JPH04113089U - Sensor positioning device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable highly accurate positioning and setting of a sensor for detecting image density, etc. with respect to a photoreceptor as a subject. [Structure] The sensor is fixed in advance to the sensor board directly or indirectly via a sensor unit integrated with the sensor, and the sensor board is inserted into the groove of the guide means that is correctly positioned with respect to the photoreceptor. Installing. In this mounted state, the sensor unit or sensor board is pressed against the groove to absorb looseness in the groove and eliminate instability in the sensor position relative to the photoreceptor. An abutting surface serving as a pressing surface at that time was provided on the sensor unit or the sensor substrate.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a copier, facsimile, and laser printer that uses electrophotography. The present invention relates to a sensor positioning device that can be applied to image forming apparatuses such as - and the like.

0002

[Conventional technology]

Images from copiers, facsimile machines, laser printers, etc. that use electrophotography Reflective type for non-contact detection of paper presence, image density, etc. in forming equipment sensors are used.

0003 The detection output of this sensor largely depends on the distance between the sensor and the object. The distance to the specimen must be set with high precision.

0004 The method of attaching the sensor to the photoconductor is to install it fixedly opposite the photoconductor. a guide means having a groove for guiding a sensor board; The main component is a sensor board equipped with a sensor, which is removably installed in the groove of the There is something that can be used as wood.

[0005] 9 and 10 illustrate an example, where 1 is a photoreceptor and 2 is a guide. Show the means. A groove portion 3A is formed in this guide means.

[0006] On the other hand, the sensor 4 is attached to a sensor board 5, and this sensor board 5 is attached to the groove. 3A, the sensor is positioned relative to the photoreceptor. like this This method is also disclosed in Japanese Unexamined Patent Publication No. 1158/1983.

[0007]

[Problem that the idea aims to solve]

In the prior art, even if the guide means 2 is not correctly installed at a predetermined position, Even if the sensor board 5 and the groove 3A are , due to the gap between the sensor 4 and the sensor board 5 during installation, The position of the sensor 4 deviates from the target position, making it impossible to obtain the desired detection performance. There is a problem with this.

[0008] The present invention is a sensor positioning system that enables the sensor to obtain the desired detection performance. The purpose of this invention is to provide a positioning device.

[0009]

[Means to solve the problem]

In order to achieve the above object, the sensor positioning device according to the present invention A sensor unit configured by integrally combining a sensor with a block, or a sensor The sensor unit or a part of the sensor board is fixed to the guide means groove. This is a contact positioning surface for the bent portion provided in the section.

0010 Now, install the sensor unit into the block that has a convex shape when viewed from the front. The upper surface of both shoulders of this sensor unit is formed into the groove. It can also be used as an abutment positioning surface for a bent portion provided in the section.

[0011] In this case, the upper surfaces of both shoulders of the sensor unit are formed on the same virtual plane. Good.

0012 In addition, it is located on the mounting direction of the sensor board to the guide means and adjacent to the guide means. In addition to providing a holding part for the sensor board, the upper surface of both shoulders of the sensor unit is It is effective to provide a spring that presses against the bent portion provided in the groove.

[0013] Then, the spring is held in a position that is not directly below the sensor or sensor unit. It is best to position it closer to the department.

[0014]

[Effect]

In order to achieve the above object, in the sensor positioning device according to the present invention, The sensor unit or sensor unit has a contact positioning surface for directly pressing the guide means. It is provided on the sensor board and can be held in close contact with the press.

[0015]

【Example】

Example 1 (see Figures 1 to 3 and 8) This example corresponds to claims 1 to 4. Regarding claim 1, the sensor unit This is an example in which this is used as a contact positioning surface for the bent part provided in the groove. .

[0016] FIG. 3 shows the sensor unit 14. This sensor unit is It has a block shape with a convex shape when viewed from the front, that is, from the direction of arrow A. Ru.

[0017] The sensor unit 14 protrudes from between the shoulders 14R and 14L. A sensor (not shown) is integrated into the top portion 14a of the rising portion 14E. Ru.

The upper surfaces 14R ₁ and 14L ₁ of the shoulder portions 14R and 14L constitute a rectangular flat surface elongated in the direction of the arrow A, for example, one virtual plane with the upper surface 14R ₁ as a part of the plane. When assuming this, the upper surface 14L ₁ is formed to be on the same plane as this virtual plane.

[0019] This sensor unit 14 is arranged in the longitudinal direction of a sensor substrate 15 which is in the form of a long flat plate. It is precisely fixed on the upper surface of the approximately central part. Therefore, the sensor unit and sensor board There is no looseness or misalignment in the installation.

[0020] This sensor board 15 on which the sensor unit 14 is attached is used when positioning the sensor. is inserted into the groove 3 of the guide means 2 and pushed in the mounting direction shown by arrow B. I can't stand it.

[0021] Eventually, the tip of the sensor board 15 reaches the back side of the guide means, and further beyond that, the tip of the sensor board 15 reaches the back of the guide means. The holder of the sensor board is equipped with a card edge connector that connects electrical signals. I can accept it. At this point, the pushing of the sensor board 15 is stopped. At this time, Sen The subunit 14 is located approximately at the center of the photoreceptor in the axial direction.

[0022] Although the story is different, the sensor board 15 is equipped with a spring 16 (in this example, a plate) in advance. spring) is provided. This spring 16 has one end attached to the bottom 3B of the guide means 2. The side edges abut and apply an elastic force.

For this reason, the sensor board 15 is lifted to the opposite side, that is, to the photoreceptor side, and the contact positioning surfaces 14R ₁ and 14L ₁ , which are the upper surfaces of both shoulders 14R and 14L, are elastically attached to the bent portion 3C of the groove portion 3A. It will be forced on you. Note that the spring 16 may be a coil spring instead of a leaf spring.

[0024] In this way, the contact positioning surfaces 14R ₁ and 14L ₁ come into contact with the bent portion 3C. This state of contact is maintained by a spring. Therefore, the backlash that has conventionally occurred no longer occurs, so that the sensor can be correctly positioned with respect to the photoreceptor 1 as expected. Here, since the upper surfaces of both shoulder portions are on the same virtual plane, the sensor unit is not attached at an angle.

[0025] Here, the distance between the sensor and the photoconductor is different from the conventional installation. Since it is determined only by the positional accuracy of the guide means and the It is possible. Furthermore, accurate image density can be recognized, resulting in good images with stable density. Ability to provide images and maintain a stable toner concentration within the developing device. become.

[0026] Example 2 (see Figures 4 and 5) This example corresponds to claim 1. In other words, groove the part of the sensor board to which the sensor is fixed. This is an example in which the contact positioning surface is used as an abutment positioning surface for a bent portion provided in the section.

[0027] In this example, the sensor unit 140 is fixed to the sensor board 150 as shown in the figure. has been done. A sensor is integrally attached to the sensor unit 140. . Note that the configuration is such that the sensor is attached directly to the sensor board instead of the sensor unit. You can also

In any case, in this example, the upper surface portions on both sides of the sensor board 150 serve as contact positioning surfaces 150R ₁ and 150L ₁ for contacting the bending portion 3C. Since this portion is configured as a surface that can be pressed against the bending portion 3C by the spring 16, looseness can be absorbed in substantially the same manner as in Example 1 above.

[0029] Example 3 (see Figures 4 to 7) This example corresponds to claim 5 and relates to the pressing position of the spring 16.

[0030] In the above example, ideally, the area directly below the sensor indicated by the symbol in FIGS. 4 and 6. It would be sufficient if a force to push up the sensor board is applied at , but in reality, the width of the board, Soldering of sensor legs (leads), pattern layout, elastic body that pushes up the board This force is applied directly below the sensor or sensor unit. It may be difficult to do so.

[0031] In such cases, the location of the spring should be slightly shifted from directly below the sensor, etc., but where should it be located? That doesn't mean it's okay.

[0032] As shown by the symbols in FIGS. 4 and 6, if the position is closer to the holding part 17 than directly below the sensor, If the sensor is set to the position of , the sensor will be supported on one side. The weight of the board itself and the sensor unit may bend and lower the board, making sure that it is not pushed firmly into the guide means. This is because it becomes impossible to achieve positional accuracy.

[0033] Therefore, as indicated by the symbols in FIGS. 4 and 6, the anti-holding part 17 is lower than directly below the sensor. If the spring position is set closer to the sensor, it will be supported on both sides of the sensor, so The sensor unit 14 can be surely pressed against the guide means, and the sensor and photosensitive The distance to the body can be positioned with high precision.

[0034]

[Effect of the idea]

According to the present invention, the sensor can be positioned with high precision with respect to the photoreceptor.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along the line E-E in FIG. 2, illustrating the main parts of a sensor positioning device according to the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 illustrating the main parts of the sensor positioning device according to the present invention.

FIG. 3 is a perspective view of a sensor unit having an abutment positioning surface.

4 is a diagram illustrating an example in which a part of the sensor board is used as a contact positioning surface and a spring position, and is a sectional view taken along the line FF in FIG. 5. FIG.

FIG. 5 is a cross-sectional view of FIG. 4;

6 is a diagram illustrating a spring position when a part of the sensor unit is used as a contact positioning surface, and is a sectional view taken along the line GG in FIG. 7. FIG.

FIG. 7 is a cross-sectional view of FIG. 6;

FIG. 8 is an explanatory diagram corresponding to FIG. 2, showing a sensor positioning means according to the present invention.

FIG. 9 is an explanation of a sensor positioning means according to the prior art.

FIG. 10 is a diagram illustrating problems in the sensor positioning means according to the prior art.

[Explanation of symbols]

2 Guide means 3A Groove portion 3C Bend portion 14 Sensor unit 14R Sensor unit shoulder portion 14L Sensor unit shoulder portion 14R ₁ Contact positioning surface 14L ₁ Contact positioning surface 15 Sensor board 16 Spring 17 Holding portion 150 Sensor board 150R ₁ contact Contact positioning surface 150L ₁ Contact positioning surface

Claims (5)

[Scope of utility model registration request] 1. A guide means fixedly provided opposite to a photoreceptor and having a groove for guiding a sensor board, and a sensor board with a sensor mounted thereon, the sensor board being detachably attached to the groove of the guide means. In a sensor positioning device having a sensor as a main component, a sensor unit or a sensor configured by integrally combining a sensor with a block is fixed to a sensor board, and a part of the sensor unit or sensor board is provided in the groove. A positioning device for a sensor, characterized in that the positioning surface is in contact with a folded portion of the sensor. 2. In claim 1, the sensor unit has a structure in which the sensor is integrally assembled with a block having a convex shape when viewed from the front, and the upper surface of both shoulders of the sensor unit is connected to the groove. A positioning device for a sensor, characterized in that the positioning surface is in contact with a bent portion provided in the sensor. 3. The sensor positioning device according to claim 2, wherein the upper surfaces of both shoulders of the sensor unit are formed on the same virtual plane. 4. According to claim 2 or 3, a holding part for the sensor board is provided in the mounting direction of the sensor board to the guide means and adjacent to the guide means, and a holding part for the sensor board is provided on both shoulders of the sensor unit. A sensor positioning device comprising a spring that presses the upper surface against a bent portion provided in the groove. 5. The sensor positioning device according to claim 1 or 4, wherein the pressing position of the spring is located closer to the holding portion than directly below the sensor or the sensor unit.