Abstract:
A sewing machine having a motor drive operating in response to a controller to rotate in forward and reverse rotation directions. A jogging angle may be set and the drive operated automatically for rotation in forward and/or reverse directions as a function of various operating conditions so that the needle is stopped in an optimum position for piercing a material.
Abstract:
A control unit for an electric drive motor of industrial processing machinery includes a control arrangement which drives a pair of magnets generating a magnetic flux and a Hall effect sensor disposed between the magnets so as to be swept by the magnetic flux rotatively with respect to each other; the Hall effect sensor outputs an electric signal which varies consistently with the position setting of the control arrangement and drives the electric motor accordingly; the movement of the control arrangement is resisted by springs having different degrees of stiffness from one another; proper interaction can thus be established between the operator and the machine.
Abstract:
A drive device for a sewing machine which varies the speed of the auxiliary motor. In a sewing machine drive device, the rotation of a clutch motor is transmitted through a pulley and an endless belt to the spindle of the sewing machine. The rotation of an auxiliary motor is transmitted through a driving sprocket, a timing belt and a driven sprocket and through the pulley to the spindle of the sewing machine. The drive device includes rotation varying means which varies the rotation of the auxiliary motor in response to the variation in diameter of the driving pulley of the clutch motor.
Abstract:
A sewing machine drive apparatus having a first and second rectifying circuit connected to an AC power source, and a sewing machine control circuit for outputting a drive signal and for outputting a voltage control signal after a certain time period has elapsed from outputting said drive signal. A motor drive circuit is connected to the first rectifying circuit for driving a motor. A DC/DC converter solenoid power source circuit is connected to the second rectifying circuit for outputting a rated voltage of a solenoid, and for outputting a hold voltage to hold the solenoid in response to a voltage control signal. A solenoid drive circuit inputs the output of the DC/DC converter solenoid power circuit in response to a drive signal to drive the solenoid.
Abstract:
A sewing machine rotates a motor in reverse direction through a predetermined angle for giving an impetus to a needle to penetrate a thick and heavy cloth when a time period from starting of sewing to a completion of a first stitch is longer than a predetermined time period.
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 speed control device comprising: memory means for storing speed data representing the sewing speeds suitable for various types of sewing machines, sewing-machine-type selecting means for selecting a desired one of the various types of sewing machines and providing a sewing-machine-type selection signal for the selected type of sewing machine, data selecting means for reading the speed data of the selected type of sewing machine from the memory means in response to the sewing-machine-type selection signal, and speed control means for controlling the sewing speed of the selected sewing machine according to the speed data outputted by the data selecting means.
Abstract:
A sewing machine controller in which initially a rotation transfer ratio is calculated from the number of rotations of a motor and the detected number of rotations of the sewing machine shaft. Thereafter, the number of motor rotations is calculated as the product of the rotation transfer ratio and the desired number of rotations of the sewing machine.
Abstract:
A sewing machine housing includes a base to hold the machine's drive mechanism and a covering mounted on the base. To effect an easy alteration of the outer shape, the covering comprises a plurality of individual covering pieces with edge contours aligned with one another, the individual covering pieces being detachably connected to the base or to one another. In order to adapt to differently designed operating means in a given area of the base to be covered, a plurality of individual covering pieces are provided for that area with a plurality of different shapes with essentially the same edge contours and edge design.
Abstract:
A detector for detecting the angular position of the main shaft of a sewing machine and the indicator apparatus of a sewing machine are utilized to output the RPM of the main shaft to the indicator apparatus. The detector detects the cycle time of the main shaft rotation by referencing a clock signal and comparing it with preset data. Thereby, the RPM of the main shaft is determined.