US2214840A - Fastening pulling machine - Google Patents

Description

Sept. 17, 1940. A. R. scHoENKv FASTENING PULING MACHINE Filed Nov. 13; '1939 Patented Sept. 17, 1940 UNITED STAT'ES FASTENING PULLING MACHINEl August R. Schoenky, Swampscott, Mass., assignor to United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation of New Jersey Application November 13, 1939, Serial No. 303,997

6 Olaims.

This invention relates to fastening pulling machines and is heren illustrated as embodied in a machine for pulling lasting tacks from shoes.

Inv the manufacture of some types of shoes,

fastenings, such as tacks, are commonly used for temporarily securing the upper of a shoe to the last. Usually these tacks are later removed by tack pulling machinesl which commonly comprise a tool oscillated continuously at high speed. In one method of lasting shoes, the toe portion of the shoe upper is drawn tightly over the last and held in position by a Wire extending about the toe portion and holding the upper against a rib on the insole, the Wire being secured in place by tacks driven through the lasted over margin of the upper and the insole and into the last with the heads of the tacks bearing down on the Wire or with the wire twisted about the shanks of the tacks. Difliculty has been experienced in pulling such tacks by machines heretofore constructed, lby reason of. the fact that the deeply driven tacks cannot be readily positioned in engagernent with the tool without likelihood of damaging finished portions of the shoe upper adjacent to the| tacks.

Accordingly, it is an object of the present invention to provide an improved fastening pulling machine which will facilitate the rapid location of fastenings relatively to a tool and the removal of the fastenings from the shoe without injury thereto.

To this end, and as illustrated, I have provided an improved fastening pulling machine in which there is a fastening pulling tool, which is normally stationary and is so arranged that a fastening can be readily located in pulling position in engagement with the tool, andl mechanism operable subsequently to cause a pulling movement of the tool.

These and other features of the invention will be apparent from the following specification when taken in connection with the accompanying drawing and are pointed out in the claims.

The drawing shows a view in side elevation of the head of a fastening pulling machine embodying my invention.

The illustrated machine is especially adapted to pull deeply embedded fastenings, such as' lasting tacks IO, driven into the bottom of a lasted 50 shoe |2 temporarily to secure a toe Wire |4 in position to hold the lasted over margin of the upper |6 of the shoe tightly against a rib' |8 on an insole |9.

The machine comprises a frame 20 carrying a work rest 22 in the form of a button against which the bottom of the shoe l2 canbe located with one of the tacks IO therein in operative relation to a claw or chisel-like tack pulling. tool 24 which is arranged to be actuated by mechanism, presently to be described, to pull the tack.

The work rest 22 is carried by a shank 26, extending through a bracket 28 secured to the upper portion of the frame 20, and having screw threads 30 by which the work rest can be adjusted heightwise of the tool 24. The bracket 28 is preferably secured to the frame by screws 32 extending through an elongated slot 34 by means of which the bracket can be adjusted laterally on the machine to locate the work rest 22 in desired position outwardly of the tool 24.

The tool 24 is secured to a tack puller lever 36 which is mounted on a pivot 38 and is normally forced by a spring 40 against an abutment in the form of a plate 42 which contacts the under side of the lever 36 to hold the lever stationary, with the tool in predetermined position heightwise of the work rest 22. This position of the tool can `readily be adjusted by-Varying the height of the plate which is held in adjusted position by a screw 44 extending through a slot 46 in the plate.

This construction is such that the tool is normally at rest with the under side of the tack puller lever 36 in engagement with the upper edge of the plate 42. With the tool stationary, a shoe can readily be moved into positionin engagement with the work rest 22 such that the head of a tack is in engagement with the tool ready for the pulling of' the taok.

The tool 24, in its tack pulling movements, is actuated by a plunger 48 arranged to be forced against a leather 'buffer 50, on the under side of the tack puller lever 36, by a spring 5| which is normally held in compressed condition by a control lever 52. The control lever 52 is mounted up on a pivot 54 and has a free end 56 carrying a roll 58 which enters a recess 60 in the side of the plunger and engages the lower wall of the recess to hold the Dlunger in retracted position with the spring 5| compressed.

The plunger 48 is withdrawn to its inoperative or retracted position by a lever 62 pivoted at 64 on the frame and having at its outer end a flat surface 65 arranged to engage a roll 66 on the plunger toeffect a downward movement of the plunger during operation of a cam 68,

which engages a roll 10 carried by a tail 12 of' the lever 62.

In order to release the lplunger to effect operation of the tool 24, I have provided manually actuated mechanism which will now be described. The control lever 52 has an outer portion 14 to whichI is connected a spring 16 normally operative to rotate the lever 52 in a direction to force the roll 58 into engagement with the plunger 48. The outer portion 14 carries a pin 18 arranged to be engaged by a pawl pivotally mounted upon the upper end of a treadle rod 82, there being Va spring 84 for forcing the pawl Bll: in a direction toengage the pin 18. When the 'treadle rod 82 is depressed, the pawl acting upon the pin 18 rotates the control lever 52 in a clockwise direction moving the roll 58 out of the recess 66, thusV releasing the spring 5| which drives the plunger upwardly into engagement with the tack puller lever SEE, thereby effecting a rapid movement of the tool 24 in a heightwise direction to remove the tack lll. Upward movement of the tack puller lever 36 is limited by a buffer 86 securedV to the upper portion of the frame lO.

Further movement of the pawl 86, after the lever 52 has moved sufiiciently to release the spring 51, causes the end of the pawl to engage a stop 88 which pushes the pawl off the pin 18, thus disconnecting the treadle rod from the control lever and permitting the return of the lever 56 to its stop position by means of the spring '56. This prevents a second operation of the plunger 4B until the treadle rod is released and returned to its original position by a spring or other suitable means, not shown.

Mechanism is provided to prevent tripping of the control lever 52 during such time as the surface of the lever 62 is in the path of movement ofthe roll 66 on the plunger 48. This mechanism comprises a latch 96 pivoted at 92 on the frame and arranged to engage a pin 94 on the control lever 52, there being a spring 95 normally operative to force the latch against the pin. The latch is arranged to be released at the proper time by a rod 96 having its lower end pivoted at 98 on thev latch, and its upper end eX- tending loosely through a lug lll carried at the free end of the lever 62. During downward movement of the free end of the lever 62 in loading the spring 5|, the end of that lever moves along the rool 96 without releasing the latch 90 but, near the completion of the return or upward movement of the end of the lever 62 the latter engages a nut m2 on the end of the rod 96 and moves the rod in a direction to pull the latch off the pin, thus rendering 'the control lever 52 operable upon depression of the treadle rod.

In the operation of the machine, a shoe, such as the shoe l2, is presented bottom-up to the work rest 22, and the shoe is moved along the rest to present one of the tacks lll to the end of the tool 2l, which at this time is stationary, thus facilitating the location. of the taclr. in pulling position. The operator then. depresses the treadle rod 82, rotating the control lever 52 in a clockwise direction to remove the roll 58 from the recess 66 in the plunger fit, thus permitting the spring 51 to force the plunger upwardly into engagement with the lever 36 delivering thereto a sharp b-low which will effect a pulling movement of the tack pulling tool tli. After the tack is pulled, the cam 68 causes the lever 62 to retract the plunger lll and the spring lii rotates the control lever in a countercloclfwise direction, moving the roll 58 into the recess 6B, thereby looking the plunger in retracted position. The spring 40 rotates the lever 36 until the latter engages the abutment fill and the tack pulling tool is again in stationary position ready to operate on another tack. If the treadle B2 is depressed at a time when the end of the lever 62 is in the path of the plunger (58, operation of the control lever is prevented by the latch 90 which is moved into inoperative position by the rod 96 only after the cam 68 has moved the lever 62 out of the path of the roll 66 and the plunger.

I-Iaving described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A fastening pulling machine comprising a normally stationary fastening pulling tool mounted for heightwise movement, a spring pressed plunger constructed and arranged to effect operation of the pulling tool, power operated means for retracting the plunger, a control member normally operative to lock the plunger in rctracted position, and means for causing the control member to release the plunger.

2. A fastening pulling machine comprising a work rest, a fastening pulling tool movable heightwise of the work rest, a plunger constructed and arranged to actuate the fastening pulling tool, a spring for urging the plungerV in a direction to actuate the tool, means for retracting the plunger, a control member normally operative to maintain the plunger in retracted position, and man'ually operated means for causing the control member to release the plunger.

3. A fastening pulling machine comprising a Work rest, a fastening pulling tool movable heightwise of the work rest, a spring pressed plunger for moving the tool to effect a fastening pulling operation, cam operated means for retracting the plunger, a control lever normally operative to hold the plunger in retracted position, manually operable means for actuating the control lever to release the plunger, and a latch for preventing operation of the control lever while the retracting means is in operation.

4. A fastening pulling machine comprising a work rest, a fastening pulling tool mounted for movement heightwise of the work rest, a spring pressed plunger for actuating the tool, a lever for retracting the plunger, a control member constructed and arranged to engage the plunger normally to hold the plunger in retracted position, means to move the control member to disengage the same from the plunger, a latch normally operative to prevent disengagement of the control member, and a connection between the latch and the lever to releaselthe latch subscquently to the retraction of the plunger.

5. A fastening pulling machine comprising a frame, a work rest carried by the frame, a lever pivotally mounted on the frame, a fastening pulling tool carried by the lever, anVabutm-ent on the frame, a spring normally operative to force the lever into engagement with the abutment to position the lever with the tool stationary in normally operative to forcethe carrier against i the abutment to hold the tool stationary, and mechanism for moving the carrier in a direction away from the abutment to effect a fastening pulling movement of the tool.`

AUGUST R. SCHOENKY.

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