Janome Sewing Machine Company Limited

Toshihide Kakinuma

Hideaki Takenoya

Hachiro Makabe

Kazuo Watanabe

Toshiaki Kume

Tosiaki Kume

Kume Toshiaki

In electronic pattern stitch sewing machine lock stitches are produced prior to the initial and final stitch of a selected pattern without deforming the patterns. In this machine, under single setting operation conditions the setting of desired sewing parameters is made automatically for a basting operation.

Electronic sewing machine

An electronic sewing machine with an electronic memory and electronic circuit for controlling the needle amplitute and the fabric feed in order to form a plurality of stitching patterns includes a plurality of pattern-selecting buttons on the pattern panel of the machine, an inverse memorizing button for inversing a pattern selected by the pattern selecting buttons, a memorizing button which causes the electronic memory to store a plurality of patterns in cooperation with the pattern selecting buttons, a function selector for dropping feed dog means with respect to the needle plate in cooperation with the pattern selecting buttons, and a twin-needle button for reducing the needle lateral amplitude.

The needle-shifting zig-zag unit and the work feeding unit are moved to different positions, when necessary, for successive stitches, to form a stitching pattern. Each unit is powered by the main rotating drive shaft of the sewing machine. However, each unit is provided with a respective stepper motor. Each stepper motor changes the setting of an adjuster in a reciprocating-motion generator driven by the main drive shaft. When one of these adjusters is in a constant setting, its respective reciprocating-motion generator continually generates reciprocating motion of constant corresponding amplitude, for an unlimited time, so long as the drive shaft rotates. The needle-penetration coordinates for the stitching pattern are established by continually changing the amplitude of the reciprocations performed by the two reciprocating-motion generators. A static memory is read out, in synchronism with sewing, to furnish information commanding the stepper motors to move the amplitude adjusters of the reciprocating-motion generators from one amplitude setting to another, very quickly, to in this way establish all the successive needle-penetration coordinates for even complex stitching patterns.

Electrical automatic pattern stitching sewing machine

A first memory stores stitch control signals. A second memory stores these signals temporarily and reads them out to enable stitches to be formed. As a pattern is stitched, the first memory is readdressed and stitch control signals are successively written into and read out of the second memory. In one embodiment, the second memory is a RAM--in a second embodiment, the second memory is a shift register. Monostable multivibrators are used to operate the memories.

Electronic control system for sewing machines

A pulse motor rotation phase adjusting system for a sewing machine includes a pulse motor operative for positioning a needle of the sewing machine in accordance with the predetermined stitch coordinates of a selected pattern. The pulse motor is adapted to be set to one of the stepping rotation phases in dependence upon the predetermined combinations of the magnetic forces generated by the windings of the pulse motor. A light interrupting arrangement is provided in the system which is connected to the output shaft of the pulse motor and serves for detecting the respective rotation phases of the pulse motor within a range of the maximum needle swinging amplitude and to produce a signal corresponding to predetermined combination of the magnetic forces, which signal is read out by a control circuit operatively connected to the pulse motor to rotate and reset the same to its initial position in accordance with said predetermined stitch coordinates when the electric power is applied to the sewing machine.

Pulse motor rotation phase adjusting system of a sewing machine

The electronic patterning system of a sewing machine comprises a main pattern memory consisting of a large number of individually addressable storage locations. Instead of each storage location storing only the stitch-control data for one stitch of one pattern, one section of each of at least some of the storage locations stores stitch-control data pertaining to one stitch of one pattern but with another section of the same storage location storing stitch-control data pertaining to a different stitch, e.g., a stitch of a completely different pattern. Thus, it may be that for some stored patterns one section of each storage location used for a pattern stores needle-bar position commands with the other section of each such storage location storing cloth-feed commands. However, if the cloth-feed commands would anyway be identical, one after the next, for each stitch of the pattern, the second sections of these storage locations are not wasted on storage of this invariant cloth-feed command data, but instead are used, for example, for storing needle-bar position commands of an entirely different pattern, with the invariant cloth-feed command data being applied to the cloth-feeding unit of the machine not from the pattern memory but instead from an auxiliary memory which responds to selection of this pattern by applying the requisite unvarying cloth-feed command data for such pattern to the cloth-feeding unit of the machine.

Sewing machine with electronic patterning system

The stitch-control-signal outputs of a first memory are connected to the inputs of stitch-forming instrumentalities via an intermediate second memory. One of the two memories is a static memory which is read out by applying to the address signal inputs thereof a series of next-address signals derived from the signals produced at the output of that memory. Both memories may be static memories whose read-out is performed in that way. Alternatively, the intermediate memory may be a sequential-access dynamic memory, such as a shift register, whose read-out is effected by a train of indistinguishable shift signals. In the latter event, the read-out of the first memory is effected by applying to the address-signal inputs thereof a series of next-address signals derived from the output signals of the first memory and not performed in synchronism with machine operation, whereas the read-out of the dynamic sequential-access second memory is performed in synchronism with machine operation but without addressing codes and instead by trains of indistinguishable signals. The information read out from the intermediate second memory is written into it either from the first memory or alternatively from an external pattern data reader, such as a perforated-tape reader.

Sewing machine with stitch-pattern control circuitry

Patterned stitching is produced by shifting the needle or work feed of the machine to different position coordinates. A motion-generating cam generates motion in a first path of motion. A transmission lever receives this motion and transmits it to the stitch forming instrumentalities. Positioning members move in synchronism with main shaft rotation in a second path of motion which is parallel to the first, and in doing so passes through different position-coordinate settings. Locking levers are activatable and releasable by solenoids for locking the positioning members in selected position-coordinate settings. A pattern-selecting unit operates in synchronism with main shaft rotation and selects the position-coordinate settings in which the positioning members are to be locked, and causes the locking levers to lock them in such settings.

Sewing machine with a pattern generating device

A drive motor drives a reciprocating sewing needle. A static memory has lateral-control-signal outputs at which it furnishes signals indicating how much the needle should be laterally shifted for each stitch in a selected pattern, and feed-control-signal outputs at which it furnishes signals indicating how much a work feeding device should feed the work for each stitch of the pattern. An addressing circuit response to a pattern selector applies to the static memory a repeated sequence of address signals, causing the memory to produce repeated sequences of lateral-control and feed-control signals at its outputs. The first address signal in any of the repeated sequences of address signals causes the static memory to produce at its output a first lateral-control signal constituting a maximum-speed-establishment signal, and a first feed-control signal constituting a maximum-permissible-speed signal. A latch receives the feed-control signals but does not in general register them, except when activated. A detector receives the lateral-control signals, and in response to the maximum-speed-establishment signal activates the latch which then registers the maximum-permissible-speed signal. A motor speed limiter limits the speed of the drive motor in dependence upon the signal registered by the latch.

Pattern stitching speed control system for electronic sewing machines

An arrangement for forming patterns made up of stitches includes a memory, a stitch-forming apparatus, an addressing device and a synchronizing device. The memory has a plurality of outputs and a plurality of address signal inputs and is comprised of a plurality of storage units connected to the inputs and outputs and addressable by address signals applied to the address signal inputs of the memory. The stitch-forming apparatus has a plurality of stitch control signal inputs connected to outputs of the memory and operative for producing any of a plurality of different stitches in dependence upon the signals produced at the outputs of the memory. The addressing device is operative when activated for applying to the address signal inputs of the memory next-address signals derived from the signals produced at the outputs of the memory itself. The synchronizing device activates the addressing device repeatedly and in synchronism with the operation of the switch-forming apparatus.

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Tokyo, Japan

Toshihide Kakinuma