Pegasus Sewing Machine Mfg. Co., Ltd.

Pegasus Sewing Maching Mfg. Co., Ltd.

Pagasus Sewing Machine Mfg. Co., Ltd.

Minoru Nakano

Toru Yamazaki

Eiji Yasuda

Takashi Kasuda

Kazuo Noguchi

Shozo Hikiguchi

Takayuki Matsunami

Yukihiro Nishimura

In a looper thread control device for a double chainstitch sewing machine, the sewing needles are lowered securely into a thread triangle, even under the conditions of low thread tension and high speed operation, and with an elastic looper thread, without rib formation or skipped stitches in the fabric. A looper thread support member 1 moves up and down in cooperation with sewing needles NL, NR near the left end of the looper L. The looper thread support member 1 enters into the triangle prior to the descent of the sewing needles, and seizes the looper thread LT. The looper thread support member 1 holds the looper thread until the eyelet LE on the looper moves to the right side of the looper thread support member 1, thereby pulling out the looper thread LT from the thread source, and then releases the looper thread.

Looper thread control method and device for a double chainstitch sewing

An apparatus and a method for supplying thread in a chain stitch sewing machine are disclosed, the apparatus comprising a needle vertically reciprocating between a top end point and a bottom end point in one sewing cycle; a looper horizontally reciprocating in one sewing cycle; a thread supply device for forcibly supplying a needle thread to the needle; and a thread supply control device for controlling the thread supply device so that the needle thread is supplied in at least two periods in each sewing cycle, the periods being discontinuous.

Apparatus and method for thread supplying in a chain stitch sewing

A sewing apparatus displays a stitch pattern and forcibly supplies a thread based on the displayed stitch pattern. The apparatus comprises a sewing mechanism, an automatic thread supply device, a key input unit, a memory, a selector and a display. The sewing mechanism has a sewing section which includes a needle and a looper driven in accordance with a rotation of a main shaft. The automatic thread supply device forcibly carries a needle thread and a looper thread to the sewing section. The key input unit sets lengths per stitch of the needle thread and the looper thread which are to be supplied by the automatic thread supply device to the sewing section. The memory stores a plurality of stitch patterns in correspondence with combinations of the lengths of the threads to be supplied per stitch. The selector selects one of the stitch patterns corresponding to the combination set by the key input unit. The display displays in graphics the stitch pattern selected by the selector.

Sewing apparatus equipped with an automatic thread supply device

In a thread supply device used in a sewing apparatus having a plurality of needles and a looper mechanism, needle threads guided to the needles and a looper thread guided to the looper are cut by a thread cutting unit at a cutting position, which is off a thread supply path, after a sewing operation is finished but before the following sewing operation starts. The thread supply device comprises a supply mechanism, a stopping mechanism, a memory and a control unit. The supply mechanism forcibly supplies the needle threads and the looper thread. The stopping mechanism stops the threads from being supplied. The memory stores an extra length of each thread, which is required for a cutting operation. The control unit reads out the extra length from the memory and controls the supply mechanism and the stopping mechanism so that each thread is supplied in the extra length.

Thread supply device used in a sewing apparatus with a plurality of

An automatic thread supply device for a conventional overlocking sewing machine is disclosed. Each of a needle thread, an upper looper thread and a lower looper thread is supplied to a thread supply roller but the supply is stopped for an optimum period by a thread holder, whereby the supply length of each thread is adjusted. In forming a thread chain, the total supply length of the looper threads is not more than five times of the length of the needle thread, and the smallest length of the above threads is not more than half of the total length of the remaining threads. In this way, a highly expandable thread chain is formed having a good appearance.

Thread chain formed by an overlocking sewing machine and a method for

A needle thread feed regulating device utilized in high speed overedge sewing machines which form safety stitches composed of overedge stitches and double chain stiches. The needle thread feed regulating device comprises a thread guide mounted on the sewing machine frame and an oscillating thread guide which moves in cooperation with the sewing machine main shaft. The oscillating thread guide has a cam plate which regulates the feed of both the thread for overedge stitches and the thread for double chain stitches.

Needle thread feed regulating device for overseaming sewing machine

An automatic thread supply device for a conventional overlocking sewing machine is disclosed. Each of a needle thread, an upper looper thread and a lower looper thread is supplied to a thread supply roller but the supply is stopped for an optimum period by a thread holder, whereby the supply length of each thread is adjusted. In forming a thread chain, the total supply length of the looper threads is not more than five times of the length of the needle thread, and the smallest length of the above threads is not ore than half of the total length of the remaining threads. In this way, a highly expandable thread chain is formed having a good appearance.

Automatic thread supply device

In a needle plate used in a sewing machine for forming double chain stitches, a recess is formed at a looper heel side of a needle hole behind a needle drop point. During the sewing of a fabric, the loop of the looper thread expands by tensioning of the needle thread and settles within the recess, so that balloon stitches are formed on the under side of the fabric.

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Osaka, Japan

Minoru Nakano