Patent GB-190312177-A (GB)
Title: An Improved Lock-stitch Sewing Machine.
Inventor: ROSENSCHEIN JOSEPH LEO
Filed: 1903-05-28
Granted: 1903-11-12
Abstract: 12,177. Rosenschein, J. L., and Manning, H. May 28. Lock-stitch shuttle sewing-machines ; frames; needle-holders.-Fig. 2 is an end elevation of a lockstitch machine, driven either by hand or treadle gearing. The front and back members of the frame of the machine are held apart by stay bolts and distance-pieces, and the back member 2 is provided with clamping-jaws 4 for fixing to an ordinary table. A needle-bar 6, operated by a cam 12, slides in guides 7, 8, and has an arm 9 for carrying the needle. A shuttle carried by a rocking lever 21, operated by another cam 25, rests in a crad e 26 (shown in dotted lines in Fig. 4), of such form that the shuttle tends to lie by its weight with its flat side against a shuttle race 28. A spring-controlled sliding bolt closes the rear opening of the cradle 26, but allows the shuttle to be readily inserted or removed. Feed; presser-feet; presser lifted automatically.- The work is fed forward by a serrated presser-foot 40, Fig. 4, carried by an arm 41 on a cam-operated vibrating lever 42, and, while the needle holds the work steady, the presser-foot is raised and moved backwards ready for the next feed movement. A spring 45 attached to the frame 2 bears upon a ledge 46 on the lever 42, so as normally to cause the presser-foot to hold the work on the workplate. The length of the stitch is regulated by an adjustable set-pin 47 screwing through a lug on the frame of the machine. Governing needle thread.-The needle thread is led from a spool mounted on a pin 60, through an ordinary spring tension device 61, thence through guide-eyes 62, 63 to the eye of the needle by way of a take-up device. This latter consists of a light flexible spring arm 64 spirally coiled and attached at one end to the needle arm 9, its free end having an eye 65 for the thread-bight formed between a pair of guide-eyes 67 on the needle arm. Spools and the like winding.-The spool to be filled is mounted between pivot centres, one on a usual carrier 76, and the other on a limb 78 of a U-shaped pivoted frame of flat spring steel. The other limb 72 of the frame forms a journal for a spindle 70, having at its end a small V.edged pulley 74, which is held in gear frictionally with a V-shaped peripheral groove 75 on a disc 14, mounted on a shaft 15, driven by spur-wheels from the driving-wheel. Driving.-A pinion 50, mounted on the shaft 15, gears with a spur-wheel 51, driven by means of a V-grooved hand-wheel 53, fitted with a spring- controlled crank handle 54, adapted, when not in use, to be folded back as shown. The handle also acts as a counterpoise, so as to retain the needle-bar in its highest position for convenience when threading the needle. The crank handle may be replaced by a portable treadle-operated driving- gear, the sole-plate of which is adapted to be held down by the foot of the operator, or by the leg of a table, and the frame 90 of which is provided with a clamp 101 for clamping to the table leg. It consists of a lever 96 pivoted at one end 97 to an ordinary treadle 98, and having the other end 95 eccentrically connected to a \/-grooved driving- wheel over which a driving-band passes to the groove in the wheel 53.