JPS61137757A - Image recording apparatus - Google Patents

Abstract

PURPOSE:To attain to make the title apparatus compact and inexpensive, by using a common press means not only in the press energizing of a recording head to a platen but also that of a locating member to the platen or the member coaxial to said platen. CONSTITUTION:The end part of a recording part cover 7 is pivotally mounted to a pivot shaft 9 in a freely revolvable manner. Locating members 6 are mounted to both ends of a recording head 1 and loosely fitted to the back surface of the cover 7 by a pivot shaft 8 through a traverse slot 6a so as to be slid to the flow direction of a recording material 12. A leaf spring 10 is fixedly provided to the backappa surface of the cover 7 and one end part 10a thereof is contacted with the back surface of the head 1 to be energized to the direction of a platen roller 3 and the other end part 10b thereof is contacted with the side end surface of the head to energize the head 1 and the coating members 6 to the direction of a bearing 5. Because not only the pressing of the recording material to the recording head and the platen roller in the upstream side of the feed direction of said recording material 2 but also the location and energizing of the recording head in the paper feed direction are performed by using one pressing force means, an image recording apparatus can be made light and compact.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to facsimiles, printers, etc. that record images using a recording head such as a thermal head or an electrostatic recording head.
The present invention relates to image recording devices such as copying machines.

<Prior Art> In conventional image recording apparatuses of this kind, for example, a fork-type device having a structure in which a platen roller 3 and a recording head 1 such as a thermal head are relatively separated as shown in FIG. The downward U-shaped positioning members 6 provided at both ends of the head 1 are engaged with the bearings 5 of the platen roller 3, thereby ensuring reproducibility of the positions of both, and aligning the heating line 4 of the recording head 1 with the platen. Although this fork-type device was configured to be able to match the generatrix of the roller 3 with a certain degree of precision, it had the disadvantage that the total Wiff became large due to the use of a medium-wide positioning member 6 and the like.

<Problems to be Solved by the Invention> The device according to the present invention relates to a completely new technology that fundamentally improves the drawbacks of conventional devices.

In particular, in recent years, this type of image recording device has become more compact and less expensive due to the trend of the times, and there has been a great demand for making the device more compact and inexpensive. This is a completely new technology developed to achieve this goal.

Means for Solving the Problems〉 To specifically explain one embodiment of the apparatus according to the present invention, in FIGS. The recording material 3 is a platen roller that contacts the head I through the recording material 2 at a heat generation line 4. 5 is a bearing for the roller 3, and 6 is a positioning member that is attached and fixed to both ends of the head l.As is clear from the figure, the recording material 2 is mounted on the bearing 5.
are in contact with each other on the upstream side in the conveyance direction. Reference numeral 7 denotes a recording unit cover, one end of which forms a cutter blade 7a adjacent to the discharge port of the recording material 2, and the other end of which is rotatably attached to a support shaft 9 and extends in the direction of arrow A. It is configured to be rotatable. The recording head l is mounted on the back surface of the cover 7 via positioning members 6 attached to both ends thereof and a support shaft 8 provided on the cover 7, and the support shaft 8 is inserted into the positioning member 6. It is loosely mated with the horizontally long hole 6a provided therein.

Therefore, the head l is the hole length of this oblong hole 6a, and the cover 7
It is configured to be able to slide along the flow direction of the recording material 2. Reference numeral 10 denotes a temporary spring whose side part is shaped like a key, and is fixed at a predetermined position on the back surface of the cover 7 via a screw 14, and its one end lOa abuts against the back surface of the head l to hold it. It urges the head I in the direction of arrow B, that is, in the direction of the platen roller 3, and the other end 10b comes into contact with the side end surface of the head 1, thereby pushing the head I and the positioning member 6 attached thereto in the direction of arrow C, that is, in the direction of the bearing 5. It is energizing.

Therefore, the positioning member 6 and the recording head l are integrally brought into contact with the bearing 5 on the upstream side in the conveyance direction of the recording material 2, thereby ensuring the positional relationship between the heat generation line 4 and the generatrix of the platen roller 3. There is.

In the figure, 11 is a lower guide, and 12 is an upper guide.

In the present invention, as described above, the recording drive 1 is slidably mounted on the back surface of the cover 7 via the positioning member 6 and the support shaft 8, and the positioning member 6 is mounted on the platen roller 3.
The head 1 and the positioning member 6 are configured to urge the platen roller 3 and the bearing 5, respectively, by one temporary spring IO which is in contact with the upstream side of the bearing 5 and further fixed to the back surface of the cover 7. Therefore, the positional relationship between the heat generation line 4 and the generatrix of the platen roller 3 can always be guaranteed.

Further, the platen roller 3 rotates counterclockwise to convey the recording material 2, and at this time, the recording head 1 receives force in the direction of the arrow through the recording material 2, so the positioning member 6 is attached to the bearing 5. Therefore, the feeding of the recording material 2 can be made smooth, and generation of vibration and vibrational deviation of the printing point due to vibration can be prevented.

<Example> In the above example, one temporary spring lO was used to urge the recording head l and the positioning member 6 against the platen roller 3 and the bearing 5, respectively. By pulling the positioning member 6 in the direction of arrow E using a tension spring 13 constituted by one coiled spring, the positioning member 6 is attached to the platen roller 3 and the bearing 5, respectively. It is also possible to configure it in multiple ways.

<Effects of the Invention> As described above, the apparatus according to the present invention positions the recording head and platen roller only on the upstream side of the recording material feed, instead of using a fork-type device that uses a downward U-shaped positioning member. The distance from the point to the recording material outlet can be significantly shortened, and the single pressing means can be used both to press the recording head against the platen roller and to bias the positioning in the paper feeding direction. The overall structure of the image recording apparatus can be simplified and made compact, and therefore the image recording apparatus can be made light and compact as a whole, and can be mass-produced at low cost.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of the present invention, FIG. 2 is a diagram illustrating a recording material guide, FIG. 3 is a perspective view of a main part, and FIG. 4 is a diagram illustrating a conventional apparatus. 1 is a recording head, 2 is a recording material, 3 is a platen roller, 4
1 is a heat generation line, 5 is a bearing, 6 is a positioning member, 7 is a cover, 8 and 9 are support shafts, 10.13 is a pressing means of 1', and 11.12 is a temporary guide. Patent Applicant Canon Co., Ltd. Agent Patent Attorney Shukichi Nakagawa Figure 2

Claims (1)

[Claims] In an image recording device comprising a combination of a platen rotatably provided on the main body side and a recording head configured to detachably abut the platen, a positioning device integrally provided with the recording head; The member is configured to abut on the platen or a member coaxial with the platen on the upstream side in the recording material feeding direction, and the member is configured to press the recording head against the platen and the positioning member on the platen or coaxial with the platen. 1. An image recording apparatus characterized in that a common pressing means is used to press and bias a shaped member.