Patent GB-191101722-A (GB)
Title: Improvements in or relating to Sewing Machines.
Inventor: HILL GEORGE S
IPC: D05B3/06
Filed: 1910-01-24
Granted: 1912-01-11
Abstract: 1722. Hill, G. S. Jan. 24, 1910, [Convention date]. Blind-stitching machines.- A blind - stitching machine, of the type described in United States Specification No. 404,863, for oversewing the thread - ends and the strengthening - cord of a series of button - holes, as shown in Fig. 16, is arranged with all the powertransmitting elements within the machine case. The needle is reciprocated in the line of feed and beneath the worksupport, penetrating the work in a direction opposite to that of the feed. The work is bent into the path of the needle by a reciprocating bender for the formation of each stitch, and the feed-dog is moved into engagement with the work as the bender is raised away from it. With the exception of the bender and the presser, all the moving parts are contained within the machine case. The bender 73 is pivoted within a hollow projection 75 of the machine case 20. The bender is forked at its inner end, and the arms of the fork are displaced axially relative to one another to engage directly with a pair of cams on the main shaft. The root of the fork is split by a saw-cut, and a screw which bridges the saw-cut is provided for the adjustment of the arms of the fork to the cam. The bender blade 72 is carried in the head of the bender, which is split and provided with a clamping- screw 77. The blade is positioned longitudinally within the head by means of a differentially screwed spindle 80, and is held from rotation by a feather. A pair of jaws 91, Fig. 14, are pivoted upon a stud 90, and are pressed together by a cee-spring 92. The jaws are positioned to receive the work as it is bent into the path of the needle, and press it closely on to the surface of the bender. The minimum opening between the jaws is determined by a screw stop. Feed by dog.-The feed-bar 145 is supported by two levers 153, 147 from which it receives the usual four-motion. The feed-lift lever 153 is actuated by connexion with the bender. Needles, driving and vibrating; lock-stitching by shuttle; governing needle thread. - The needle-bar, shuttle, and take-up are actuated by pins upon a compound crank secured to the main shaft. In one form, the needle-bar 103, Fig. 3, is reciprocated by a pitman 120 connecting it with the crank-pin 117 of the compound crank. The needle - bar is slidingly mounted in a frame 104, pivoted at its rear end upon a pin 106 fixed in a bracket within the machine case and guided in an horizontal plane by means of a plate 204, which engages a slot 205 in the forward end of the frame. The frame is linked by a pitman 112 to a crank-pin on a horizontal disk 108, which is provided with skew-gear teeth, and engages a pinion of half its own size on the main shaft. In an alternative form, the needle-bar 103, Fig. 21, is reciprocated in fixed guides 180, 181, and a needle-carrier 182 is pivotally mounted upon the needle-bar, and is oscillated once for every two stitches by connexion with the skew-gear wheel 189, the connexion including a rod 183 secured to a lever 184 on a shaft 188 and sliding in a socket in the needle-carrier. To compensate for the lateral movement of the needle relative to the shuttle, the field of the longitudinal vibration of the needle is automatically varied by the interaction of the engaging surfaces of the needle-carrier and needle-bar, which are screwthreaded. To oscillate the vertically-arranged shuttle-shaft 136, a crank-pin 139 carried by it engages a slotted lever 140 carried by a second shaft mounted parallel with the shuttle shaft. The second shaft carries another lever which is linked by a pitman 143 to one of the crank-pins 115 of the compound crank. The needle-thread take-up 123, Fig. 17, is pivoted between its ends upon a lever 126, and is pivotally connected at its end remote from the thread-eye 124 with the third crank-pin 119 of the compound crank. Driving; stopping - gear, non - automatic; frames.-The main-shaft 29 is mounted upon brackets 30 projecting downwardly from the upper part 21 of the machine case, which is hinged to the lower part. A fixed pulley 32 is secured to the end of the shaft. When the machine case is closed, this pulley is adjacent to, and in alinement with, a loose pulley 34 mounted upon a fixed stud 33. The belt 35 is controlled by a belt fork 36 carried by a starting-lever 37 carried by a pivot-shaft 39 and operated by a treadle-rod 44. A spring tends to maintain the starting-lever in a position to hold the belt on the loose pulley. It is prevented from being depressed into the position shown, when the machine case is open, by a latch-lever 46, a projection 50 on which passes beneath it. When the case is closed, a cam-lug 49 on the underside of the work-plate removes the latchlever from engagement with the starting-lever. A stop-cam 52 is resiliently secured to the fast pulley in the usual manner. A stop finger 64 is carried by a frame 56 revolubly mounted on a spindle 57 and pressed towards the cam by a spring 60. The finger is engaged by a slotted lever 61, fast on the pivot-shaft 39 of the starting-lever, so that when the starting-lever is moved to shift the belt on to the loose pulley, the finger is swung into the plane of the cam, and, engaging with the cam, brings the machine to rest. Presser-bars, lifting non-automatically.-The presser 95 is pivoted upon the same pivot as the bender and is pressed on to the work by a spring 100 and a rod 98. When the machine is stopped, the rod 98, and consequently the presser, is raised by means of a cranked lever 70 connected by a rod 62 with the stop-finger 54. A spring 69, surrounding the rod 62, tends to keep the starting-gear in stop position. Work-supports; spools and bobbins, holders for.-The work-plate is grooved transversely to the line of feed, and a short slot is provided in the bottom of the groove for the passage of the work when depressed by the bender. The needle-bar and take-up are mounted beneath a gap in the machine case, which is covered by a plate 159 having a pivot-pin 161 secured thereto. The pin is surrounded by a spring 162 which normally holds the plate 159 in place, but when the plate is pressed upwards, the spring rotates it and exposes the needle-bar and take-up. The plate 163 covering the shuttle cavity is hinged to the machine case, and is held in its normal position by a spring 167. It is provided with a heel 169, which, when the lid 28 of a spool magazine is raised, is engaged by a projection 170 on the lid, and causes the lid to lift the cover-plate 163. The heel 169 is notched so that the lid 28 and the plate 163 lock together in the raised position. Cavities are provided in the spool magazine for the reception of shuttle spools. The needlethread spool 129 is carried by a fixed sleeve 175 and is retained thereon by the head 178 of a rod 176 which fits within the sleeve 175. The rod 176 is split at 177, and the resilient branches of the rod press upon the inner surface of the sleeve. The sleeve 175 and the rod-head 178 are provided with conical surfaces 174, 179 with which to engage spools having a larger internal diameter than the outside diameter of the sleeve.