KR100304625B1 - Apparatus for steering photoreception belt for printer - Google Patents

Abstract

PURPOSE: A photosensitive belt steering device for a printer is provided to correct the moving of a photosensitive belt supported on the rollers rotatably installed in a main frame. CONSTITUTION: A photosensitive belt steering device for a printer comprises a pair of auxiliary frames(50), a shaft, first and second eccentric shafts(63) rotatably supporting the shaft and a pair of eccentric shafts, a steering roller(67) rotatably installed on the outer face of the shaft, an elastic bias unit interposed between a main frame(100) and the auxiliary frames and presses both ends of the shaft in the direction in which the tension of a photosensitive belt(10) increases, and a drive unit(80) installed between the auxiliary frames and the shaft and controlling the eccentric direction of the pair of eccentric shafts.

Description

Photosensitive belt steering device for printers {Apparatus for steering photoreception belt for printer}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive belt steering device capable of preventing lateral slippage of a photosensitive belt employed in a printing press. It relates to a photosensitive belt steering device for a printing press.

In general, a printer such as a laser printer is a device for forming a latent electrostatic image by scanning a laser beam on a photosensitive medium, developing with a toner of a predetermined color using a developing unit, and then transferring it to a printing paper for printing.

Referring to FIG. 1, a typical printing machine includes a photosensitive belt 10 that is wound around a driving roller 12, a transfer backup roller 14, and a steering roller 21 installed in a printer main body to rotate a predetermined track.

And around the photosensitive belt 10, an erasing lamp 15 for erasing the surface potential formed on the photosensitive belt 10, a charger 17 for charging the photosensitive belt 10 whose surface potential is reset to a predetermined potential, and a photosensitive member. A plurality of laser scanning units (LSUs) 18 for scanning a laser beam on the belt 10 to form an electrostatic latent image corresponding to each color, and a plurality of developing units 19 for developing a portion in which an electrostatic latent image is formed are installed. do.

In the printing machine provided as described above, the photosensitive belt 10 is wound around each of the rollers 12, 14 and 21 so that the photosensitive belt 10 is meandered in the longitudinal direction of the rollers 12, 14 and 21.

Therefore, the printer includes a meander detection sensor (not shown) for detecting the meandering of the photosensitive belt 10, and a photosensitive belt steering device 20 for correcting the meandering.

1 and 2, the conventional photosensitive belt steering apparatus 20 includes a frame 23 installed on the printing main body 1, a rotation member 25 rotatably installed on the frame 23, and The steering roller 21 is installed on the rotating member 25 to support the photosensitive belt 10 to pivot along a predetermined track, and to prevent the bending of the photosensitive belt 10 passing through the steering roller 21. A pair of stabilizing rollers 27 provided on the frame 23 and an adjusting unit 30 mounted on the printing base 1 to adjust the tilt of the steering roller 21 in the up and down directions (arrow A direction). It includes.

The rotation member 25 is coupled to the guide bar 37 elastically coupled to the frame 23 by a coupling pin 39, it is possible to rotate around the portion where the coupling pin 39 is coupled on the XY plane Is installed. The rotating member 25 is a pressure applied to the contact portion between the steering roller 21 and the photosensitive belt 10 by the elastic member 41 interposed between the guide bar 37 and the frame 23. Is rotated in a direction to compensate for the imbalance. A first cam member 43 is installed at one end of the guide bar 37 so as to adjust the elastic force applied to the elastic member 41, and the elastic member according to the rotational position of the first cam member 43. A sliding plate 45 is slidably installed on the outer circumference of the guide bar 37 to press the 41.

The steering roller 21 is coupled to the installation groove 25a of the rotating shaft 21a formed in the rotation member 25. An elastic piece 26 for pressing the rotating shaft 21a of the steering roller 21 is installed in the installation groove 25a.

The adjusting unit 30 has a driving motor 31 fixed to the printing main body 1 and a second cam member having a center thereof coupled to the rotation shaft 31a of the driving motor 31 and having a cam groove 33a. 33 and a rotation guide protrusion 35 coupled to the rotation member 25 and fitted to the cam groove 33a. Therefore, the position of the cam groove 33a is changed by the rotation of the drive motor 31, so that the height of the rotation guide protrusion 35 is variable. Accordingly, the steering roller 21 is rotated in the direction of the arrow A around the guide bar 37.

Therefore, when the meandering degree of the photosensitive belt 10 is detected by the meandering detection sensor, the steering roller 21 is tilted according to the position of the second cam member 33. Accordingly, the photosensitive belt 10 is moved in one width direction to correct meandering.

Each of the pair of stable rollers 27 is installed in the frame 23 in the direction parallel to the steering roller 21, the portion facing the steering roller 21 of the photosensitive belt 10, and the steering roller ( 21 is contacted with the part passing through to suppress the folding of the photosensitive belt (10).

As described above, the conventional photosensitive belt steering device 20 is configured by transferring the guide bar 37 provided in the center of the inside of the printer main body 1 by the first cam member 43 in the longitudinal direction thereof, thereby providing a photosensitive belt. Tension may be applied to (10) or the tension may be released. Therefore, since the inner space of the printer main body 1 for installing the guide bar 37 and the first cam member 43 is required, there is a limit in miniaturizing the overall size. In addition, there is a disadvantage that the configuration for applying / release tension is complicated.

The present invention has been made in view of the above-described point, and an object of the present invention is to provide an improved photosensitive belt steering device for a printing press to guide the tilt of the steering roller while being installed at both ends of the steering roller.

1 is a schematic view showing a printing press employing a conventional photosensitive belt steering device.

Figure 2 is a schematic exploded perspective view showing a conventional photosensitive belt steering device.

Figure 3 is an exploded perspective view showing a photosensitive belt steering device for a printer according to an embodiment of the present invention.

Figure 4 is a schematic plan view of a photosensitive belt steering device for a printing press according to an embodiment of the present invention.

5 to 7 are schematic cross-sectional views for explaining the operation of the photosensitive belt steering device shown in FIG.

8 is a schematic plan view of a photosensitive belt steering apparatus for a printing press according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10 ... Photosensitive belt 50 ... Secondary frame

61.Shaft 63 ... No.1 Bearing

65 ... 2nd Bearing 67 ... Steering Roller

71.Tensile spring 80 ... Drive

81.Power source 83 ... Power transmission belt

100 ... mainframe

In order to achieve the above object, the present invention is a photosensitive belt steering device for a printer that is capable of correcting the meandering of the photosensitive belt that is supported by the rollers rotatably installed on the main frame, the sliding to the main frame A pair of auxiliary frames installed; A shaft; A pair of first and second eccentric shafts extending from both ends of the shaft such that both ends are rotatably supported at the ends of the pair of auxiliary frames, the center of which is eccentric with respect to the center of the shaft; and; A steering roller rotatably installed at an outer circumference of the shaft, the inclination of which is adjusted according to the rotational position of the first and / or second eccentric shafts, the steering roller being rotated in contact with the photosensitive belt; Elastic bias means interposed between the main frame and the auxiliary frame to press both ends of the shaft in a direction in which the tension of the photosensitive belt is increased; And a driving means installed between the auxiliary frame and the shaft to adjust the eccentric direction of the first and / or second eccentric shaft by rotating the shaft.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a schematic exploded perspective view showing a photosensitive belt steering device for a printing press according to an embodiment of the present invention.

As shown, the present invention is formed by extending the pair of auxiliary frame 50, the shaft 61, both ends of the shaft 61 to rotate the shaft 61 relative to the auxiliary frame 50 At least one of the first and second eccentric shafts 63 and 65 whose center is eccentric with respect to the center of the shaft 61, and a steering roller rotatably installed at an outer circumference of the shaft 61. 67 and an elastic bias interposed between the main frame 100 and the auxiliary frame 50 to press both ends of the shaft 61 in the direction in which the tension of the photosensitive belt 10 increases (+ X direction). And a driving means (80) installed between the auxiliary frame (50) and the shaft (61) to adjust the eccentric direction of the first and / or second eccentric shafts (63) (65). do.

FIG. 4 is a schematic cross-sectional view of FIG. 3, in which a center of each of the first and second eccentric shafts 63 and 65 is eccentrically installed with respect to the center of rotation of the shaft 61.

3 and 4, the pair of auxiliary frames 50 are slidably installed in the main frame 100 in a direction (X-axis direction) in which the tension of the photosensitive belt 10 increases and decreases. One end of each of the auxiliary frames 50 is provided with an installation groove in which the first or second eccentric shafts 63 and 65 are installed, and the first and second eccentric shafts 63 are installed in the installation grooves. The bearings 62a and 62b, which rotatably support each of the auxiliary frames 50, are coupled thereto. The shaft 61 is supported by the first and second eccentric shafts 63 and 65 so as to be rotatable with respect to the auxiliary frame 50, and the first and second eccentric shafts 63 and 65. The inclination on the YZ plane varies depending on the eccentric position of Here, the eccentric directions of each of the first and second eccentric shafts 63 and 65 are eccentric in opposite directions with respect to the rotation center axis of the shaft 61 in different directions. The steering roller 67 is a hollow cylindrical roller. The steering roller 67 is supported by bearings 64a and 64b so as to be rotatable on the outer circumference of the shaft 61 so that at least part of its outer circumference can be driven while being in contact with the photosensitive belt 10. It is installed.

As described above, by supporting the shaft 61 using the eccentric first and second eccentric shafts 63 and 65, the central axis of the shaft 61 has a predetermined inclination angle on the YZ plane. . The inclination direction of the inclination angle is controlled by the rotation of the shaft 61 by the driving means 80 and the elastic bias means. Here, it is determined whether the photosensitive belt 10 has meandering correction according to the degree of inclination of the steering roller 67 in the Z direction.

The driving means 80 is installed between the auxiliary frame 50 and the shaft 61 to adjust the inclination direction and the inclination angle of the steering roller 67 to correct the meandering of the photosensitive belt 10. The rotation angle of 61 is controlled. To this end, the driving means 80 includes a driving source 81 for providing a rotational force, and a power transmission unit for transmitting the rotational force provided from the driving source 81 to the shaft 61. The driving source 81 is installed in the auxiliary frame 50 and has a rotation shaft 81a that is rotationally driven. The power transmission belt is coupled to the pulley grooves 81b and 63a formed at each of the rotation shaft 81a and the shaft 61, respectively, and transmits a rotational force of the drive source 81 to the shaft 61. 83). In addition, the power transmission unit may be composed of a plurality of power transmission gears for transmitting power in engagement with each other in addition to the power transmission belt (83).

The elastic bias means elastically biases the auxiliary frame 50 in the + X direction with respect to the main frame 100, thereby providing a change in the X-axis direction between the steering roller 67 and the photosensitive belt 10. prevent. To this end, the elastic bias means includes a first protrusion 101 protruding from the front end of the main frame 100, a second protrusion 51 protruding from the rear end of each of the auxiliary frames 50, and the first protrusion. It comprises a tension spring 71 interposed between the 101 and the second projection (51). The first protrusion 101 penetrates the guide long hole 50a formed in the auxiliary frame 50, and an end thereof is disposed to face the second protrusion 51.

Here, the auxiliary frame 50 between the main frame 100 and the auxiliary frame 50 to maintain a predetermined distance between the photosensitive belt 10 and the steering roller 67 when the photosensitive belt 10 is replaced. It may be further provided with a separate locking means (not shown) for locking the auxiliary frame 50 so that the tension is not applied to).

Hereinafter, the operation of the photosensitive belt steering apparatus according to an embodiment of the present invention in which the first and second eccentric shafts 63 and 65 are eccentrically disposed with respect to both ends of the shaft, as shown in FIGS. It demonstrates with reference to FIG. 5 to 7 are views of the photosensitive belt steering device in the X direction.

FIG. 5 shows the positions of the first and second eccentric shafts 63 and 65 arranged to steer the photosensitive belt 10 in the -B direction when the photosensitive belt is driven in the + B direction.

In this case, by rotating the first eccentric shaft 63 by a predetermined angle by the driving means 80, the center of the first eccentric shaft 63 is located above the center of the shaft 61 The center of the second bearing 65 is located below the center of the shaft 61. Accordingly, the steering roller 67 is inclined so as to gradually rise from right to left. Therefore, since the photosensitive belt 10 wound around the outer circumferential surface of the steering roller 67 is shifted in the -B direction, the meandering in the + B direction can be corrected.

Figure 6 shows the position of the steering roller in the case where the photosensitive belt is running without bias to either side.

Since substantial operation is unnecessary, the steering roller 67 has a portion of the upper and lower directions (Z direction) which are in contact with the photosensitive belt 10 in parallel with the traveling direction of the photosensitive belt 10. ) Does not flow left and right. Here, in the case where the moxibustion occurs at the tip between the photosensitive belt 10 and the steering roller 67, the tension applied to each of the pair of tension springs 71 is variable so that each of the pair of auxiliary frames 50 By independently sliding in the ± X direction, the steering roller 67 and the photosensitive belt 10 are horizontal to suppress the slack between the photosensitive belt 10 and the steering roller 67.

7 shows the position of the steering roller arranged to steer the photosensitive belt 10 in the + B direction when the photosensitive belt 10 is driven in the -B direction.

In this case, by rotating the first eccentric shaft 63 by a predetermined angle by the driving means 80, the center of the first eccentric shaft 63 is located below the center of the shaft 61 The center of the second eccentric shaft 65 is located above the center of the shaft 61. Accordingly, the steering roller 67 is disposed to be inclined to gradually rise from left to right. Therefore, since the photosensitive belt 10 wound around the outer circumferential surface of the steering roller 67 is shifted in the + B direction, the meandering in the -B direction can be corrected.

Further, in the above-described first and second eccentric shafts 63 and 65 of the photosensitive belt steering apparatus according to the present invention, only the second eccentric shaft 65 is centered on the shaft. The case where eccentrically installed with respect to the rotation center of (61) is shown. Also in this case, as shown in Figures 5 to 7, by adjusting the rotation angle of the second eccentric shaft 65 by the drive means 80, the degree of inclination and inclination of the steering roller 67 By changing the direction, the meandering of the photosensitive belt 10 can be corrected.

In addition, although not shown, only the first eccentric shaft 63 may be installed so that its center is eccentric with respect to the rotation center of the shaft 61.

As described above, the photosensitive belt steering apparatus for a printing press according to the present invention is installed on both sides of the auxiliary frame, thereby realizing a structure capable of pressing both ends of the steering roller, and steering the inclination center of the steering roller. There is an advantage that it can be located in the center of the roller. In addition, it is possible to achieve miniaturization and compactness of the overall size by drastically reducing the number of parts without using the internal space of the printer main body.

Claims (2)

In the photosensitive belt steering device for a printing machine that is capable of correcting the meandering of the photosensitive belt that is supported by the rollers rotatably installed in the main frame A pair of auxiliary frames slidably mounted to the main frame; A shaft; A pair of first and second eccentric shafts extending from both ends of the shaft, the both ends being rotatably supported at the ends of the pair of auxiliary frames, the center of which is eccentric with respect to the center of the shaft; and; A steering roller rotatably installed at an outer circumference of the shaft, the inclination of which is adjusted according to the rotational position of the first and / or second eccentric shafts, the steering roller being rotated in contact with the photosensitive belt; Elastic bias means interposed between the main frame and the auxiliary frame to press both ends of the shaft in a direction in which the tension of the photosensitive belt is increased; And a driving means installed between the auxiliary frame and the shaft to adjust the eccentric direction of the first and / or second eccentric shaft by rotating the shaft. The method of claim 1, wherein the driving means, A drive source installed on the auxiliary frame and having a rotation shaft driven to rotate; And a power transmission unit formed across the rotating shaft and the shaft to transfer the rotational force provided from the driving source to the shaft.