JPH0891594A - Document feed device - Google Patents

Abstract

PURPOSE: To easily use a document of special paper size for image formation by displacing a special document detecting mechanism part provided on a special document loading base in response to loading of a document of special paper size, and transmitting the displacement to a standard document detecting means. CONSTITUTION: When a document of standard size is loaded an existing loading base 2 for standard size, the standard document detecting lever 11 of a standard document detecting means 10 is contacted with the document and displaced, and the standard document detecting means 10 is made ON state. Hereby the document of standard size can be carried by means of a paper feed roller 7. A document of special paper size is loaded, in the condition in which a special document loading base 5 is mounted on the document loading base 2 by utilizing fixing studs 27. In this case. the special document detecting lever of the special document detecting mechanism part 23 of the special document loading base 5 is displaced, the displacement is transmitted to the standard document detecting lever 11 by a transmitting member through a supporting shaft, and the standard document detecting means 10 is made ON state. Hereby the document of special paper size can be carried by means of the paper feed roller 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document feeder for stacking documents for image formation and feeding them to a document table of an image forming apparatus.

[0002]

2. Description of the Related Art An outline of a document stacking table 50 of a conventional document feeder will be described with reference to FIG.

Document stacking table 50 of the document feeder shown in FIG.
Is arranged with respect to the center position of the paper feed roller 60 installed in a paper feed frame (not shown), and when the document D is loaded on the document loading table 50, it is placed next to the paper feed roller 60. When the leading edge of the document D comes into contact with the detection lever 70 of the document presence sensor installed, the detection lever 70 is displaced, and the document presence sensor is turned on.

When the document presence / absence sensor is turned on, the control section of the document feeding apparatus recognizes the presence of the document, and the document is conveyed by rotating and driving a paper feed roller (not shown in FIG. 6).
Separate the originals by the separation mechanism provided on the separation roller,
After that, the separated originals are fed by a conveyance roller onto the original table on the image forming apparatus to form an image.

[0005]

However, in the conventional apparatus, the detection levers 70 are provided near the shafts 61 on both sides of the paper feed roller 60 in order to detect the presence / absence of a document loaded on the document loading table 50. It is provided.

That is, the detection lever 70 is arranged substantially in line with the paper feed roller 60 along the width direction of the document D in the leading end region of the document stack base 50. Since the detection lever 70 is installed so as to face the central position, the detection lever 70 cannot be arranged near the central portion of the document stacking table 50 in order to avoid interference with the paper feed roller 60.

As a result, the arrangement position of the detection lever 70 is limited, and when the size of the document D loaded on the document loading table 50 is the standard size (B5, A4, B4, etc.), no problem occurs, but the standard There is a problem that it is impossible to detect the special paper size original D having a paper width smaller than that of the size original D, and the special paper size original D cannot be fed onto the original table.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a document feeding device capable of easily forming an image on a document of a special paper size.

[0009]

According to a first aspect of the present invention, there is provided a document stacking table on which a standard size document is stacked, and a document which is arranged at a front end region of the document stacking table with the center in the width direction of the document as a reference. A paper feed roller that conveys the documents stacked on the stacking table for image formation, and a standard document detection unit that is arranged on the side of the paper feed roller in the leading end region of the document stacking table and detects the presence or absence of standard size documents. And a special document stacking table for stacking a special paper size document that is detachably arranged based on the center of the document stacking table in the width direction, and a special document stacking table provided on the special document stacking table for responding to stacking of a special paper size document. And a special document detecting mechanism section for transmitting the displacement to the standard document detecting means.

According to another aspect of the present invention, there is provided a document feeding device for loading a document of a standard size, and a document loading device which is arranged at a front end region of the document loading device with a center of a width direction of the document as a reference. A paper feed roller that conveys an original to be used for image formation, a standard original detection unit that is disposed on the side of the paper feed roller in the leading end region of the original stacking table, and detects the presence or absence of a standard size original, and the original stacking table. A special document stacking table for loading a document of a special paper size which is detachably arranged based on the center of the width direction of the document, a special document detecting lever provided on the special document stacking table and displaced by stacking a document of a special paper size, and The special original detection mechanism section is composed of a transmission member that transmits the displacement of the special original detection lever to the standard original detection means to turn on the standard original detection means.

According to a third aspect of the present invention, there is provided a document feeding device for loading a document of a standard size, and a document loading device which is arranged at the leading end region of the document loading device with the center in the width direction of the document as a reference. A paper feed roller that conveys an original to be used for image formation, a standard original detection unit that is disposed on the side of the paper feed roller in the leading end region of the original stacking table, and detects the presence or absence of a standard size original, and the original stacking table. Of the special paper size, which is detachably arranged based on the center in the width direction of the paper, and a special paper size of the special paper size which is provided in a position facing the outer periphery of the paper feed roller on the special document loader. A special original made up of a special original detecting lever that is displaced by stacking originals and a transmission member that transmits the displacement of the special original detecting lever to the standard original detecting means to turn on the standard original detecting means. Those having a sensing mechanism.

[0012]

The function of the present invention will be described below.

According to the document feeder of the first aspect, when the standard size document is loaded on the document stacking table, the standard document detecting means detects the presence of the standard size document, and accordingly, the sheet feeding roller is provided. As a result, a standard-sized document loaded on the document loading table can be transported for image formation.

When a special paper size original document is loaded on the special original document loading table mounted on the original document loading table, the special original document detection mechanism provided on the special original document loading table causes the special paper size original document to move. And the displacement is transmitted to the standard document detecting means. As a result, the standard document detecting means detects the presence of the document of the special paper size, and the document of the special paper size stacked on the special document stacking table by the paper feed roller can be conveyed for image formation.

According to the document feeder of the second aspect, when a standard size document is stacked on the document stacking table, the standard document detecting means detects the presence of the standard size document, and accordingly, the sheet feeding roller is provided. As a result, a standard-sized document loaded on the document loading table can be transported for image formation.

Further, when a special paper size document is loaded on the special document loading table mounted on the document loading table, the special document detecting lever of the special document detecting mechanism provided on the special document loading table is displaced. Then, the transmission member transmits the displacement of the special document detecting lever to the standard document detecting means to turn on the standard document detecting means.

Thus, the original of the special paper size, which is loaded on the special original loading table by the paper feed roller, can be conveyed for image formation.

According to the document feeder of the third aspect, when the standard size document is loaded on the document stacking table, the standard document detection means detects the presence of the standard size document, whereby the sheet feeding roller is provided. As a result, a standard-sized document loaded on the document loading table can be transported for image formation.

When a special paper size original document is loaded on the special original document loading table mounted on the original document loading table, a special document is provided on the special original document loading table in a position facing the outer periphery of the paper feed roller. The special document detection lever of the document detection mechanism section is displaced, and the transmission member transmits the displacement of the special document detection lever to the standard document detection means to turn on the standard document detection means.

As a result, a document of a special paper size that cannot be detected by the standard document detection means is detected by the special document detection lever, the standard document detection means is turned on, and the special paper size of the special paper loaded on the special document stacking table is set by the paper feed roller. The original can be transported for image formation.

[0021]

EXAMPLES Examples of the present invention will be described in detail below.

FIG. 1 shows a document feeder 1 of the present embodiment. This document feeder 1 is arranged on a document table 41 of an electronic copying machine 40 which is an image forming apparatus.

The automatic document feeder 1 shown in FIG. 1 is provided with an original stacking table 2 on the main body 1A for loading standard size originals D such as B5 plate, A4 plate, B4 plate and A3 plate. A side guide 3 that is slidably mounted in the width direction of the document D with respect to the document feeding table 2 and that regulates both sides (both sides in the width direction) of the document D is detachably attached to the document feeding table 2. It has a special document stacking table 5 on which a document D1 of a special paper size to be loaded is stacked, and a jam processing lid 4 provided in front of the document stacking table 2.

Inside the apparatus main body 1A, as shown in FIG. 1, a paper feed section 6 for feeding the original D or D1 and a belt or roller for conveying the original D or D1 on the original table 41 are provided. The used document transporting unit 30 and a not-shown discharge reversing unit provided on the opposite side of the sheet feeding unit 3 with the document transporting unit 30 interposed therebetween are provided.

The paper feeding section 6 is provided with a document D from the document stacking table 2.
Alternatively, there are provided a paper feed roller (pickup roller) 7 for taking out D1 one by one, a paper guide 8, a shutter 9 for regulating the position of the front end of the document, and a standard document detecting means 10 for detecting the presence or absence of a standard size document D. The standard document detection lever 11 which constitutes the document, the transport roller group 12 which transports the document D or D1 taken out by the paper feed roller 7 along the paper guide 8, and the document D or D1 on the document table 41 of the electronic copying machine 40. It has an aligning roller group 13 which is conveyed toward the side.

The special document stacking table 5 will be described in detail with reference to FIGS. 2 to 4.

The special document stacking table 5 has a rectangular main frame 15 serving as a casing, and a pair of rollers 16 and two rollers 16 for transporting a special paper size document D1 such as a postcard to the paper feed roller 7. Is provided with a pair of transport roller brackets 18 on which the transport belt 17 is installed. The roller 16 is rotated to guide the document D1 to the paper feed roller 7, so that the rotational force of the motor 19 is passed through the driving pulley 20 and the belt 21. And is transmitted to one roller 16. The power supply of the motor 19 is performed from the apparatus main body 1A side via a cable and a connector. Then, the control unit (not shown) of the apparatus main body 1A is made to recognize that the motor 19 of the special document stacking table 5 is connected using the cable and the connector.

The special document stacking table 5 is provided with a document D1.
It has a pair of side wall plates 20 that can be displaced according to the width, and a pair of racks 21 and pinions 22 that adjust the width of the pair of side wall plates 20.

Further, the special document stacking table 5 is provided with a special document detection mechanism section 23 for detecting stacking of a document D1 of a special paper size.

The special document detecting mechanism portion 23 penetrates the support plate 20a at a position near the paper feed roller 7 with respect to the support plate 20a standing on the extension line of the one side wall plate 20, and , The support shaft 24 rotatably arranged along the width direction of the document D1, and the support shaft 2 on the inner surface side of the support plate 20a.
4, one end is attached to the paper feed roller 7
And a transmission member 26 supported by a support shaft 24 on the outer surface side of the support plate 20a so as to be close to the lower side of the standard document detection lever 11. When D1 is loaded, the special document detecting lever 25 comes into contact with the leading end of the document D1 and is displaced, and this displacement is transmitted to the transmitting member 26 via the support shaft 24, and this transmitting member 26 causes the standard document detecting lever 11 to move. Is turned to turn on the standard document detection means 10 (the document D1 is present)
It is supposed to be in a state.

In FIG. 2 and FIG. 3, 27 is a fixed stud for mounting the special document stacking table 5 on the basis of the center of the document stacking table 2 in the width direction.

Next, the operation of the document feeder 1 will be described with reference to FIG.
The details will be described with reference to FIG.

According to this document feeder 1, the B5 plate, the A
When a standard size document D such as 4th plate, B4 plate, A3 plate, etc. is loaded on the standard size document stacking table 2, as shown in FIG. 6, a standard document detecting lever constituting standard document detecting means 10 is formed. 11, the standard document detection lever 11 is displaced in the direction of arrow a, and the standard document detection means 10 is turned on.

As a result, the standard size document D stacked on the document stacking table 2 by the sheet feeding roller 7 can be conveyed for image formation.

Further, in the state shown in FIG. 4 in which the special document stacking table 5 is mounted on the document stacking table 2 using the fixing studs 27, a special paper size document such as a postcard is placed on the special document stacking table 5. When D1 is loaded, the special document detecting lever 25 of the special document detecting mechanism 23 provided at a position facing the outer periphery of the paper feed roller 7 on the special document stacking table 5
Is displaced in the direction of arrow a, and the transmission member 2 is moved through the support shaft 23.
3 transmits the displacement of the special document detecting lever 25 to the standard document detecting lever 11 of the standard document detecting means 10 to turn on the standard document detecting means 10.

As a result, since the standard document detecting lever 11 cannot be arranged in the vicinity of the paper feed roller 7, the special document size document D1 such as a check or a postcard which cannot be directly detected by the standard document detecting means 10 is detected by the special document detecting lever. 25, the standard document detecting means 10 is turned on, and the special paper size document D1 loaded on the special document loading table 5 by the paper feed roller 7 can be conveyed for image formation.

When the original D1 of a special paper size is loaded on the special original loading table 5 and the presence or absence of the original D1 is detected, and then the conveyor belt 17 is driven by the motor 19, only the first feeding is performed. If the special original D1 is driven to the paper feed roller 7 by driving at the same speed as the paper feed roller 7,
Manuscript exchange time can be maintained.

Further, since the conveying belt 17 does not apply a pressing force from above, the moving speed of the conveying belt 17 is decreased after the first sheet feeding to prevent the sheet jam, and the conveying belt 17 is always kept. Rotate the original D up to the paper feed roller 7.
1 may be transported.

[0039]

According to the first aspect of the present invention, in addition to being able to convey a standard size document for image formation, a standard document detection mechanism section is used to detect the standard document by using a special document stacking table. By operating the means, it is possible to provide a document feeder that can convey a document of a special paper size for image formation.

According to the second aspect of the invention, in addition to being able to convey a standard size document for image formation, a special document stacking table is used and a special document detection lever of a special document detection mechanism section is provided. By operating the standard document detecting means by the transmission member, it is possible to provide a document feeding device capable of transporting a document of a special paper size for image formation.

According to the third aspect of the present invention, in addition to being able to convey a standard size document for image formation, a special document stacking table is used, and a special document detection lever of a special document detection mechanism section, By operating the standard document detecting means by the transmitting member, it is possible to provide a document feeding device that can also transport a document of a special paper size that cannot be detected by the standard document detecting means for image formation.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of a special document stacking table in the apparatus according to the embodiment of the present invention.

FIG. 3 is a plan view of a special document stacking table in the apparatus according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing the operation of the special document stacking table of the apparatus according to the embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view showing the operation of the apparatus of the embodiment of the present invention when the special document stacking table is not attached.

FIG. 6 is a schematic perspective view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Document feeder 2 Document stacking table 5 Special document stacking table 10 Standard document detecting means 23 Special document detecting mechanism section 25 Special document detecting lever 26 Transmission member D, D1 document

Claims (3)

[Claims] 1. A document stacking table on which a document of a standard size is stacked, and a document placed on the document stacking table, which is arranged at the front end region of the document stacking table with reference to the center in the width direction of the document, is conveyed for image formation. And a standard document detecting means arranged on the side of the paper feeding roller in the front end area of the document stacking table for detecting the presence or absence of a standard size document, and attached / detached on the basis of the center of the document stacking table in the width direction. A special document stacking table for stacking a special paper size document that can be placed, and a displacement provided in response to stacking of a special paper size document provided on this special document stacking table, and the displacement is transmitted to the standard document detecting means. An original feeding device having a special original detection mechanism section that operates. 2. A document stacking table on which a standard size document is stacked, and a document placed on the document stacking table at the front end region of the document stacking table with the center in the width direction of the document as a reference is conveyed for image formation. And a standard document detecting means arranged on the side of the paper feeding roller in the front end area of the document stacking table for detecting the presence or absence of a standard size document, and attached / detached on the basis of the center of the document stacking table in the width direction. The special document stacking table for stacking special paper size originals that can be placed, the special original document detection lever provided on this special original document stacking table and displaced by the stacking of special paper size original documents, and the displacement of this special original document detection lever A document feeding device comprising a special document detection mechanism section including a transmission member that transmits the standard document detection means to turn on the standard document detection means. 3. A document stacking table on which a document of a standard size is stacked, and a document placed on the document stacking table at the front end region of the document stacking table with the center in the width direction of the document as a reference is conveyed for image formation. And a standard document detecting means arranged on the side of the paper feeding roller in the front end area of the document stacking table for detecting the presence or absence of a standard size document, and attached / detached on the basis of the center of the document stacking table in the width direction. A special original stacking table for arranging a special paper size original that can be placed, and a special original that is provided at a position facing the outer circumference of the paper feed roller on the special original stacking table and is displaced by stacking the special paper size original It is characterized by having a detection lever and a special document detection mechanism section comprising a transmission member for transmitting the displacement of the special document detection lever to the standard document detection means to turn on the standard document detection means. Document feeder to collect.