SPIRAL TYPE STRETCH PACKAGING MACHINE
PROBLEM TO BE SOLVED: To perform a film feed rate control extremely close to a program control system in a follow-up control system by disposing a film speed detecting means at a position between a film feeder and an article to be wrapped and automatically and steplessly accelerating or decelerating...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To perform a film feed rate control extremely close to a program control system in a follow-up control system by disposing a film speed detecting means at a position between a film feeder and an article to be wrapped and automatically and steplessly accelerating or decelerating driving power sources for stretching rollers. SOLUTION: A non-driving roller 13a is disposed between an article to be wrapped and a film feeder 10, a rotational speed detecting means such as a pulse encoder 13b emitting pulse signals, for example, 2,000 times per rotation is mounted to the roller 13a, and stretching rollers 11, 12 are driven on the basis of the signals from this detecting means. For example, by rotating driving means such as AC survomotors 14, 15 which are driven for one rotation by 4,000 pulses, a rate required for feeding a film is determined within the range of errors of about one-ten thousandth, and a film feed speed is varied within 1/100 seconds on the basis of the required film feed rate thus determined, whereby a film feed rate can be controlled with accuracy extremely close to a program control system as a matter of fact. |
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