Dispositif applicable aux machines à coudre, en vue de l'obtention automatique de piqûres d'ornement

摘要

929,018. Sewing-machines. GEORG UTZ A.G. July 22, 1959 [July 23, 1958], No. 25076/59. Class 112. A sewing-machine attachment comprises a casing securable to the sewing-machine presser bar, an arm 9 engaging the needle carrier 14 on the needle bar to be oscillated thereby and turn step-by-step a shaft 6 pivoted in the casing. Rollers 24, 25 on a control slide 23 engage control cams 20A, 20B on the shaft 6 to reciprocate the slide as the shaft turns. A lever 27 pivoted to the casing at 28 carries at one end a foot 71, the other end being provided with a slide block 30 engaging a slide 26 disposed at one end of a shaft journalled in an eccentric bush 31 carried in the control slide 23. The angular position of the slide 26 can be varied by a knob 32 to vary the amplitude of the cross-wise oscillation of the foot 71 as the control slide 23 reciprocates. The bush may be rotated in the slide by a lever to vary the position of the centre of oscillation of the foot. The lever 9 is provided with a segment 66 and a slot 50 through which projects a lug of a balance member 48 freely pivoted on the shaft 6. The balance member is thus engaged and oscillated by the lever 9 as the needle bar reciprocates, and a bolt 51 (see Fig. 6) on the balance is embraced by the forked end of a lever 52 pivoted at 53 to one end of a lever 54 itself pivoted 60 to the casing. A slide block 56 carried on the lever 52 is engaged in a slide 57 pivoted to the casing. The angle of the slide is varied by a lever 63 to vary or reverse the movement given by the bolt 51 to the levers 52 and 54. A material feed bar 62 having at one end a feed foot 621 disposed in slots in the foot 71 is connected at its other end to the lever 54, so that the foot 621 may feed material as the balance 48 oscillates. To this end a pressure part 70 on one end of a lever 68 pivoted at 69 to the casing is periodically pressed down on to the foot as the segment 66 on the arm 9 engages a roller 67 on the other end of the lever 68. The Specification also describes (Figs. 16 to 20, not shown) other means by which cams can actuate the control slide, and (Fig. 21, not shown) an arrangement in which a cam replaces the balance 48. Fig. 22 (not shown) shows how a set of cams may be releasably fastened to the shaft 6.