Abstract: A workpiece holding member is movably supported by a stationary member secured to the bed of a sewing machine for moving in both the longitudinal and transverse direction and a movable member is connected to the holding member to be linearly and rotatably driven in the longitudinal and transverse directions by pulse motors.

Abstract: A sewing machine is disclosed herein. The sewing machine comprises a looper rockably supported on the frame of the machine below the throat plate for rocking movement in response to the rotation of the machine shaft and having first and second thread holes, a thread transfer mechanism adapted to move the leading end of a looper thread to a position facing the second thread hole after the leading end of the thread has passed through the first thread hole and a threading device adapted to pass the leading end of the looper thread through the second thread hole.

Abstract: An apparatus for setting a zipper and a front cloth to sew in correct position providing a pair of set-plates which perform three dimensional motion: vertical swing to clamp a workpiece and horizontal swing to form a "V" shape to receive a slitted front cloth and forming parallel lines to locate the zipper and the front cloth in the correct position. The motion of the set-plates is driven by air cylinders actuated by a pedal switch.

Abstract: An actuator comprises a piezoelectric element and a mechanical amplifier. Displacement caused by the piezoelectric effect of the piezoelectric element is amplified mechanically by a lever-link system having a lever portion and a fulcrum. The lever-link system comprises multiple steps. The amplified displacement is effectively provided by a transmitting arm for use in a electronic equipment such as printers.

Abstract: An input device for an electronically controlled sewing machine is effective for inputting stitch patterns which are partially prohibited from scaling up or scaling down. A control circuit is signalled that points of a stitching pattern are not to be scaled. A check bit added to the coordinate value of prohibited-scaling stitch points flags the scaling prohibition condition.

Abstract: A stabilizing device containing two bonded elastomeric materials with restitution coefficients that vary inversely with temperature changes. The resultant restitution coefficient of the printer hammer back-stopper remains relatively constant regardless of temperature variations in the back stopper caused by heat generated by the operation of a hammer solenoid.

Abstract: A mechanical amplifier for a piezoelectric actuator employs a lever-link system having a lever and a fulcrum to amplify a displacement caused by the piezoelectric effect of the piezoelectric element. A fulcrum supporting a last amplified lever forms a semi-pivotal construction to strengthen the stiffness of the amplifier. The invention converts electrical energy into mechanical energy for application to a printer or other electronic instruments.

Abstract: A printer paper feeding apparatus providing cams at the central portion of a paper release lever around a platen shaft. A first cam is adapted to release paper bail rollers by rotation of the paper release lever. A second cam is adapted to contact and release presser rollers against a platen by rotation of the paper release lever.

Abstract: The invention relates to a method of controlling an upper thread in a sewing machine. The sewing machine includes a needle holding the upper thread and vertically movable in association with a spindle, a loop taker holding a bobbin case carrier having a lower thread and rotatable in association with the spindle for forming a lock stitch in cooperation with the needle, and a thread take-up lever vertically movable in association with the spindle for loosening or taking up the upper thread. For a period of time from a moment at which a loop of the upper thread is released from a loop taker to a moment at which stitch tightening is completed, a tension required for stitch tightening is rendered to the upper thread.

Abstract: A lifting and lowering mechanism for an ink ribbon and a correction tape of a typewriter includes a stepper motor which drives both a ribbon lift arm and a tape lift arm. First and second gear wheels, partially geared at predetermined portions and pivoted along the stepper motor shaft, engage with a gear wheel equipped at the ribbon lift arm and the tape lift arm respectively. The ink ribbon and the correction tape are lifted separately and selectively by changing the direction of the stepper motor rotation.

Abstract: A thread cutting mechanism for a lock stitch sewing machine which comprises a stationary blade, a reciprocally movable blade, operation means for moving the movable blade reciprocally and adjusting means for adjusting the reciprocal movement distance of the movable blade so as to vary the operative position with the initial position maintained constant. The movable blade includes a thread handling portion, a thread cutting knife portion, a thread arresting portion and a thread guide portion.

Abstract: This invention relates to a device for controlling the rotation of the stepping motor in a printer. The device comprises a U-shaped frame member fixedly secured to the carriage of the printer and having opposing light emitting and receiving elements formed by the opposing legs of the frame member and a detector fitted on the drive shaft of the stepping motor for rotation with the drive shaft so as to intervene between the light emitting and receiving elements to interrupt the passage of the light from the light emitting element to the light receiving element to thereby turn the light receiving element OFF and also clear the light emitting and receiving elements to allow the light to pass from the light emitting element to the light receiving element so as to turn the light receiving element ON as the detector rotates.

Abstract: A drive control mechanism and a safety device in a sewing machine in which thread in a predetermined amount necessary for the formation of one seam each time a seam is to be formed. The drive control mechanism comprises a control circuit for allowing current to flow to a machine motor when no thread amount signal is produced though a position signal is produced at the start of the machine. The safety device comprises a thread paying-out detection circuit operable when a position signal is produced, but no thread amount signal is produced, an alarm for producing a sound or light warning in response to the operation of the thread paying-out detection circuit and a motor stop circuit for interrupting flow of current to a machine motor.

Abstract: A thread tightening control apparatus according to the present invention is capable of tightening upper and under threads accurately and in good order, irrespective of fabric thickness, by the relative movement between a needle and a fabric holding body.The apparatus is provided with setting means capable of generating a plurality of setting signals of different timings at which the drive pulses are to be supplied to the drive means in dependence upon fabric thickness. Shifting means is operable in association with a selected setting signal for moving a period during which drive means is supplied with drive pulses by the actuating means forward or backward with respect to a predetermined rotational angle of a spindle. As a result, the distance between the tip of the needle and the surface of the fabric at the completion of fabric feed is set to a predetermined minimum length irrespective of fabric thickness.

Abstract: This invention relates to a device for mounting a printing type array on a printer. The mounting device comprises a pin supported on the casing of a printing type array for moving into and out of a hole in the printing type array under and against resilient force, respectively, a pressure member secured to the machine framework for urging the pin into the hole in the printing type array, a motor movably supported on a carriage and having a rotary shaft including a flange and a latch pin normally subjected to resilient force to protrude from one face of the flange and retract from the one face of the flange against resilient force and resilient retainer means on the motor rotary shaft and printing type array for preventing the printing type array from moving in the axial direction of the shaft as the motor moves to the operative position and for allowing the printing type array to rotate together with the shaft as the shaft rotates.