JPS6260675A - Printer - Google Patents

Abstract

PURPOSE:To appropriately set relative positions of a printing means and a platen through a simple construction, by supporting a guide rod on a support member fixed to a fixed part of a printer and providing a means for adjusting the position of the support member. CONSTITUTION:A guide rod 2 is supported by frames 10, 10a through support members 12, 12a. To adjust the position of the rod 2, the rod 12 is fixed to the support members 12, 12a with screws 15, 15a so that the rod 2 will not move leftward or rightward, and setscrews 20, 20a are untightened so that eccentric collars 17, 17a can be rotated. Then, a hammer 8 is operated to actually print a character on a paper 9 set on a platen 1, and a printed condition is checked. When a lower part of the printed character is low in density, the collars 17, 17a are rotated to lift the support members 12, 12a upward together with the rod 2 with cam parts 18, 18a of the collars.

Description

TECHNICAL FIELD The present invention relates to a printer in which printing means is supported on a carriage movable along a guide rod, and the printing means prints on paper on a platen.

PRIOR ART Printers of the above type configured as daisy printers, wire dot printers, etc. are well known in the art; in daisy printers, the printing means are configured as type, and in wire dot printers, the printing means are configured as a plurality of wires. In this type of printer, it is necessary to arrange the printing means and the platen at appropriate relative positions. This is because if this relative position is inappropriate, the same characters printed on the paper may overlap locally, leading to a risk that the print quality will deteriorate. For this reason, conventionally, the platen has been separated from the printer frame and supported so that its position can be adjusted, and the position of the platen relative to the printing means can be adjusted when manufacturing the printer or during maintenance and inspection. A printer configured so that the relative position can be kept within an appropriate range is known. However, with this configuration, the platen cannot be directly assembled to the printer frame, so the structure for supporting the platen becomes complicated.

The disadvantage was that the number of parts increased.

1. It is an object of the present invention to eliminate the above-mentioned conventional drawbacks and to provide a printer of the type described at the beginning, in which the relative positions of the printing means and the platen can be properly set with a simple structure.

The present invention proposes a configuration in which the guide rod is supported by a support member fixed to a fixed part of the printer, and an adjusting means for adjusting the position of the support member is provided. According to this configuration, by adjusting the position of the guide rod, the relative position of the printing means and the platen can be adjusted.

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

FIG. 1 is a side view showing a part of the printer, in which a cylindrical platen 1 extending in a direction perpendicular to the plane of the drawing is rotatably supported in a manner known per se, and a guide rod extending parallel to this platen 1. A carriage 3 is slidably fitted to 2. Further, a roller 4 supported by the carriage 3 is rotatably placed on a guide rail 5 parallel to the guide rod 2. The carriage 3 supports a selection motor 6, a daisy wheel 7 rotated by the motor 6, a hammer 8, and the like.

During the printing operation, the selection motor 6 brings the printed characters (printing means) 7a of the daisy wheel 7 to a position facing the platen 1, and the hammer 8 operates in the six directions of arrows, thereby separating the printed characters 7a and ink (not shown). The paper 9 hung on the platen 1 is struck through the ribbon. As a result, the characters of type 7a are printed on the paper. The carriage 3, together with the elements supported by it, moves in a direction perpendicular to the plane of the paper in FIG. 1 while being guided by the guide rod 2 and guide rail 5, so that predetermined characters are printed one by one on the paper. be done.

Since the printing operation is performed as described above, the printing quality will deteriorate unless the platen 1 and the printed characters 7a facing it maintain a predetermined correct positional relationship. In the illustrated example, it is necessary to maintain the relative position in the vertical direction correctly, and if this is incorrect, the upper or lower part of the same character printed on the paper will become thin.

Further, when a plurality of sheets of paper, for example, 5 to 7 sheets, are stacked and characters are printed simultaneously on these sheets, the closer the paper is to the platen 1, the stronger the tendency for the sheets to become locally thin. To eliminate this drawback, the daisy wheel 7
It is sufficient to assemble the platen 1 and the platen 1 so that their vertical relative positions are correct, but since the selection motor 6, hammer 8, etc. are supported on the carriage, there may be errors in the dimensional accuracy or assembly errors of these elements during assembly. As a result, it is difficult to correctly set the relative position of the daisy wheel 7, especially the type 7a, and the platen 1.

For this reason, conventionally, as explained above, the platen was made adjustable in the vertical direction and its position was adjusted to keep the relative position between the platen and the type 7a within an appropriate range.
However, it was not free from drawbacks such as a complicated structure.

Therefore, in the configuration according to the present invention, the carriage is guided, but the position of the guide rod can be adjusted.The specific structure and operation thereof are as follows.

2 and 3, to a fixed part of the printer, in the example shown a pair of frames 10.10a.

Window hole 11 to determine the position of Guy 1 Herotsu 1 Ri 2. lla are drilled, and each end of the guide 1 hero 1-2 is inserted into these window holes 11. lla respectively. Further, a support member 12°L2a is arranged from the outside of each frame 10, 10a, and the end of the guide rod 2 is supported in a support hole 13.13a formed in the upper part of each support member 12.12a. Screw hole 14 at the horizontal upper end of 12, 12a,
A guide rod 2 is fixed to each support member 12.12a by a screw 15.15a screwed into 14a. The upper part of the support member +2, 12a has a window hole 1 as shown in FIG.
1 and lla, respectively.

The support member 12.12a has a horizontally elongated hole 1.
6, 16a is drilled, and an eccentric collar 17.17a is installed here.
A cam portion 18.18a is inserted. Eccentric collar 1
A through hole 19° 19a is formed in 7.17a, and two cylindrical cam portions 18.18a are eccentric with respect to the through holes 19, 19a, respectively. Set screws 20, 208 are inserted through the through holes 19.19a, and these screws are attached to each frame 10.
, 10a are screwed into screw holes 21, 21a formed in the holes 21, 21a. Further, each support member 12.12a has protrusions 22, 22a formed by, for example, half punching, and these protrusions are inserted into vertically elongated oval guide holes 23.23a formed in each frame 10.10a. They are slidably fitted.

With the above configuration, the guide rod 2 is supported by the support member 12° 12a.
To adjust the position of the guide rod 2, fix the guide rod 2 to the support member 12.12a with screws 15.15a so that the guide rod 2 does not move from side to side. Then, loosen the set screw 20.20a to allow the eccentric collar 17.17a to rotate. Then, the hammer 8 is operated to actually print characters on the paper 9 on the platen 1, and the printing state is confirmed. At this time, if the lower part of the printed characters is outdated, the eccentric collars 17, 178 are rotated, and the support member 12.12a is lifted upward together with the guide rod 2 by its cam portion 18.18a. Next, characters are printed on the paper again using the hammer 8, and this is confirmed. Repeat this operation until the density of the printed characters becomes uniform, and then tighten the set screws 20, 20.
8 to secure the support member 12.12a.

Of course, if the upper part of the letters is thin, use eccentric color 17°17a.
The guide rod 2 is lowered by rotation of the guide rod 2, and the setscrews 20, 20a are tightened when the density of the printed characters becomes uniform. When the support member 12° 12a is moved up and down, the protrusions 22, 22a are aligned with the guide holes 23.23a.
support members 1.2, 1.2a
can be moved up and down correctly. In this way, the relative position between the platen 1 and the printed characters 7a can be easily set to the correct printing position.

To make the above operation easier, first use the guide rod 2.
Frame 10. It is inserted into the lower part of the window holes 11 and 11a of the IOa, and the characters printed at that time are inserted into the window holes 11. Determine the position of lla. Then, while checking the condition of the printed characters, check the eccentric color 17.1.
7a, the supporting members 12, 1.2a and the guide rod 2 are raised little by little, and when the thinness of the lower part of the printed characters can no longer be confirmed (this position is the proper printing position), the eccentric collar 17.17a Stop spinning.

Tighten set screw 20.20a and attach support member 12°+2a
Conveniently, it is fixed to each frame 10.10a. Of course, first insert the guide rod 2 into the two parts of the window holes 11 and 11a, then set the position of the window so that the upper part of the printed character is on the line, and then insert the support member 12.12a and the guide rod 2. The proper printing position may be secured while lowering the printer.

The guide rod 1-2 is supported by a support member 12.12a, and when this member 12.12a is made of an elastic material,
It is advantageous that the support member 12°L2a absorbs vibrations after the printing operation and can obtain an allocating effect.

The above-mentioned adjustments can be made at appropriate times, such as when manufacturing the printer and during its maintenance and inspection.

In the illustrated embodiment, an eccentric collar and a slot formed in the support member are used as means for adjusting the position of the support member, but other suitable means may also be used. Alternatively, a spacer may be inserted between the guide rod and the frame, and the position of the guide rod may be adjusted by changing the thickness or number of spacers.

It goes without saying that the present invention can be applied to other printers than daisy printers, such as wire tod printers.

According to the present invention, since the position of the guide rod can be adjusted, it has become possible to adjust the printing means and the platen to appropriate printing positions with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional side view showing a part of the printer according to the present invention, FIG. 2 is an exploded perspective view showing the guide rod and support member separated from the frame, and FIG. 3 is a guide rod with the support member removed. FIG. 3 is a sectional view showing a state in which the device is supported on a frame via the device. ■...Platen 2...Children's rod 3...
Carriage 9・Paper 12.12a・Support member Fig. 1

Claims (1)

[Scope of Claims] In a printer in which a printing means is supported on a carriage movable along a guide rod, and the printing means prints on paper on a platen, the guide is attached to a support member fixed to a fixed part of the printer. A printer that supports a rod and is provided with adjustment means for adjusting the position of the support member.