JPH04123650U - Position adjustment mechanism using eccentric pins - Google Patents

Abstract

(57) [Summary] [Purpose] Position adjustment using eccentric pins that is easy to adjust, automatically holds the position after adjustment, and does not displace during subsequent fastening work, etc., and has a simple structure. provide a mechanism; [Structure] The small diameter portion 1a of the eccentric pin 1 is inserted into the main body base 2 of the image reading device, and the large diameter portion 16 of the eccentric pin 1 is inserted into the lens holder 3 placed on the main body base 2. A position adjustment member 2 that is inserted to relatively displace the positions of the main body base 2 and lens holder 3 by rotation of the eccentric pin 1, and the large diameter portion 1b of the eccentric pin 1 is rotatably inserted. The main body has a recess 4a and is fixed to the lens holder 3, and a spring 5 is fixed to the main body and elastically presses the eccentric pin 1 inserted into the recess 4a. Features.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses eccentric pins to adjust the position of the member to be adjusted relative to the base member. This relates to a position adjustment mechanism.

0002

[Prior art]

Conventionally, image reading devices use an image sensor to form a light image on an image sensor. It is necessary to adjust the position of the image sensor. An eccentric pin is used as this position adjustment mechanism. There is a position adjustment mechanism used. Figure 2 is a schematic diagram of a conventional position adjustment mechanism using eccentric pins. FIG. 3 is a perspective view showing the configuration. In FIG. 2, 21 is an eccentric pin, and the eccentric pin 2 1 has a structure in which the axes of the small diameter shaft 21a and the large diameter shaft 21b are eccentric. Eccentric pi The small diameter shaft 21a of the pin 21 is inserted into a hole 23a provided in a base member (not shown), The large diameter shaft 21b is fitted into a through hole 22a provided in the member 22 to be adjusted.

0003 In the position adjustment mechanism using the eccentric pin configured as described above, the eccentric pin 21 is rotated. By doing so, the member to be adjusted moves in the direction of arrow A with respect to the base member, and the position is adjusted. I can arrange things. In addition, as a conventional position adjustment mechanism using this type of eccentric pin, for example, For example, there is an image sensor adjustment device disclosed in Japanese Unexamined Utility Model Publication No. 62-24557. This position adjustment mechanism using eccentric pins has a simple structure, can be mass-produced, and is inexpensive. It is widely used because it is cheap.

0004

[Problem that this invention attempts to solve]

Although it is easy to adjust the position using the eccentric pin in the conventional configuration described above, the eccentric pin has a large Since the axes of the diameter shaft and small diameter shaft are eccentric, rotational torque is easily generated with a small amount of force, making adjustment difficult. Occurrence of load during the work of tightening the adjustment member in its position after adjustment is completed, or other The eccentric pin may rotate due to a slight external force such as when making adjustments, and the adjusted position may be This has the disadvantage that stable and reliable adjustment work cannot be performed because of displacement. Also, this In order to eliminate these drawbacks, a large and complicated mechanism was required.

[0005] The present invention was developed in view of the above points, and has a simple structure, easy position adjustment, and easy adjustment. It is an object of the present invention to provide a position adjustment mechanism using an eccentric pin that is free from the risk of position displacement after alignment. purpose.

[0006]

[Means to solve the problem]

In order to solve the above problems, the present invention has developed an eccentric Insert the small diameter shaft of the center pin into the hole provided in the base member, and adjust the large diameter shaft. The part to be adjusted is adjusted by inserting it into a hole provided in the elephant member and rotating the eccentric pin. In a position adjustment mechanism using an eccentric pin to adjust the position of the material relative to the base member. , a holder member is attached to the member to be adjusted, and the eccentric pin is attached to the holder member. A through hole is provided through which the large diameter shaft passes, and the large diameter shaft of the eccentric pin is provided on the inner surface of the through hole. It is characterized by providing an elastic member that presses the side surface.

[0007]

[Effect]

By configuring the position adjustment mechanism using the eccentric pin as described above, the elastic member can be The elastic force presses the large diameter shaft side of the eccentric pin into contact with the inner surface of the through hole, so this eccentricity Since the pin does not easily rotate due to external force, remove the adjustment member after adjustment is complete. Due to the occurrence of load during the work of tightening in the position of There is no possibility that the eccentric pin will rotate due to external force and the position adjustment will be messed up.

[0008]

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. Figure 1 shows the eccentric pin of this invention. FIG. 3 is an exploded perspective view showing a position adjustment mechanism using a In Figure 1, 1 is an eccentric pin. The eccentric pin 1 has a structure in which the axes of the small diameter shaft 1a and the large diameter shaft 1b are eccentric by a dimension E. This is exactly the same as the conventional version. In addition, the base member 2 and the adjustment pair It is also the same as the conventional example described above in that it includes the elephant member 3. The base member 2 has an eccentric pin 1. An elongated reference hole 2a into which the small diameter shaft 1a is inserted is provided, and the member 3 to be adjusted has an eccentric A hole 3a into which the large diameter shaft 1b of the pin 1 is inserted is provided.

[0009] 4 is a holder member attached to the member to be adjusted as described later. the holder - The member 4 is provided with a large hole 4a through which the large diameter shaft 1b of the eccentric pin 1 passes. A groove 4b is provided across the upper part of the large hole 4a. 5 is a plate formed in a U-shape One side of the leaf spring 5 is fixed to the side of the holder 4 by the screw 6, and the other side is fixed to the side of the holder 4 by the spring 5. It is located within the groove 4b. Further, the adjustment member 3 is attached to the diagonal portion of the holder 4. A pair of pins 7 are provided to be inserted into the provided holes 3b.

0010 To assemble the position adjustment mechanism made up of the above-mentioned components, first, The pair of pins 7 are inserted into the holes 3b of the member 3 to be adjusted, and the holder member 4 is the target to be adjusted. Incorporate into member 3. Next, insert the eccentric pin 1 so that its small diameter shaft 1a is at the base of the base member 2. The large diameter shaft 1b is fitted into the large hole 4a of the holder member 4 into the semi-hole 2a. Incorporate. The large diameter shaft of the eccentric pin 1 is pressed by the leaf spring 5, and its side surface is inside the large hole 4a. Pressed strongly against the surface. As a result, the eccentric pin 1 is sandwiched between the leaf spring 5 and the inner surface of the large hole 4a. It will not rotate easily. In addition, if the eccentric pin 1 is assembled into the holder member 4, Alternatively, the assembly of the eccentric pin 1 and the holder member 4 may be attached to the member to be adjusted 3. Of course it is.

[0011] In the position adjustment mechanism configured as described above, when the eccentric pin 1 is rotated, the member to be adjusted 3 moves in the direction of arrow X. In this case, the reference hole 2a has a length perpendicular to the direction of the arrow X. Since it is a hole, will this movement of the small diameter shaft 1a be absorbed by the reference hole 2a? Then, the member 3 to be adjusted moves linearly in the direction of the arrow X.

0012 As described above, rotate the eccentric pin 1 to move the adjustment target member 3 to the base member by the desired amount. 2, then directly or indirectly move the base member 2 and the adjustment target member 3. It is fixed by tightening with screws (not shown), etc., and the adjustment is done by this tightening force etc. Even if an external force is applied to the member 3 to be aligned, the large diameter shaft 1b of the eccentric pin 1 will not act as a leaf spring as described above. 5 and the inner surface of the large hole 4a, this allows the eccentric pin 1 to rotate. movement, and the position adjustment will not go awry. In addition, after tightening and fixing the adjustment target member 3, The assembly of the eccentric pin 1 and the holder member 4 can also be removed from the member to be adjusted 3. Ru.

[0013] In the above embodiment, the leaf spring 5 is used to press the large diameter shaft 1b of the eccentric pin 1. However, it is not limited to leaf springs, and can also be used for other shapes of springs and elastic members such as rubber. You may also use Further, in the above embodiment, the holder member 4 and the adjustment target member 3 are Although they are configured as separate bodies, the holder member 4 and the adjustment target member 3 may be formed integrally.

[0014] The above position adjustment mechanism can be used to adjust the position of various equipment members. For example, an image In the reading device, the base member 2 is the main body base, and the adjustment target member 3 is the lens holder. When used as a ruler, it exhibits excellent effects as a position adjustment mechanism in the optical axis direction of the lens. do.

[0015]

[Effect of the idea]

As explained above, according to the present invention, the position can be adjusted by rotating the eccentric pin. After adjusting the position, the eccentric pin does not rotate due to external force, making it easy to adjust the position. Moreover, holding after adjustment is automatically performed. Therefore, for example, after adjusting the position, Stable adjustment work is possible without shifting the adjustment position even if the materials are tightened with screws etc. You can get excellent results by being able to do it.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a position adjustment mechanism using an eccentric pin according to the present invention.

[Fig. 2] A perspective view showing a schematic configuration of a conventional position adjustment mechanism using an eccentric pin.

[Explanation of symbols]

1 Eccentric pin 2 Base member 3 Parts to be adjusted 4 Holder member 5 Leaf spring 6 screws 7 pins

Claims (2)

[Scope of utility model registration request] Claim 1: The small diameter shaft of an eccentric pin formed by eccentrically setting the axes of the small diameter shaft and the large diameter shaft is inserted into a hole provided in a base member, and the large diameter shaft is provided in a member to be adjusted. Insert the hole into the
In a position adjustment mechanism using an eccentric pin that adjusts the position of the member to be adjusted with respect to a base member by rotating the eccentric pin, a holder member is attached to the member to be adjusted, and the size of the eccentric pin is attached to the holder member. 1. A position adjustment mechanism using an eccentric pin, characterized in that a through hole is provided through which the diameter shaft passes, and an elastic member is provided on the inner surface of the through hole to press a side surface of the large diameter shaft of the eccentric pin. 2. The position adjustment mechanism using an eccentric pin according to claim 1, wherein the holder member is integrally provided with the member to be adjusted.