Patent GB-191500646-A (GB)
Title: Ornamental Stitch Sewing Machine.
Inventor: FAIRWEATHER WALLACE
IPC: D05B29/06
Filed: 1915-01-15
Granted: 1915-09-23
Abstract: 646. Fairweather, W., [Singer Manufacturing Co.]. Jan. 15. Sewing-machines; needles, vibrating laterally; presser-feet; work guides; work supports.-Relates to ornamental-stitch sewing-machines having a needle vibrated laterally from a segment lever driven from a cam on the main shaft, and consists in the provision of means whereby the segment lever is disconnected from its drive to interrupt the vibratory movements of the needle, means for regulating the tension of the needle thread according to the amplitude of needle vibration, interchangeable needle plates and spur eyelets, and the attachment of the presserfoot to the presser-bar. The segment-lever carrier 28, Figs. 1, 4, and 6, with the cam follower 26, has a tubular pivot pin 29 mounted in a boss on the overhanging arm of the machine and secured therein by a collar 31. The segment lever 32, Fig. 5, has an arcuate slot 34 'in which works the slide block 66, connected by a link 68 to the swinging needle gate. and by a link 65 to the adjusting-mechanism, and has a tubular pin 33 passing through the pin 29 and held in its normal position by a collar 49 and spring 52. The teat 38 on the segment lever engages with either of the sockets 39, 40 nn the driver, according to the character of the stitch required, and is disengaged by pressure on the pin 41 acting through the spring 46. A rockshaft 55 mounted in a bracket 53 carries an arm 62 connected by a pin and slot 63, 64 with the slide block-adjusting link 65, a spring tending to hold the pin 63 normally at the lower end of the slot 64, and is operated by a treadle-rod, rock-lever, link 79, and arm 73, another spring holding the rock-shaft normally in the position in which the slide block is coincident with the pivot of the segment lever. The arm 73 also carries a cam 74, which acts against a leaf spring 76, Fig. 2, and helical spring 77 to vary the thread-tensioning effect of the disks 53, 54. A yoke 56, Fig. 2, slidable but not rotatable on the shaft 55, carries an arm 57 with a camsurface 58 normally clear of the pin 41 under the action of a cam-lever 60 mounted in the shaft, but brought into position for acting on the pin to disconnect the segment lever from its carrier and interrupt the vibratory movement of the needle, under the action of a spring 61 when the lever 60 is released. A lug 107 on the carrier tracks the slot 35 in the segment lever, closing the slot 34 and acting as a stop for the slide block when the teat 38 is in the socket 40. When the teat is in the socket 39, the lug 107 is clear of the slot 34, and a stop 70 is provided for the slide block. The notch 36 engages a fixed lug on the machine to hold the segment lever when disengaged from the carrier, and the slide block can be fixed in any required position to produce needle vibrations of constant amplitude. The cloth plate 86, Fig. 8, is secured to the bedplate by a pin and the latch 88, and carries interchangeable spur eyelets or needle plates 90 secured by a pin and the sliding plate 95 engaging a groove therein. The presser-foot 103, Fig. 11, is notched at 105 and is clamped between the lower end of a tubular presser-bar and the flanges 102 on a rod 100, which passes up through the presser-bar and is secured by a nut at its upper end.