Improvements in or relating to straight-bar knitting machines which are electricallydriven


523,596. Knitting-machines. BLACKBURN & SONS, Ltd., G., START, H. W., and START, E. Dec. 6, 1938. No. 35480. [Class 74 (ii)] Automatic speed control mechanism for electrically driven straight - bar knitting-machines comprises three parallel slides A, B, C. Slide A is connected to the manually operated control rod F of the machine. Slide B is connected to the motor speed regulator, which may be of the induction type. Slide C is connected to slowing-down mechanism associated with the knitting-machine. Slide B carries a plate E with two pivoted hooks G, H by which the slides A, B, or, alternatively, the slides B, C can be coupled together. The hooks carry striking parts, G', H<SP>3</SP> engageable by spring tappets K<SP>1</SP>, L<SP>1</SP> on the slides A, C and are linked together at J. When one tappet K' or L' engages the part G' or -H<SP>3</SP>, the corresponding hook G or H is hooked on to a stud K or L, while the other hook is released. Assuming that the slides A, B are coupled and have been moved far enough .to the left to give the machine the maximum speed required and are left in this position, the speed can be reduced by moving the slowing-down slide C to the right until the slides B, C are coupled and the slides A, B uncoupled. The slides B, C can now be moved further to the right to reduce the speed of the machine to the required extent, leaving the slide A in its maximum speed position. When the maximum speed is again required, slides B and C move to the left, until at the completion of this movement, slides B C are uncoupled and slides A, B are coupled: The slide C is connected by a link to arms M<SP>1</SP>, M<SP>2</SP> on a rocking shaft M which is angularly adjusted by a lever N. A stop N' releases lever N at intervals as determined by studs on the controlling chain, or holds lever N out of action. A second stop N<SP>2</SP> limits the movement of lever N towards its cam, when released by stop N<SP>1</SP>. The lever N when released by stop N' will follow its cam until cheeked by stop N<SP>2</SP> and this movement will be communicated to slide B and the speed of the machine slowed down. The.inductor regulator P is fitted with rotary switch gear on the axle of which is a pinion P' engaging a toothed segment Q mounted on an arm Q<SP>1</SP> connected to slide B so that movement of slide B rotates pinion P' and adjusts regulator P.




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