| 摘要 |
An adjustment and automatic inward-contraction and outward-expansion machanism, and particularly a single mechanism that provides the function of variable specification adjustment as well as automatic inward-contraction and outward-expansion of the claw arms during operation is described. The mechanism includes a worm provided for driving the worm gear and other related devices in rotation so that a cylindrical groove cam is engaged in motion up and down. With the cylindrical groove cam in motion up and down and further by means of L-type steering block, push and pull rod and four-bar linkage, claws are provided for specification adjustment. During the operation of the machine and when the roller of the plunge rod under L-type steering block is in rotation along the groove of the cylindrical groove cam, due to the undulations of groove, the plunge rod is in motion up and down and causes the contraction and expansion of the claw arms by means of the L-type steering block, the push and pull rod and the four-bar linkage, so as to meet the requirement of expanding the mouth of the bag and the operations prior to the sealing treatment. The present mechanism not only can adjust the distance between the claw arms subject to the specification of the bag directly by means of the worm but also can perform the function of automatic contraction and expansion of the claw arms when the bag is properly located at a specific position so as to cooperate with the external structure for the preformance of expanding the mouth of the bag, charging the bags and the thermal sealing treatment.
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