Method and apparatus for high speed plastic strapping welding
First Claim
1. The method comprising:
- placing a first portion of plastic in contact with a second portion of plastic;
turning a motor shaft in a first direction which releases a lock and allows an upper link to pivot, so that another side of the upper link pushes down on a vertical link, pushing down a gripper that engages with an upper strap under a force of a main spring, such that when the first portion of plastic is in contact with the gripper, the first portion of plastic is between the gripper and the second portion of plastic;
as a result of turning the motor shaft in the first direction, the motor shaft engaging an eccentric shaft in a first configuration in which a rotating axis of the eccentric shaft is coaxial with an eccentric axis of an eccentric bushing creating a non-eccentric neutral position of the eccentric bushing; and
the non-eccentric neutral position of the eccentric bushing causing a vertical link to be engaged with the eccentric bushing in a non-oscillatory neutral position of the vertical link, causing the gripper to exert a force, resulting from the main spring, on the first portion of plastic, holding the first portion of plastic in place on the second portion of plastic aligned in a neutral position.
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Accused Products
Abstract
An apparatus for producing an improved friction-fused welded joint is provided for use with overlapping thermoplastic strap portions. In an embodiment, the gripper is caused to swing back and force with a sufficiently large stroke and with a sufficiently fast stroke to cause sufficient reciprocation to rapidly heat the thermoplastic so that the two straps are welded together while reducing the depth of the area that is melted compared to traditional methods. Also, in an embodiment, a method is provided for stopping the relative motion of the two portions of straps with the portions of the plastic straps oriented in the same aligned relative positions at the end of the welding operation as at the beginning is disclosed.
9 Citations
4 Claims
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1. The method comprising:
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placing a first portion of plastic in contact with a second portion of plastic; turning a motor shaft in a first direction which releases a lock and allows an upper link to pivot, so that another side of the upper link pushes down on a vertical link, pushing down a gripper that engages with an upper strap under a force of a main spring, such that when the first portion of plastic is in contact with the gripper, the first portion of plastic is between the gripper and the second portion of plastic; as a result of turning the motor shaft in the first direction, the motor shaft engaging an eccentric shaft in a first configuration in which a rotating axis of the eccentric shaft is coaxial with an eccentric axis of an eccentric bushing creating a non-eccentric neutral position of the eccentric bushing; and the non-eccentric neutral position of the eccentric bushing causing a vertical link to be engaged with the eccentric bushing in a non-oscillatory neutral position of the vertical link, causing the gripper to exert a force, resulting from the main spring, on the first portion of plastic, holding the first portion of plastic in place on the second portion of plastic aligned in a neutral position. - View Dependent Claims (2, 3, 4)
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Specification