JP2758681B2 - Copier - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a copier equipped with an automatic document feeder having a document switchback mode and a document reversal mode.

(Prior Art) As one type of automatic document feeder (hereinafter referred to as ADF) mounted on a copying machine, an ADF having a document switchback mode and a document reversing mode as shown in FIG. 12 is known. .

 This ADF is structured as follows.

In the main body of the ADF 1, as shown in FIG. 12, a paper feed unit 2 and a reversing / discharge unit 3 are arranged independently at both ends thereof. A document transport belt 4 is arranged between the paper discharge unit 3 and the document transport surface 4a so as to lightly contact the document loading surface 6a of the contact glass 6 of the copying machine body 5.

The reversing / discharging section 3 has a document reversing mechanism, which enables automatic two-sided copying of a two-sided document.

In FIG. 12, when a document 0 is placed on the document table 7 and inserted until it is slightly touched, the document set detector 8 detects the document 0 and the document insertion display is turned off.

In this state, when the start key of the copying machine body 5 is pressed,
The call roller 9 and the belt drive roller 10 are driven,
Document 0 is fed.

At this time, as for the fed document 0, only the lowermost one document is fed by the separation belt 12a and the separation roller 12.

The size of the document 0 passing through the separation roller 12 is detected by registration detection, document width detection, pulse generator, and document length detection.

Here, the trailing edge of the document passes the registration detection, the registration detection is turned off, and when a specified pulse is reached, the conveyance motor is turned off, the document conveyance belt 4 is stopped, and the document 0 is placed on the document placing surface 6a. Stops at the specified position.

At this time, the original 0 is caused to overrun the original once, and then the end of the original scale 11 is set by an original switchback mode in which the original is transported in a direction opposite to the paper feeding direction by the reverse rotation of the transport motor. The document is placed on the document placing surface 6a in a state of being abutted against the document reference end 11a.

In this state, when the image scanning of the document 0 is completed and a document replacement signal is input from the copying machine main body 5, the conveying motor and the paper discharging motor are turned on, and the document after the image scanning is discharged from the reversing / paper discharging unit 3. The paper is discharged onto the paper discharge tray 13 'by the paper roller 13, and the original is fed for the next image scanning by the same operation as described above.

Here, when performing image scanning on both sides of document 0,
The original having undergone the image scanning on one side is once passed over the contact glass 6, and then the image side of the original is reversed by the reversing rollers 14 and the reversing switching claws 15 of the reversing / discharging section 3. The document is transported onto the placing surface 6a in the document reversal mode for transporting the document again.

The original conveyed again on the original placing surface 6a in the original reversing mode is, as in the original switchback mode, with its end abutting on the original reference end 11a side of the original scale 11, The original is placed on the original placing surface 6a.

As a result, the document whose front and back are reversed is scanned on the reverse side of the original in the same manner as in the normal copy mode, and then discharged onto the discharge tray 13 'by the discharge roller 13. .

By the way, the conventional ADF1 configured as described above is
As shown in FIG. 13, the original transport belt 4 in the paper feed unit 2, the free end 17a of the polyester film (mylar) 17 fixed to the original guide plate 16, and the original reference end 11a of the original scale 11 are provided. The upper edges are arranged so as to contact each other.

Here, the mylar 17 causes the document conveying belt 4, the document 0, and the document placing surface 6a to move to the fourteenth by frictional charging due to the contact.
It has a function of improving the transportability of the document 0 by forming a charging system as shown in the figure.

The amount of contact between the original transport belt 4 and the original scale 11 is determined by a fixed roller 18 disposed inside the original transport belt 4.
Is maintained at a constant level.

As shown in FIGS. 15 and 16, the fixed roller 18 is formed by arranging a plurality of rollers 18a on a shaft-shaped roller, and is located at a position separated from each convex portion 11b 'of the original scale 11. The rollers 18a are arranged so as to stabilize the contact amount of the document conveying belt 4 with the document reference end 11a of the document scale 11.

The original transport belt 4 and the original reference end of the original scale 11
The original reference edge of the original scale 11 is in contact with the upper edge of the original
The document 0 applied to the document 11a is prevented from running over the document reference end 11a, and the accuracy of resisting the leading edge of the document 0 and preventing skew is improved.

(Problems to be Solved by the Invention) By the way, a conventional copier equipped with this kind of ADF1 is
As described above, when the original conveying belt 4 contacts the upper edge of the original reference end 11a of the original scale 11, the original reference end 11a of the original 0
Although it is configured to prevent riding from 1a, this configuration has the following problems.

. Since the contact resistance between the document conveying belt 4 and the document scale 11 is large, it is necessary to drive the document conveying belt 4 with a drive motor having a large output, which increases product cost and running cost.

. The wear of the document transport belt 4 at the contact portion with the document scale 11 is severe, and the life of the document transport belt 4 is short.

. The document conveying belt 4 is heavily soiled at the contact portion with the document scale 11, and the cleaning cycle of the document conveying belt 4 and the document placing surface 6a is shortened.

. Original scale at the contact portion with original transport belt 4
The wear of the document 11 is severe, and the function of preventing the document 0 from running over when the document 0 abuts on the document reference end 11a, and its initial quality are reduced.

The present invention has been made in view of the above points,
The purpose is to make contact resistance between the original transport belt and the original scale at the contact area between the original transport belt and the original scale.
An object of the present invention is to provide a copying machine capable of reducing contamination and abrasion and stabilizing initial quality for a long period of time.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention is directed to a first aspect of the present invention, wherein a document reference end of a document scale arranged on a document placing surface of a copying machine main body is provided. In a copying machine equipped with an automatic document feeder for abutting a document fed by a document conveying belt, a rigid body, an elastic body,
The document scale is formed by laminating sheets having a low coefficient of friction, and the document conveying belt of the automatic document feeder is brought into contact with the sheet of the document scale.

According to a second aspect of the present invention, in the copying machine according to the first aspect,
A plurality of concave portions are formed on the elastic body at the document reference end side and are spaced apart from the document reference end, and slits are provided at positions corresponding to the respective concave portions of the sheet of the document scale.

According to a third aspect of the present invention, in the copying machine according to the second aspect,
Each concave portion of the elastic body and each slit of the sheet correspond to each roller of the fixed roller arranged in the conveyance belt of the automatic document feeder, and these concave portions and slits are formed on the outer periphery of each roller. And at a position separated from both sides.

According to a fourth aspect of the present invention, there is provided a copying machine having an automatic document feeder for abutting a document fed by a document conveying belt against a document scale disposed at a document reference end on a document placing surface of a copying machine body. A rigid body, an elastic body, and a thin sheet having a low coefficient of friction are laminated in order from the original placing surface side to form the original scale, and the original transport belt is brought into contact with the original scale sheet, A plurality of slits are provided on the body reference end side of the body and the sheet.

A copying machine equipped with an automatic document feeder for abutting a document fed by a document conveying belt on a document scale arranged at a document reference end on a document placing surface of a copying machine body. In the above, the rigid body, the elastic body, and a thin sheet having a low coefficient of friction are laminated in order from the document placing surface side to constitute the document scale, and the document scale of the document scale is attached to a document conveying belt of the automatic document feeder. Along with bringing the sheet into contact, the elastic body and the original reference end side of the sheet correspond to the rollers of the fixed roller disposed in the transport belt of the automatic document feeder, and the outer periphery of these rollers and A plurality of recesses are formed to be isolated from both sides.

(Operation) According to the present invention, the upper edge of the original reference end of the original scale is brought into contact with the original conveying belt via a thin sheet having a low coefficient of friction, and the original conveying belt is brought into contact with the original scale. Since the contact pressure at the section is absorbed and reduced by the elastic body of the original scale, the contact resistance between the original transport belt and the original scale is reduced.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

However, the configuration and operation in a range that can be clearly recalled from the description of the present specification, and the above and other objects and novel features of the present invention are omitted from illustration and disclosure in order to avoid complication of description. Or simplify it.

In the copying machine according to the present invention, the original scale 11 for positioning the original on the original placing surface 6a is configured as follows in order to achieve the above object.

That is, the original scale 11 of the copying machine is
As shown in the figure, a rigid body 11A, an elastic body 11B, and a sheet 11C are laminated in order from the side of the original placing surface 6a of the contact glass 6 of the copying machine body 5.

Here, the rigid body 11A is similar to the conventional manuscript scale,
It is made of resin or the like, and is fixed to a scale fixing plate 20 of the copying machine main body 5 by screws 21.

At this time, the contact glass 6 is pressed and fixed to the copying machine main body 5 by fixing the end on the document reference side between the rigid body 11A and the scale fixing plate 20.

As a result, the rigid body 11A of the original scale 11 faces the predetermined position on the original reference side of the contact glass 6, and the reference position of the start of image scanning of the original 0 on the original placing surface 6a of the contact glass 6 That is, the abutting position of the end of the document 0 in the document switchback mode and the document reversal mode is set.

On the other hand, the elastic body 11B of the original scale 11 is formed of, for example, a material such as sponge or foamed urethane, and is adhered and fixed on the rigid body 11A of the original scale 11.

As the elastic body 11B, a thin leaf spring may be fixed to the rigid body 11A.

Here, the end of the elastic body 11B on the original placing surface 6a side is configured to match that of the rigid body 11a of the original scale 11.

The sheet 11C of the original scale 11 is formed of a thin sheet having a low coefficient of friction, for example, a polyester film such as Mylar having a thickness of about 0.2 mm, like the elastic body 11B described above. The end of the original placing surface 6a side is made to correspond to that of the original scale 11, and is adhered and fixed on the elastic body 11B of the original scale 11.

The document scale 11 configured as described above is arranged with the document conveying belt 4 in contact with the upper edge of the document reference end 11a, similarly to the conventional document scale.

At this time, in the document scale 11 according to the present embodiment, the document conveyance surface of the document conveyance belt 4 is brought into contact with the upper edge of the document reference end 11a, that is, the upper edge of the sheet 11C on the document reference end side.

As shown in FIG. 2, the original scale 11 has an elastic body of the original scale 11 in accordance with the contact pressure of the fixed roller 18 of the original transport belt 4 with the original scale 11.
11B is pressed and deformed.

Therefore, according to the present embodiment, the upper edge of the document reference end 11a of the document scale 11 and the document transport belt 4 are contacted via the thin sheet 11C having a low coefficient of friction, and the document transport belt 4 The contact pressure at the contact portion with the original scale 11 is absorbed and reduced by the elastic body 11B of the original scale 11.

By the way, a fixed roller for bringing the document conveying belt 4 into contact with the upper edge of the document reference end 11a of the document scale 11
As described above, the roller 18 has a plurality of rollers 18 on an axial roller.
a (see Fig. 15).

For this reason, a difference occurs in the contact pressure (contact amount) between the document transport belt 4 and the document scale 11 between the shaft portion of the fixed roller 18 and the disposition portion of each roller 18a. When the document scale 11 is simply brought into contact, the contact resistance at the contact portion and the amount of deflection of the elastic body 11B become non-uniform, and the contact resistance of the portion corresponding to each roller 18a becomes different from that of the other portion. There is a problem that it becomes larger than that.

A second embodiment of the present invention for solving this problem will be described below.

In the second embodiment, in order to solve the above-described problem,
Elastic body 11B of original scale 11 in the first embodiment
As shown in FIGS. 3 and 4, a plurality of recesses 11b are formed at a distance L from the document reference end 11a of the document scale 11, and as shown in FIG. The slit 11c is provided at a position on the sheet 11C of the original scale 11 corresponding to each recess 11b of the elastic body 11B.

Here, each recess 11b of the elastic body 11B in this embodiment,
3 and 5, the slits 11c of the sheet 11C correspond to the rollers 18a of the fixed roller 18 disposed in the transport belt 4 of the ADF 1, and both sides of the recess 11b. Position and the position of the slit 11c are fixed rollers 18
The roller 18a is formed at a position separated from the both sides of each roller 18a by a separation distance l.

As a result, as shown in FIG. 6, the respective concave portions 11b of the elastic body 11B are brought into contact with the original conveying belt 4 and the original scale 11 by the respective rollers 18a of the fixed rollers 18 so that the upper and lower sides of the original reference end thereof are moved upward. The edge faces a position separated from the document transport belt 4.

Further, both sides of each recess 11b of the elastic body 11B and the sheet 11
As shown in FIG. 7, each slit 11c of C faces a position separated from both sides of the roller 18a of the fixed roller 18 in a state where the document conveying belt 4 and the document scale 11 are in contact with each other.

Therefore, according to the original scale 11 in the second embodiment, when the original conveying belt 4 and the original scale 11 are in contact with each other, as shown in FIG. Since the sheet 11C bends more easily than other portions, the contact resistance at the contact portion between the document conveying belt 4 and the document scale 11 can be further reduced, and the contact pressure at the contact portion can be made uniform. Can be changed.

In the second embodiment, the elastic body 11B of the original scale 11 is provided with the concave portion 11b,
The sheet 11C is provided with a slit 11c so as to reduce the contact pressure between the document conveying belt 4 and the document scale 11 at a portion corresponding to each roller 18a of the fixed roller 18. As another method for reducing the contact pressure of the part which has been made, instead of forming the concave part 11b in the elastic body 11B, as shown in FIG.
A slit similar to 1c may be formed in the elastic body 11B.

In the case of the third embodiment, as in the case of the second embodiment, each roller of the fixed roller 18 is kept in contact with the original conveying belt 4 and the original scale 11 as shown in FIG.
The elastic body 11B and the sheet 11C at the portion corresponding to 18a bend more easily than other portions, and
The contact resistance at the contact portion between the document and the document scale 11 is reduced, and the contact pressure at this contact portion is made uniform.

Further, as another method of reducing the contact pressure of the portion corresponding to each roller 18a, instead of forming the slit 11c in the sheet 11C, as shown in FIG. A similar recess may be formed in the sheet 11C.

In the case of the fourth embodiment, as in the case of the third embodiment, as shown in FIG. 11, each of the fixed rollers 18 is kept in contact with the original conveying belt 4 and the original scale 11. The elastic body 11B and the sheet 11C at the portion corresponding to the roller 18a bend more easily than the other portions, so that the contact resistance at the contact portion between the document conveying belt 4 and the document scale 11 is reduced, and The contact pressure in the part is made uniform, and the stated purpose can be achieved.

As described above, according to the present invention, the upper edge of the original reference end 11a of the original scale 11 and the original transport belt 4 are brought into contact with each other via the thin sheet 11C having a low coefficient of friction, and the original transport belt Since the contact pressure at the contact portion between the document 4 and the document scale 11 is absorbed and reduced by the elastic body 11B of the document scale 11, the contact resistance between the document transport belt 4 and the document scale 11 is reduced.

Therefore, in the copying machine of the present invention, the dirt and friction of the original transport belt 4 and the original scale 11 at the contact portion between the original transport belt 4 of the ADF 1 and the original scale 11 are reduced, and their life and aesthetics are extended over a long period of time. Can be kept.

Further, according to the original scale 11 of the present embodiment, the original 0 can easily be moved over the original reference end 11a of the original scale 11 in the original switchback mode or the original inversion mode, which is the original function. And resisting and skew prevention of the original 0 can be satisfactorily performed.

Further, in the document scale 11 of the present embodiment, the printing of the index such as the document size is performed on the sheet 11C, so that the printing surface becomes flat, and the printing limit of the index as in the case of the conventional scale is restricted. And the printing performance is improved.

Further, the sheet C of the original scale 11 has the original conveying belt 4, the original 0, and the original placing surface 6a in a charging sequence as shown in FIG. The function of Mylar 17 can be combined.

Therefore, in the ADF using this manuscript scale 11, the first
The mylar 17 of the document guide plate 16 as shown in FIG. 3 becomes unnecessary.

Further, according to the present invention, the contact resistance between the document conveying belt 4 and the document scale 11 is reduced, so that the driving mechanism and the driving source of the ADF 1 can be reduced in size and weight and output can be reduced.

(Effects of the Invention) According to the present invention, the original conveying belt can be driven by a drive motor having a small output, and the product cost and running cost of the ADF can be reduced.

Further, the life of the document transport belt and the document scale can be extended.

Further, the cleaning cycle of the document conveying belt 4 and the document placing surface 6a can be lengthened.

In addition, the wear of the original scale 11 at the contact portion with the original transport belt 4 is reduced, and the function of preventing the original 0 from running when the original 0 abuts on the original reference end 11a and the initial quality thereof are maintained for a long time. Can be maintained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an original scale according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view showing a state of contact between the above-mentioned original scale and an ADF original conveying belt, and FIG. 3 is a plan view of FIG. 4, FIG. 4 is a sectional view taken along line XX of FIG. 3, FIG. 5 is a plan view of a main part of the original scale according to another embodiment of the present invention, and FIG. 6 is an original scale and ADF of the embodiment of FIG. FIG. 7 is a schematic cross-sectional view showing the state of contact with the original transport belt, and FIG.
-Y sectional view, Fig. 8 is a perspective view of a main part of a document scale according to still another embodiment of the present invention, and Fig. 9 shows a contact state between the document scale of the embodiment of Fig. 8 and the document transport belt of the ADF. FIG. 10 is a perspective view of a main part of a document scale according to still another embodiment of the present invention, and FIG. 11 is a diagram showing a contact state between the document scale of the embodiment of FIG. 10 and the document conveying belt of the ADF. FIG. 12 is a schematic cross-sectional view of an ADF in a conventional copying machine, and FIG. 13 is a schematic cross-sectional view showing a contact state between a document conveying belt of the ADF and a document scale in the conventional copying machine.
FIG. 14 is a schematic diagram showing a charging sequence during document conveyance, and FIG.
FIG. 15 is a schematic side view of a document scale in the conventional copying machine, and FIG. 16 is a cross-sectional view of a main part showing a contact state between the document conveying belt of the ADF and the document scale in the conventional copying machine. 0: Original, 1: Automatic original feeder, 5: Copy machine body, 6a: Original mounting surface, 11: Original scale, 11A ...
Manuscript scale rigid body, 11B …… Manuscript scale elastic body, 1
1C: Original scale sheet, 11a: Original reference end of original scale, 11b: Recessed part of elastic body, 11c: Slit of sheet, 18: Fixed roller, 18a: Roller of fixed roller.

Claims (5)

(57) [Claims] A copying machine provided with an automatic document feeder for abutting a document fed by a document conveying belt on a document reference end of a document scale disposed on a document placing surface of a copying machine body; The original scale is constructed by laminating a rigid body, an elastic body, and a thin sheet having a low coefficient of friction in order from the original placing surface side, and the original transport belt of the automatic original feeder is connected to the original scale sheet. A copying machine characterized by being brought into contact with. A plurality of recesses formed on the original reference end side of the elastic body and separated from the original reference end;
2. A copying machine according to claim 1, wherein a slit is provided at a position corresponding to each of said concave portions of said sheet. 3. The copying machine according to claim 2, wherein each recess of said elastic body and each slit of said sheet correspond to each roller of a fixed roller disposed in a conveyor belt of said automatic document feeder. And a concave portion and a slit formed at a portion separated from an outer periphery and both sides of each roller. 4. A copying machine equipped with an automatic document feeder for abutting a document fed by a document conveying belt on a document scale arranged at a document reference end on a document placement surface of a copying machine body. The original scale is constructed by laminating a rigid body, an elastic body, and a thin sheet having a low coefficient of friction in order from the original placing surface side, and bringing the original transport belt into contact with the original scale sheet to form the elastic body and the elastic body. A copying machine, wherein a plurality of slits are provided on the original reference end side of a sheet. 5. A copying machine equipped with an automatic document feeder for abutting a document fed by a document conveying belt on a document scale arranged at a document reference end on a document placing surface of a copying machine body. The original scale is formed by laminating a rigid body, an elastic body, and a thin sheet having a low coefficient of friction in order from the original mounting surface side, and the original scale sheet is placed on the original transport belt of the automatic original feeder. At the same time, the elastic body and the original reference end side of the sheet correspond to the respective rollers of the fixed roller disposed in the conveyance belt of the automatic document feeder, and from the outer periphery and both sides of these rollers. A copying machine comprising a plurality of spaced recesses.