JPH0986726A - Paper transport position adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a mechanism for preventing inclination of a paper sheet caused at the time of feeding a paper sheet in a printer or the like, in which a register roller is not used, the structure is simplified and the space is reduced. SOLUTION: A register plate 1 is rotatably fitted to a rotary shaft 4, and a paper. sheet 10 is collided with the register plate 1 to correct the inclination of the paper sheet. Rotary arms 2, 3 are disposed on the right and left ends of the register plate 1, whereby only when the paper sheet 10 pushes both the right and left arms 2, 3, stoppers 6, 7 engaged with the respective arms 2, 3 are pushed down to enable rotation of the register plate 1, so that the paper sheet 10 pushes the register plate 1 to pass. A recessed part 5 where the leading end of the paper sheet 10 is fitted is formed on the register plate 1 to prevent the leading end of the paper sheet 1 from being bent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying position correcting device for correcting the inclination of a sheet being conveyed by a printer or the like, and more particularly to a correcting device for forcibly correcting the sheet by hitting it against an obstacle.

[0002]

2. Description of the Related Art A conventional device of this type is disclosed, for example, in Japanese Examined Patent Publication No.
As described in Japanese Patent Laid-Open No. 1-1337, the sheet is pressed against a registration roller to correct the skew (oblique) of the leading edge of the sheet. Was carried and the skew was corrected while the paper was rotated.

[0003]

In the conventional registration mechanism, the registration roller itself uses a metal roller in order to eliminate the catch at the leading edge of the paper in order to bring the paper into contact with the registration roller for skew correction, and to rotate in contact with it. Since it has a rubber carrying roller, it is necessary to provide a rotating mechanism such as a gear, and it is difficult to reduce the size of the unit because it is necessary to secure a space for it. There is also a problem that the number of parts increases and the cost increases.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a rotatable resist plate disposed on a sheet conveying path so as to be orthogonal to the sheet conveying direction, and an arrangement position of the resist plate. Alternatively, detection means for detecting the leading edge of the sheet at at least two points on the extension line and a stopper for stopping the rotation of the registration plate are provided. At least 2 if the plate is stopped to block the transport of paper.
When the leading edge of the paper is detected at a location, the restraint of the resist plate is released and the paper is allowed to pass.

Further, according to the present invention, the movable resist plate is arranged on the paper conveying path so as to be orthogonal to the paper conveying direction, and the leading end of the paper is at least two positions on the position where the resist plate is arranged or its extension. Detecting means for detecting the
When the leading edge of the sheet is not detected at the location, the conveyance of the sheet is blocked by the resist plate, and when the leading edge of the sheet is detected at at least two locations, the resist plate is retracted to allow the sheet to pass.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. The paper transport position correction device of this embodiment is shown in FIG.
As shown in FIG. 2, for example, in a laser printer (electrophotographic printer), it is arranged in front of the recording unit and aligns the sheets supplied from the sheet feeding unit.

FIG. 1 is a perspective view of a sheet conveying position correcting device of this embodiment. A vertical resist plate 1 is arranged in the traveling direction of the sheet 10 and can rotate about a rotation axis 4. Arms 2 on both sides of the resist plate 1
3 is mounted on the rotary shaft 4, and the arms 2 and 3 are engaged with the stoppers 6 and 7, respectively. In addition, the stopper 6,
Reference numeral 7 is arranged so that the rotation of the resist plate 1 can be controlled. A concave portion 5 into which the leading end of the paper 10 fits is formed in a portion of the resist plate 1 that contacts the paper 10.

Resist plate 1 and arms 2 and 3
Is attached to the rotary shaft 4, but is formed such that a portion below the rotary shaft 4 is large, that is, each center of gravity is located below the rotary shaft 4. Therefore, the resist plate 1 and the arms 2 and 3 take such a posture that their lower portions are located below the rotation shaft 4 when not regulated by others.

2 and 3 are views for explaining the movements of the above-mentioned respective components, FIG. 2 is a view before the stopper is released by the paper 10, and FIG. 3 is a view after the stopper is released by the paper 10 (whichever is the case. Also shows the arm 2, stopper 6 and the like on one side). In FIG. 2, before the sheet 10 hits the resist plate 1, the resist plate 1 has stoppers 6 and 7.
The rotation is stopped by. Although the stoppers 6 and 7 try to rotate about the shafts 11 and 12 by the springs 8 and 9, respectively, they are stopped by the detents 13 and 14 so that their positions are constant. The arms 2 and 3 are engaged by their own weights with the stoppers 6 and 7, respectively, as shown in FIG.

The operation of the embodiment having the above configuration will be described. First, the sheet 10 is conveyed, and the tip of the sheet 10 is transferred to the arm 2.
When is pressed, the arm 2 rotates about the rotation shaft 4 and pushes down the stopper 6. The stopper 6 rotates around the shaft 11, and the portion engaged with the resist plate 1 is released,
The resist plate 1 can rotate. However, the rotation of the resist plate 1 is actually possible when the stoppers 6 and 7 on both sides are separated, that is, when the arms 2 and 3 on both sides are simultaneously pushed.

In the state where the sheet 10 is skewed and only one of the arms 2 and 3 is pushed, both the stoppers 6 and 7 are not released, and therefore the resist plate 1 cannot be rotated. Paper 10 by 1
Is blocked. At this time, since the leading end of the sheet 10 fits into the recess 5 of the resist plate 1, the leading end of the sheet 10 does not hit the resist plate 1 and bend in a direction perpendicular to the sheet advancing direction to lose the resist effect. In this way, even while the leading edge of the sheet is in contact with the registration plate 1, the transporting means (belt conveyor or the like) for transporting the sheet is moving, so that the posture of the sheet 10 is gradually corrected along the transport direction. .

FIG. 4 is a side view of the sheet 10 after passing through it.
Since the arm 2 is longer than the resist plate 1,
The sheet 10 is caught on the sheet 10 for a long time. Therefore, the resist plate 1 returns to its original position by its own weight first, and then the sheet 10 separates from the arm 2 and the arm 2 returns to its original position by its own weight, and the stopper is released. 6 and 7 are springs 8
Is returned to the position of detent 13. At this time, the stopper 6 comes to a position where the rotation of the resist plate 1 is stopped.

FIG. 5 shows a state in which the skew feeding of the sheet 10 is corrected by this apparatus in a slightly exaggerated manner. In FIGS. 5A and 5B, the sheet 10 is the resist plate 1
When the sheet is abutted against the sheet and the orientation is correct, and the orientation is correct as shown in FIG. 7C, the stopper is released and the resist plate 1 can be rotated. As shown in FIG. Pushes down the resist plate 1 and passes.

FIG. 6 shows a second embodiment of the present invention, in which the photosensors 18, 19 indicate that the arms 16, 17 are pushed.
Is detected and the solenoid 20 operates only when both arms 16 and 17 are pushed, and the stopper 21 that controls the rotation of the registration plate 15 is released.

7 and 8 show a third embodiment of the present invention.
The sheet 10 is conveyed between the conveyance guides 61 and 62, is abutted against the resist plate 63, and the sheet position is corrected. The resist plate 63 is constantly urged upward by a spring 64, and is stopped and positioned by a stopper 65. Sensors 66 and 67 (limit switches, photosensors, etc.) are arranged at positions where the sheet 10 abuts on the registration plate 63. When both the sensors 66 and 67 detect the leading edge of the sheet 10, the solenoid 68 operates. Pull down the resist plate 63, open the transport path, and
Pass 0. The gap A between the end of the transport guide 61 and the resist plate 63 may be set narrow (for example, 1 mm or less). Then, the paper 10 becomes the resist plate 6
Even if the sheet hits 3, the skew of the sheet is effectively corrected without bending the leading edge.

[0016]

As described above, according to the present invention,
Since the resist plate is used, it can be arranged without considering the positional relationship with other units as in the conventional gear drive, so that the space can be saved and the entire apparatus can be downsized. Further, since the number of parts can be reduced and the parts can be formed of molded products or the like, the unit price of the parts can be reduced and the cost can be reduced. In addition, by forming a recess in the resist plate, it is possible to prevent the leading edge of the sheet from swinging in the direction perpendicular to the sheet advancing direction.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

2A and 2B show a state before releasing the stopper of the apparatus of FIG. 1, in which FIG. 2A is a side view and FIG. 2B is a front view.

3 shows the apparatus of FIG. 1 after the stopper is released, (a) is a side view, and (b) is a front view.

FIG. 4 is a side view showing the apparatus of FIG. 1 after passing a sheet.

FIG. 5 is a diagram showing a process of correcting the orientation of skew paper.

FIG. 6 is a perspective view showing a second embodiment of the present invention.

FIG. 7 is a sectional view showing a third embodiment of the present invention.

8 is a perspective view of the resist plate of FIG.

FIG. 9 is a diagram showing a place where a paper transport position correction device is arranged in the printer device.

[Explanation of symbols]

 1,15,63 Registration plate 2,3,16,17 Arm 4 Rotation shaft 5 Recessed portion 6,7,21 Stopper 8,9 Spring 10 Paper 11,12 Shaft 13,14 Rotation stop 18,19 Sensor 20 Solenoid

Claims (5)

[Claims] 1. A rotatable resist plate disposed on a sheet conveying path so as to be orthogonal to the sheet conveying direction, and a leading edge of the sheet at at least two positions on which the resist plate is arranged or an extension thereof. Is provided, and a stopper for stopping the rotation of the resist plate is provided, and when the detecting means does not detect the leading edge of the sheet at the at least two locations, the stopper stops the resist plate to prevent A sheet conveyance position correction device, characterized in that the conveyance of a sheet is blocked, and when the leading edge of the sheet is detected at the at least two locations, the restraint of the resist plate is released and the sheet is passed through. 2. The resist plate is attached to a rotary shaft arranged orthogonally to the traveling direction of the paper, the detecting means includes an arm that rotates when the leading end of the paper comes into contact, and the stopper is the above-mentioned. The apparatus according to claim 1, wherein the restraint of the resist plate is released by rotating the arm. 3. The registration plate is attached to a rotary shaft arranged orthogonally to the traveling direction of the paper, and the detection means is rotatably attached to the rotary shaft to rotate when the leading end of the paper comes into contact. The apparatus according to claim 1, comprising a moving arm and a sensor that detects the rotation of the arm, and the stopper releases the restraint of the registration plate according to the output of the sensor. 4. The apparatus according to claim 1, wherein a concave portion is formed in a contact portion of the resist plate with the leading end of the sheet. 5. A movable resist plate arranged on a paper conveyance path so as to be orthogonal to the paper conveyance direction, and a leading edge of the paper is detected at at least two positions on the arrangement position of the resist plate or an extension thereof. Detecting means, and said at least 2 by said detecting means.
When the leading edge of the sheet is not detected at a location, the conveyance of the sheet is blocked by the resist plate, and when the leading edge of the sheet is detected at the at least two locations, the resist plate is retracted to allow the sheet to pass. Paper transport position correction device characterized by: