Patent GB-611837-A (GB)
Title: Sewing machine
IPC: D05B27/18
Filed: 1946-05-10
Abstract: 611,837. Sewing-machines. SINGER MANUFACTURING CO. May 10, 1946. No. 14155. Convention date, July 9, 1945. [Class 112] Overhead sewing-machines, scale-pan type.-A cup-feed machine has its main shaft arranged vertically in a standard, the stitch-forming devices being carried by a wall of the standard and being arranged on horizontal axes. Means are provided for separating the feed-cups for insertion of the work, for illuminating the sewing point, and for lubricating the working parts, most of which are enclosed in an oil-tight portion of the frame to prevent soiling of the work. The driving-gear of the machine is nowhere exposed above the work-table, and may be arranged entirely below the table. Stitch-forming devices; frames; driving: -The horizontal needle-bar 74 slides in a bush in the wall of the frame standard and is actuated by a pitman 79 from the vertical crankshaft 16. A threaded looper 96 is carried by a horizontal shaft 87 placed at an angle to the needle-bar and oscillated by a ball-jointed pitman 82, and a forked loop-spreader, adapted to engage the looper thread, is carried by a shaft similarly placed on the opposite side of the needlebar, somewhat lower than the sharft 87, and actuated by a similar pitman 104. The bottom of the frame is closed by a plate 13 which rests on the work-table, and the upper part is formed to provide a separate compartment 12, closed by a cover-plate 8, to receive part of the feed mechanism. The shaft 16 is driven by a belt passing over a pulley on a horizontal shaft 45, Fig. 3 (not shown), mounted in the front of the frame and carrying a bevel pinion engaging a corresponding bevel pinion 50 on the shaft 16; the belt and pulley are covered by a dished plate attached to the front of the frame. In an alternative arrangement, the shaft 16 extends through the plate 13, being supported in a separate bearing attached to that plate, and carries a belt pulley on its lower end. Feed.-The work is held and fed between two cup-wheels 6, 7 on vertical shafts 114, 127 respectively driven from a shaft 120 which is actuated from the shaft 16 by an adjustable eccentric 124, pitman 123 and one-wav clutch 121. Shaft 114 bears in extensions of the frame and is enclosed in a tube, being connected by gearing to the lower end of the shaft 120; the upper shaft 127, likewise enclosed in a tube 128, is driven by belt from the upper end of the shaft 120. The tube 128, forming a bearing for the shaft 127, is clamped in the end of a lever 70, enabling the feed-cups to be separated, within limits imposed by adjustable stops 135 engaging the tail of the lever, by a ccnnection 138 passing from a treadle thrcugh a tube 140 to the lever 70; the feed-cups are urged together by a spring (not shown). Lubricating.-The lower part of the frame forms an oil reservoir filled through a plug 41 which also gives access to the adjustable eccentric 124. The reservoir feeds a recess 24 at the foot of the shaft 16, and oil is lifted by a helical groove 28 in the shaft and forced through an axial bore in the shaft to the bearings 18, 17 and the big ends of the pitmans 79, 92, 104. A recess in the bore of the top bearing 17 collects oil and feeds it to a pan 36 provided with apertures through which it drips on to the small ends of the pitmans 92, 104; a flinger ring formed on the hub of the hand wheel 22 on the top of the shaft 16 prevents escape of oil at the top of the machine. Oil escaping from the bearing 18 collects in a tray 52 which has a spout leading it to the bearing of the horizontal shaft carrying the bevel pinion by which the bevel pinion 50 is driven. Illuminating devices.-An electric lamp (not shown) is mounted in a recess in the frame at the junction of the upright portion with the overhanging part carrying the feed-cup 7. The cable passes from the bottom of the machine through a tube similar to the tube 140.