Patent GB-221678-A (GB)
Title: Improvements in or relating to sewing machines for the automatic production of embroideries, festoon-seams, edgeseams, hemstitches, or the like
IPC: D05C7/06
Filed: 1923-10-30
Abstract: 221,678. Vogtlandische Maschinen- Fabrik (vorm. J. C. & H. Dietrich) Akt.-Ges., and Brase, W. Oct. 30, 1923. Embroidery machines; needles, vibrating laterally. -In a machine for automatically producing embroidery, festoon-seams, edgeseams, hemstitches &c., jacquard mechanism is provided whereby the stitch-forming mechanism and the feeding mechanism may be displaced at every stitch along two directions inclined one to the other. In the machine shown in Figs. 1, 3, 4, 5 and 8, a laterally movable needle-bar 5 is reciprocated by a lever-frame 7 connected to the shaft 3 by a link and having sliding connection by means of a frame 10 with the needle-bar. A thread-guide 16 is carried by a sleeve 25 for the bar 5 forming part of a frame by which the lateral needle movements are conveyed. This frame is pivoted to a frame 28 pivoted to the machine frame and actuated by a rod 32 connected to the jacquard mechanism. A shuttle casing 47 is carried by a tubular member 48 displaceable synchronously with the needle and surrounding a shuttle-operating shaft 51. The shaft 51 is given stitch-forming oscillations by mechanism comprising a pin 53 carried by the cranked end of the shaft, a slotted lever 56 embracing the pin and mounted on a shaft 54 and a lever 57 connected to the lever 56 and oscillated by a link 58 connected to a crank 35 on the main shaft. The link 32 and sleeve 48 are connected to arms 60, 61 projecting from a shaft 59 and thus share in movements communicated by the jacquard device. These movements are effected by mechanism comprising a forked lever 63 cooperating with a cam 37 on the main shaft and mounted on a pivot 65 which engages a slot in a member 66 adjustably secured to the machine frame. By varying the inclination of the slot the lever 63 is caused to perform movements of varying amplitude in a vertical direction. The lever 63 is connected to an arm 70 on a shaft 71 from which projects an arm 72, Fig. 1, to which is attached an arm 73 carrying a knife edge 74. An arm 75 also projects from the shaft 71 and engages a forked arm 76 mounted on a shaft carrying an arm 78 pivoted to an arm 79 having a knife-edge 80. The arms 73, 79 make reciprocations in opposite directions. A member 81 is pivoted to the end of the link 32 so as to be capable of turning in a vertical plane and this member is formed with a toothed rack which is pressed by a spring-bolt 82 into engagement with a fixed knife-edge 83 to lock the link 32 against movement. The members 73, 79 are raised selectively by the jacguard device to release the link 81 and actuate it to displace the sewing mechanism. Feed by dogs. - The shifting of the work is effected by feed dogs 84 on members 87 one of which is linked to a pair of arms 88 extending from a shaft 90. An arm 91, Fig. 4, on the shaft 90 is connected to a forked lever 92 embracing a cam 34 and having a pivot 93<1> which engages a slot in an angularly adjustable member 94 by the inclination of which the lever 92 is caused to reciprocate vertically. The other feed-dog is held in position by arms projecting from a shaft 96 connected to the shaft 90 by a link and levers so that the two dogs move oppositely. The feed dogs are selectively lifted to engage the work by the jacguard device which comprises a polygonal drum 46 geared to the main shaft and having thereon pins which engage perforations in the plates of a pattern-chain. Projections on the chain-plates are adapted to engage the ends of four arms 107 mounted on arms 106 which when moved displace fingers 110 linked at their lower ends to levers 111. An abutment 118 on a forked lever 116 continuously moved up and down by a cam engages a displaced finger and effects the downward movement of the corresponding lever 111. Two of the levers have arms 119 which engage the arms 73, 79 of the needle displacing mechanism. The other levers have arms 121 connected by links 122 to turn shafts 124, Fig. 3 from which extend arms having a lifting engagement with the members 87.