JPH10316276A - Paper carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper carrying device capable of sufficiently correcting skew is transfer paper. SOLUTION: A device is provided with resist rollers 7, 8 disposed in a carrying passage of transfer paper 100, a first carrying roller 4 disposed on the upstream side of the resist rollers 7, 8 and fixed on a support shaft 12 to be disposed roughly at a center of a width of the transfer paper, and second carrying rollers 1, 2 to release the transfer paper 100 from a held condition before loosening is given to the transfer paper 100 before the resist rollers 7, 8. As the single first carrying roller 4 is used, the transfer paper 100 is easily rotated around the first carrying roller 4, so freedom degree of move of the transfer paper 100 is increased, thereby skew in the transfer paper 100 can be sufficiently corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper transport device which transports a transfer paper and corrects a skew state (skew state) of the transfer paper.

[0002]

2. Description of the Related Art A conventional paper transport apparatus of this type is shown in FIG. 3 in which a transfer force for the transfer paper 100 is provided and the transfer paper 100 is transported along a transport path.
The following configuration is used to correct the skew state (skew). That is, the leading end 10 of the transfer paper 100
1 is pressed strongly against the registration rollers 103, 103, and the two conveyance rollers 105, 105 are supported in order to correct the oblique feeding state of the transfer paper 100 generated upstream in the conveyance direction of the registration rollers 103, 103. The transport rollers 105 are mounted on a shaft 107 and are spaced apart from each other on the support shaft 107 at a predetermined span.

[0003]

However, even if the transfer paper 100 is slackened in front of the registration rollers 103, 103 to correct the skew of the transfer paper 100, the registration rollers 103, 103 and the transport rollers located upstream thereof are required. If the distances to the transfer rollers 100 and 105 are not sufficient, the transfer paper 100 cannot be slack enough to correct the skew of the transfer paper 100 that has hit the registration rollers 103 and 103. That is, the two transport rollers 105 press the transfer paper 100 at the time of skew correction.
There is a problem that the degree of freedom of movement of the transfer paper 100 for skew correction is reduced, and sufficient skew correction cannot be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a paper conveying apparatus capable of sufficiently correcting skew of transfer paper.

[0005]

According to a first aspect of the present invention, there is provided a paper transporting apparatus adapted to transport a transfer sheet to correct the state of the transfer sheet being skewed, and to dispose the transfer sheet in a transfer path of the transfer sheet. A registration roller, and a first conveyance roller disposed substantially at the center in the width direction of the transfer paper to be conveyed on the support shaft on the upstream side of the registration roller;
A second transport roller disposed upstream of the transport roller and releasing the transfer paper from a state where the transfer paper is sandwiched when the transfer paper is slackened in front of the registration roller. .

According to the first aspect of the present invention, since one first transport roller is used, the transfer paper rotates around the one first transport roller in order to correct the oblique feeding state of the transfer paper. As a result, the degree of freedom of movement of the transfer paper is increased, and the transfer paper can easily follow the registration rollers.

According to a second aspect of the present invention, in the first aspect of the invention, the second transport roller has a length in the transport direction of the transfer paper when the transfer paper slackens before the registration roller. If the transfer paper is short and the end of the transfer paper is not pinched by the second conveyance roller even when the transfer paper comes into contact with the registration roller, the second conveyance roller is in a pressure holding state and has a length in the conveyance direction of the transfer paper. If the transfer paper is long and the end of the transfer paper is pinched by the second conveyance roller even when the transfer paper comes into contact with the registration roller, the second conveyance roller presses the transfer paper from the state where the transfer paper is interposed. It is characterized by comprising means.

According to the second aspect of the present invention, since one first transport roller is used, the transfer paper is rotated about one first transport roller in order to correct the oblique feeding state of the transfer paper. As a result, the degree of freedom of movement of the transfer paper is increased, and the transfer paper can easily follow the registration rollers.

Further, when the transfer paper is slackened in front of the registration roller, the pressing means of the second conveyance roller has a short length in the conveyance direction of the transfer paper, so that the transfer paper may contact the registration roller. When the end of the transfer sheet is not pinched by the second transfer roller, the second transfer roller keeps a pressurized state, and the length in the transfer direction of the transfer sheet is long. Also, when the end of the transfer paper is sandwiched between the second transport rollers, the transfer paper is released from the state where the transfer paper is sandwiched. Correction processing (skew correction) of a slanting feed state can be performed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a paper transport apparatus according to the present invention. This paper transport apparatus can control the position of the transfer paper 100 by synchronizing the paper transport with other processes, And so on. This paper transport device includes a paper transport path 90.

In FIG. 1, a pair of conveying rollers 1 and 2, a pair of conveying rollers 4 and 5, and a pair of registration rollers 7 and
8 are arranged. A registration sensor 9 is disposed near the upstream side of the registration rollers 7 and 8.

The transport rollers 1 and 4 of the transport rollers 1 and 2 and the transport rollers 4 and 5 are drive rollers, and are driven to rotate by a drive source (not shown). The transport rollers 2 and 5 are driven rollers. The transport roller 2 is pressed against the transport roller 1 by the springs 2a and 2b of the link member 10, and the link member 10 is provided with a link driving unit 3 as a pressing means for the second transport roller. By the operation of the link driving unit 3, the state in which the transport roller 2 is pressed against the transport roller 1 can be maintained, or the transport roller 2 can be released from the transport roller 1.

Similarly, the conveying roller 5 is connected to the link member 1.
The springs 5 a and 5 b press the transfer roller 4. The link member 11 is provided with a link drive unit 6. The link drive unit 6 causes the transfer roller 5 to move. Maintaining the pressurized state,
The transport roller 5 can be released from the transport roller 4.

Characteristically, as shown in FIG. 2, the transport roller 4 and the transport roller 5 each have one support shaft 1.
2 and 13, wherein one transport roller 4 is fixed to a substantially intermediate portion of the support shaft 12, and the other transport roller 5 is fixed to a substantially intermediate portion of the support shaft 13. These one transport roller 4 and one transport roller 5 are, for example, elastic rubber rollers.

In FIG. 1, the paper transport path 90 for the transfer paper 100 has been described.
It also has. In the paper transport path 95, from the downstream side to the upstream side, the registration rollers 7, 8 and the transport rollers 4, 5,
Then, the paper feed rollers 21, 22, near the paper feed tray 98
23 are arranged.

Next, the operation of the paper transport device will be described. The paper transport device is provided with information on the length in the transport direction of the transfer paper 100 transported to the paper transport path 90 according to a command from the control unit of the main body. Based on this information, the paper transport device starts a paper feeding operation. Transfer paper 100
Are transport rollers 4 and 5 on the downstream side by transport rollers 1 and 2.
Sent to When the link driving units 3 and 6 operate, the transport rollers 2 and 5 that are driven rollers are in contact with the transport rollers 1 and 4 that are drive rollers.

The leading end 101 of the transfer paper 100 shown in FIG.
After passing through the conveying rollers 4 and 5 and being detected by the registration sensor 9 shown in FIG. 1, the driving of the conveying rollers 4 and 5 is stopped after a predetermined time from contact with the registration rollers 7 and 8. As this time, it is preferable that the transfer paper 100 be able to secure enough slack to correct the skew.

Since the one transport roller 4 and the one transport roller 5 are fixed to the support shafts 12 and 13, respectively, the transfer paper 100 controls the one transport roller 4 and 5 for the following reason. Easy to rotate as the center, transfer paper 10
The degree of freedom of movement of the transfer paper 100 is increased, and sufficient skew correction of the transfer paper 100 can be performed.

That is, when the transfer paper 100 enters the registration rollers 7 and 8 in a skewed state, as shown in FIG. 2, the end (D Side) is increased. The slack is greater on the B and D sides of the leading end of the transfer paper 100 that has entered the registration rollers 7 and 8 because they reach earlier than the A and C sides. When the D side of the transfer paper 100 is loosened and loses the degree of freedom to bend in contact with the upper guide plate 30 shown in FIG. Can be secured, and the transfer paper 100 is transferred to the registration rollers 7 and 8.
And the skew is effectively corrected. At this time, the transfer paper 100 is rotated more effectively by releasing the pressure of the transport rollers 1 and 2 upstream of the transport rollers 4 and 5.

On the other hand, in the conventional paper transport apparatus shown in FIG. 3 which is shown in comparison, when the D1 side of the transfer paper 100 slacks first, the C1 side is on the upper guide plate 30 and the lower guide plate 3 on the C1 side.
Even if the transfer paper 100 is full, the two transfer rollers 105 are provided for one support shaft 107 even if the transfer paper 100 is full.
, The transfer paper 100 cannot rotate properly, and the copying of the transfer paper 100 onto the registration rollers 7, 8 must be absorbed only by the D1 side and the C1 side downstream from the transport rollers 105, 105. The skew correction of the transfer paper 100 cannot be performed effectively.

In the above-described paper transport device, the operation of the transfer paper 100 of any length can be changed by changing the operation depending on whether the length of the transfer paper in the transport direction is short or long.
Skew correction can be reliably performed. That is, the transfer paper 10 is positioned before the registration rollers 7 and 8.
When the transfer paper 100 is slackened, the length of the transfer paper 100 in the transport direction is short, and the transfer paper 100 is
When the end of the transfer paper 100 is not pinched between the transport rollers 1 and 2 even when the transfer roller 100 contacts the transport rollers 1 and 2, the transport rollers 1 and 2 are maintained in a pressurized state by the link driving unit 3.

On the other hand, when the length of the transfer paper 100 in the transport direction is long and the end of the transfer paper 100 is pinched between the transport rollers 4 and 5 even when the transfer paper 100 comes into contact with the registration rollers 7 and 8. Indicates that the link driving unit 3 is operated and the transfer paper 10
The transfer paper 100 is released from the state in which “0” is sandwiched.

By doing so, the transport rollers 4, 5
Is released, the distance from the registration rollers 7 and 8 to the conveying rollers upstream thereof is increased, thereby increasing the degree of freedom of the transfer paper 100 to bend and effectively improving the skew effect. I do.

By the way, the present invention is not limited to the above-described embodiment, and the paper conveying device can be applied to an image forming apparatus other than a copying machine and a printer.

[0025]

According to the first aspect of the present invention, one first
Since the transfer rollers are used, the transfer paper is easily rotated about one first transfer roller to correct the obliquely fed state of the transfer paper, so that the transfer paper can be moved more freely. Therefore, it is possible to perform the correction processing (skew correction) of the transfer paper in a sufficiently skewed state, which is easy to follow.

According to the second aspect of the present invention, since one first transport roller is used, the transfer paper is easily rotated around one first transport roller in order to correct the oblique feeding state of the transfer paper. In addition, the degree of freedom of movement of the transfer sheet is increased, and the transfer sheet can easily follow the registration rollers, so that a sufficient correction processing (skew correction) of the transfer sheet in a skewed state can be performed. And the second
When the transfer roller pressurizes the transfer paper before the registration roller, the transfer paper has a short length in the conveyance direction when the transfer paper is slackened. When the transfer sheet is not caught between the transfer rollers, the second transfer roller maintains a pressurized state, and the length of the transfer sheet in the transfer direction is long. When the transfer sheet is nipped, the transfer sheet is released from the state in which the transfer sheet is nipped, so that the transfer sheet can be sufficiently obliquely fed regardless of the length of the transfer sheet. (Skew correction).

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an embodiment of a paper transport device of the present invention.

FIG. 2 shows a pair of registration rollers of the paper transport device of FIG. 1;
It is a perspective view which shows one conveyance roller.

FIG. 3 shows a pair of registration rollers of a conventional paper conveying device;
FIG. 4 is a perspective view illustrating two transport rollers.

[Explanation of symbols]

1, 2nd transport roller 3 link drive section (2nd
Pressurizing means of conveying roller) 4,5 First conveying roller 7,8 Registration roller 12,13 Support shaft 100 Transfer paper

Claims (2)

[Claims] And a registration roller disposed on a transfer path of the transfer sheet, wherein the registration roller is disposed on a transfer path of the transfer sheet. One of the first papers disposed substantially at the center in the width direction of the transfer paper to be conveyed on the support shaft
A transport roller, and a second transport roller disposed upstream of the first transport roller and releasing the transfer paper from a state where the transfer paper is sandwiched when the transfer paper is slackened before the registration roller. A paper transport device, comprising: And a second transporting roller which, when slackening the transfer paper in front of the registration roller, has a short length in the transporting direction of the transfer paper so that the transfer paper abuts against the registration roller even if the transfer paper abuts on the registration roller. When the portion is not sandwiched between the second transport rollers, the second transport roller is in a pressure holding state, and has a long length in the transport direction of the transfer paper. 2. The paper transporting device according to claim 1, wherein when the end portion is sandwiched between the second transporting rollers, the second transporting roller includes a pressing unit that releases the transfer paper from a state where the transfer paper is sandwiched. apparatus.