| 摘要 |
Disclosed is a vacant package-proofing control device for a packaging machine having: a motor (A) for driving a conveyor (12) for feeding articles (10) to be packaged with a predetermined space therebetween into a packaging material (16) which is delivered downstream being formed into a tube; a motor (B) for driving a series of rolls (18,34) which deliver downstream the packaging material (16) being formed into a tube; and a motor (C) for driving a pair of sealers (10) for achieving end-sealing of the packaging material (16) having been formed into a tube in the crosswise direction relative to the line of feed, characterized by the constitution comprising: an absence detecting sensor (42) disposed at a predetermined position upstream the point of transferring articles (10) to be packaged from said conveyor (12) for detecting absence of packaging articles (10) being transported on said conveyor (12) with a predetermined space therebetween; a reference timing pulse generating means (S1) which generates predetermined reference timing pulses for the timing of feeding the packaging articles (10) from said conveyor (12); and a means for stopping the motor (B) for feeding the packaging material (10) and the motor (C) for achieving end-sealing under gradual deceleration, provided that coincidence of an absence detection signal from the absence detecting sensor and a timing signal from the reference timing pulse generating means (S1) should occur, and after a duration of stopping them for the number of cycles corresponding to the number of absent packaging articles (10), to start gradual acceleration of these two motors (B,C) until the speeds and phases thereof may be synchronized with those of the motor (A) for driving the conveyor (12). |
