JPH0777939B2 - Paper width aligner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device provided with a skew roller, and in particular, is configured to be able to release a sheet nip in a conveying roller device before and after the skew roller. By doing so, the present invention relates to a device that enables the skew correction operation by the skew roller to be easily performed in a short distance.

(Prior Art) In an apparatus using a cut sheet such as a copying machine, transfer of an image while the sheet is conveyed along a sheet conveying path,
Fixing and other processes are continuously performed.

In the apparatus as described above, a skew correction device is provided in the middle of the conveyance path in order to set the position of the paper in the image transfer section or to position the document on the platen cover. A means is used in which a sheet or an original is conveyed toward the next step in a state of being aligned with a registration line set by a side guide or the like by a skew roller or the like.

For the purpose described above, FIG. 5 shows that a side guide 5 and a skew roller 4 are provided on the side of the sheet conveying path, and the front conveying roller device 2 and the rear conveying roller device 2 are provided at the front and rear portions of the side guide 5. There is shown a device which is provided with a conveyance roller device 3 and can perform a skew correction operation by the skew roller.

In this skew correction device, the sheet 1 conveyed on the sheet conveyance path by the front conveyance roller device 2 is separated from the nip portion by the front conveyance roller device 2 and then the skew correction action by the skew roller 4 is applied to the sheet 1a. To the
The paper 1a is transferred in a state where the side surface of the paper 1a is in contact with the side guides 5, and the paper 1b whose registration is completed is transferred toward the post-conveyance roller device 3.

Therefore, in the sheet conveying path configured as described above, the skew correction by the skew roller 4 is performed, so that the sheet or the document is positioned in the next step while being positioned along the side guides. Then, the image is transferred to each of them and a predetermined image is processed.

(Problems to be Solved by the Invention) However, in the conventional device as described above,
The front transport roller device or the rear transport roller device, which is provided as a transport roller before and after the skew roller 4, is a device that nips and transports a sheet from above and below by a driving roller and a pinch roller. When the paper is nipped by the roller device or the post-conveyance roller device, the skew correction by the skew roller is not performed.

Therefore, in the skew correction device used conventionally, in order to normally perform the skew correction operation by the skew roller between the front and rear transport roller devices,
It is necessary to set a large interval between the transport roller devices so that the paper can be brought closer to the side guides.

For the above-mentioned reason, in the conventional paper conveyance path provided with the skew rollers, the section for providing the skew correction means needs to be long, so the paper conveyance path becomes long,
This complicates the configuration of the paper transport path,
This is a factor that hinders downsizing of copying machines.

(Object of the Invention) The present invention solves the above-mentioned drawbacks of the conventionally used apparatus. While the sheet is nipped by the skew roller, the nip by the transport roller apparatus before and after the sheet is nipped. An object of the present invention is to provide a device in which the skew correction function of the skew roller can be performed in a short section by being configured so that it can be released.

(Means and Actions for Solving Problems) In the sheet width aligning device of the present invention, the sheet conveying path is directed from the upper and lower guide plates and the upper and lower guide plates toward the inside of the sheet conveying path.
Conveying roller devices each provided with a roller protruding so as to nip a sheet, and skew rollers are provided between the conveying roller devices, and skew correction can be performed by the skew rollers. Related to the device.

Further, in the sheet width adjusting device of the present invention, one or both of the transport roller devices before and after the skew roller are configured to be swingable, and the pinch rollers of the transport roller devices are swingable. A drive device for swinging the roller is provided, and the pinch roller is swung according to the detection information of the sheet in the sheet transport path, so that the nip state of the sheet by the transport roller device can be released. .

With the configuration as described above, in the device of the present invention,
When the sheet is nipped by the skew roller and a skew correction action is performed, before and after the skew roller, or
Since the nip of one of the transport roller devices is released, the skew correction action of the skew roller is reliably performed even when the sheet is at the position of the transport roller.

Therefore, in the apparatus of the present invention, it is not necessary to provide a section for performing skew correction of the sheet at a position outside the nip portion of the sheet feeding roller apparatus, and therefore the sheet feeding path can be shortened. become.

(Embodiment) The configuration of the sheet width adjusting device of the present invention will be described with reference to the illustrated embodiment.

FIG. 1 shows the case of a skew correction device in a general paper conveyance path. In the illustrated sheet conveyance path, a front conveyance roller device 2 and a rear conveyance roller device 3 are provided in front of and behind the skew correction device provided with the skew rollers 4 and the side guides 5.

These front transport roller device and rear transport roller device are directed toward the paper transport path from the upper and lower guide plates and the holes provided in the guide plate, similarly to the paper transport path in a conventionally used copying machine. Then, the drive roller and the pinch roller are formed so as to project respectively, and the conveyance operation can be performed in a state where the rollers nip the sheet.

A retract type pinch roller device having a configuration as shown in FIG. 2 is provided for both or one of the front and rear transport roller devices 2 and 3 provided in the paper transport path shown in FIG. 10 are provided.

This retract type pinch roller device 10 has rollers 12 and 12 provided on a bracket 9 provided on an upper guide plate 7 forming a sheet conveying path, a roller holding plate 13 swingably provided via a shaft 14, and a roller holding plate 13. The lower part of the roller 12 is provided so as to project from the hole 8 formed in the guide plate 7 toward the inside of the sheet conveying path.

In the illustrated embodiment, the roller holding plate 13 that holds the roller is connected to the rod 16 of the solenoid 15 and is swingably provided about the shaft 14,
The shaft 11 of the roller 12 is provided so that the leaf spring 17 presses it. When the solenoid 15 is off, the pinch roller 12 is pressed by the pushing force of the leaf spring 17.
Is applied with a constant pressing force.

The retractable pinch roller device 10 of the present invention configured as described above causes the solenoid 15 to be operated by a command from the control device when a sheet is detected by a sensor provided at a predetermined position of the sheet conveying path. It is energized to retract the pinch roller.

Therefore, in the paper transport path shown in FIG. 1, when a retract type pinch roller device is provided for the front transport roller device 2 and a sensor is provided at the nip portion of the skew roller 4, the sensor detects the paper. Simultaneously with the detection, the nip by the front transport roller device 2 can be released, and the skew correction by the skew roller 4 can be performed.

In addition, in the front transport roller device 2 and the rear transport roller device 3,
When each retract type pinch roller device is provided, when the paper is detected by the sensor, the pinch rollers of the front conveyance roller device and the rear conveyance roller device are retracted, and the skew correction action is performed only by the skew roller 4. Once the trailing edge of the paper has passed the sensor, the solenoid will be turned off again.

By configuring as described above, in the device of the present invention, the front transport roller device and the rear transport roller device,
Even if they are arranged relatively close to each other, it is possible to surely perform the skew correction operation by the skew roller.

The embodiment shown in FIG. 3 shows an example in which the sheet width aligning device of the present invention is provided in the document conveying path. In this embodiment, the automatic document feeder is provided with a paddle feeder 21 and a retard pad 22 on a document tray 20 so that the document delivered by the feeder can be judged.

Then, in a document conveying path 25 provided subsequent to the document feeding device, a conveying roller device constituted by a conveying roller 26 and a retract type pinch roller device 27, a skew roller 28, and a conveying roller 29 and a retract type. A conveyance roller device is provided in combination with the pinch roller device 30. The document transport path 25 is configured as a curved transport path, and is a device configured to transport a document set on the upper part of the automatic document feeder toward a platen glass provided on the lower part thereof. .

Furthermore, at the end of the document transport path, a platen glass 35,
Platen belt 36 and registration device 37
The platen belt 36 conveys the document conveyed through the document conveying path 25, and the registration device 37 provided at the end of the platen glass 35 stops the document so that the image of the document can be read. I am trying to do it.

In the above-described document transport path 25 of the present invention, sensors 31, 32 are provided at the document introduction portion and the discharge end of the document transport path, respectively.
Is provided, and when the sensor 31 detects a document, the solenoids of the retract type pinch roller devices 27 and 30 are turned off, and the nip of the document by the transport roller is released.

Then, the skew correction action by the skew roller 28 is performed only by the skew roller. In the embodiment described below, the solenoid is turned on and off in the opposite manner to that shown in FIG.

After that, when the document is detected by the sensor 32, the solenoid of the retract type pinch roller device is turned on, the nip by the transport roller device is performed again, and the document can be transported toward the platen glass 35. . The operation of each component in the above-described device of the present invention is as shown in the timing chart of FIG.

In the timing chart shown in FIG. 4, the transport rollers 26 and 29 and the skew roller 28 are always driven, but after a predetermined time has elapsed since the sensor 31 was turned on (the original reaches the skew roller). After some time), the solenoid of the retractable pinch roller device is turned on to retract the pinch roller.

When the leading edge of the document is detected by the sensor 32, the solenoid of the retract type pinch roller device 30 is turned off, and the nip of the document is restarted. Further, the solenoid of the retract type pinch roller device 27 is turned off after a lapse of a predetermined time after the rear end of the document is detected by the sensor 31, so that the solenoid is prepared for the next document.

Therefore, when the sheet width adjusting device of the present invention is provided in the document conveying path, the distance of the document conveying path can be shortened.

Further, in the example in which the apparatus of the present invention is provided in the document conveying path, the retract type pinch roller device and its swinging mechanism are not limited to the example shown in the drawings, and in addition, a link having an arbitrary structure may be used. It is also possible to use a mechanism, use another driving member in place of the solenoid, and the like as needed.

(Effects of the Invention) Since the apparatus of the present invention has the above-described configuration, the skew of the paper or the like can be shortened at a shorter distance than the conventionally used paper transport path or document transport path. Since the correction can be performed, the mechanism of the copying machine can be simplified.

Further, the sheet width aligning device of the present invention is configured as a device that can easily perform sheet registration, and is affected by the transport roller device while performing skew correction by the skew roller. Since it does not occur, it is possible to prevent adverse effects on the paper,
The skew correction can be accurately performed even on thin paper.

[Brief description of drawings]

FIG. 1 is a plan view showing the structure of a sheet width-shifting device of the present invention, FIG. 2 is a perspective view showing the structure of a retract type pinch roller device, and FIG. 3 is an example when applied to a document conveying path. A side view and FIG. 4 are timing charts showing the operation of the apparatus of the present invention corresponding to FIG. 3, and FIG. 5 is a plan view showing the configuration of a conventional example. Reference numeral 1 in the figure: paper, 2 ... front transport roller device, 3 ... rear transport roller device, 4 ... skew roller, 5 ... side guide, 7
…… Upper guide plate, 8 …… hole, 9 …… bracket, 10 ……
Retract type pinch roller device, 11 …… gg, 12 …… Roller shaft, 13 …… Roller holding plate, 14 …… Solenoid,
16 ... Rod, 17 ... Leaf spring, 20 ... Original tray, 21 ...
Paddle feeder, 22 Retard pad, 25 Document transport path, 26 Transport roller, 27 Retractable pinch roller device, 28 Diagonal roller, 29 Transport roller, 30
...... Retract type pinch roller device, 31.32 …… Sensor, 35 …… Platen glass, 36 …… Platen belt, 37
...... Registration device.

Claims (1)

[Claims] 1. A sheet conveying path is provided with upper and lower guide plates, and rollers are respectively projected from the upper and lower guide plates into the sheet conveying path so that the sheet is conveyed while nipping the sheet between both rollers. An apparatus comprising a transport roller device and a skew correction device using a skew roller between the transport roller devices, wherein one or both of the transport roller devices before and after the skew roller are provided. The pinch roller of the device is configured to be swingable, and a drive device for swinging the pinch roller is provided so that the pinch roller can be swung according to the detection information of the sheet to release the nip by the transport roller device. A sheet width aligning device having the above-mentioned configuration.