JPH0467974A - Head gap adjusting device for printer - Google Patents

Abstract

PURPOSE:To obtain a head gap adjusting device for a printer, which can be constituted with a low cost by providing a manual operation means which can be moved by hand, resisting a pushing means and energizing force of an energizing means. CONSTITUTION:A shaft 14 of a pushing roller 15 is fitted in a first arm which is connected to a stay shaft 8 and a second arm 17 which turns using a supporting shaft 18 of a pin belt tractor as its support. Accompanying with the movement of the stay shaft 8, the pushing roller 15 moves in the direction to approach a fixed roller 4 or separate from the fixed roller 4, however, a printing head 5 moves together with the pushing roller 15, and therefore, a difference (t) of the printing head 5 and pushing roller 15 position to the running surface of a printing paper does not change all the time. Also, since the pushing roller 15 slides sideways together with the pin belt tractor 10 through the second arm 17, the pushing roller 15 is always located in the vicinity of both sides of the printing paper. As the result, it can be made by a simple constitution, and the cost can be drastically reduced to realize a low price.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer nod gear adjustment device for automatically adjusting the distance (head gap) between a print sheet and a print head to a predetermined value.

The head gap has a big impact on print quality, so
It must be adjusted to a constant predetermined value, regardless of the thickness of the printing paper used.

[Conventional technology]

Conventionally, a paper detection sensor is attached to a paper guide provided at the tip of the print head, and a drive motor moves the print head a predetermined distance away from the position where the paper detection sensor detects the print paper, that is, the position of the head gap cello. I was trying to create a predetermined spacing gap.

[Problem to be solved by the invention]

2. Description of the Related Art In recent years, so-called office automation equipment has become widely popular, and there is a demand for printer devices that are high-performance but inexpensive.

However, as described above, the conventional printer head cap adjustment device requires a drive motor and its drive circuit to adjust the head gap, making it expensive.

It is an object of the present invention to provide a head gap adjustment device for a printer that eliminates such conventional drawbacks, does not require a drive motor to produce a predetermined head gap, and can be configured at low cost. shall be.

[Means to solve the problem]

In order to achieve the above object, the printer head gap adjustment device of the present invention is provided so as to be able to approach and retract from the printing paper 100 side, as shown in FIG. 1 for explaining an embodiment. The pressing means 15 is arranged so that the distance between the printing paper 100 and the print head 5 becomes a predetermined value when the surface of the printing paper 100 is pressed, and the pressing means 15 is pressed against the printing paper 100. 100 surface, and manual operation means 21 that can manually move the pressing means 15 against the urging force of the urging means 20. shall be.

[Function] When sucking the printing paper 100, the manual operation means 21
By this, the pressing means 15 is moved against the urging force of the urging means 20, and the running path of the printing paper 100 is widened. Then, if the manual operation is released, the pressing means 1
5 is pressed against the surface of the printing paper 100 by the urging means 20, and the distance between the printing paper 100 and the print head 5 automatically becomes a predetermined value.

〔Example〕

Examples will be described with reference to the drawings.

FIG. 3 is a plan view showing the serial printer of the embodiment in a state before paper is sucked in, and FIG. 2 is a side view thereof.

In the figure, 2 and 2 are side frames provided on the left and right sides of the printer, between which a platen 3 and a fixed roller 4 are rotatably supported.

The print head 5 is attached to a carriage 6 so that its leading end faces the platen 3, and the carriage 6 is supported by being slidably fitted onto a stay shaft 8 so as to allow space movement.

The stay shaft 8 is not fixed to the side frames 1 and 2, and is provided so as to be movable toward and away from the fixed roller 4. As a result, print head 5
can move together with the stay shaft 8 and the carriage 6 so that the tip thereof approaches or moves away from the platen 3.

IO is a pin belt tractor for paper feeding. 11 is a paper conveyance path. Reference numeral 12 denotes a guide roller arranged at a corner of the paper conveyance path 11.

A pressing roller 15 is arranged opposite to the fixed roller 4, with the print paper running path in between. The pongee 14 of the pressing roller 15 is fitted into a first arm J6 connected to the stay shaft 8 and a second arm I7 which rotates about the support shaft 18 of the pin belt tractor as a fulcrum.

Therefore, when the stay shaft 8 moves, the pressing roller 15 moves toward or away from the fixed roller 4 accordingly. However, at this time, the print head 5 and the pressing roller I5 move together, so the print head 5 and the pressing roller 15 move against the running surface of the printing paper.
The difference t between the positions of always remains unchanged.

Further, the pressing roller 15 slides laterally together with the pin belt tractor IO via the second arm 17.

Therefore, the pressing roller 15 is always located near both measuring parts of the printing paper.

The stay shaft 8 is urged in a direction toward the fixed roller 4 by a compression coil spring 20. Also, against the biasing force of the compression coil spring 20,
A manual operation lever 21 or a fixed pin 2 for manually operating the stay shaft 8 in a direction away from the fixed roller 4
It is rotatably provided around 2.

Therefore, before suctioning the printing paper,
As shown in FIG. 2, operate the manual operation lever 21 to move the pressing roller 15 and print head 5 away from the fixed roller 4 and platen 3 to widen the paper travel path to prevent jams. .

FIG. 1 shows the state after the printing paper 100 has been sucked.

When the print paper 100 is sucked in and passes between the platen 3 and the print head 5, the manual operation lever 21 is released. Then, the stay shaft 8 is connected to the coil spring 29.
The pressing roller 15 is pressed against the surface of the printing paper 100 by the urging force of the coil spring 29. At that time, the printing paper 100 comes into contact with the surface of the platen 3,
Between the surface of the printing paper 100 and the tip of the print head 5,
A predetermined interval t is formed, and this interval t is
It is always constant regardless of the thickness.

Note that the present invention is not limited to the above embodiments,
For example, the platen may be moved by a manual operation lever, or may be slid from side to side together with a pressing roller or a guide for setting printing paper.

In the figure, 5...print head, 5...pressing roller (pressing means), 20...
- Coil spring (biasing means), 21... manual operation lever (manual operation means), 100... printing paper.

〔Effect of the invention〕

According to the printer head gap adjustment device of the present invention,
Since a drive motor and its drive circuit are not required to produce a predetermined spacing gap, the structure can be made very simple, and the cost can be reduced significantly compared to conventional methods. Has excellent effects.

[Brief explanation of drawings]

Figure 1 is a side view of the embodiment (after paper suction), Figure 2 is
A side view of the embodiment (before paper suction) and FIG. 3 are plan views of the embodiment. ■' First page view of the example (after paper suction) Figure 1

Claims (1)

[Scope of Claims] The printing paper (100) and the print head (5) are provided so as to be able to approach and retreat from the printing paper (100) surface, and when pressed against the printing paper (100) surface, the printing paper (100) and the print head (5) a pressing means (15) disposed such that the distance between the pressing means (15) is a predetermined value, and a biasing means (20) for biasing the pressing means (15) to press the surface of the printing paper (100); A head gap adjustment device for a printer, characterized in that a manual operation means (21) is provided that allows the pressing means (15) to be manually moved against the urging force of the urging means (20).