JPH05188688A - Original reader - Google Patents

Abstract

PURPOSE:To suppress the ingress of dust, etc., into a device to the utmost. CONSTITUTION:An original insertion opening 3 is always closed by an opening/ closing member 14. When an original 6 is read, the original insertion opening 3 is opened by operating the opening/closing member 14, and the member 14 is fastened to the prescribed opening position by a locking means 21. After the reading of the original 6 is finished, a carrying roller 1 is rotated in the opposite direction to the direction in which the original is carried, and the fastening of the opening/closing member 14 is released to automatically move the member 14 to the closing position. The speed for moving the opening/closing member 14 is made low by a buffer means 18, thereby ensuring safety at the time of closing the original insertion opening 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading device such as a laser printer or a facsimile, and more particularly to dust prevention in the device.

[0002]

2. Description of the Related Art A document reading apparatus such as a facsimile is shown in FIG.
As shown in the configuration diagram of FIG. 1, the transport roller 1, the document reading unit 2 and the like are housed in an exterior cover 5 having a document insertion port 3 and a document ejection port 4. When reading the original 6, the original 6 is inserted through the original insertion port 3 and the contact glass 7
And to the contact surface of the carrier roller 1. When the document 6 is inserted, the document detection sensor 8 provided between the document insertion port 3 and the contact glass 7 detects the insertion of the document 6. When the operator issues a reading instruction in this state, the transport motor 9 rotates and the gear 1 attached to the transport motor 9 is rotated.
0, a gear group 11, and a gear 12 attached to the carrier roller 1.
The rotation is transmitted to the transport roller 1 by, and the transport roller 1 is rotated in the direction of arrow A. The document 6 is transported while being pressed against the contact glass 7 by the rotation of the transport roller 1. In synchronization with the rotation of the transport roller 1, the document 6 is read by the document reading unit 2 including a photoelectric conversion element such as a CCD. The read document 6 is discharged from the document discharge port 4. When the document detection sensor 8 detects that the document 6 is not present when the trailing edge of the document 6 passes through the document reading unit 2, the reading is completed.

In the document reading apparatus constructed as described above, the document insertion port 3 and the document ejection port 4 provided on the exterior cover 5 are usually left open, but the document insertion port 3 and There is also a device in which an opening / closing cover 13 is provided at the document discharge port 4 and the document insertion port 3 and the document discharge port 4 are closed by manually operating the opening / closing cover 13 when the document is not read.

Further, as disclosed in Japanese Utility Model Laid-Open No. 2-21961, there is a facsimile machine in which a dustproof cover is provided at the recording paper discharge port and the recording paper discharge port is closed by the dustproof cover when not receiving.

[0005]

As described above, in the apparatus in which the document insertion opening 3 and the document ejection opening 4 have no opening / closing covers and the document insertion opening 3 and the document ejection opening 4 are always left open. Dust, foreign matter, and the like enter the inside of the apparatus from the outside through the document insertion port 3 and the document ejection port 4, and adhere to the transport roller 1 and the contact glass 7 to be soiled. Therefore, the original 6
However, unlike the case where the coefficient of friction between the document 6 and the conveyance roller 1 or between the document 6 and the contact glass 7 is normal, there is a problem that the document cannot be conveyed normally.

[0006] Further, due to foreign matter or the like that has entered inside,
There is also a serious drawback in that it damages the lens 1 and the contact glass 7 and shortens the life of the device.

[0007] These disadvantages are provided with an opening / closing cover at the document insertion port 3 and the document ejection port 4, and when the document is not read, the opening / closing cover is operated to close the document insertion port 3 and the document ejection port 4. Although it can be solved by the device, since the operator manually operates the opening / closing cover, the operation of the opening / closing cover is not always performed, and even in this case, it cannot be said that the above problem is definitely solved. There wasn't.

A dustproof cover is provided at the recording paper discharge port,
Even if the recording paper discharge port is closed with a dust-proof cover during non-reception, the above-mentioned problem is surely solved if the document insertion port, which is at the top of the device and contains the largest amount of dust, is open. It didn't happen.

In particular, since the document reading apparatus is often used even in a general home where there is relatively much dust and the like,
Opportunities for the above problems are increasing.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an original reading apparatus capable of suppressing dust and the like entering the apparatus as much as possible.

[0011]

An original reading device according to the present invention has a conveying roller, an opening / closing member, a buffering means, a locking means, and a rotation control means, and the conveying roller reads an original from an original reading section. It is conveyed in pressure contact with, and is housed in an exterior cover having a document insertion port and a document ejection port, and an opening / closing member opens and closes the document insertion port or both the document insertion port and the document ejection port. It is slidably attached to the exterior cover,
It has a locking portion for locking the open position and a knob protruding to the outside of the exterior cover, and is constantly urged in a direction to close the document insertion port and the document ejection port, and the buffering means limits the moving speed of the opening / closing member. The locking means is for fixing the opening / closing member to the open position, and has a locking portion of the opening / closing member at one end. A rotatable clamp arm that has a locking claw that engages, a spring that biases the locking claw of the clamp arm toward the opening / closing member opening, and a clamp arm that rotates by reversing the transport roller. The rotation control means changes the rotation direction of the feeding roller, and has a cam for releasing the engagement between the locking claw and the locking portion of the opening / closing member. Low
It is characterized in that the roller is rotated in the direction opposite to the document conveying direction.

Further, it is preferable that the rotation control means reverses the rotation of the conveying roller after a lapse of a predetermined time after detecting the completion of reading the original.

[0013]

In the present invention, the document insertion port and the document ejection port are always closed by the opening / closing member. When reading a document, the opening / closing member is operated to open the document insertion port and the document discharging port, and the opening / closing member is fixed to a predetermined opening position by the locking means. A document is inserted from the opened document insertion port, conveyed by a conveyance roller, read, and ejected from the document ejection port. After the reading of the document is completed, the transport roller is rotated in the direction opposite to the document transport direction to release the fixing of the opening / closing member and automatically move the opening / closing member to the closed position. The speed at which the opening / closing member moves is reduced by the buffering means to ensure safety when closing the document insertion port and the document ejection port.

Further, the rotation control means reverses the rotation of the conveying roller after a lapse of a fixed time after the reading of the original is completed, and the original is pinched by the opening / closing member when the original insertion port and the original discharge port are closed. Prevent getting stuck.

[0015]

1 is a block diagram showing an embodiment of the present invention. As shown in the figure, the transport roller 1, the document reading section 2, etc. are housed in an exterior cover 5 having a document insertion port 3 and a document ejection port 4. An opening / closing member 14 is attached to the exterior cover 5 near the document insertion port 3. As shown in the detailed view of FIG. 2, the opening / closing member 14 includes a parallel upper plate 14a and a parallel lower plate 14a.
The upper cover 14a and the lower cover 14b sandwich the outer cover 5 so that the outer cover 5 can be moved along with the outer cover 5. The upper plate 14a is provided with a knob 15, and the lower plate 14b is provided with a locking portion 16 for locking. The opening / closing member 14 is constantly urged in the direction of arrow C by the spring 17 to close the document insertion port 3. Further, the cushioning means 18 is pressed against the lower plate 14b. As shown in the sectional view of FIG. 3, the cushioning means 18 comprises a cushioning body 20 housed in a holder 19 and having a certain frictional resistance value such as urethane, rubber, cork, and soft resin.

Locking means 21 is provided below the opening / closing member 14. The locking means 21 is a clamp arm 22.
And a spring 23 and a cam 24. Clumper
The hole 22 has a locking claw 22a at one end that engages with the locking portion 16 of the opening / closing member 14, and is rotatable about a rotation fulcrum 25.
Is biased in the opening direction. In addition, 26 is a clamper
It is a stopper for the frame 22.

The cam 24 is provided on the side surface of the gear 12 attached to the conveyor roller 1, and has an end 24a protruding at a constant angle α with respect to the radial line of the gear 12, and an end 24a.
Is composed of an inclined surface 24b having a gentle inclination with respect to the document feeding direction A of the transport roller 1. The gear 12 to which the cam 24 is attached is the gear 1 attached to the transport motor 9.
It rotates by 0 and the gear group 11.

When using the document reading apparatus constructed as described above, first, the operator manually operates the knob 15 of the opening / closing member 14 to move it in the direction of arrow D to open the document insertion port 3. .. When the opening / closing member 14 is moved in the direction of the arrow D, the locking claw 22a of the clamp arm 22 engages with the locking portion 16 of the opening / closing member 14 to fix the opening / closing member 14 at the open position of the document insertion opening 3, Allows reading. When the document 6 is inserted from the document insertion port 3 in this state, the insertion of the document 6 is detected by the document detection sensor 8 provided between the document insertion port 3 and the contact glass 7. When the operator issues a reading instruction in this state, the transport motor 9 rotates and the transport motor 9 is rotated.
Rotation is transmitted to the transport roller 1 by the gear 10 and the gear group 11 attached to the rotor 9 and the gear 12 attached to the transport roller 1, and the transport roller 1 is rotated in the direction of arrow A. The document 6 is transported while being pressed against the contact glass 7 by the rotation of the transport roller 1. The document 6 is read by the document reading unit 2 in synchronization with the rotation of the transport roller 1, and the read document 6 is read.
Is discharged from the document discharge port 4. When the document 6 is conveyed, the cam 24, to which the gear 12 rotating in the direction of arrow A is attached, abuts on the tip end of the clamp arm 22. However, since the direction of the cam 24 is a gently sloping surface 24a, it is smooth. Rotate to. There is some resistance when the tip of the clamp arm 22 gets over the cam 24,
Since the force works in the direction of pushing up the clamp arm 22, the opening / closing member 14 can be rotated without unlocking.

The original 6 is read in this way, and even if a predetermined time has elapsed after the original detection sensor 8 detected that the rear end of the original 6 has passed, the original detection sensor 8
When the next original 6 is not detected, it is considered that the original reading has been completed, and the conveyance motor 9 is rotated in the reverse direction from the original conveying direction. By the reverse rotation of the transport motor 9, the gear 12 attached to the transport roller 1 rotates in the direction of the arrow B, the protruding end 24a of the cam 24 contacts the tip of the clamp arm 22, and the clamp arm 22. Rotate counterclockwise. The rotation of the clamp arm 22 releases the engagement between the locking claw 22a and the locking portion 16 of the opening / closing member 14, and the opening / closing member 14
Is moved toward the document insertion port 3 by the pulling force of the spring 17 to close the document insertion port 3.

If the opening / closing member 14 moves rapidly when closing the document insertion opening 3, there is a risk that the operator's finger or the like may be caught. In order to prevent this danger, the movement speed of the opening / closing member 14 is suppressed by the buffer means 18 to ensure safety. In addition, the buffer body 20 of the buffer means 18 is shown in FIG.
5 may be provided above and below the lower plate 14b of the opening / closing member 14, or may be roll-shaped as shown in FIG. further,
The cushioning means 18 may be formed by an oil damper or the like.

When the moving speed of the opening / closing member 14 is suppressed by the buffer means 18 as described above, the opening / closing member 14 slowly moves when closing the document insertion opening 3, so that the opening / closing member 14 is closed.
The original 6 may be mistakenly inserted from the original insertion port 3 during the movement of the original 6, and the original 6 may be damaged. Therefore, as shown in FIG. 6, position detecting sensors 29a and 29b are provided at both moving end portions of the opening / closing member 14, respectively.
When the position detection sensor 29b detects that the document has moved from the position where the document insertion opening 3 is opened, the control unit 30 causes the display unit 3 to move.
If the reading prohibition is displayed at 1, and the position detection sensor 29a detects that the opening / closing member 14 completely closes the document insertion opening 3, if the document insertion opening is displayed on the display unit 31, the document 6 is damaged. It is possible to more reliably prevent the operator from pinching the finger, and it is possible to confirm the closing of the document insertion opening 3.

In this way, the document insertion port 3 is opened when the document 6 is read, and when the reading of the document 6 is completed, the document insertion port 3 where dust and the like are most likely to enter is automatically closed. It is possible to significantly reduce the amount of dust and the like entering the device.

Although the above embodiment has been described with reference to the case where the opening / closing member 14 is provided in the document insertion port 3, the document insertion port 3
The opening / closing member 14 may be provided on both the document discharge port 4 and the document discharge port 4.
In this case, when the document insertion port 3 and the document ejection port 4 are close to each other, the locking means 21 and the like can be simplified by integrating the opening / closing member for opening and closing the document insertion port 3 and the document ejection port 4. ..

In the above-described embodiment, the case where the knob 15 of the opening / closing member 14 is manually operated to open the document insertion opening 3 when the document 6 is read has been described.
The opening / closing member driving means may be attached to the knob 15 and the opening / closing member driving means may be driven by a reading start signal or a reception signal to automatically move the opening / closing member 14 to open the document insertion opening 3.

[0025]

As described above, according to the present invention, the document insertion port and the document ejection port are always closed by the opening / closing member, and when the document is read, the opening / closing member is operated to operate the document insertion port and the document ejection port. After opening the outlet and fixing the opening / closing member to the specified opening position, after the scanning of the original is completed, the feeding roller is rotated in the opposite direction to the original feeding direction to release the fixing of the opening / closing member and automatically. Since the document insertion port and document ejection port are closed, it is possible to greatly reduce dust and other particles entering the device.
It is possible to obtain a high quality read image and prevent the life of the device from being shortened due to dust or the like.

Further, by reducing the moving speed when closing the document insertion port or the document ejection port by the opening / closing member by the buffer means, it is possible to secure the safety when closing the document insertion port or the document ejection port.

Further, after the reading of the document is completed and a predetermined time has passed, the rotation of the conveying roller is reversed to close the document insertion port and the document ejection port, thereby preventing the document from being caught and damaged. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is a perspective view showing details of a main part of the embodiment.

FIG. 3 is a cross-sectional view showing a buffer means.

FIG. 4 is a cross-sectional view showing another cushioning means.

FIG. 5 is a cross-sectional view showing another cushioning means.

FIG. 6 is a layout view of a position detection sensor.

FIG. 7 is a sectional view showing a configuration of a conventional example.

[Explanation of symbols]

 1 Conveyor Roller 2 Original Reading Portion 3 Original Inserting Port 4 Original Ejecting Port 5 Exterior Cover 14 Opening / Closing Member 15 Knob 16 Locking Part 17 Spring 18 Buffering Means 21 Locking Means 22 Clamping Arm 23 Spring 24 Cam

Claims (2)

[Claims] 1. An original reading apparatus having a conveyance roller, an opening / closing member, a buffering means, a locking means, and a rotation control means, wherein the conveyance roller conveys an original by pressing it against an original reading section. Yes, it is housed in an exterior cover having a document insertion port and a document ejection port, and an opening / closing member opens and closes the document insertion port or both the document insertion port and the document ejection port, and is slidable on the exterior cover. It is attached and has a locking portion for locking the open position and a knob projecting to the outside of the exterior cover, and is constantly urged in the direction of closing the document insertion port and the document ejection port, and the buffer means is the moving speed of the opening / closing member. And has a buffer and a pressing portion for crimping the buffer to the opening / closing member, and the locking means fixes the opening / closing member to the open position,
A rotatable clamp arm having a locking claw that engages with the locking part of the opening / closing member at one end, a spring for urging the locking claw of the clamp arm in the opening / closing member opening direction, The rotation control means changes the rotation direction of the transport roller by rotating the clamp arm by reversing the roller to release the engagement between the locking claw and the locking portion of the opening / closing member. The document reading device detects the completion of reading the document and rotates the transport roller in a direction opposite to the document transport direction. 2. The document reading apparatus according to claim 1, wherein the rotation control means reverses the rotation of the conveyance roller after a lapse of a predetermined time after detecting the completion of reading the document.