US1814250A - Machine for making pivot pins - Google Patents

Description

July l4, 1931. J. Q. HOLMES MACHINE FOR MAKING PIVOT PINS File d Dec. 26. 1929 4 Sheets-Sheet 1 John 0. #0171185 Ju 'ly.l' 4, 1 931 J. Q; HOLMES 1,814,250 Q MACHINE FOR MAKIIG PIVOT PINS 26.. 1929 4 Sheets-Shee 2 Filed Dec.

3W John Q. Holmes July 14,1931.

J. Q. HOLMES MACHINE FOR MAKING PIVOT PINS 4 Sheets-Sheet 5 Filed Dec. 26. 1929 3mm Jolm 6?. //o [mes July 14, 1931/. J. Q. HOLMES MACHINE FOR MAKING PIVOT PINS 4' Sheets-Sheet 4 Filed Dec. 26. 1929 Patented July 14, 1931 NETED STATES PATENT OFFICE JOHN G. HOLIVIES, OF ANDERSON, INDIANA, ASSIGNOR TO DELCO-REMY CORPORATION, OF ANDERSON, INDIANA, A CORPORATION OF DELAWARE MACHINE FOR MAKING PIVOT PINS Application filed. December 26, 1829. Serial No. 416,314.

This invention relates to the manufacture of machine elements such as pins used in the manufacture of hinge joints and the like.

One of the objects of the present invention is to provide a simple and durable machine which may be constructed at low cost for the manufacture of pins for hinges and pivot joints and the like from wire. This aim of the invention is accomplished by providing means for feeding wire to a work holder or device which clamps the free end portion of the wire in position while the end is being beveled or chamfered by a rotary cutter. The machine provides for cutting off the chamfered end portion of the wire and for automatically ejecting the completed pin from the work holder.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred embodiment of one form of the present invention is clearly shown.

In the drawings:

Fig. 1 is a perspective View of a portion of a punch press operated machine embodying the present invention showing the head of the punch press in upper position. I Fig. 2 is a fragmentary, perspective view showing the punch press head in downward position. v

Fig. 3 is a plan view partly in section of that portion of the mechanism which is mounted upon the bed of the punch press,

" the sectional View being taken on the line 3-3 of Fig. 6.

Fig. 4 is a plan view of the wire feeding mechanism.

Fig. 5 is a sectional viewon the line 55 of Fig. 3. a

Fig. 6 is a sectional view on the line 6-6 of Fig. 3.

Fig. 7 is a fragmentary section, the section being taken on the line 7 7 of Fig. 6.

Figs. 8 9,.and are sectional. views taken respectively on the lines 8-8, 99 and 10 10 of Fig. 6. v

The machine is mounted upon the base or bed'20 of a punch press and upon a supporting block 21 which is reciprocated by the cross head 22 of the punch press. The

.work holder clamp comprises a stationary jaw 30 attached by screws 31 to a block 32 resting upon the bed and secured thereto in any suitable manner as by bolts 33 shown in Fig. 1 and a movable'jaw 35 which is received by a recess 36 in a block 37 attached by screws 38 to the block 21 carried by the cross head 22. When the wire 15 is clamped between the jaws and the pressure is applied yieldingly by a spring 40 interposed between the block 21 and the jaw 35. This pressure is applied while the end portion of the wire is being out off along the section line 101O of Fig. 6. V

The cutting of the wire is effected by shear members, one of which is provided by the cutting edge 41 of the jaw 30 and 'the other by a movable shear block 42 attached by screws 43 to the block 21. During, the further downward movement of the head 22 after the free end of the wire 15 has been clamped between the jaws 30 and 35, the

shear block 42 is moved by'the head 22 below the cutting edge 41 of the block 21 in order to cut the wire 15 from the end portion 15A which is clamped between the jaws 30 and 35.

While the piece "15A remains clamped between the jaws 30 and 35 its free end is beveled at 15B as shown in Fig. 7 by a rotary cutter 5O havingblades 50a shown in Fig. 7 and attached to a holder 51 fixed to the end of a shaft 52. Shaft 52 is detachably connected with a power driven shaft 53 journalled in bearings 54 provided by a bracket 55 and driven by a pulley 56 having a belt connection57 with a power shaft (not shown). The bracket 55 is "reciproeated in the direction of the axis of the shaft by a mechanism operated by the punch 'tached t0 the bed 20.

press head 22. The bracket is guided for this movement by ways 58 and 59 at- The bracket is provided with a pair or" cars 60 supporting a rod 61 which receives a roller 62 received by a notched lever 63 extending into a notch 64 provided by the bracket 55. A spring 65 located between the block 32 and the lever 63 tends to move the lever counterclockwise and hence tends to move the bracket 55 toward the left. The lever 63 is moved in a. clockwise direction in order to move the cutter 50 against the work piece 15A by mechanism including a lever 66 keyed to a shaft '07 to which the lever-63 is attached. Shaft 6'? is supported by the bed 20 by bearing brackets, one of which is shown at 68 and which. is attached by screws 69 to the bed 20. The lever 66 carries-a roller 70 engaged by the head 71 of a rod 72 which X- tends through a guide 78 provided by the bed 20 and which carries at its upper end a screw 7% threadedly received by a hole tapped :in'the upper end ofthe rod 72. This screw His engaged by the block 21 carried by the press :head 22 for the purpose of causing the rod 72 to move downwardly when the head .22 moves downwardly in order to move the cutter 50 against the work piece 15A. Fig. 1 shows that there is lost motion between the block 21 and the head 'of-lthe'screw 74. If this lost motion is made :less by screwing lthescrew ""4: out of the rod 72, the travel of the cutter 50 toward the right will be increased, and will bedecreased ii" the screw l is screwed further into the ,rod '72. Screw 'Tstis'locked in adjusted position by lock nut 75. A light spring 76 located between the bed 20 and head 71 of the rod 72 tends to maintain the head 71 against the roller 1T0. lVhen the punch press head 22 returns to the position shown in Fig. 1 'the spring cam-n be permitted to expand and to move the brac'ket'55 toward the left so thatthe cutter 50 will be clear ofthe work piece 15A. This movement of the bracket 55 is permitted since the spring '65 is much stronger than the spring 7 6.

During upward movement of the press head 22 the cutter 50 moves toward the left from-the position shown in Fig. 2 to that shown in Fig. 1, so as to'clea-r a stop block 80 which will be moved upwardly by a spnigng 81 from the full line position shown in Fig. 0 to the dot-anchdash line position 80a. The stop block 80 is guided by recess 82 located between the clamp 30 and a spacor block 83 secured by a screw 83(4- to a square collar 85, attached to the block 32, and upward movement thereof is limitedby the lugs 85; of block 80 engaging said collar 1n the upper position, the block 80 serves as stop-f limiting nioreinentyof the wire 15 toward the left. 'The distance b t een the stop. $0 t e Shearing edge gravity.

41 of block 30 determines thelength of the piece 15A. The stop 80 is moved downwardly by two studs 86 attached to the block 37 and plate 21 in order that the block 80 will not interfere with movement of the cutter 50 into the position shown in Fig. 0.

In order to eject the wor niece 15A after the clamp 35 has been separated from the clamp 90 pivoted at 91 in Fin. 9 and received by a recess provided between the block-30 and the stop 80. Normally, this bar lies below the work 1521 shown in Fig. 6. Bar 90 is moved from the full line to the dot-anddash line position 00a shown in Fig. 9 for the purpose of tapping the work from the underside in order to cause it to be ejected from the clamp 80 so that it may roll backward and downwa dly into a suitable container (not shown). To facilitate removal of the work, the punch press is inclined with respect to the 'ertical as shown in Figs. 1 and T he ejecting movement of the bar 90 is e'llected automatically during a portion of the upward movement of the press head 22. The plate 21 carries a bar 94 having pivoted thereon a pawl 95 normally urged a'spring 96 against a triangular stop lug 9'! provided by the bar 9* Durmg downward movement of the head 22, the pawl 95 1 will move first against the curved surface 90' adjacent the freeend of the bar 90 so that the pawl 95 will be turned in a clockwise direction so as to clear the point of the bar 90; then the pawl 95 may return to the position shown in Fig. 9 in broken lines. During upward movement o1 'the bar 94 the pawl 95 will lift the bar 00 a oistance sufficient to cause the ejection of the work.

Since the bar 90 swings in a counterclockwise direction as viewed in Fig. 9 while the pawl 95 moves upwardly into the dotanrldash line position and still higher, the pawl will finally clear the ejecting bar so that it may return to normal position by The bar 9% is adj stably secured to the plate 21 by one or more screws 98 passing through slots 99 in the bar-9 L.

Referring to' Fig. 10, the wire 15 is clamped between the shear block 42 and a stripper block 100, during the shearing operation. the block 100 being yieldingly-urged upwardly by springs 101. The block 100 is guided by a recess 102 provided between the block 80 and a guide block 103 secured to the block 82. The block 100 is provided with lugs 104@ which by engaging the collar 85 limit the upward movement of the block 100, when the head moves upwardly, to a position such that the wire receiving groove 105 of the block 100 will be on a level with the wire receiving groove 106 of the clamp block 30. The guide block 103 isprovided with an oblong hole 107 slightly greater in width than-the diameter of the Wire 15. and sub- 30 there is provided an ejector bar.

stantially greater in height so as to permit movement of the wire from a position on the level. of the piece 15A to the lower position shown in Fig. 6 which the wire occupied at the end of a shearing stroke. The wire 15 is returned to an upper position so that'it 20 in any suitable manner and which supports shafts 111, 112 and 113 to which gears 114, 115 and 116 respectively are attached.

Gears 114 and 115 are connected by an idle gear 117 rotatably supported by the frame and gears and 116 are connected by an idle gear 118 also rotatably supported by the frame 110. Therefore, when the shaft 113 is rotated, the shafts 112 and 111 will likewise be rotated. The shafts 111 and 112 drive respectively wire straightening rolls 121 and 122 with which other straightening rolls 123, 124 and 125 cooperate to straighten the wire before passing between a feed roll 126 driven by the shaft 113 and pressed against said roller 126 by a roller 127 carried by frame 128 mounted on a shank 129 which passes through a suitable hole in the base 20 and is attached to a bar 130 having .holes 131 through which extend studs 132 which are threaded into the base 20 and which extend downwardly through springs 133, holes 134 in a bar 135 and which are threaded at their lower ends to receive nuts 136. By adjusting these nuts it is evident that the compression in the springs 133 may be adjusted in order to vary the pressure exerted by the roller 127 against the roller 126. The straightening rolls 123, 124 and 125 are also rotatably supported by the frame 110.

It is evident that if the feed roller 126 is rotated in a clockwise direction as viewed in Fig. 6, that the wire 15 will be fed toward the left against the stop 80. This motion'of the roller 126 is effected automatically during a portion of the upward movement of the press head 22. In order to accomplish this, there is journalled-upon the shaft 113 a bearing hub extending centrally through a gear 141, a spacer 142 and a ratchet pawl plate 143 shown more clearly in Fig. 3. These members are connected by a pin 144. The gear 141 meshes with a rack 145 which is guided for vertical move ment by bushing 146 attached to the base 20 and which provides a threaded portion 147 of reduced diameter extending through a hole 148 in the plate 21. The threaded eX- tension 147 receives nuts 149 which may be adjusted if necessary to provide lost motion between the block 21 and. the rack 145. The

purpose of the lost motion connection will be explainedlater.

The pawl plate 143 carries a pivot screw 150 pivotally supporting a ratchet pawl 151 adapted to engage a ratchet 152 attached to the shaft 113 by a key 153. The ratchet pawl 151 is yieldingly urged toward the ratchet 152 by a leaf spring 154 having its one end fixed to a pin 155 attached to the plate 143. It is apparent that during upward movement of the press head 22 the gear 141 will be rotated clockwise in order to move the pawl 151 in the same direction and the ratchet 152 in the same direction provided,

the point 151a of the pawl engages the teeth of the ratchet, a few of which are indicated vat 152a in Fig. 5. It will be noticed upon reference to Fig. 5 that the point 1510; of the 'pawl is held out of engagement with the ratchet teeth 1520; by an arcuate ledge or flange 156 which extends over into the plane of the ratchet 152 and which is integral with a disc 157 which may be adjustably secured by a screw 158 to the flange 159 of a bearing 160 which provides one of the bearings for the shaft 113. The bearing 160 is fixed in the frame 110. It is evident therefore, that the pawl point 151 must move in a clockwise direction until it is clear of the edge 156a of the ledge 156 before the pawl can be operated to drive the ratchet 152. By varying the angular adjustment of the disc 157 with respect to the bearing flange 159, the normal angular relation between the point 151a and the end edge 156a of the ledge 156 may be varied in order to change the amount of movement in a clockwise direction which must -take place before the pawl begins to drive the ratchet. In this way the angular distance through which the feed roll 126 moves may be varied in order to vary the distance through which the wire 15 is fed into the machine. If a longer hinge pin is desired the feed will need to be increased. For example, if a longer pin than shown at 15A in Fig. 6 is required, the ledge 156 should be adjusted in a counterclockwise direction from that shown in Fig. 5. A corresponding adjustment must be made with respect to the screw 74 in order todecrease the travel toward the right of the frame 55 which carries the rotatable cutter 50. As stated before, this adjustment is effected by screwing the screw 74 inwardly with respect to the rod 72. By

removing the collar 85 the stop block 80 may be removed and another substituted therefor so constructed and arranged to increase the distance between its stop surface and the shearing edge 41 of the shear block must be sufiicient to permit the shear block 42 to separate from the stripperblock 100 and the latter to move up to its uppermost position before the feeding of the wire begins. It is evident also that some variation in the amount of feeding of the wire may be effected by adjusting the nuts 149 along the threaded extension 147 of the rack 14:5.

Quite obviously, during downward movement of the press head the rack 1&5 will move downwardly but no feeding of the wire will occur since the pawl 151a will simply ride backward along the ratchet teeth without producing any motion.

\Vhile the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is tobe understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. Apparatus for making pivot pins, comprising in combination, astop member, means for feeding a rod against the stop member, means for clamping in fixed position a portion of the rod adjacent the stop, means for severing the portion clamped from the remainder of the rod, means for moving the stop away from the end of the rod so that the end will be exposed, and means for chamfering the exposed end of the rod.

2. Apparatus for making pivot pins, comprising in combination, a stop member, means for feeding a rod against the stop member, means for clamping in fixed positiona portion of the rod adjacent the stop, means for severing the portion clamped from the remainder of the rod, means for moving the stop away from the end of the rod so that the end will be exposed, means for chamfering the exposed end of the rod, and means for ejecting the work when the clamping means isreleasedQ 3. Apparatus for making pivot pins, comprising in combination, means for feeding a rod, means for chamfering the end of the rod and including a rotary cutter and a frame for supporting the cutter, means for moving the frame lengthwise of the rod, and means for severing the chamfered end portion of the rod from the remainder thereof.

4:. Apparatus for making pivot pins, comprising incombination, means for feeding a rod lengthwise a work holder comprising clamping jaws Ior gripping an end portion of the rod, means for chamfering the end of said portion, and means for severing said end portion from the remainder of the rod, said severing means comprising shear blocks, one of which is'provided by one of the clamping jaws 5. Apparatus for maklng pivot pins, comprising in combination, a base, an operating head. reciprocable'at right. angles to the base,

a work holder comprising a clamping jaw attached to the base and a clamping jaw attached to the head, feeding mechanism operated by the head for feeding the rod betool for chamfering the end of the portion 7 of the rod clamped between the jaws, and means operated by the head for moving the chamfering tool endwise against the end of the rod.

'6. Apparatus for making pivot pins, comprising in combination, a base, an operating head reciprocable at right angles to the base, a work holder comprising a clamping jaw attached to the base and a clamping jaw attached to the head, feeding mechanism operated by the head for feedingthe rod between the jaws of the work holder, means operated by the head for severing the portion clamped between the jaws from the remainder of the rod, a rotary chamfering tool for chamfering the end of the portion of the rod clamped between the jaws, means operated by the head for moving the chamfering tool endwise against the end of the rod, and means operated by the head for ejecting the chamfered portion from the work holder when the jaws are separated. I

7. Apparatus for making pivot pins, comprising in combination, a base, an operating head reciprocable at right angles to the base, a work holder including a jaw mounted on the base and a jaw mounted on the head, means mounted on the base and operated by the head for feeding a rod between the aws of the work holder, means for severing the I portion of the rod clamped between said jaws from the remainder of the rod and including a shear blade provided by the jaw which is mounted on the base and a shear blade attached to the head, a rotary chamfering tool engageable with the end of the rod clamped between the aws, a reciprocating frame mounted on the base for moving the chamfering tool endwise against the rod, and means operated by the head for moving the reciprocating frame.

8. Apparatus for making pivot pins, comprising in combination, a base, an operating head reciprocable at right angles to the base, a work holder comprising a jaw mounted on the base and a jaw mounted on the head, means mounted on the base and operated by the head for feeding a rod between the jaws of the work holder, means operated by the head for severing the portion clamped between the work holder jaws from the remainder of the rod, a stop member against which the rod is fed by the feeding means, means operated by the head for moving the stop member away from the end of the rod as the head moves toward the base in order to clamp the Work and to shear the portion clamped from the remainder, a rotary chamfering tool movable axially toward the head, a frame for supporting the chamfering tool for said axial movement, means operated by the head for moving the frame, and means operated by the head for ejecting the Work from the Work holder when the jaws are separated.

In testimony whereof I hereto affix my signature.

JOHN Q. HOLMES.

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