Abstract: In an apparatus for detecting and displaying a residual quantity of lower or under thread (12) of a sewing machine, an under-thread bobbin (10) is provided with transparent flange portions (10a) permitting the light rays emitted from a light emitting device of a photosensor (19) to pass through the flange portions (10a ) of the bobbin (10). The light rays having passed through the bobbin (10) are then reflected by a reflecting means or mirror (21) affixed to a back surface of a bed of the sewing machine to impinge on a light receiving device of the photosensor (19) so that the photosensor (19) detects the residual quantity of the lower thread (12) of the sewing machine. In the photosensor (19), the light emitting device is integrally formed with the light receiving device to save space.

Abstract: A multifunction switching control system includes: a sewing speed controller of a computerized sewing machine controlled in response to a voltage of a sliding terminal of a variable resistor incorporated in the controller; an invariable resistor; a first A/D converter for converting the voltage from an analog signal to a first digital signal; and a second A/D converter for converting a voltage at a fixed terminal of the variable resistor from an analog signal to a second digital signal. A switch circuit for directly connecting one terminal of the invariable resistor to the fixed terminal of the variable resistor is provided in the controller. By comparing the second digital signal with a preset value, it is determined whether or not the switch circuit is so operated. In case that the switch circuit is so operated, sewing operation other than sewing speed controls of the machine are conducted.

Abstract: A sewing machine capable of setting a feed pitch of a first stitch on zero in a work piece at the beginning of sewing operation, comprises: a needle reciprocable in a vertical direction and joggable in a lateral direction; a feed means which cooperates with a presser foot in operation in synchronism with the needle for feeding a work piece at a desired rate; a stitch-forming mechanism driven by a main drive motor of the sewing machine; a motor-operation detecting means for detecting operating conditions of the main drive motor; a needle-position detecting means for detecting a position of the needle having been disposed above a throat plate; and a presser-foot position detecting means for detecting a position of the presser foot relative to the throat plate, whereby a feed pitch of the feed means is set on zero at a time when the motor-operation detecting means detects a stopping condition of the main drive motor, so that a condition in which the feed pitch of the feed means is set on zero is held until a sub

Abstract: A sewing machine having a wireless controller is disclosed, wherein the sewing machine substantially comprising a drive motor for driving the sewing machine, a separate controller adjustably operated to produce a variable set voltage for controlling the rotation speed of the drive motor, a converter for converting the set voltage to a corresponding digital value and producing a series of data on the basis of the digital value, a device for producing carrier waves, modulator for modulating the series of data by way of the carrier waves and producing modulated waves, transmitter means responsive to the modulated waves to produce a corresponding light signal, means for receiving the light signal, demodulator for demodulating the received light signal, and a device responsive to the demodulated light to control the rotation speed of said drive motor.

Abstract: A zigzag sewing machine includes a needle hole member having a round needle hole of a diameter slightly larger than that of a stitching needle. The needle hole member engages a laterally elongated hole in a needle plate and is swingable along the latter. A base member is mounted coaxially with a loop taker and is rotatable relative to the loop taker. The needle hole member is pivoted to the base member for relative vertically swinging movement. A lever swingably mounted on the machine housing engages with the needle hole member, and a cam rotated in synchronism with the vertical reciprocation of the needle is in engagement with the swinging lever. A stepping motor is operatively connected to the needle to reciprocate the needle laterally in the elongated needle plate hole, and the motor is also operatively connected to the base member to reciprocate the base member.

Abstract: An apparatus of a sewing machine for indicating elongated pattern length is disclosed, wherein memory means normally stores a number of pattern data for forming the stitches of different patterns with a standard stitch amplitude and a standard fabric feed pitch, pattern selection means is selectively operated to select a desired pattern from the pattern data storing memory, amplitude setting means is optionally operated to set the amplitude value of the selected pattern, indication means indicates an amplitude value of the selected pattern set by the amplitude setting means, pattern elongation setting means is optionally operated to set a pattern elongating magnification value, discrimination means judges whether the selected pattern is elongatable or not, and means is provided for displaying the pattern elongating magnification value in the indicating means.

Abstract: A selected pattern display device of a sewing machine is disclosed wherein pattern selecting means is selectively operated to select stitch data for a pattern from a plurality of patterns including a straight stitch pattern stored in pattern storage means, amplitude selecting means is selectively operated to select a numeral value for determining the amplitude of the selected pattern, and display means is provided to display the selected pattern and the numeral value of the selected pattern, discriminating means is responsive to operation of the pattern selecting means to discriminate if the selected pattern is the straight stitch pattern, the discriminating means producing a signal, if the selected pattern is the straight stitch pattern, straight display data storage means is responsive to the signal from the straight stitch pattern discriminating means and a numeral value selected by operation of the amplitude selecting means to produce graphic data representing the straight stitch pattern of a determined n

Abstract: A color display apparatus adapted to be used in an electronic sewing machine. The apparatus consists of a sewing pattern selector, a color display for displaying the pattern selected by the selector, a fabric color sensing system, an upper thread color sensing system, and a display color controller. Fabric color information, upper thread color information, and pattern information are inputted to the display color controller. The controller operates the color display. An operator monitors the matching condition of the color of the fabric and upper thread in order to obtain the desirable matching of them in the pattern selected by means of the display color controller.