US1431967A - Insole-heel-seat-trimming machine - Google Patents

Description

T. LUND..

INSOLE HEEL SEAT TRIMMING MACHINE. APPLICATION FILED DEC. 1 3. 1918.

Patented Oct. 17, 1922.

/A/ l/E/V 747%. M M

Patented Oct. 17, 1922.

i 1 srmes THOMAS LUND, or BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED snon MACHINERY CORPORATION, or PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

INSOLE-HEEL-SEATTRIM1VIII TG MACHINE.

Application filed December 13, 1918. Serial No. 266,589.

one embodiment of the invention particularly designed to trim the edge of an insole around the heel seat portion, for which purpose the invention has features thatare especially adapted to meet the cond1tions that prevail when trimming an lnsole on a last prior to assembling a shoe upper therewith. The invention is not, however, limlted to this special use, because it includes features that will be found advantageous in trimming soles other than insoles, and in trimming portions other than the heel seat portion.

In the manufacture of welt shoes it has been the practice heretofore to attach an insole temporarily to a last with the toe end of the insole even with the toe end ofthe last, and when, as often happens, the insole is longer than the last, to trim the excess material of the sole around the edge of the heel seat portion. With a view tofacllltating and improving this practice in particular, the present invention has been embodied in a machine adapted to trim the heel seat portion of an insole more or less closely to the contour of the last, and comprising improvements in construction that improve the operation.

One important feature of the inventlon consists in a rotary knife having a circular cutting edge which is moved in the direction of its length to execute a drawing out. One advantage of a drawing out is that it minimizes the degree of force necessary to feed the work which, in machines for this purpose, is usually accomplished manually. Another advantage of such a cut is that it avoids tearing the sole even though the cutting edge be considerably dulled by wear. This permits longer periods of service between sharpening operations and insures smooth cutting, particularly at the edges of the sole.

The knife may, and ordinarily would, remain in the work from beginning to end of an operation, and for this reason it steadies the work and, to some extent, guides the latter. This form of knife, therefore, possesses characteristics especially fitting it for use in a machine for trimming the edges of soles generally. For trimming the heel seat of an insole it has a special advantage in that it can not form abrupt shoulders or corners on the edge of the sole where the trimming begins and ends. This objection arises frequently in machines that employ a trimming cutter of the type that executes successive chopping cuts each complete and independent of the others. Various devices have been made to prevent the'formation of such shoulders because frequently they are so prominent as to form lumps at the sides of the upper of the finished shoe. This problem is more fully set forth, for example, in Letters Patent of the United States No. 1,311,197, granted July 29, 1919, on application of H. D. WVebb.

A gage is provided to hold the last out of contact with the trimming knife, and it is provided with a tongue arranged to extend between the margin of the sole and the last to sustain the margin out of contact with the last and in the most desirable relation to the knife. This gage is preferably mounted so as to be adjustable to locate the line of cut more or less closely to the edge of the last.

Another important object of the invention is to sustain the margin of the sole against the cutting stress of the knife without, however, offering any considerable frictional resistance to the feeding of the work relatively to the knife. For this purpose the invention includes asole-rest arranged to engage the bottom face of the sole, the main body of the rest being fixed, but being supplemented by an anti-friction member arranged to have rolling contact with the sole to minimize the friction between the sole and the sole-rest. This anti-friction member would preferably be mounted in such manner as to enable it to yield so that the sole may not lose too much of the benefit of the fixed element of the sole rest. In consequence of providing the anti-friction member as apart of the sole-rest, the sole is held against the last with sufficient pressure to prevent the sole from slipping edgewise relatively to the last, and for this reason the tack that has heretofore been necessary to fasten the heel seat portion of the sole temporarily to the heel seat'p'ortion of the last may be omitted. When the anti-friction member is in use the friction between the sole and the sole-rest is so slight in comparison to that between the sole and the last that the sole follows the last instead of slipping relatively thereto.

The sole-rest and the tongue of the gage hereinbefore mentioned form, conjointly, a channel-to receive and guide the margin of the sole, and the sole-rest is preferably mounted so as to be adjustable toward and from the'tongue to vary the width of the chlannel according to the thickness of the so e. i

For some purposes, as in the case of an insole,it is desirable to bevel the edge of the solerather than to cut it squarely. For this purpose the sole-rest is arranged to present a fiat sole-sustaining surface of considerable area, and said surface is arranged relatively to the knife to insure a beveled cut when the bottom face of the sole is seated thereon.

According to the embodiment illustrated the trimming knife is of annular form as distinguished from disk form, and the plane of the sole-rest is tangential to a circle concentric to, but of less diameter than, the cutting edge, in order to produce the beveled cut above mentioned.

The invention includes, in addition to the foregoing features, other details of construction and combinations of parts as more fully set forth in the following description, and particularly pointed out in the claims.

In the accompanying drawings, which illustrate one embodiment of the invention,

Fig. 1 is a view in side elevation of. a machine embodying the present invention;

; Fig. 2 is a sectional plan View, on the line 22, Fig. 1, showing the parts on a somewhat enlarged scale; and

r Fig- 3 is a perspective view of the knife, gage, and sole-rest, on a larger scale.

- The machine base 1 supports a bracket 2, which carries bearings for a shaft 1- upon which is mounted. a knife 6, which is herein illustrated as being hollow or cup-shaped having the general form of a truncated cone and being provided at its base witha c011- tinuous annular and preferably sinuous cutting edge 7 A belt 8 passes over idlers such as' that indicated at 10, and is driven to rotate-the knifeshaft 4: through the medium of apulley 12 on the latter. An arrow in Figure 2 indicates the preferred direction of rotation, although the latter may be reversed ifthe available driving facilities are such that the reverse direction would be more convenient.

of the knife when the last is positioned as shown in Figure 2. The function of the gage 5 is todetermine how far, if at all, the insole shall project'beyond the edge of the heel seat of the last after the excess material has been trimmed, and it does this by holding the last more or less distant from the knife. The gage 5 is provided with a tongue 9 which extends between the bottom of the last and the projecting edge portion of the insole 15 so as to position the last relatively to the knife, and also to support the insole out of contact with the last adjacent to the point of operation of the knife. 1

The bracket 2 is provided with another guideway 20 within which is arranged a projection from an adjustable slide 22 which is provided with a clamp screw 13. The slide 22 carries an angularly arranged gage 2a which is adapted to support the bottom face of the heel seat portion of the insole on the last, and to co-operate with the gage 5 in positioning the last relatively to the knife. A bracket 25 is affixed to the gage2t and supports a sliding bolt 26 which is provided with a yoke 27 carrying a pin upon which turns a roller 28. A spring 29 surrounds the bolt 26, is confined between the bracket 25 and the yoke, and acts to press the roller through an aperture 10 in the gage'24: and against the face of the insole, to press and hold the latter in engagement with the last. The outer end portion of the bolt 26 is provided withsuitable lock and stop nuts 30 for limiting the extent of the inward movement of the roller.

In the use of the machine,-power will be applied through the belt 8 to rotate the lmife 6 at asuitable speed. An insole 15 having beenfastened temporarily to the bottom of a last, the last and insole are presented to the machine with the toe pointing up. and the heel breast portion of the insole located between the tongue 9 and the face of the gage 24:. The projecting marginal portion of the insole will thus be braced beyond the edge of the heel seat portion of the last, and the gage 5 will hold the last out of engagement'with the knife and will so position the last relatively to the knife as to determine I against the last and hold it in position during the trimming operation. The last will be manipulated by the operator so as to trim progressively along the edge of the insole about the heel seat, and the insole will be trimmed accurately to the contour of the last around the entire heel seat portion thereof. The work-engaging face of gage 24; is tangential to an arc rather than radial to the axis of the knife, and the trimmed edge will be beveled accordingly.

The sole-rest 24 and tongue 9 thus cooperate in guiding the insole relatively to the knife and the gage 5 and tongue 9 cooperate in guiding the last.

The tacks that are used to secure the insole to the last may be located in the shank and forepart, the roller 28 being suflicient to prevent the heel seat portion of the insole from slipping 'edgewise relatively to the last, without requiring a tack in the heel seat. This has the advantage that no tack comes into contact with the plate 24 on the roller.

The trimming knife is such that it can- 'not enter and leave the work so abruptly as to form shoulders on the sole, being in this respect a more desirable knife than those of the chopping type heretofore used for this operation.

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

1. A machine for trimming the heel-seat margin of an insole attached to a last, comprising a rotary knife having an endless annular cutting edge directed to cut substantially at right angles to the direction of movement of its edge, and means arranged to engage the last and the marginal portion of the insole so as to guide them in a direction substantially at right angles to said cutting edge.

2. A machine for trimming the heel-seat margin of an insole attached to a last, comprisin a knife having an endless cutting edge directed to cut substantially at right angles to the direction of movement of its edge, and means arranged to engage the last and the marginal portion of the insole so as to guide them in a direction substantially at right angles to said cutting edge.

3. In a machine for trimming an insole attached to a last, the combination with confronting sole-engaging abutments arranged to form a channel for the marginal portion of the sole and to engage the opposite faces of said margin to brace it against flexure, of a rotary trimming knife havin an annular cutting edge arranged to extend transversely of said channel so as to cut in one direction regardless of the direction means for engaging the side of the last to position the latter relatively to the knife, a work rest arranged to engage the heel seat portion of the insole, and a spring-pressed roll arranged to press the insole against the last.

6. In a machine for trimming an insole attached to a last, a rotary annular knife, means for positioning the work relatively to said knife comprising a sole-rest arranged to engage the heel seat portion of the insole, said sole-rest having an opening, a spring-pressed roll arranged to occupy said opening tohold said insole in engagement with the last, and means arranged to engage the side of the last to position the work relatively to the knife.

7. In a machine for trimming an insole attached to a last, a rotary annular knife, means for positioning the last relatively to the knife including a device to extend between the last bottom and the insole, said means being adjustable toward and from the axis of the knife, an adjustable solerest arranged to position the sole with its heel seat face parallel to the axis of said knife, and an anti-friction roller arranged to bear on the insole to sustain the drag of the knife.

8. A machine for trimming a last-supported insole, comprising, in combination, a rotary annular knife, means arranged to engage the side of the last to guide the latter relatively to the knife, said means being adjustable toward and from the axis of the knife, and an anti-friction roller arranged to bear on the heel seat face of the insole to sustain the latter against movement with the knife, said roller being adjustable relatively to said last-guiding means.

In testimony whereof I have signed my name to this specification.

THONIAS LUND.

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