Patent GB-773520-A (GB)
Title: Improvements in or relating to automatic embroidering and the like machines
Inventor: SCHEIBEL KURT
IPC: D05C3/04
Filed: 1954-12-31
Abstract: 773,520. Sewing machines. VEB SPEZIALNAHMASCHINENWERK LIMBACH. Dec. 31, 1954, No. 37818/54. Class 112. In a Jacquard device for embroidering machines, in which the Jacquard needles are moved towards the pattern card while the latter is stationary, the needles are yieldingly connected to common drive means. As shown in Fig. 2, a pair of needles 15 are carried by respective bars 3, 4 slidably mounted in a driver 1 which is arranged to be constantly reciprocated on a bar 2. The bars 3, 4 are coupled to the' driver by means of spring- biased plungers 5, and noses 7 on the members normally abut the driver. Bar 3 is formed with a curved slot 11 engaged by a roller 10 carried by one arm of a bell crank lever 8 pivoted at 9. A reversely curved slot 12 in bar 4 is engaged by a roller 10 on one arm of a bell crank lever 19 also pivoted at 9. The other arms of levers 8 and 19 are respectively pivoted at 16 and 18 to a lever 17 the free end of which is pivoted to a link 20 which is formed with a rack 21 and also with a slot 24 slidably engaged by a pin 23 on a lever 22. The pattern card 14 is driven in successive steps by a perforated drum 13. As shown, the driver has moved towards the card and the needle on bar 3 has passed through a perforation on the card, while the other needle has encountered an unperforated part of the latter, whereby bar 4 has remained stationary, the associated plunger 5 sliding along member 4. Lever 8 is thereby rocked and so rocks lever 17 about pivot 18 to move rack 21. Lever 22 is then raised to engage rack 21 with a gear 25 the axis of which carries a pinion 26 engaged with a rack 27 coupled to means for operating the embroidery frame. When the driver moves away from the pattern card, it co-operates with nose 7 on bar 3 to move the latter, whereby lever 17 returns to its original position and so drives rack 27. Lever 22 is then lowered to disengage rack 21 from gear 25. If bar 3 remains stationary while bar 4 moves, lever 17 will rock about pivot 16 to effect movement of rack 27 in the reverse direction. In a modification, the plungers 5 are replaced by tension springs connected between the driver and the respective noses 7. In a further modification, Fig. 6, four needlecarrying members 31 are pivoted on a pin 32 and carry respective curved needles 35. A driver 43, fixed to pin 32 and arranged to be oscillated therewith by a link 44, is formed with a head 45 which is movable in a notched portion 36 in members 31 and carries four spring-biased plungers 46 each of which normally engages a notch in a member 31. A link 39 is pivoted at 38 to the first member 31 and at 40 to the middle of a lever 41. A link 51 is pivoted at 48 to the second member 31 and at 54 to the upper end of lever 41. A link 52 is pivoted at 49 to the third member 31 and at 40 to the lower end of a lever 55, and a link 53 is pivoted at 50 to the fourth member 31 and at 54 to the middle of lever 55. A lever 57 is pivoted at 56 to the lower end of lever 41 and at 58 to the upper end of lever 55, the free end of lever 57 being pivoted at 59 to the rack-carrying link 20. The ends of lever 57 are disposed in guides 60, the lower end being rounded and being supported by the guide. The arrangement of the linkage is such that pivot 32 is normally aligned with pivots 50, 48, 54 and also with pivots 38, 49, 40. If the first needle passes through a perforation, the other three needles remaining stationary, lever 41 will rock clockwise about pivot 54 to rock lever 57 clockwise about pivot 58. If the second needle passes through a perforation, lever 41 will rock anti-clockwise about pivot 40 to rock lever anti-clockwise about pivot 58. If the third needle passes through a perforation, levers 55 and 57 will rock clockwise about pivots 54 and 56 respectively, and if the fourth needle passes through a perforation, levers 55 and 57 will rock anti-clockwise about pivots 40 and 56 respectively.