JPH08324879A - Automatic roller pressure releasing device - Google Patents

Abstract

PURPOSE: To remove a jammed document in one action, prevent a device from being broken by improper operation of a user, improve operability, reduce the number of part items, improve the assembling property, and reduce the cost. CONSTITUTION: A rib 2 (projection) is provided on the side face of a pressure plate 1, and a cam 3 coaxial with a roller and having a pin 5 slid along the upper face of the rib 2 is provided. The pin 5 is pushed up by the rib 2 when the pressure plate 1 is released, and a sensor is pushed down by the action of the cam 3 (projection 31) rotated interlockingly with the pin 5. An elastic member may be used between the cam 3 and the pin 5, or a bearing and the pin 5 may be integrally molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading apparatus having a contact type image sensor used in a facsimile machine or the like, and more particularly to a roller pressure automatic releasing device for the contact type image sensor.

[0002]

2. Description of the Related Art As a scanner for reading an original in a facsimile machine or the like, there is a long optical path image sensor having a mirror and a lens optical system, but a contact type image sensor is used because it is advantageous for downsizing of the apparatus. Things that were used are becoming more common. When the contact type image sensor is used, the depth of focus is shallow, so it is necessary to bring the original and the image sensor into close contact with the roller for reading. Therefore, as a jam original removal operation when a jam occurs, it is common to first open the pressure plate and then release the roller pressure to remove the jam original. As a conventional technique for releasing the roller pressure when the pressure plate is released, for example, an actual flat plate 6-
There is one disclosed in Japanese Patent No. 41276. In this publication, a contact type image sensor is arranged in pressure contact with a platen roller in a document feeding path formed between a main body of the apparatus and a scanner cover which is openably and closably attached, and the contact type image sensor is opened in the scanner cover. There is described a facsimile device provided with a sensor operation mechanism that retracts from a pressure contact position with a platen roller to a separated position in association with an operation.

[0003]

As described above, in the conventional contact image sensor type document reading apparatus, in order to remove the jammed document, it is necessary to first open the pressure plate and then release the roller pressure. , Each time a jam occurs, a two-step operation is required. Therefore, it was very complicated for the user. Further, in the facsimile apparatus described in the above publication, the contact-type image sensor is retracted from the pressure contact position with the platen roller to the separated position in association with the opening operation of the scanner cover. The contact image sensor can be released from the pressure of the platen roller by operation, and the jammed document can be removed, but the structure for interlocking it is complicated and may cause a failure by the user's operation, or in some cases destroy the device. In addition, there is a problem that the number of parts is large and the assemblability is not good. The object of the present invention is 1
The purpose is to enable the removal of the jammed original by the operation and improve the operability for the user. Another object of the present invention is to prevent the device from being damaged by an inappropriate operation by the user and improve the operability. Still another object of the present invention is to
It is to reduce the number of parts, improve the assemblability, and reduce the cost.

[0004]

In order to achieve the above object, the present invention is directed to a roller pressure automatic release device of a document reading apparatus using a contact image sensor 4 in which a rib 2 (protrusion) is provided on a side surface of a pressure plate 1. And a cam 3 provided with a pin 5 which is coaxial with the roller and slides along the upper surface of the rib,
A cam 3 (projection 31) that rotates in conjunction with the pin 5 by pushing up the pin 5 with the rib 2 when the pressure plate 1 is released
The feature is that the sensor is pushed down by. Further, it is characterized in that an elastic member is provided between the cam and the pin, and when the rib is located above the pin, the elastic member is deformed by a pressure plate closing operation so that the rib can be returned below the pin. Further, the roller bearing and the cam are integrally formed. Also, the present invention
A roller bearing is inserted into an elongated hole provided on the housing side plate, a pin integrated with the roller bearing is inserted into a hole provided on the side surface of the pressure plate, and a pin interlocked with the opening / closing operation of the pressure plate and The bearing position of the roller integrated with the pin is moved to separate or press the roller and the contact image sensor. Also, the roller bearing and the pin are integrally formed.

[0005]

According to the present invention, the sensor is pushed down by the action of the cam (projection) that rotates in conjunction with the pin when the pin is pushed up by the rib when the pressure plate is released. There is a gap in the sensor, which makes it easy to remove jammed documents.
In addition, since the elastic member is provided between the cam and the pin, the device is less likely to be destroyed even when the user violently opens the pressure plate. It becomes possible to return to the initial state even when the vehicle has overwhelmed 5. Further, the bearing of the roller is inserted into the long hole provided in the side plate of the housing, and the pin integrated with the bearing of the roller is inserted into the hole provided on the side surface of the pressure plate,
By moving the pin and the bearing position of the roller integrated with the pin in conjunction with the opening / closing operation of the pressure plate so as to separate or press the roller and the contact image sensor, the user only performs the opening / closing operation. The roller and the sensor can be separated from each other or pressed against each other. Further, by integrally forming the members, the number of parts can be significantly reduced, and the assembling property can be improved and the cost can be reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automatic roller pressure releasing device of the present invention will be described with reference to the drawings. FIG. 1 shows a structure in which a gap for removing jammed originals is automatically formed between the roller and the image sensor when the pressure plate is opened. In the figure, 1 is a pressure plate, 2 is a side rib provided on a side surface of the pressure plate 1, 3 is a cam, 4 is a close contact type image sensor, 5 is a cylindrical pin provided in a part of the cam 3, 6 is a roller, 7 is a roller 6
Is a roller bearing that is provided coaxially with and supports the cam 5. The operation of this configuration will be described below. FIG. 1A is a side view of the state before opening the pressure plate 1, FIG.
FIG. 1B is a view of the state of FIG. 1A viewed from above, and FIG.
[Fig. 3] is a view showing a state where the pressure plate 1 is opened. As can be seen from FIG. 1B, the cam 3, the pin 5 provided on the cam 3,
The bearing 7 is outside the pressure plate 1, and when the pressure plate 1 is opened from the state of FIG. 1A, the pin 5 is caught by the side rib 2 provided on the side surface of the pressure plate 1 and the opening action of the pressure plate 1 is accompanied. The pin 5 and the cam 3 which is interlocked with it are rotated. The cam 3 has a protrusion 31, and as shown in FIG.
When the pressure plate 1 is in the open state, the protrusion 31 separates the bearing 7 and the roller 6 interlocked with the bearing 7 from the contact image sensor 4 to enable the removal of the jammed document. The drive transmission gear is separated by moving the axial position of the roller.

FIG. 2 shows an embodiment in which strip-shaped pins and ribs are used instead of the cylindrical pins in the embodiment shown in FIG. In the same figure, it is a figure for demonstrating operation which opens from the state (a) when the pressure plate 1 is closed. The operation is the same as that in the case of FIG. 1, and when the pressure plate is opened from the state of (a), the pin 5 is caught by the side rib 2 of the pressure plate and the cam 3 is rotated in conjunction with the projection, and the projection 31 of the cam 3 causes the roller 6 and the image. The sensor 4 is moved away from each other to form a gap, and the jammed document can be removed.

FIG. 3 is for explaining the operation when the pressure plate 1 is closed from the open state (a) in the configuration of FIG. In FIG. 3A, when the pressure plate 1 is closed, the bottom surface 8 of the pressure plate is caught by the pin 5 and the pin 5 is pushed down with the operation of closing the pressure plate 1 to rotate the cam 3 in the direction opposite to that in FIG. The state shown in FIG. In the state of FIG. 3B, since the protrusion 31 of the cam 3 is separated from the roller, there is no separation between the roller 6 and the image sensor 4, and the state returns to the initial state in which they are in close contact with each other.

4 to 6 are views showing an embodiment in which the arm 11 to which the pin 5 is attached is made of an elastic member. In this embodiment, as shown in FIG. 4, even if the pressure plate 1 is opened for some reason and only the cam 3 (and the pin 5) is in the initial state, the entire structure is again shown in FIG. It is designed to be able to return to the initial state. Next, the operation of this embodiment will be described. FIG. 4B shows a state in which the side rib 2 of the pressure plate has passed over the pin 5, for example, when the user performs an unreasonable operation to open the pressure plate. FIG. 4A is a view of this from above. Here, FIG. 4C shows A- of FIGS. 4A and 4B.
It is a figure which shows the cross section of A, and has shown that the lower surface of the rib 2 and the upper surface of the pin 5 on the side surface of the pressure plate are inclined.

When the side plate rib 2 of the pressure plate has passed over the pin 5 and the pressure plate 1 is closed from the state shown in FIG. 4, the pin 5 in the initial position collides with the side plate rib 2 of the pressure plate 1. Since the lower surface of the rib 2 and the upper surface of the pin 5 are oblique and the arm 11 is made of an elastic member, when the side rib 2 and the pin 5 contact each other,
Is elastically deformed in the lateral direction, and the state shown in FIG. 5 is obtained. 5A to 5C are diagrams corresponding to FIGS. 4A to 4C, respectively. 5 (a) and 5 (c), the arm 11 is elastically deformed in the lateral direction to overcome the rib 2 over the pin 5 in the initial state and return to the normal initial state as shown in FIG. Note that FIGS. 6A to 6C are respectively shown in FIG.
5A to 5C are diagrams corresponding to FIGS. 5A to 5C. With this configuration, the device is less likely to be broken even when the user roughly opens the pressure plate. Further, even if the pressure plate side rib 2 gets over the pin 5 by performing an unreasonable opening operation, the initial state can be restored.

FIG. 7 shows the example shown in FIG. 1 (a pin on a cylinder).
FIG. 6 is a view in which the cam 5 and the bearing 7 are integrally formed in FIG. As a material to be integrally molded, for example, a high sliding molding material such as polyacetal can be considered. FIG. 8 is a view in which the cam 5 and the bearing are integrally formed in the example shown in FIGS. 2 to 6 (where the ends of the strip-shaped pin 5 and the pin 5 are slanted and the arm 11 is made of an elastic member). . Also in this case, for example, it may be integrally molded with a high sliding molding material such as polyacetal. By doing so, the number of parts can be significantly reduced, and the assemblability can be improved and the cost can be reduced.

FIG. 9 shows another embodiment of the present invention. Here, as shown in FIG. 10, a bracket including an arm and a pin is integrally molded with the roller bearing 7, and as shown in FIG. 9A, the pin portion of the bracket is formed in the hole 22 provided on the side surface of the pressure plate. Insert rotatably. When opening the pressure plate,
As shown in FIGS. 9B and 9C, the pin inserted into the hole 22 is pulled up in association with the opening operation of the pressure plate, and accordingly, the bearing 7 integrally formed with the pin extends along the elongated hole 23. It is pulled up while rotating. As a result, the roller and the image sensor 4 are separated from each other, and the jammed document or the like is easily removed. When the pressure plate is closed, the operation shown in FIG.
It operates in the order of (c), (b), and (a). That is, with the pin that has entered the hole 22 provided on the side surface of the pressure plate, the bracket is rotated in the reverse direction of the time of release and pulled down along the elongated hole 23,
It returns to the initial state where the roller and the sensor are in pressure contact. As a result, it is possible to prevent the device from being damaged due to an operation error by the user and improve the operability. Further, as described above, by integrally forming the roller bearing 7 and the bracket (see FIG. 10), the number of parts can be reduced, and the assemblability and cost can be improved.

[0013]

According to the present invention, the user can control the separation between the roller and the sensor or the pressure contact by simply performing the opening / closing operation.
It becomes easy to remove jammed originals. In addition, since the elastic member is provided between the cam and the pin, the device is less likely to be destroyed even when the user violently opens the pressure plate. 5
It is possible to return to the initial state even if you have overcame. Further, by integrally forming the members, the number of parts can be significantly reduced, and the assembling property can be improved and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a structure for automatically forming a gap for removing a jammed document between a roller and an image sensor when a pressure plate is opened according to an embodiment of the present invention.

FIG. 2 is an embodiment of the present invention in which strip-shaped pins and ribs are used instead of the cylindrical pins in the embodiment of FIG.

FIG. 3 is a view for explaining the operation when the pressure plate is closed from the open state in the configuration of FIG.

FIG. 4 is a view for explaining the operation when the arm to which the pin is attached is made of an elastic member (No. 1).

FIG. 5 is a view for explaining the operation when the arm to which the pin is attached is made of an elastic member (No. 2).

FIG. 6 is a view for explaining the operation when the arm to which the pin is attached is made of an elastic member (No. 3).

FIG. 7 is a view in which the cam and the bearing are integrally formed in the example (pin on the cylinder) shown in FIG.

FIG. 8 is a view in which the cam and the bearing are integrally formed in the example shown in FIGS. 2 to 6 (in which the ends of the strip-shaped pin 5 and the pin 5 are inclined and the arms are made of elastic members).

FIG. 9: A roller bearing is inserted into an elongated hole provided on a housing side plate, and a pin integrated with the roller bearing is inserted into a hole provided on a side surface of the pressure plate to interlock with opening / closing operation of the pressure plate. FIG. 9 is a view for explaining another embodiment of the present invention in which the roller and the contact image sensor are separated or brought into pressure contact with each other.

10 is a view in which the bearing and the pin part shown in FIG. 9 are integrally molded.

[Explanation of symbols]

 1: pressure plate 2: side ribs provided on the pressure plate 3: cam 4: contact image sensor 5: pin 6: roller 7: bearing 8: pressure plate lower surface 9: rib lower surface 10: pin upper surface 11: arm portion 31: cam protrusion

Claims (5)

[Claims] 1. A roller pressure automatic release device for a document reading apparatus using a contact image sensor, wherein a rib (protrusion) is provided on a side surface of a pressure plate, and a pin which slides along the upper surface of the rib coaxially with the roller is provided. A roller pressure automatic releasing device, characterized in that it has a cam for pressing, and when the pressure plate is released, the rib pushes up the pin and the cam pushes down the sensor. 2. The document reading apparatus according to claim 1,
An elastic member is provided between the cam and the pin, and when the rib is above the pin, the elastic member is deformed by a pressure plate closing operation so that the rib can be returned below the pin. Roller pressure automatic release device. 3. The automatic roller pressure releasing device according to claim 1 or 2, wherein the roller bearing and the cam are integrally formed. 4. A roller pressure automatic release device for a document reading apparatus using a contact image sensor, wherein a roller bearing is inserted into an elongated hole provided in a casing side plate, and a pin integrated with the roller bearing is attached. Insert into the hole provided on the side of the pressure plate,
A roller pressure automatic releasing device characterized in that the pin and the roller bearing integrated with the pin are moved in association with the opening / closing operation of the pressure plate to separate or press the roller and the contact image sensor. . 5. The automatic roller pressure releasing device according to claim 4, wherein the roller bearing and the pin are integrally formed.