Flexible drive shaft device with high torsional stiffness and low axial strain stiffness, recording medium actuation system, diaphragm and drive shaft for flexible joints

摘要

There is provided a flexible drive shaft device having a high torsional stiffness and a low axial strain stiffness for driving a magnetic tape cassette, the flexible drive shaft device comprising: a drive shaft having an end located opposite to the flexible shaft device; Of a flexible diaphragm. An apparatus is connected to one of the end of the drive shaft and one of the flexible diaphragms and is also connected to the motor to transmit a torsional force from the motor to the drive shaft via the flexible diaphragm. Another device is coupled to the other end of the drive shaft, another flexible diaphragm, and the tape cassette coupling device to transfer torsional forces from the drive shaft to the tape cassette coupling device via the flexible diaphragm. As the center of the diaphragm moves in the axial direction with respect to the outer drive point, the torsional rigidity of the diaphragm rapidly deteriorates, and since the diaphragm is too sensitive to vary the thrust load, To transmit a thrust load applied along the axis of rotation of the drive. According to this structure, the composition device can easily align misalignment between the magnetic tape cassette and the driving device, and can reliably transmit the rotational force.