JPH0437357A - Original reader - Google Patents

Abstract

PURPOSE:To place a read roller to a prescribed read position with respect to a close contact image sensor and to depress the roller onto the close contact image sensor by fitting a read roller support member supporting the read roller to a read roller positioning slot and allowing a press member of a cover to depress the read roller support member. CONSTITUTION:A shell 15b of a read roller support member 15 supporting a shaft 14a of a read roller 14 is fitted to a positioning slot 12 of a side plate 12 at usual reading, and a couple of plate members 12d is engaged with a pin 13 to block the drive of the member 15. A shaft pressing section 15c of the member 15 is directed upward to be depressed by a depression member 16. Thus, the roller 14 is positioned to the read position with respect to the close contact image sensor 11 and depresses the sensor 11 by a pressing force with the pressing member 16. An original is carried between the sensor 11 and the roller 14, in which the original is read. Since the member 15 is not turned regardless of the driven roller 14, the shaft pressing section 15c is not driven.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a document reading device used in a facsimile machine, a copying machine, etc., and more particularly to a document reading device using a contact image sensor.

2. Description of the Related Art As shown in FIG. 5, a conventional document reading device using a contact image sensor includes a reading roller 1 provided at a fixed position within the main body of the device, and a reading roller 1 provided parallel to the axis of the reading roller 1. A contact image sensor 2, a bracket 3 fixed to both ends of the contact image sensor 2, a bin 4 provided on the bracket 3, and a base 5 provided to swingably hold the bin 4. a groove 6, a leaf spring 7 disposed at both rear ends of the contact image sensor 2 to press the contact image sensor 2 against the reading roller 1, a leaf spring holding member 8 for attaching the leaf spring 7 to the base 5, etc. It was equipped with

In the document reading device with this configuration, the document is pointed at the arrow A.
It is conveyed between the reading roller 1 and the contact image sensor 2 from the direction, and is sub-scan fed by the reading roller 1, and is read by the contact image sensor 2 at the reading point B. Note that at this reading point B, the leaf spring 7 is in close contact with the image sensor 2 to prevent the document from lifting up.
is being pressed from behind.

When cleaning the reading roller 1 and the contact image sensor 2, etc., the bin 4 is moved along the groove 5, and the contact image sensor 2 is rotated in the direction of arrow C.
An operation was performed in which the contact image sensor 2 was separated from the reading roller 1.

Problems to be Solved by the Invention However, with this configuration, means for pressing the contact image sensor 2 against the reading roller 1 and means for releasing it must be provided separately, leading to an increase in the number of parts and manufacturing man-hours. was.

Also, since the reading roller 1 is fixed inside the device,
It was not easy to clean.

The above problem arises for the following reasons. That is, as a means for pressing the contact image sensor 2 against the reading roller 1,
Since a leaf spring 7 is used and the leaf spring 7 is attached to a base 5 fixed to the main body of the apparatus, a separate means must be provided to release the pressing force. In addition, the reading roller is placed below the contact image sensor, and the reading roller cannot be cleaned unless the contact image sensor is moved.
This makes cleaning etc. difficult.

Note that since the reading roller 1 is usually formed in white, it is easily soiled and needs to be cleaned more often than the contact image sensor 2. Therefore, from this point of view as well, the difficulty in cleaning the reading roller 1 is a big problem.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a document reading device with a small number of parts and manufacturing steps, and whose reading roller is easy to clean.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a side plate with a reading roller positioning groove at both ends of the contact image sensor attached to the main body of the device, and a side plate is provided in the reading roller positioning groove. , a reading roller holding member that rotatably holds both ends of the reading roller is detachably held, furthermore, a rotation stopping means is provided for preventing the reading roller holding member from rotating with respect to the side plate; A lid portion that can be opened and closed is provided to cover the image forming apparatus, and a pressing member that presses the reading roller holding member when the lid portion is closed is provided on the lid portion.

Operation According to the above-described structure, during normal reading, the reading roller holding member holding the reading roller fits into the reading roller positioning groove, and the pressing member of the lid presses the reading roller holding member. This allows the bar reading roller to be positioned at a predetermined reading position relative to the contact image sensor and to be pressed against the contact image sensor. At this time, since the rotation stopper stops the rotation of the reading roller holding member, the pressing force exerted by the suppressing member does not fluctuate, and wear of the reading roller holding member and the side plate is prevented. When cleaning, by opening the lid, the pressure on the reading roller holding member is automatically released, so the reading roller holding member can be easily removed from the reading roller positioning groove, and the reading roller can be removed from the contact image sensor. They can be separated and both can be easily cleaned. In particular, since the reading roller is disposed on the side closer to the lid, cleaning is easy. Furthermore, as a result of attaching the pressing member to the lid, there is no need to provide a separate means for releasing the pressure on the reading roller, and the number of parts is reduced.

Embodiment FIG. 1 is a sectional view of a main part of a document reading apparatus according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof.

In FIGS. 1 and 2, 11 is a contact image sensor;
Reference numeral 12 denotes side plates fixed to both ends thereof. By attaching the side plates 12 to the main body of the apparatus (not shown), the contact image sensor 11 is fixed at a predetermined position within the main body of the apparatus. The side plate 12 has a reading roller positioning groove 12a and a shelf 12b adjacent thereto. Reference numeral 13 denotes a bottle attached to the side plate 12 near the reading roller positioning groove 12a and the shelf portion 12b. 14 is a reading roller attached to be pressed against the contact image sensor 11, and 15 is a reading roller holding member that rotatably holds the reading roller 14. This reading roller holding member 15 is shown in FIGS.
As shown in the figure, the shaft 14a of the reading roller (see Figure 2)
A cylindrical body portion 15b having a bearing hole 15a for rotatably holding the body, a fan-shaped shaft pressing portion 15c formed at one end of the body portion 15b, and a pair of shaft pressing portions 15c extending in a direction perpendicular to the axis of the bearing hole 15a. It consists of a plate-like member 15d. The body portion 15b is formed to have an outer diameter that fits into the positioning groove 12a formed in the side plate 12.
2a, the reading roller 14 can be positioned at a predetermined reading position with respect to the contact image sensor 11. In addition, a shelf 12 formed on the side plate 11
b is made in a shape on which the shelf portion 15b can be placed. A pair of plate members 15 of the reading roller holding member 15
d has a pin 13 sandwiched between them, and is configured to be able to move linearly and rotate relative to the pin 13. By engaging with the pin 13, the reading roller holding member 15 rotation can be prevented. Therefore, the pair of plate-like members 15d and the pin 13 constitute a rotation stopper that prevents the reading roller holding member 15 from rotating relative to the side plate 12. Shaft pressing portion 15c and pair of plate-like members 1
As shown in FIG. 1, the mounting angle 5d is such that when the body portion 16b is fitted into a predetermined position in the positioning groove 12a and the plate member 15d is engaged with the pin 13, the shaft pressing portion 15c
is set so that it extends almost upward. Reference numeral 16 denotes a suppressing member attached to a lid part (not shown) that can be opened and closed with respect to the main body of the apparatus, and when the lid part is closed, the shaft pressing part 15
It is provided in a position where it can press c. This pressing member 1
6 is composed of, for example, a leaf spring, and elastically presses the shaft pressing portion 15c.

The operation of the document reading device configured as described above will be explained below with reference to FIGS. 1, 4(a) and 4(b). Note that FIGS. 4(a) and 4(b) are cross-sectional views of the document reading device taken near the side plate 12 and viewed in the direction of the side plate.

During normal reading, as shown in FIGS. 1 and 4(a), the body 15b of the reading roller holding member 15 that holds the shaft 14a of the reading roller 14 fits into the positioning groove 12a of the side plate 12. The pair of plate members 12d engage with the pin 13 to prevent the reading roller holding member 15 from rotating.

At that time, the shaft pressing portion 15 of the reading roller holding member]5
C faces upward, and its upper end is pressed by a pressing member 16 provided on the lid.

As a result, the reading roller 14 is connected to the contact image sensor 11.
The contact image sensor 11 is positioned at a predetermined reading position and is pressed against the contact image sensor 11 by the pressing force of the pressing member 16 . In this state, the document is conveyed between the contact image sensor 11 and the reading roller I4,
A read is made. At this time, even if the reading roller 14 rotates, the reading roller holding member 15 does not rotate, so the shaft pressing part 15c does not rotate. The applied pressing force does not change.

On the other hand, when cleaning the reading roller 14 and the like, first open the lid. Then, the reading roller 14 is exposed, and the pressing member 16 that has been pressing the shaft pressing portion 15c of the reading roller holding member 15 moves together with the lid portion, and the suppression of the reading roller holding member 15 is released. Next, the body 15b of the reading roller holding member 15 is moved to the shelf 12b of the side plate 2. This movement is performed by rotating the pair of plate members 14d relative to the pin 13, as shown in FIG. 4(b). By moving the reading roller holding member 15 to the shelf 2b while holding the reading roller 14 in this manner, the reading roller 14 is separated from the contact image sensor 11, so that cleaning can be easily performed. The reading roller 1 is located above the contact image sensor 11 on the side closer to the lid, so it is easy to approach, and the reading roller 14, which is frequently cleaned, can be cleaned very easily.

After cleaning is completed, the reading roller holding member 15 may be returned to the original positioning groove 12a with the pair of plate members 14d engaged with the pins 13, and the lid portion may be closed. As a result, the reading roller holding member 15 enters the state shown in FIG. 1, and the suppressing member 16 of the lid portion automatically presses the shaft pressing portion 15c of the reading roller holding member 15.

Effects of the Invention As is clear from the above description, the present invention provides a side plate provided with a reading roller positioning groove at both ends of a contact image sensor, and holds both ends of the reading roller rotatably in the reading roller positioning groove. The reading roller holding member is removably held, and the lid part that can be opened and closed to cover the reading roller is further provided with a pressing member that presses the reading roller holding member when the lid part is closed. Therefore, during normal reading, by fitting the reading roller holding member that holds the reading roller into the reading roller positioning groove and pressing the reading roller holding member with the pressing member on the lid, the reading roller is brought into close contact with the image sensor. It can be positioned and held at a predetermined reading position, and when cleaning, by opening the lid, the pressure on the reading roller holding member can be automatically released. By removing the reading roller from the positioning groove, it becomes possible to separate the reading roller from the closely attached image sensor and clean both of them easily.Furthermore, as a result of attaching the suppressing member to the lid, there is a means for releasing the suppression of the reading roller. This eliminates the need to provide a separate component, which has the effect of reducing the number of parts and manufacturing man-hours.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of a document reading device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a side view of a reading roller holding member, and FIGS. b) explains the movement of the reading roller holding member, and is a cross-sectional view of the document reading device taken near the side plate 12 and viewed in the direction of the side plate, and FIG. 5 is a cross-sectional view of the main parts of the conventional document reading device. It is. 11... Close contact image sensor, 12 side plate, 12a.
...reading roller positioning groove, 12b...shelf section, 13.
...Pin, 14...Reading roller, 14a...Axis, 1
5... Reading roller holding member, 15a... Bearing hole, 1
5b...Body part, 15c...Shaft pressing part, 15d...
A pair of plate-like members, 16... suppressing member. Name of agent Patent attorney Shigetaka Awano and 1 other person 1 Figure 11 Contact image sensor 12, side plate 12a, reading roller positioning groove 12b, shelf 16, pin 14, reading roller 15, reading roller holding member 15b, body 15c, shaft pressing Part 15d - Plate member 16 Pressing member Fig. 2 Fig. 5C 5a Fig. (a) 5b 2a 2b

Claims (1)

[Claims] A device main body, a contact image sensor having side plates at both ends and attached to the device main body, a reading roller holding groove formed in the side plate, a reading roller disposed opposite to the contact image sensor, and the reading roller. a reading roller holding member that rotatably holds both ends of the roller and is removably held in the reading roller holding groove; a rotation stopper that stops rotation of the reading roller holding member with respect to a side plate; and a rotation stopper that covers the reading roller. a lid portion that can be opened and closed with respect to the apparatus main body; and a pressing member provided on the lid portion that presses the reading roller holding member when the lid portion is closed and presses the reading roller against the contact image sensor. A document reading device having: