Abstract: An essentially iron-free linear motor for a sewing device or sewing machine produces and controls the pressure on the material being sewn by means of a drive rod, with a tubular housing, with at least two annular permanent magnets located therein. Each of the magnets has a north pole and a south pole and is magnetized radially, each in a different magnetization direction, and with a coil divided into at least two partial coils wound in opposite directions and each associated with a permanent magnet, whereby the partial coils and the permanent magnets are mutually displace, involving drive rod, in a magnetic lock that is effected by the housing, by a core in the form of center piece, and an air gap with the coil. The partial coils are located inside housing and the permanent magnets are located between said coils and the center piece.

Abstract: An actuating device intended for a sewing device or sewing machine includes a material pressing device for holding down the material to be sewn during stitch formation and transport, and at least one linear motor which serves as regulating element for the material pressing device. The drive rod of the actuating element is connected to the material pressing device so as to control the pressure the pressing device exerts on the material to be sewn. The drive rod is linked to the pressing device via at least one elastic low-mass coupling element and the pressing device can be placed by the linear motor back and forth between a raised and a lowered position.

Abstract: Processor arrangement for sewing apparatus for the operational control of at least one sewing device, including accessories, and for regulating the rotational speed of a positioning drive mechanism which drives the sewing device. The operating control characteristics as well as the rotational speed control characteristics are predeterminable and modifiable by digital programming signals of a programmer.

Abstract: A motor including an electromagnetically actuated friction clutch and friction brake for respectively transferring a driving torque and/or a braking torque to an output shaft. A rigid hub is rotationally fixed on an output shaft of the motor for rotation therewith. A first axially deflectable spring washer is connected to an annular shaped clutch disk, with a second axially deflectable spring washer being connected to a brake disk. The clutch disk and brake disk are axially movable by a magnetic force and are adapted to be pressed against a driving pulley and a braking block respectively. The hub is fashioned as a one piece member and a supporting ring is disposed axially between the clutch disk and the brake disk.

Abstract: The position adjusting drive unit for a sewing machine having its work shaft driven by an electromotor with an adjustable rotary speed, includes a supporting box connected to the electromotor and including a power supply transformer and an activation mechanism for a signal generator for desired and actual values of the rotary speed of the motor and of the angular position of the working shaft; an exchangeable printed circuit board supports all electrical and mechanical component parts of the speed regulating and angular position adjusting circuits including the signal generators and the coupling rod between the activation mechanism in the supporting box and the part of the activation mechanism on the circuit board is guided into the proper coupling position when the circuit board is electrically connected to the power supply transformer.

Abstract: An arrangement for protecting a belt has a cover element arranged to at least partially surround a belt pulley, and a hood element arranged on the cover element and adjustable relative to the other in direction normal to the axis of the belt pulley. The hood element may be telescopically displaceable over the cover element and fixable to the same. The hood element may also be formed as a bellows with an adjustable length.

Abstract: A positioning drive for a serving machine of the type having a variable speed motor and functional means driven by the motor. A microprogram system controls the motor and the functional means in response to a program data source.

Abstract: A drive control, for example for a sewing machine, for controlling speeds and positioning of of a drive shaft driven by a drive motor includes a control box accommodating a speed control circuit and a positioning control circuit and a nominal value pick up which is releasably attachable with respect to the control box. The nominal value pick up can be fixedly adjusted on the control box.

Abstract: The position adjusting drive unit for a sewing machine having its work shaft driven by an electromotor with an adjustable rotary speed, includes a supporting box connected to the electromotor and including a power supply transformer and an activation mechanism for a signal generator for desired and actual values of the rotary speed of the motor and of the angular position of the working shaft; an exchangeable printed circuit board supports all electrical and mechanical component parts of the speed regulating and angular position adjusting circuits including the signal generators and the coupling rod between the activation mechanism in the supporting box and the part of the activation mechanism on the circuit board is guided into the proper coupling position when the circuit board is electrically connected to the power supply transformer.

Abstract: A driving arrangement with a friction clutch has at least one clutch element arranged to transmit torque and forming a friction face, and at least one lubricating storing container carried by the clutch element and arranged for accommodating a lubricating medium and distributing the latter over the friction face. The clutch element may be provided with a friction member forming the friction face and constituted of cork. The lubricant storing container may be formed as a hollow ring whose hollow is connected with the friction face so as to provide a dosed passage or the lubricating medium to the latter.