US2020433A - Method of and machine for operating upon shoe parts - Google Patents

Description

' Nov. 12, v1935.

wf R. PRATT A 2,020,433

.METHOD OF AND MACHINE FOR OPERATING UPON SHOE PARTS Filed-F'eb. 23, 1934 @Vf/WUR Y* MM ,i /5 T1317. 9 gg- Patented Nov. 12, 1935 UNITED STATES ZAS METHOD OF AND MACHINE FOR OPERAT- ING UPON SHOEl PARTS William R. Pratt, Marlboro,rMass., assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Application February 23, 1934, Serial No. 712,444 15 claims. (cl. 12J-55) This invention relates to methods of and machines for nishing the edges of shoe parts and is herein illustrated as embodied in a machine in which an intensely hot tool is employed to treat the edge of a piece of upper leather.

A machine of this general type .is shown in United States Letters Patent No. 1,464,504, granted August 14, 1923, upon an application filed in the name of Joseph Fossa. In such machines, the work, as` it is fed, encounters a plow which turnsy up the edge while the margin on one side of the work along said edge and a corner of said edge are seared and shrunk by an intensely hot tool against the bottonr and side of which the margin and edge of the work are y held by the work support'and the plow. The re- .,sult of this'treatment is that the unshrunken side of the margin of the work eurlstoward the shrunken side, and a small upstanding nn is formed between the plow and the adjacent side of the tool. This fin is bent over toward or upon l the body portion of the work by a hammer beneath which the edge of the work passes as it leaves the plow and shrinking tool, saidhammer oscillating in a path which is transverse to the direction of feed movement of the work and acting to increase the curl of the upstanding 1in and to press the n down upon the body portion of the work.

The fin which forms the upturned edge of the work as it leaves the plow and shrinking tool is substantially vertical, and consequently the hammer is so constructed and oscillated that its operative face strikes this n a blow which is directed from above on one side of the fin oblique- `ly downward toward the body portion of the work, the purpose of this construction being to bend the n inwardly over said body portion. It sometimes happens, however, that a portion of the fin is bent down in the opposite direction, in which case the smooth, rounded edge which is desired on the finished piece of work is not uniformly produced.

In order to insure that Ythe n or upstanding edge of the work shall always be bent properly over the body portionof the work, there is p-rovided, inaccordance with the present invention,

- a hammer having two work-engaging faces ar- 1 rangedat an angle to each other and located one in front of the other considered in the direction of feed movement of the work, whereby succeeding portions of the edge of the work are engaged by them, one face acting to bend the Y upstanding edge of the work partially into place over or upon a body portion of the work and the viously bent-down portion is being pressed.

other face acting, when this part of the edge is Vsubsequently fed beneath it to complete the operation. In the illustrated construction, there is provided, i-n that end of the hammer which is adjacent to the plow and shrinking tool and V5 which faces the oncoming Work, a recess which extends in the general direction of feed movement of the work, a work-engaging wall of said recess being inclined at such an angle that the 1in must be bent over toward the body portion 1o f of the work. Then, as the part of the edge which was thus acted upon by the wall of the recess is fed along farther, the remaining portion of the hammer descends upon it to complete the operation. Thus the hammer at each stroke l5 acts simultaneously upon two adjacent portions of the edge of the work. The wall of the recess acts upon the upstanding iin at one portion of the edge to bend it partially into place and at the same time theremaining portion of the ham- 20 mer acts to complete the operation upon the fin in another locality which had been previously operated upon by the wall of the recess.

The invention also provides a method which consists in shrinking one side of a piece of work 25 along an edge thereof to produce an upstanding fin and bending down and pressing the fm in two steps carried out in such manner that while one portion of the n is being bent down a pre- Referring now to the accompanying drawing, Fig. l'is a perspective of a hammer of an edge- Vfinishing machine by which the method of the invention may be conveniently practiced,

Fig. 2 -is a plan View of the work-engaging parts of the machine.

Figj3 is a section on the line III-III of Fig. 2 showing more particularly how, when the hammer f descends, the wall of the recess in the hammer will engage the upstanding edge or nn of the 40 work, Y

Fig. 4 is a section similar to thatV of Fig. 3 and r with the shrinking tool omitted showing the wall in the recess of thehammer in the process of bending the iin toward the body portion of the work,

Fig. 5 is a section similar to that of Fig. 4 but showing the hammer at the end of its stroke,

Fig. 6 is a section like that of Fig. 5, except that rthe workV is sectioned on a plane which passes through the shallow end of the recess in the face of the hammer, and Fig. '7 is a section on the line VII-VII of Fig. 2

showing the nal Vappearance of the work after the portion of the edge of the work which is shown in Figs. 3, 4 and 5 has been fed beneath the plain face of the hammer which is located beyond the recess.

The machine, except for the Work-engaging portion of the hammer, is or may be the same as that of the machine of the patent referred to above. The work |00 is fed away from the observer (Fig. 3) by cooperating feed members 9 and the lower member 9 moving back and forth in the line of feed and the upper member Si having a four-motion feed movement. As the work is fed intermittently, its edge is bent up by a plow l5 and held against the bottom and side faces of a shrinking tool Vwhich acts to sear and shrink the margin of the work on one side. There is thus produced on the work a thin upstanding edge or iin. Directly behind the piow is a hammer |55 (Fig. 2) which engages the rln as it passes from between the plow and the shrinking tool and bends it over toward or upon the work. In order to produce a smooth unbroken edge on the finished work, it is desirable that the fin be progressively bent over the body portion of the work without at any time being bent in the opposite direction or crushed down vertically and that the hammer strike a yielding blow so as to provide for pieces of work of different thicknesses. To this end, the hammer is swung down by mechanism including a spring 2| about the axis :c so that its operative face strikes .a yielding blow directed obliquely downward toward the body portion of the work. The mechanisms for operating the feed members and the hammer and for raising the shrinking tool to a high temperature will not be described since their details of construction form no part of the present invention and any suitable edging machine may be employed.

It sometimes happens, particularly with certain kinds of leather, that the upstanding edge or iin is not bent uniformly over the body portion of the work at all localities; and the present invention provides a hammer having work-engaging faces which act in succession as the work is fed first to bend the fin partially over into place and then, as the work is fed farther, to act upon the partially laid-over n to complete the operation. In the illustrated construction these work-engaging faces are formed on a single member, namely on a small hardened plate 23 which is fastened to the head of the hammer by a small screw 25 and forms part of said head. k'I'his head has two ends, an end 21 which faces the oncoming Work |90 and an end 29 which faces the receding work. In the end 27, which faces the oncoming work, there is formed a recess 3| which, in the illustrated construction, decreases in width and in depth from the end 21 toward the end 29 of the head of the hammer,-that is, it decreases in the direction of feed movement of the work. Beyond or forward of the recess 3|, considered in the direction of feed movement of the work, the hammer has a work-engaging face 33 which is plain or substantially so, being herein shown as provided with small grooves extending thereacross in the direction of feed movement.

Referring to Fig. 4, it will be seen that, as the work is fed through the machine, any given point -on the upstanding fin will first be engaged in the manner shown in that figure by the right-hand wall of the recess 3| while the hammer head is moved obliquely downward from upper right to lower left and will be bent over by the deeper portion of the recess 3| into some such position as that shown in Fig. 5. At the same time a portion of the edge of the work in advance of that portion shown in Figs. 4 and 5 will be bent further over into some such position as that shown in Fig. 6, it being understood that the length of the intermittent feed movements imparted to the work is less than the length of the recess 3|, the particular point to be noticed being that the upstanding fin is engaged in such manner that it must bend over the work and that it can neither be bent in the opposite direction nor crushed straight down. The hammer now rises and the work is fed forward, whereupon the flat face 33 of the hammer in its next, or in a subsequent descent, pounds the fin down into the position shown in Fig. '7. It should be understood that the height of the upstanding fin is actually very small, being commonly in the neighborhood of of an inch, .and that its height has been exaggerated in the drawing in order to show more clearly the operation of the hammer.

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

l. A machine for finishing the edge of a piece of work having, in combination, work-feeding means, and a shrinking tool and a hammer located side by side with the hammer in the rear of the tool when viewed in the direction of feed -movement of the work, said hammer having formed in the end adjacent to the tool and extending into its work-engaging face a recess.

2. A machine for finishing the edge of a piece of work having, in combination, work-feeding means, and a shrinking tool and a hammerlocated side by side with the hammer in the rear of the tool when viewed in the direction of feed movement of the work, said hammer having formed in the end adjacent to the tool and extending into its Work-engaging face a recess which decreases in width from the end of the hammer adjacent to the tool toward the other end of the hammer.

3. A machine for finishing the edge of a piece of work having, in combination, work-feeding means, and a shrinking tool and a hammer located side by side with the hammer in the rear of the tool when viewed in the direction of feed movement of the work, said hammer having formedl in the end adjacent to the tool and extending into its work-engaging face a recess which decreases in depth from the end of the hammer adjacent to the tool toward the other end of the hammer.

4. A machine for finishing the edge of a piece of' work having, in combination, work-feeding formed in the end adjacent to the tool and extending into its work-engaging face a recess which decreases in width and depth from the end of the hammer adjacent to the tool toward the other end of the hammer.

5. A machine for finishing the edge of a piece of work having, in combination, means for feeding the work, means for shrinking the margin thereof to produce an upstanding rin, and a hammer for operating upon said fin, said hammer having in that end which faces the oncoming work a recess to receive the fin, one wall of said recess acting to bend successive portions of the iin over toward the body portion of the work.

6. A machine for nishing the edge of a piece of work having, in combination, means for feeding the Work, means for shrinking the margin thereof to produce an upstanding fin, and a hammer for operating upon said 1in, said hammer having in that end which faces the oncoming Work a recess to receive the finone wall of said recess acting to bend successive portions of the fin over toward the body portion of the work, the remaining portion of the hammer acting to press these laid-over portions when they have been fed beneath it. Y

7. A hammer for progressively operating upon the bent-up edge of a piece of work fed past it, said hammer comprising two work-engaging faces arranged at an angle to each other andv located one infront of the other considered in the direction of feed movement of the Work whereby successive portions of the edge Vof the Work are engaged successively by them, one face acting to bend the upturned edge of the work partially into place over the body portion Vof the work, and the other face acting subsequently to complete the operation.

8. A hammer for progressively operating upon the bent-up edge'of a piece of work fed past it, said hammer having in that part of its Work-engaging face past which the successive portions of the bent-up Yedge are first fed a recess which extends in the general direction of feed movev ment of the Work and also having an unrecessed portion forward of said recess to Contact later with the saine successive portions.

9. A hammer for progressively operating upon the bent-up edge of a piece of work fed past it, Ysaid hammer having in that part of its workengaging face past Which the successive portions of the bent-up edge are first fed a recess which extends in the general direction of feed movement of the work, the depth of said recess, measured in the line of approach of the hammer face to the Work, decreasing in the direction of feed movement of the Work.

10. A hammer for progressively operating upon the bent-upl edge of a piece of Work fedV past it, said hammer having in that part of its work-engaging face past which the successive portions of the bent-up edge are first fed a recess which extends in the general direction of feed movement of the work, the width and depth of said recess decreasing in the direction of feed movement of the work.

11. A hammer for progressively operating upon the bent-up edge of a piece of work fed past it, said hammer having in that part of its Work-engaging face past which the successive portions of the bent-up edge are first-fed a recess which extends in the general direction of feed movement of the Work, the portion of the workengaging face of the hammer forward of the recess being substantially plain. I

12. A hammer for progressively operating upon the bent-up edge of a piece of work fed past it, said hammer having in that part of its vworkengaging face past Which the successive portions of the bent-up edge are rst fed a recess which extends in the general direction of feed movement of the Work, the Width of Said recess decreasing in the direction of feed movement of the work, the portion of the work-engaging face of the hammer forward of the recess being substantially plain.

13. A hammer for progressively operating upon the bent-up edge of a piece of Work fed past it, said hammer having in that part of its Work-engaging face past which the successive portions of the bent-up edge are first fed a recess which extends in the general direction of feed movement of the work, the Width and depth of said recess decreasing in the direction of feed movement of the work, the portion of the work-engaging face of the hammer forward of the recess being substantially plain.

Y 14. A hammer for progressively operating upon the upturned edge of .a piece of Work fed past it, said hammer being provided in that end toward which the work is fed with a recess a wall of which engages Vand bends down a portion of the upturned edge and having a face located forward of the recess, `considered in the direction of feed movement of the work, adapted when the bent-down portion of the edge is fed beneath it, to strike said bent-down portion.

15. The method of nishing the edge of a piece of work which comprises shrinking and searing one side of the piece along an edge thereof to cause the unshrunken side to curl toward the shrunken side in such manner as to produce a thin upturned iin, 'and bending down and pressing said fin into contact With the body portion of the work in two steps carried out in such manner that while one portion of the upturned n is being bent down, a previously bent-down portion is being pressed.

WILLIAM R. PRATT.

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