JPH0789645A - Paper width direction correcting mechanism fo paper sheet feeding device - Google Patents

Abstract

PURPOSE:To prevent the generation of wrinkles, jam, etc., on a paper sheet colliding with a side guide, which is a fault of a paper width direction correcting mechanism. CONSTITUTION:A paper width direction correcting mechanism is equipped with the reflection type sensors 13a and 13b for detecting that a paper sheet set on a side guide 2 is set parallel to the side guide, skew roller 3, the first solenoid 4 for setting the skew roller 3 in contact with the paper sheet, pair of transfer rollers 1a and 1b, the second solenoid 10 for releasing the pressing force of the transfer roller, and a sensor 14 which is installed in a paper sheet transfer passage on the downstream side of a transfer roller and detects the transfer of the paper sheet. Since the skew traveling force of the paper sheet on which the lateral resistance is corrected can be released, the generation of wrinkles, jam, etc., can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet width direction correcting mechanism of an image forming apparatus such as a copying machine, a printer or the like, or an intermediate tray of a copying machine, and more specifically, a conveying roller pair. The present invention relates to a sheet width direction correction mechanism of a sheet supply device provided with a side guide for correcting a lateral position shift (hereinafter referred to as lateral registration) along a sheet conveyance path.

[0002]

2. Description of the Related Art Conventionally, various types of paper width direction correcting mechanisms have been proposed. For example, the skew feed detection element is composed of a chip of multiple bits, the digital signal by this is processed, and the DC motors for rotating the intermediate conveyance rollers arranged on both sides of the paper are driven and controlled to correct the skew feed of the paper. Is surely done.

Further, in a device for feeding the paper with the center of the paper as a reference, a side guide for aligning the second surface at the time of printing is moved to a position according to the paper size, and the side edge of the paper is projected to the side guide. By applying it, the position of the paper is aligned accurately.

Further, the pressing force of the pressure member of the pair of appropriately selected conveying rollers is made variable to change the pressure balance between the left and right of the conveying rollers to correct the skew and lateral registration of the transfer paper and combine them. Alternatively, it has already been proposed to prevent image shift during double-sided copying.

[0005]

In each of the above-mentioned conventional proposals, if the front end and the rear end of the paper in the transport direction contact the side guide, it is determined that the paper is normally fed. There is a problem that the skewing force continues to act on the sheet, and the skewing force causes wrinkles, jams, and the like on the sheet abutted against the side guide.

An object of the present invention is to propose a paper width direction correction mechanism which solves the problems in the above-mentioned conventional proposals.

[0007]

According to the present invention, in addition to the above-mentioned side guide, the above-mentioned problem is solved by disposing a skew roller with respect to this side guide so that the side of the sheet in the traveling direction is the side guide. In a paper feeding device for aligning paper along a side, a first detection unit provided on the side guide for detecting that the paper is parallel to the side guide and the skew roller can be brought into contact with and separated from the paper. A first driving unit, a second driving unit that releases the pressure applied to the pair of conveying rollers, and a second detecting unit that is provided in a sheet conveying path downstream of the pair of conveying rollers and detects that the sheet has been conveyed. When,
This is solved by providing each of the drive means based on each of the detection means, and a control means for skewing the sheet to the side guide and interrupting the skewing.

Further, according to the present invention, the above-mentioned problem is a first detection for detecting that the paper provided in the side guide is parallel to the side guide in the paper feeding apparatus provided with the above-mentioned side guide. Means, a second detection means provided in a paper conveyance path downstream of the conveyance roller pair for detecting conveyance of a sheet, and a control means for receiving a detection signal of these detection means, The drive / conveyance roller of the pair is composed of two roller portions, and a shift means for changing the rotation speed of one roller portion is provided, and the control means controls the shift means on the basis of the detection signals from the detection means. The problem is solved by performing the skew feeding of the sheet to the side guide and the interruption of the skew feeding.

Further, according to the present invention, the above-mentioned problem is the first detection for detecting that the sheet provided in the side guide is parallel to the side guide in the sheet feeding apparatus provided with the side guide. Means, a second detection means provided in a paper conveyance path downstream of the conveyance roller pair for detecting conveyance of a sheet, and a control means for receiving a detection signal of these detection means, One of the pair of conveying rollers is composed of two roller portions, and a transforming means for varying the pressing force of the one roller portion is provided, and the control means controls the transforming means based on the detection signal of each of the detecting means. The problem is solved by performing the skew feeding of the sheet to the side guide and the interruption of the skew feeding.

[0010]

In the sheet feeding device having the sheet width direction correcting mechanism of the first aspect of the invention, when the sensor detects that the lateral registration of the sheet has been corrected, the skew feeding roller is separated from the sheet, and the sheet is skewed. Since the action is prevented from working excessively, the paper in contact with the side guides is sent forward without the edges of the paper being folded or wrinkled.

In the paper width direction correction mechanism of the second invention, when the sensor detects the correction of the lateral registration of the paper, the speeds of the left and right roller portions that were skewing the paper due to different rotation speeds become equal, and the paper speed becomes equal. Since the sheet is prevented from being excessively skewed, the sheet in contact with the side guides is sent forward without the edges of the sheet breaking or wrinkling.

In the paper width direction correction mechanism of the third invention, when the sensor detects the correction of the lateral registration of the paper, the roller portion whose pressure has been changed due to the skew of the paper becomes the original pressure again. As a result, the sheet is prevented from being excessively skewed, so that the sheet in contact with the side guides is sent forward without the edges thereof being bent or wrinkled.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

The sheet width direction correcting mechanism according to the first aspect of the invention shown in FIG. 1 is a pair of conveying rollers 1a, 1 arranged in a sheet conveying path.
b and side guides 2 installed along the paper transport path
Is equipped with. The skew roller 3 is arranged with respect to the side guide 2. The skew roller 3 is brought by a first solenoid 4 via a lever 5 and a supporting plate 6 into a position in contact with a sheet and a position separated from the sheet. further,
The skew roller 3 is rotationally driven by a gear system 7. 8
Is a fulcrum of the lever 5, and 9 is a spring that acts on the support plate 6 so as to bring the skew roller 3 to a position separated from the sheet.

Further, a second solenoid 10 is provided, and this solenoid 10 is connected to the shaft of the conveying roller 1b via a lever 11 and a spring 12, and the conveying roller pair 1 is connected.
It serves to release the pressing force of a and 1b. The pair of conveying rollers is driven and rotated by obtaining a driving force from a driving system (not shown). Further, the side guide 2 is provided with a reflection type sensor 13 at a position before and after the skew roller 3 in the sheet conveying direction.
a and 13b are arranged, and a sensor 14 is installed at a position that does not hinder the transportation of the paper within the range of the paper transportation path.

The conveyed sheet is conveyed by the pair of conveying rollers 1a and 1b in the direction of arrow F, passes through the pair of conveying rollers, and when the leading end thereof reaches the sensor 14, the second sheet is passed through a control means (not shown). The solenoid 10 is turned on, and the conveying roller pair 1b is pulled down via the lever 11 and the spring 12 to release the pressing force of the conveying roller pair. At the same time, the first solenoid 4 is turned on, and the lever 5 and the support plate 6 are
The skew roller 3 is brought to a position where it comes into contact with the sheet via the. As a result, as shown in FIG. 2, the sheet 17 ′ whose lateral position is not aligned is first skewed, and then the side guide 2 is followed to become the sheet 17 whose lateral registration has been corrected. Sent to. When the lateral registration of the sheet is corrected in this way, the leading end and the trailing end of the sheet come into contact with the side guide 2 and are detected by the reflection type sensors 13a and 13b. By this detection, both solenoids 4 and 10 are turned off via the control means. When the first solenoid 4 is turned off, the skew roller 3 is brought to a position separated from the sheet, and the skew action on the sheet is stopped, and when the second solenoid 10 is turned off, the conveying roller pair 1a and 1b are added. Therefore, the pressure is obtained, and therefore, the sheet is again conveyed to the conveying roller pair 1.
It is transported downstream by a and 1b.

Next, the sheet width direction correction mechanism according to the second invention of FIG. 3 will be described. In the figure, the same members as those of FIG. 1 are designated by the same reference numerals and the description thereof is omitted. .

Of the pair of conveying rollers 15 and 16 shown in FIG. 3, the conveying roller 16 which is a driving roller is composed of two roller portions 16a and 16b. The roller portion 16a is rotationally driven by a stepping motor 18, and the roller portion 16 is provided.
b is rotated by being driven by a drive system (not shown).
Normally, both roller portions 16a and 16b rotate at the same rotation speed, but the roller portion 16a can be driven at a higher rotation speed than the roller portion 16b by controlling the rotation of the stepping motor 18.

In the sheet width direction correction mechanism described above with reference to FIG. 3, when the sheet passes through the pair of conveying rollers 15 and 16 in the direction of arrow F and the leading edge of the sheet reaches the sensor 14, a control means (not shown) which receives the detection signal is received. By stepping motor 1
The rotation speed of roller 8 is faster, so that roller portion 16a rotates faster than roller portion 16b. As a result, the sheet skews toward the side guide 2, and the lateral registration is corrected by following the side guide 2. When the lateral registration is corrected in this manner, the leading edge and the trailing edge of the sheet come into contact with the side guide 2, and the reflective sensor 13
It is detected by a and 13b. This detection signal causes the rotation speed of the stepping motor 18 to return to its original value, so that the rotation speed of the roller portion 16a of the conveyance roller 16 becomes equal to that of the roller portion 16b, and the sheet whose lateral registration has been corrected is conveyed downstream.

In the paper width direction correcting mechanism of FIG. 3, the roller portion 16a of the roller portion of the conveying roller 16 which is separated from the side guide 2 is rotated at a higher speed. Roller part 16
It is of course possible to adopt a configuration in which the rotation speed of b is not slowed or stopped.

In the sheet width direction correction mechanism of the third invention shown in FIG. 4, the transport roller 2 of the transport roller pair 20, 21 is used.
1 comprises two roller parts 21a, 21b. Also,
A solenoid 22 is provided and is connected to the shaft of the roller portion 21b via a lever 23 and a spring 24.

The paper is conveyed in the direction of arrow F with a pair of conveying rollers 20, 2.
When the leading edge of the sheet reaches the sensor 14 after passing 1, the solenoid 22 is energized by the detection signal, and the lever 2
3 pulls down the roller portion 21b via the spring 24,
The pressing force between the roller portion 21b and the transport roller 20 is released. Therefore, the paper cannot be gripped in the range of the roller portion 21b of the joint portion of the pair of conveying rollers 20 and 21, and the paper slips in this range and is fed only in the range of the roller portion 21a. As a result, the sheet skews toward the side guide 2, and the lateral registration is corrected by following the side guide 2. When the lateral registration is corrected in this way, the leading edge and the trailing edge of the sheet are guided by the side guides 2.
And is detected by the reflective sensors 13a and 13b. Due to this detection signal, the urging of the solenoid 22 is interrupted, the pressure is returned to the range of the roller portion 21b, and the sheet whose lateral registration has been corrected is conveyed downstream.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a sheet width direction correction mechanism according to a first invention.

FIG. 2 is an explanatory diagram of a lateral registration correction action of the sheet in FIG.

FIG. 3 is a schematic perspective view of a sheet width direction correction mechanism according to a second invention.

FIG. 4 is a schematic perspective view of a sheet width direction correction mechanism according to a third invention.

[Explanation of symbols]

 1a, 1b; 15, 16; 20, 21 Conveying roller pair 2 Side guide 3 Oblique roller 13a, 13b Reflective sensor 14 Sensor 16a, 16b Roller part 21a, 21b Roller part F Paper conveyance direction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Nakao 1-3-6 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd. (72) Hiroshi Kawano 1-3-6 Nakamagome, Ota-ku, Tokyo Shares Inside Ricoh Company (72) Inventor Masataka Shimosako 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company, Ltd.

Claims (3)

[Claims] 1. A side guide for lateral registration correction is provided along a sheet conveying path in which a pair of conveying rollers is arranged, and a skew roller is arranged with respect to the side guide, and a side edge in the traveling direction of the sheet is the side guide. In a paper feeding device for performing alignment along a line, a first detection unit provided on the side guide for detecting that the paper is parallel to the side guide, and the skew roller can be brought into contact with and separated from the paper. And a second driving means for releasing the pressure applied to the pair of conveying rollers, and a second driving means provided in a sheet conveying path downstream of the pair of conveying rollers for detecting that the sheet has been conveyed.
A sheet width direction correction mechanism comprising: a detection unit; and a control unit that controls each of the drive units based on each of the detection units to skew the sheet to the side guide and interrupt the skew. . 2. A sheet feeding device provided with a side guide for lateral registration correction along a sheet conveying path in which a pair of conveying rollers is arranged, and detects that the sheet provided on the side guide is parallel to the side guide. Detecting means for detecting the fact that the sheet is conveyed, which is provided in the sheet conveying path downstream of the conveying roller pair, and control means for receiving the detection signals of these detecting means. A driving and transporting roller of the transporting roller pair is composed of two roller portions, and a shift means for varying the rotational speed of one roller portion is provided, and the control means is based on a detection signal from each of the detecting means. A sheet width direction correction mechanism, characterized in that a speed change means is controlled to perform skew feeding of a sheet to the side guide and interruption of the skew feeding. 3. A sheet feeding device provided with a side guide for lateral registration correction along a sheet conveying path in which a pair of conveying rollers is arranged, and detects that the sheet provided on the side guide is parallel to the side guide. Detecting means for detecting the fact that the sheet is conveyed, which is provided in the sheet conveying path downstream of the conveying roller pair, and control means for receiving the detection signals of these detecting means. One of the conveying rollers of the conveying roller pair is composed of two roller portions, and a transforming means for varying a pressing force of the one roller portion is provided, and the control means is based on a detection signal of each of the detecting means. A sheet width direction correction mechanism, characterized in that the transformation means is controlled to perform skew feeding of a sheet to the side guide and interruption of the skew feeding.