Tokai Kogyo Kabushiki Kaisha

Masashi Yamashita

Sadao Unuma

Kouichi Hara

A clamp is used for clamping a paper feed tractor to a support shaft at a predetermined distance from another paper feed tractor. The clamp comprises a semi-cylindrical elongated clamp guide member which is cantilevered from a frame of the paper feed tractor, and a cylindrical clamp member rotatably mounted about the clamp guide member. The clamp guide member has a clamping inner peripheral surface adapted to complementarily engage the support shaft, a first outer peripheral surface, a second outer peripheral surface having a radius of curvature larger than the first outer peripheral surface and a sloped outer peripheral portion joining the first and second outer peripheral surfaces. The clamp member has a clamping inner peripheral surface adapted to complementarily engage the support shaft, a first inner peripheral surface, a second inner peripheral surface having a radius of curvature larger than the first inner peripheral surface, and a sloped inner peripheral portion joining the first and second inner peripheral surfaces, such that the clamp member is rotatable between a clamping position and a release position.

Clamper of paper feed tractor

In a sheet feed tractor, a lid confines a paper sheet on a frame surface when the paper sheet is conveyed on a belt. The lid is constructed so that it can overrun and return to its normal open position. The lid is constructed so as to include a lid member rotatable between a closed position spaced closely adjacent the surface of the frame so as to confine the paper sheet and an open position spaced away from the surface. The lid member has at one side edge thereof a pair of hinge pins disposed with a space therebetween and projecting over one side of the frame. The frame includes a pair of hinges projecting from one side of the frame and has the hinge pins of the lid member rotatably mounted thereto. The hinges of the frame include grooves opening towards the outside of the sheet feed tractor and are adapted to pivotally receive the hinge pins of the lid member. Upper portions of the hinges with the grooves include a stop member for resting the lid member there against in a first, open position and are resiliently movable when the lid member is rotated past the first, open position to a second position and when returned to the first, open position from the second position.

Lid for sheet feed tractor

A paper feed apparatus for a printer, having a belt type paper feed mechanism and a feed wheel both mounted on a frame. The belt type paper feed mechanism is of a construction in which a driving sprocket and two driven sprockets are arranged so that the respective rotational axes are positioned at the angles of a triangle, and in these positions the three sprockets are rotatably supported by the frame, and an endless belt is entrained about those sprockets. The endless belt has feed pins erected in a row at predetermined intervals on its outer peripheral surface. The feed wheel is supported by the frame rotatably about a rotational axis parallel to that of the driving sprocket in a position close to the same sprocket, and it has feed pins radially erected in a circumferential row at predetermined intervals on its outer peripheral surface. The driving sprocket and the feed wheel are driven synchronously so that the outer peripheral surface speed of the endless belt and that of the feed wheel being equal to each other.

Paper feed apparatus

A paper feeding tractor including a frame formed by a pair of said frames; a driving sprocket rotatably supported between both side frames at a first end portion of the frame; an endless belt adapted to be driven by the driving sprocket; a pair of first supporting rollers located at a second end portion of the frame and arcuate guiding members projecting from the opposite inner surfaces of the side frames at the second end portion for supporting said endless belt in a loop, whereby the endless belt is arcuately supported by the first supporting rollers and the arcuate guiding members; and a second supporting roller rotatably supported between both side frames at a longitudinal position between the driving sprocket and the first supporting rollers to support the inner peripheral surface of the end belt. The arcuate guiding members are designed to support both side edge portions of the inner peripheral surface of the endless belt, while the second supporting roller is designed to support the transversely central portion of the inner peripheral surface of the endless belt.

Growing community of inventors

Aichi, Japan

Masashi Yamashita