Patent GB-191214300-A (GB)
Title: Cord Laying Device for Sewing Machines.
Inventor: FAIRWEATHER WALLACE
IPC: D05B35/06
Filed: 1912-06-19
Granted: 1912-11-14
Abstract: 14,300. Fairweather, W., [Singer Manufacturing Co.]. June 19. Button - hole sewing- machines; cords, attaching; button-holes, cutting.-Consists of a device, more particularly applicable to button-hole sewing - machines, for laying a cord within an overseam with its ends embraced and concealed by same. A needle 16 is carried on a vibratory yoke 15 mounted on a bar 10 having its lower bearing in a feathered bushing, and co-operates with a non - threaded looper 17, a threaded looper, and a detainer 19 on a rotary carrier 20 mounted on a spindle 21. The needle and carrier are rotated in stitching the end of a button-hole by rack-bars 24, 25 engaging pinions on the bushing and the carrier. The work is clamped between feet 26 on arms 27 mounted on lower jaw plates 28 mounted on a cross-slide plate 29 having lugs to receive a guide-bar 31 entering apertures in lugs 33 of a longitudinal slide-plate 44 sliding in a guide-way in the bedplate 2. The rear of the plate 34 is slotted and receives a hollow square-headed stud 38, Fig. 2, a flange 39 on which, together with the head of a threaded bolt 40 contained in the stud, clamps a grooved pivoted arm 43 carrying a stud 46 entering a groove in a feed-cam 48, which is also grooved to receive the stud of the pivoted actuating - lever of the cross - plate 29. The upper and lower cutter-bars, the former carrying a punch, are fulcrumed in a travelling block, both the block and the lower bar being actuated by cams on a cross-shaft 63, the block moving the cutters to and from the stitching position. The shaft 63 is connected to the source of power by a loose belt wheel, a coupling- device, and stopping-means, whereby the cutter shaft receives one rotation for each operation. The needle-bar bushing carries a slotted guideplate 71 in which works a pin 72 attached to the clamp 15, while at the side is attached an arm 74 carrying a taper cord-guiding tube 76. A bracket 78 on the head 5 carries a bracket 82, Fig. 5, formed with a bearing-boss 83 having at one end a cavity 84 to receive a serrated feedwheel 85 fixed on a rotary shaft journaled in the boss and carrying a pinion 87 gearing with a pinion 89 on a boss shaft journaled in a boss 92 on the bracket 82. This shaft also carries a clutch-wheel 93 with an inwardly-directed flange 94. The cavity 84 has an opening communicating with a cord-passage 95, Fig. 10, a projection 98 on a removable spring 97 pressing the cord on to the wheel. A clutch-lever 100, Fig. 6, is mounted on the hub of the wheel 93, and is notched to engage a dog 102 formed with a notch 103 to engage the flange 94; a spring 104 holds the dog in position. The lever 100 is connected to a crank 109 on the shaft 63. The boss 92 has a flange 111 with an extension 112 between which and the wheel is a spring-pressed radial holding-dog 113 the motion of which is limited by pins 115, 116 to prevent backward movement of the wheel 93. On the face of the bracket 82 is a hardened plate 117 having an orifice registering with the passage 95, while between this plate and a cover-plate 137 is a three - armed lever, one arm 120 carrying a cutter with an upper knife-edge, a second being connected by a spring secured to the bracket, while the third arm 121 has a lug 125 normally resting in contact with the top of a notched cam-block 126 mounted on an arm 130 attached to a plate 28. Early in the movement of the work-holder, the lug 125 drops into the notch and allows the spring to move the knife-edge to cut the cord. Later the lug is caused to ride up an incline on the cam and along the top, the shifting of the work-holder for the second side stitching causing return behind the notch. A lower cord is preferably threaded through the needle aperture and the upper cord a drawn through the cord-passage 95. The actuation of the cutting-shaft vibrates the clutch-lever 100 and turns the wheel 85 to propel a section of cord into the tube 76 and on to the work. The initial stitches s are then sewn, and as the fabric is fed forward while the cord is detained, the end is drawn within the seam. The cord is then cut and the section released to travel with the work. The feed of the wheel 85 is so adjusted as to cause such a length to be cut off as will leave the other end covered by the final stitches.