Tension sensing mechanism for strapping tool

Details Tension sensing mechanism for strapping tool Tension sensing mechanism for strapping tool

1979-10-10

1981-08-11

Lazarus, Richard B.

Wireworking

Applying wire

Binder tightening and joining implements

1401235, B21F 902, B21F 4500

Patent

active

042829070

ABSTRACT:
A strapping tool for tensioning a loop of strap having first and second strap portions about an article is provided with a tension sensing mechanism which includes a gripper member for gripping the second strap portion and restraining it from movement during tensioning of the loop. A first arm is pivotally mounted to the tool frame for pivoting movement in a first direction and in a second, opposite direction. A first spring biases the first arm in the first direction. A second arm is pivotally mounted on the first arm for pivoting movement in the first and second directions away from and towards the strap portions, respectively. A second biasing spring is provided for biasing the second arm in the second direction. A tensioning wheel is mounted on the second arm for being pivoted with the second arm to engage the first strap portion and for being operated to tension the loop when the second strap portion is restrained by the gripper whereby, at a predetermined tension level, the loop tension reaction force transmitted from the second arm to the first arm urges the first arm to overcome the first spring and pivot relative to the frame in the second direction. A control means is provided for responding to the pivoting movement of the first arm in the second direction for terminating the operation of the tensioning wheel at the predetermined loop tension level.

REFERENCES:
patent: 3198218 (1965-08-01), Ericsson et al.
patent: 3506041 (1970-04-01), Angarola
patent: 3863684 (1975-02-01), Simmons
patent: 4015643 (1977-04-01), Cheung

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