JPH05246105A - Printing gap adjusting device - Google Patents

Abstract

PURPOSE:To provide a printing gap adjusting device adaptable to changes of paper thickness and temperature. CONSTITUTION:Eccentric bushings 5 and 6 fixed at both ends of a carrier shaft 4 are received by bearings 3. On a face opposing a first gap adjust lever 12 engaged with the periphery of the eccentric bushing 6 and a second gap adjust lever 13 to be rotated integrally with the eccentric bushing 6, a detent 14 is provided so as to rotate the first and second gap adjust levers 12, 13 integrally and displace an axial core of the eccentric bushings 5, 6 and the carrier shaft 4, so that a gap between a print head and a printing stage is adjusted in accordance with type of paper and the change of temperature. While the stopping position of the detent 14 is changed and the position of the first gap adjust lever 12 is not changed, only the second gap adjust lever 13 is rotated and the axial core of the eccentric bushings 5, 6 and the carrier shaft 4 is displaced so as to adjust the gap in accordance with the change of temperature and the type of paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print gap adjusting device used in a serial printer.

[0002]

2. Description of the Related Art First, a conventional example will be described with reference to FIGS. Bearing portions 3 are provided on the side plates 1 and 2 facing each other, and eccentric bushes 5 and 6 are fixedly fitted to the bearing portions 3 at both ends of a carrier shaft 4. That is, both ends of the carrier shaft 4 are formed to have a D-shaped cross section, and the eccentric bushes 5, 5 are correspondingly formed.
The shape of the hole of 6 also has a D-shaped cross-sectional shape (see FIGS. 7 and 8). The eccentric bushes 5 and 6 are rotatably fitted to the bearing portion 3. The right eccentric bush 6 is formed integrally with the gap adjusting lever 7. Although not shown, the carrier on which the print head facing the stamp is mounted is slidably fitted on the carrier shaft 4.

Here, as shown in FIGS. 7 and 8, in the eccentric bushes 5 and 6, the center of the hole, that is, the axial center of the carrier shaft 4 is eccentric with respect to the center of the radius of the outer circumference. Further, the bearing 3 is also eccentric with respect to the center of the radius of the outer periphery, and the centers of the holes for holding the eccentric bushes 5 and 6 are eccentric. .. Further, the gap adjusting lever 7 is integrally formed with a projection 8 and a locking claw 9. Then, in the side plate 2, a plurality of locking holes 10 locked by the projections 8 and arc-shaped elongated holes 11 by which the locking claws 9 are locked are radii about the axis of the eccentric bush 6. It is arranged and formed above.

In such a conventional structure, when the lever 3a is gripped and the bearing portion 3 is rotated, the outer periphery of the bearing portion 3 is fitted to the side plates 1 and 2, and the center of the radius of the outer periphery is constant. Therefore, the center of the hole into which the eccentric bushes 5 and 6 are fitted is displaced. As a result, the centers of the eccentric bushes 5 and 6 and the carrier shaft 4 are also displaced. Therefore, by rotating one or both of the left and right bearing portions 3 in an arbitrary direction by an arbitrary angle, the carrier shaft 4 with respect to the stamp base 4 is rotated.
The parallelism of can be adjusted. The bearing portion 3 is held at an arbitrary position in the rotating direction by a detent (not shown).

In printing, it is necessary to adjust the gap between the printing plate and the print head according to the thickness of the paper used. This adjustment is performed by an operation of rotating the gap adjusting lever 7 by an arbitrary angle. That is, this operation causes the eccentric bush 6 to rotate together with the carrier shaft 4 and the eccentric bush 5. These eccentric bushes 5,
Since the outer circumference of 6 is held by the bearing portion 3, the center of the hole holding the carrier shaft 4 is displaced with respect to the center of the radius of the outer circumference. Therefore, the position of the shaft center of the carrier shaft 4 with respect to the printing plate is changed, and thereby the gap between the printing plate and the print head is adjusted.

[0006]

The operation of adjusting the gap between the print head and the printing plate in accordance with the type of paper is as follows.
This can be easily done by indicating the adjustment position of the gap adjusting lever 7 corresponding to the type of paper. On the other hand, if the temperature changes depending on the environment in which it is used, the stamp board, the side plates 1, 2,
Since the carrier, the print head, etc. expand or contract due to the temperature change, the absolute value of the set value of the gap corresponding to the specific paper changes. Generally, the usage environment is 1
It ranges from low temperature of 0 ℃ to high temperature of 40 ℃.
The gap cannot be accurately adjusted in consideration of the paper type and the temperature change.

[0007]

According to the present invention, there is provided a carrier shaft for slidably guiding a carrier on which a print head is mounted along a printing plate, and a pair of carrier shafts fitted at both ends of the carrier shaft so as not to rotate. Eccentric bush, a bearing portion that rotatably holds these eccentric bushes, a first gap adjustment lever that is rotatably fitted to the outer periphery of one of the eccentric bushes, and this first gap adjustment A second gap adjusting lever that faces the lever and rotates integrally with one of the eccentric bushes; and a second gap adjusting lever arranged on a radius centered on a rotation axis of the second gap adjusting lever. It is composed of a gap adjusting lever and a detent formed on a surface facing the second gap adjusting lever.

[0008]

According to the present invention, the first and second gap adjusting levers can be rotated together while maintaining the first and second gap adjusting levers in a locked state by the detent. The gap between the print head and the printing plate can be adjusted by displacing the shaft center of the eccentric bush that rotates integrally, the carrier shaft, and the other eccentric bush. Also, by changing the locking position of the detent, even if only the second gap adjusting lever is rotated without changing the position of the first gap adjusting lever, the axial center between the eccentric bush and the carrier shaft is displaced. It is possible,
By rotating both the first and second gap adjusting levers, the gap adjustment corresponding to the paper type or the temperature change can be performed. In addition to this operation, the second gap adjustment for the first gap adjusting lever can be performed. By changing the relative position of the lever, the gap adjustment corresponding to the temperature change or the paper type can be performed. Therefore, the gap adjustment corresponding to the paper type and the correction of the absolute value of the gap due to the temperature change can be performed. It can be divided and operated easily and correctly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. The parts having the same structures as those of the conventional structure described with reference to FIGS. As shown in FIG. 1, the first gap adjusting lever 12 rotatably fitted to the outer periphery of the eccentric bush 6 on the right side.
And a second gap adjusting lever 13 integrally formed at one end of the eccentric bush 6. The projection 8 and the locking claw 9 are integrally formed on the first gap adjusting lever 12, and a plurality of locking holes 10 locked by the projection 8 and an arc-shaped elongated hole through which the locking claw 9 is locked. And 11 are arranged on the side plate 2 on a radius centered on the axis of the eccentric bush 6.

A detent 14 is formed on the facing surfaces of the first and second gap adjusting levers 12 and 13. As shown in FIG. 2, the detent 14 has three recesses 15 arranged on the side surface of the first gap adjusting lever 12 on a radius centered on the rotation axis of the second gap adjusting lever 13. , A protrusion 16 formed on the second gap adjusting lever 13 and elastically locked in any of the recesses 15.

In such a structure, the first and second gap adjusting levers 12 and 13 can be held in a locked state by the detent 14 and can be rotated together. Thereby, the eccentric bush 6 integrated with the second gap adjusting lever 13, the shaft center of the carrier shaft 4, and the left eccentric bush 5 can be displaced to adjust the gap between the print head and the printing plate. .. Also, the protrusion 1
Even if only the second gap adjusting lever 13 is rotated without changing the position of the first gap adjusting lever 12, the eccentric bush 5,
The gap between the print head and the printing plate can be adjusted by displacing the shaft center of the carrier shaft 4 and the carrier shaft 4.

Therefore, for example, the position of the first gap adjusting lever 12 is displayed corresponding to the type of paper, and the relative position of the second gap adjusting lever 13 with respect to the first gap adjusting lever 12 is used to change the temperature. By correspondingly setting, the first gap adjusting lever 12 and the second gap adjusting lever 13 can be rotated together to perform the gap adjustment corresponding to the type of paper. The deviation of the value due to the temperature change can be prevented by changing the relative position of the second gap adjusting lever 13 with respect to the first gap adjusting lever 12.

Of course, the position of the first gap adjusting lever 12 is displayed corresponding to the temperature change, and the relative position of the second gap adjusting lever 13 to the first gap adjusting lever 12 is made to correspond to the type of paper. By setting
By changing the relative position of the second gap adjusting lever 13 with respect to the first gap adjusting lever 12, gap adjustment corresponding to the type of paper is performed, and the deviation of the set value of the gap at this time due to temperature change is This can also be prevented by rotating both the gap adjusting lever 12 and the second gap adjusting lever 13 together.

In this embodiment, since the three recesses 15 are formed in the first gap adjusting lever 12, the change in the relative position of the second gap adjusting lever 13 with respect to the first gap adjusting lever 12 is as follows. It is a low temperature, a suitable temperature, and a high temperature, but is not limited to these. Also,
In order to adjust the parallelism of the carrier shaft 4 with respect to the stamp, the eccentric bearing portion 3 has been described as being rotatably provided. However, when a parallel adjusting mechanism is provided on the stamp side, the bearing is eccentric. Instead of the portion 3, a general bearing may be fixedly provided. The bearing may be a hole formed in the side plates 1 and 2.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. Seals 17, 18, and 19 are attached to the surface of the first gap adjusting lever 12 along the rotation locus at one end of the second gap adjusting lever 13. These seals 17, 18 and 19 are seals as temperature sensors that develop color in response to low temperature, normal temperature and high temperature.

Therefore, the operability can be further improved by rotating the second gap adjusting lever 13 in accordance with any one of the seals 17, 18 and 19 which reacts to the temperature change.

[0017]

According to the present invention, a carrier shaft for slidably guiding a carrier on which a print head is mounted along a print stand, and a pair of eccentric bushes fitted to both ends of the carrier shaft so as not to rotate. A bearing portion that rotatably holds these eccentric bushes, a first gap adjustment lever that is rotatably fitted to the outer periphery of one of the eccentric bushes, and a first gap adjustment lever that faces the first gap adjustment lever. A second gap adjusting lever that rotates integrally with one of the eccentric bushes, and a first gap adjusting lever that is arranged on a radius centered on the rotation axis of the second gap adjusting lever. Since it is composed of a detent formed on the surface facing the second gap adjusting lever, the first,
The second gap adjustment lever can be held in a locked state with each other by a detent and both can be rotated integrally,
As a result, the eccentric bush that rotates integrally with the second gap adjusting lever, the shaft center of the carrier shaft, and the other eccentric bush can be displaced to adjust the gap between the print head and the printing plate. By changing the detent locking position, the axial center between the eccentric bush and the carrier shaft can be displaced even if only the second gap adjusting lever is rotated without changing the position of the first gap adjusting lever. The first and second gap adjusting levers can be rotated together to perform the gap adjustment corresponding to the type of paper or the temperature change. By changing the relative position of the gap adjustment lever, the gap adjustment corresponding to the temperature change or the paper type can be performed. Having an adjustment of the gap to respond, the effects of such can be operated easily and correctly separate the absolute value of the correction of the gap due to temperature changes.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a relationship between a first gap adjusting lever and a second gap adjusting lever.

FIG. 3 is a vertical sectional side view of a line AA in FIG.

FIG. 4 is a vertical sectional side view showing a second embodiment of the present invention.

FIG. 5 is a front view.

FIG. 6 is a vertical sectional front view showing a conventional example.

FIG. 7 is a vertical cross-sectional side view of the line BB in FIG.

FIG. 8 is a vertical cross-sectional side view of a CC line portion in FIG.

[Explanation of symbols]

 3 Bearing part 4 Carrier shaft 5,6 Eccentric bush 12 First gap adjusting lever 13 Second gap adjusting lever 14 Detent

Claims (1)

[Claims] 1. A carrier shaft that slidably guides a carrier on which a print head is mounted along a printing plate, a pair of eccentric bushes fitted to both ends of the carrier shaft so as to prevent rotation, and eccentricity of these bushes. A bearing portion that rotatably holds the bush, a first gap adjustment lever that is rotatably fitted to the outer circumference of one of the eccentric bushes, and one of the first gap adjustment lever that faces the first gap adjustment lever. A second gap adjusting lever that rotates integrally with the eccentric bush, and a first gap adjusting lever and a second gap adjusting lever that are arranged on a radius centered on the rotation axis of the second gap adjusting lever. A printing gap adjusting device comprising a detent formed on a surface facing a gap adjusting lever.