Abstract: A method for automatically stitching by a zigzag sewing machine a button hole, which includes two line-tack stitching parts stitched sequentially, comprises applying a predetermined amount of fabric feeding to a first group of alternate stitches in both line-tack stitching parts, and then applying no fabric feeding to a second group of alternate stitches in the line-tack stitching parts by not moving the fabric relative to the needle in any direction. Inclined stitches and non-inclined stitches which alternate with each other result in each line-tack stitching part.

Abstract: An electronic sewing machine is disclosed in which a first memory stores a plurality of patterns, a second memory temporarily memorizes pattern numbers each specific to the patterns, a first switch and address pointing means enable the second memory to memorize a series of selected pattern numbers, and a second switch resets the address pointing means. The address pointing means also advances the address of the second memory such that a display indicates the pattern numbers one after the other in the desired order.

Abstract: When a sewing machine is stopped, it is electrically indicated whether a needle is positioned at a range where the thread passing is available so that intermittent indication during stitching operation is not made. The sewing machine is provided with a device including a neon lamp and a light interrupting member. The sewing machine has on its exposed front surface lighting indicators which are illuminated by the light of the neon lamp if this light is transmitted by the interrupting member which is mounted on or in the vicinity of the movable device for vertical movement of the needle so that the indicators indicate in the inoperative position of the sewing machine that the thread may be passed in a thread passing device.

Abstract: In an electronic sewing machine, a pattern data memory has memory locations which are accessed in such a manner that address signals are prepared at random. These random address signals are used as stitch data to produce a specific version of a selected pattern.

Abstract: An electronic sewing machine has a memory storing stitch control data for a number of different patterns which may be selected by designation of pattern numbers each specific to the patterns, a second memory for temporarily storing the pattern numbers as they are selected, and a display for electrically indicating the selected pattern numbers in the order as they have been stored in the second memory, maintaining a precededly displayed pattern number until the subsequent one is selected, wherein the ten-keys may be selectively operated to select any of the patterns stored in the first memory, the ten-keys indicating at least two specific ten-keys to be operated to provide at least two different two-figure numbers for changing the function of at least two function keys originally having specific functions respectively into the function for confirming at the display the selected pattern numbers in series in the order and the reverse order as they have been selected respectively, and a signal discriminating circ

Abstract: An electronic sewing machine is provided with an electronic memory and electronic circuit capable of producing auto-data for controlling the needle lateral amplitude and the fabric feed to thereby form respective stitch patterns of an automatically controlled size, and manual signals acting on the auto-data for manually adjusting the needle lateral amplitude and the fabric feed in response to operation of adjusting dials arranged on a front panel of the machine. The manual signals can be produced separately for adjusting the needle lateral amplitude and the fabric feed independently from each other to thereby stitch a deformed configuration of the stitch pattern, but the machine is so designed that the needle lateral amplitude and the fabric feed are simultaneously adjusted by one and the same manual signal in response to operation of one of the adjusting dials for proportionally enlarging or reducing the automatically controlled size of the stitch pattern with its configuration being unchanged.

Abstract: An electronically controlled sewing machine includes an electronic memory storing a plurality of stitch control data for respective stitch patterns, including a darning pattern composed of a number of vertical straight stitch lines sequentially produced in forward and reverse fabric feeding directions. A number of signals which are generated each time a fabric penetrating needle ascends above the fabric between the first stitch and the last stitch of each vertical straight stitch line of the darning pattern, are counted up by a counter to produce a corresponding value signal. The latter signal is compared with another value signal latched in a latch circuit in response to operation of a turning point designating switch adapted to designate a number of stitches for each vertical straight stitch line of the darning pattern. When the value signals coincide with each other, the count-up operation of the counter is reset for producing a subsequent vertical straight stitch line.

Abstract: In an 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.

Abstract: A stitch pattern sewing machine utilizes a microcomputer which operates in a stitch control mode and in a malfunction diagnosing mode. Each mode is selectively rendered effective by a changeover switch. The diagnosis of malfunction includes a series of checking steps carried out in a predetermined order. Indication means are selectively illuminated to operate in either one of the two modes in dependence upon the position of the changeover switch.

Abstract: A sewing machine with an electronic memory stores stitch control signals which are sequentially read out in synchronism with rotation of the upper drive shaft to control at least one of the needle swinging amplitude and the feeding amount or both. Pattern selecting switches are operated to select a pattern of stitches, each stitch being produced by the needle swinging amplitude and feeding amount predetermined by a selected set of stitch control signals of the memory. Manually influenced stitch adjusting means vary either the needle swinging amplitude or feeding amount for fine adjustment of the selected pattern.

Abstract: The invention is to provide an electronic sewing machine which is improved in operation by incorporating lighting indication and vocal instrumentalities for making the operation instruction recognizable during operation of the sewing machine and giving parameters of operating instruction in accordance with issued voice, instead of depending upon electronic memories which store many kinds of patterns for lighting indication of required function.

Abstract: A speed-control circuit for a motor of the sewing machine is disclosed. The circuit includes a controller, thyristors for controlling the rotation of the motor in dependence upon the operation of the controller, operational amplifiers activated in dependence upon the operation of the controller to produce a speed designating voltage, a frequency - voltage converter which receives a frequency representing the speed of rotation of the main shaft of the sewing machine, a comparator for comparing that speed designating voltage with the voltage of the frequency-voltage converter to detect a motor drive phase, and a light emitting diode and a phototransistor activated by the motor drive phase and operative for controlling the ignition phase of those thyristors.

Abstract: In a stitch control process of the sewing machine which employs a microcomputer with an electronic memory storing stitch control signals and a needle position control motor and a fabric feed control motor, the microcomputer controls the needle position and the fabric feed control motors at certain rotation phases of the sewing machine. The microcomputer temporarily holds, during the operation of the sewing machine, the needle and feed control data and the feed control amount based on the feed control data which are read out in each phase and calculates the addition of the feed control amount and the needle control amount based on the needle control data which is read out at the following phase.

Abstract: A sewing machine has a rotatable shaft for operating a stitch forming device, and includes a feed dog for feeding fabric to be sewn, and a needle for forming stitches in the fabric.

Abstract: A driving system for a pulse motor, particularly of a sewing machine, includes an electronic memory for determining the time series of drive pulses to control the speed of the pulse motor according to a number of moving steps. The system is provided with a number of calculating devices operated in accordance with calculating formulas reflecting the functions of the number of stepping pulses to control the stepping speed of the pulse motor in accordance with the number of steps needed by the pulse motor to move a given distance.

Abstract: Disclosed is an electronic sewing machine for modifying a stitch pattern with stitch forming instrumentalities, including a first memory for storing stitch control data used to control said stitch forming instrumentalities, a plurality of pattern selecting switches selectively operable for producing a different pattern signal for addressing the first memory to sequentially read the stitch control data, a second memory for storing a selected number of pattern signals, each one of the selected number of pattern signals designating an initial address of the first memory, a counter for counting the total and ordinal number of the pattern signals stored in the second memory, and a calculating device for storing at least one calculation formula for selecting a predetermined variation rate, the calculating device being responsive to the total as well as ordinal numbers of the pattern signals to modify the stitch control data read from the first memory for controlling the stitch forming instrumentalities.

Abstract: 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.

Abstract: An electronically controlled sewing machine to produce stitches and to change the relative position between the needle and the fabric to be sewn. The sewing machine comprises a first memory (ROM1) storing pattern data including the data for producing straight stitches, pattern selecting means selectively operated to select a set of pattern data of such data stored in the first memory and a second memory (ROM2) storing automatic setting information each specific to the selected pattern and controlling commonly the stitches of the selected pattern. An operator control means adjusts the control of the automatic setting information with respect to the stitches of the selected pattern and a calculating means receives the output of at least one of the second memory (ROM2) and the operator controlled means (VR1, VR2) to calculate the stitch coordinate to each of the stitches of the selected pattern.

Abstract: A plurality of different stitch patterns are stored in a first static memory. A second static memory memorizes a combination of these different patterns in a predetermined sequence. A third static memory stores basic needle position signals each specific to the patterns stored in the first memory. Calculating means utilize signals derived from the second memory and the third memory to determine values for adjusting the swinging amplitude of the sewing needle with a common variation rate and for setting a common basic needle position.

Abstract: This invention relates to an electronic sewing machine with which stitch patterns can be formed according to stitch control signals stored in electronic memory means, and more particularly to stitch pattern control means for such an electronic sewing machine.