JPH0124697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper alignment device, and more particularly to a paper alignment device suitable for use in a copying machine.

2. Description of the Related Art In a copying machine, copy paper is fed to a paper alignment device including alignment rollers and pinch rollers, and is temporarily stopped there. In synchronization with the movement of the photoreceptor, which is a moving member on the downstream side, the paper held by the paper alignment device is sent to the photoreceptor. If the paper is aligned with the image area of the photoreceptor, it will properly receive the image; however, if the paper is skewed and out of alignment, it will not be properly oriented to receive the image.

In order to prevent this paper from skewing, that is, skew, it consists of an alignment roller and a pinch roller, which pinch the fed paper and feed the paper in an aligned state with respect to the downstream moving member. There is known a paper alignment device in which the axis of the pinch roller can be arranged at an angle to the axis of the alignment roller while the pinch roller is in pressure contact with the alignment roller (Japan Institute of Invention and Innovation, Publication No. 80−3972,
(See Vol. 5-22 (1980)).

This known sheet aligning device will be described with reference to FIGS. 1 to 5. The paper aligning device consists of an aligning roller 1 and a pinch roller 2, and is adapted to pinch the fed paper 3. The paper 3 is fed and stopped by both rollers 1 and 2, and in the copying machine, for example, alignment is performed in synchronization with the movement of a moving photoreceptor (not shown) disposed on the downstream side. The roller 1 is adapted to be rotationally driven.

As shown in FIG. 2, the rotation shaft 4 of the alignment roller 1
is fixed with respect to the main body of a machine such as a copying machine, but the rotation shaft 5 of the pinch roller 2 is mounted so that it can be arranged at an angle to the rotation shaft 4 of the alignment roller. In this case, it goes without saying that the pinch roller 2 rotates while being pressed against the alignment roller 1 in order to feed and stop the paper 3.

Figures 3 to 5 show the running of the paper 3 when the shaft 5 of the pinch roller 2 is rotated as shown in Figure 2.
This will be explained using figures. FIG. 3 shows the case where the axis 5 of the pinch roller 2 is aligned with the axis 4 of the alignment roller 1, and the paper 3 is fed in a direction perpendicular to both axes. On the other hand, as shown in Figure 4,
When the pinch roller 2 is arranged at an angle α with respect to the alignment roller 1, the paper 3 is skewed in the direction of the arrow 6. FIG. 5 shows the case where the pinch roller 2 is rotated and placed in the opposite direction from that shown in FIG. 4, and the paper 3 is skewed in the opposite direction to that shown in FIG.

Although the alignment roller 1 shown in FIGS. 3 to 5 is shown as being completely parallel to the photoreceptor, it is not necessary to arrange it in this way when the alignment roller 1 is installed in a copying machine or as a subunit. is difficult. Therefore, in order for the paper 3 to be advanced to the photoconductor without being skewed, the fact shown in FIG. It is attached so that it can be rotated at an angle with respect to the shaft 4, and the rotation angle of the shaft 5 is adjusted during assembly to eliminate skewing of the paper 3.

Problems to be Solved by the Invention The techniques described above teach the principle of skew correction, but do not show anything about its specific configuration. That is, it is undesirable that the configuration for rotating the axis of the pinch roller becomes complicated, and it is also undesirable that the adjustment of the rotation angle becomes troublesome.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a paper aligning device with a simple structure that allows the rotation angle of the pinch roller shaft to be easily and finely adjusted in order to eliminate skew of the paper.

Means for Solving the Problems In order to achieve the object, according to the present invention,
Consisting of an alignment roller and a pinch roller, the paper is pinched as it is being fed, and the pinch roller presses against the alignment roller to pinch the paper so that the paper is aligned and fed to the moving member on the downstream side. A sheet aligning device in which the axis of the roller can be arranged at an angle to the axis of the alignment roller, the arm supporting the end of the axis of the pinch roller at one end so that the roller can rotate. the other end of the arm is supported by an eccentric cam rotatably supported by a fixed shaft, rotation of which causes the axis of the pinch roller to align with the axis of the alignment roller. A paper alignment device is provided which is characterized in that it can be set at a predetermined angle with respect to the paper alignment device.

Examples Examples of the present invention will be described below in Figures 6 to 9.
This will be explained with reference to the figures. In addition, Figures 1 to 5
The same reference numerals are used for the members explained in the figures, and the explanation thereof will be omitted.

In FIG. 6, both ends of the rotating shaft 5 of the pinch roller 2 are angularly positionable, that is, rotatably supported by arms 7 (only one arm is shown). This arm is attached to the main body of the copying machine or as a subunit so as to move the end of the shaft 5 of the pinch roller 2 horizontally while pressing the pinch roller 2 against the alignment roller 1.

An eccentric cam 8 is rotatably attached to the end of the arm 7 opposite to the pinch roller 2, and the eccentric cam 8 is rotatably attached to the main body of the copying machine via a fixed shaft 9. ing. The eccentric cam 8 also has a lever 10 that serves as a handle for rotating the eccentric cam surface within the arm 7, as shown in FIG. Therefore, as shown in FIG. 8, when the cam 8 is rotated by holding the lever 10, the arm 7 moves in the direction of the arrow 11, and the end of the shaft 5 of the pinch roller 2 aligns with the alignment roller 1 in the paper moving direction. It shifts to In this case, it is preferable that an arm/cam structure be provided so that the other end of the pinch roller shaft 5 is shifted in a direction opposite to the paper moving direction. Its structure is similar to that shown in FIG.
When the arm 7 is in the position shown in Fig. 8, the arm 7 is
They can be connected so that they move in the opposite direction. By doing this, the state shown in FIG. 5 will be realized, and the paper 3 will be
It is possible to correct for skewing in the direction of .

FIG. 9 shows the case where the cam 8 is rotated in the opposite direction to that in FIG. By rotating it as shown in FIG. 4, it is possible to correct the oblique movement in the direction of the arrow in FIG. The amount of movement of the arm 7 by operating the lever 10, that is, the amount of angular change of the shaft 5 of the pinch roller 2 with respect to the alignment roller shaft 4, changes depending on the degree of eccentricity of the cam 8. The degree of eccentricity can be arbitrarily set as desired.

Effects of the Invention According to the present invention, an arm is provided that supports the end of the shaft of the pinch roller at one end so that the roller can rotate, and the other end of this arm is rotatably supported by a fixed shaft. The rotation of the eccentric cam allows the axis of the pinch roller to be at a predetermined angle with respect to the axis of the alignment roller, so that the alignment roller can be attached accurately to the photoreceptor. Even if the paper is not parallel to the paper, it can be easily corrected for skewed paper. In particular, while the configuration for correction is extremely simple, the axis of the pinch roller can be easily set at a predetermined angle with respect to the axis of the alignment roller, and the angle can be adjusted finely and accurately using a cam. Therefore, skew feeding of paper is completely eliminated.

In addition, skew adjustment is not only easy to perform during manufacturing and assembly of the device, but also
Maintenance and inspection work can also be done easily.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing the relationship between alignment rollers and pinch rollers of a conventional paper alignment device.
2 is a plan view showing the relationship of the pinch roller to the alignment roller of the apparatus of FIG. 1; FIG. 3 to 5 are plan views showing the angular position of the pinch roller relative to the alignment roller and the running of the paper in the apparatus of FIG. 1. FIG. 6 is a side view showing a structure for moving the pinch roller shaft of the paper alignment device according to the present invention. FIG. 7 is a perspective view of the eccentric cam of the device of the invention. 8 and 9 are views similar to FIG. 6, showing the case where the eccentric cam of the paper aligning device of the present invention is rotated. Explanation of symbols, 1...Aligning roller, 2...Pinch roller, 3...Paper, 4...Rotation axis of alignment roller, 5...Rotation axis of pinch roller, 7...Arm, 8...Eccentric cam, 9...Cam rotation axis, 10...
...cam lever.

Claims (1)

[Claims] 1 Consisting of an alignment roller and a pinch roller, the pinch roller is in pressure contact with the alignment roller so that the paper being fed is pinched and fed in an aligned state with respect to the moving member on the downstream side. In a paper alignment device in which the axis of the pinch roller can be arranged at an angle to the axis of the alignment roller, an arm is provided which supports an end of the axis of the pinch roller at one end so that the roller can rotate. the other end of the arm is supported by an eccentric cam rotatably supported by a fixed shaft, rotation of which causes the axis of the pinch roller to align with the axis of the alignment roller. A paper aligning device characterized in that it can be set at a predetermined angle with respect to the paper aligning device.