GB1036778A - Improvements in or relating to sheet folding apparatus - Google Patents

Abstract

1,036,778. Sheet folding apparatus. E. A. TIMSON. Jan. 27, 1965 [Jan. 28, 1964], No. 3705/64. Heading B6H. A sheet folding apparatus adapted to fold seriation varying sizes of printed sheets comprises a first folding device A including a blade cylinder 1 and a jaw cylinder 2 and one or more buckle folding devices B and C, including folding rollers 22, 23 and 22, 28 respectively, the rollers co-operating with respective folding plates 17, 18 and 24, 25. A printed web W is delivered from the associated printing machine to a rotary cutter 13, having a cutting cylinder 14 for cutting the web into sheets 5, which are fed by tape-feed conveyers 15, 16 to grippers 10 associated with the blade cylinder 1. To effect a commensurate variation of the distance between the first fold produced by the folding blade 3 with respect to the leading edge of the sheets the distance between the cutting cylinder 14 and the grippers 10 and the circumferential distance between the grippers 10 and the blade 3 is adjustable. When the grippers 10 have transferred the sheets an appropriate distance around the blade cylinder 1 the leading edge is released to permit the radially movable folding blade 3 to co-operate with a jaw 4 on the jaw cylinder 2 to form a first fold. The thus folded sheets are then fed by an endless tape feed conveyer 11, 12 to the buckle folding device 3 where they abut an adjustable stop 20 (Fig. 4, not shown) contained between folding plates 17 and 18, said abutment causing the sheets to enter a nip formed by the folding rollers 22, 23, which impart a second, parallel fold. A third parallel fold may be imparted to the sheets by the buckle folding device C. Gripper mechanism.-The grippers 10 are mounted on blocks 30 (Fig. 3, not shown), secured on a pivotal spindle 31, having at one end thereof an arm 32 which carries a roller 33 engaging in a cam groove 53a of a pivotally mounted cam 53, which controls the release of the sheets. The pivotal mounting of the cam 53 varies the circumferential distance between the folding blade 3 and the grippers 10 to vary the position of the first fold on sheets of varying sizes.