JPH06255201A - Image recorder - Google Patents

Abstract

(57) [Summary] [Object] To provide an image recording apparatus having a simplified structure and capable of positioning a head and a platen roller in a compact manner. [Configuration] A platen rotatably attached to the main body side,
In a device using a head configured to removably abut the platen, a first urging unit that urges a positioning member attached to the head so as to abut the rotation shaft of the platen, A second urging means for urging the head toward the platen in a direction orthogonal to the first urging means is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer using a head such as a thermal head, and an image recording apparatus such as a copying machine or a facsimile machine for reading and recording an image.

[0002]

2. Description of the Related Art A conventional image recording apparatus of this type is, for example, as shown in FIG. 4, a fork-type downward pointing device having a structure in which a platen roller 3 and a recording head 1 such as a thermal head can be relatively separated from each other. The character-shaped positioning member 6 is engaged with the bearing 5 of the platen roller 3 to define the positions of the two, thereby ensuring the reproducibility of the positions of the two and ensuring that the heat generating line 4 of the recording head 1 and the platen roller 3 are busbars. It was configured so that and can be matched with a predetermined accuracy.

[0003]

In recent years, the image recording apparatus of this kind is required to be compact and inexpensive because of the trend of lightness, thinness, shortness, and smallness which is the trend of the times. However, in the above-mentioned positioning structure, there is a problem that the entire apparatus becomes large because the wide positioning member 6 and the like are used.

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide an image recording apparatus having a simplified structure and capable of positioning the head and the platen roller in a compact manner. is there.

[0005]

The structure according to the present invention for achieving the above object is constituted by a platen rotatably attached to a main body side and detachably abutted on the platen. In a device using a head, a first urging unit that urges a positioning member attached to the head so as to abut the rotation axis of the platen, and the head is orthogonal to the first urging unit. Second urging means for urging the platen in a certain direction.

[0006]

In the above construction, the head is urged by the first and second urging means toward the platen, so that the head can be positioned with respect to the platen without using a fork type positioning member as in the prior art. Can be performed accurately.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the apparatus according to the present invention will be concretely described with reference to the drawings. 1 to 3, the recording head 1 is urged by a platen roller 3 in a heating line 4 via a recording material 2 such as paper or a plastic sheet. Reference numeral 5 is a bearing of the platen roller 3, 6 is a positioning member, which is attached and fixed to both ends of the recording head 1 in the longitudinal direction, and as shown in FIGS. 2 is in contact with the upstream side in the transport direction.

Reference numeral 7 denotes a recording portion cover, one end of which is formed with a cutter blade 7a adjacent to the discharge port of the recording material 2, and the other end is rotatably attached to a spindle 9. 1 is configured to be rotatable in the arrow A direction. The recording head 1 has positioning members 6 attached to both ends thereof.
Also, the support shaft 8 is attached to the back surface of the cover 7 via a support shaft 8 provided on the recording cover 7, and the support shaft 8 is loosely engaged with a horizontally elongated hole 6a formed in the positioning member 6. Therefore, the head 1 is configured to be slidable in the conveyance direction of the recording material 2 along the cover 7 with the length of the laterally elongated hole 6a.

Reference numeral 10 denotes a leaf spring which is formed in a key shape on its side and is fixedly installed at a predetermined position on the back surface of the cover 7 through a screw 14, and which biases the head 1 against the platen roller 3. It constitutes one urging means and second urging means.

One end 10a of the leaf spring 10 abuts on the back surface of the head 1 to move the head 1 in the direction of arrow B in FIG.
That is, the head 1 is urged toward the center of rotation of the platen roller 3 to urge the heating line 4 toward the platen roller 3.

The other end 10b of the leaf spring 10 is the head 1
The head 1 and the positioning member 6 attached thereto are urged in the direction of arrow C, which is the direction orthogonal to the direction of arrow B, that is, in the direction of the bearing 5, by contacting the side end surface of the head 1.

Therefore, the positioning member 6 surely comes into contact with the bearing 5 on the upstream side in the conveying direction of the recording material 2, and the head 1 integral with the positioning member 6 has the bearing 5.
Positioned with respect to. This ensures the positional relationship between the heat generating line 4 and the bus bar of the platen roller 3.

In the apparatus of this embodiment, a lower guide plate 11 for guiding the recording material 2 is provided between the recording position and the cutting point so that the recording material 2 can be smoothly ejected out of the machine. I have to.

The tip of the cut recording material 2 exists near the cutter blade 7a (cutting point) provided at the discharge port, and when the next recording is started, the leading edge of the recording material is indicated by arrow D in FIG. It needs to be conveyed again in the direction and discharged smoothly out of the machine. However, the tip 2a of the recording material 2
However, as shown in FIG. 2, when curled downward, when the tip of the guide plate 11 provided for the lower guide on the discharge side is at the position 11a shown by the solid line, the tip of the recording material 2 is 2a sneaks into the plane. In order to prevent this, the guide plate 11 is extended to the upstream side of the cutting point 7a in the recording material conveying direction, for example, around 11b shown by the broken line in FIG. 2 so that the tip 2a of the recording material 2 goes into the machine. I try to prevent it.

When the gap between the tip 1a of the head 1 and the cutting point is large, in order to prevent the tip 2a of the recording material from entering the upper side, as shown in FIG. An upper guide plate 12 may be provided between the two.

In the above-described embodiment, the leaf spring 10 urges the head 1 in the directions of arrows B and C in FIG. 1 to form the first and second urging means. Spring 10
In place of the above, a tension spring 13 is used as shown in FIG. Even if the line 4 is configured to be biased by the platen roller 3, the same effect can be obtained.

[0017]

As described above, according to the present invention, the first urging means for urging the positioning member attached to the head so as to abut the rotating shaft of the platen, and the first urging of the head. Since the second biasing means for biasing the platen in the direction orthogonal to the means is provided, the head can be accurately positioned with respect to the platen, and the positioning structure is made compact to downsize the entire apparatus. It can be done.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a recording material guide.

FIG. 3 is a perspective explanatory view showing a biasing structure of a head and a platen roller.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1 ... Head 2 ... Recording Material 3 ... Platen Roller 4 ... Heat Generation Line 5 ... Bearing 6 ... Positioning Member 7 ... Cover 8, 9 ... Spindle 10 ... Leaf Spring 11, 12 ... Guide Plate 13 ... Tension Spring

Claims (1)

[Claims] 1. An image recording apparatus using a platen rotatably attached to a main body side and a head configured to removably abut the platen, wherein a positioning member attached to the head is provided. A first urging means for urging the head so as to come into contact with the rotary shaft of the platen, and a second urging means for urging the head toward the platen in a direction orthogonal to the first urging means. An image recording device provided.