US2582975A

US2582975A - Shoe toe lining trimming machine

Info

Publication number: US2582975A
Application number: US169188A
Authority: US
Inventors: John M Ewart; Lester S Macdonald
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1950-06-20
Filing date: 1950-06-20
Publication date: 1952-01-22
Anticipated expiration: 1969-01-22

Description

Jan. 22, 1952 J. M. EwARr ETAL SHOE TOE LINING TRIMMING MACHINE 7 Sheets-Sheet l Filed June 20, 1950 w Invenars John/Ewar Les r 5. Nacdo 770/0 Jan. 22, 1952 M EWART ErAL 2,582,975

SHOE TOE LINING TRIMMING MACHINE Filed June 20, 1950 7 Sheets-Sheet 2 Jan- 22. 1952 J. M. EWART Erm. 2,582,975

sHoE Tos LINING TRIMMING MACHINE med June 2o, 195o l v sheets-sheet s Inventors Les fer 6. /Vacdona/a By /:eir Attorney Jan. 22, 1952 1 M EWART ErAL 2,582,975V

SHOE TOE LINING TRIMMING MACHINE I Filed June 20, 1950 7 Sheets-Sheet 4 Inventors Ifo/m N. .Ewclr Leser 5. Macdona/o By #1e/r /tor'ney Jan. 22, 1952 J. M. EwART ETAL SHOE TOE LINING TRIMMING MACHINE 7 Sheets-Sheet 5 Filed June 20. 1950 fnvenors John M 1-warf '7 Sheets-Sheet 6 J. M. EWART' ETAL SHOE TOE LINING TRIMMING MACHINE Jan. 22, 1952 Fiied June 2o, 195o 7 Sheets-Sheet 7 Jan. 22, 1952 J. M. EwART ErAL sHoE Tora LINING TRIMMING MACHINE Filed June 20, 1950 In 'uen fors Ifo/m /7. warI Patented Jan. 22, -1952 SHOE TOE LINING TRIMIIING MACHINE John M. Ewart and Lester S. Macdonald, Beverly, Mass., assignors to United Shoe Machinery Corporation, Flemington, N. J., a corporation oi' New Jersey Application June 20, 1950, Serial No. 169,188

9 Claims.

'Ihis invention relates to machines for trimming the lasting margin of the lining at the toe end of a partially fabricated shoe, an operation usually performed after the sides of the shoe have been lasted and in preparation for the lasting of the toe portion. A trimming machine embodying the present invention is accordingly to be used on shoes of the McKay or other types in which the lasting margins at the toe, after satisfying pulling-over requirements, need to be reduced in width and bulk.

Trimming of these toe margins eliminates a fabric surplus which, if not severed properly, would be unevenly distributed and creased during toe lasting to prevent securing the smooth and neatly finished appearance that is desired. Generally the plane of the trimming is preferably spaced heightwise of the plane of the toe of the insole by approximately the thickness of the upper. In addition to leaving a rather uniform margin by means of clean cutting, it is important that the trimming band extend rearwardly nearly to the endmost side lasting fastenings so as to avoid producing folds which would bulge in those areas of the finished shoe.

The outer layer of shoe material at the toe end, commonly of upper leather, will hereinafter be referred to as upper, and the term lining" will, for convenience, be used to refer collectively to the layers backing the upper, these layers citen including what is normally termed lining plus the intermediate doubler and stii box toe.

It is an object of the present invention to provide an improved trimming machine for rapidly performing the described severing in an entirely satisfactory manner on a partially fabricated shoe in bottom-down position, which machine shall be of relatively simple construction and easily operable.

To the accomplishment of this objective, and in accordance with one feature of the invention, there are provided means for clamping the strip of lining to be trimmed, a member engageable with the bottom of the shoe to support its toe portion, and a cutter carriage having a fulcrum cooperative with said member whereby the shoe may be rocked heightwise of said means to tension the upper and lining against the toe portion of the last while the trimming knife severs the clamped strip.

Another feature of the invention resides in the anism engageable with the shoe bottom fcrepart.

These and other features of the invention including novel arrangements of parts will now be described in detail in connection with a preferred illustrative embodimenttherecf, reference being had to the accompanying drawings, in which:

Fig. 1 is a left-hand side elevation of a machine in which the invention is embodied, portions of the stand and treadle connections being broken away; I

Fig. 2 is an enlarged sectional view of the operating portion of the machine as seen in Fig. 1, the section being taken along the longitudinal center line, and a shoebeing shown in initial operating position;

Fig. 3 is a sectional view similar to Fig. 2 but further enlarged and indicating the shoe and the machine in a subsequent stage of the trimming operation;

Fig. 4 is a plan view of the operating portions of the machine;

Fig. 5 is a continuation of Fig. 4 and shows portions of the drive mechanism;

Fig. 6 is a perspective of spreaders and plow shown in Fig. 4;

Fig. 7 is a plan view of a portion of the mechanism viewed in Fig. 4, the elements of Fig. 6, and other elements and wiping mechanism being omitted for clarity;

Fig. 8 is an enlarged plan of a portion of the machine operating on an unlasted, spread toe margin;

Fig. 9 is an inverted plan of a portion of the work in position for trimming;

Fig. 10 is an enlarged horizontal section of cutter clamping mechanism shown in Figs. 1, 2. and 3;

Fig. 11 is an exploded view, in perspective, of adjusting mechanisms shown in Fig. 4';

Fig. 12 is a perspective of a shoe forepart prior to having its toe trimmed by the illustrative machine; and

Fig. 13 is a perspective similar to Fig. 12 showing the forepart after it has been trimmed in this machine.

The machine comprises a main frame l0 (Fig. 1) iixedly mounted on a stand I2 or any preferred stationary supporting means of convenient height. A pair of oppositely disposed bracket portions I4 of the frame I0 extend upward therefrom and are bridged by a horizontal U-shaped shearing bed member I6 detachably secured thereto as by bolts I1 (Figs. 4 and 8). A cutter carriage I8 is arranged for movement forwardly and rearwardly between the portions I4 and beneath the member IE together with several work engaging elements hereinafter to be described. The carriage I8 supports, by means of stud bearings, eight rollers 20 (only the four on one side being shown in Fig. 1) four being in engagement with the upper and four with the lower sides of a horizontal guide plate 22 extending from the For enabling an operator conveniently to posi-- tion the shoe relatively to the operating instrumentalities a toe abutment 24 (Figs. 1, 2, and 3) is mounted for adjustment toward or from the shearing plane of the member I6, the latter supporting a block 28 having an inclined bore threaded to receive a knurl-headed shank 28 of the abutment 24. A heel rest 38 at the front of the machine includes a split clamp 32 integral with the frame I8, a vertically adjustable clevis 84 supported thereby and a T-shaped member 86 adjustably held bysaid clevis for engagement with the rearward portion of a shoe bottom.

A pair of upright members 38 afiixed to the front of the frame I8 are bored to receive a pin 48 on which a slightly resilient and tongue-like insole toe support 42 is pivotally mounted and normally extends over the cutter carriage I8 t0- ward the shearing bed member I8.

Wipers 44 and 46 (Figs. 4, 8, and 8) are dat segmental plates arranged for movement widthwise of the member |6 and occupy recesses formed transversely in its lower face. The lower surface of these

wipers

44 and 46, together with that face, constitute the smooth shearing bed against which the toe portion of an upper is to be spread as will be described. The

wipers

44, 46 are each provided with a guide slot 48 for receiving one of the bolts |1, and the adjacent ends of the wipers are curved toward one another to provide a formation adapted to accommodate the toe end of a shoe. Ears 58, 52 (Figs. 8 and 9) respectively project from the

wipers

44, 46 and, when the latter are suitably moved, are engageable with the bottom of a lasted shoe at its marginal portions. A

For moving the

wipers

44 and 46 toward one another for a purpose later to be explained, the cutter carriage I8 is provided with oppositely disposed

cam slots

54, 56 in which cam followers 58, 68 are respectively located. Since adjusting and actuating means for both wipers are similar, only the arrangement relating to wiper 44, cam 54, follower 58, and associated parts (as shown in Figs. 4 and 11) will be described. The follower 58 is rotatably mounted on a shank 59 threaded into the bifurcated end of a member -62 and the latter is provided with a cylindrical leg internally threaded to receive an adjusting screw 64. A sleeve 65 receives the leg telescopically and is pinned against telescopic movement with respect to the screw 64. An element 66 has an elongated slot 61 for receiving the shank 58 and is movable in a mortise formed longitudinally in the sleeve 65. A vertical cylindrical portion 68 of the element 66 is pivotally mounted on a hinge pin 18 supported by the bracket I4. Turning the screw 64 accordingly is effective to position the shank 58 in the slot 61 and thus changes the distance between the axis of the follower 58 and the hinge pin 18. An arm 14 also pivotally mounted on the pin 18 and integral with the cylindrical portion 68 carries in an elongated slot 16 a roller 18 having its stud bearing secured to the wiper 44 as by a nut 80. The screws 64 will both be turned appropriately to adjust the degree of swing imparted to the arms 14, respectively, and hence control the extent of widthwise closing movement of the

wipers

44, 46.

A pair of work spreading member 82, 84 (Figs. 2, 3, 4, and 6) are respectively supported for horlzontal pivotal movement on a pair of pins 86 secured to the front of a generally iiat plate 88.

The plate 88 has adepending cylindrical projecttion 88 received by the carriage I8. A pin 88 ailixed in this projection extends into a slot 82 formed in the carriage I8. Three compression springs 84 fitted in recesses of the carriage I8 urge the plate 88 upwardly, its lower limit being determined by the pin 88 and slot 82, and its upper limit by the heightwise adjustment afforded by a screw 88 threaded into said projection and having its head engaging shoulders of the carriage I8. A raised portion 88 oi' the plate 88 (Fig. 6) constitutes a fiat symmetric plow having a protruding nose portion adapted to underlie even the narrowed widths of toe portions. Each oi' the

spreaders

82, 84 has a raised lip portion |88 engageable with the work and corresponding in contour with its side of the plow 88.

For moving the

spreaders

82, 84 apart each is provided with a roll |82 that engages the walls of cam slots |84, |86 (Fig. 4) formed in levers |88, ||8 respectively. These levers are fulcrumed on pins ||2 respectively mounted on a rearward raised portion .of the frame I0. Rolls II4, ||4 (Figs. 4 and 7) respectively depend from the forward ends of the levers |88, ||8 and ride in opposite sides of a V-shaped cam track ||8 secured to the carriage I8.

The preferred trimming tool ||8 is a slightly dished rotary disc type of knife (Figs. l, 2, 3, and 4) mounted centrally on the carriage I8 and having its circular cutting edge arranged in shearing relation with the lower face of the cutting bed member I6. The cutting edge is substantially concentric with the trailing edge of the plow 88. The diameter of the knife I I8 is preferably equal to the widthwise dimension of the largest toe portion to be operated upon. A flat annular band |28 circumscribed by the cutting edge is helpful in partially supporting a shoe during the trimming operation. The knife ||8 is secured to the upper end of a vertical shaft |22 by means of a screw |24, and a pin |26 projecting into the knife ||8 from a flange of the shaft |22 locks the latter against rotation relatively to the 45 knife ||8. 'I'he shaft |22 is rotatable in a sleeve bearing |28 journaled in the carriage I8. Means are provided to adjust the knife I8 heightwise of the shearing plane of the member I6 and

wipers

44, 46 so as to accommodate different thicknesses 50 of upper. Thus, as shown in Fig. 10, a' pair of clamping members |38 slidable within a bore of the carriage I8 engage opposite portions of the bearing |28. A bolt |82 threaded into one of the members |38 will, when turned, move the mem- 55 bers |38 into and out of clamping relation with the bearing |28 to support the knife heightwise as desired. For purposes hereinafter to be described a pinion gear |34 is affixed to the lower end of the shaft |22, being held thereon by a collar and pin |36. The teeth of this gear |34 are arranged to mesh with those of a horizontal rack |38 xedly secured within a slot of the guide plate 22 by screws-|38. Also rotatably mounted on the carriage I8 but arranged to follow in the operative path of the knife I I8 during a toe trimming operation is a projection preferably in the form of a fulcrum roll |48 (Figs. l, 2, 3, and 4). The roll |48 is horizontally disposed with its perimeter extending somewhat above the shear- 70 ing level of the knife II8 and arranged to be progressively engageable with the tongue-like toe support 42.

While the motor |42 is normally in continuous operation, a single revolution (in the direction shown by the arrow in Fig. 1) of the drive shaft |48 is utilized to move the carriage |0 through a trimming stroke relative to the shearing bed member I6 and back to the initial starting position shown in Fig. 1. Accordingly, a single revolution clutch mechanism of conventional design is provided and will be briefly described with reference to Figs. 1 and 5. A hub |80 having peripherally spaced blocks |82 aiiixed therein is normally freely revolvable with the pulley |46 and is backed by one of the bearings |50. A collar |84 aflixed to the shaft |48 by a pin |86 is bored slidably to receive a shank portion |88 of a clutch cam |90. The shank |88 may extend between two blocks |82 and has a bore across which a pin |92 extends. A compression spring |94 within said bore bears on the collar |84 and against the pin |92 to urge the shank |88 into a recess between the blocks |82. A clutch pin |96, treadle-operated as will be described, normally is in raised position as seen in Fig. wherein it engages the clutch cam |90vto hold the shank |88 out of driving engagement with the blocks |82. When depressed, however, the clutch pin |96 permits the spring |94 to move the shank |88 into driving relation between the blocks |82. On being raised again the pin |96 engages the cam |90 to shift the shank portion |88 out of driving engagement, and a key |98 axially slidable in the collar |84 under the inuence of a cushioning spring 200 serves to hold the clutch pin in steady engagement with the cam |90.

'I 'he clutch pin |96 extends through the stand |2 (Fig. 1) and is provided with a. spring 202, an adjacent xed collar 204 and a fixed collar 206. Above the spring 202 the clutch pin |96 is received by a bracket portion of one of the bearings |50, said portion serving to limit down movement of a stop 201 secured to the clutch pin. A rod 208 supported by the stand l2 serves as fulcrum for a bell crank 2|0, one arm of which extends between the collars 204 and 206 for connection with the pin |96. The bell crank 2|0 is actuated to raise or lower the pin |96 by a series of connecting members including a lever 2|2, bell crank 2|4, treadle rods 2|6 and treadle 2 |8. A tension spring 220 having one end affixed to the stand I2 is connected to the rods 2|6 so as to yieldingly support the treadle 2|8 in a normally inoperative position.Y

By means now to be described, the clutch pin |96 is yieldingly returned to its upper or starting position when a cycle has been started. Apin 222 (Figs. 1 and 5) afxed in an arm of the bell crank 2|0 is arranged to be accommodated by a. notch formedinthe lever 2|2. A bifurcated link 224 pivotally connected to one of the bearings |54 has elongated slots 226 for receiving a stud 228 mounted on the lever 2|2. A tension spring 230 (Fig. 1) connects the lever 2|2 and the bell crank 2|0. After the bell crank 2|0 and the lever 2|2 have been actuated against the resistance of the spring 230 to start the cycle, the stud 228 will be lifted by engagement with the lower ends of the slots 226, the link 224 being swung by a crank arm |52. The lever 2|2 is consequently raised to free its notch from the pin 222 and thereby permits the spring 230 to rock the bell crank 2|0 and raise the clutch pin |98 against the resistance of the spring 202.

To start the machine on its trimming cycle the operator will trip the clutch mechanism by momentarily stepping on the treadle 2|8. 'I'he resultant motion of the clutch pin |98 permits a single revolution of the shaft |48 as described and, by means of moving in phase the crank arms |52, connecting rods |56, |58, and guide rods |68, |10, the cutter carriage |8 is moved toward and then away from the shearing bed member I6. During its movement of translation with the carriage |8, the trimming knife ||8 is also rotated in the shearing plane by reason of relative movement of the pinion |34 and rack |38 thereby effecting a draw cut on the work as well as shearing action.

Before the knife ||8 engages the work, however, the power means are operative properly to position the unsecured material against the shearing bed. As the carriage |8 advances with the plate 88, the cam tracks ||6 swing the arms |08, ||0 apart and they in turn respectively operate to move the

spreaders

82, 84 widthwise of the toe. As a consequence, the lips |00 of these spreaders are moved outwardly, i. e., from their positions as shown in Fig. 4 to those shown in Fig. 8, to progressively spread and atten the work against the shearing bed as shown in Fig. 9. The springs 94 yieldingly urge both the lips |00 and the closely following plow 98 upward, thereby smoothing and clamping the lining against the shearing bed and just ahead of the oncoming knife ||8.

At the start of this spreading action the

wipers

44, 46, selected and suitably adjusted to conform with the toe contours to be trimmed, are actuated by the carriage motion to close about the toe as seen in Figs. 8 and 9. They thus advantageously hold the stock in close contact with the last and the toe perimeter of the insole, and the

ears

50, 52 serve evenly to fold the surplus material close to the endmost side lasting fasteners inserted in the lasting margins. As the knife ||8 advances, the fulcrum roll |40 pushes upwardly on the toe support 42 (Fig. 3) and thereby causes the last yieldingly to tension the clamped lining and upper downwardly over the toe contour. To maintain this tension during trimming, which is desirable in order to obtain lining severance along a line close to the insole proille, an operator will prevent the shoe from rising off the heel support 36 by bearing down somewhat lon the the surplus lining, which was allowed to fall away from the knife Ill upon severance. has' been trimmed so that but little lining extends from the insole in the vicinity of the endmost side lasting fasteners and only to the extent of the thickness of the upper, approximately. around the perimeter of the toe, thereby providing an excellent condition for toe lasting.

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

l. A machine for trimming surplus lining from the unlasted toe of a partial] fabricated shoe in bottom-down position, comprising a shearing bed, said bed including movable wipers cooperative to receive the perimeter of the toe, a carriage movable toward and from the bed, a circular knife mounted on the carriage for rotation in a plane substantially parallel with that of the shearing bed, lining spreading members yieldably mounted on the carriage to engage the unlasted margin ahead of the knife, and means foi` moving the carriage, said means being effective to rotate the knife and operate said wipers and spreading members.

2. A machine for trimming unlasted marginal toe material comprising a shearing bed including cooperative wipers engageable with the upper at the toe, a carriage movable relatively to said bed and having members arranged to spread the unsecured toe lining thereon, a rotary knife mounted on the carriage to follow said members in shearing relation to the spread lining, the knife being spaced heightwise from said bed by the thickness of the upper. and means for moving said carriage, said means serving to close said wipers on the upper about the toe and operate said members.

3. A trimming machine comprising a frame, shoe engaging means mounted on the frame' including a at insole supporting member, a rcarriage guided for movement relative to said means by said frame, clamping means mounted on the carriage and arranged to clamp a strip of lining projecting from the toe portion of the insole, a knife mounted on the carriage and having a cutting edge adapted to sever the clamped strip, said member being movable heightwise of the shoe engaging means by said carriage to tension the clamped strip to be severed.

4. In an upper trimming machine having a frame, mechanism for moving a cutter carriage movable with respect to the frame and in' shearing relation to a toe receiving member, means mounted on the carriage for clamping the marsin of the upper to be trimmed, an insole supporting member engageable with the toe portion. l

and a fulcrum mounted on the carriage to move the insole supporting member heightwise of the toe receiving member during operative movement of the carriage, whereby the clamped marginal material is tensioned before being shorn.

5. A machine for trimming the marginal toe portion of a partially fabricated shoe comprising a frame, a toe receiving shearing bed mounted on the frame, a trimming knife rotatable in shearing relation to the bed, a carriage guided by the frame for movement with the knife toward and from the bed, means operated by said carriage for spreading and clamping the marginal toe portion outwardly on the bed, and a member moved by the carriage into engagement with the toe portion of the shoe bottom for tensioning the margin to be trimmed.

6. A machine for severing surplus marginal toe material from a shoe. comprising ashearing member including wipers movable wiutnwise of the toe'portion to engage the upper, an insole support, a carriage movable with respect to the insole support, a trimming knife carried bythe carriage beneath said support and into and out of shearing relation with said member, spreaders progressively engageable with the marginal toe lining, and mechanism operable by movement of the kinfe into said shearing relation and in advance thereof to close said wipers and operate said spreaders.

'7. In a machine for trimming surplus toe material, a cutter carriage, a toe receiving bed, trimming means movable by the carriage into shearing relation with said toe receiving bed, and means operated by the carriage for tensioning the unsecured toe upper and lining against said bed in advance of shearing action by the trimming means, said tensioning means including inwardly movable wipers engageable with the toe upper, outwardly movable spreaders engageable with the toe lining, and means for moving the toe por tion of the insole heightwise of said bed as the' trimming means advances.

8. In a machine for trimming surplus marginal material from the toe of a shoe on a last having a frame, a shearing bed supported thereby and having a portion conforming with said toe, a carriage reciprocably mounted on the frame, a circular knife borne by the carriage into shearing relation with said bed, a flat insole supporting member pivotally mounted on the frame and extending above the knife and toward the bed, means operable by the carriage to spread the marginal material ahead of the knife, wiping means operable by the carriage to restrain upper material adjacent the perimeter of the toe of the insole, and means on the carriage engageable with said insole supporting member to tension the upper over the toe portion of said last before the knife shears said marginal material.

9. A trimming machine for operating on marginal toe material of shoes in bottom-down position comprising a shearing bed, said bed including wipers cooperatively movable to embrace a toe portion at its perimeter, means movable transversely of said perimeter to hold the work margins spread outwardly against the underside of the bed, a tongue-like member mounted for pivotal movement about a horizontal axis and extending lengthwise of the shoe, said member being adapted to engage the insole at the toe portion, trimming means movable beneath said toe portion engaging member andjin shearing relation to the bed, and means operative by advancement of the trimming means to raise said member relatively to the path of the trimming means whereby the shoe bottom is urged heightwise to tension the upper material being trimmed.

JOHN M. EWART. LESTER. S. MACDONALD.

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

UNITED STATES PATENTS Number Name Date 1,680,384 Jorgensen Aug. 14, 1928 2,199,512 Roberts May 7, 1940 2,466,798 Elliott et al Apr. 12, 1949 FOREIGN PATENTS Number Country Date 110,378 Australia Apr. 15, 1940