Patent ID: 8931404
Filing Date: 2015-01-13
Classification: B65B

Abstract:
1. A feeding and reversing mechanism for a strapping machine, comprising: an installation wall provided with a pivot thereon; a forward-reverse wheel assembly mounted on the installation wall and including an active wheel and a passive wheel adjacent to the active wheel for feeding and reversing a strapping band passing between the active wheel and the passive wheel; a tension wheel assembly including a tension active wheel mounted on the installation wall and a tension passive wheel adjacent to the tension active wheel; a first arm including spaced first and second ends, with the first end of the first arm pivotable about an axis defined by the pivot, with the tension passive wheel mounted on the second end of the first arm, wherein the tension passive wheel is movable relative to the tension active wheel and is biased away from the tension active wheel; a cam; a second arm including spaced first and second ends, with the first end of the second arm pivotable about the axis defined by the pivot, with a rotary member mounted to the second end of the second arm and being in contact with the cam, with the first and second arms resiliently connected together; a first spring unit including a first spring and a fixing piece, with the fixing piece extending through the first spring and the installation wall and fixed relative to the first arm, with the first spring sandwiched by the fixing piece and the first arm, with the first spring unit biasing the tension passive wheel away from the tension active wheel; and a second spring unit including a second spring and a fastener, with the fastener extending through the second spring and the first arm and fixed relative to the second arm, with the second spring sandwiched by the fastener and the first arm, with the second spring unit resiliently connecting the first and second arms together; wherein a gap is provided between the tension passive wheel and the tension active wheel for the strapping band to pass through; wherein the second arm is pivoted by the rotary member to move the tension passive wheel on the first arm toward the tension active wheel to clamp the strapping band securely when the cam rotates; and wherein the forward-reverse wheel assembly is mounted on the installation wall independent of the first and second arms.