US2038282A - Shoe sewing machine - Google Patents

Description

SHOE SEWING MACHINE Original Filed Jan. 14, 1935 3 Sheets-Sheet 1 Fig.1

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Patented Apr. 21, 1936 SHOE SEWING MACHINE Otto R. Haas, North Beverly, Mass., assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Original application January 14, 1933, Serial No. 651,803. Divided and this application January 5, 1935, Serial No. 545

16 Claims. (Cl. 117-47) The present invention relates to lockstitch shoe sewing machines for connecting the outsole with the welt, lasted upper and insole of a. Goodyear welt shoe, the illustrative embodiment of the invention being of the same construction and operation as that of the machine described in applicants pending application Serial No. 651,803, filed January 14, 1933, of which the present application is a division.

The object of the present invention is to improve the construction, arrangement, and mode of operation of the stitch forming parts of outsole shoe sewing machines.

With the'above and other objects in View, as

' will hereinafter appear, certain features of the present invention contemplate the provision in an outsole shoe sewing machine of a new and improved carrier stud construction upon which a needle supporting segment is mounted for oscillating and feeding movements; a new and improvedmechanism, in a machine having the needle and awl segments and a needle guide, all

mounted to oscillate upon a single stud, for operating the needle guide through friction from the needle segment, and when so arranged for modifying by engagement with some other member of the stitch-forming devices, such as the thread arm, the operation of the needle guide to cover the barb of the needle as soon as the thread has been withdrawn, and a new and improved arrangement for providing support for the end of the needle while feeding the work by operating the needle threading looper in suitable timed relation to the other stitch forming and work feeding movements.

These and other features of the invention, including certain novel and improved constructions and arrangements of parts are hereinafter described in the following detailed specification, and are more particularly pointed out in the appended claims.

In the drawings, Fig. l is a view in side elevation and in section of a sewing machine embodying the features of the present invention; Fig. 2 is a plan view partly broken away and in section of the front part of the machine; Fig. 3 is an enlarged view in elevation and partly in section of the stud on which the needle and awl segments of the machine are mounted and of the adjacent parts; Fig. 4 is a detail View in section of the needle and awl mounting stud and its oscillating segment; Fig. 5 is an end View of the needle and awl stud oscillating segment shown in Fig. 4; and Fig. 6 is a sectional view of the stud shown in Fig. 4 taken at right angles to the section shown in that figure.

The sewing mechanism of the machine embodying the present invention is substantially the same except as hereinafter described, as in the machine of applicants co-pending application Ser. No. 600,016, filed March 19, 1932, for Shoe sewing machines. The machine illustrated is operated from a sewing cam shaft in to actuate the stitch-forming and work feeding devices of the machine including a curved hook needle l2, a curved awl 14, a looper I6, a shuttle or loop taker 18, a thread finger 20, a needle guide 22, a work support 24, a presser foot 26 and a feed slide 28 on which certain of the stitch-forming devices are carried. The stitch-forming and work-feeding devices are constructed and arranged to impart a continuous feeding movement to the work as in the machine of applicants co-pending application Serial No. 600,016, and to this end the work support and presser-foot are mounted upon a laterally sliding carriage or feed slide, and the needle and awl are also mounted upon the carriage but, at certain times during the stitchforming and work-feeding cycle, are moved in the line of feed independently of the carriage. The back feed of the feed carriage takes place while the needle is in the work and the awl is arranged to enter the work after the back-feed of the feed carriage has been completed and after the needle has withdrawn from the work with its loop of thread.

According to a feature of the present invention the awl segment, indicated at 30 (see Fig. 3) and the needle segment, indicated at 32, as in the machine of application Serial No. 600,016 referred to, are mounted for movement in the line of feed independently of thefeed slide 28 on which they are supported. These segments are separately oscillatable and are mounted with the needle and awl in fixed alinement on a carrier stud 34 having at one end a threaded portion 36 engaging a threaded bearing 38 formed in the slide 128. The needle is secured for convenient replacement on the segment 32 by a clamp member 30 between which and the segment there is provided a clamp releasing spring 42. The other end of the stud 34 is supported in a plain bearing 44 in a fixed part of the machine frame 46 which bearing is engaged by the sleeve of the awl segment. Feed ing movement of the feed slide is effected by the cam shaft through a cam lever 48 adjustably connected to the feed slide 28 by links 50. The stud with the needle and awl are independently movable in the line of feed relatively to the feed slide 28, by rotation of the stud in the threaded bearing 38 through the engagement of a segment 52 extending from the stud with the teeth of a corresponding segment 54 fixed to a short horizontal shaft 56 in the front portion of the sewing frame. The shaft 56 is oscillated by an arm 58 secured to the other end of the shaft, the arm 58 being actuated through a link 60 connected between the arm 58 and one end of a lever 62 operated by a cam on the sewing cam shaft.

It is desirable that the carrier stud 34 on which the needle and awl segments oscillate be as short as possible while providing suflicient bearing areas to properly support the moving parts; The thread on the threaded portion 36 of the stud .is, therefore, extended from the extreme end of the stud to the shoulder formed by the segment 52, and preferably the thread is of full depth up to this shoulder.

According to the construction illustrated in Figs. 4, 5, and 6, the segment 52 on the carrier stud is formed separately and secured to the carrier stud, in order that the thread on the threaded portion 36 of the stud may be accurate and of full depth. The stud 34 is reduced in diameter and is in the form of a bolt having its threaded journal portion 36 at one end, a thread at the other end to accommodate a nut 54, and an abrupt shoulder between the journal portion and the unthreaded portion. The segment 52 is formed with an extended sleeve portion surrounding the stud 34 throughout the entire length of the reduced portion, which sleeve provides support for the needle and awl segments. The stud 34 is connected for rotation with the segment 52 by a tongue 66 on the stud and a slot in the end face of the segment. The tongue 66 extends axially from the shoulder between the threaded portion 36 and the reduced bolt portion of the stud, so that when the nut 64 together with a washer 68 are applied to the stud, the tongue will be clamped within the slot in the segment, and the threaded portion extending beyond the segment will be of full depth to the end face of the segment. The washer 68 extends radially beyond the outer surface of the stud to retain the needle and awl segments and the needle guide in fixed relation longitudinally of the stud.

In order to provide more space for the operating connections for the needle and awl segments, and to permit a greater movement of the needle, the needle guide 22 which, in the machine of application Serial No. 600,016, was driven positively from a cam actuated part, in the present machine is driven from the needle segment 32 by friction. The needle guide is actuated positively by the thread finger 28 to cover the empty barb of the needle as soon as the thread has been withdrawn. The position of these segments has been reversed on the stud 34 from those in the machine of application Serial No. 600,016, in order that the needle guide may be located close to the thread finger. The needle segment 32, therefore, is disposed at the left hand side of the awl segment 3!), and is formed with an arcuate inner surface 10, shown in Fig. 1, against which a shoe 12 mounted on the needle guide is compressed. A stud 74 extending from the shoe 12 engages a bore in an arm 76 of the needle guide, and compresses a coil spring 18 against the end of the bore. The frictional engagement produced by the spring between the shoe i2 and the surface it causes the needle guide to follow the movements of the needle until the needle guide contacts with a surface 80 on the presser-foot. Thereafter the needle guide remains stationary, and the needle continues its movement through the work.

The lowermost position of the needle guide by this construction is determined by the position of the presser-foot on the work. The stitch forming devices which act to produce a continu ous feed of the work are so timed that the presserfoct and work support will be back fed while the needle engages the work and while the needle guide supports the needle close to the surface of the work. As in the machine of the above identified application Serial No. 600,016, the presserfoct is raised during sewing at the first portion of each back feeding movement. In order to facilitate raising the presser-foot, the surface 80 of the presser-foot which the needle guide engages (see Fig. 3) is inclined at an angle, and a correspondingly inclined surface 82 on the needle guide permits the presser-foot to be raised with a minimum amount of interference with the needle guide as the presser-foot moves against the direction of feed and away from the needle guide.

During the retracting movement of the needle, the needle guide moves vertically away from the presser-foot until a stop arm 84 (see Fig. l) on the needle guide engages a projection 86 extending laterally from a portion of the thread finger. The needle guide then remains stationary until the needle is fully retracted, and after the thread has been withdrawn from the barb of the needle, the thread finger is moved rearwardly by its actuating lever 88, causing the projection 86 on the thread finger to shift the needle guide over the barb of the needle, as shown, so that the loop of needle thread in passing over the shuttle will not become entangled with the open barb. In order that the needle guide may not be carried beyond the end of the needle, a shoulder 90 is provided on the needle segment in a position to engage the end of the stop arm 84 on the needle guide.

To insure that the needle guide 22 will move with the needle and will not momentarily shift its position from covering the needle barb in spite of the action of the friction shoe I2 as the needle is accelerated in its movement towards the work, means is provided for actuating it positively during a part of the needle stroke. To this end the thread finger 20 is given a further short rearward stroke causing the needle guide to be accelerated as fast as the needle. The needle barb will thus remain covered until the needle guide strikes the presserfoot and the needle engages the work even though the machine is operated at extremely high speeds.

While the work support and presser-foot are being back-fed, as shown in Fig. 3, the needle. which, at this time, is through the work, is supported at its lower end against the thrust of the work, produced by the frictional reaction of the Work on the work support, by the loop of thread which is laid within the barb of the needle by the looper before the work is released by the presserfoot. In laying the loop within the needle barb,

the thread is first grasped by the thread finger 20,

the looper then moving forwardly of the machine and against the direction of feed toward the needle, and then rearwardly of the machine round the needle and in the direction of feed to exert a strain on the needle. The strain is maintained throughout the entire back-feeding movement of the work support and presser-foot, so that the needle may not flex or become broken, and the distance between stitches in the work will be uniform.

To permit the use of a comparatively short geared portion on the needle segment, a pair of idler gears 92 and 94 (see Fig. 1) are rotatably mounted on bolts 96 secured on the feed slide 28 to mesh with the needle segment in either of its extreme positions. The idler gears 92 and 94 are driven by a segment 98 fulcrumed on a hollow shaft I in the frame of the machine, so that during the feeding movements of the feed slide and of the stud 34, the idler gears 92 and 94 may move in the line of feed relative to the segment 98, and the needle segment may also move relative to the idler gears in the feed slide. The segment 98 is oscillated by a cam follower carried by an arm I02 extending from the segment.

The shuttle I8 of the illustrated machine is similar to the shuttle of applicants co-pending application Serial No. 600,016, and is driven from the main sewing shaft I 0 through a second shaft I04 extending toward the front of the machine. The outer end of the second shaft carries a gear I06 meshing with gear teeth formed about the edge of the shuttle I8.

To prevent breakage of the driving connections between the sewing shaft and the shuttle, in the present embodiment of the invention, the gear I06 at the outer end of the shaft I04 is constructed in the form of a ring having a flange extending radially inwardly towards the center of the gear, as shown in Fig. 1. The ring is positioned at the end of the shaft I04 by a disk I08 at the end of the shaft fitting within a circular recess at one side of the flange. A plate IIO fits at the other side of the flange, and the parts are secured by screws I I2 passing through the plate and the central opening in the ring gear and en.- gaging the disk at their threaded ends. The force exerted by the screws ordinarily prevents rotation of the ring gear relative to the shaft I04, but in case of obstruction by thread jamming the shuttle or otherwise, the flange on the gear ring will slide between the plate and the disk without injuring theparts. The screws I I 2 are also readily accessible at the front of the machine adjacent the shuttle for readjusting the timing of the shuttle in case the gear is displaced.

The nature and scope of the invention having been indicated and a specific embodiment illustrating the several features of the invention having been described, what is claimed is:

1. A sewing machine having, in combination, stitch-forming and work-feeding devices including a stud provided with a screw threaded portion engaging a screw threaded bearing in the machine, a curved hook needle, a needle segment mounted to oscillate on the stud, means for supporting the needle segment in fixed relation longitudinally of the stud, and a separately formed stud oscillating segment secured to the stud at one side of the screw threaded portion and having a shoulder to which screw threads of the screw threaded portion of full depth extend.

2. A sewing machine having, in combination, stitch-forming and work feeding devices including a stud provided with a screw threaded. portion engaging a screw threaded bearing in the machine, a curved hook needle, a needle segment mounted to oscillate on the stud, means for supporting the needle segment in fixed relation longitudinally of the stud, and a separately formed stud oscillating segment having a sleeve portion surrounding the unthreaded portion of the stud to form a radial bearing for the needle segment and having a shoulder to which screw threads of the screw threaded portion of full depth extend.

3. A sewing machine having, in combination, stitch-forming and work feeding devices including a stud provided at one end with an enlarged screw threaded portion engaging a screw threaded bearing in the machine and formed with a tongue adjacent the shoulder between the enlarged portion of the stud and the remaining portion, a curved hook needle, a needle segment mounted to oscillate on the stud, means for supporting theneedle segment in fixed relation: longitudinally of the stud, and a separately formed segment having a slotted face engaging the tongue on. the stud for oscillating the stud in the threaded bearing to feed the work.

4. A sewing machine having, in combination, stitch-forming and work-feeding devices including a stud provided at one end with an enlarged screw threaded portion engaging a screw threaded bearing in the machine and a reduced portion,

threaded at the other end, a tongue extending axially from the enlarged: threaded portion at the shoulder formed thereby, a curved. hook needle, a.

needle segment mounted to oscillate on the stud, a separately formed segment having a sleeve portion to forma radial bearing for the needle segment surrounding the reduced portion of the stud, said separately formed segment having a slotted face engaging the tongue on the stud for oscillating the stud in the threaded bearing to feed the work, and means comprising a nut at the reduced threaded end of the stud for securing the stud and segment with the sleeve portion in fixed relation and. for preventing movement of the needle segment longitudinally of the stud.

5. A lockstitch sewing machine having, in combination, a loop taker, a carrier stud, a curved.

hook needle, a curved awl, needle and awl segments and a needle guide mounted to oscillate on the stud, means for supporting the needle and awl segments in fixed relation longitudinally of the stud, and means for operating the needle guide frictionally from the needle segment to cause the needle guide to support the needle adjacent the work as the needle moves forwardly into the work, a thread arm, and a connection between the needle guide and the thread arm for shifting the needle guide on the needle to cover the open barb after the loop of needle thread has been taken therefrom.

6. A sewing machine having, in combination, stitch forming devices including a curved hook needle and a loop taker, a needle guide, a needle segment in which the needle is mounted, means for frictionally driving the needle guide from the needle segment, and means for moving the needle guide tocover the empty hook of the needle after the loop of needle thread has been taken from the hook and for thereafter actuating the needle guide to move with the needle.

'7. A sewing machine having, in combination, stitch forming devices including a curved hook needle, a looper, a thread arm, and a loop taker, a needle guide, a needle segment in which the needle is mounted, a friction shoe carried by the needle guide and engaging the needle segment to drive the needle guide from the segment, and means for actuating the thread arm to move the needle guide over the empty book of the needle after the loop of needle thread has been taken from the hook, and thereafter to cause the needle guide to move with the needle before it engages the work.

8. A sewing machine having, in combination, a carrier slide mounted to reciprocate in the line of feed, a work support, a presser-foot and a thread arm on the slide, a stud provided with a screw thread engaging a screw threaded bearing in the slide, needle and awl segments and a 1 ment to cause the needle guide to follow the movements of the needle toward and away from the work.

9. A lockstitch sewing machine having, in combination, a carrier slide mounted to reciprocate in the line of feed, a work support, a presserfoot and a thread arm on the slide, a stud provided with a screw thread engaging a screw threaded bearing in the slide, needle and awl segments and a needle guide mounted on the stud, mechanism for reciprocating the slide and for oscillating the stud in timed relation to produce continuous feed of the work, means for driving the needle guide from the needle segment, a loop taker, and a connection between the needle guide and the thread arm arranged to shift the needle guide on the needle to cover the open barb after the loop of needle thread has been taken therefrom.

10. A lockstitch sewing machine having, in combination, a carrier slide mounted to reciprocate in the line of feed, a work support, a presserfoot and a thread arm on the slide, a stud provided with a screw thread engaging a screw threaded bearing in the slide, needle and awl segments and a needle guide mounted on the stud, mechanism for reciprocating the slide and for oscillating the stud in timed relation to pro duce continuous feed of the work, means for driving the needle guide from the needle segment, a loop taker, a connection between the needle guide and the thread arm arranged to shift the needle guide on the needle to cover the open barb after the loop of needle thread has been taken therefrom, and a stop on the needle segment for preventin relative movement of the needle guide by the thread arm beyond the point of the needle.

11. A lockstitch sewing machine having, in combination, a carrier slide mounted to reciprocate in the line of feed, a work support, a presserfoot and a thread arm on the slide, a stud provided with a screw thread engaging a screw threaded bearing in the slide, a gear segment secured to the stud, a curved hook needle and a curved awl, means for threading the needle, needle and awl segments and a needle guide mounted to oscillate on the stud, means for supporting the needle and awl segments in fixed relation longitudinally of the stud, a cam shaft for oscillating the needle and awl segments, mechanisrn operated from the cam shaft for reciproeating the carrier slide, a gear segment operated from the cam shaft for oscillating the stud in timed relation to the reciprocating movement of the carrier slide to produce continuous feed of the work, a connection between the thread arm and the needle guide for shifting the needle guide relative to the needle, a loop taker, and means on the cam shaft for causing the thread arm to retract before the needle is threaded and for causing the thread arm to move'the needle guide over the open needle barb after the loop of needle thread has been taken from the needle.

12. A shoe sewing machine having, in com bination, stitch-forming and work feeding devices including a curved hook needle, movable laterally of the machine along the line of work feed, a work support, a work clamping presser foot, mechanism for operating the presser foot to release the work and for moving the needle while through the work laterally in the line of feed relatively to the work support, and means acting to support the needle at its end during the entire time that the work is released from the presser-foot. V

13. A shoe sewing machine having, in combination, stitch-forming and work feeding devices including a curved hook needle, movable laterally of the machine along the line of feed, a needle looper, a work support and a work clamping presser-foot, and mechanism for operating the presser-foot intermittently to release the work, and means for moving the needle laterally in the line of feed relatively to the work support during each stitch-forming cycle of operation to feed the work and for actuating the looper forwardly and rearwardly to lay the thread within the barb of the needle before the presser-foot is operated to release the work.

14. A shoe sewing machine having, in combination, stitch-forming and work-feeding devices including a work support, a work clamping presser-foot, a curved hook needle, mechanism for operating the presser-foot intermittently to release the work and for relatively moving the presser-foot and needle during each stitch-forming cycle of operation to feed the work while the needle engages the work, and a needle guide arranged to engage the presser-foot while the needle engages the work, said needle guide and presser-foot having parallel engaging surfaces disposed at an angle to the direction of feed for permitting release of the presser-foot from clamping relation with the work without interiering with the needle guide as the presser-foot is moved away from the needle guide.

15. A shoe sewing machine having, in combination, stitch-forming and work feeding devices including a work support, a work clamping presser-foot, a carrier movable laterally of the machine along the line of work feed, a curved hook needle mounted on the carrier for movement toward and from the work, mechanism for operating the presser-foot intermittently to release the work and for moving the carrier while the needle engages the work in the direction of feed to feed the work, and a needle guide mounted on the carrier for movement against the presser-foot while the work is clamped thereby, said needle guide and presser-foot having engaging surfaces disposed at an angle to the direction of feed for permitting release of the presser-foot from clamping relation with the work without interfering with the needle guide as the carrier is back fed.

16. A sewing machine having, in combination, stitch forming devices including a carrier slide mounted to reciprocate in the line of feed, a work support and a presser-foot on the slide, a stud, needle and awl segments on the stud, mechanisms for reciprocating the slide and for reciprocating the stud on the slide in timed relation to produce continuous feeding movement of the work, an oscillating segment rotatable on the machine frame for actuating the needle segment, and an intermediate pinion rotatably mounted on the slide between the needle segment and the oscillating segment.

OTTO R. HAAS.

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