US2352275A - Sewing machine - Google Patents

Description

June 27, 1944.

B. T. LEVEQUE SEWING MACHINE 5 SheetS-Sheet 1 Original Filed June 17, 1941 5 Sheets-Sheet 2 Original Filed. June 17, 1941 June 27, 1944.

a B. T. LEVEQUE SEWING MACHINE Original Filed June 17, 1941 5 Sheets-Sheet s June 27, 1944.

B. T. LEVEQUE SEWING MACHINE Original Filed June 17, 1941 b Sheets-Sheet 4 June 27,1944. 3, T LEVE UE v 2,352,275 SEWING MACHINE Original Filed June 17, 1941 5Sheets-Sheet 5 Patented June 27, 1944 UNIT'EDIC STATES 'QOFFICE 1,

v k N SEWING n 7 Bernard T. Leveque, Wenhain, Mass, assignor to vUnited Shoe Machinery Corporation, Flemington, N. J., acorporation of New Jersey Original'application June 1'7; 1941, Serial No.

1942, Serial No. 444,255

' 30laims. (cine-5.6)

The present invention relates to'machines for sewing shoes or other articles composed of stiff, heavy materials, and is hereinafter illustrated as embodied in a shoe sewing machine of the straight hook needle type disclosed in U. S. Letproved mode of operation and more particularly to provide such a machine having a simplified and improved cast-off actuating mechanism.

With the above object in view, the invention consists in the improved constructions, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be apparent to those skilled in the art from the following description.

Referring to-the drawings,"Fig. 1 is a view in front elevation'of a machine embodying the features of the present invention; Fig. 2 is a view in front elevation of the lower portion of the machine, a cover late having been broken away to illustrate the needle cast-01f actuating mech* anisms; Fig. 3 is asectional view taken along the line 3-3 in Fig. 2 :Fig. 4 is a sectional plan view taken along the line 44 of Fig. 3; Fig. 5 is another sectional plan view taken along the line 55 of Fig. 3; Fig; 6 is a view in front elevation of the stitch forming devices illustrating the positions assumed just before the awl enters the work to form a perforation for a new stitch; Fig. 7 is a view of the stitch forming devices just after the awl has penetrated the work and the needle has withdrawn; Fig. 8 is a detail view on an enlarged scale of the needle cast-off illustrating the positions assumed with relation to the work, as indicated in Fig. 6; Fig. 9 is a similar view corresponding to the positions of Fig. 7; Fig. 10 is a view in front elevation of the stitch forming devices showing the needle as it begins to enter the work; and Fig. 11 is a view of the same parts taken during work feeding movement of the needle.

The sewing machine illustrated in the drawings is a chainstitch straight hook needle machine having an awl operating from above and the needle from below the work. A work feeding movement is imparted to the needle while engaging the work to advance the work a stitch length. The stitch forming devices of the ma- Divided and this'application May 25,

chine are driven from a main sewing shaft through cranks, pitmen and suitable connections between the stitch forming devices and the sewing shaft, as in the machine of the Merrick patents above identified.

In the illustrated machine, the straight hook needle is shown at 2 operating from below a for- Wardly projecting arm of a work support 4, and an awl at fi'operating from above the work support and at the same side of the work support with a presser foot 8 movable towards and from the work support to clam-p the work adjacent the points of needle and awl operation; Other stitch forming devices including a looper l0 and a castoff'l! all operate in a manner similar, except as hereinafter described, to the corresponding devicesin the machine of the patents. The awl is actuated by a crank IS on a main sewing shaft l8 and the needle from a crank 20 on an auxiliary shaft 22 driven from the main sewing shaft.

In the machine of the Merrick patents, the needle is actuated while engaging the workto feed the work by one mechanism and to reinforce the needle, as well as to otherwise facilitate sewing and work feedingoperations, the cast-off of that machine is actuated to coverthe barb of the needle by another mechanism separate and independent from the needle feeding mechanism. The cast-off 12 of the present machine is a reversely bent pointed arm illustrated most clearly in Figs. 2 and 6 to 11 inclusive, having a groovedupper end fitting the barbed side surface of the needle 2 and is actuated by the same mechanism employed to impart work feeding movements to the needle.

The needle bar 82 reciprocates in a carrier 210 formed at its lower end with a horizontal bore fitting a bar 212 and at its upper end with a rectangular lug loosely supported in a slot in the machine frame, which guide bar and slot act as guideway members for the carrier during feeding movements of the needle. The cast-off is supported on a bar 214 slidingly mounted in suitable bearings of the carrier 210 in advance of the needle bar 82 with respect to the direction of feed and the cast-off is bent towards the needle partially surrounding it along the barbed side of its surface, the cast-off bar bearings being parallel to those of the needle bar. By constructing and arranging the cast-offin this way, it is possible to cause the cast-off to follow the needle hook closely as the needle retracts from the work (Fig. 6) and to be retained to advantage in a position between the work and arm 284 surrounding a three-cornered feed cam 286 on the sewing shaft 22. At the angle of the link 278, there is a stud screw 288 on which is rotatably mounted a pair of blocks" 290' and 292. Th block 290 is slidingly disposed between the flanges of a channeled guide arm 294 adjustably secured at an angle to the vertical in the frame of the machine and the block 292 slides between with respect to the needle feeding mechanism that as the needle is disengaged from the work (Fig. 6), the back feeding movement is started. As indicated in Figs. 7 and 9, when the needle has reached the lower end of its stroke, the upper pointed end of the cast-off is mid-way between the work and the hook of the needle so that the needle hook is free and unobstructed.

The nature and scope of the invention having been indicated, and a particular embodiment of the invention having been specifically described, what is claimed is:

l. A shoe sewing machine having, in combina- ,tion, a hook needle, a sewing shaft, mechanism parallel downward extensions from the needle I bar carrier 210. To secure the guide arm 2% in adjusted position, it has a rearwardly extending stud 296 journaled in the machine frame (see Figs. 3, 4 and 5), and a slotted clamping sector 298' is fixed to the stud outside the frame, a cap screw 3% passing through the slot in the sector and into the side of the frame to clamp the sector to the frame.

The. feed cam 286 is shaped to cause the link 218 to be reciprocated vertically in the direction of needle reciprocation after. the needle enters the work (Fig. which movement causes the block 292 to slide in the channel of arm 294 to impart a horizontal work feeding component of movement, as illustrated in Fig. 11 to the upper end of link 278 as a result of the angle at which the arm 294 is set. The horizontal component of movement in the link 218 is transmitted to the needle carrier through the block 292 engaging the downward extensions from the carrier. 7 The extent of feeding movement imparted to the needle carrier is readily adjustable by changing the angle of the channel-arm 294 after having loosened the cap screw 300. In changing the extent of movement of the needle carrier, the vertical movement of the link 218 and therefore of the cast-off remains the same. 7

It is necessary for the cast-off toengage the work in. a chainstitch sewing machine only as the threaded hook of the needle is being withdrawn from the Work. In the present machine, this occurs when the needl carrier'hasreached the end of its work feeding movement (see Figs. 6 and 8). The mechanism for actuating the needle towards and from the work is so timed for actuating the needle towards and from the work, mechanism including a carrier for imparting a, work feeding movement to the needle while engaging the work, and a cast-off mounted in th carrier to move with the needle during feeding movement and operated by the work feeding mechanism towards the work to cover the hook on the needle as the threaded needle withdraws from the .work. 7 H

2. A shoe sewing machine having, in combinar tion, a hook needle, a sewing shaft, mechanism for actuating the needle towards and from the work, mechanism including a carrier in which the needle is mounted for imparting a work feeding movement to the carrier while the needle engages the work, a cast-off mounted in the carrier for sliding movement parallel to the movement of the needle towards and from the work, and a connection between the carrier mechanism and the cast-off to cause the cast-off to cover the hook on the needle as the threaded needle withdraws from the Work, I

3 A shoe sewing machine having, in combination, a hook needle, a sewing shaft, mechanism for actuating the needle towards and from the work, mechanism for imparting a work feeding movement to the needle including a carrier in which the needle reciprocates towards and from the work, a link connected to the carrier and actuated in the direction of needle reciprocation, a cast-off connected to the link to cover the hook ofthe needle as the threadedhook disengages the work, a guide arm for the link to cause a component of movement in .the link to be imparted to' the carrier, and means for adjusting the position of the guide arm to changethe component of movement imparted to the carrier without changing the movements of the cast-off.

. BERNARD T. LEVEQUE.

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