| 摘要 |
1491832 Endless conveyers; varying spacing of conveyed articles GRAPHA-HOLDING AG 2 Feb 1976 [3 Feb 1975] 03979/76 Heading B8A A feed rate regulation device for increasing the speed of book blocks B as they are conveyed by an intermediate endless conveyer 4 between a low speed delivery conveyer 1 from a printing machine and a high speed supply conveyer 2 to a binding machine, comprises an endless member 27, 27<SP>1</SP> co-extensive with the carrying run of the conveyer 4, driven at the linear speed of the supply conveyer 2 and carrying driver elements 28 which are projectable into the conveying path of the blocks B on the conveyer 4 to accelerate a block engaged thereby for correct delivery speed to the supply conveyer 2. The intermediate conveyer 4 comprises a pair of parallel spaced belts between which the elements 28 project and is driven in synchronism through chain transmission 20, with the low speed conveyer 1. The endless member 27, 27<SP>1</SP> comprises a pair of vertically spaced parallel chains passing around sprockets 25, 25<SP>1</SP>, 26, 26<SP>1</SP> on vertical axles 23, 24 driven in synchronism with the high speed conveyer 2, through a chain transmission 31 and bevel gearing 29. The driven elements 28 are mounted between the two chains 27, 27<SP>1</SP> and each comprises a drive finger 41 spring biased into its upper block engaging position but movably held down in its inoperative position by a latch 47. As the elements 28 move along under the conveyer 4, the latches 47 are released permitting projection of the fingers 41, by projecting cams 13 on an endless phase chain 10 driven through a chain transmission 21a in synchronism with the conveyers 1 and 4, the cams 13 being synchronized to be in a position midway between two adjacent blocks B moving with the conveyer 4. The latches 47 are spring biased into their finger engaging position to relock the finger 41 in its inoperative position once it has been pulled downwardly by a static cam plate 53, 54 engaging rollers 43 on the fingers 41 during the return run of the elements 28.
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