Brother Kogyo Kabushiki-kaisha

Kenji Matsubara

Fujio Horie

Akihiro Wakayama

Hidetaka Inagaki

Nobusuke Nagasaka

Nobuyuki Naganuma

A lock stitch machine capable of being selectively set for either an overcasting mode or a hemming mode. A needle plate tongue is shifted between an operative position and an inoperative position in a region separated from the operating region of the looper, along a path substantially resembling a circular arc for a vertical displacement and a horizontal displacement greater than the vertical displacement, by turning an overcasting width adjusting knob which turns a control shaft. Thus, the needle plate tongue can be shifted between the operative position and the inoperative position regardless of the position of the looper thereby facilitating the stitching mode changing operation.

Lock stitch machine

When two patterns overlap each other and an over stitch block in one of the two patterns divides an under stitch block in the other pattern, a first correction processing is performed so as to divide the under stitch block into two stitch blocks. Then, a second correction processing is performed as follows. A degree of hardening of the stitch embroidery portion resulting from a tightening of the threads of the embroideries in an overlapped portion between the over and under stitch blocks to a workpiece is first determined according to reference directions of the stitch blocks and positions of intersections of the stitch blocks. Then, the higher the degree of tightening, the more the area of the overlapped portion of the under stitch block near the boundary between the stitch blocks is left, whereas the lower the degree of tightening, the more this area is eliminated. Finally, an embroidery frame moving mechanism is controlled according to the corrected stitch data.

Sewing machine having an embroidery function

For each of a plurality of frame patterns, pattern data of the frame pattern, position data of character patterns and data of a maximum number of character patterns are stored in a memory. When an arbitrary one of the frame patterns and a plurality of arbitrary character patterns are selected, data composition is performed such that the selected character patterns are combined with the frame pattern at a predetermined position on the condition that the number of such character patterns is limited to the maximum number for the selected frame pattern.

Pattern data processing apparatus for sewing machine

In the pattern sewing machine comprising a pattern selector for selecting and combining pattern units such as characters and symbols and a controller for driving a sewing mechanism and a feeding mechanism to form the combination of pattern units selected by the pattern selector, the controller is provided with a diagonal placing unit for placing one pattern unit in a diagonal direction relative to another pattern unit adjacent thereto when the two adjacent pattern units are sewn in series.

Pattern sewing machine

In the sewing machine of this invention, the operator can confirm on the selected-mode display M9 provided in the display M4 that the selected mode is for writing the pattern and whether the selected pattern is for only one use or the selected pattern is to be stored in the nonvolatile storage M7. The pattern selector M2 selects at least two patterns from the pattern-data storage M1. The arrangement of the selected patterns is stored in the pattern storage M3. The stored arrangement of the patterns is stored in the nonvolatile storage M7. Through specified processes, the patterns reader M8 develops the arrangement of the pattern stored in the nonvolatile storage M7 into the pattern storage M3. The controller M6 sequentially reads the arrangement of the patterns developed in the pattern storage M3 and drives the sewing mechanism M5 to form the arrangement of the patterns on fabric. When the pattern to be used repeatedly is thus once entered, the pattern can repeatedly be stitched on fabric.

Sewing machine for stitching selected patterns

A sewing machine includes a timing pulse generator, a thread feeding device, thread sensor, and microcomputer. The timing pulse generator generates a timing pulse when a main shaft is rotated by a predetermined rotational increment by a main motor. The thread feeding device feeds out a needle thread toward a needle. The thread sensor is disposed in a path of the needle thread between the thread feeding device and the needle, and generates a thread breakage signal when the needle thread is out of the path. The microcomputer drives the thread feeding device based on the timing signal generated by the timing pulse generator if the thread breakage signal is not generated by the thread sensor. The microcomputer counts the timing pulses after the thread breakage signal has been generated by the thread sensor. The microcomputer stops the main motor when a count value has reached first predetermined value. The microcomputer stops the thread feeding device when the count value has reached a second predetermined value which is smaller than the first predetermined value.

Sewing machine with automatic thread control and thread breakage

The start and end timing of fabric feed in a sewing machine greatly affects the tightening of needle thread, that is, the sewing quality. Among the electronically controlled zigzag sewing machines, those equipped with feed means directly driven by a pulse motor supplied with command pulses, it has become possible to control freely the start and end timing of fabric feed. Disclosed is a feed control device for an electronically controlled zigzag sewing machine comprising pulse train generating means for generating feed command pulse train in a predetermined pulse train pattern depending on the number of pulses corresponding to the feed stroke of the work fabric and the speed of the main motor, and pulse train generation control means for controlling the start of operation of the pulse train generating means according to the speed of the main motor so that the vertical motion phase of the needle at the end of generation of the command pulse train by the pulse train generating means may be delayed the more as the speed of the main motor is the faster.

Feed control device for an electronically controlled zigzag sewing

A feed device has feed members for feeding a work, and a stepping motor for directly driving the feed members. The period of driving pulses for driving the stepping motor is determined by feed control means on the basis of a speed signal indicating an actual operating speed of the main motor of the sewing machine or on the basis of a selectively set speed. The feed control means controls the stepping motor so that the feed motion of the feed members is continued also after the completion of the thread tightening operation of the take-up lever in order that the needle thread is tightened properly by the feed motion of the feed members.

Growing community of inventors

Aichi, Japan

Kenji Matsubara