JPH0363636A - Original table driving device - Google Patents

Abstract

PURPOSE:To prevent damage caused by the collision of an abutting member attached to a rack with an abutting member attached to a pinion at the time of transporting a device by providing a recessed part or an elastic part in the area of the abutting member attached to the rack. CONSTITUTION:In a device where an original table 2 is moved back and forth by rotating the pinion gear 21 meshing with the rack 24 and the table 2 is smoothly moved by making the 1st and the 2nd abutting members 25 and 22 formed of resin about with specified pressure, the recessed part 30 for making the member 22 save into the moving area of the member 25 is provided. At the time of delivering the device from a factory, the device is transported in a state where the member 22 is positioned in the recessed part 30 of the member 25. Thus, the member 22 is prevented from strongly press-contacting with the member 25 caused by vibration, which is absorbed by the recessed part 30, and a dent is not caused in the member 25.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is provided in an image reading device such as a copying machine,
It is connected to a document table driving device for reciprocating the document table using a rack and a pinion gear (hereinafter referred to as pinion).

[Prior Art] For example, in a copying machine, there are two methods for exposing an original: one is to move the original table, and the other is to move the optical system.

The methods for moving the document table are broadly divided into those in which the document table is driven by a wire and those in which the document table is moved by a rack and a pinion.

In the method of driving the document table using a rack and a pinion, a rack is provided on the document table side,
A binion that engages with this rack is rotatably provided on the device body or the like, and the binion is connected to a drive system.

The document table is moved back and forth by rotating the binion by a drive system.

In such an image reading device with a moving document table, when the document table is driven, the table movement speed becomes uneven due to gear backlash, inertia of the document table, and the like. When this unevenness occurs, character blurring occurs and image quality deteriorates.

In order to prevent such deterioration of image quality, conventional
As shown in Japanese Patent No. 154860, a first abutting member is fixed to the rack on the side of the document table, and a second abutting member is provided on the binion, and these abutting members are brought into contact with each other to form a rack. There are some types that prevent changes in the backlash of the pinion, stabilize the engagement between the two, and prevent uneven table movement speed.

[Problems to be Solved by the Invention] However, in such conventional devices, the first abutting member may be damaged by the second abutting member due to drop impact during shipping from the factory or due to aging due to high temperature. Abnormal pressure may be applied from the abutting member, and a dent may be formed in the first abutting member. As a result, the indentation causes uneven movement of the document table, leading to a decrease in image quality.

The present invention aims to solve the problems of the prior art.

[Means for Solving the Problems] A first invention includes a rack provided on the manuscript table side;
It has a first abutment member attached to the rack, a pinion gear provided on the device main body side and meshed with the rack, and a second abutment member attached to the pinion gear, and the pinion gear is rotated by a drive system. In the document table driving device, the document table is moved back and forth by the document table, and first and second abutting members are brought into contact with each other to smooth the movement of the document table. The document table driving device is provided with a recess or an elastic part for letting the second abutting member escape in an area of the first abutting member that the second abutting member faces when reading the document table.

A second aspect of the present invention provides a rack provided on the document table side, a first abutting member attached to the rack, a pinion gear provided on the apparatus main body side and meshed with the rack, and a first abutment member attached to the pinion gear. a second abutment member, the pinion gear is rotated by a drive system to reciprocate the document table;
In the document table driving device in which the movement of the document table is smoothed by abutting the second abutment members, the second abutment members face each other when the document table is moved to read an image. A second abutting member is placed on the first abutting member outside the area of the first abutting member.
The document table is a document table driving device that is provided with a recessed portion or an elastic portion for allowing the abutment member to escape, and is capable of moving the document table beyond the range of movement during image reading.

A third aspect of the present invention provides a rack provided on the document table side, a first abutment member attached to the rack, a pinion gear provided on the apparatus main body side and meshed with the rack, and a pinion gear attached to the pinion gear. a second abutment member, the pinion gear is rotated by a drive system to reciprocate the document table;
In the document table driving device in which the movement of the document table is smoothed by abutting second abutting members, the document table is moved until the second abutting member comes off from the first abutting member. , a document table driving device that can move beyond the range of movement during image reading.

[Function] In the first aspect of the present invention, when the document table is moved for image reading, the second abutting member is caused to escape into the area of the first abutting member that is opposed to the second abutting member. Since the concave part or the elastic part is provided,
When the device is shipped from the factory, by positioning the second abutment member at the recess or elastic portion of the first abutment member, even if the two abutment members collide due to a fall, There is no risk of the second abutting member escaping into the recess or being absorbed by the elastic portion, resulting in an unexpected depression in the first abutting member.

A second aspect of the present invention is that the document table is slid beyond the range of movement during image reading at the time of factory shipment, and the second abutment member faces the first member when the document table is moved to read the image. By positioning the second abutting member at the recessed portion or elastic portion of the first abutting member outside the area of the abutting member, even if the second abutting member falls, both abutting members Even if there is a strong collision, the second
The abutment member escapes or is absorbed by the elastic part, and the first
There is no possibility that an unexpected depression will be formed in the abutting member.

In the third aspect of the present invention, the original table is set to the second position at the time of shipment from the factory.
By sliding the abutment member beyond the movement range during image reading until it comes off the first abutment member, even if the abutment member falls and the second abutment member collides with the first abutment member. Therefore, there is no need to worry about
There is no risk of creating a dent in the abutting member.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a copying machine to which an embodiment of the document table driving device of the present invention is applied. A document table 2 on which a document is placed is arranged on the top surface of the copying machine main body l. The document table 2 is capable of reciprocating movement along an Aki Slide (trade name) 3 and a slider 4. A paper feed cassette 5.6 is removably attached to the lower right side of the copying machine main body l, and a manual feed stand 7 is attached above the paper feed cassette 5. Further, a paper discharge tray 8 for receiving copied paper is attached to the lower left side surface.

FIG. 2 is a schematic sectional view showing the internal structure of the copying machine main body 1. As shown in FIG. Inside and above, an optical system 10 consisting of a light source, a reflecting mirror, a mirror lens, etc. is arranged. Furthermore, a photosensitive drum 11 on which an electrostatic latent image is formed is arranged in the center of the copying machine main body 1. Around the photosensitive drum 11, a charging charge 12, a developing device 13, a transfer charger 14, a separation charger 15, and a cleaner 16 are arranged.
are arranged in order.

A paper feed conveyance path 17 for conveying paper is provided between the paper feed cassettes 5 and 6 and an image forming section constituted by the photoreceptor drum 11 and the like.

Further, on the downstream side of the image forming section, a paper discharge path 18 is provided for conveying the paper on which the image has been transferred to the fixing device 19, and between the fixing device 19 and the paper discharge tray 8, A roller 20 is provided.

FIG. 3 is a sectional view of the document table driving device according to the present invention. This device is provided behind the document table 2. Moreover, FIG. 4 is a view seen from the side.

A shaft 23 is provided in a protruding manner on the rear frame 1a of the main body 1 of the copying machine, and a pinion 21 is rotatably mounted on this shaft 23. The binion 21 is connected to a drive system (not shown) by a gear mechanism.

Further, a brake roller 22, which is an example of a second abutting member, is provided integrally with the pinion 21. The diameter of the brake roller 22 is smaller than the inner diameter of the meshing pitch of the binion 21. On the other hand, a rack 24 that engages with the binion 21 is fixed to the rear lower surface of the document table 2.

The rack 24 is provided with approximately the same length as the original table 2 along the moving direction of the original table 2. A friction member 25, which is an example of a first abutting member, is formed integrally with this rack 24.

The lower surface of the friction member 25 is in contact with the outer peripheral surface of a brake roller 22 formed integrally with the binion 21 with a predetermined pressing force. In addition, the brake roller 22 and the friction member 2
5 are each molded with resin.

In FIG. 4, X indicates the area of the first abutting member 25 that the second abutting member 22 faces when moving the document table 2 to read an image. Movement means relative movement. A recess 30 is provided within the area X to allow the second abutment member 22 to escape. Note that it is desirable that the recess 30 is not on the leading edge side of the document, or that the recess 30 is
0 may be fitted with an elastic member such as rubber or plastic to form an elastic portion (not shown).

FIG. 5 shows an embodiment of the second invention, and like FIG. 4, it is a side view of the document table driving device according to the invention. Y indicates an area outside area X of the first abutting member 25 that the second abutting member 22 faces when moving the document table 2 to read an image;
Within that area Y, a second
A recess 31 is formed for allowing the abutment member 22 to escape. Alternatively, an elastic member such as rubber or plastic may be fitted into the recess 31 to form an elastic portion (not shown). In this case, the document table 2
It can be moved beyond the range of movement during image reading.

FIG. 6 shows an embodiment of the third invention, and like FIG. 4, it is a side view of the document table driving device according to the invention. The document table 2 continues until the second abutting member 22 comes off the first abutting member 25.
It can be moved beyond the range of movement during image reading. In the case shown in the figure, the direction in which the second abutting member 22 comes off is along the extension of the moving direction of the second abutting member 22 during image reading.

FIG. 7 shows a case where the second abutment member 22 comes off in a direction substantially intersecting the moving direction of the second abutment member 22 during image reading, and the third
It is a view seen from the same direction as the case in the figure.

Next, the present invention will be explained in detail.

When shipped from the factory, the second abutting member 22 is positioned at the recess 30, 31 or the elastic portion of the first abutting member 25 and transported. Therefore, even if the second abutting member 22 is strongly pressed against the first abutting member 25 due to vibration, the recesses 30, 31. Alternatively, since the elastic portion absorbs it, there is no need to worry about the first abutting member being dented.Furthermore, as shown in FIG. 6 or FIG. By removing the member 25, it is possible to similarly prevent the formation of depressions.

After being transported in this way, at the location where the copying machine is installed,
The first abutting member 25 and the second abutting member 22 are aligned at positions where the original image can be formed. For example, in the case of the invention shown in FIG. 7, as shown in FIG.
An idle gear 35 with a cam 36 is provided near the pinion 21, and by simultaneously rotating the idle gear 35 during image formation driving, the cam 36 rotates and the pinion 21 is rotated.
By moving the second abutting member 22 in the direction of the arrow, the second abutting member 22 can be set at the original abutting position.

In the embodiment described above, the rack 24 and the friction member 25 are integrated, and the binion 21 and the brake roller 22 are integrated.
Although these are integrated, they may be separate entities.

[Effects of the Invention] As described above, the present invention provides a concave portion, an elastic portion, or a space portion that absorbs the movement of the abutting member even if it falls during shipping or is exposed to high temperatures. Because of this, it is possible to eliminate inconveniences such as depressions being formed in the abutting member, causing uneven movement of the document table, and deteriorating the quality of image formation.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a copying machine in which a document table drive device according to the present invention is used, and FIG. 2 is a sectional view of the copying machine.
FIG. 3 is a longitudinal sectional view of the original table driving device, FIG. 4 is a side view of the same device seen from another direction, and FIG. 5 is a second
FIG. 6 is a side view of the document table driving device of the present invention.
Side view of the document table driving device of the third book 1 invention, No. 7
1! 1 is a front view of another embodiment of the same device, and FIG. 8 is a front view for explaining the operation of the same embodiment.

Claims (5)

[Claims] (1) A rack provided on the document table side, a first abutment member attached to the rack, a pinion gear provided on the device main body side and meshed with the rack, and a second abutment member attached to the pinion gear. The document has a member, in which the pinion gear is rotated by a drive system to reciprocate the document table, and the document table is moved smoothly by abutting first and second abutment members. In the table driving device, a recess for letting the second abutment member escape into an area of the first abutment member that the second abutment member faces when moving the document table to read an image;
Alternatively, a document table driving device characterized by being provided with an elastic portion. (2) A rack provided on the document table side, a first abutment member attached to the rack, a pinion gear provided on the apparatus main body side and meshed with the rack, and a second abutment member attached to the pinion gear. The document has a member, in which the pinion gear is rotated by a drive system to reciprocate the document table, and the document table is moved smoothly by abutting first and second abutment members. In the table driving device, when the document table is moved to read an image, a second abutting member is attached to the first abutting member outside an area of the first abutting member that the second abutting member faces. A document table driving device characterized in that a concave portion or an elastic portion for release is provided, and the document table is movable beyond a movement range during image reading. (3) A rack provided on the document table side, a first abutment member attached to the rack, a pinion gear provided on the apparatus main body side and meshed with the rack, and a second abutment member attached to the pinion gear. The document has a member, in which the pinion gear is rotated by a drive system to reciprocate the document table, and the document table is moved smoothly by abutting first and second abutment members. In the table driving device, the document table is movable beyond a movement range during image reading until the second abutting member comes off the first abutting member. . (4) The document table driving device according to claim 3, wherein the direction in which the second abutting member comes off is in an extension of the moving direction of the second abutting member during image reading. (5) The document table drive according to claim 3, wherein the direction in which the second abutting member comes off is in a direction substantially intersecting a moving direction of the second abutment member during image reading. Device.