Sewing – Stitch forming – Revolving-hook type
Reexamination Certificate
2003-02-20
2004-06-08
Izaguirre, Ismael (Department: 3765)
Sewing
Stitch forming
Revolving-hook type
C112S231000
Reexamination Certificate
active
06745712
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a full rotary hook which is disposed in a domestic sewing machine, an industrial sewing machine or the like.
BACKGROUND ART
A typical horizontal full rotary hook of the conventional art has a loop taker which is rotated about a rotation axis perpendicular to the axis of a movement path of a needle that is vertically reciprocated; an bobbin case holder which is attached to the inside of the loop taker; a bobbin case which is detachably attached to the inside of the bobbin case holder; and a bobbin around which a bobbin thread is wound and which is then attached to the inside of the bobbin case.
The loop taker has a peripheral wall having a loop seizing beak for seizing a needle thread passed through a needle, and a track groove formed in an inner peripheral portion thereof; a bottom wall connected to one axial end portion of the peripheral wall so as to be perpendicular thereto; and a boss which is integrally formed with the bottom wall so as to be protruded from the bottom wall toward the side opposite to the peripheral wall and is fixed to the lower axis of a sewing machine with being positioned in the circumferential direction. In order to avoid interference with the inserted needle, a notch is formed in the peripheral wall of the loop taker to divide the loop taker in the circumferential direction. The loop seizing beak is formed in one circumferential end portion which is an end portion on the downstream side in the rotation direction of the loop taker.
The bobbin case holder has a peripheral wall having a track projection formed on the outer periphery thereof; a bottom connected to one axial end of the peripheral wall so as to be perpendicular thereto; a flange connected continuously projected in the radial direction outwardly from the other axial end of the peripheral wall; and a stud standing from the center of the bottom to the open end of the inner bobbin case so as to be perpendicular to the bottom. In order to enable the thread passing which will be described later, the track projection is divided along the circumferential direction in the region where the needle is to be inserted. A holder stop recess is formed in the flange. The bobbin case holder is attached to the loop taker under a state where the bottom is placed on the loop taker bottom wall side. The track projection is fitted into the track groove of the loop taker, and the bobbin case holder is rotatably supported with respect to the loop taker. A projection of a holder stop member fixed to the body of the sewing machine is fitted into the holder stop recess, thereby preventing the bobbin case holder from being rotated in accordance with the rotation of the loop taker, in the same direction.
The bobbin case has a peripheral wall on which a bobbin thread tension spring is disposed, and an end wall perpendicularly which is perpendicularly continuous from one axial end of the peripheral wall, and in which a latch mechanism is disposed. Under a state where the bobbin around which the bobbin thread is wound is accommodated, the bobbin case is engagingly attached to the stud of the bobbin case holder by the latch mechanism. The bobbin thread accommodated in the bobbin case is pulled out from the bobbin, passed between the peripheral wall of the bobbin case and the bobbin thread tension spring, and then guided to the upper side through the open end of the bobbin case holder.
The horizontal full rotary hook is configured in the following manner. The loop taker is rotated about the rotation axis, the needle thread supplied by the needle which is reciprocated in synchronization with the rotation of the loop taker is seized by the loop seizing beak, and a loop of the needle thread is passed over the periphery while being expanded along the outer face of the bobbin case holder, thereby performing the thread passing so as to cause the bobbin case holder to pass through the loop of the needle thread. The needle thread is wound around the bobbin thread pulled out from the bobbin. Under this state, the needle thread is pulled up due to an upward motion of a thread take-up lever (not shown), whereby sewing a workpiece on a throat plate is allowed.
Another typical conventional art is an oscillating loop taker which has: a shuttle race body which is fixed to the body of a sewing machine; a shuttle body which is attached to the inside of the shuttle race body; a driver which is swung about a rotation axis perpendicular to the axis of a needle that is vertically reciprocated; a bobbin case which is detachably attached to the inside of the shuttle body; and a bobbin around which a bobbin thread is wound and which is then attached to the inside of the bobbin case.
In the shuttle race body, a track groove which elongates in the circumferential direction is formed in an inner peripheral portion. The shuttle body has: a peripheral wall which elongates along a semi-arc; a bottom wall which is continuous from one axial end portion of the peripheral wall; and a stud which protrudes from the bottom wall toward the other axial end of the peripheral wall. A track projection is fitted into the track groove of the shuttle race body, and the shuttle body is rotatably supported with respect to the shuttle race body.
The driver has the driver body which elongates along a semi-arc, and a boss which is formed integrally with the driver body, and which is fixed to a lower shaft of the sewing machine with being positioned in the circumferential direction. The driver is configured so that the driver body is placed at a position which is shifted by about 180 deg. with respect to the shuttle body in the shuttle race body, and the circumferential ends of the driver body can press the circumferential ends of the peripheral wall of the shuttle body, respectively.
The bobbin case has a peripheral wall on which a bobbin thread tension spring is disposed, and an end wall which is perpendicularly continuous from one axial end of the peripheral wall, and in which a latch mechanism is disposed. Under a state where the bobbin around which the bobbin thread is wound is accommodated, the bobbin case is engaged with the stud of the shuttle body by the latch mechanism so as to be rotatably attached to the shuttle body. The bobbin case is prevented by the shuttle race body from being rotated in accordance with the rotation of the shuttle body. The needle thread accommodated in the bobbin case is pulled out from the bobbin, passed between the peripheral wall of the bobbin case and the bobbin thread tension spring, and then guided to the upper side through the other end side in the axial direction of the shuttle body.
The oscillating loop taker is configured in the following manner. The driver is swung so as to make a half rotation around the rotation axis. The shuttle body is pressed by the driver to be swung between a position where a loop seizing beak is placed upwardly, and that where the loop seizing beak is placed downwardly. The needle thread supplied by the needle which is reciprocated in synchronization with the swing operation of the shuttle body is seized by the loop seizing beak, and a loop of the needle thread is passed over the periphery of the shuttle body while being expanded along the outer face of the shuttle body, thereby causing the loop of the needle thread to be passed over the periphery of the bobbin case to perform the thread passing. The needle thread is wound around the bobbin thread pulled out from the bobbin. Under this state, the needle thread is pulled up due to an upward motion of a thread take-up lever (not shown), whereby sewing a workpiece on a throat plate is allowed.
In the horizontal full rotary hook of the conventional art, the loop of the needle thread is passed over the bobbin case holder by the loop taker on which the loop seizing beak is formed, in such a manner that the loop is passed over the periphery of the bobbin case holder to which the bobbin case is attached. The loop taker for seizing the needle thread and moving the loop of the needle thread is fixed to the lower sh
Fujinaga Naoji
Hoshina Nozomi
Nishizawa Yoshifumi
Shimizu Hiromitsu
Tsukuda Zengo
Izaguirre Ismael
Mitsubishi Denki & Kabushiki Kaisha
Wenderoth , Lind & Ponack, L.L.P.
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