Patent ID: 8826837

Claim:
A sewing frame actuator for a sewing machine which actuates a sewing frame which is a square frame for stretching processed fabric to be sewn with a sewing machine and that comprises a pair of long sides and a pair of short sides, the actuator comprising: a sewing frame actuation block for actuating the sewing frame in a front-back direction and a right-left direction which includes: first front-back direction actuation blocks which actuate the sewing frame in a front-back direction; second front-back direction actuation blocks which actuate the sewing frame in a front-back direction; and right-left direction actuation blocks which actuate the sewing frame in the right-left direction, wherein each of the first front-back direction actuation blocks includes a first movable member that comprises an engagement member to engage one long side of the sewing frame and that is placed so as to be movable in the front-back direction, a second movable member that comprises an engagement member to engage a remaining long side and that is placed so as to be movable in the front-back direction, and a first actuation block that moves the first movable member and the second movable member in the front-back direction; each of the second front-back direction actuation blocks is laid along the pair of short sides of the sewing frame, and includes a third movable member that is connected to the short side or a longitudinal end of one long side of the sewing frame by a connection member, a fourth movable member that is connected to the short side or a longitudinal end of a remaining long side of the sewing frame by a connection member and that is spaced apart from the third movable member, a second actuation block that move the third movable member and the fourth movable member in the front-back direction, and a support that supports the second actuation block and also supports the third movable member and the fourth movable member so as to be movable in the front-back direction; and each of the right-left direction actuation blocks is provided in correspondence with each of the pair of short sides of the sewing frame, and includes a fifth movable member that is provided so as to be movable in a right-left direction and to hold the support, and a third actuation block that actuates the fifth movable member in the right-left direction; and wherein the first actuation block and the second actuation block are controlled synchronously by a control circuit in such a way that the first movable member and the second movable member move in an identical direction; and that the third movable member and the fourth movable member move in the same direction where the first movable member moves, and wherein the third actuation block on one short side of the sewing frame and the third actuation block on the other short side of the sewing frame are controlled synchronously by the control circuit in such a way that the fifth movable member on the one short side and the fifth movable member on the other short side move in an identical direction.