Sewing machine and sewing system
A sewing machine in which a base configured to support a throat plate, a shuttle or a looper, and an input shaft for a stitching operation to the shuttle or the looper with respect to a bed portion of a frame is supported to be movable along a direction of approaching or separating from a sewing needle is provided. The sewing machine includes a connecting member which changes to any one of a state in which the input shaft and a transmission shaft are aligned in the same straight line to be in a torque transmission state and a state in which the input shaft moves together with the base with respect to the transmission shaft, between the input shaft on the base side and the transmission shaft which transmits power to the input shaft.
1. A sewing machine in which a base configured to support a throat plate, a shuttle or a looper, and an input shaft for a stitching operation to the shuttle or the looper, with respect to a bed portion of a frame is supported to be movable along a direction of approaching or separating from a sewing needle, the sewing machine comprising:
a connecting member configured to change between a first state in which the input shaft and a transmission shaft are aligned in the same straight line to transmit torque and a second state in which the input shaft moves together with the base out of alignment with the transmission shaft, between the input shaft on the base side and the transmission shaft which transmits power to the input shaft,
wherein the connecting member includes a first joint member provided on the input shaft side and a second joint member provided on the transmission shaft side,
the connecting member is connected by a key formed on any one of surfaces of the first joint member and the second joint member facing each other, and a key groove formed on the other surface, and
the key and the key groove are formed along a direction orthogonal to the input shaft and the transmission shaft.
2. The sewing machine according to claim 1 , wherein the connecting member is an Oldham's coupling or a Schmidt coupling,
wherein the Oldham's coupling comprises the first joint member, a relay member, and the second joint member, and
wherein the Schmidt coupling comprises the first joint member, a relay member, the second joint member, and two or more link members.
3. The sewing machine according to claim 1 , further comprising:
a lifting and lowering mechanism which moves the base along a direction of approaching and separating from the sewing needle,
the lifting and lowering mechanism includes:
a cam follower,
a cam main section formed with a cam section which relatively moves the cam follower in a moving direction of the base, and
a driving source which causes the cam main section or the cam follower to reciprocate in a predetermined direction intersecting with the moving direction of the base.
4. The sewing machine according to claim 3 , wherein the cam section of the cam main section has a changing section which causes displacement in the moving direction of the base along with the reciprocating movement of the cam main section or the cam follower by the driving source, and
a non-changing section is provided at one end of the changing section so as not to cause displacement in a direction in which the base is spaced apart from a position where the base has most moved to the sewing needle side.
5. A sewing system comprising:
the sewing machine according to claim 1 ; and
a robot arm which holds the sewing machine at a tip portion of the arm.
6. The sewing system according to claim 5 , wherein a needle bar side end portion of an arm portion of the sewing machine is supported by the robot arm.