JPS5839904Y2 - dot printer - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a dot printer.

Conventionally, one type of dot printer uses a so-called moving coil, in which a coil is movably provided between fixed permanent magnets to drive the dot pin, and the dot pin is connected to a member around which this coil is wound. It is being

This type of coil has various drawbacks such as it is difficult to apply electricity to the coil because it moves, and the number of turns is limited because the mass and volume cannot be increased too much, making it difficult to manufacture. ing.

Another type of solenoid type is a solenoid type in which a bar-shaped movable iron piece is inserted into an electromagnetic core.

However, this type also has the disadvantage that the movable iron piece has a large mass and lacks high-speed performance, making it unsuitable for use in high-speed printing devices.

Furthermore, there are types that use ordinary electromagnets,
In this case, the inductance of the coil is large, making it unsuitable for high-speed printing.

This idea was developed in consideration of these points, and by using a permanent magnet as a movable body, the structure can be made simple and compact, and the inductance of the coil can be reduced to enable high-speed printing. The purpose is to obtain a dot printer that can

This idea involves installing a plurality of cores made of non-magnetic material in the printer rad, winding coils around each of these cores so that the current direction can be switched, and forming a fitting hole of a predetermined depth at one end in the longitudinal direction. , a permanent magnet with at least one pole inserted into these fitting holes is movably fitted, and the tip of the permanent magnet is arranged in a straight line so that the magnetic flux emitted from the one pole flows interlinked with the coil. The dot pins arranged in the dot pins are each integrally connected.

Therefore, since the core around which the coil is wound is made of a non-magnetic material, it has low inductance, which allows the current to rise quickly and enables high-speed printing, and since the movable body is a permanent magnet, the inductance is low. The structure is such that the recovery can also be carried out rapidly.

An embodiment of this invention will be described based on the drawings.

First, a recording paper 2 is wound and held on a platen 1, a printing ribbon 3 is suspended in front of the recording paper 2, and a printer head 4 that moves along the printing ribbon 3 is provided.

This printer head 4 has seven drive bodies 6 mounted at equal intervals on the inner surface of the outer peripheral side wall 5 of a door-shaped base 4a made of a non-magnetic material, and dot pins 7, which are movable bodies, align their tips on the same straight line. It is arranged so that the

That is, looking at the details of the drive body 6, a holder 8 made of a magnetic material is fixed to the side wall 5, and the holder 8 is coaxially fixed to the core 10 of a coil spool 9 made of a non-magnetic material. A coil 11 is wound around the spool 9.

Moreover, a fitting hole 12 is formed on the other side of the core 10 with a depth that reaches the inside of the coil 11.

A permanent magnet 13 is inserted into the fitting hole 12 so as to be slidable in the axial direction, and a buffer material 14 is adhered to the inner end surface of the permanent magnet 13.

The base end of the dot pin 7 is inserted and fixed in the center of the permanent magnet 13.

Such dot pins 7 are movably inserted into a pipe 16 held by a tube holder 15 fixed on the base 4a, and their tips are guided by a guide 17 and gathered together.

The other pole of the coil 11 connected to the power supply terminal 18 is connected to a transistor 20 via a capacitor 19, and a resistor 21 is connected in parallel to the coil 11 and the capacitor 19. The base of the transistor 20 has an input terminal 22 to which a control signal is applied.
is connected.

In such a configuration, as the printer head 4 is moved horizontally, a pulse-like input signal (FIG. 4a) from a control circuit (not shown) is sent to each drive body 6 in accordance with the characters to be printed.
given every time.

Specifically, a signal is applied to each input terminal 22, and the coil 11 is energized in the state shown in FIG. 4.

In such energization, since the core 10 is not magnetized by the permanent magnet 13, the inductance of the coil 11 is small and the rise is fast.

Therefore, the permanent magnet 13 is repelled and protrudes, and the dot pin 7 prints a dot.

Then, when the direction of the current to the coil 11 becomes reversed due to the influence of the capacitor 19, the permanent magnet 13 is attracted,
The holder 8 is magnetized by the permanent magnet 13, and the permanent magnet 13 is held in its original position.

The operation of the permanent magnet 13 with such coordination is based on the core 1
This is due to the fact that 0 is a non-magnetic material, and if the core 10 is a magnetic material, it will be magnetized by the permanent magnet 13 and the coil 1
In order to increase the inductance of 1, the coupling disappears.

In the above embodiment, the coil spool 9 and the core 10 are made of the same material, but they may be made of separate members.

As mentioned above, at least one pole of the permanent magnet is inserted into the core of the coil, and the dot pin is integrally connected to the permanent magnet, so the mass of the moving parts is small, and the core is non-magnetic. Because it is a body, the current rises quickly and has high speed, and the whole can be made compact.Also, since a permanent magnet is driven by a coil, a capacitor is used to utilize the repulsive force generated by it. Therefore, there is no need to switch the polarity for return, and sufficient driving energy can be obtained without using a large mass like a normal solenoid. Because the coil is not inserted into the core, the rest of the core is made of non-magnetic material by the permanent magnet, which reduces the inductance of the coil and allows for even more highly coordinated operation. It has the following effects:

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a plan view of the dot printer, Fig. 2 is a longitudinal cross-sectional side view of the driver, Fig. 3 is a circuit diagram, and Fig. 4 is an explanatory diagram of waveforms. . 4... Printer head, 7... Dot pin, 10... Core, 11... Coil, 12... Fitting hole, 13... ·····permanent magnet.

Claims (1)

[Scope of utility model registration request] The printer head is provided with a plurality of cores made of non-magnetic material, each of which is wound with a coil whose energizing direction can be switched, and a fitting hole of a predetermined depth is formed at one end in the longitudinal direction. A permanent magnet having at least one pole inserted into the matching hole is movably fitted, and the tips of the permanent magnet are arranged in a straight line so that the magnetic flux emitted from the one pole flows interlinked with the coil. A dot printer characterized by dot pins connected integrally.