Patent GB-1361475-A (GB)
Title: Apparatus for joining together two pieces of work fabric or similar materials
IPC: D05B21/00
Filed: 1971-11-03
Abstract: 1361475 Sewing machine BROTHER KOGYO KK 3 Nov 1971 [5 Nov 1970] 51060/71 Heading DIG The Specification discloses a machine which assembles two articles, a shirt cuff and a sleeve, in suitable relationship, and seams the articles together. Work holding &c. The sewing-machine 12 is provided with a drum bed 34, Figs. 4, 5, secured to a shaft 41 projecting from the front of the machine and connected by gears 37, 43 (of ratio 1:3) to an intermediate shaft 41 oscillated by a cam 56 driven from the main shaft 24. That latter drive includes a bell crank lever 58 which is spring urged in one direction (B, Fig. 6 not shown) but may be urged in the other direction by a pneumatic ram 66. The cam 56 rotates the drum bed 34 through 180 and a set of reed switches at 78 are operated by the cam shaft at selected positions of the drum bed. The rear of the drum bed is stepped at 34d to receive around it's upper portion a cuff support 85 which is spring biassed theretowards but which may be raised by the abutment of rams 178, 179 with rods 92, 93. Within the lower part of drum bed 34 are pivoted cuff catchers 104a, 104b provided at their ends with cuff catching pawls (105a, Figs. 10-12 not shown). The catchers 104a, b are spring biassed away from each other but may be drawn together by a ram 121. Two main cuff holder supports 146, 147 are provided which present curved keep plates 152, 153 having forward edges aligned with that of drum 34. The plates 152, 153 are spring urged towards the drum and are movable away therefrom by rams 156 and 157. The rear end of cuff support 85 carries a supplementary cuff holder support 158 constructed in a similar manner to support 146 and operable by a ram 163. Below the drum is a drum stop device comprising a lever 171 spring biassed to engage a stop on the drum when the latter is in a 'bed central' position. A ram 167 can withdraw the device against the action of the spring. A sleeve end holder unit (see also Fig. 14) is mounted on a shaft 193 vertically slidable on a base 184 itself slidable horizontally along guides 182, 183 by a ram 188. The shaft 193 is biassed downwardly by a spring but may be raised by a ram 196. The holder unit comprises holders 198, 199 carried on a shaft 197 and supporting a plate 202 connected to combed members 200 (and 201, Fig. 15 not shown) to move these towards and away from the drum 34 when a ram 211 is actuated. A further ram 223 operates levers 221 to move them against the sides of sleeve holders 198, 199. A tucking device 237 operated by a ram 232 and a further holder 246 for the sleeve end, operated by the ram 244 are also mounted on the holder unit. Sewing instrumentalities, thread cutter driving, alarm, counter. The needle 26 and looptaker 136 are both driven from shaft 24 while a loop taker stopper 138 and a two bladed thread cutter 140 are operable by a ram 144. Switches detecting the position of movable parts are provided and incorporated in an electrical control system (Fig. 22 not shown) which actuates valves supplying air to the rams and controls the machine driving devices which comprise a high speed and a low speed motor (Figs. 20, 21 not shown) incorporating clutch brake facilities and co-operating with an armshaft device 319 to stop the machine with needle at a specified position. A detector lamp monitoring the bobbin thread and a stitch counter are also incorporated. Operation. Ram 66 moves cam lever 58 against its spring and rotates the drum bed to a central position where lever 171 engages it's stop. Cuff holders 150, 151 and 160 and the cuff support 85 descend under spring action. Ram 223 operates to close left and right sleeve end holders 198, 199 which are raised with holder 192 by ram 196. Combed members 200, 201 are advanced by cylinder 211. Rams 156, 157 lift the main sleeve end holders 150, 151 and ram 163 opens auxiliary cuff holder 160. A cuff X (Figs. 31, 32) is placed on the forward section of the drum with the cuff opening Xa disposed forwardly. Cuff catchers 104a, 104b engage their pawls 105a, 105b in the opening. Depression of a pedal operates ram 121 and the cuff is secured at two points each 2 cm. in from the edges. Ram 163 ceases to operate and auxiliary cuff holder 158 moves down. The tucking device is manually reset and the right-hand sleeve end Y of a shirt is mounted over the advanced combed members 200, 201. Switches (335, 336) are closed manually to supply air to rams 232 and 344 to secure the right and left sides of the sleeve to the combed members. The tucking mechanism then pleats the sleeve. Actuation of a start switch (342) causes rams 179, 190 to lift the cuff-holder 85 to raise the cuff with the lower edge Xb of the cuff opening Xa fixed, the opening thus expanding widely. Ram 188 moves the sleeve end holder forward to enter the sleeve end into the opening, when rams 178, 179 are de-energised and holder 85 falls to close the cuff opening. Sleeve end holders 198, 199 then expand the sleeve end within the cuff opening and sewing takes place as the drum rotates. Grouped machines. Two such units, each with a sewing machine and drum bed, are arranged side by side (Figs. 1 and 2 not shown).