JPS59146876A - Shuttle mechanism for line printer - Google Patents

Abstract

PURPOSE:To provide the titled mechanism capable of reducing consumption of electric power, wherein only magnetic attracting force is utilized when changing the direction of a hammer bank equipped with a printing head. CONSTITUTION:A movable coil 11 is fitted to one end of the hammer bank 8, while an iron piece 12 is fitted to the other end, and both the coil 11 and the iron piece 12 a placed in a magnetic fild of permanent magnets 14. A rightward movement of the hammer bank 8 is effected by a straight forward force generated when passing an electric current to the coil 11 and an attracting force exerted on the iron piece 12, while a leftward movement is effected by an attracting force exerted on the iron piece 12 (a force so exerted as to bring back the iron piece 12 into the magnetic field which force is generated when the iron piece 12 tends to move out of the magnetic field due to inertia). By these forces, the hammer bank 8 is braked, stopped and is again accelerated in the reverse direction, whereby a shuttle returning is effected.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a shuttle type printer device that prints while swinging a hammer bank equipped with a print head. The present invention relates to a shuttle mechanism for a line printer.

(b) Prior art and problems There are two types of shuttle mechanisms for conventional line printer devices: one using a link mechanism and the other using a cam mechanism.
A method using a moving coil type linear motor is also being considered.

The speed curve obtained using the link mechanism is shown in Figure 1 (a) l.
With the sinusoidal waveform a shown in the figure, it is difficult to achieve a constant velocity section suitable for high-speed printing, and it is difficult to control the speed of the hammer bank. In addition, depending on the shape of the cam, the speed curve obtained using a cam mechanism can easily have a trapezoidal waveform suitable for printing conditions as shown in Figure 1 (B), but due to motion transmission, ζ
This requires that the cam contour surface and part of the movable part always be in contact with each other, which causes problems such as contact pressure and heat generation. In the system using a moving coil type near moke shown in FIG. 2, when the hammer bank 1 moves to the left end or right end, it reciprocates by the force in the opposite direction from the linear motor 2. hammer bank 1
To increase the speed of the oscillation, it is necessary to increase the acceleration in order to speed up the rise at the time of return, and in order to increase the acceleration, it is necessary to increase the current flowing through the coil 31 of the linear motor 2, which reduces consumption. The disadvantage is that the power tends to be large.

Note that 4 is a yoke, 5 is a permanent magnet, 6 is an iron core, and 7 is a bobbin.

(c) Object of the Invention The object of the present invention is to provide a shuttle mechanism for a line printer that reduces power consumption by using only magnetic attraction when changing the direction of a hammer bank equipped with a print head. Our goal is to provide the following.

(d) Structure and object of the invention According to the present invention, a hammer bank equipped with a print head (printing is performed while swinging the hammer bank by driving a moving coil type linear motor provided therein). In the shuttle type printer device, one end of the hammer bank is equipped with a movable linear motor that can output a linear force over the entire printing stroke, and the other end is equipped with an iron piece that can freely move back and forth in a straight line in a magnetic field. It is thus achieved to provide a shuttle mechanism for a line printer device characterized in that it is equipped with the following.

(e) Examples of the invention Embodiments of the present invention will be described in detail below with reference to FIG.

FIG. 3 is a sectional view showing one embodiment of the shuttle mechanism of the line printer device of the present invention.

In the figure, a hammer bank 8 equipped with a print head is mounted on a base plate 9 so as to be able to swing through a bearing 10, and a movable coil 11 is mounted on one end of the hammer bank 8, and a movable coil 11 is mounted on the other end of the hammer bank 8. An iron piece 12 is added here.This iron piece 12 is normally attached to the side plate 13 that is fixed to the board 91.
It exists in the magnetic field of one permanent magnet 14 attached, and is installed so that it can freely move back and forth in a straight line according to the shuttle stroke.

Further, the moving coil 11 is also installed so that it can exist within the magnetic field of the permanent magnet 14 attached in the same manner. Note that 15 indicates a yoke and 16 indicates a center yoke. To start this hammer bank 8, the linear force generated when the movable coil IN is energized is used, but the subsequent shuttle return is indicated by the arrow in the state of Fig. 3. As shown in FIG. This is done only by the attractive force of the iron piece 12. This attractive force is the force that acts to bring the iron piece 12, which is the owner of the iron core 12, back into the magnetic field, when it tries to jump out of the magnetic field due to the inertia ζ.

4- With this force, the hammer bank 8 is braked, stopped, and then accelerated again in the opposite direction to perform a shuttle return.

According to this method, power is consumed only during shuttle return on one side, and power consumption can be significantly reduced.

By arranging the moving coil so that it is always present in the magnetic field over the entire area of the shuttle, one-way speed control can be easily achieved by simply energizing the moving coil in one direction. I will do my best to do it.

FIG. 5 shows another embodiment of the invention.

The difference from FIG. 3 is that iron pieces 12 are installed at both ends of the hammer bank 8. In this example, a movable coil 11 and an iron piece 12 are attached to one end of the hammer bank 8, and only the iron piece 12 is attached to the other end. This iron piece 12 is installed so that it always exists in the magnetic field and can freely move back and forth in a straight line according to the shuttle stroke. When starting or braking this hammer bank 8, the moving coil 11 (the linear force generated when energized) is used; however, during shuttle operation, the moving coil 11
The magnetic field uses the attractive force generated by the iron piece 12 located in the magnetic field at the position t. In addition, in Fig. 5, the hammer bank 8 is at the left end of the shuttle stroke.
The force acting on the iron piece 121 at this time is indicated by an arrow. The energization of the moving coil 11 during operation is limited to only the correction when the shuttle speed decreases.

According to this method, power is mainly consumed only during initial startup and final control, and almost no power is consumed during normal operation, resulting in extremely low power consumption. Therefore, it is not necessary to run as much current through the coil of the linear motor in order to speed up the swinging of the hammer bank 1 as in the prior art, so a shuttle mechanism with reduced power consumption can be provided.

(f) Effects of the Invention As explained in detail above, the shuttle mechanism of the line printer device of the present invention is equipped with a print head, and the end shaft of the hammer bank outputs a linear force over the entire printing stroke v. Equipped with a movable type near motor, the other end ζ
This shuttle returns by using magnetic attraction force that does not consume staining force because it is equipped with a hanging iron piece that moves freely in a magnetic field and moves in a straight line. Since there is no need to pass current,
This has the effect of keeping power consumption extremely low.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are waveform diagrams showing the speed curve of a conventional shuttle mechanism, Figure 2 is a diagram for explaining the shuttle mechanism of a conventional line printer, and Figures 3 and 4 are from this book. FIG. 5 is a cross-sectional view showing one embodiment of the shuttle mechanism of the Line 1 Nonta device of the invention, and FIG. 5 is a cross-sectional view showing another embodiment of the invention. In the figure, 8 is a hammer bank, 9 is a board, 10 is a bearing, 11 is a moving coil, 12 is an iron piece, 13 is a side plate,
14 is a permanent magnet, 15 is a yoke, and 16 is a center yoke. Dankaku*3 Figure 5 Figure 428

Claims (2)

[Claims] (1) In a shuttle mechanism of a line printer device that prints while swinging the hammer bank by driving a moving coil type linear motor provided in a hammer bank equipped with a print head, one of the hammer banks One end is equipped with a movable linear motor capable of outputting a linear force over the entire stroke area for printing, and the other end is equipped with an iron piece that can freely move back and forth in a straight line in the magnetic field generated by the magnetic field generator. A line printer device characterized in that the direction change of the hammer bank is performed by the linear force of a movable type 11 near motor at one end of the hammer bank and the force that attracts an iron piece at the other end into the magnetic field. shuttle mechanism. (2) A position equipped with the movable linear motor (this is where an iron piece that can freely move back and forth in a straight line in the magnetic field of the movable linear motor is added, and when the hammer bank is initially started, completely stopped, and speed corrected) (The first aspect of the present invention is characterized in that the linear force of the movable linear motor is used, and the normal direction change of the hammer bank is performed by the force that attracts the iron piece into the magnetic field.) Shuttle mechanism/