UNIVERSAL COMPENSATING TENSION DEVICE

• US 3,575,360 A
• Filed: 11/20/1968
• Issued: 04/20/1971
• Est. Priority Date: 11/20/1968
• Status: Expired due to Term

• Current Assignee: John B. Lawson
• Original Assignee: John B. Lawson
• Inventors: Lawson, John B.
• Application Number:
  US04/777,352
• Time in Patent Office: 881 Days
• US Class Current: 242/150.00R
• CPC Class Codes: B65H 2701/31 Textiles threads or artificial strands of filaments
• CPC Class Codes: B65H 59/24 Surfaces movable automatically to compensate for variation in tension

Abstract

A device for maintaining constant tension in a moving strand of material comprising an arm moveable in response to changes in yarn tension between the device and the consuming utility, which movement is mechanically translated to alter the retarding force on the yarn which is exerted by a tension disc or wheel about which the yarn passes.

Claims

1. In a tension device for selectively applying tension to yarn, said device having a rock shaft, a rockable arm secured at one end to the rock shaft and having a yarn guide disposed at its distal end, A. Means for imparting a selected tension yarn including:

a. a spiral spring for biasing the rockable arm to impose the desired selected tension on the yarn, b. means for winding the spiral spring to selected spring tension, c. a drum containing the spiral spring having a succession of peripheral teeth disposed thereon, d. a detent for engaging the teeth to prevent rotary movement of the drum, e. a clutch plate for disengaging the detent from the drum teeth and f. resilient means urging the detent into engagement with the drum teeth; and

B. Yarn braking means for exerting a drag on the yarn as it passes to the yarn guide including;

a. an eccentric mounted on the rock shaft and responsive to rocking movement of the arm, b. a brake shaft on which the yarn braking means is mounted, said brake shaft being movable axially to increase or decrease the drag on the yarn, c. resilient means adapted to urge the brake shaft in a selected axial direction and d. transmission means disposed between the eccentric and the brake shaft in response to rocking movement of the arm.

2. The yarn tension device of claim 1 wherein the clutch plate and detent are integrally formed.

3. The yarn tension device of claim 2 further including a. an aperture in the clutch plate and b. key means for engaging the aperture in the clutch plate for disengaging the detent from the drum teeth.