US1960721A - Sewing machine - Google Patents

Description

I. F. WEBB SEWING MACHINE May 29, 1934.

3, 1931 2 Sheejas-Sheet 1 Filed Nov.

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I. F. WEBB SEWING MACHINE May 29, 1934.

Filed Nov. 3, 1931 -2Sheets-Sheet 2 Patented May 29, 1934 UNITED STATS PATENT OFFIE SEWING MACHINE Application November 3, 1931, Serial No. 572,762

3 Claims.

This invention relates to a type of sewing machine used in bleacheries for stitching together, by means of overseaming stitches, the ends of long lengths of cloth, so that when opened out the joined ends will abut and lie flat and not ofier any obstruction when the cloth is passed through bleaching, singeing, scouring, dyeing or calendering operations.

It aims to provide a new and improved machine of this type capable of handling any width of cloth.

It also aims to provide a driving device for the cloth conveyor-belt which is driven by a connection with the sewing machine main-shaft so that ous operations in the bleachery.

In its preferred form the construction comprises an overseaming sewing machine mounted upon a suitable frame upon whose ends are journaled pulleys adapted to support the conveyorbelt provided with impaling pins, upon which to feed, past the stitch-forming mechanism, the ends of cloth to be joined. One of these pulleys is continuously driven from the sewing machine main-shaft. The other pulley is journaled upon a block slidably mounted upon the frame whereby the pulley may be readily shifted to slacken the tension of the conveyor-belt and permit its removal from the pulley in order to gain access to the lower thread-handling mechanism of the sewing machine.

To insure that the cloth is properly impaled upon the pins of the conveyor-belt a presser-cylinder bears upon the cloth in advance of the stitch-forming mechanism. This presser-cylinder is made in two sections between whose ends are removably clamped blocks having printing characters which extend beyond the periphery of the presser-cylinder and contact with the cloth as it passes beneath the same. H

The invention is illustrated in the accompany ing drawings in which Fig. 1 is a side elevation and Fig. 2 a top plan View of the machine. Fig. 3 is a detailed perspective view, partly in section, of the presser-cylinder and marker. Fig. 4 is an end view of the adjustable section of the presser-cylinder showing the annular rib for retaining the special form of type-blocks. Fig. 5 is a perspective View of one of the type-blocks.

As represented in Fig. 1 of the drawings, the sewing machine A, which in the present instance, is of the well known Singer type of overseamer, as disclosed in the patent to A. Grieb, No. 932,272, of August 24, 1909, is mounted upon the base 1 secured upon the frame 2 by the bolt 3. The frame 2 is secured upon the angular supporting bar t by bolts 5 and the bar is secured upon the table-top 6 provided with legs, one of which is shown at 7.

Fast upon the main-shaft 8 of the sewing machine is a belt-pulley 9 driven by means of a belt 10 from the transmitter B depending from the table-top 6, which transmitter in turn is driven by a belt 11 from an electric motor (not shown). Also secured upon the sewing machine main-shaft 8 is a sprocket-wheel 12 connected by a chain 13 witha second sprocket-wheel 14 secured upon the cross-shaft 15 suitably journaled in the frame 2 attached to one end of the main supporting bar 4. The free end of the cross-shaft 15 is provided with a removable change-gear 17 keyed to the shaft and retained in position by a nut 18. other change-gear 19 secured upon a second cross-shaft 20 disposed below the cross-shaft 15 and also journaled in the frame 2. The lower cross-shaft 20 is provided with a bevel-gear 21 which meshes with a similar'bevel-gear 22 secured upon the longitudinal shaft 23 also journaled in the frame 2 and parallel with the main supporting bar 4. The free end of the longitudinal shaft 23 is provided with a worm 24 which meshes with a worm-wheel 25 carried upon a third cross-shaft 26 also journaled in the frame 2 and parallel with the cross-shafts 15 and 20. The cross-shaft 26 carries the flanged driving pulley 27 for the conveyor-belt 28. It will be readily understood that the conveyor-belt 28 is continuously and positively driven from the main-shaft 8 of the sewingmachine and the speed of the conveyor-belt may be altered by substituting the proper gears upon the parallel crossshafts 15 and 20 to suit the length of stitch produced by the feeding mechanism of the sewing machine.

Adjustably secured upon the other end of the angular supporting bar 4 is a bearing-block 29.

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Gear 1'7 engages an- This block is fitted to slide upon the bar 4 by means of pins 30 carried by the block and entering a slot 31 in the bar. It is retained in adjusted position by the clamp-bolt 32 passing through the slot 31 in the bearing-block and entering a threaded aperture in the bar. For convenience in shifting the bearing-block 29 there is provided a hand-lever 33 whose lower end is pivotally mounted upon the main supporting bar 4 by means of the screw 34 and intermediate its ends it has a pin-and-slot connection 35 with the bearing-block 29. Carried by the bearing-block is a cross-shaft 36 upon which is journaled the flanged idler-pulley 37 for the conveyor-belt 28. From the foregoing it will be readily understood that by loosening the clamp-bolt 32, the bearing-block 29 may be conveniently shifted by means of the hand-lever 33 in order to adjust the tension of the conveyorbelt 28 or slacken it sufficiently to permit its removal from the idler-pulley 37 for access to the lower thread-handling mechanism of the sewing machine.

Rising from the frame 2 and secured to the latter by screws 38 is an arm 39 which terminates in a bearing-boss 40 disposed above the sewing machine A and in which is journaled the cross-shaft 41. One end of the shaft, extending over the conveyor-belt 28, forms a pivotal support for the upper end of a frame 42 which is retained upon the shaft by the collars 43 secured by set-screws 44. The downwardly extending spaced arms 45, 45 of the frame are braced by the tie-rod 46 and between the lower free ends of the arms there is rotatably mounted, upon the pivot-screws 47, 47, the presser-cylinder 48 which is provided with clearance-grooves 49 for the two rows of spaced impaling pins 28' of the conveyor-belt 28. During the operation of the machine the presser-cylinder 48 bearing down upon the material insures that it is impaled upon the pins 28 before it reaches the overseaming stitch-forming mechanism.

The body of the presser-cylinder 48 is formed with a reduced threaded portion 50 upon which is fitted the adjustable section 51. The inner face of the adjustable section 51 is formed with an annular web 52 for retaining the U-shaped typeblocks 53 (Fig. 5) upon the outer face of each of which is fashioned an identification character or type of any suitable kind. The web 52 is provided with a clearance-slot 53' to permit insertion and removal of the characteror typeblocks 53. The selected type-blocks are radially inserted successively through the slot 53' upon the web 52 and clamped against the end wall of the presser-cylinder 48 by meansof the adjustable section 51.

The characters upon the blocks 53 receive ink from an inking device. This comprises an inkreservoir or fountain 54 from which ink flows to a series of distributing and inking rollers 55 the last one of which contacts with the characters upon the blocks 53 projecting beyond the periphery of the presser-cylinder 48. The ink-fountain and distributing and inking rollers are mounted upon a frame 56 which is removably attached by a bolt and wing-nut 56' to one of the spaced arms 45 supporting the presser-cylinder. The inking and distributing rollers 55 are mounted upon a series of parallel shafts 5'7 journaled in the frame 56 and connected by intermeshing gears 58 with a driving gear 59 mounted upon the reduced portion 50 of the presser-cylinder 48. 3

Rising from the supporting bar 4 is the bracket 60, the horizontal arm 61 of which supports one end of the work-supporting plate 62. The other end of the work-supporting plate is secured to the usual cloth-plate A of the sewing machine. Rising from the frame 2, intermediate the driving pulley 27 and the work-supporting plate 62 is another bracket 60' having the horizontal arm 61'. The work-engaging portion of the conveyor-belt 28 is supported, between the driving pulley 27 and the idler-pulley 37, upon the plate 62 and the horizontal arm 61' of the bracket 60'. The worksupporting plate is provided with a rectangular aperture 62' through which projects a springpressed roller 63 journaled in a frame 64 depending from the bottom of the sewing machine clothplate A beneath that portion of the pressercylinder 48 carrying the type-blocks. The springpressed roller 63 forms a yielding support for the type while in contact with the material being joined by overseaming stitches.

Secured to the inner arm 45 of the frame 42 by a bolt 65' is a lifting-lever 65 whose other end rests upon the cross-shaft 41. Downward pressure upon the free end of the lever 65 will raise the presser-cylinder 48 from the conveyor-belt 28.

The machine is fitted with a manually operated thread-cutter for severing the chain of threads formed at the completion of a stitching operation. This comprises an inclined spring-pressed bar 66, fitted in the arm 39, and carrying at its lower end a knife-blade 67 adapted to sever the threadchain upona block carried by the sewing machine bed-plate. The upper end of the knife-bar 66 is disposed beneath a cam-plate 68 fast upon the cross-shaft 41 supporting the presser-frame 42. The free end of the cross-shaft 41 has secured thereon an upstanding arm 69 connected by a chain 70 with an operating arm 71 loosely pivoted upon the cross-shaft 36. Operation of the arm '71 will depress the spring-pressed cutter-bar 66.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a machine of the class described, the combination with a sewing machine having overe-dge stitch-forming and feeding mechanisms, a continuously moving conveyor-belt disposed at one side of said sewing machine feeding mechanism for feeding the material past said stitch-forming mechanism, impaling pins carried by said conveyor-belt, and a presser-cylinder disposed in ad- Vance of said stitch-forming mechanism in line with said pins and formed in spaced sections disposed at opposite sides of said impaling pins for impaling the material upon said pins prior to its passage under said stitch-forming mechanism.

2. In a machine of the class described, the combination with a sewing machine having overedge stitch-forming and feeding mechanisms, a con tinuously moving conveyor-belt disposed at one side of said feeding mechanism for feeding the material past said stitch-forming mechanism, spaced rows of impaling pins carried by said conveyor-belt, a presser-cylinder disposed in advance of said stitch-forming mechanism for impaling the material to be overseamed upon said pins prior to its passage through said stitch-forming mechanism, and marking characters carried by said presser-cylinder for imprinting said material while being overseamed by said stitch-forming mechanism.

3. In a machine of the class described, the combination with a sewing machine having overedge stitch-forming and feeding mechanisms, a continuously moving conveyor-belt disposed at one pins prior to its passage through said stitch-forming mechanism, and marking characters clamped between the sections of the presser-cylinckar for imprinting said material while being overseamed by said stitch-forming mechanism.

IRVING F. WEBB.

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