INDEXING CORE HOLDER FOR A TOROIDAL WINDING MACHINE

• US 3,618,868 A
• Filed: 03/27/1970
• Issued: 11/09/1971
• Est. Priority Date: 03/27/1970
• Status: Expired due to Term

• Current Assignee: Bohuslav Vavrinec
• Original Assignee: Bohuslav Vavrinec
• Inventors: Vavrinec, Bohuslav
• Primary Examiner(s): Taylor, Billy S.
• Application Number:
  US05/023,409
• Time in Patent Office: 592 Days
• Field of Search: 242/4,158.4 74/142,141
• US Class Current: 242/434.9
• CPC Class Codes: H01F 41/08 Winding conductors onto closed formers or cores, e.g. threading conductors through toroidal cores
• CPC Class Codes: Y10T 74/1555 Rotary driven element

Abstract

Small rectangular toroidal cores are held for winding by a pair of clamping jaws mounted on a slide to be indexed for precise placement of the winding by a reversible, step-by-step transmission. The transmission includes a driven cam acting through a stepping pawl and ratchet means to drive associated gearing terminating in a rack carried by the slide. The direction of indexing is reversed by a shiftable, two-way bevel clutch in said gearing. The clutch is controlled by adjustable switchactuating means carried by the slide and operably connected to clutch-operating means.

Claims

1. A clamping head adapted to perform a straight-line, step-bystep movement with the possibility to reverse this movement, particularly for clamping of cores on coil-winding machines comprising in combination:

a frame, a sliding board mounted in sliding fashion on this frame, a couple of adjustable clamping jaws arranged on said sliding board, a rack fixed to said sliding board, a shaft, supported rotatably and axially shiftably by said frame, a first part of a two-way bevel clutch fixed to said shaft, two second parts of the bevel clutch mounted freely rotatably on said shaft, adapted to engage alternately with side first part, a bevel gear with a pinion supported by said frame, said bevel gear meshing with both second parts of the bevel clutch, said pinion meshing with said rack fixed to the sliding board, a ratchet wheel with pawls for one-direction, step-by-step movement fixed on said shaft, means for transmitting to said ratchet wheel an intermittent rotary movement after finishing one turn of the coil, limit switches actuating means for changing the position of the two-way bevel clutch.

2. A clamping head as claimed in claim 1 said means for changing the position of the two-way bevel clutch comprising an electromagnet energized in the course of feeding of the sliding board in one direction and acting on the shaft of the bevel clutch, with a spring force returning the shaft of the bevel clutch into the opposite position for feeding the sliding board in the opposite direction.

3. A clamping head as claimed in claim 1 the shaft supported rotatably and axially shiftably in adjustable sleeves, the extremities of said sleeves facing the first part of the bevel clutch forming races for antifriction thrust bearings of both second parts of the two-way bevel clutch.

4. A clamping head as claimed in claim 1 said sliding board guided by three-point ball guidings with two balls guided in a groove of a frame part on one side and a third ball guided in a groove of a second frame part on the other side, one of said frame parts spring loaded to eliminate any clearances.

5. A clamping head as claimed in claim 2 comprising limit changeover switches for energizing and deenergizing the electromagnet changing the feeding direction of the sliding board after it has reached its extreme positions.