GB904729A - Improvements relating to spring unit lacing machines - Google Patents

Abstract

904,729. Assembling upholstery springs. VONO Ltd. June 21, 1961 [June 25, 1960], No. 22330/60. Class 83 (4). [Also in Group XIV] In a machine of the type described in Specifications 653,021 and 859,163, for lacing together parallel rows of springs 16, 17 and 17, 18 by a helical wire 19 the end 20 of the helix is bent around the end coil of the end spring 17 in the row of springs next to leave the jaw assemblies 14, 15 which hold the spring while the helix 19 is threaded. An anvil member 41 is fixed to the assembly carrying the rear jaw 15 so that when the spring 17 is in position on the jaw the end 20 of the helix is located on the anvil face 43. The end 20 is bent around the coil 17 by the reciprocating bending tool 24 which slides in a sleeve 25 mounted on the fixed bar 23 by means of the L-shaped bracket 26, 27 and nut 29. The working end of tool 24 is suitably shaped and the other end carries a disc 35, between which and the sleeve 25 is a compression spring 36, and a ball 37 seated in a recess, the edges of which have been peened over. The tool is actuated by a cam surface 40, engaging ball 37, formed in the cam block 39 secured to presser bar 38 and thus bends the end 20 when the next helix is just about to be threaded. Similar tools are provided at each end of the helix and for both the helices located on the top and bottom coils of the springs. The tools may have a cutting edge to cut the helix ends to standard length. Coils 16, 17, 18 are shown in Fig. 2, slightly displaced to the left (front of machine) for clarity.