CS236821B1 - Stepping mechanism for setting of normal position - Google Patents

Description

The invention solves the problem of a stepping mechanism with simple and reliable contactless operation.

Each position of such a mechanism is unambiguously determined by the base position and the number of steps from that position.

The object of the invention is a mechanism in which the basic position is adjusted by a mechanical stop (6) operated by an auxiliary device. To solve this, the output wheel (4) is provided with a pin (5), into whose path a stop (6) engages on a rocking lever (14) provided with a spring (8) and an auxiliary solenoid (7). after reaching the basic position, this movement (6 J) prevents further movement.

This device can be used wherever unambiguous positioning of the mechanism is required, such as electromechanical digital and alphanumeric displays, slave clocks with automatic adjustment and the like.

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The invention relates to a stepping mechanism which enables the adjustment of the basic position by mechanically blocking the movement of the stepping mechanism.

The hitherto known stepping mechanisms most often consist of an electromagnetic circuit with a rotating armature and a gear transmission, but which do not have the possibility of adjusting the basic position in a contactless manner. Other non-contact base positioning mechanisms use other base positioning mechanisms and are thus a different way of control. The disadvantages of existing mechanisms are the unreliability of contact devices on the one hand and the complexity of other solutions on the other.

The above drawbacks are overcome by the mechanism according to the invention, which is based on the step mechanism being supplemented by a stop operated by an auxiliary device which prevents further movement of the mechanism when the base position is reached, even when the mechanism is permanently driven.

This arrangement combines the advantages of contactless operation with the operational reliability and simplicity of existing stepping mechanisms.

BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings, two exemplary embodiments of a step mechanism according to the invention are shown, wherein FIG. 1 shows a step mechanism controlled by polarized pulses for controlling one output shaft, and FIG. 2 shows a step mechanism for controlling two output shafts to control the minute and hour hands of the clock.

The stepping mechanism for adjusting the basic position according to FIG. 1 consists of a stepping mechanism consisting of an electromagnetic circuit 1 with a rotating armature 2 and a gearwheel 3 forming a transmission, including an output wheel 4. A pin 5 is fixedly connected to this wheel 4. for example, a digital indicator 10 can be connected to the output shaft 9 fixedly connected to the output wheel 4, if the current is not applied to the solenoid 7 of the stop 7, the stop 6 does not restrict movement the output wheel 4 and the device acts as a classic step mechanism. After applying the current to the solenoid coil of the stop 7, the force of the solenoid 7 overcomes the force of the spring 8 and the stop 6 is placed in the path of the pin S. In the defined basic position the pin S hits the stop 6 and thereby preventing further rotation of the output shaft. The cam 12 is fitted with a locking thumb 13 in the cutout of the cam 12, which is fixedly connected via the levers 14, 14a to the stop 6. This arrangement permits locking by the stop 6 only when the two output shafts 9 and 11 are defined relative to each other. This means that when the current is applied to the solenoid 7 of the stop 7 while the blocking thumb 13 is outside the area defined by the cam slot 12, the stop 6 does not attract the electromagnet 7 and thereby block the movement of the mechanism.

The method of controlling the stepper mechanism differs according to the application: For digital time indicators, a sufficient number of driving pulses is first set with the stop 6 closed, for example for a 60-position mechanism a min. 62 impulses. When the stop 6 is unlocked by interrupting the power supply to the solenoid 7, the desired position of the pointer 10 is set by the appropriate number of pulses. When controlling the slave clock, after waiting for the basic position (e.g. 00 h, 00 min). supplying minute pulses to the electromagnetic circuit 1 brings the mechanism into normal operation.

The described device is particularly suitable for controlling digital and alphanumeric indicators as well as the slave clock with automatic adjustment.

Claims (2)

Subject 1. A stepping mechanism for adjusting a basic position consisting of an electromagnetic circuit with a rotating armature and a gear transmission comprising an output wheel fixedly connected to an output shaft, characterized in that the output wheel (4) is provided with a pin (5) into which it extends a stop (6) mounted on the rocker lever (14) provided with a spring (8) and an auxiliary electromagnet (7). Stepping mechanism according to claim 1, characterized in that a cam (12) is mounted on the output shaft (9) parallel to the output wheel (4), with a notch (13) fixed on the rocker (14a) fixed to the lever (14).