Patent GB-191101797-A (GB)
Title: Improvements in Sewing Machines.
Inventor: MILLS CLAUDE KENNEDY
IPC: D05B57/02
Filed: 1911-01-24
Granted: 1911-10-19
Abstract: 1797. Mills, C. K., [Dearborn, C. A.]. Jan. 24. Blind-stitching machines; chain-stitching.-A blind - stitching machine is provided with a needle and looper, both operating transversely of the line of feed, and a thread-engaging pin, the looper taking the thread on one side of the line of stitches and carrying it to the other side into engagement with the pin to spread the loop for the entrance of the needle. The curved needle 17 is mounted on a shaft 15 oscillated by an eccentric from the main-shaft 10, while the work-support 40 is mounted on a shaft 34 fixed in sleeves of an arm 30, the shaft being encircled by a spring one end of which supports the plate 40 while the other is attached to a tension-adjusting rod 47. An adjustable stop 49 limits the movement of the plate 40 by engaging a projection 41<a>. The plate 40 has a projecting work-supporting horn 55, which carries the ridge-forming disk 60 and the side platens 70, as described in Specification 11,994/11. The presser-foot 100 is attached to a yoke 102 pivoted to the frame, and is supported by a spring 106, while on its upper side it carries a yoke 115 engaging in a slot 117 in a pin 116 attached to the frame and surrounded by a spring 118 which presses on the yoke 115 The spring 118 is stronger than the spring 106 but weaker than the spring of the work-support, to allow the presser-foot to rise for an extra thickness of work. The presser-foot 100 has a needle-guide slot 111, a slot 110 through which the work is pressed, an opening 112 for the looper, and an opening 113 for the needleguide 121, which is fixed to the frame and provided with an opening 123<a>, a thread-pin 124, and a groove in alinement with the groove 111. An upper feeding-device is also provided, consisting of two dogs 130, 131 attached to a bar 133 having a slot 134, in which engages a roller 135 supported on the frame. The rear end of the bar 133 is formed with a yoke 136 embracing an eccentric 137 on the shaft 10. The looper rod 140 is inclined downwardly and inwardly with relation to the needle-shaft, and is oscillated by two reverse tapes 165 mounted on milled pulleys 160, to which they are attached by wires 166, Fig. 5, and split tubes 167 fitting in circular grooves in the pulleys. Each tape 165 is similarly attached to a pulley segment 170 formed integral with a rocking frame journaled on a pin 175 and oscillated by a connexion 131 to a crank-disk 13 on the shaft 10. The looper consists of a shank 145, Fig. 9, and an arm 146 having a foot 147, Fig. 10, approximately at right-angles thereto, formed with a bevelled toe 148, a thread - engaging shoulder 149, and a groove 150. In a modification, the groove is dispensed with, the position of the thread finger 124 being slightly altered. The needle passes through a ridge of work over the disk 60 and presents a loop to the looper at the other side. The toe of the looper catches the loop and draws it back across the line of stitching, and moves downwardly above the plate 122 to cause the thread to engage the pin 124, Fig. 9, to spread the loop for the needle to enter.