US1541800A - Awl-shifting and stitch-regulating mechanism for leather-stitching machines - Google Patents

Description

June 16,, 1925. v 1,541,800

1.. J. DU mus ET AL AWL SHIFTI NG AND STITCH REGULATING MECHANISM FOR LEATHER STITCHING MACHINES 2' SheetS-Sheet 1 Filed Oct. 5, 1923 June 16, 1925.

L. J. DU MAIS ET AL AWL SHIFTING AND STITCH REGULATING MECHANISM FOR LEATHER STITCHING MACHINES 2 Sheets-Sheet 2 Filed Oct. 5, 1925 3. 3 5 z 3 m w ww a w n W 4. was w l 1 w U1. a a 5 M u. m i fl 2 a .fimflfimigg Him Patented June 16, 1925.

UNITED STATES PATENT OFFICE.

LEO J. DU MAIS AND FLOYD E. MINER, OF CHICAGO, ILLINOIS, ASSIGNORS T0 CHICAGO SHOE MACHINERY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

AWL-SHIFTING AND surrrcn-nnecnnrrns MECHANISM non. LEATHER-STITCHING MACHINES.

Application filed October 3, 1923. Serial No. 666,237.

To all whom it may concern:

Be it known that we, Leo J. DU MAIS and FLOYD E. MINER, citizens of the United States, and residents of the city of Chicago, in the county of Cook and State of Illinois, have jointly invented certain new and useful Improvements in Awl-Shifting and Stitch-Regulating Mechanism for Leather- Stitching Machines, of which the following is a specification.

This invention relates, generally, to that type of sewing machines employed in the manufacture and repairing of leather goods, particularly boots and shoes, wherein a work-support or throat-plate is horizontally mounted at the front end of the machine, on which the work is supported, pierced and fed along by an oscillatory and slidably mounted awl, operating from the lower side of the work for oo-action with an oscillatory notched or hooked needle operating from the upper side of the work, and has especial relation to mechanism for shifting the awl of such a machine laterally, and to means for adjusting movements v of such mechanism.

The principal object of the invention is to provide a mechanism of the above mentioned character which shall be extremely simple in construction and eflicient in operation, with its parts so constructed, ar-

ranged and co-operating with one another that the work will be positively fed by the awl along the work support, and for the same distance at each operation or cycle of the machine, thereby affording uniformity in the distances between the openings formed in the work by the awl for the reception of the needle, and consequently,

regulation of and uniformity in the length of the stitches.

A further object of the invention is the provision of means whereby the lateral movement of the awl can be quickly and with great accuracy adjusted so as to insure the proper alignment of the same relative to the needle whereby the latter will,

with certainty, enter the hole in the work made by the awl.

The invention consists ,in certain pecuharities of the construction, novel arrangement and combination of the various parts thereof as will be hereinafter more fully set forth and specifically claimed.

In the accompanying drawings, which serve to illustrate an embodiment of the in-- vention, and in which like characters of reference designate similar parts throughout the different views,

Figure l is a View partly in section and partly in elevation of a fragment of a leather stitching machine of the general type above referred to embodying our improvements, the sectional part of said view being taken on line 1-1 of Fig. 2, looking in the direction indicated by the arrows.

Fig. 2 is a vertical sectional view taken on line 22 of Fig. 1 as indicated by the arrows.

Fig. 8 is a plan sectional view taken on line 38 of Fig. 2.

Fig. 4 is a detached perspective view of the upper portion of a cam-bar of the mechanism employed for shifting the awl and needle carrying shaft longitudinally or laterally with respect to the machine, and

Fig. 5 is a detached perspective view of a portion of said shaft.

Referring to the drawings, the reference numerals 10 and 11 designate a pair of upright standards forming a part of the frame ofthe machine and located at the front part of the base thereof side by side and in spaced relation to one another. The standard 10 is provided at its upper portion with a forwardly and horizontally disposed extension 12 which is formed on its side adjacent the standard 11with a vertically dis posed rectangular shaped recess 13 which extends through the upper end of said extension, as is clearl 1 shown in Fig. 2 of the drawings, in which view it will be observed that this recess has its lower wall 14: downwardly inclined towards the standard 11 or towards the surface of the extension 12 adjacent said standard. Communicating with the lower portion of the recess 13 is a rectangular guide-way 15 for the reception and operation of a bar 16 of similar shape in cross-section to the guide-way 15. This bar 16 has its upper portion laterally and outwardly deflected at an angle of about 30 degrees, to said bar, which deflected portion provides a cam 17 for co-operation with the awl carrying shaft of the machine as will be presently explained.

The recess 13 and guide-way 15 extension 12 are covered by a plate 18 secured to the extension 12 by means of screws 19, see Fig. 1 of the drawings. Mounted on the front portion of the extension 12 of the standard 10 and the front upper portion of the standard 11 is a horizontally and transversely disposed work-support or throat-plate 20 which is provided with an elongated opening 21 for the reception and operation of the needle and awl of the machine, the said opening being disposed par allel to the driving shaft 22, which shaft is transversely journa'led on the frame of the machine rearwardly of the standards 16 and 11 in the usual or any well known way.

Located in suitable openings in the upper portions of the standard 11 and the forward extension 12 of the standard 10, is the awl carrying shaft 23 which is adapted for slidable movement laterally with respect to its supports. This shaft intersects the recess 13 and is provided in its portion within said recess with a lateral y and vertically inclined channel 24 of a size and shape to snugly embrace three sides of the inclined cam 17 or portion of the bar 16, which bar has its portion below the extension 12 screwthreaded as is clearly shown in Figs. 1 and 2 of the drawings. The rear surface of the cam or portion 17 of said bar rests against the face of the rear wallof the recess 13 by which arrangement it will be understood that the cam or portion 17 will be completely encompassed by the channel 24 of tl e slidable shaft 23 and the aforesaid wall of the recess 13 in such a ay that in its vertical movements the bar and its cam or portion 17 will cause lateral movement of said shaft.

Fulcrumed near its front end on a shaft 25 horizontally journaled on the standards 10 and 11 at a suitable distance below the work-support 20 and extension 12 is a lever 26 which carries on its rear end a roller 27 for co-action with a cam groove 28 in one. of the faces of a disk 29 mounted on the drive shaft of the machine to rotate with said shaft. The front end of the lever 26 is forked or provided with a pair of laterally spaced prongs 30 each of which has its upper and lower surfaces rounded as is clearly shown in Fig. 1 of the drawings. Mounted on the screw-threaded portion of in the the bar 16 in threaded engagement therewith, is an adjusting nut which is designated as a whole by the reference numeral 31 and comprises a cylindrical portion having therethrough a vertical and screw-threaded aperture for engagement wit-h the screwthreaded portion of the cam bar. T he cyl indrical part 32 of the adjusting nut 31 is provided at its upper portion with an annular flange and at its lower portion with another annular flange 34 which is eina ged at its lower part and milled as at for the purpose of providing convenient means for turning said nut in order to adjust the bar 16 with respect to the front end of the lever 26 which in the operation of the machine reciprocates said bar as will be presently explained.

By reference to Figs. 1 and 2 it will be seen that the rounded portions of the prongs 30 of the lever 26 rest against the adjacent surfaces of the flanges 33 and and on opposite sides of the cylindrical part of the adjusting nut so that said prongs may have rocking contact with said flanges. Mounted on the lower portion of the screwthreaded part of the bar 16 is a lock nut 36 employed for maintaining the nut 31 in its adjusted position.

Referring again to the awl and needle carrying shaft 23 it will be observed ly reference to Figs. 2 and 3 that this shaft is provided at a suitable distance from the inner surface of the standard 11, in which one end of the shaft is mounted, with a fixed annular flange 37 and has surrounding its bearing portion a sleeve 38 provided on its inner end with an annular flange 39 which is spaced from the flange 37 and is fixed on the shaft 23 by means of a pin 40 extended through suitable openings in the sleeve and said shaft. Mounted on the shaft be tween the flanges 37 and 39 is a carrier 41 for the awl 42, which awl may be secured to the carrier in any well known way but usually by means of clamping plate 13 and a screw 44 extended through a suitable openin in said plate and seated in a snitable opening in the carrier.

The rear portion of the carrier 41 terminates in a segment or segmental rack having teeth 46 to mesh with teeth 41' on a se mental rack 48 having operative connection 48 with a suitable cam on the driving shai" t 22 of the machine for imparting oscillatory movement to the carrier 41 and its awl.

Surrounding the shaft 23 and screwed at one of its ends into an opening in the plate 18 which covers the recess 13 in the eaten 52 of the machine, which needle may be secured to its carrier in any well known way but usually by means of a clamping plate 53 and a screw 54 extended through suitable openings in said plate and carrier and held in position by means of a nut 55' on the opposite side of the carrier from that of the head of said screw. The rear portion of the carrier 01 terminates in a segmental rack 56 having teeth 57 to mesh with teeth 58 on a segmental rack 59 having operative connection 59 with a suitable cam on the driving shaft 22 of the machine for imparting oscillatory movement to the carrier 51 and its needle.

Inasmuch as the mechanisms for oscillating the awl carrier so as to cause the awl to pierce the work and for oscillating the needle carrier so as to cause the needle to enter the opening formed by the awl, is well known in the art, and as different mechanisms for performing said functions may be employed, we have not herein shown fully or completely such mechanism but enough thereof for an understanding of the oscillatory operation of the needle and awl carriers.

From the foregoing and by reference to the drawings, it will be readily understood and clearly seen that in the sewing operation of the machine the rod 16 will, through the instrumentality of the cam actuated lever 26, be vertically reciprocated and that in the movements of the cam or portion 17 of the bar 16, through the channel 24 of the shaft 23, the latter will be slid back and forth in its bearings in such a way that each hole pierced by the awl 42 will be positioned by the awl before the latter leaves the work at a point to be entered with certainty by the needle. It is further evident that when the parts, that is, the bar 16, cam

17, nut or block 31, and shaft 23, as well as the lever 26, are positioned as shown in the drawings and particularly in Figs. 1 and 2 thereof, the upper end of the cam 17 will rest against the side wall of the recess 13 with its heel or lower corner located in the extreme upper portion of the recess 2% of the shaft 28. When in these positions the mechanism is set for making the longest stitches of which it is capable. Now, by turning the nut 31 in the proper direction, on the screw-threaded portion of the shaft 16, the flanges 33 and 3 1 of said nut engaging the forks 3O therebetween of the lever 26 being held in a fixed position while its adjustment is being done, will cause the cam 17 to be moved downwardly through the recess 24: of the shaft 23 thus forcing the shaft to the left of Fig. 2, thereby shortening the movement of the shaft 23 and consequently the stitches.

Having thus fully described our invenawl to cause it to penetrate the work, and

means for actuating said bar to cause the awl to feed the work laterally.

2. The combination with a shaft mounted for reciprocation horizontally and trans versely on a sewing machine rearwardly of the work-support thereof, of an awl mounted for oscillation on said shaft, a bar mounted for vertical movement below said shaft and having at its upper portion an inclined cam co-operating with said shaft for shifting the same back and forth, means for oscillating the awl to cause it to penetrate the work, and means for actuating said bar to cause the awl to feed the work laterally.

3. Thecombination with a shaft mounted for reciprocation horizontally and transversely on a sewing machine rearwardly of the work-support thereof and provided with a vertically inclined channel, of an awl mounted for oscillation on said shaft, a bar mounted below said shaft for vertical move ment and having at its upper portion an inclined cam located in and slidably cooperating with said channel in said shaft, means for oscillating the awl to cause it to penetrate the work, and means for actuating said bar, said means including a cam-operated lever and means on said bar for adjustably connecting the bar to the lever.

i. The combination with a shaft mounted for reciprocation horizontally and trans versely on a sewing machine and provided with a vertically inclined channel, of a bar mounted below said shaft for vertical movement and having at its upper portion a vertically inclined cam located in and slidably co-operating with said channel in said shaft, said bar having its lower portion screw-threaded, an awl carrier mounted for oscillation on said shaft but for reciprocation therewith, a segmental rack on the rear portion of said carrier, a cam-operated segmental rack meshing with the first named rack for imparting oscillatory movement to the awl carrier for causing the awl to penetrate the work, an adjusting nut mounted on the screw-threaded portion of said bar and having a pair of flanges spaced one above the other, and a cam-operated lever provided with a pair of prongs to stride the body of said nut and to rockingly engage its flanges.

5. The combination with a shaft mounted nel in said shaft, means for oscillating the awl to cause it to penetrate the Work, means 10 for actuating said bar vertically to cause the awl to feed the work laterally, and means co-operating with said actuating means for vertically adjusting said bar.

LEO J. DU MAIS. FLOYD E. MINER.

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