New or Improved Motion Transmitting Mechanism for Embroidery Machines.

  • Inventors: KARL KELLER
  • Assignees: Karl Keller
  • Publication Date: November 30, 1911
  • Publication Number: GB-191115736-A


15,736. Keller, K. July 7, 1910, [Convention date]. Embroidery machines. - The pantograph which controls the movement of the frame of an embroidery machine is not directly connected to the work frame but its motion is transmitted by a link parallelogram pivoted at one angle to the fixed pivot of the pantograph. The angular movements of the pantograph members which turn about the fixed pivot are communicated to the corresponding members of the transmitting- parallogram by mechanical relay devices constructed as follows. A slide 5 is mounted in an extension 1 of the pantograph member. A lever 12 is pivoted to the slide 5 and receives in a slot 14 a bowl 24 on an extension 3 of the member of the transmitting parallelogram. The lever 12 carries a pawl 16 which engages with a toothed segment on the slide 5 to lock the slide and the lever 12 together. Initially, the bowl 24 and the pivot of the lever 12 are in line, Fig. 6; a spring 15 has brought the lever 12 into the central position shown and, a screw 20 having entered a recess in the curved stop 22, the pawl 16 has locked the lever and guide together. Both arms 1, 3 are locked. A conical cam 9 moves to the right, and a spring 8 moves the guide away from the shaft. When the screw 19 impinges upon a curved stop 21, the locking-pawl 16 is removed. Upon the operation of the pantograph, the arm 1 is unlocked and is moved relatively to the arm 3, bringing the lever 12 into the position shown in Fig. 4. The arm 1 is then locked, and the arm 3 released. The cam 9 moves to the left and returns the guide towards the shaft. Immediately the screw 19 leaves the stop 21, the pawl 16 engages the segment 17, and thereafter the inclined slot 14, being locked to the arm 1, causes the arm 3 to move into line with the arm 1. At the completion of the stroke, the stop 22 releases the pawl, and the spring 15 brings the lever '12 into its central position again. The pantograph arms are locked by means of a bar extending from one of them, which passes between a fixed abutment-plate and a cam-actuated eccentric roll. The arms of the transmitting-parallelogram are locked by means of a similar bar extending from the workframe.




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