JPH0597271A - Feed and sheeting carrying device - Google Patents

Abstract

PURPOSE:To prevent multiple sheet feed easily and completely when one sheet feed part accidentally works during sheet feed from the other sheet feed part in a sheet feeder carrying device which carries sheets from plural independent sheet feed parts through a common carrying passage. CONSTITUTION:There are provided a link roller 120 which is constituted from three rollers 121, 122, 123 at a sheet feed passage 106 from a body sheet feed part 101 and a sheet feed passage 114 from a manual sheet feed part 115. Besides, the sheet which is fed manually is stopped by rotating the driving roller 121 of the link roller 120 in one direction during sheet feed from the body, and the sheet which is fed from the body is stopped by rotating the driven roller 121 in the other direction during manual sheet feed to carry only the first sheet to a carrying passage 108 even when the sheet is double-fed from both the sheet feed part by an accident, thus preventing multiple sheet feed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine, a facsimile machine, a printer, etc., which feeds and conveys a sheet from both a main body sheet feeding section of a cassette or a tray and a manual sheet feeding section by one conveying path. The present invention relates to a paper transport device, and particularly to prevention of double feeding of paper.

[0002]

2. Description of the Related Art In a copying machine or the like, a main body paper feed section such as a cassette is provided inside the main body of the apparatus, and a manual paper feed section in which a manual feed table is set from outside the main body of the apparatus is provided. There is a type that can feed from both sides.

Conventionally, in this type of paper feeding / conveying device, the paper feeding paths from the main body paper feeding portion and the manual paper feeding portion merge into one feeding path, and the sheets from any of the paper feeding portions are common to the feeding path. Is configured to be conveyed to the image forming unit. The two paper feed units are arranged so that they can be fed independently of each other, so that even when the paper is fed from the main body paper feed unit, the paper does not enter in the manual paper feed unit. It is possible.

[0004]

However, in the above-mentioned prior art, since either of the main body paper feed portion and the manual paper feed portion can be fed in advance, either one of them can be fed. Although it is possible to normally feed and convey the sheet by a simple operation of selecting the sheet feeding, if the operator makes a wrong operation, the following problems occur. That is, if one of the main body paper feed unit and the manual paper feed unit is mistakenly actuated while the other paper feed unit is operated, the paper feed unit also feeds the paper from the paper feed unit at the same time. Papers are overlapped and conveyed, resulting in miscopy. Further, during the double feeding of paper, the risk of jamming due to unstable transportation increases. Further, in this case, there is a problem in that the sheets are largely misaligned and double-fed, or the sheets are not conveyed at a regular timing, so that the jam detection is activated to stop the copying operation.

The present invention has been made in view of this point, and in a paper feeding / conveying device that conveys paper from a plurality of independent paper feeding units through a common conveyance path, paper feeding from one paper feeding unit It is an object of the present invention to easily and surely prevent the sheets from being double-fed when the other sheet feeding unit is accidentally operated.

[0006]

To achieve the above object, according to the present invention, a paper feed path from a plurality of paper feed sections merges into one conveyance path, and paper is fed from any of the paper feed sections. In a paper feeding / conveying device configured to convey paper,
A relay roller provided in each of the paper feed paths from the respective paper feed units, and a drive means for controlling one of the relay rollers to rotate in the opposite paper feed direction when the other roller rotates in the paper feed direction. Be prepared.

[0007]

According to the above construction, when paper is fed from one of the main body paper feed portion and the manual paper feed portion, the relay roller in both paper feed paths prevents the other paper feed portion from feeding paper by the driving means. Therefore, even if a sheet is fed from one of the sheet feeding sections by mistake and the sheet is doubled from the other sheet feeding section, the subsequent sheet is prevented from advancing by the relay roller. , Only the paper from the previous paper feed section advances to the transport path, and it is possible to always copy normally.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. Referring to FIG. 1, the overall configuration of the copying machine will be described. Reference numeral 100 is an apparatus main body. Inside the apparatus main body 100, for example, a cassette 102 is set as a main body sheet feeding unit 101 and is stored in the cassette 102. Sheets S of a predetermined size are fed one by one by the calling roller 103, the paper feeding roller 104, and the reversing roller 105. Further, a manual feed table 116 is set as a manual feed unit 115 outside the apparatus main body 100, and the paper G placed on the manual feed table 116 is also called a calling roller 117, a paper feeding roller 118, and a reverse roller 11.
9 is used to feed paper.

The paper feed path 106 from the main body paper feed section 101 has a pair of transport rollers 107 and extends straight upward, and the paper feed path 114 from the manual paper feed section 115 extends substantially horizontally. 114 are joined together so as to be connected to one conveyance path 108, and a registration roller pair 109 is provided in this conveyance path 108. The registration roller pair 109 is stopped at the time of paper feeding, and is stopped by, for example, the main body paper feeding unit 101.
The paper S is skew-corrected by colliding the entire width of the leading edge of the paper S with the nip portion, and then the paper S is rotated at a predetermined timing to convey the paper S in synchronization with the image forming unit 110. ..

Therefore, in the above structure, the relay roller 120 is located at a position immediately before the two paper feed paths 106 and 114 merge.
Are arranged. In this relay roller 120, a drive roller 121 is arranged between the two paper feed paths 106 and 114 so that the drive roller 121 functions as one of the pair of transport rollers in either path. Route 1
The driven rollers 122 and 123 of 06 and 114 are pressed against each other to form three rollers. And the driving roller 121
Is rotated clockwise as shown by the solid line in the figure, the two driven rollers 122 and 123 rotate counterclockwise, and the drive roller 121 and one driven roller 122 in the sheet feeding path 106 of the main body sheet feeding direction. Although the sheet feeding is performed by rotating the sheet feeding device to the sheet feeding path 114, the driving roller 121 and the driven roller 123 on the other side rotate in the counter sheet feeding direction in the sheet feeding path 114 of the manual sheet feeding, and the sheet feeding is automatically blocked. Further, when the driving roller 121 rotates in the reverse direction, the two driven rollers 122 and 123 also rotate in the opposite direction, and in this case, the sheet feeding of the sheet feeding path 114 of the manual sheet feeding is allowed, and the sheet feeding path 106 of the main body sheet feeding Feeding is automatically blocked.

A drive control system of the relay roller 120 will be described. A drive roller 121 is connected to a motor 124 capable of forward and reverse rotation as a driving means. Further, a mode key 130 for selecting one of main body paper feeding and manual paper feeding, a copy key 131, and a paper sensor 1 for detecting the paper fed and conveyed.
The 32 signals are input to the control unit 133. The control unit 133 operates each of the sheet feeding units 101 or 115 by the signals of the mode key 130 and the copy key 131, and drives the motor 124 to rotate clockwise or counterclockwise.
In this case, while the sheet sensor 132 is detecting the sheet S or G, the motor 124 is held in the initial rotation state.

Next, the operation of this embodiment will be described. First of all, when copying with the main body paper feed, the mode key 13
When the main body paper feed mode is selected with 0 and the copy key 131 is operated, the main body paper feed unit 101 is operated by the control unit 133 and the paper S in the cassette 102 is fed to each of the rollers 103 to 105.
The sheet S is fed by the paper feed path 106 and reaches the relay roller 120. Further, in this case, the motor 124 is driven by the control unit 133 and the relay roller 12
0 rotates the driving roller 121 in the clockwise direction, and accordingly rotates the driven rollers 122 and 123 in the counterclockwise direction, and is controlled so as to prevent the paper feeding in the paper feeding path 114 of the manual paper feeding. Then, as long as the sheet sensor 132 detects the sheet conveyed, the relay roller 120 is held in this driving state.

Therefore, when the operator mistakenly selects the manual feed with the mode key 130 and operates the copy key 131 during the above-described main body feeding operation, the control unit 13 is operated.
3, the manual paper feeding unit 115 is operated, and the paper G on the manual paper feeding table 116 is doubly fed. By the way, in this case, since the rotation of the relay roller 120 is controlled as described above, the relay roller 120 is moved from the manual paper feeding unit 115 to the paper feeding path 11 thereof.
The paper that passed 4 and reached the relay roller 120 is the drive roller 1
21 and one of the driven rollers 123 are prevented from advancing by rotation in the direction opposite to the sheet feeding direction. In this way, even if it is misoperated,
Only the paper S in the paper feed path 106 of the main body paper feed is the relay roller 1
20 is further conveyed by the driving roller 121 and the other driven roller 122, and the registration roller pair 109 of the conveyance path 108
Then, the skew is corrected, and then the sheet is conveyed to the image forming unit 110 at a predetermined timing and normally copied.

When the manual feed mode is selected and copying is performed first, the paper is fed from the manual feed section 115. In this case, the motor 124 drives the relay roller 120 and the driven rollers 122 and 123. In contrast to the above, the rotation control is performed, and this state is maintained during sheet feeding and conveyance. Therefore,
If the sheet S is double-fed by mistake from the main body sheet feeding unit 101 during this copying operation, the sheet S will be blocked by the driving roller 121 and the driven roller 122 of the relay roller 120 in the same manner. Thus, also in this case, only the manually fed sheet G is conveyed to the pair of registration rollers 109 and thereafter, and is normally copied.

Although the embodiment of the present invention has been described above, the relay roller pair is independently arranged in each of the main body paper feed path and the manual paper feed path, and one of these relay roller pairs is fed. Rotation control may be performed on the other side and the other side may be rotated on the opposite side.

[0016]

As described above, according to the present invention,
In a paper feeding / conveying device that conveys paper from a plurality of independent paper feeding units through a common conveyance path, a relay roller is attached to each paper feeding path to prevent the paper from being accidentally doubly fed. Since the rotation is controlled in this manner, it is possible to reliably prevent double feeding of paper due to an erroneous operation. In addition, the prevention of double-feeding of paper eliminates miscopying and stabilizes paper transportation,
The malfunction of jam detection does not occur.

Since the relay roller is composed of a driving roller that also serves as one of the transport rollers of the two paper feed paths and two driven rollers, the structure is simple and the cost can be reduced. Since one drive roller can be rotated in the forward and reverse directions by the motor, the drive means and control can be simplified.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a sheet feeding / conveying device according to the present invention.

[Explanation of symbols]

 101 Main Body Paper Feeding Section 106 Paper Feeding Path 114 Paper Feeding Path 108 Conveying Path 115 Manual Paper Feeding Section 120 Relay Roller 124 Motor

Claims (3)

[Claims] 1. A paper feeding / conveying device configured so that a paper feeding path from a plurality of paper feeding sections merges into one transportation path, and paper can be fed and conveyed from any of the paper feeding sections. ，
A relay roller provided in each of the paper feed paths from the respective paper feed units, and a drive means for controlling one of the relay rollers to rotate in the opposite paper feed direction when the other roller rotates in the paper feed direction. A sheet feeding / conveying device comprising. 2. The relay roller includes a driving roller arranged to be conveyable between two sheet feeding paths, and a first driven roller arranged in one sheet feeding path in pressure contact with the driving roller. , Equipped with a second driven roller that is placed in pressure contact with the driving roller and arranged in the other paper feeding path, and automatically allows the paper feeding from one paper feeding path by the forward rotation and the reverse rotation of the driving roller. 2. The sheet feeding / conveying device according to claim 1, wherein the sheet feeding / conveying device is configured to prevent sheet feeding from the other sheet feeding path. 3. The paper feeding / conveying device according to claim 1, wherein one of the paper feeding units is a main body paper feeding unit and the other is a manual paper feeding unit.