| 摘要 |
<p>1478543 Synchronous box-making line UNITED STATES BOX CORP 3 Oct 1974 [5 Oct 1973] 42877/74 Heading G3N A line of box-making machinery includes an apparatus for synchronizing the operation of a blank cutting and web-feed mechanism 30 with the operation of a box-forming mechanism 40 independent of fluctuations in the speeds of respective independent motors, by which the mechanisms 30, 40 are driven from a nominal speed. The synchronizing apparatus comprises first, second and third cams (66, 70, 82) Figs. 4 and 6 (not shown) and first, second and third switches (74, 78, 94), Figs. 4, 6 and 7 (not shown) actuable thereby. The first and second cams (66, 70) are rotated together on a common shaft by the box-forming mechanism motor so that they each perform a single revolution for every cycle of the box-forming mechanism and actuate the first and second switches (74, 78) during different portions of each said cycle. The third cam (82) is rotated by the cutting and advancing mechanism motor so that it performs a single revolution for every cycle of the cutting and advancing mechanism 40 and actuates the third switch (94) during a portion only of said lastmentioned cycle. When the required degree of synchronization exists between the mechanisms 30, 40, the first switch (74) is closed, the third switch (94) is opened and the second switch is opened successively to permit continuous running of the cutting and advancing mechanism motor (154), Fig. 7 (not shown) which is in a circuit with the switches (74, 78, 94). However, if the second and third switches (78, 94) happen to be in an open state simultaneously, the motor (154) is de-energized and subsequently energized in synchronism with the box-forming mechanism motor by closing of the switch (74). Further cams (86, 90) Fig. 6 (not shown) are rotated with the third cam (82) and actuate switches (98, 102) simultaneously with actuation of the third switch (94) to energize independent motors for a web imprinter 26 and a web die press 28. The third cam (82) is arranged to actuate the third switch (94) as the cutter 36 operates on the web. The web is drawn from a roll 12 and around a dancer roller 25 which is mounted on the free end of a pivotal rod 18, by feedrollers 32. Unwinding of the web from the roll is controlled by a clutch actuated by engagement between switches 50, 52 and the rod 18. Additional switches 56, 58 which are in a circuit with the cutting and advancing mechanism motor (154), cause de-energization of this motor when they are engaged by the rod 18.</p> |
