US2458598A

US2458598A - Machine for trimming shoe parts

Info

Publication number: US2458598A
Application number: US711239A
Authority: US
Inventors: Eric A Holmgren
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1946-11-21
Filing date: 1946-11-21
Publication date: 1949-01-11
Anticipated expiration: 1966-01-11

Description

Jan. 11, 1949. i E. A. HOLMGREN 2,458,598

MACHINE FOR TRIMMING SHOE PARTS Filed Nov. 21, 1946 2 Sheet s-Sheet 1 fizvenfor Eric A .HoZmgrerz B is ey Jan. 11, 1949. E. A. HOLMGREN 2,453,598

MACHINE FOR TR IMMING SHOE PARTS Filed Nov. 21, 1946 2 Sheets-Sheet 2 fizz/612101" 50 Erz'aAHo/m grew Patented Jan. 11, 1949 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to machines for trimrning shoe parts and is illustrated herein as embodied in a welt butting and tacking machine of the type disclosed in Letters Patent of the United States No. 2,045,577, granted on June 30, 1936, on an application of Benjamin B. Blanchard.

It is an object of the invention to provide machines of the aboveeidentified type with improved. trimming mechanism adapted to sever, with a clean cut, welt materials of all kinds including welts made of plastic materials which are notorie 0115 for their toughness and resistance to cutting.

in the accomplishment of this object, the illustrated machine is provided, in accordance with one feature of the invention, with a welt butting knife having two motions one being a motion of translation designed to carry the knife bodily into and out of operative relation to the welt to be butted, and the other being a resulting motion of the knife with relation to its carrrier and designed to cause the cutting edge of the knife to move in the general direction in which it extends so as to produce a draw cut. More specifically, in the illustrated embodiment of the invention the knife is disk shaped and mounted for rotation with relation to a reciprocating carrier. The reciprocation of the carrier serves to move the knife into and out of operative position with relation to the welt. There is a link connection between the rotary disk knife and the stationary machine frame, the link connection being so con.- structed and arranged that, during and as a result of the reciprocation of the knife carrier, the knife is rotated with relation to the carrier.

These and other features of the invention will now be described in detail in connection with the accompanying drawings and will be pointed out in the appended claims.

In the drawings,

Fig. 1 is a front elevation of a portion of a welt butting and tacking machine in which the invention is illustrated as embodied;

Fig. 2 is a side elevation of one of the welt butting knives of the machine illustrated in Fig. 1 and associated machine parts;

Fig. 3 is a side elevation (as Viewed from the line IIIIII of Fig. 1) of a knife operating mechanism, the parts being shown in their starting positions; and

i 4 i a bottom lan s iewed irm; has

Ill-IV oi g.- 8 of th knife peratihg mecha nism.

T e in en icn is illustrat s mbod ed i s machine of the type disclosed in the above-mentioned patent and also in Unit-ed States Letters Patent No. 1,709,347, granted on April 16, 1929, on an application of George Goddu and Fred L. MacKenz ie, and, accordingly, only such features of the general organization as it is necessary to refer to for an understanding of the invention will be described hereinin detail.

As illustrated in Fig, 1 the machine has two s e up o n memb r 3 a d a bash to l2 an ed to ake the ewest the cuttin s o e f w w u ng ni es I 4 ar an ed is srats a opposite sides at he su ported hip a e ci t o the. h el b east s.- v the shoe to be operated upon spositioned heights ise. of thsmashin by a helddewn member lhe we t iF sv2 v a sa h si ea t sho i u q sd or t e b tt n o er t n b a eas finder (Fi 1,) anvil '9 ands We sup ort 22. These members to ether with the knives i l a air of askin u ts 2 re m u in a pair o wi in am s '26 fu crumed i t ma? chine am is s ine ahsu e ical e in d ections extending 'widthwis'e of the shoe.

Each welt butting knife Ill-is in the form of a disk of irregular shape, as illustrated best in Fig. has a c r u ar cutt ng e e s men to a hub portionpf the knife about the axis of which the knife may he rotated, as will be described.

o cause th kn e t se er t e bu end 9 the welt with a draw out as centrasted with the chop.- ping cut typical of welt butting knives used here: tofore in a hi of the l ust ated t e, ea h knif is of e i l trated .m sh he ha a mo e ment of translation, as usual, but in addition thereto has a concomitant movement of retaw tisn- T0 om li h thi th sllswins mesh nism for supporting and operating the knife i4 is ov e i h me u de od that t e i l-usate m chi e s e u pp d ith wo such ni s p o t a d o ating me h nisms d that a descripti n I o y 9 s f them w ll uflise- As in the machines disclosed in the .above-m-e ntioned patents, there is provided a main slide 28 (Figs 3 an s fer suppsr ins a d acatin th we t b i g nife: Moun e on the main s de 28 for me t th r lat sh. thereto. a d at an an e to t di e t on o -movement of that slide is a knife carrying slide 30 the forward end of c is o ded at it lswer qr enwith a era l sxtehslie flange Fish,- Cut o h b om has cf the erwars 19i the knife arry ng sl de .39 z hel iihs the. f an e his a e s 34 llt tra sd has In Fisa t e recesshe hs The h l sea 0 v covered or bridged over by a bottom plate 36 secured by screws to the bottom face of the forward end of the slide 30. The bottom plate 35 has a bore to accommodate the hub of the knife I4, the hub abutting the lower face of one end portion of a link 38 located in the recess 34 and provided with a bore in alinement with the bore in the bottom plate 36 and a bore in the upper portion of the flange 32 above the recess 34.

The hub of the knife I4 is hollow and the knife I4 is countersunk in alinement with the hollow hub to accommodate a clamping screw 48 which passes through the hub of the knife I4, the bores in the bottom plate 36, the link 38 and the upper portion of the flange 32, thus mounting the knife in place, the knife being held in clamped position by a locknut 42 threaded on the end portion of the clamping screw 40 extending upwardly from the upper face of the flange 32. Thus the knife I4 and the link 38 are rigidly clamped together by the screw 48' and locknut 42, the head of the screw resting in the countersunk portion of the knife. As will be presently described, the link 38 may be rotated, thus causing a rotation of the knife I4 with relation to its carrier slide 30. To this end, the extremity of the link 38 remote from that to which the knife is clamped is apertured to surround a vertical stem 44 (Figs. 1 and 4) held in a yoke shaped arm 46 pivotally secured to a bracket 48 fixed K in a casting 50 which is part of the machine frame. Thus the link 38, by sliding on the stem 44, can participate in the vertical movements of the knife I4, to be described, and can swing about the axis of the stem 44.

Referring more specifically to the knife carrying slide 30 and its movement with relation to the main slide 28, it will be noted that, as in the machines disclosed in the above mentioned patents, the main slide is provided with an inclined guideway 52 (Fig. 3) along which the knife carrying slide 30 is movable with relation to the slide 28. On movement of the knife carrying slide 30 with relation to the slide 28 the knife I4 is moved heightwise of the machine to carry it into the plane of its cutting operation or to move it out of that plane at the end of a cutting operation. To this end, the slide 38 has a lug 54 (Fig. 3) which is pivotally connected by means of a link 56 to a rotary member 58 secured to a shaft 50 mounted for rotation in the machine frame and provided with a brake mechanism (not shown here but disclosed in said patents. The brake mechanism tends to resist rotation of the shaft 60 and thus tends to resist movement of the slide 30 on movement of the slide 28. As illustrated in Fig. 3, the slide 30 is provided with an abutment 62 adapted to cooperate with a stop 64 provided on the slide 28. Moreover, the slide 28 carries a stop screw 66 the head portion of which extends into a slot 68 provided in the slide 38. As fully disclosed in the above-mentioned patents the illustrated machine is provided with mechanism for reciprocating the slide 28 in the machine frame.

As a result of the just described arrangement and on movement of the slide 28 in the direction of the arrow illustrated in Fig. 4, movement of the slide 30 with and in the same direction as the slide 28 is resisted by the described connection of the slide 30 with the shaft 68. As a result, the knife carrying slide 30 is lowered substantially vertically along the guideway 52, and thus the knife I4 is lowered into the plane of its cutting operation, this movement of the knife being permitted by the link 38 sliding down on the stem 44. As soon as the abutment 62 engages the stop 64 the downward movement of the slide 30 ceases, the slide 30 then being moved along with the slide 28 and overcoming the resistance of the brake mechanism acting on the shaft 68. Thus, the knife I4 is moved in its plane of operation toward the supported welt and the anvil 20 with which the knife I4 cooperates in skiving off the rear end of the welt. By reason of the fact that the knife I4 is clamped to the link 38 which in turn is pivotally secured by means of the yoke shaped arm 46 to the fixed bracket 48, the knife I4, as a result of and during the just described movement of translation, is rotated about the center of its hub while the link 38 is swung from the position indicated in full lines in Fig. 4 to the phantom position indicated in the same figure. Accordingly, there is imparted to the knife, in addition to its motion of translation, a separate motion of rotation as a resut of which the cutting edge of the knife is moved, so to speak, in the direction in which it extends. Therefore, when the knife engages the welt w (Fig. 2) the welt is severed by a draw out in that the knife I4 when being moved across the end of the welt is rotated. Reverse movement of the main slide 28 at the end of the welt butting operation causes at first a relative movement between the

slides

28 and 38 in that the slide 38 is merely raised along the guideway 52 since its movement with the slide 28 is again resisted by reason of the connection of the slide 38 to the shaft 60. The upward movement of the slide 38 ends when the screw 56 abuts one end of the slot 68, the knife again having been raised to its inoperative upper position. Continued movement of the main slide 28 toward the right of Figs. 3 and 4 then produces movement of the knife carrying slide 30 in the same direction as a result of which the link 38 and the knife I4 are again returned to their initial positions illustrated in Fig, 4. It will be seen therefore, that the knife has a four-way motion and that during its horizontal travel it is rotated about its own axis of rotation with the results described.

As illustrated best in Fig. 2 and as fully disclosed in the above-mentioned patents the knife carrying slide 30 is provided with a presser foot I0 mounted on a stem I2 movable in a passageway provided in the slide 38. The presser foot I8 is adapted to engage the work just ahead of the knife and to cooperate with the knife during its cutting operation in a manner well known in the art.

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

1. In a machine for operating on shoe parts, a fixed frame, a trimming knife, a movable carrier on which the knife is mounted for movement with relation thereto, means for actuating the carrier to impart to the knife a motion of translation along a predetermined path, and means connecting the knife to the frame and active as a result of the movement of translation of the knife to cause the knife to move with relation to the carrier without deviating from said predetermined path.

2. In a machine for operating on shoe parts, a fixed frame, a trimming knife, a reciprocating carrier on which the knife is mounted for rotation with relation thereto, means for reciprocating the carrier to move the knife bodily along a predetermined path, and means connecting the s knife to the frame and adapted to rotate the knife on reciprocation of the carrier.

3. In a machine for operating on shoe parts, a fixed frame, a disk shaped trimming knife having a rotary hub, a reciprocating carrier on which the knife is mounted for rotation with relation thereto, means for reciprocating the carrier to move the knife bodily along a predetermined path, and a link connection between the hub of the knife and the frame, the connection being active as a result of the reciprocation of the carrier to rotate the knife while it moves along said predetermined path.

ERIC A. HOLMGREN.

REFERENCES CITED The following references are of record in th file of this patent:

UNITED STATES PATENTS