depth as the diameter of the blank, and a slot therein at substantially a right angle to the aforesaid recess; means for reciprocating said movable block a feed chute for delivering blanks into the recess in said movable block; an ejector mechanism, comprising a plate lying between said feed chute and stationary block; and means for actuating the same, whereby said plate will be held above said movable block a sufficient distance to permit a single blank to pass thereunder when said block is in its retracted position and dropped into the slot in said movable block after said blocks have gripped the blank.

12. In a machine of the character described, the combination with non-rotatable blank holding means, said means comprising a stationary part and a movable part; and a swinging cam actuated ejector plate brought into the path of said movable part after the blank has been secured by said holding means, held stationary while said movable part is being withdrawn, and moved out of line therewith before another forward movement is imparted to said movable part.

13. In a machine of the character described, the combination with blank holding means having a reciprocating art; of a chute located so as to deliver b anks onto said reciprocating part when in one of its positions; and a stripper' plate arranged adjacent to said chute and in one position held a suflicient distance above the reciprocating part to permit a single blank to pass thereunder and escape from said chute and in its other position move down'back of the blank so that the same is stripped therefrom as the reciprocating part is being returned to its original position.

y141. In a machine of the character described, the combination with the stationary block 16; of the movable block 22 having a depression in the top surface thereof near the front end, the wall 24 forming one edge of said recess; a slot 74 in said movable block at right angles to the aforesaid recess and of substantially the same depth; a feed chute for delivering blanks onto said movable block; and an ejector plate 69 lying be tween said stationary block and feed chute and actuated so that during a portion of the reciprocation of said movable block the bottom of said late will be above the bottom of said movab e block and will lie within said slot 7 4 during another portion of its movement.

15. In a machine of the character described, the combination with blank holding means; of the slotting means and mechanism for pointing the end of the same blank during the slotting operation, said printing means comprising a rotary shaft, a pointing shaft with its axis substantially coincident with the axis of the blank while being slotted, a geared connection between said shafts, a pointing knife in the end of said ointing shaft, means for adjusting the endwise 1position of said shaft in relation to said ho ding means; and cam means for imparting an endwise movement to said shaft during the rotation thereof.

16. In a machine of the character described, the combination with blank holding endwise position of said shaft in relation tol said blank holding means, a rock shaft having connection with said shaft, and cam means for actuating said rock shaft, whereby said pointing shaft is reciprocated.

17. In a machine of the character described, the combination with means for holding the screw blank; of means for slotting the blank at one end and pointing the same at the other end, both of said operations being erformed at one andthe same time.

18. n a machine of the character described, tlie combination with means for holding the screw blank, said means being shorter than said blank; of means for slotting the blank at one end and pointing the same at the other end, both of said operations being performed at one and the same time.

In testimony whereof we aflixour signatures in presence of two witnesses.

DAVID C. GRIGGS. ROY H. SMITH.

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