GB777550A - Improvements in or relating to embroidery machines - Google Patents

Abstract

777,550. Sewing machines. MASCHINENFABRIK BENNINGER AKT.-GES. Oct. 6, 1955 [Oct. 15, 1954], No. 28539/55. Class 112. In a Heilmann type embroidery machine bars 24,24<SP>1</SP>, each carrying a row of holders 25, 25<SP>1</SP> for needles 26, are disposed on opposite sides of the work fabric C carried by an embroidery frame, and each needle bar is associated with a respective separate thread take-up carriage 1, 1<SP>1</SP> provided with thread-holding means 5, 5<SP>1</SP>, the arrangement being such that the threads a, when partially pulled through the work, are taken by the holders on one carriage while the threads still held by the holders on the other carriage are released through appropriate movement of the latter holders. The carriage 1 runs on wheels 2 upon fixed tracks 3, and is driven towards and away from the work by means of an endless chain 23 which is fixed to the axle of one of the wheels and engages a sprocket 22 carried by a driving axle 21. The thread holders 5, which are in the form of rollers and which normally project above the surface of the carriage, are mounted on a bar 4 carried by a lever 6 pivoted on the carriage, said lever being connected by a link 7 to one arm 8 of a double armed lever pivoted at 9 on the carriage, the other arm 10 carrying a roller 11. A guideway 12, carried by a guided rod 52, is adapted to be raised and lowered by a rod 16 into and out of the path of roller 11, whereby the latter, when engaged in guideway 12, is lifted so as to lower the holders 5 below the surface of the carriage. A rectangular frame 56, projecting from bar 24, rests on a horizontal bar 55 carried by a fixed bracket 40, whereby bar 24 can move freely, within limits, in a horizontal plane. A rod 27, coupled to bar 24, is adapted to move the latter parallel to the work. A link 34 connects bar 24 to a crank 35 carried by a shaft 36 journalled in bracket 40, whereby rotation of shaft 36 serves to move bar 24 transversely to the work. A shaft 41, journalled in bracket 40, carries a cam 54 adapted to co-operate with a vertically slidable bar 53 for opening and closing the jaws of the needle holders 25. The opposite carriage, and needle bar are of similar construction, the corresponding parts being denoted by primed numerals. As shown in Fig. 3, the machine comprises two independent embroidering stations disposed one above the other, the controls for the lower station being driven from a gear box 13 disposed at one end of the machine and being operatively coupled to the controls of the upper station. Rod 16 is connected to the lower guideway 12 and is also connected to a crank carried by a driving shaft 14 ; and the lower arm 10 is connected by rod 51 to the upper arm 10. The lower and upper spindles 21 are connected together by an endless chain and the lower spindle is also connected by a chain 20 to a driving shaft 19. Both rods 27 are connected to respective cranks carried by a vertical shaft (not shown) and the latter is connected by linkage 31, 32 to the gear box. The shafts 36 are connected by cranks 37, 48 and rods 38, 47 to a driving crank 39, and the shafts 41 are connected by cranks 42, 50 and rods 43, 49 to a driving crank 44. The pattern-forming movements of the embroidery frame are produced by a pantograph having a feeler which is moved over an embroidery pattern. When the machine is started from the position shown in Figs. 4, 5, in which the threads a are stretched around the holders 5, guideway 12 is raised, needle bar 4 moves sideways to align the needles with the holders 251 and then towards the work to transfer the needles to holders 25<SP>1</SP>. Needle bar 24<SP>1</SP> then moves rearwardly and sideways and guideway 12<SP>1</SP> is simultaneously lowered to raise the holders 5<SP>1</SP>, whereby the threads are looped around the latter. The machine then stops. The carriages are then movable simultaneously by means of a handle-operated shaft 18, when the holders 5<SP>1</SP> draw the threads through the work and the holders 5 are lowered to release the threads when the roller 11 engages the raised guideway 12. Carriage 1 then becomes uncoupled from the hand operated shaft, when carriage 1<SP>1</SP> may be moved sufficiently to draw the threads fully through the work.