Hydromechanical plastic web indexing system for synthetic plastics thermoforming machinery
First Claim
1. In an indexing system for synthetic plastics molding machines including plastic web gripping drive elements movable in a planar path of travel and employed to feed a plastic web to the molds of said machine in indexing movements separated by periods of dwell;
- a motor system incorporating a motor and a drive transmission mechanism connected between the motor and drive elements for moving said drive elements;
a braking device incorporated in the motor system for instantaneously braking the mechanism and drive elements to locate the latter in precise position;
means for disabling the motor system to cease transmission of drive force to said drive elements; and
a drive decelerating device connected with the motor system for slowing the drive imparted to said drive elements;
the improvement comprising;
a movable indexing stroke measuring device driven by the drive transmission mechanism in a path of movement corresponding with the indexing movement of said web gripping drive elements; and
first and second control parts positioned to be engaged thereby, the movable stroke measuring device having first engagement near the end of the indexing movement with a part enabling the decelerating device and second engagement with a part connected to enable said braking device and said means for disabling the motor system.
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Accused Products
Abstract
An indexing system for synthetic plastics molding machinery, wherein plastic web gripping drive elements are employed to feed a plastic web in planar indexing movements to the molds of the machine, utilizes a conventional pump driven hydraulic motor connected with the web gripping drive elements by drive transmission mechanism incorporating a brake for positively halting the web gripping elements in predetermined position. A stroke measuring control device driven by the drive transmission mechanism in a path of movement corresponding with the indexing moving of the web gripping elements first decelerates the movement of the web gripping elements and then positively halts them in a predetermined position. Alternatively, a photoelectric eye sensitive to the position of the web can stop the web.
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Citations
9 Claims
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1. In an indexing system for synthetic plastics molding machines including plastic web gripping drive elements movable in a planar path of travel and employed to feed a plastic web to the molds of said machine in indexing movements separated by periods of dwell;
- a motor system incorporating a motor and a drive transmission mechanism connected between the motor and drive elements for moving said drive elements;
a braking device incorporated in the motor system for instantaneously braking the mechanism and drive elements to locate the latter in precise position;
means for disabling the motor system to cease transmission of drive force to said drive elements; and
a drive decelerating device connected with the motor system for slowing the drive imparted to said drive elements;
the improvement comprising;
a movable indexing stroke measuring device driven by the drive transmission mechanism in a path of movement corresponding with the indexing movement of said web gripping drive elements; and
first and second control parts positioned to be engaged thereby, the movable stroke measuring device having first engagement near the end of the indexing movement with a part enabling the decelerating device and second engagement with a part connected to enable said braking device and said means for disabling the motor system. - View Dependent Claims (2, 3, 4, 5)
- a motor system incorporating a motor and a drive transmission mechanism connected between the motor and drive elements for moving said drive elements;
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6. In an indexing system for synthetic plastics molding machines including plastic web gripping drive elements movable in a planar path of travel and employed to feed a plastic web to the molds of said machine in indexing movements separated by periods of dwell;
- a motor system incorporating a motor and a drive transmission mechanism connected between the motor and drive elements for moving said driving elements;
a braking device incorporated in the motor system for instantaneously braking the mechanism and drive elements to locate the latter in precise position;
means for disabling the motor system to cease transmission of drive force to said drive elements; and
a drive decelerating device connected with the motor system for slowing the drive imparted to said drive elements;
the improvement comprising a movable indexing stroke measuring device driven by the drive transmission mechanism in a path of movement corresponding with the indexing movement of said web gripping drive elements; and
a first control part connected to said drive decelerating device, positioned to be engaged thereby, the movable stroke measuring device having engagement near the end of the indexing movement with said part to enable the decelerating device and there being a second control part actuated thereafter which is connected to enable said braking device and said means for disabling the motor system. - View Dependent Claims (7, 8, 9)
- a motor system incorporating a motor and a drive transmission mechanism connected between the motor and drive elements for moving said driving elements;
Specification