JPH0289467A - Original reader - Google Patents

Abstract

PURPOSE:To attain smooth carriage movement and reading with high resolution by forming a placing face of an original platen and a guide recessed part for carriage movement with an integrated rail. CONSTITUTION:The original placing plate 3 is fixed to a placing face 2b of a rail 21, a roller 6 turnable around a shaft implanted to a carriage 1 and arranged to a carriage moving guide slot 2a of the rail 21. The roller 6 is energized to a rail support 6a by a dish spring 7. The movement of the carriage 1 in the direction of the arrow B is restricted by the energizing force. Through the simple constitution above, the smooth movement of the carriage is obtained, an original is read with higher resolution and maintenance/assembly is facilitat ed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the configuration of a document reading device, and will be described in more detail◆
Regarding the carriage movement structure.

[Conventional technology]

FIG. 6 is a perspective view of the main parts of a conventional document reading device. In FIG. 6, a carriage 101 equipped with an optical system for forming an image of a document has both ends fixed to a main body 105, and a fixed guide shaft 102. Drive along the axis in the direction of arrow A (not shown),
It is movably held by moving means. A transparent original platen 103 is fixed to a part of the main body 105,
The reading surface of the original 104 is set on the original mounting table surface 103a, and the carriage 101 reads the original 104 while moving in the direction of arrow A. At this time, generally, as the reading resolution increases, the imaging system of the optical system increases. Distance accuracy, that is, focus accuracy becomes stricter, and although not shown, the parallelism between the optical sensor surface disposed in the carriage 101 and the document mounting table surface 103a and the focus accuracy become important. However, the fixed position of the guide shaft 102, which pivotally supports the carriage 101, and the fixed position of the original platen 103 are completely different from each other.

[Problem to be solved by the invention]

However, in the configuration of a conventional document reading device, the document surface 1
03a and the carriage 101 carrying the optical system is determined by the arrangement precision of the main body 105 between the guide shaft 102 and the original platen 103. Since it is arranged separately from the receiving surface of the stand 103, it is difficult to obtain the above-mentioned focus accuracy, and this has a big impact on performance, as there is a recent technological trend toward higher reading resolution. I had an issue.

Furthermore, when inspecting or adjusting the optical system contained in the carriage 101, it is necessary to remove the guide shaft 102 from the main body 105, which causes problems such as poor maintainability of the carriage 101 and poor assembly efficiency. Was.

Therefore, in order to solve these conventional problems, the present invention improves the focusing accuracy between the document receiving surface and the optical sensor surface included in the carriage to support higher resolution reading, and at the same time improves the maintainability of the carriage. It is an object of the present invention to provide a document reading device that is easy to assemble.

(Means for solving a'J!l!) In order to solve the above problems, the document reading device of the present invention includes a carriage equipped with an optical system that forms an image of the document to be read on a photoelectric conversion element; A document reading device comprising means for moving the carriage along the document, and a main body in which the means is disposed, which includes a receiving surface for a document platform, and the carriage is moved in the longitudinal direction, that is, in the direction of movement of the carriage. It is characterized in that the part that guides the movement is formed of an integral member.It is also characterized in that the cross section of the part is formed in a concave shape.

[Effect]

According to the document reading device of the present invention configured as described above, the distance between the document receiving surface and the carriage on which the optical system is mounted during document reading, that is, the focus accuracy is improved, so that high resolution reading is possible. . Furthermore, since the carriage can be easily attached and detached, maintenance such as inspection and adjustment of the optical system is improved.

〔Example〕

An embodiment of the present invention will be described below based on the drawings. 1 and 2 are sectional views of main parts of the carriage moving structure of the document reading device of the present invention. In FIG.
The roller 6 is fixed to the original plate receiving surface 2b of the rail 21, and is rotatably attached to a shaft embedded in the carriage l.
Place it at a. The spring 7 urges the roller 6 toward the main body rail support portion 5a. This biasing force restrains the movement of the carriage 1 in the direction of arrow B. Figure 2 is a diagram showing the other end of the carriage 1 shown in Figure 1.
In the figure, the roller 6, which is rotatably attached to a shaft embedded in the carriage 1, is not biased by a counter spring as shown in FIG. 1, and is configured to hold the carriage 1 in a movable state in the direction of arrow C. . In this state, although not shown in the drawings, the carriage 1 reads the document while moving in the vertical direction of the drawing by means of a carriage moving means.

Now, the concave portion 2a of the rail 21 and the roller 6 are arranged on their respective slopes to move the carriage 1 in the direction of arrow B in FIG.
The position of the carriage is determined, which means that there is no meandering when the carriage moves, and good carriage drive can be obtained. Moreover, even if there is a slight deviation in the positional relationship between the rail 21 shown in FIG. 1 and the rail 22 shown in FIG. and the four parts 2a are integrated, so that the original surface and the carriage 1
Focus accuracy can be ensured without losing focus.

Furthermore, the carriage 1 can be moved without wrinkling by the movable roller 6 in the direction of arrow C shown in FIG. Furthermore, the straightness of the rail 21.22 in the longitudinal direction, the shape accuracy of the four parts 2a, and the parallelism between the recess 2a and the original plate receiving surface 2b are determined by molding the rail 21.22 with an aluminum mold extruder. High accuracy can be guaranteed by this configuration.

FIG. 3 is a diagram of the rail fixing and supporting structure of the present invention. In FIG. 3, the rail 21 is fitted into a rail support portion 5a that stands up from the main body 5. The upper case 8 has a structure in which it is fixed to the main body while enclosing a carriage and the like using screws or the like. When the upper case 8 is removed in the direction of the arrow E, the ends of the rails 21 become open, and in this state, the above-mentioned carriage can be attached from the direction of the arrow. Furthermore, since the carriage can be easily removed by reversing this procedure, maintenance of the optical system can be easily performed and ease of assembly can be improved.

4 and 5 are views showing other specific examples of the present invention. In FIG. 4, the portion 3a that guides carriage movement is formed into a convex shape, and the roller 61 is made to follow the shape of the convex portion 3a. The same effect as described above can also be obtained. Further, the roller 61 is rotatably attached to a shaft installed in the carriage 1, but even if it becomes unable to rotate, as long as the roller 61 and the convex portion 3a are in a slidable state, the function will be improved. There is no problem with this, and exactly the same effect can be obtained. FIG. 5 shows a configuration in which the rollers described above are configured to function as wheels. In FIG. 5, the rollers 62 are rotatably attached to both ends of the carriage 11 as described above. The carriage 11 is biased by the elasticity of a compression spring 71 at one end of the carriage 11 via the roller 62 toward the reference rail 32 in the direction of arrow F. Further, the same effect can be obtained even if the above-mentioned rail is constructed from a sheet metal stamping material such as a thin plate.

In the embodiments described above, by configuring the original plate receiving surface and the guide recess for carriage movement as an integral member, and by attaching the integral member to the main body in an open state, smooth carriage movement can be obtained. The focus accuracy is increased, which is effective for high-resolution reading, and also has an effective effect on the maintainability of the optical system.

〔Effect of the invention〕

As explained above, according to the configuration of the present invention, a high-resolution document reading device can be obtained with a simple structure in which the document tray receiving surface and the guide recess for carriage movement are configured with an integrated rail. . It also has excellent assembly and maintainability, and has the effect of being able to respond to lower costs.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of main parts of a carriage moving structure of a document reading device according to the present invention, FIG. 3 is a diagram of a rail fixing support structure according to the present invention, and FIGS. 4 and 5 are views according to the present invention. FIG. 6 is a perspective view of a main part of a conventional document reading device. 1...Carriage 21.22...Rail 3...Document platform 5a...Rail support section 6...Roller and above Applicant Seiko Epson Co., Ltd. agent Patent attorney Kizobe Suzuki and 1 other person b 6 1st Figure 7, ° flat, ridge" 3, ゛At the cool turret banquet 5a゛[-le scanty details H hanging 6X roller 7, ° dimension Uba year 27: L-rule 7, °Mo, S1.Shi5a, 'L-le branch PI! Cup 6, °Roller 22, Rule 7,' 27゛Rail Figure 6

Claims (2)

[Claims] (1) A document reading device comprising a carriage equipped with an optical system that forms an image of the document to be read on a photoelectric conversion element, means for moving the carriage along the document, and a main body in which the means is disposed. 1. A document reading device according to claim 1, wherein a receiving surface for a document mounting table and a portion for guiding movement of the carriage in the longitudinal direction thereof, that is, in the direction of movement of the carriage, are constructed as an integral member. (2) Claim 1 characterized in that a cross section of a portion that guides the movement of the carriage disposed on the member is configured to have a concave shape.
Manuscript reading device as described.