Abstract: In a sewing machine having an automatic thread cutting mechanism, a situation of a thread cutting operation is detected in power-OFF to continuously carry out a proper operation when a power supply is turned ON again after sudden power-OFF. In a sewing machine having an automatic thread cutting mechanism, there is provided means for detecting an operation situation of the automatic thread cutting mechanism when a power supply is turned ON. Based on a signal for the detection, the automatic thread cutting mechanism is operated to complete a thread cutting operation and to carry out a control to return into an initial state when a stop is performed with the thread cutting mechanism in power-ON executing the thread cutting work.

Abstract: Disclosed is an automatic thread cutting device for a sewing machine which is provided with a horizontal loop taker, wherein a thread catching member (4) is operated in response to a thread cutting instruction to reciprocatingly move with a movable blade (5) along a predetermined course, the thread catching member (4) normally catching the upper thread when moving in the return-way of reciprocation to guide the upper thread to a fixed blade (14) which is provided to cut the upper thread in cooperation with the movable blade (5), and wherein a thread regulating means is provided to cut the lower thread (29d) together with the upper thread, the thread regulating means being operated to press down the lower thread (29d) to a position where the lower thread (29d) is caught by the thread catching member (4) in addition to the upper thread when the thread catching member (4) is moving in the return-way of reciprocation.

Abstract: Disclosed is an automatic thread cutting device for a sewing machine which is provided with a horizontal loop taker, wherein a thread catching member 4 is operated in response to a thread cutting instruction to reciprocatingly move with a movable blade 5 along a predetermined course, the thread catching member 4 normally catching the upper thread when moving in the return-way of reciprocation to guide the upper thread to a fixed blade 14 which is provided to cut the upper thread in cooperation with the movable blade 5, and wherein a thread regulating means is provided to cut the lower thread 29d together with the upper thread, the thread regulating means being operated to press down the lower thread 29d to a position where the lower thread 29d is caught by the thread catching member 4 in addition to the upper thread when the thread catching member 4 is moving in the return-way of reciprocation.

Abstract: In a sewing machine having an automatic thread cutting mechanism, a situation of a thread cutting operation is detected in power-OFF to continuously carry out a proper operation when a power supply is turned ON again after sudden power-OFF. In a sewing machine having an automatic thread cutting mechanism, there is provided means for detecting an operation situation of the automatic thread cutting mechanism when a power supply is turned ON. Based on a signal for the detection, the automatic thread cutting mechanism is operated to complete a thread cutting operation and to carry out a control to return into an initial state when a stop is performed with the thread cutting mechanism in power-ON executing the thread cutting work.

Abstract: An automatic embroidering machine comprising a control apparatus which compares a limit line of movement of an embroidering frame to be used prior to starting embrodeiry with a range of a row of selected and stored embroidering letter, nullifies improper operation keys, and indicates by figures appropriate operations of the operation keys.

Abstract: An embroidery frame attached to an embroidering machine is shifted on a horizontal plane by means of a pair of pulse motors for changing relative position between a vertically reciprocating needle and a fabric supported within the embroidery frame. A phase sensor is arranged for continuously detecting a rotational phase of an upper drive shaft which governs a vertical position of the needle. The pulse motors are controlled such that a horizontal shift of the embroidery frame is prevented or discontinued in a particular circumstance for preventing breakage of the needle and/or damage of the fabric which would otherwise occur during the frame shift operation.

Abstract: An automatic embroidering machine comprising a stitch forming unit including a vertically reciprocating needle, an embroidering frame for supporting a fabric to be stitched, a drive for effecting X-Y movement of the embroidering frame in accordance with vertical reciprocal movement of the needle, a first control unit for coordinating codes for embroidering patterns of the same color in sequence by comparing color changing codes included in embroidering data, and a second control unit for moving the embroidering frame to a coordinate with a color changing code of a different color to form patterns of different colors.

Abstract: An embroidering machine is provided with a display section which is retractable within a machine housing and can be pulled to an operational position when in use for select/input operation. Several kinds of select/input operation can be made with a single display means, by suitably changing and selecting the display mode. Select/input operation is made by plotting an appropriate portion seen in the display, reducing to a great extent erroneous operation with a visual support.

Abstract: An embroidering system comprises a plurality of embroidering machine each connectable to a single control unit. Various characters or patterns are stored in a floppy disc installed in the contol unit, from which pattern data designating a desired pattern combination can be read out and transferred to a memory in the control unit responsive to key entry operation. By repeated key entry operation, plural series of stitch control data including the pattern data are in a lump stored in the memory. Among them, a specific series of the stitch control data can be read out in response to a pattern renewal signal which is generated by manual depression of a corresponding key arranged on the embroidering machine each time when the preceding embroidering operation has been completed.

Abstract: An embroidering machine includes RAM which stores temporally the embroidering data read out from a memory card; a device which detects attaching or detaching of the memory card; a buffer circuit which makes and breaks a power source and buses for the memory card; an indicator or warning device which indicates the circuit making and breaking; a device for double checking the data sent from the memory card to RAM; and a device which indicates to the operator the presence of a required card. In the detector of the memory card, determined detecting edge terminals of the memory card are made shorter, and when the card is detached the circuits of the detecting terminals are disconnected earlier than the remaining circuits.

Abstract: A delay circuit is realized by a program, instead of a conventional one of a hard system, so that if a pedal controller is rapidly stepped, a suitable speed acceleration or reduction curve may be always provided and the delay circuit is not affected by changes in temperatures or variations in passing time.

Abstract: A flat touch switch having plural switch components with rotation speeds of the sewing machine shaft indicated on each component is positioned in the region of the needle bar. Pushing a component part of the switch drives the machine at the indicated speed. A control logic circuit senses the pushed component and by sensing the speed of the driven shaft, drives the machine at the selected speed.

Abstract: A device for regulating upper thread tension in a sewing machine having an upper thread tension device with two discs receiving an upper thread therebetween, a spring pressing the discs one against the other, a presser body positioned between the spring and the discs, and a manually operated dial for actuating the presser body, the regulating device having an indicator for indicating a thread tension of a proper value and operatively connectable to the dial and movable thereby, in which a relation between a moving amount of the presser body and a moving amount of the indicator is regulated and a pressure of the thread tension is adjusted to the movement of the thread tension indicator.

Abstract: A safety control device for a speed control circuit of a commutator motor having an ignition circuit includes a circuit for detecting an armature current and defining whether the commutator motor is energized with a supply current or with a free wheel current, a maintaining circuit for discriminating if the detected result is a continuously energized condition or an intermittent condition, and a bistable circuit. The maintaining circuit smoothes the detected voltage of the energized motor and maintains the voltage over at least one cycle of the power source and functions temporarily in an equivalent manner of continuous energization of the motor when power source is applied to the motor.

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: A sewing machine has a group of pattern cams arranged to cooperate with a needle to produce a pattern per cycle rotation thereof, a user-operated pattern selecting device arranged to be manipulated for selecting the pattern cams to control a lateral swinging movement of the needle, a machine stopping device, pattern cycle selecting device operated to select one of pattern cycles to automatically stop the sewing machine after a selected pattern has been formed up in a selected pattern cycle, a device for detecting a termination of a pattern cycle and producing an electrical signal each time it detects the termination of the pattern cycle, a counter device responding to a predetermined number of the electrical signals of the pattern cycle detecting device to produce a pulse signal, and machine stopping device responding to the pulse signal of the counter device to operate the machine stopping device to stop the sewing machine.

Abstract: A cycle stitching device for a sewing machine includes a switch automatically operated to deenergize the drive motor of the machine and simultaneously energize a solenoid for activating a stopping device that stops the sewing machine with the needle located at a predetermined position, and pattern cam means stopped at a predetermined position thus permitting the stitching of the subsequent pattern exactly from the initial stitch coordinate.

Abstract: A braking and speed-control circuit is disclosed which prevents excessive current from being dissipated in a DC series motor. The circuit includes two free-wheeling diodes, a forward-biased diode, and a thyristor. The forward-biased diode is placed between the field coil and the armature winding of the motor. One free-wheeling diode is placed across the entire motor circuit, including the forward-biased diode. The other free-wheeling diode is placed across the forward-biased diode and the field coil. The thyristor can short across the forward-biased diode and the armature winding.