Patent GB-1275038-A (GB)
Title: Improvements in or relating to setting devices for type cylinders
IPC: B41J7/32
Filed: 1971-04-21
Abstract: 1275038 Selective printing ADDO AB 21 April 1971 [22 April 1970] 10512/71 Heading B6F Type-cylinder machines.-A type-cylinder (2) is fastened to a shaft (3, Fig. 1) for axial and rotational movement in a unit (4). The unit (4) is pivoted at (5) by a cam follower (27) following a cam track (25), so that the typecylinder swings for impression. Aligning for impression.-A toothed wheel (7) also fastened to the shaft (3) is engaged by a fixation arm (17) pivoted to the mounting unit (4). When the type cylinder has been moved to its selected position, and in consequence the toothed wheel (7) also, the fixation arm (17) is pivoted by a cam follower (26) following a track (24) so that one of few grooves (19) receives the toothed wheel to align the axial position of the type-cylinder. At the bottom of each groove (19) there is a tooth (20, Fig. 20), which engages the toothed wheel (7) to align and retain the typecylinder in its selected angular position. With the fixation arm (17) retaining the typecylinder in its selected position, the combination selection device (see below) is free to be set for the next character selection cycle. Combination type-setting mechanisms.-The axial position of the type cylinder (2) is set by a bell-crank lever (11) drawing a bifurcated first-end which engages a groove (10) in a sleeve (9) fixed to the shaft (3). The other end of the lever (11) carries a stud (13) which is arranged to engage one of a number of abutments 41 formed on two slides 32, 33, Fig. 2. The slides are moved downwards by springs 36, 37 and upwards by a cam 49. The positions of the slides at each character selection cycle is governed by two electromagnets 30a, 30b, whose armatures 31a, 31b can engage abutment shoulders 38, 39, 46, 47 formed on the slides. A particular abutment 41 is presented its stud (13) depending on the state of the electromagnets. When the lever (11) pivots under the influence of a spring (42), its final position is governed by the particular abutment 41 selected, thereby selecting the axial position of the type-cylinder. The lever (11) is returned to its starting position by a cam (43). A rack slide (16, Figs. 1 and 4) engages a gear wheel (14) fastened to the shaft (3), and its linear position governs the angular position of the typed-cylinder. The rock (16) has two slots (64 and 65) and is guided by two pins (66 and 67) which engage in these slots. A third slot (62) accomodates the ends of three slides (51, 52, 52, Figs. 3, 4), which are provided with abutments (61, 63) which govern the position of the slide (16). The slides (51, 52, 53, Fig. 3) are formed principally in the same manner as the slides 32 and 33, Fig. 2, and their positions are governed by the states of three electromagnets (30c, 30d and 30e) which give rise to eight possible positions of the rack slide (16) in one direction of movement, and eight positions in the opposite direction. The state of a sixth electromagnet (30f, Fig. 4) governs which of two pivoted drive arms (72 or 73) moves the rack slide (16) in one or other of the opposed directions of movement against the selected combination of abutments (61 or 63), thereby setting the angular position of the type-cylinder.