JPS61169258A - Shuttle type line printer - Google Patents

Abstract

PURPOSE:To make it possible to accurately stop a hammer bank at a home position, by determining the stop position of a stop plate by the magnetical attraction force generation mechanism in the side of a printer main body when the stop signal of the hammer bank is generated. CONSTITUTION:A current is supplied to the coil 15 of a lower yoke part 12 during the shaking of a hammer bank 3 to negate the magnetic flux of the permanent magnet plate 11 of a magnetical attraction generation apparatus 20. Because of this, the stop plate 19 passing through a gap G does not receive any effect and the shaking motion of the hammer bank 3 is normally performed. Next, when a stop signal is issued, the supply of a current to a movable coil type linear motor 7 and the coil 15 is stopped and the magnetic flux of the permanent magnet plate 11 is generated and the stop plate 19 receives external force to the direction shown by an arrow A to move by the inertia itself and easily and certainly stops at a home position of a magnetically stable state. Therefore, the control at the time of re-start becomes easy and the reckless driving of the hammer bank can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement of a shuttle type line printer device that uses a moving coil type linear motor as a swinging drive source. This invention relates to a line printer device that has a fixed position stop function that always stops at a predetermined Baum position when stopping the printer.

[Conventional technology]

FIG. 4 is a sectional side view of a main part for explaining the structure of a conventional shuttle type line printer device using a moving coil type linear motor.

A moving coil type sunar moke is a motor that uses electromagnetic force generated by energizing a coil in a magnetic field to apply linear force to the coil, and speed control is easy.

■ A trapezoidal speed curve suitable for high-speed printing can be easily created 7y7.

■Since the movable part and fixed part do not come into contact with each other, there is no wear or heat generation due to contact.

Recently, line printers adopting the wooden sword type are becoming popular.

As shown in FIG. 4, a conventional shuttle type line printer device includes a hammer hank 3 that is placed on a rail 2 of a base 1 and prints on paper (not shown) while moving in the direction of arrow A-A'. , a swing control circuit that controls energization to the moving coil 4 based on information from a moving coil type linear motor 7 that is the power source of the hammer bank 3 and an edge sensor 9 that detects the direction change position of the hammer bank 3. The structure includes a control section 8 consisting of:

However, while the moving coil type linear motor 7 generates an electromagnetic force proportional to the current when energized, speed control is easy, but when the energization is cut off, the moving coil type linear motor 7 loses its binding force and the hammer bank 3 will run due to inertia in the direction of the swing at that time.

Therefore, it is unknown at what position during the swing stroke the hammer bank 3 will stop, and depending on the situation, the hammer bank 3 may run out of control, for example, between the moving coil end 4' and the yoke bottom 6'.
Situations such as conflicts may also occur. Further, since the stop position is unstable, it is necessary to take time for the hammer bank 3 to move to the printing start position upon restart, and the control becomes complicated.

[Problems to be Solved by the Invention] The present invention has been made in order to improve the drawback of the conventional device in which the stop +L position of the hammer bank changes depending on the timing of power cutoff. In other words, the present invention allows the hammer bank to always operate at a predetermined position even if the power is turned off under any conditions.
It is unique in that it stops at both the front and the bottom.

[Means for resolving issues]

The second problem is that a thin stop plate made of a magnetic material is attached to the hammer bank that prints while swinging left and right, and when the stop signal of the hammer bank is issued, the stop plate stops the printer. Generates magnetic attraction with an electromagnet and a permanent magnet mounted on the main body side of the device! ": 1" is solved in a shuttle-type line printer device configured to have a stop position determined by a mechanism.

[Effect]

The present invention utilizes the fact that when a magnetic body such as a piece of iron is placed in a magnetic field without contact, the piece of iron tends to remain in a magnetically stable position. The iron piece, which swings in a −° body with the hammer bank, passes through a magnetic flux circuit whose magnetic flux is canceled by an electromagnet, while when stopping the hammer bank, the electricity to the electromagnet is cut off. The magnetic attraction force of the magnetic flux circuit is applied to the iron piece, and the hammer bank is stopped at a predetermined home position by the attraction force.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of main parts showing the overall configuration of a shuttle type line printer according to the present invention, and FIG. 2 is a perspective view of main parts showing an example of the structure of a magnetic attraction force generating device section installed in the same printer. It is a diagram.

However, the same reference numerals refer to the same objects throughout the plan.

As shown in FIG. 1, the line printer device of the present invention includes a pair of stop plates 19 fixed to the lower part of the hammer bank 3, and a magnetic field into which the L-shaped bottom part of the stop plates 19 is loosely inserted. A part of one stop plate formed in an R-shape (the bottom part of the L-shaped part) is connected to the gear G of the magnetic attraction force generation mechanism 20 (see FIG. 2). ), and moves in the direction of the arrow AA' within the gear G as the hammer bank 3 swings.

The stop plate 19 is made of a magnetic material such as soft iron or permalloy.

The structure of the magnetic attraction force generating device installed in the line printer device of the present invention will be explained below with reference to FIG.

The magnetic attraction force generating device 20 has a coil 15 disposed in the center, and a pair of permanent magnet plates 11° and a lower yoke 12 disposed on both sides thereof. Further, an upper yoke 13 is provided on the upper part of the permanent magnet plate 11 so as to face the magnet plate 11.
The lower yoke 12 and the upper yoke 13 are each fixed to a fixed circuit section 16.

Note that there is a gap G between the permanent magnet plate 11 and the upper yoke 13.
As described above, the stop plate 19 is loosely inserted into the gear G, and the coil 15
- The magnetic flux acting on the stop plate 19 changes by turning on and off the energization.

Next, the operation of the present invention will be explained with reference to FIGS. 1, 2, and 3.

FIG. 3 is a sectional side view of a main part schematically showing the operating principle of the present invention, and fat is a state in which the hammer bank is swinging;
b) is the state when the stop signal is issued to the hammer bank, (
C) shows a state in which the hammer bank is stopped.

First, the state shown in FIG. 3 F8+, in which the hammer bank 3 swings left and right to perform printing, will be explained.

As shown in the figure, while the hammer bank 3 is swinging, the lower yoke 1
The coil 15 wound around the magnet 2 is energized, and the magnetic flux generated by the coil 15 cancels out the magnetic flux of the permanent magnet plate 11. Therefore, the stop plate 19 passing through the gear G is not affected by the magnetic flux in any way, so that the hammer bank 3 swings normally.

Next, when a stop signal is issued to hammer bank 3,
As shown in Figure (b), the power to the moving coil type linear motor 7 and the coil 15 is cut off, and the magnetic flux of the coil 15 disappears, so that a flow of magnetic flux 18 of the permanent magnet plate 11 occurs.

Therefore, one of the swinging stop plates receives an external force in the direction of the arrow and moves in the direction of the arrow while being influenced by its own force. Then, as shown in 3r21(C), it stops in a magnetically stable state (Bohm position).

In the state shown in FIG. 3(C), the stop plate 19, that is, the hammer bank 3
is at a predetermined Baum position, restart control is extremely easy, and printing can be performed immediately after startup.

Furthermore, even if the power is suddenly cut off due to some kind of failure while the hammer bank 3 is swinging, the hammer bank 3 will return to the hole position and stop due to the above-mentioned magnetic attraction force generation mechanism 20, so that no runaway operation will occur. Danger is avoided.

Furthermore, even when transporting the device, the force that stops the hammer bank 3 in the Baum position is always working, so there is no need to fix the hammer bank 3, which saves time and effort.

〔Effect of the invention〕

According to the shuttle type line printer device of the present invention, the hammer bank can be easily and precisely stopped at a predetermined Baum position, making it easy to control when restarting. 2. Runaway of the hammer bank is prevented. It is highly effective in preventing

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts showing the overall configuration of a shuttle-type line printer according to the present invention, and FIG. 2 is a perspective view of essential parts showing an example of the configuration of a magnetic attraction force generating device section installed in the printer device. , FIG. 3 is a sectional side view of the main part schematically showing the operating principle of the present invention, and FIG. 4 is a side sectional view for explaining the structure of a conventional Schafer type line printer device using a moving coil type linear motor. FIG. 2 is a side sectional view of a main part. In the figure, 1 is a base, 2 is a rail, 3 is a hammer bank, 4 is a moving coil, 5 is a permanent magnet, 6 is a yoke, 7 is a moving coil type near moke, 8 is a control unit, 11 is a permanent magnet plate, 1
2 is the lower yoke, 13 is the upper yoke, 15 is the coil, 1
Reference numeral 6 indicates a circuit fixing portion, 18 indicates a magnetic flux, 19 indicates a stop plate, 20 indicates a magnetic attraction force generating device, and G indicates a gear.

Claims (1)

[Claims] This is a shuttle type line printer device in which a movable coil type linear motor is used as a drive source for a hammer bank, and the hammer bank, which performs printing while swinging from side to side, is equipped with a stop plate made of a magnetic material member, and the stop plate The linear motor is characterized in that when power to the linear motor is turned off, the stop position is determined by a magnetic attraction force generating mechanism that includes an electromagnet and a permanent magnet and is installed on the main body side of the printer device. Shuttle type line printer device.