US2085149A - Trimming machine - Google Patents

Description

June 29, 1937. c. F. FITZGERALD TRIMMING MACHINE Filed June 5, 1955 Patented June 29, 1937 meant PATENT OFFEE Application June 5, 1935, Serial No. 25,104

13 Claims.

insoles, as distinguished from the projecting relation of the surplus materials in welted and turn shoes.

With regard to those types in which the surplus materials to be severed lie normally in confronting relation to the insole, good shoe-making requires that they be severed on a line virtually parallel with the edge of the insole and at a distance about or inch in from the edge. This trimming operation has heretofore been done s6 quite generally with machines of the type shown in United States Letters Patent No. 429,065, granted May 27, 1890, on application of Schaadt and Clark, but not, however, without some difficulty attributable to the confronting relation of the insoles and the surplus materials to be severed, and another difficulty in those shoes that have been lasted with curved wire staples driven in the manner disclosed in United States Letters Patent No. 1,815,298, granted July 21, 1931 on application of George Goddu.

Although the patent last mentioned shows the points of the staples embedded in an insole, many stapling operators in shoe factories prefer and use longer staples the points of which, more often than not, project from the outer face of the insole, in many instances as much as T g inch. Under such conditions some of the projecting points become caught on the stationary cutting blade of .a trimming machine of the type above mentioned, thereby arresting the feeding movement of the shoe and requiring repeated effort on the part of the operator to proceed with the trimming. Moreover, if the points of the staples encounter the cutting edges of the trimming blades those edges become quickly dulled in consequence thereof.

To overcome the adverse conditions above pointed out the present invention provides an improved trimming machine comprising a deflector arranged to engage the lining of an inturned margin of surplus upper materials lying on or confronting the insole of a lasted shoe, powerdriven mechanism arranged to reciprocate the deflector with short rapid strokes to bend a free por- 55 tion of the margin away from the insole a little at a time, and power-driven cutting means arranged to sever the free portion that has been fed past the deflector with a cut in a plane virtually parallel with the face of an insole.

Preferably, and as herein shown, the deflector is shaped and arranged to engage also the face of the insole and thereby control the closeness of the trimming cut, to the end that projecting points of staples shall not interrupt the feeding of the work or dull the cutting means. Accordingly, the deflector is provided with a thin workguiding blade one edge of which is arranged to run onthe insole in the crease formed by the junction therewith of the overdrawn upper materials. To avoid interference with the feeding of a shoe in which the points of lasting staples project as above explained, the thickness of the work-guiding blade is limited to a dimension less than the distance between the crease and the line of the staple-points. Consequently, when the crease is maintained against the guiding blade the latter will clear the points of the staples and cause the latter to clear the trimming cutters. Moreover, the guiding blade preferably embodies a helicoidal twist that imparts gradually increasing ab-ruptness to its surface that deflects the free margin of surplus materials across the plane of the trimming cut.

Referring to the drawing,

Fig. 1 is a side elevation of a trimming machine embodying the present invention in a preferred form;

Fig. 2 is a front elevation of the work-engaging elements thereof;

Fig. 3 includes two sectional plan views of the same parts in different positions;

Fig. 4 is a sectional elevation including a portion of a lasted shoe in process of being trimmed; and

Fig. 5 is a perspective view including the fore part of a lasted shoe and portions of a stationary cutting blade and the power-operated deflector or work-guiding blade.

Before describing the novel subject-matter of the present invention, this description will deal with the known features embodied in a machine of the type illustrated not only in the accompanying drawing but also in the aforesaid Letters Patent No. 429,065. The machine comprises a frame it], a stationary cutting blade H, a reciprocatory cutting blade l2, a horizontally movable plunger I3 by which the blade I2 is carried, a power-driven shaft l4 journaled in the frame, an eccentric 15 carried by the shaft, an eccentric strap 16 for communicating motion from the cocentric to the piunger 93, a pivot-pin H by which the eccentric strap and the plunger are operatively connected, and a pulley i8 secured to the shaft for receiving rotation from a belt (not shown).

Referring to Fig. 3, the stationary blade II is provided with an oblique cutting edge 20 and the blade i2 is provided with an oblique cutting edge 2! these edges being arranged to cross each other in shearing relation and to form a V-shaped throat into which the materials to be severed are fed manually. A portion of the blade i l extends upwardly in contact with the front face of an overhanging portion of the frame it, and is provided with a slot 22 (Fig. 2) to receive clamping bolts 23 and to provide for vertical adjustment to locate the cutting edge 26 in shearing relation to the cutting edge of the blade l2. All the elements above described are of well-known construction.

A typical lasted shoe of the Littleway type is illustrated in Figs. 4 and 5. The assemblage comprises a last 25, an insole 25, the usual upper materials consisting of a plurality of layers including the outer layer 2i of leather or other material, an inner layer 28 or lining of woven fabric or other material and, if desired, an inter mediate layer or doubler not represented individually.

In accordance with the disclosure in the aforesaid Letters Patent No. 1,815,298 the overdrawn margin of upper materials 27 and 28 is secured to the insole 25 by wire lasting staples 29, the legs of which are curved and the points of which underlie the free portion of the overdrawn margin inside the line of junction on which the upper materials and the insole are connected by the heads or cross-bars of the staples. Although it is not always intentional to cut the staples so long as to cause their points to project from the face of the insole, many, if not all, stapling machine operators do, in fact, adjust the stapling mechanism to cause such projection as represented in Fig. 4. The extent of such projection in many cases is as much as inch. In con-.

sequence thereof the points of the staples have heretofore, under certain conditions of manipulation of shoes in process of being trimmed with machines of the type under consideration, become caught on the stationary blade H, thereby in many cases arresting the feeding movement of the work and dulling the cutting edge of that blade.

Moreover, whether or not the points of the staples project, the free portion of surplus materials that requires to be severed after such a shoe has been lasted lies normally in confronting relation to the insole and actually in contact therewith at many points. Consequently, to sever this free portion of the margin with a cut in a plane virtually parallel with the face of the insole requires bending the surplus materials away from the insole to an upstanding position. In machines of the type under consideration, it has heretofore been necessary to accomplish such bending solely by hooking the cutting portion of the blade 5 under the surplus materials and supporting the shoe manually with upward force against one or both of the cutting blades. Under favorable conditions, the blade H does bend or raise the surplus materials to an inclined position but not to an erect position. In many instances, on the other hand, a wrinkle or other irregularity in the free margin of surplus materials will escape the control of the blade i l and run under its outting portion instead of over it, thereby interrupting the progress of the trimming.

To overcome the difficulties above mentioned and to facilitate the work of severing the surplus materials as pictured in Figs. and 5, the present invention provides the novel means now about to be described. A deflector 36 provided with a helicoidal work-engaging blade 3i is suspended from a horizontal supporting pivot 32 about which it may oscillate. The pivot 32 is secured in a bracket 33 afiixed to the frame It by screws 34. As shown in Fig. 3, the heel of the blade 3! occupies the V-shaped throatformed by the cutting edges 20 and 2i, while the toe of the blade projects beyond the throat. The lower edge of the blade EE is arranged to run in the crease formed by the junction of the insole and the margin of upper materials, and at the same time to clear the projecting points of the staples 29, since it extends in a direction parallel to the direction of feeding motion by which the surplus materials about to be severed are fed into the V- shaped throat. Moreover, the lower edge of this blade is at a level slightly below the bottom of the cutting blade l2, to counteract the projection of the staple-points and the thickness of the upper materials lying on the margin of the insole outside the line of the staples.

The heel of the blade Si is vertical but the toe is inclined to facilitate its entrance between the insole and the free portion of the margin of upper materials that has been bent only partiallyaway from the insole, but as the surplus materials progress from the toe toward the heel of the blade they are gradually deflected to a vertical position by the helicoidal deflecting surface of the blade and are finally braced by the heel against the thrust of the movable cutter at a point in front of the latter.

The invention also provides for utilizing the reciprocatory motion of the plunger 53 to oscillate the deflector SEE about the axisof its supporting pivot 32, and in consequence thereof to bend and deflect the surplus materials a little at a time. The motion thus imparted to the deflector is of small magnitude but rapid, the rate of reciprocation being about 1800 cycles per minute, that is, one stroke for every stroke of the cutting blade 52. This rapid oscillation of the deflector facilitates the feeding of the work and to that extent relieves the operator from manual effort other than that required to support the shoe and manipulate it in accordance with the requirements of trimming. Moreover, although the heel of the deflector stands in front of the movable cutting blade where it provides an abutment to brace the uncut work against the cutting movement of that blade, the oscillation of the deflector maintains the abutment portion thereof close to the cutting point, notwithstanding movement of the cutting point lengthwise of the cutting edges.

Motion for operating the deflector is communicated thereto by an antifriction roll it mounted on a stud ii. The stud is carried by a saddle 46 that also serves to clamp the cutting blade l2 to the plunger is. The roll ii? is arranged to run to and fro on a finger i2 formed on the deflector. The cooperating surface of the finger ii is oblique with respect to the path of travel of the roll 48 (see Fig. 3) and its effect is to move the deflecting blade 3! toe foremost. Movement of the defleeting blade in the opposite direction is derived from a tension spring 43 (Fig. 2) the upper end of which is attached to an anchoring pin 44 and the direction of its cutting movement the de-- fiecting blade 3| is moved toe foremost, thatis,

in a direction counter to the direction of feed. Consequently the blade 3! not only ,moves in ac.- cordance with the shifting of the cutting point lengthwise of the cutting edges, but it also erects a little more of the oncoming surplus materials about to be severed as shown in Fig. 5 in which the movable cutting blade 12 is omitted to avoid obscuring the manner in which the uncut mate rials are turned up and braced as aforesaid.

While the magnitudes of the strokes of the cut- I ting blade I2 and of the deflecting blade 3! are not necessarily restricted to any dimensions it has been found that of an inch is a sufficient length of travel for the cutting blade and that /8 of an inch or less is sufficient for the deflecting blade not only to turn up the surplus materials but also to avoid interference with the cutting edge 2!.

Having thus described my invention, what I claim as new and desire to secure by Letters 1 Patent of the United States is:

l. A trimming machine comprising a deflector arranged to engage the lining of an inturned margin of surplus upper materials lying on or confronting the insole of a lasted shoe, powerdriven mechanism arranged to reciprocate said deflector with short rapid strokes to bend a free portion of said margin away from the insole a little at a time, and power-driven cutting means arranged to sever the free portion of said margin that has been fed beyond said deflector with a cut in a plane virtually parallel with the face of the insole.

2. A trimming machine comprising powerdriven cutting means arranged to sever surplus upper material on the bottom of a lasted shoe With a cut in a plane virtually parallel with the face of the sole thereof, a member arranged to engage the face of the sole to control the closeness of the severing cut, said member being ahead of said cutting means and also arranged to bend a free margin of the surplus upper material away from the sole, and power-driven mechanism arranged to reciprocate said member with short rapid strokes toward and from said cutting means.

3. A trimming machine comprising powerdriven cutting means arranged to sever surplus upper material on the bottom of a lasted shoe with a cut in a plane virtually parallel with the face of the sole thereof, a member arranged to engage the face of the sole to control the closeness of the severing out, said member being ahead of said cutting means and having a surface of gradually increasing abruptness arranged to deflect and bend a free margin of the surplus upper material away from the sole, and power-driven mechanism arranged to reciprocate said member "in lines virtually parallel with the direction of movement necessary to feed the surplus material to said cutting means.

'4. A trimming machine comprising two cooperative shearing cutters having converging cutting edges forming a throat to receive a margin of surplus upper materials projecting from a seam by which it is connected to the sole of a partially fabricated shoe, power-driven means by which one of said shearing cutters is reciprocated to sever such a margin fed into said throat, a movable abutment member arranged to brace the surplus materials against the cutting thrust of said reciprocated cutter, and means by which said'abutment member is moved to and fro in synchronism with the movements of said reciprocated cutter and in lines virtually parallel with the-path of feeding movement of the materials being severed.

5. A trimming machine comprising two cooperative shearing cutters having converging cutting edges forming a throat to receive a margin of surplus upper materials projecting from the sole of a lasted shoe, power-driven means by which one of said shearing cutters is operated to sever such a margin fed into said throat, a work-guiding member arranged to occupy the entrance of said throat to direct the margin into the throat, and mechanism by which said' work-guiding member is reciprocated lengthwise of the margin in contact therewith.

6. A trimming machine comprising a fixed cutter and a reciprocatory cutter having converging cutting edges in shearing relation and forming a throat to receive a margin of surplus upper materials projecting from the sole of a lasted shoe, a power-driven reciprocatory member by which said reciprocatory cutter is operated to sever such a margin fed into said throat, an abutment member arranged to brace said margin against the thrust of said reciprocatory cutter, and means including a cam element and a cooperative part carried by said members to reciprocate said abutment member in synchronism with the movement of said reciprocatory cutter.

7. A trimming machine comprising two cutters having cutting edges in cooperative shearing relation to sever a margin of surplus upper materials projecting from the sole of a lasted shoe, a power-driven member by which one of said cutters is carried back and forth across the cutting edge of the other said cutter, a workguiding member arranged ahead of said cutters in the line of feeding movement to direct the uncut margin of surplus upper materials between said cutting edges, and means operated by said power-driven member to reciprocate said workguiding member in a path virtually parallel with the length of the margin in contact therewith.

8. A trimming machine comprising two cutters having cutting edges in cooperative shearing relation, a power-driven member by which one of said cutters is reciprocated across the cutting edge of the other said cutter, a work-guiding member movable relatively to said reciprocatory cutter, and means arranged to reciprocate said work-guiding member in timed relation to the cutting movements of said reciprocatory cutter, said Work-guiding member being arranged ahead of said cutters in the line of feeding movement to direct the uncut substance to be trimmed into the field of operation of said cutters.

9. A trimming machine comprising a workguiding member formed and arranged to project into a crease between two confronting and connected work elements and thereby bend a free margin of one of said elements away from the other one of said elements, power-driven means by which said work-guiding member is reciprocated in a path virtually parallel with the crease in which it operates, and power-driven cutting means arranged to sever the bent margin with a cut in a plane virtually parallel with the confronting elements forming saidcrease.

10. A trimming machine comprising poweroperated cutting means arranged. to sever a free margin of surplus upper materials projecting from the sole of a lasted shoe, and a work-guiding member arranged to engage the work just ahead of said cutting means, said member having an edge and a helicoidal surface of which said edge is one boundary, said edge being arranged to lie in and extend lengthwise of the crease between the sole and said free margin, and said helicoidal surface being arranged to bend the free margin progressively away from the sole in consequence of feeding the shoe in contact with and lengthwise of said edge.

11. A trimming machine comprising a fixed blade and a movable blade having angularly related cutting edges in shearing relation, powerdriven means for reciprocating said movable blade across the cutting edge of said fixed blade,

a movable abutment arranged to brace the uncut work in front of said movable blade, and means by which said abutment is shifted to and fro crosswise of the path of said movable blade and in synchronism with the reciprocatory movements thereof.

12. A trimming machine comprising a fixed blade and a movable blade having angularly related cutting edges in shearing relation, powerdriven means for reciprocating said movable blade across the cutting edge of said fixed blade, the cutting edge of said movable blade being oblique with respect to its path of reciprocation, a member arranged to oscillate about an axis, a portion 01 said member being arranged to project in front of said movable blade to brace the uncut work against the cutting motion of that blade, and means by which reciprocatory movements of said movable blade are communicated to said oscillatory member to move its work-engaging portion to and fro crosswise of the path of said movable blade.

13. A trimming machine comprising poweroperated cutting means arranged to sever a free margin of overlasted upper material projecting from the sole of a lasted shoe, and a member arranged to guide untrimmed portions of said margin to said cutting means, said member having a thin edge arranged to run in the crease formed by the junction of the sole and said margin but being formed to clear projections on the face of the sole inside but adjacent to the boundary of the area defined by said crease.

CHARLES F. FITZGERALD.

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