Patent GB-191941-A (GB)
Title: Improved apparatus for delaying the delivery of newly printed or coated sheets
IPC: B41F23/04
Filed: 1921-12-28
Abstract: 191,941. Johnston, T. R. Dec. 28, 1921. Delivery apparatus. - Relates to apparatus for preventing set-off from newly printed or coated sheets by delaying their delivery, and comprises three arrangements wherein the sheets are caused to descend face upwards from one series of travelling tapes to anothes series at lower level without the faces of the sheets being touched. The apparatus shown in Figs. 1 and 3 comprises two series of endless tapes, one series stretched round pairs of rollers a<1>, b<1> - - a<5>, b<5> and the other series stretched round pairs of rollers c<1>, d<1> - - c<4>, d<4>. Each pair of rollers is kept at the correct distance apart by rods e<1>, and the two series of roller pairs are connected together by vertical bars h<1>, j<1> respectively, so as to be movable backwards and forwards along guide bars k<1>. The shaft of the top roller b' of one series carries a rigid pinion b<7> in gear with a rack b<8> on the frame f<1>, and is also geared by a chain b<10> to pinions on the lower rollers b<2>, b<3>, b<4> whereby the rollers are rotated in unison as they reciprocate between the full and dotted line positions shown in Fig. 3. The rollers c<1> - - c<4> are similarly geared together by the chain c<8> and driven in unison by the engagement of a pinion c<6> on the shaft of the roller c<1> with a rack c<7>. Each series of tapes is moved out to the left and back again, followed by a rest during which the other series is given a like movement, by means of a cam s', runners h<10>, j<10> and rods h<9>, j<9>, connected to cranks h<8>, j<8>, on short shafts h<6>, j<6>, the shafts carrying arms h<5>, j<5> connected by links h<4>, j<4> to the bars h<1>, j<1>. A printed sheet is deposited on the a<1>, b<1> tapes whilst they are at rest by the chain delivery m<2>, at which time the other series of tapes are moving to the right. Thereupon the a<1>, b' tapes move to the left and drop the sheet on to the then stationary c', d<1> tapes. As the latter move to the left, the shee tis deposited on the a<2>, b<2> tapes, and then successively from the tapes of one series to those of the other series and finally on to the a<5>, b<5> tapes. The roller a<5> is driven independently by a rack a' through a loose gear wheel a<8> carrying a pawl engaging a ratchetwheel rigid on the shaft of said rollers so that the latter is rotated only as it moves to the right in order to deposit the sheets on to the delivery board g<2>. In the modification shown in Fig. 5, the two series of tapes a', b<1> - - a<6>, b<6> and c<1>, d<1> - - c', d<7> are mounted end to end in fixed supports, and are all driven alternately in opposite directions by means of the sliding rack h<4> and gears h<5>, h<6>, the latter engaging a pinion d<8> on the roller d<7>, which drives the other rollers through chains d<10>, d<12>. c<10> and a<9>. The b rollers are carried by rods k<1> guided in sleeves k<2>, k<3> and in the operation of the machine are raised and lowered by the cam mechanism j<1> - - j<4>. A printed sheet, deposited by the chain delivery f<2> on to the c<1>, d<1> tapes is then run on to the a<1>, b' tapes, then by the dropping of the roller b<1> on to the c<2>, d<2> tapes, and so by successive transfers to the lowermost c<7>, d' tapes, from which it is delivered to the delivery board g<2>. In the modification shown in Fig. 8, the printed sheet from the chain delivery g' is conveyed by the tapes a<1>, driven by chains a<8>, to the tapes b<1>, driven by chains b<7>, whereupon the roller b<4> of the tapes b<1> is lowered from the position b<10> to allow the sheet to be passed backwards on to the tapes c<1>, driven by chains c', and thence to the delivery board d<2>. The tapes a<1>, c<1> are driven intermittently in the direction shown by the arrows, and the tapes b' are driven in opposite directions alternately, by the following mechanism. Slides b<8> are reciprocated along bars b<6> by a link f<9> and lever arm f<8> on a shaft f<6> which is oscillated by a crank f<5>, connecting rod f<3> and crank pin f<2> on a cam f<1>. The chains b', passing round the rollers b', b<5> of the tapes b', are engaged by projections on the slides b<8>. Links f<11> connect the latter to slides a<9> on guides a<10> alongside the driving-chains a<8> of the rollers a<6>, a<7> of the tapes a'. The slides a<9> carry pawls a<12> adapted to engage successively studs a" - - a<16> spaced along the chains a<8>, the pawls slipping over a stud during the movement to the left and engaging it during the reverse movement to pull the chain forward. Similarly, the chains c<8> driving the tapes c<1> are driven by means of pawls c<12> on slides c<9> connected by links f<12> to the slides b<8>. The roller b<4> of the tapes b<1> is raised and lowered by the cam mechanism f<12> - - f<15>. Specifications 18816/10 and 8102/12 are referred to.