DE8901925U1 - Electromechanical swing for Black Forest miniature children's clock with up - down swing - Google Patents

Description

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The invention relates to an electro-mechanical oscillator with a mechanical swing element (pendulum, spring pendulum, rotating pendulum), a permanent magnet, a coil and an electronic control system, in particular for Schwarzwald miniature children's clocks with up-down swing.

Black Forest miniature children's clocks all have eye-catching, striking moving parts based on Black Forest motifs. The purpose of the invention is to make a traditional costume doll sitting on a swing move up and down.

These swing clocks are very well known and are driven by a spring winding mechanism, which operates the clock and the traditional doll swing at the same time. A smooth-running spiral tension spring is attached in the immediate vicinity of the spring mechanism, to the lower end of which the traditional doll swing is attached.

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A lever from the spring mechanism engages the spiral spring,

which moves the spring a small distance every second

pulls apart at the bottom. This creates the up-down rocking motion.

The spiral spring loaded with the traditional doll swing has a significant impact on the accuracy of the clock and it is almost impossible to display an accurate time throughout the entire winding period. In order to regulate the clock, the traditional doll swing must be hung higher or lower on the spiral spring until the movement is correct. This takes a considerable amount of time. In addition, the swing mechanism uses so much power from the pedal mechanism that a maximum running time of around 20 hours can only be achieved.

The invention is based on the task of equipping the clock with a modern, inexpensive, battery-operated quartz clockwork and also generating the up-down movement of the traditional doll swing.

This object is achieved according to the invention in that a separate electromechanical oscillator is operated independently of the quartz movement with the same drive battery.

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There are electronic pendulum drives in which the coil and permanent magnet form the oscillating circuit of a self-oscillating actuator. This results in high power consumption and high costs.

There are also pendulum drives in which the anode impulse for the coil is generated by a freely oscillating oscillator. The disadvantages here are problems with the natural frequency of the mechanical oscillating elements matching the frequency of the anode oscillator, the long-term and temperature stability of the anode oscillator and the high costs.

The aim of the invention is to provide a cost-effective, tunable and reliably functioning electronic circuit for an electromagnetic oscillator.

An example of the invention is shown in the drawing and is described in more detail below. Bs show

Fig. 1 a circuit arrangement
Fig. 2 a diagram

Fig. 3 an example of a bin construction in a Black Forest - Miniature children's clock old traditional doll swing

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The core of the electronic control circuit is the cross-connected transistors Tl and TS, which represent a semiconductor switch. The switching process is triggered by overshooting the base-battery loop voltage of transistor Tl. By switching through transistor Tl, the positive potential of the charged capacitor C1 reaches the base of transistor T2, which then switches through. This drives a current through coil 3 until the capacitor C1 has discharged through resistor R2 and the transistor combination Tl T2. The transistors Tl T2 switch off, the capacitor C1 is then recharged through resistor Rl and the process starts again.

Synchronization with the mechanical oscillating element 5

together with the following ahangton T*~S£rli%SB. ⁿ U ⁿⁿ S!£Sch£Ul£Sl 9 is achieved as follows:

The base of transistor Tl is at the direct voltage potential of battery voltage 7 minus Zener voltage of Zener diode Zl. Superimposed on this potential is the voltage on coil 3, which is generated by magnetic induction of the permanent magnet 6, which is attached to the mechanical oscillating element 5. If the repetition frequency of the switching process described above is sufficiently small, i.e. smaller by a factor of the natural frequency of the mechanical oscillating element 5, the base

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The base voltage of transistor T1 is always exceeded close to the low point of the induction voltage of coil 3 superimposed on the base potential of transistor T1. Energy is therefore fed into coil 3, not at every possible point in time, but always in phase. This process is illustrated in a diagram in Figure 2.

According to the invention, the entire electronic control is housed in the battery current collector 8.

Claims (11)

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