JPH05213489A - Wall face collision type paper skew correction mechanism - Google Patents

Abstract

PURPOSE:To provide a wall face collision type paper skew correcting mechanism which is capable of correcting the skew without folding or wrinkling paper and advantageous in achieving miniaturization. CONSTITUTION:A pair of feed rollers 1 are disposed opposite to each other on the upper and lower sides of a conveyor passage P and the ends of paper sheets 2 fed into a skew correction space S by the feed rollers 1 are directed downward of the conveyor passage P by a guide member 3 and are then made to collide with a wall face 4 so that they are aligned and then the paper sheets 2 are lifted along with a receiving member 5 to the conveyor passage by a vertical movement drive means 6 and are fed toward the wall face by paper feed means 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device for an electrophotographic printer, and more particularly to a wall collision type skew correcting mechanism.

[0002]

2. Description of the Related Art Generally, a copying machine using a cart sheet,
2. Description of the Related Art It is known that, in a sheet conveying device used for a printer, a facsimile, etc., skewing of the sheet occurs due to deviation of the contact pressure between the sheet and the conveying roller, contact between the sensor and the sheet, and the like.

Further, when the sheet is skewed, a sheet jam may occur or the print position may be laterally shaken. Therefore, in the conventional sheet conveying apparatus, at the latest, the leading edge of the sheet is sent before the sheet is sent to the developing section. A skew correction mechanism for aligning the parts at a fixed position is provided.

An example of a conventional skew feeding correcting mechanism is shown in FIG.
There is a roller type as shown in FIG. 3 and a wall collision type as shown in FIG. The roller type sheet conveying device includes a rubber roller 101 and a metal roller 1 sandwiching a conveying path.
02, and the leading edge of the paper 103 is aligned by utilizing the slip between the metal roller 102 and the paper 103.

That is, when the sheet 103 is skewed,
Either the left or right end of the sheet 103 first enters between the rollers 101 and 102. Since the metal roller 102 has a weak carrying force, the leading speed of the sheet 103 is slower than the trailing end of the sheet 103 which is fed at a constant speed, and the sheet 103 is bent and the rollers 101 and 102 are bent. At the position of, the tips are aligned and sent to the end.

Further, the rollers 101 and 102 are stopped, the paper 103 is fed at a constant speed, the paper 103 is bent, and the leading ends thereof are aligned.
There is also one in which the paper 1 103 is rotated and the paper 103 is sent to the end.

The wall-collision-type skew feeding correction device throws the sheet 203 into the air by a pair of rollers 201 and 202, drops the sheet 203 while aligning the tip of the sheet 203 against the wall surface 104, and receiving the flat plate-like receiving member 205. The sheet 203 received by the sheet feeding means 206 is fed back between the pair of rollers 201 and 202 by the sheet feeding means 206, and is fed in the carrying-out direction by the direction changing claw 207.

[0008]

In the roller type skew correcting mechanism, when there is a large skew, the bending e of the sheet becomes too large and a crease may be formed. Further, since the rigidity (strength) of the paper is used, wrinkles are likely to occur when the paper flexure e occurs. In addition, when the rigidity of the paper is weak, buckling may occur at the leading end of the paper, resulting in a pleated shape.

On the other hand, the wall-collision-type skew correction mechanism can solve these problems because the leading edge positions of the paper are aligned by the inertial force of the paper, but the paper is switched back and sent, so that the entire apparatus is sent. As a result, there is a problem that it becomes large.

The present invention has been made in view of the above circumstances, and it is possible to perform skew correction without causing creases, wrinkles, creases, etc. on a sheet, and is advantageous in terms of size reduction. It is an object to provide a collision type skew correcting mechanism.

[0011]

In order to achieve the above object, the wall-collision-type skew correction mechanism according to the present invention is arranged, for example, as shown in FIG. A pair of feed rollers 1, a guide member 3 for turning the leading end of the sheet 2 fed into the skew feeding correction space S by the feed roller 1 downwardly of the conveyance path P, and a sheet 2 fed from the feed roller 1. A wall surface 4 that receives the leading edge from the feed roller 1 at a position that is farther than the longest sheet length and lower than the conveyance path P, a receiving member 5 that receives the sheet 2 whose tip has been received by the wall surface 4 below the conveyance path P, and a receiving member. An elevating and lowering drive unit 6 for elevating and lowering the member 5 between a receiving position for receiving the sheet 2 below the transport path P and a delivery position for receiving the sheet 2 on the transport path P, and a sheet received by the receiving member 5. Two Characterized in that it comprises a paper feed unit 7 to be sent to the wall surface 4 side.

[0012]

[Operation] In the present invention, after the sheet 2 is fed by the feeding roller 1, the sheet 2 is pressed by the guide member 3 and flies obliquely downward in the skew correction space S. This paper 2 is farther than the longest paper length from the feed roller 1,
It is received by the wall surface 4 at a lower position than that, and the leading edge of the paper 2 is aligned with the wall surface 4 due to the inertia of the paper 2. After that, the paper 2 is dropped onto the receiving member 5 located at the receiving position, and the receiving member 5 is moved up from the receiving position to the sending position to return the paper 2 to the transport path P, where the paper feeding means 7 is operated. As a result, the sheet 2 is sent to the wall surface 4 side.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wall collision type skew feeding correcting mechanism according to an embodiment of the present invention will be described below with reference to FIG.

This wall-collision-type skew correction mechanism is provided with a pair of feed rollers 1 vertically opposed to each other with the transport path P interposed therebetween at an appropriate position of the transport path P, and subsequently the transport is performed. A skew correction space S including a part of the path P and a space below the path P is set.

In the skew correction space S, a leaf-spring-shaped guide member 3 that changes the leading end of the sheet 2 sent into the skew correction space S by the feeding roller 1 to a position lower than the conveyance path P.
And a wall surface 4 that receives the leading edge of the sheet 2 fed from the feeding roller 1 at a position that is farther than the longest sheet length from the feeding roller 1 and lower than the transport path P, and the sheet 2 that has received the leading edge on the wall surface 4 is transported. A flat plate-shaped receiving member 5 is provided below the path P.

The receiving member 5 is provided so as to be able to move up and down around the rotation axis of the driving roller 1a below the feeding roller 1, and is driven by a solenoid 6 provided below the free end of the receiving member 5. It is done.

A driven roller 7a is rotatably supported on the receiving member 5 at a position separated from the drive roller 1a by a predetermined distance, and a belt 7b is wound around the drive roller 1a and the driven roller 7a.

Further, a pinch roller 7c is rotatably supported at an upper portion of the skew correction space S at a position corresponding to the guide plate 8 for guiding the sheet 2 on the upper side of the conveyance path P and the driven roller 7a of the guide plate 8. The driving roller 1a and the driven roller 7
a, the belt 7b and the pinch roller 7c, the receiving member 5
A sheet feeding unit 7 that sends the sheet 2 received by the sheet to the wall surface 4 side is configured.

Outside the wall surface 4 of the skew correction space S, a pair of upper and lower delivery rollers 9 with a conveyance path P interposed therebetween as required.
Further, an optical sensor 10 for detecting the leading edge or trailing edge of the sheet 2 is provided in front of the feed roller 1 of the transport path P, and the leading edge or trailing edge of the sheet 2 is provided immediately before the wall surface 4. A plurality of, for example, optical sensors 11 for detecting the sheet width are provided at appropriate intervals in the width direction of the sheet 2.

In FIG. 1, 10a is a light emitting element,
10b is a light receiving element, 11a is a light emitting element, and 11b is a light receiving element. In this wall surface collision type skew correcting mechanism, the feed roller 1 and the sheet feeding means 7 may be constantly operated, and the sheet 2 advances along the conveyance path P, and the tip thereof is detected by the sensor 10. You may make it start when it starts.

Further, the solenoid 6 may be shortened in the initial state so as to be positioned at the receiving position (shown by a solid line) of the receiving member 5, or may be extended in the initial state to extend the receiving member 5 to the delivery position. Position (shown in phantom diagram),
When the sensor 10 detects the leading edge of the sheet, the sheet may be shortened to lower the receiving member 5 to the receiving position. In short, the paper 2 is fed by the feeding roller 1 into the skew correction space S.
The receiving member 5 may be configured to be positioned at the receiving position when it is sent to.

The sheet 2 fed for skew correction by the feed roller 1 is turned obliquely downward by the guide member 3 and is thrown out into the skew correction space S. And
It flies to the wall 4 and the tip is received by the wall 4,
The tip is aligned with the wall surface 4 and falls onto the receiving member 5.

The sheet 2 is received by the recoil at a position slightly retracted from the wall surface 4 toward the feeding roller 1 side, but the belt 7
By being sent to the wall surface 4 side by b, the leading end of the paper 2 is surely aligned with the wall surface 4.

When the leading edge of the sheet 2 is aligned with the wall surface 4, at least two sensors 11 detect the leading edge of the sheet 2, and the solenoid 6 is extended based on this detection to receive the receiving member 5.
Rises from the receiving position to the sending position, the paper 2 is sandwiched between the driven roller 7a and the belt 7b, and the pinch roller 7c and sent to the sending roller 9 side. It is carried out.

It is preferable that the contact pressure of the guide member 3 with respect to the sheet 2 be made as small as possible in order to prevent the occurrence of skew when the receiving member 5 is raised to the delivery position. It is preferably set to about 100 to 200 g.

Further, when the rear end of the sheet 2 is detected by the sensor 11, the solenoid 6 can be shortened or can be kept extended as desired. According to this wall surface collision type skew feeding correction mechanism, the leading end of the sheet 2 is made to collide with the wall surface 4 and the leading ends are aligned, so that the force of pushing the sheet 2 from the rear does not act on the sheet 2. Therefore, since there is no fear that the sheet 2 is bent, it is possible to prevent the sheet 2 from being bent excessively and causing folds, wrinkles, folds, or the like.

Further, since the paper 2 is sent out in the same direction as the sending-in direction, the paper path P can be shortened and the paper carrying device can be downsized, and the direction changing claw 207 can be provided, as compared with the conventional wall collision type skew correcting mechanism. Can be omitted to simplify the configuration, and since it is not necessary to reverse the rollers, the configuration of the control device can be simplified.

Further, according to this wall surface collision type skew correcting mechanism, the sheet feeding means 7 is rotatably supported by the end portion of the receiving member 5 on the feeding roller 1 side, and the wall surface 4 side thereof. The driven roller 7a is rotatably supported by the receiving member 5, the belt 7b is wound around the drive / driven rollers 1a and 7a, and the belt 7b is rotatably above the conveyance path P in correspondence with the driven roller 7b. Since the supported pinch roller 7c is provided, by setting the positions of the driven roller 7a and the pinch roller 7c within the shortest sheet length from the wall surface, various lengths different from the shortest sheet length to the longest sheet length can be obtained. The sheet 2 can be surely skew-corrected and sent out from the skew-correction space S.

In the above embodiment, the delivery roller 9 is omitted, and the sheet 2 is directly transferred from the skew correction space to the transfer unit between the photoconductor or the transfer unit and the transfer unit by the paper feeding unit 7. It may be configured to be sent.

[0030]

As described above, according to the present invention, since there is no possibility that the sheet will be bent when the leading ends of the sheets are aligned, it is possible to prevent the sheet from being bent excessively and causing folds, wrinkles, folds, and the like.

Further, since the paper is sent out in the same direction as the feeding direction, the paper path can be shortened to downsize the paper carrying device, and the direction changing pawl can be omitted to simplify the construction and to reverse the rollers. Since the above is eliminated, the configuration of the control device can be simplified.

In the present invention, in particular, the paper feeding means is
A pair of rollers rotatably supported respectively on the end of the receiving member on the feed roller side and on the wall surface side thereof, a belt wound around both rollers, and a conveyance path corresponding to the roller on the wall surface side. If a pinch roller rotatably supported on the upper side of the wall is installed, the position of the roller on the wall side and the pinch roller should be set within the shortest paper length from the wall surface so that Various sheets having different lengths can be surely skew-corrected and sent out from the skew-correction space.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a perspective view showing the principle of a roller type conventional example.

FIG. 3 is a configuration diagram of a conventional example of a wall collision type.

[Explanation of symbols]

 1 Feeding Roller 1a Driving Roller 2 Paper 3 Guide Member 4 Wall Surface 5 Receiving Member 6 Elevating Driving Means 7 Paper Feeding Means 7a Driving Rollers 7b Belts 7c Pinch Rollers S Skew Correction Space P Conveyance Path

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Mizobuchi 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Within Fujitsu Limited (72) Yoshiji Atsumi 1015 Kamitadanaka, Nakahara-ku, Kawasaki, Kanagawa FUJITSU LIMITED Within

Claims (2)

[Claims] 1. A pair of feed rollers (1) arranged above and below the conveyance path (P), and a sheet (2) fed into the skew correction space (S) by the feed rollers (1). The guide member (3) that turns the leading edge of the paper to the lower side of the transport path (P) and the leading edge of the paper (2) fed by the feeding roller (1) is farther from the feeding roller (1) than the longest paper length. The wall (4) that receives at a position lower than the transport path (P) and the paper (2) that can receive the leading edge on the wall (4)
The receiving member (5) below the (P), the receiving position where the receiving member (5) receives the paper (2) below the transport path (P), and the paper (2) received on the receiving member (5). Elevating and lowering drive means (6) for elevating and lowering to the delivery position located on the transport path (P), and paper feeding means (7) for feeding the paper (2) received by the receiving member (5) to the wall surface (4) side A wall-impacting type sheet skew correcting mechanism, characterized by comprising: 2. The paper feeding means (7) comprises a receiving member (5).
A pair of rollers (1a) rotatably supported on the end of the feeding roller (1) side and on the side of the wall surface (4).
(7a) and belt (7b) wrapped around both rollers (1a) and (7a)
The wall surface according to claim 1, further comprising: a pinch roller (7c) rotatably supported above the transport path (P) corresponding to the roller (7a) on the wall surface (4) side. Collision type skew feeding correction mechanism.