JPS6120775A - Movable platen - Google Patents

Abstract

PURPOSE:To arrange so that a platen may be held at the best location to enable printing in high quality by providing a rotatable platen, a means to motivate around a rotary shaft and a means to adjust a rotating angle in a printer. CONSTITUTION:If the distance (d) between the back 30 of a platen metal 4 and the second support surface 22 is changed by turning an adjustment screw 20 clockwise or counter-clockwise, a platen 2 rotates either in ''B'' or ''C'' direction centering around a shaft 12 so that the front of a platen rubber 6 can be adjusted to be parallel with a head surface. That is, the front of a platen rubber 6 is positioned to run parallel with the head surface by turning the adjustment screw 20 and then an operator adjustes while making sure that the best print quality is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a grating used in a recording apparatus or the like, and more particularly to a platen in which the angle of the platen surface relative to the head can be adjusted using screws or the like.

[Prior art]

Generally, in a recording device such as a printer, the head surface and the platen surface are required to be parallel in the printed portion.

When the head surface and the 1277 plane are not parallel, deterioration in print quality such as missing prints and ♂ prints is noticeable. For this reason, conventional movable grates and fixed platens were invented.

As shown in FIG. 3, in the movable platen, a platen 102 is supported by a shaft 104 on the main body of the apparatus (not shown) and can be rotated in two directions as shown in the figure.
The door 106 is brought into contact with pressure and moved to.

When the platen 102 is pressed against the platen 106, the platen 1
The structure is such that the 020 plane and the plane of the head 106 are parallel to each other. However, with such a platen 102, the pressing force of the hect 106 must be strong when printing, but a strong pressing force has the disadvantage that printing quality deteriorates.

In addition, in a fixed platen, in order to apply parallel pressure between the head and the platen, the parts around the head and the parts around the platen must have extremely high precision. However, since the lifespan of the head is shorter than that of the device itself, the head must be replaced from time to time, and when the head is replaced, the printing quality deteriorates due to variations in the mounting accuracy of the head attachment parts. did.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide a printer platen with high printing quality in order to eliminate the above-mentioned drawbacks.

〔composition〕

In order to achieve the above object, the present invention includes a platen that is rotatably provided on a recording device main body, and a platen that is rotated around a rotation axis.
The present invention is characterized by comprising a biasing means for biasing the platen, and an adjusting means for adjusting the rotation angle of the platen.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings. FIG. 1 is a schematic perspective view of a movable platen according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the movable platen and its surroundings, taken along the line n--n in FIG.

As shown in FIG. 1, the grating 2 has a platen rubber 6 fixed to the front surface of a platen metal fitting 4 having an L-shaped cross section, and a protrusion 8 on the side of the platen metal fitting 4 that protrudes laterally beyond the platen rubber 6. is provided, and the end portion of the protruding portion 8 is bent 90 degrees to form a key portion 10. A shaft 12 is provided in the key portion 10 in parallel with the longitudinal direction of the platen 2, and the shaft 12 is supported by a part of a recording device (not shown).

As shown in FIG. 2, the platen metal fitting 4 has an L-shaped cross section, and a biasing means is provided between the platen metal fitting 4 and the first support surface 16 of the frame 14 fixed to the main body of the recording apparatus. The barrel leaf spring 18 is compressed. An adjustment screw 20 serving as adjustment means is screwed into the protrusion 8 (FIG. 1) of the grating metal fitting 4, and the tip of the adjustment screw 20 is brought into contact with the second support surface 22 in front of the frame 14.

In FIG. 2, 24 is a paper feed roller, 26 is a pinch roller, and 28 is a guide plate.

The platen 2 is rotatably supported on a recording device (not shown) by a shaft 10, so that it can rotate around the shaft 12. Further, a leaf spring 1 is compressed between the platen fitting 4 and the first support surface 16.
8, the grating 2 receives a moment of rotation in the middle direction in FIG.
Since the tip of the grating 2 is in contact with the second support surface 22 of the frame 14, the grating 2 is held in a fixed position. When the adjustment screw 20 is turned with a screwdriver or the like, the tip of the adjustment screw 20 comes into contact with the second support surface 22 and does not move, but the grating metal fitting 4 screwed onto the adjustment screw 20 rotates around the shaft 12 by a small amount. The distance d between the back surface 30 of the grating metal fitting 4 and the second support surface 22 can be changed by moving the grating.

Next, the operation of this embodiment will be explained. Adjustment screw 20
When the distance d is changed by turning left or right, the platen 2 rotates the shaft 12 in directions B and C in the figure, and the front surface of the platen 6 becomes parallel to the head surface (not shown). It can be adjusted as desired. That is, while actually operating the recording device and printing, the adjustment screw 20
The adjuster adjusts the adjustment screw 20 while making sure that the front surface of the platen rubber is flat and parallel to the front surface, and that the best printing quality is obtained.

In this embodiment, a leaf spring is used as the biasing means, but other types of springs and elastic bodies such as f-mu may be used.

Furthermore, it is a matter of opinion that the shape of the platen is not limited to the cross-sectional shape, but may be of other shapes.

Further, in this embodiment, the adjustment screws 20 are provided on both sides of the silaten 2, but they may also be provided on only one side.
In this embodiment, the mounting position of 0 is also provided below the shaft 12, but it can also be provided above the shaft 12.

〔effect〕

As described above in detail and concretely, according to the present invention, printing can be performed while holding the rotatable grating at an optimum position using the adjustment screw, thereby achieving high-quality printing.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a movable platen according to an embodiment of the present invention, FIG. 2 is a sectional view of the movable platen and its surroundings, taken along FIG. 1 - ■, and FIG. 5 is a perspective view of a conventional movable grating. In the figure, 2... a platen, 18... a plate spring, and 20... an adjustment screw.

Claims (1)

[Claims] (1) a platen rotatably provided on the recording apparatus main body; a biasing means for biasing the platen around a rotation axis;
A movable platen comprising: an adjusting means for adjusting a rotation angle of the platen.