Abstract: A magnetic encoder system (2) of a sewing machine drive comprises a disk (5), which is magnetized, an incremental track (8) and a reference track (9). The incremental track (8) extends completely around the disk (5) and has alternating pole elements (10), which serve as incremental markings. The reference track (9) is designed as a ring-shaped section on the disk (5) and has a monopole (11). The result is a magnetic encoder system (2), for example for a servo motor of a sewing machine.

Abstract: An electric motor comprises a flange at one end, the corner portions of the flange projecting over the outline of the stator. A ventilator is provided at the opposite end, having outlets which are in alignment with the corner portions. The ventilator does not project over the borderline of the flange.

Abstract: A flange motor for a sewing machine comprises a motor casing with a drive shaft journal projecting over the latter. A casing flange, on which an adapter flange is mounted, is allocated to the drive shaft journal.

Abstract: A method for digitally sensing and storing a sewing pattern for an industrial sewing machine. To make the sensing process fast and free of error, the invention provides that, starting from a null position of the driving step motors, the fabric carrier is moved under program control in such a fashion that a sewing pattern, disposed on the carrier for the material to be sewn, is scanned 2-dimensionally, the incremental x and y positional data of each step motor always being stored, when the sensor detects a bright-dark contrast on the sewing pattern. Further, for manual input or for making corrections, a device is provided, which is distinguished by a rotary device for setting the desired directional angle of the same pattern. This rotary device can be activated in a direction perpendicular to the rotation-adjustment plane, counter to a reset spring, to initiate a contact.

Abstract: In a position indicating device, especially for an industrial sewing machine, with a slotted wheel (3) and a first track (6) of slots (4) having, e.g., 512 slots (4), to permit a null-point synchronization over a relatively small range of rotational angles, and the establishment of definite angular positions, a second track (8) with slots (7) of various widths is provided. The first track (6) of slots (4) is associated with two light barrier arrangements comprising emitters (11a, 11b), receivers (12a, 12b), and masks (13a, 13b) while the second track (8) is associated with one light barrier arrangement. Evaluating systems are connected to the receivers (12) so that, on the basis of the number of slots (4) of the first track (6), the size of the slots (7) passing in each case and corresponding approximately to a multiple of the slot width may be determined through evaluating systems (14, 28) connected to the output, and in this manner to define the rotary angle position.

Abstract: A rotor for an electric motor, energized by a permanent magnet, has an essentially cylindrical rotor body (1), with shaft sections (7, 8) coaxially distant from the rotor body (1). Permanent magnets (21) are fastened to the outer periphery (16) of the rotor body (1). In order to counterbalance the rotor, balance weight rings (6), in which weights (26) are inserted and which are disposed on seat sections (5) formed on the rotor body (1), are mounted on the rotor body (1).

Abstract: A rotor for an electric motor energized by permanent magnet means comprises positioning devices for permanent magnets. These positioning devices consist of positioning rings disposed in the region of each end face of a rotor body and at least one inner positioning ring disposed on the rotor body between the two. The positioning rings comprise positioning webs which extend only over a small part of the length of the outer peripheral surface of the rotor body and which partially define compartments for in each case a permanent magnet. On the one hand, this ensures accurate and simple mounting of the permanent magnet while at the same time it reduces the moment of inertia of the rotor.

Abstract: In an electric motor regulating and control drive, especially for industrial sewing machines, a clutch-brake disk is mounted for co-rotation on an output shaft and has a clutch facing which can be brought into engagement with a clutch surface of a flywheel of the corresponding motor, and has a brake facing which can be brought into engagement with a brake surface of a brake-bearing plate. In order to achieve by simple means an effective suppression of impact noises when a braking action is initiated, at least the brake facing is mounted with damping with respect to the armature ring of the clutch-brake disk. It is preferably thrust against the armature ring by means of at least one annular spring.

Abstract: In a drive for a sewing machine, especially an industrial sewing machine, with a needle that can be reciprocated between an upper and lower end position by a sewing machine main shaft, in which the drive is in direct driving connection with the main shaft and can be controlled at variable speed through a control system, provision is made for improving the dynamic performance of the combination of drive and sewing machine by equipping it with at least one input switch connected electrically to the control system for the input of command pulses for the step-wise actuation of the drive such that with each command pulse a certain, defined amount of movement of the drive and hence of the main shaft is triggered.

Abstract: An industrial sewing machine having a main shaft which can be driven by an electric motor drive, a positioner disposed on the main shaft, a regulating and control system controlling the electric motor drive, an operating and display system, and an interface system producing the connection between the operating and display system on the one hand and the regulating and control system on the other. Such an industrial sewing machine is to be configured such that great freedom from electrical interference will be achieved in spite of the individual connection of additional unfiltered electrical components.

Abstract: An electromotive variable-speed and control drive particularly for use in industrial sewing machines comprising a motor capable of continuous drive with a disk flywheel and a brake-coupling unit connected to this motor. Cooling ribs confining cooling channels are disposed at the stator frame to achieve efficient cooling. A disk flywheel in the form of a fan is in the form of an axial-radial blower the suction area of which extends to the coupling surface of the disk flywheel. Furthermore, particularly intensive cooling of the brake end shield is possible.

Abstract: An electromotive variable-speed and control drive particularly for use in industrial sewing machines and comprising a coupling coil casing radially surrounding a coupling-brake disk and a brake coil casing radially relocated towards the center. Both are positioned in the brake end shield. In order to avoid a sticking of the coupling-brake disk with high alternations and a delay of the break-down and build-up of the magnetic fields, a brake coil casing has been relocated radially so near to the center that it is situated within the brake pad in front of the armature ring. On the other hand, there is an undercut and a recess at the coupling coil casing and a recess at the disk flywheel which assures that no axial forces can occur at the radial gaps.

Abstract: An electromotive control drive mechanism, in particular for industrial sewing machines, comprises a continuously drivable motor and a brake/clutch unit connected therewith. A clutch disk connected in a rotationally fixed manner with a driven shaft can, by axial movement and by overcoming a clutch air gap, be brought into frictional engagement with a clutch support which is connected in a rotationally fixed manner with the rotor of the motor. A brake disk connected in a rotationally fixed manner with the driven shaft can be brought into frictional engagement with a brake support which is rotationally fixed. A clutch coil and a brake coil are also provided. In order to reduce the expense of the brake/clutch unit without burdensome actuation noises arising, only one clutch/brake disk is provided, and mechanisms are provided for adjusting the clutch air gap and the automatic readjustment of the clutch air gap.

Abstract: A multiple rotary drive system for a textile-working machine has first and second clutch-brake units. Each clutch-brake unit has a rotatable flywheel, a non-rotatable brake surface, and a rotatable shaft to be driven, whereby the rotatable shaft can be connected to the textile-working machine as a rotary drive of the system therefor. A clutch disc and a brake disc of each clutch-brake unit are connected to the shaft thereof for rotation therewith and are arranged for controllably engaging with, respectively, the flywheel for rotatably driving the shaft therefrom and the brake surface for braking rotation of the shaft therefrom. The flywheel of the first clutch-brake unit is rotationally driven, whereby the drive system can be driven by a continuously-rotating shaft of a continuously-operating electric motor. A belt extends about each flywheel for coordinate rotation of the flywheels when the one is rotatably driven by the electric motor.

Abstract: A belt guard for clutch motors for industrial sewing machines comprises a cover made of two cover halves which can be clapped together. This cover extensively covers a V-belt pulley part of which accommodates a V-belt. In order to achieve an effective ingoing belt safety device which can be adapted to suit a variety of V-belt pulley diameters without exceeding the permissible maximum distances to the ingoing V-belt section on the one hand and to the V-belt pulley on the other the ingoing belt safety device comprises a safety pin extending into the wedge-shaped area between the ingoing V-belt section and the V-belt pulley. This pin can be attached to a safety slide bar fixed to a cover half in an adjustable manner, or to a disc serving as a mount for the cover halves.

Abstract: In a clutch-and-brake unit for use with a continuously rotating, motor-driven shaft, for example in an industrial sewing machine, a single disk has a clutch surface on one side and a brake surface on the other side. The disk is magnetically urged into operative engagement with clutch and brake pressure plates facing the respective clutch and brake surfaces of the disk, the clutch pressure plate being rotated by the motor-driven shaft to rotate the disk and a shaft connected thereto when operatively engaged, and the brake pressure plate being non-rotatable to brake the shaft. The brake pressure plate is also constantly urged into light contact with the brake surface sufficient to brake the disk and shaft only when the disk is not operatively engaged with the clutch pressure plate. This prevents the disk and connected shaft from rotating when neither the clutch nor the brake are operatively engaged and eliminates engagement noise when the brake pressure plate is operatively engaged.

Abstract: In a method and circuit for executing an address jump command in a stored-program sequential-control system for operating machine tools or the like, an address counter is settable to a desired count and is able to count in a stepwise manner from any initial count therein and a program memory is provided which is connected to the output of the address counter and has data stored therein corresponding to each address which either is associated with the actuation of an output generator for the machine tools or the like or with the actuation of a jump command generator interrogation circuit. A first signal is generated when the data corresponding in an address is associated with the actuation of a jump command generator and the address counter is controlled when a jump command is present from the interrogated jump command generator to set the address counter to a new count which represents the jump address.

Abstract: An arrangement for energy economy in a drive which includes an induction motor and a clutch-brake unit, particularly for sewing machines is provided. The windings of the induction motor are dimensioned so that the motor speed remains virtually constant in a stable speed range under normal service conditions, and in which the clutch-brake unit serves to control the drive output speed, so that the motor operates in an alternation of load phases and no-load phases. Switches are included in the current paths of the windings, which reduce the current through the windings to a prescribable degree. A modulation circuit to control the acceleration of the motor speed and its persistence in the stable speed range during load variations is associated with the switches. The modulation circuit contains a delay element, which is triggered when the mains voltage is applied, and an impulse prolongation element having a time constant dimensioned so that the motor remains in the stable speed range under all service conditions.

Abstract: An arrangement for securing a housing cover, especially useful for securing a cover for a switch box having electrical switching devices therein includes at least one screwable element which can be threaded to the housing and which is secured undetachably on the cover by a stop on its shaft. The shaft extends through the cover, each of the screwable elements extending through a bottom of an indentation in a surface of the cover. A pre-stressed compression spring is disposed in the indentation between a shoulder of the screwable element and the base of the indentation. Each screwable element comprises a shaft nut, the shaft nut having a shaft with an indentation in its pressure-receiving face. The shaft engages with a threaded pin attached to the housing and rests against a structural part which is supported against a support attached to the housing. The screwable element is centered by a centering body positioned directly ahead of the support on the threaded pin.

Abstract: An actuation apparatus for a control switch which, in accordance with the position of a switching member, produces various control signals, in which an actuation arm coupled with the switching member is provided. The actuation arm is pivotable out of a central position of rest about a pivoting shaft counter to the restoring force of a torsion spring provided with free arms. A respective stationary initial stop is provided for each arm for the purpose of fixing the arm position in the position of rest and in which at least one coupler in contact with the free arms is connected with the actuation arm. At least one second stop, which acts as an end stop, is operatively associated with each free arm of the torsion spring to define the end of the switching paths.