Abstract: This invention relates to an automatic sewing machine exclusively used for sewing a zipper on a workpiece and its related art. The automatic sewing machine exclusively used for sewing a zipper on a workpiece comprises a sewing machine (10, 20) capable of at least sewing linearly, a drive device movable in two axes right angles to each other in a plane vertical to the movement direction of the needle (11, 21) of the sewing machine and a zipper setting device (12, 22) attached to said drive device for gripping said zipper (3) and workpiece (1) in a predetermined relationship.

Abstract: This invention relates to an automatic sewing machine exclusively used for sewing a zipper on a workpiece and its related art. The automatic sewing machine exclusively used for sewing a zipper on a workpiece comprises a sewing machine (10, 20) capable of at least sewing linearly, a drive device movable in two axes right angles to each other in a plane vertical to the movement direction of the needle (11, 21) of the sewing machine and a zipper setting device (12, 22) attached to said drive device for gripping said zipper (33) and workpiece (1) in a predetermined relationship.

Abstract: A paper feeding device for a printer provides presser rollers which are located on a normal line drawn from center of a platen to a tangential line drawn from circumference of a sprocket wheel to a platen circumference. Thus, papers are stiffened and stable paper feeding is maintained.

Abstract: The disclosed method and apparatus for setting a workpiece correctly on a skirt-zipper sewing machine provides a pair of pressing plates which are positioned at the center of a zipper when the plates are lowered and which press the material of the workpiece and the zipper to be sewed to it.Each pressing plate works as a guide to set the to-be-sewn section of the workpiece at the center line of the zipper. The plates are then raised and again lowered to press the workpiece so that shrink marks that occur in bias curved sections of the workpiece are stretched. In this manner, a zipper is sewed to the workpice without shrink marks.

Abstract: A printer which is so constructed as to automatically detect deviation of a printing type when a deviation detecting command signal is detected and to automatically adjust paper feed immediately after a pause mode is released.

Abstract: An apparatus for terminating the last stitch at a predetermined point including two workpiece-end detectors, one working to reduce the stitching speed and the other working to terminate the last stitch at the predetermined point with reduced speed. Where the number of stitches (D) to be conducted at the reduced speed exceeds number of stitches (R) necessary to reduce the speed, stitching without reducing speed continues and the number of stitches is operated as (D-R), and then the speed is reduced. Thus, stitching speed is increased. The above processes are automatically conducted through a CPU (Central Processing Unit) by input of the necessary data, namely, the original stitch pitch (P), the margin distance (a), the number of stitches (R) necessary to reduce speed, etc.

Abstract: A piezo-electric actuator magnifies piezoelectric displacement through two-steps, provided by a first lever portion and a second lever portion which are connected by two plate springs. One of the plate springs transmits a tension force while the other plate spring located adjacent to the first plate spring works as a fulcrum. A higher magnifying power of displacement is obtained.

Abstract: This invention relates to an automatic sewing machine exclusively used for sewing a zipper on a workpiece and its related art. The automatic sewing machine exclusively used for sewing a zipper on a workpiece comprises a sewing machine (10,20) capable of at least sewing linearly, a drive device movable in two axes right angles to each other in a plane vertical to the movement direction of the needle (11, 21) of the sewing machine and a zipper setting device (12, 22) attached to said drive device for gripping said zipper (3) and workpiece (1) in a predetermined relationship.

Abstract: A workpiece detector for a sewing machine including a rotatable detecting lever in which small angular displacements at the end of the detecting lever, caused by differences in workpiece thickness, are multiplied mechanically causing the rotation of an electrical converter. Detectable output signals are generated such that overlapping of workpieces or the end of a workpiece may be detected during stitching. The length of the detecting lever is adjustable such that the detecting point may be varied.

Abstract: This invention relates to an automatic sewing machine exclusively used for sewing a zipper on a workpiece and its related art. The automatic sewing machine exclusively used for sewing a zipper on a workpiece comprises a sewing machine (10, 20) capable of at least sewing linearly, a drive device movable in two axes right angles to each other in a plane vertical to the movement direction of the needle (11, 21) of the sewing machine and a zipper setting device (12, 22) attached to said drive device for gripping said zipper (3) and workpiece (1) in a predetermined relationship.

Abstract: A piston driving device for dispensing a predetermined small amount of paste-like material from a nozzle in response to an electrical signal without any time-delay is enabled by the slow rotation of a ball-screw shaft, the rotation being reduced by a differential gear system. A female ball-nut fitted onto the ball-screw shaft causes a piston plunger to advance at very low speed such that dispensing of the predetermined volume of paste-like fluid is possible. Vertical motion of a nozzle is compensated by vertical motion of a piston driving device such that the relative position of a piston against a nozzle is unchanged.

Abstract: The disclosed method and apparatus for setting a workpiece correctly on a skirt-zipper sewing machine provides a pair of pressing plates which are positioned at the center of a zipper when the plates are lowered and which press the material of the workpiece and the zipper to be sewed to it.Each pressing plate works as a guide to set the to-be-sewn section of the workpiece at the center line of the zipper. The plates are then rasied and again lowered to press the workpiece so that shrink marks that occur in bias curved sections of the workpiece are stretched. In this manner, a zipper is sewed to the workpiece without shrink marks.

Abstract: A shirring control apparatus automatically reads sewing data from a pattern or the like, automatically calculates the sewing data from the read data or the data previously read from the pattern, distributes the amount of shirring for each of the desired areas of a circle of the sleeve from the calculated sewing data, controls the distributed amount of shirring for each stitch, changes the amount of shirring differentially dependent upon the quality of the cloth and the bias, and displays the differential movement.

Abstract: A needle plate for a device adapted to sew a sequence of idle chain stitches has a guide contiguous to a needle locating opening, which guide is adapted to guide the sequence of idle chain stitches so as to pass through the needle location when the free end of the sequence is grasped by a retainer. With such arrangement, the idle chain stitches are sewn by a sewing thread at least at a position where sewing of a cloth starts and are maintained generally inwardly of a hemstitch seam.

Abstract: A thread chain is prevented from hanging at an inner chain-off finger when it is turned back or rotated to the operator's side for holding and cutting. A needle thread, positioned at the front side of a lower looper, is guided by a needle thread restricting device, and a needle thread positioned on the back side of a lower looper is prevented from being hung on an inner chain-off finger by a thread chain guiding device provided at a throat plate so that enfolding back and tacking of the thread chain into the fabric material is performed well.