US2243257A

US2243257A - Sewing machine

Info

Publication number: US2243257A
Application number: US280757A
Authority: US
Inventors: Alfred R Morrill
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1939-06-23
Filing date: 1939-06-23
Publication date: 1941-05-27
Anticipated expiration: 1958-05-27

Description

y 27, 1- A. R. MORRILL 2, 43,257

' SEWING MACHINE Filed June 23, 1939 6 Fig.4 1 2 via 40 Invgntoz 44 I 52 1 40 48 44 4 wa /WM Winess; M] m 4 v Patented May 27, 1941 SEWING MACHINE Alfred B. Merrill, Beverly, Mass, assignor to United Shoe Machinery Corporation, Borough of Flemington, N. .L, a corporation of New Jersey Application June 23, 1939, Serial No. 280,757

6 Claims. (Cl. 112-46) The invention relates to welt sewing machines such as are used in the sewing of the inseams of welted shoes, and more particularly to the provision of a novel and improved welt feeding device for use in a welt sewing machine of the general type in which the stitch forming and work feeding devices are constructed and arranged to impart a continuous feeding movement to the work. 7

The machine herein disclosed as embodying in a preferred form the several features of the invention, is similar to that fully illustrated and described in the prior patent to Morrill No. 1,971,575, dated August 28, 1934, having a work piercing needle and a work piercing awl located at one side of the work and movable in the line of work feed to continuously feed the work, a channel guide movable with the needle to assist in feeding the work, and supporting and actuating mechanisms for these parts.

In machines of this general description, it has been found that there is a tendency for the welt drawn off from the supply by the continuous action of the work feeding devices to interfere with the operation of the work feed. The dra resistance exerted by the welt, has been found particularly injurious during that portion of the sewing cycle in which the awl leaves the work, and the needle enters the work, as tending to cause the displacement of the previously formed awl hole with relation to the needle, with resultant tearing of the work and a tendency of the needle to be deflected from its normal operating path.

Applicant is aware that welt feeding devices have heretofore been employed in connection with step feed machines, such devices being normally arranged to slacken the welt between the supply and the welt guide as, for example, by flexing the welt laterally against the anchorage provided by the work supporting devices including the presser foot while the work is held stationary. Welt feeding devices of this general type operate to supply only such amounts of slack welt as may be needed from stitch to stitch during the progress of the sewing operation about the sole margin of the shoe.

It is a principal object of the present invention to provide a welt feeding device which may be of the general type referred to, but which is particularly constructed and adapted to cooperate in a novel manner with the stitch forming and work feeding devices to supply such amounts of slack welt as may be needed to insure a smooth and uninterrupted feed of the work in a continuous feed machine during the progress of the sewing operation about the shoe.

With this and other objects in view as may hereinafter appear, a principal feature of the invention consists in the provision of means for automatically slackening the welt between the work and the welt supply during the feeding movement of the awl, so that an amount of slack welt may be available during that portion of the sewing cycle in which the awl is withdrawn from the work and the needle enters the perforation previously formed by the awl.

Other features of the invention relate specifically to the construction and arrangement of the welt feeding devices to operate in the desired timed relation to the stitch forming and work feeding devices. In the illustrated construction, the motion of the welt slackening device is desirably achieved by means of a connection with the cam actuated stop lever of the machine which has a continuously reciprocating idling motion during the operation of the machine.

The several features of the invention consist also in the devices, combinations and arrangement of parts hereinafter described and claimed, which together with the advantages to be obtained thereby will be readily understood by one skilled in the art from the following description taken in connection with the accompanying drawing, in which Fig. 1 is a view in right side elevation of a portion of the machine head, only so much of the machine having been illustrated as is believed necessary to illustrate the connection of the present invention therewith; Fig. 2 is a detail plan view partly insection illustrating applicants welt feeding device and the connections for actuating the same from the stop lever of the machine, this view being taken on the line 2-2 of Fig. 1; and Figs. 3 and 4 are fragmentary detail views similar to Fig. 2, but illustrating different positions of the stitch forming and work feeding devices and illustrating the operation of the welt feeding devices with rela tion thereto. Y

The operating mechanism and stitch forming devices of the continuous feed welt sewing machine illustrated in the drawing, include a curved hook needle indicated at 6, an awl 8, a looper ID, a take-up (not shown), a thread finger l2, a welt guide [4, a channel guide It, and a back rest [8. The needle 6 and channel guide It are supported on a slide generally indicated at 29 for movement together in the line of feed. The awl 8 and its supporting lever arm 2| are similarly supported for movement in the line of feed on a slide generally indicated at 22. Inasmuch as the supporting and actuating means for these parts are identical with those of the construction illustrated and described in the Morrill patent above referred to, it is believed sufficient to point out that the feed slide 28 is positively driven from the main cam shaft 24 by means of two parallel lever arms, one of which is indicated at 26 supported to turn on a vertical stud 28, and arranged to be positively actuated by appropriate linkage and cam connections from the main cam shaft 24 of the machine, and the slide 22 is similarly actuated by a pair of lever arms, one of which is indicated at 29 supported to turn on a pivot stud 3! and arranged to 'be positively actuated by means of appropriate linkage and cam connections from the cam shaft 24 of the machine,

As in the patent referred to, the awl is a r--v ranged to engage with and to feed the work while the needle is withdrawn and isbeing back fed with the channel guide. Fig. 2 illustrates the positions taken by the parts at the beginning of the awl feed, and Fig. 3 the positions taken during the awl feed. The awl is then withdrawn, and the feeding movement of the shoe is continued by the channel guide IS during about 17 of revolution of the main cam shaft while both the needle and awl are out of the work, and prior to the engagement of the needle in the perforation formed by the awl, as shown in Fig. 4. The feeding of the work is then continued by both the channel guide and the needle as the awl is back fed to the initial position shown in Fig. 2.

In the illustrated machine, the welt is drawn from a convenient source of supply which may be a reel or coil of welting placed on the floor near the base of the machine, passing upwardly over a guide roll 34, and thence to the stitch forming and Work feeding devices. As shown in Fig. 1 of the drawing, there is also provided a welt measuring device which may be of ordinary construction, and comprises a friction shoe 3% which is arranged upon stopping the machine to grip the welt and to positively limit the amount of welt drawn from the supply by the operator in removing the shoe from the machine,

In accordance with the present invention, a Welt feeding device is provided which acts in timed relation to the stitch forming and work feeding devices to provide a supply of slack welt at the sewing point during the awl feed, which is then available during that portion of the sewing cycle when the awl is leaving and the needle enters the work, and while the work is being advanced only by the feeding movement of the channel guide It. This device comprises a U-shaped bracket 46 rigidly secured to the machine head, and having formed in the arms thereof guiding slots 42 and A l through which the welt passes from the supply to the idler pulley 34. Located between the arms of the bracket dii-isawelt feeding arm to secured to the lower end of a U-shaped bracket 48 which is pivotally supported on two axially aligned

vertical pivot studs

50 and 52. oscillatory movements are imparted to the U-shaped bracket st and welt feeding arm 4% in timed relation to the operation of the stitch forming and work feeding devices by means of a link 5A which is pivotally connected at one end to a laterally extending arm 56 formed on the upper end of the U-shaped bracket 48, and at its other end to one arm of the bellcrank stop lever 58 of the machine.

Inasmuch as the stop motion of the machine is identical with that described and illustrated in the Morrill patent above referred to, only so much of this mechanism will be described as is believed necessary to indicate the connection of the present invention therewith. The stop motion of the machine comprises a high speed drive including a main clutch for the machine, and a slow speed reverse drive including a secondary friction clutch and operating connections which are rendered operative upon release of the starting treadle of the machine to disengage the main clutch and to engage the secondary reverse clutch to arrest and, to reverse the operation of the operating parts, whereupon the secondary clutch is disengaged to stop the machine in a predetermined angular position with the needle withdrawn from the work. As shown in Fig. 2 of the.drawing, the reverse drive comprises a reverse driving clutch member BE! which is continuously driven through connections including a gearBZ formed on the external periphery of the clutch member 60. Cooperating with the clutch member 60 is a driven clutch member 64, which is keyed to and slidably supported on the drive shaft 24 of the machine. A sleeve cam track 66 formed on the sleeve hub of the driven clutch member 64 is arranged to receive a cam roll 68 mounted on a forwardly extending arm of the bell-crank stop lever 58. During normal operation of the machine, the stop lever 58 is permitted to oscillate freely following the path of the cam track 66. In stopping the machine, the bell-crank stop lever is arranged to be positively connected to a slide 72 by the insertion of a vertical stop pin supported thereon, with a corresponding hole in the under side of the laterally extending arm of the bell-crank 58, thus preventing further movement of the bellcrank 58, so that the roll 68 riding in the cam track 66 will then operate to move the driven clutch element 64 into operating engagement with the reverse driving clutch member 68. As the main cam shaft 24 is now stopped and reversed by the frictional engagement of the

clutch members

60 and 64, the clutch is again disengaged to stop the machine in the desired position.

In accordance with the present invention, the idling oscillatory movement of the bell-crank stop lever 58 during machine operation, is employed to secure the desired timed relation in the operation of the Welt feed arm 46 to slacken the welt While the awl 8 is engaged with and feeding the work, and thereafter to release the welt, so that slack welt is available during that portion of the stitch forming and work feeding cycle in which the awl is withdrawn and the needle enters the work, and particularly during the time when the work is being fed solely by the advancing movement of the channel guide is in the line of feed.

. The operation of applicants welt feeding device is specifically illustrated in Figs. 2, 3 and 4 of the'drawing. As shown in Fig. 2, the welt feeding arm 46 is in its retracted position at the start of the awl feed. During the movement of the awl to feed the shoe, as shown in Fig. 3, the welt feeding arm 46 is rapidly advanced, forming a bend in the welt between the upper and lower guides of the bracket 40, and thus drawing off additional welt from the supply against the moving anchorage provided by the engagement of the awl inthe work. As the awl is now withdrawn from the work, the welt feeding arm 46 is again moved to its retracted position, giving up the slack welt thus supplied to the work. Slack welt is thu made available during that portion of the stitch forming and work feeding cycle in which the needle and awl are withdrawn from the work, and the feeding movement of the shoe is continued solely by the feeding action of the channel guide, and before the needle enters the perforation previously formed by the awl, see Fig. 4.

The slack welt thus provided insures the continued even feed of the shoe by the channel guide, so that the work, and more particularly the perforation previously formed by the awl, will be properly located to receive the descending needle.

It will be understood that the invention is not limited to the specific embodiment shown, and that various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

What is claimed is:

1. A welt sewing machine having, in combination, stitch forming and shoe feeding mechanism arranged for continuously feeding the work including a work piercing needle and a work piercing awl movable in the line of work feed, and an additional work engaging element movable in the line of work feed to assist in feeding the work, a welt guide, and an intermittently acting welt pull-off for supplying comparatively slack welt between the welt supply and the sewing point, the action of the welt pull-off being timed with relation to the stitch forming and shoe feeding mechanism so that said slack welt is available during that portion of the cycle in which the awl leaves and the needle enters the work.

2. A welt sewing machine having, in combination, stitch forming and shoe feeding mechanism arranged for continuously feeding the work, including a work piercing needle and a work piercing awl movable in the line of work feed to alternately feed the work, and an additional work engaging element movable in the line of work feed to feed the work as the awl is withdrawn and the needle enters the work, a welt guide, and an intermittently acting welt pull-off for supplying comparatively slack welt between the welt supply and the sewing point, the action of the welt pull-oft being timed with relation to the stitch forming and shoe feeding mechanism so that said slack welt is available during that portion of the cycle in which the awl leaves and the needle enters the work.

3. A welt sewing machine having, in combination, stitch forming and shoe feeding mechanism arranged for continuously feeding the work including a work piercing needle and a work piercing awl located at the same side of the work and movable in the line of shoe feed, and a channel guide movable in the line of shoe feed to assist in feeding the work, a welt guide, and means for automatically slackening the welt between the Welt guide and the welt supply during the awl feed and prior to the withdrawal of the awl from the work.

4. A welt sewing machine having, in combination, stitch forming and shoe feeding mechanism arranged for continuously feeding the work including a work piercing needle and a work piercing awl movable in the line of work feed, and a work engaging element movable with the needle to assist in feeding the work, a welt guide, a welt pull-off, and means for actuating the pulloff to intermittently pull and slacken the welt during that portion of the sewing cycle when the awl is feeding the work so that slack welt is available at the sewing point as the awl leaves and the needle enters the work.

5. A welt sewing machine having, in combination, stitch forming and shoe feeding mechanism arranged for continuously feeding the work and including a work piercing needle and a work piercing awl movable in the line of work feed, and. a shoe supporting element movable with the needle to feed the work, a stop mechanism for the machine including a continuously reciprocated idling stop lever, a welt guide, and a welt pull-off between the welt guide and the welt supply and connected with the machine stop lever, said pull-off acting during the awl feed to provide slack welt which is then available at the sewing point when the needle enters the work.

6. A welt sewing machine having, in combination, stitch formin and shoe feeding mechanism arranged for continuously feeding the work including a work piercing needle and a work piercing awl mounted at the same side of the work for movement along the line of work feed, and a channel guide movable with the needle to assist in feeding the work, a welt guide, welt guiding devices between the welt guide and the welt supply, and a welt pull-01f engaging the welt between the guiding devices, a stop mechanism for the machine including a stop motion lever having a continuously reciprocatory idling movement, and a connection between the stop lever and the welt pull-off for intermittently reciprocating the pull-01f to pull and to slacken the welt while the awl is engaged in the work.

ALFRED R. MORRILL.