JPS61152477A - Gap regulating mechanism for printer - Google Patents

Abstract

PURPOSE:To exactly regulate the gap of printer by a method in which a main scale and a subscale are provided to a shuttle mechanism in such a way as to enable the moving distance of the base for fitting the shuttle mechanism in relation to the body to be read out by the main scale and the subscale. CONSTITUTION:In the body 10, a main scale 16 is provided movably on the main scale holder plate 7 fixed to the body, and a subscale 18 is provided to the base 13 for fitting a shuttle mechanism in the face of the main scale. When the base 13 on which the mechanism 14 is mounted is moved to the direction of a platen 19, the front face 15a of printing section collides with the platen 19, where the gap is in zero position. Under the condition, the main scale 16 is matched with the zero position of the scale 18 and fixed. While measuring the gap by both the scales 16 and 18, the base 13 is moved separately from the platen 19. When set gap is reached, the base 13 is fixed to the body 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanism for adjusting the gap (hereinafter referred to as the gap) between the printing section and the platen of a wire dot line printer.

[Problems to be solved by conventional technology and invention]

Conventionally, in wire dot printers, the movement of the printing wire is constant, so when the thickness of the printing paper differs, especially when multiple sheets of printing paper are used as is the case these days, the printing part and platen are It is necessary to precisely adjust the gap between

FIG. 4 is a diagram showing a conventional gap adjustment method. This is to move the platen shaft 1 back and forth using a cam 2. By rotating the cam shaft 3, the eccentric disk cam 2 attached to the cam shaft 3 moves the platen shaft 1, and the platen 4 and the printing section 5 are connected to each other. The gap G between them can be adjusted. However, this method has the disadvantage that when setting the gap, the amount of movement of the platen shaft 1 must be calculated based on the rotation angle of the cam shaft 3, which is very time consuming. Also, a shuttle mechanism 6 for swinging the printing section 5
On the other hand, since the printing part 5 is removable, when the printing part 5 is attached to the shuttle mechanism 6 and the gap is set,
This is done after aligning the front surface 5a of the printing section 5 with the platen 4, but even if the platen 4 and the front surface 5a of the printing section are kept parallel at that time, the movement axis 7 of the printing section 5 and the shuttle mechanism 6 will not move as shown in FIG. If they are not parallel, the movement of the shuttle mechanism 6 will cause a difference in the gap between the left and right sides, resulting in a problem of uneven print density between the left and right sides of the printed paper.

[Means for solving problems]

The present invention provides a gear adjustment mechanism for a printer that solves the above-mentioned problems. A mechanism for adjusting the gap between the platen and the printing section of a dot printer,
A shuttle mechanism mounting base is provided on the top surface of the main body, which can slide using a groove provided in a direction perpendicular to the center axis of the platen as a guide, and has a shaft hole perpendicular to the sliding surface. A shuttle mechanism is mounted so as to be rotatable about the shaft hole, and a main scale is provided on the main body, and a vernier scale is provided on the shuttle mechanism, and the main scale and the vernier scale are used to attach the shuttle mechanism mounting base to the main body. This is done by a gap adjustment mechanism of a printer characterized in that the distance traveled can be read.

[For production]

The gap adjustment mechanism of the above-mentioned printer is such that the parallelism of the front surface of the printing section to the platen can be adjusted by rotatably mounting the shuttle mechanism on the shuttle mechanism mounting base. The gap can be adjusted by making it possible to move in a direction perpendicular to the swinging direction of the printing part along the same axis, and the amount of movement can be precisely read using the main scale installed on the main body and the vernier scale installed on the shuttle mechanism mounting base. , the amount of gap can be known.

〔Example〕

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

FIG. 1 shows an embodiment of the present invention in a perspective view, and FIG. 2 shows a side view. In both figures, 10 is the main body 11.1r
12 is a guide groove, 12 is a shaft hole, 13 is a shuttle mechanism mounting base, 14 is a shuttle mechanism, 15 is a printing section, 16 is a main scale, 17 is a main scale holding plate, 18 is a vernier scale, and 19 is a platen. There is.

In this embodiment, as shown in FIG. 1, a guide groove 11.1r is provided on the upper surface of the main body 10 in a direction perpendicular to the central axis of the platen 19, and the guide groove 11.1r is provided above the guide groove 11.1r. A shuttle mechanism mounting base 13 is provided which can slide using lr as a guide and has a shaft hole 12 in the center, and has an abutting part 14a for positioning the printing part on the base and a shaft that fits into the shaft hole 12. A shuttle mechanism 14 is mounted so as to be rotatable about the shaft hole, and a printing section 15 is positioned and fixed on top of the shuttle mechanism 14 by an abutting section 14a. The main body 1O is also provided with a main scale 16 that is movable on a main scale holding plate 17 fixed to the main body, and the shuttle mechanism mounting base 13 has a section 14 for moving the shuttle mechanism. It is provided parallel to the axis, and can be easily aligned when the printing section 15 is removed and mounted on the shuttle mechanism 14 again. Further, this positioning means is not limited to abutment of a surface, but may be provided with a positioning pin, for example, and may be fixed using the positioning pin as a reference.

In this embodiment configured in this manner, when the base 13 on which the shuttle mechanism 14 is mounted is moved toward the platen 19, even if the printing section 15 is tilted with respect to the platen axis, printing is possible. The front surface 15a and the platen 19 abut against each other and are in a parallel state as shown in FIG. In this state, the shuttle mechanism 14 is fixed to the base 13. The state in which the front surface 15a of the printing section and the platen 19 butt each other is a position where the gap is zero, and in this state, the main scale 16 shown in FIG. 1 is aligned with the zero position of the vernier scale 18 and fixed. Then, move the base 13 away from the platen 19 while measuring the gap with the main scale 16 and the vernier scale 18, and when the set gap is reached, move the base 13 away from the main body 1.
Fixed to 0. In this way, the gap can be easily adjusted.

〔Effect of the invention〕

As described above, according to the present invention, the shuttle mechanism is provided with the abutting part for positioning the printing part, the shuttle mechanism is rotatable on the shuttle mechanism mounting base, and the shuttle mechanism is rotatable on the shuttle mechanism mounting base, and a With a vernier scale attached to the base and a main scale attached to the main body,
After making the print section parallel to the shuttle mechanism and the print section parallel to the platen, by moving the shuttle mechanism mounting base, the gap is the same at any position and the gap distance can be varied. In addition, there is no need to convert the amount of movement as with cams, etc. (there is an effect that the gap can be directly measured from linear movement).

[Brief explanation of the drawing]

Fig. 1 is a perspective view of essential parts showing one embodiment of the gap adjustment mechanism of the printer of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a diagram for explaining the gap adjustment, and Fig. 4 is a conventional one. FIG. 5 is a perspective view showing the main parts of the gap adjustment mechanism of the printer, and is a diagram for explaining its drawbacks. In the figure, 10 is the main body, tt and tr are guide grooves, 12 is a shaft hole,
13 is a shuttle mechanism mounting base, 14 is a shuttle mechanism, 15 is a printing section, 16 is a main scale, 18 is a vernier scale, and 19 is a platen.

Claims (1)

[Claims] 1. A mechanism for adjusting the gap between the platen and the printing section of a wire dot line printer, which is equipped with a printing section consisting of a plurality of hammer units and a shuttle mechanism that swings the printing section from side to side. It can slide using a groove provided on the top surface perpendicular to the center axis of the platen as a guide.
A shuttle mechanism mounting base having a shaft hole perpendicular to the sliding surface is provided, and a shuttle mechanism having a printing portion is mounted on the base so as to be rotatable about the shaft hole, and the main body is provided with a shuttle mechanism mounting base having a shaft hole perpendicular to the sliding surface. 1. A gap adjustment mechanism for a printer, characterized in that a scale and a vernier scale are respectively provided on the shuttle mechanism mounting base, and the moving distance of the shuttle mechanism mounting base with respect to the main body can be read using the main scale and the vernier scale.