US2010719A - Shoe sewing machine - Google Patents

Description

1935- R. E. HOPKINS 2,010,719

SHOE SEWING MACHINE Filed Oct. 25, 1953 a i 1 4-7 \x 4a 1+ r 52 O /26 56 0 i f 16 1a 56 52 UNITED STATES. "PA EN F FICEH snot: SEWING MACliINE J Raymond E. Hopkins,

Rockland, Mass, assignor to United Shoe Machinery. Corporation, Paterson, N. J a corporation of'New J ersey Application October 25,

1933, Serial N6. 695,136

'7 Claims. (oi; 1125-51) .The present invention relates to improvements in work guiding and channel forming devices for shoe sewing machinesand is herein disclosed as embodied in a sewing machine of the McKay type having a rotary shoe supporting horn and a reciprocating straight hook needle.

. It is common practice to employ an edge gage on the work support of a sewing machine for spac ing the seam uniformly the desired distance from the edge. An edge g age on a McKay shoe sewing ,machine cai'motbe supported on the work supporting horn of the machine because in supporting the shoe the horn is entirely surrounded by the shoe upper. The usual location for an edge gage on this type of presser-foot where, chine,

machine, theref ore, is due to the nature of the mathe manner of connection and adjustment on the has heretofore occasioned. considerable difficulty. This difficulty is most troublesome on machines used in repair work sizes of shoes operated upon require the position of the edge gage.

justment of where .difierent styles and frequent ad- It is also desirable for certain kinds of work to provide a groove in the outer v conceal the stitches.

knife is mounted on surface of the shoe. sole to When a work channelling groove during operation of the stitch-forming devices, it also may int erfere with the operation of the stitch-forming devices so as to cause'irregularities in the seam and unequal spacings of the seam from the edge of the-sole.

The objects of the invention are to provide novel and improved constructions andarrangements of parts including an e knife on this type ,of readily be adjusted dge gagel and a channelling sewing machine whichmay for different .operatingrequirements as desired when used for repair work and, accordingly,

a feature of the invention contemplates the provision, in a McKaytype sewing machine having an edge gage .of a threaded shaft on the presser-foot, on the presser-foot, so arranged as not to interfere with the operation of :the machine, for adjusting the position of .the

edge gage relatively the stitch forming devices.

to the point of operation of In the specific embodiment of the invention as hereinafter illustrated,

on a threaded block the edge gage is mounted slidable in a slot-extending transversely to the line of feedpin the presser-foot and the threaded sh 'foot lengthwise of the slot, engages aft, mounted on thepresser the threaded opening in the block to adjustably secure it in position. Convenient means is also provided for rotating the shaft to shift the edge gage sup- ;porting block along the, transverse. slot of. the

the'machine to form the presser foot. By so arranging the threaded shaft the thickness of theedge gage supporting portion of the presser-v-foot'is not increased in weight and thicknessto such an extent as tointerfere with proper operation of the machine and the position i 5 of the edge gage may readily be adjusted even while the presser foot engages the work.

The above and other features of the invention, comprising a novel and'improved work channelling-knife for use with a machine of the type described, will; be apparent to those skilled in .the art from the following description taken in connection. with. the accompanying drawing; in which,;Fig. 1 is .a view infront elevation of a. portion of a sewing machine embodying the fea- '15 'tures of the present inventiomFig. 2 is a view in side elevation of some of the parts illustrated in Fig. 1; Fig. 3- is a. detail view on an enlarged scale, partly in sectionof a portion of the machine; Fig.4 isa detail plan View of the presser-foot of the machine; Fig. 5 is a sectional view taken along the line. 5--5 ofFig. 4; .Fig. .6 is a detail view in front elevationof the presser-foot; and Fig. 'l is a detailyview in side elevation of the presserfoo'r. i,

In the machine illustrated, the shoe, indicated at H), is supported on a work supporting horn l2 having' a needle threading whirl at its upper end. The shoe is operated upon bystitch forming devices comprising a reciprocating straight hook needle M, a shuttle Ilia-feed point l8, and a presser-foot 20. The presser-foot 20 acts to secure thework against the tipof the horn l2 during operationof the needle. The shoe is intermittently released from the presser-foot, and moved inthe line of. feed by the feed point 18 in substantially the same-'manner, except as hereinafter described, as in the machine described in the U. S. Patent to ,Leveque, No. 1,885,927, grantedNovember 1, 1932. The presser-foot 20 is provided'with a work channelling knife 22 and an edgegauge 24. e '1 In the embodiment of the invention as herein illustrated, the edge gauge 24 is in the form of a roll mounted to rotate about a vertical axis on a 4:5 screw 26 extending through a washer 21 and the rol1,-and engaging a threaded, opening in a block 28; The block!!! is slidingly fitted in a slot 30 in a laterally extending portion 32 of the presser foot. The block 28 is secured within the slot 30 of the presser toothy thethreaded portion of a screw 34 loosely supportedin horizontal bearings in;the presser foot, andarranged lengthwise of the slot 30;, The screw 34 extends through a threaded opening inthe block 28, and when the screw is rotated the block is caused to move along the slot. To prevent lengthwise movement of the screw, the head of the screw is engaged in a shouldered recess 35 in the presser foot, and a nut 38 threaded onto the other end of the screw engages the outer surface of the laterally extending portion 32 of the presser foot. To rotate the screw, the nut 38 is knurled about its circumferential surface, and a lock nut 4|] threaded on the screw 34 frictionally engages the nut 38.

The edge gage roll is located, in the direction of feed, between the points of engagement of the channelling knife 22 and the feed point l8 with the shoe, the movement of the shoe in the direction of feed being so guided that the smallest possible amount of movement at an angle to the line of feed will take place in the work at both points of engagement of the feed point and the channelling knife when operating along the curved edge of the shoeat the toe. To prevent marring the edges of the workwhen the presser foot is raised. and lowered during operation of the machine, the edge gage roll is bevelled about its circumference and presents a smooth curved surface against which the work is pressed.

In order to adapt the machine for use in repairing shoes having the heels attached, particularly women's high heeled shoes, the. manner of mounting the presser. foot on the machine of the Leveque patent has been changed to provide greater clearance for high heels and to permit sewing closer to the heel of the shoe than with the Leveque machine. The presser foot in the present machine issecured to one end of a re.- eiprocating presser foot bar 42 by a screw 44 passing through a slot 46 in the presser foot into a threaded opening in the bar. To prevent rotation about the screw 44, the presser foot is slotted and is engaged by a tongue 41 on the presser foot bar. The presserifoot bar is resiliently moved downwardly against the work by an arm 48 in which is mounted a stud 50 connected with the presserfoot bar by a link 52 pivoted at its upper end on the stud 50 and at its lower end to a second stud 54 secured in anrenlargement of the presser foot bar 42. The presser foot is also provided with a portion 56 for compressing the seam to force-the material of the shoe against the stitches and close the channel formed by the channelling knife 22.

Due to the necessity in machines of the McKay type of operating the needle,feed point, and presser foot from the outer side of a'shoe sole which is supported by the rotary horn engaging the inside surface of the sole, the cutting action of the channelling knife '22 must take place during each cycle at some time at which it will not interfere with the operation of the other devices. While the work is released by the presser foot, the feed point l8 acts to advance the work in the line of feed, but the force imparted to the work by the feed point is not great enough in this type of machine to provide reliable cutting action when the knife is arranged to cut during the feeding movement. a r

To permit the knife to operate uniformly,'the presser foot'of the machine, herein illustrated, is raised somewhat higher than in the machine of the patent above referred to so that the shoe will be substantially relieved from the dragging action of the knife during the feeding movement.

At the end of the feeding movement of the shoe, while the feed point still remains in engagement with the work, the presser foot is moved .ted portion of the portion of the presser foot downwardly, causing the knife to form a uniform groove of a depth equal to the distance below the under surface of the presser foot by which the knife projects. To regulate the horizontal position of the knife 22 on the presser foot, the knife is secured to the presser foot by a screw 58 passing through an elongated slot 60 in the knife and into the presser foot. The presser foot is also formed with a slot 62 into which a rib on the channelling knife extends for preventing relative angular movement of the knife and presser-foot. When the screw 53 is loosened, the knife 22 may be shifted on the screw to the desired position.

The nature and scope of the invention having been indicated, and a machine embodying the several features of the invention having been specifically described, what is claimed is:

1. A shoe sewing machine having, in combination, a rotary horn, a straight hook needle, a feed point, a presser foot for securing the work against the horn, an edge gage, an edge gage support mounted to slide on the presser foot to position the edge gage relative to the point of operation of the needle in the work, and a threaded shaft engaging the edge gage support to adjust when rotated the position of the edge gage support in its mounting on the presser foot.

2. A shoe sewing machine having, in combination, a rotary horn, a straight hook needle, a feed point, a presser foot having a slotted portion extending transversely to the line of feed, a block provided with a threaded opening, a rotatable threaded shaft extending lengthwise of the slotpresser foot and engaging the threadedopening in the block for holding the block in the slotted portion, an edge gage carried by the block, and means for rotating the threaded shaft to shift the edge gage towards and from the point of operation of the needle.

3. A shoe sewing machine having, in combination, a rotary horn, a straight hook needle, a feed point, a presser foot having a slotted portion extending transversely to the line of feed, a block provided with a threaded opening and guided by the slotted portion of the presser foot, a rotatable threaded shaft extending lengthwise of the slotted portion and engaging the opening in the block to hold the block in the slotted portion, an edge gage roll rotatably mounted on the block for guiding the edge of the work, and an adjusting member on the threaded shaft at a point readily accessible while the work is secured by the presser foot for rotating the rod to shift the edge gage roll towards and from the point of operation of the needle. 7

4. A shoe sewing machine having, in combination, a rotary horn, a straight hook needle, a feed point, a presser foot having a slotted portion extending transversely to the line of feed, a work I channelling knife on the presser foot for forming a stitch receiving groove in the work in advance of the point of operation of the needle, a block provided with a. threaded opening, a rotatable threaded shaft arranged lengthwise of the slotted and engaged in the threaded opening in the block for holding the block in the slotted position, an edge gage carried by the block, and means for rotating the threaded shaft to shift the edge gage towards and from the channeling knife.

5. A shoe sewing machine having, in combination, a rotary horn, a straight hook needle, a feed point, a presser foot having a slotted portion at one side extending transversely to the line of feed, a work channeling knife on the presser foot for forming a stitch receiving g'roovein the work in advance of the point of operation of the needle, means on the other side of the presser foot for compressing the seam, a block provided with a threaded opening, an edge gage carried by the block, a rotatable threaded shaft arranged lengthwise of the slotted portion of the presserfoot and engaged in the threaded opening in the block for holding the block in the slotted portion, and means projecting beyond the slotted portion of the presser-foot comprising means for rotating the threaded shaft to shift the edge gage towards and from the channeling knife.

'6. A shoe sewing machine of the McKay type having, in combination, a rotary horn arranged to extend within and support a. shoe being operated upon, stitch forming and work feeding devices acting on the outside of the shoe sole and including a straight hook needle, 2. presser foot movable towards and from the outer side of the sole to intermittently clamp and release the shoe on the horn, a feed point for feeding the shoe when released by the presser foot, and a work channelling knife on the presser-foot for forming a uniform stitch receiving groove in the outer side of the shoe sole when the presser foot moves against the shoe and for disengaging the shoe during the feeding movement of the feed point.

'7. A shoe sewing machine of the McKay type having, in combination, a rotary horn arranged to extend within and support a shoe being operated upon, stitch forming and work feeding devices acting on the outside of the shoe sole and including a straight hook needle, a presser movable towards and from the outer side of the sole to intermittently clamp and release the shoe on the horn, a feed point for feeding the shoe when released by the presser-foot, a work channelling knife on the presser foot for forming a uniform stitch receiving groove in the outer side of the shoe sole when the presser foot moves against the shoe and for disengaging the shoe during the feeding movement of the feed point, and means carried by the presser foot to close the channel over the seam formed by the stitch forming devices.

RAYMOND E. HOPKINS.

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