Abstract: A sewing machine with a display for displaying basic patterns to be sewn and parameters associated with these patterns. The display is switchable between formats representing different sets of basic patterns and is switchable to a plurality of sequential formats, where each of the sequential formats only displays necessary sequential information for one of the basic patterns and parameters. The display includes a symbol adjacent each of the basic patterns and parameters and the same set of symbols is displayed in each display format. A key board includes a plurality of individual keys which correspond to the symbols on the display. A microprocessor reads the key board to determine which keys have been activated and then changes the display to show the next sequential format when the key corresponding to the symbol adjacent one of the basic patterns and parameters is activated.

Abstract: Digitizing device for manually determining position data of a line drawn on a worksheet. The digitizing device is provided with a base plate for receiving a worksheet containing a line, a cross carriage consisting of a carriage and a slider with a final control element, transmission members between the cross carriage and a position element that determines the position of the final control element in relation to signal recorders, as well as a releasing member that can be actuated manually to send the position data determined by the signal recorders to a circuit.

Abstract: A device for regulating the RPM of an electromotor with an RPM generator coupled to it for generating pulses, measures the intervals between the pulses of a measure of the RPM of the motor. The device includes an oscillator for generating clock signals, which are transmittable to a counter, which counts the number of clock signals between successive pulses of the oscillator, a register, which accepts the counter indication and a device for generating a control value for correcting the RPM of the electromotor over a digital-to-analog converter connected in series to the motor. To generate the control value for regulating the RPM, and RC network containing a manually adjustable control resistance is provided, the capacitor of which can be short-circuited by a switch, which can be activated by an oscillator-driven contact mechanism. The capacitor is additionally connected to a circuit element for switching on the counter, whose switching off can be activated by the oscillator-driven contact mechanism.

Abstract: A pulse generator for a sewing machine drive, having a shaft revolving synchronously with the main shaft of the sewing machine. The pulse generator shaft is connected with two support elements which carry a strobe disk provided with control segments of bright and dark zones, the strobe disk extends between pairs of light emitting and light receiving components. The strobe disk includes a first partial disk non-rotationally connected with one support element and a second partial disk arranged adjacent and non-rotationally connected with the other support element, the angle regions of the mutually correlated bright and dark zones of the control segments of the two partial disks differing from each other, one support element being rotatable relative to the other support element, so as to change the bright and dark zones of the strobe disk.

Abstract: A sewing machine has an electronic control for the production of at least one stitch pattern consisting of a plurality of different single stitches, with a read-and-write memory RAM for storing in memory at least the single stitches of the stitch pattern and with a feed mechanism whose feed adjustment occurs by a step motor controlled in accordance with the stored data of the read-and-write memory within the inactive phase of the feed mechanism. To carry out a feed variation exceeding the maximum number of steps of the step motor between two predetermined sewing stitches, the control unit contains a comparator which compares the magnitude of the displacement amount of the step motor before the next displacing movement is carried out with a given maximum displacement amount, in order to prevent a stitch formation between the point of insertion of the previous stitch and the desired point of insertion of the next following stitch when the maximum displacement amount is exceded.

Abstract: In a sewing machine with a microcomputer controlled step motor for the control of the magnitude and direction of the feeding action of a cloth feeder, the microcomputer is connected, via a buffer and a D/A converter, to the non-inverting input of a comparator which controls the turn-on and turn-off as well as the current intensity of each phase winding of the step motor and whose inverting input is connected to a discriminating element disposed in the phase circuit, for the step setting correction and for the torque intensification of the step motor. To adapt the correction possibilities to the step motor parameters, the D/A converter has four input stages whose biggest stage is connected to the corresponding output stage of the buffer via a voltage divider.

Abstract: A sewing machine with spooling equipment. For a spooling operation, an armshaft of the sewing machine can be disconnected from a motor drive of the machine. Through a pulse generator for delivering pulses, the armshaft is coupled to a circuit for controlling the speed of the sewing motor. The circuit comprises an operational amplifier designed with a feedback network. To permit an automatic switching of the operational amplifier to regulation or control sewing and spooling, the feedback network of the operational amplifier comprises two resistance members connected in parallel, of which one can be disconnected by a switch which is controlled by the pulse generator. To simplify the switching, the switch is designed as an analog switch whose control line is connected to the output of a control circuit having one end connected to a starter resistor to which the operational amplifier is responsive, and its other input connected to the pulse generator.

Abstract: In a sewing machine with a universal motor, a speed control for the motor, a lamp, and a plug connection on the sewing machine housing for connecting the power supply and speed control lines to the motor and to the lamp, for equivalent replacement of the normal impedance starter by one with integrated phase angle control, a phase angle control is provided as a speed controller which comprises a rectifier bridge consisting of diodes for current supply to the phase angle control and to the lamp, as well as a rectifier bridge with semiconductor devices controlled by the phase angle control, for the control of the motor.

Abstract: A circuit is disclosed for controlling the speed of a motor having a constant magnetic field and supplied from an alternating current line source through a controllable semiconductor rectifier which utilizes a pair of series connected electronic switches each followed by storage capacitors. The switches are operated in phase opposition by the line frequency and followed by the input of a controller whose output is connected to a firing stage for firing the semiconductor rectifier.

Abstract: A pulse generator of variable-speed drives, particularly sewing machine drives having a main rotatable shaft and a housing comprising a casing defining an inner space connected to the sewing machine housing, a generator shaft rotatable and synchronous with the main shaft and mounted for rotation in the casing, a pulse disc with light-dark zones connected to the shaft and rotatable within the inner space of the casing, a light transmitting module and a light receiving module connected to the casing, the casing including bearing surfaces on either side of the disc bearing against and bearing surfaces of the shaft for supporting the pulse disc for rotation. Bearing surfaces provide a seal against stray light and dust and the like and also accurately center and support the pulse disc.

Abstract: A speed control device for the motor of a home sewing machine, comprising, a comparator having one input connected to a reference voltage, an output connected to the motor and another input, a first control circuit with a variable resistor connected to the other input of the comparator and a second control circuit with a low motor speed constant resistor and a switch connected to the same other input of the comparator.

Abstract: A console for a sewing machine comprises a supporting base which includes a rear wall with respective opposite sidewalls and a front wall hinged to one side wall which is openable and is provided with a cover at right angles to the upper edge thereof so that it forms in an open position a fabric support table. A carrier, including a plate portion which has a top surface for supporting the sewing machine and a back support is connected to the rear wall of the supporting base. The back support includes the lower part engaged with the supporting base and an upper part which is hinged to the lower part which is connected to the carrier to support the carrier in an operative position above the supporting base. In addition, a stirrup has a central portion pivotally connected to the carrier plate and a lower portion which is guided in slots in each side wall. The carrier in the upper position of the slot supports the carrier plate with the sewing machine in an operative position.