JPH0634249B2 - Card punching device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device used for punching and so-called punching when clearly indicating the frequency of use in a card such as a public telephone, and other similar applications.

[Prior Art] Conventionally, for a purpose of punching a card such as a public telephone, an electromagnetic force is generally used as a power source, and an object having a certain mass is rapidly moved by an attractive force of an electromagnet. A punching pin attached to this object is used to make a hole in the card.

[Problems to be Solved by the Invention] In general, a device using electromagnetic force uses an iron core or a ferrite core as a core material, and since a certain amount of winding is applied to the core material, (1) the mass as a whole is large. To become a,
(2) The magnetic field generated by the current flowing in the winding is used as the generating force source, but the energy loss in the iron core and winding is large.
(3) Be a source of electromagnetic noise. (4) Since a magnetic field is generated, there is a problem in that there is difficulty in designing due to the influence on the magnetic card.

Therefore, the technical problem of the present invention is to design a card that has a light weight as a whole, energy loss is essentially small, electromagnetic noise is small, and a magnetic field is not generated. To provide a device.

[Means for Solving the Problems] According to the present invention, an elastic rod, a fixing member for fixing one end of the elastic rod, and a card provided at the other end of the elastic rod and opposed to a card to be punched. In a card punching device provided with a pin having a sharp line portion, a strain applying unit that applies strain to the elastic rod in the card direction, and a storage that stores strain energy applied to the elastic rod by the strain applying unit. There is provided a card punching device having means and means for canceling the accumulation of the strain energy and punching the card with the pin.

In the present invention, it is preferable to use two laminated piezoelectric actuators. One actuator stores strain energy in the elastic rod and the other piezoelectric actuator stores the strain energy of the elastic rod. The large displacement and force at one end is used as the power source for punching.

[Operation] In the present invention, by applying a voltage to the strain applying means and the accumulating means having the piezoelectric actuator on the elastic rod, a displacement is given to press the elastic rod in a direction perpendicular to the axis of the elastic rod, When the releasing means is operated after the energy is stored, that is, the voltage of the piezoelectric actuator is turned off, the elastic rod is momentarily lowered to be converted into kinetic energy, and the pin is lowered to collide with the card to form a through hole.

[Embodiment] FIG. 1 is a diagram showing a basic configuration of the present invention. In this figure, one end of an elastic rod 1 serving as a motion source is fixed by a jig 2. The laminated piezoelectric actuator 3 is for the purpose of applying a load between the punching pin 5 at the tip and the fixing jig 2 to store bending elastic energy in the entire rod. The punching pin 5 is composed of a sharp line portion for punching and a head portion.

The laminated piezoelectric actuator 4 serves to press the elastic rod in the axial direction and fix the punching pin 5 having a constant mass so as not to move. After applying a voltage to the laminated piezoelectric actuator 4 to fix the punching pin 5, the laminated piezoelectric actuator 3 pressurizes the elastic rod 1 in a direction perpendicular to the axis to store the elastic energy in the elastic rod 1. After that, the punching pin 5 that turns off the voltage of the piezoelectric actuator 3 momentarily descends to release strain energy. The punching pin having a constant mass due to the initial velocity at this time is largely displaced by inertia, and the pin violently collides with the card 6 to form a through hole in the card. Table 1 summarizes the main items of the related parts that were prototyped based on the principle of Fig. 1.

FIG. 2 shows the applied voltage to the actuator 3 and the moving width of the punching pin 5. The voltage applied to the actuator 4 was kept constant at 50 V, and the width increased in accordance with the increase in the applied voltage, and when it exceeded 100 V, it exceeded 2 mm. This is much larger than the value calculated by simply calculating the free displacement of the tip of the cantilever. The reason is that the punching pin 5 having a constant load moves due to inertia due to the initial velocity when the stored strain energy is suddenly released, and the momentum required to punch a card is sufficiently obtained. It was confirmed.

[Advantages of the Invention] As described above, according to the present invention, by using the laminated piezoelectric actuator, 1) the weight can be designed as a whole.

2) Energy loss is essentially small.

3) Generation of electromagnetic noise is small.

4) There is an advantage that the degree of freedom in design is greatly improved because no magnetic field is generated.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of a card punching device of the present invention. FIG. 2 is a diagram showing the voltage applied to the actuator 3 and the operating width of the punching pin operated by the configuration of the present invention. 1 is an elastic rod, 2 is a fixing jig, 3 and 4 are laminated piezoelectric actuators, 5 is a punching pin, and 6 is a card. 7, 7'denotes a DC power source, and 8, 8'denotes a switch.

Claims (1)

[Claims] 1. An elastic rod, a fixing member for fixing one end of the elastic rod, and a pin provided at the other end of the elastic rod and having a sharp line portion facing a card to be punched. In the card punching device, strain applying means for applying strain to the elastic rod in the card direction, accumulating means for storing strain energy applied to the elastic rod by the strain applying means, and accumulating the strain energy And a releasing means for perforating the card with the pin, the card punching device.