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US 4,791,877 AGranted
Feed control device for an electronically controlled zigzag sewing machine
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsFujio Horie, Kenji Matsubara
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AssigneeBrother Kogyo Kabushiki Kaisha
InventorsFujio Horie, Kenji Matsubara
Estimating the term…
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.
A feed control device for an electronically controlled zigzag sewing machine including a needle reciprocated up and down by a main motor with a variable speed, feed means directly driven by a pulse motor for feeding a work fabric in synchronization with the vertical motion of said needle, pulse motor driving means for driving said pulse motor in response to a command pulse train of the number of pulses corresponding to a feed stroke of said work fabric, a thread take-up member driven in synchronization with the vertical motion of said needle in order to take-up the tread loop formed in the eye of the needle, and speed setting means for setting the speed of said main motor;
A feed control device for an electronically controlled zigzag sewing machine including a needle reciprocated up and down by a main motor with a variable speed, feed means directly driven by a pulse motor for feeding a work fabric in synchronization with the vertical motion of said needle, pulse motor driving means for driving said pulse motor in response to a command pulse train of the number of pulses corresponding to a feed stroke of said work fabric, a thread take-up member operating in synchronization with the vertical motion of said needle in order to take-up the thread loop formed in the eye of the needle, speed setting means for setting the speed of said main motor, stitch pattern data generating means storing data directions in each stitch motion for each of multiple stitch patterns, and stitch pattern selecting means for selecting the stitch patterns stored in said stitch pattern data generating means;
Dependencies are inferred from the claim text.