JP2533423Y2 - Reciprocating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a reciprocating device such as an image input device in which a reading unit moves along a guide and reads an image of a document.

[Conventional technology]

2. Description of the Related Art Conventionally, an image input apparatus couples a reading unit provided with an image sensor to a toothed belt (timing belt) driven by a motor or the like, and drives the reading unit along a guide by driving the toothed belt. While reading the image of the manuscript.

As described above, in the image input apparatus, the toothed belt and the reading unit are connected by pressing the toothed belt 53 with a stopper plate 52 such as a sheet metal on a housing 51 accommodating the reading unit as shown in FIG. , Screws 54 or the like, or as shown in FIG. 8, a toothed belt 56 is press-fitted into a toothed groove 58 of a connecting portion 57 integrated with a housing 55 of a reading portion and fixed to the housing 55. ing.

[Problems to be solved by the invention]

 However, these have the following problems.

In FIG. 7, in order to connect the toothed belt 53 to the housing 51, a stop plate 52 and two screws 54 are required, so that the number of parts is large and the number of mounting steps is also large. In addition, since the tooth profile of the belt 53 is crushed by the stopper plate 52 and deformed, if the toothed belt 53 is removed for repair, maintenance or the like, if the same portion is not fixed by the stopper plate 52 during assembly, the deformed tooth profile portion may be driven by the drive pulley. It does not engage with and causes incorrect reciprocal movement. Further, the toothed belt 53 is stretched by the tightening pressure of the stopper plate 52, and the feeding accuracy of the reciprocating movement is deteriorated.

In FIG. 8, a slide core for removing the mold of the tooth-shaped groove 58 is required in the mold at the time of manufacturing the housing 55,
Mold production costs are high. In addition, since the slide core of the tooth groove 58 is small and thin, it is easily deformed and worn,
Poor accuracy of the tooth profile or shortening of the service life of the mold.

[Purpose of the invention]

An object of the present invention is to provide a reciprocating device in which the operation of connecting a moving unit such as a reading unit and a drive transmission member such as a toothed belt is easy and the manufacturing of the connecting unit is easy.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a reciprocating device that reciprocates a moving unit along a guide by reciprocating a driving transmitting member coupled to a moving unit. Are formed integrally with the moving part, have first and second support parts that contact and support the drive transmission member, and are also formed integrally with the moving part, and the first and second parts are integrally formed with the moving part. And a third support for supporting the drive transmission member by sandwiching the drive transmission member between the first and second support portions and providing the first and second support members. An opening wider than a portion of the third support portion that is in contact with the drive transmission member is formed in the moving portion at a position opposite to the third support portion in the middle of the support portion. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

<Structure> In this embodiment, the present invention is applied to an image input device.

As shown in FIGS. 1 and 2, the image input device 1 includes a lower cover 2, a reading window 3 attached to the lower cover 2 made of a transparent member such as glass or an acrylic plate, an upper cover 4, It includes a viewing window 5 provided in the upper cover 4 and a moving unit, for example, a reading unit 9 that moves in the covers 2 and 4 by a toothed belt 13 (drive transmission member).

An index portion 16 is formed inside the reading window 3 by silk printing or the like. The index portion 16 includes a portion 16A indicating a reading start position in the sub-scanning direction, a portion 16B indicating a reading range in the main scanning direction, and a portion 1A indicating a reading end position.
6C is formed in a U-shape. Note that the index portion 16C at the reading end position does not enter the reading range but protrudes out of the reading range.

In the reading window 3, a white reference surface 25 for performing shading correction is formed by silk printing or pasting a white seal.

As shown in the perspective view of FIG. 1, the reading section 9 has a columnar shape whose outer shape is slightly larger than the width of the viewing window 5 in the main scanning direction, and as shown in FIG. End face
9a is a plane parallel to the main scanning direction.

The light source 7 is provided in the housing 45 of the reading unit 9.
, Mirrors 31, 32, 33, and 34, a lens 35, and an image sensor 8 such as a photoelectric conversion element such as a CCD. The mirrors 32 and 33 are connected to the lens 35 and the image sensor 8.
By arranging it below, the position of the lens 35 and the image sensor 8 can be adjusted from above the reading unit 9. Therefore, as shown in FIG.
A cover 37 is attached to the upper surface of the device such that it can be opened and closed.

A protruding piece 23 having an elongated hole 22 extending in the sub-scanning direction is screwed to the upper surface of the housing 45, as shown in FIG. Is provided with a sensor 24 for detecting that has moved to the reading standby position.

Further, as shown in FIG. 3, the reading section 9 slidably inserts a guide, for example, a rod 17 extending in the sub-scanning direction into a support member 18 formed on one side end, and the other side end. The supporting member 19 formed in the above is mounted on a guide extending in the sub-scanning direction, for example, a guide rail 20 via a sliding sheet member (not shown). As shown in FIG. 4, the housing 45 connects the connecting portion 42 to the driving pulley 37 driven by the step motor 36 and the driven pulley 38
Is connected to a part of the toothed belt 13 stretched with a predetermined tension.

The connecting portion 42 has an R-shaped tooth portion 39 which meshes with the teeth of the toothed belt 13 formed integrally with the housing 45 as shown in FIG.
(Third support portion), a convex portion 40 as a first support portion and a convex portion 41 as a second support portion formed on both sides of the tooth profile portion 39, and a tooth profile at an opposing portion of the tooth profile portion 39. Section 39 toothed belt
An opening 43 formed wider than the portion in contact with 13 is provided, and the toothed belt 13 having a thickness T is inserted between the tooth profile 39 and the projections 40 and 41 in a curved manner.

Note that the thickness T of the toothed belt 13, the distance t between the end of the tooth profile 39 and the protruding surfaces of the projections 40 and 41, the end surface of the tooth profile 39 and the projection 4
The distance S between the end surface of the tooth 41 and the tooth bottom of the tooth profile 39 and the housing
The relationship between the shortest distance H and the shortest distance H is, for example, t <T, H> T, S> T
It has become.

By the way, the housing 45 is formed of a synthetic resin, disassembled into a plurality of blocks, and molded by a mold.

<Operation> In the image input device, assembling of the reading unit 9 as a moving unit is performed by a driving pulley 37 and a driven pulley as shown in FIG.
And a toothed belt 13 as a drive transmission member, and a part of the belt 13 is provided with convex portions 40 and 41 as first and second support portions as shown in FIGS. And a toothed portion 39 serving as a third supporting portion facing these.
As shown in FIG. 5 (A), since the tooth profile 39 is formed in an R-shape, the connection between the teeth of the toothed belt 13 and the teeth of the tooth profile 39 together with the projections 40 and 41 is more reliable. Made, there is no variation in tooth contact.

In the image input apparatus 1 assembled in this manner, the reading position P of the reading unit 9 is at a reading standby position P1 which is retracted by a predetermined distance from the reading end position P4 before starting reading, as shown in FIG. That is, the reading unit 9 stands by at a position where the end surface 9a coincides with the reading end position P4.

In this state, when an image on the document 6 is to be read, the image to be read falls within a range from the reading start position P3 indicated by the index portion 16A to the reading end position P4 indicated by the end surface 9a of the reading section 9. The apparatus main body 1 is placed on the document 6 while viewing it through the viewing window 5 so as to enter.

Then, by turning on a reading start switch (not shown), the step motor 36 is driven, the driving pulley 37 is rotated, and the toothed belt 13 is moved. Therefore, the reading section 9 is moved along the rod 17 and the guide rail 20 to the white reference reading position P2.

That is, in this type of image input apparatus 1, even at the same original density, each pixel in the main scanning direction can obtain the same level of photoelectric conversion output due to variations in brightness of the light source 7 in the main scanning direction. Often disappears. Therefore, a variation in the photoelectric conversion output in the main scanning direction, that is, a white reference image having a white density is read in order to correct shading, and a variation in the photoelectric conversion output in the main scanning direction is detected in advance. The process of correcting the photoelectric conversion output actually read based on the data of the variation is performed. However, in the image input apparatus 1 of this embodiment, the white reference image is not provided outside but is provided inside the reading window 3. ing. Therefore, when starting to read, first
To read 25, move the reading unit 9 to the white reference reading position P2.
The white reference plane 25 is read at this position P2, and the photoelectric conversion output is sent to the outside.

Next, the reading unit 9 is moved to the reading start position P3 by rotating the stepping motor 36 in the reverse direction.
It is moved at a predetermined speed from P3 toward the reading end position P4. That is, reading of the document image in the sub-scanning direction is started. At this time, while the reading unit 9 advances one line in the sub-scanning direction, the reading unit 9 forms the reflected light reflected from the surface of the document 6 on the image sensor 8 by one pixel in the main scanning direction, and photoelectrically converts the light image. The output is sent to the outside as an image signal.

When the number of pulses reaches a predetermined number of times after the stepping motor 36 reversely rotates, the reading position P of the light source 7 of the reading unit 9 is read.
Reaches the reading end position P4, and the reading ends. Further, when the reading section 9 moves and the end of the protruding piece 23 provided on the reading section 9 comes into contact with the sensor 24, the sensor 24 is turned on, and the ON signal indicates that the reading section 9 has reached the standby position 1. This is input to a control unit (not shown) as a signal to be shown.
Therefore, this control unit stops the step motor 36.
As a result, the end face 9a of the reading section 9 is moved to the reading end position P4.
And stands by for the next document reading operation in this state.

Therefore, according to this embodiment, the following effects can be obtained.

(1) As shown in FIG. 5, the connecting portion 42 of the housing 45 has an R-shaped tooth portion 39 that meshes with the toothed belt 13 and the convex portions 4 on both sides.
0, 41, the toothed belt 13 is inserted between the tooth profile 39 and the convex portions 40, 41, and the toothed belt 13 is connected to the housing 45. In addition, the coupling can be easily performed without using coupling means, the parts cost can be reduced, and the number of steps for mounting the toothed belt 13 can be reduced.

(2) The tension of the toothed belt 13 and the projections 4 on both sides of the tooth profile 39
By using 0, 41, the toothed belt 13 was fixed to the housing 45 by applying a force for pressing the toothed belt 13 to the tooth profile 39, so that the elongation of the belt 13 and deformation of the belt tooth profile were eliminated,
The feeding accuracy of the reading unit 9 can be improved.

(3) Since the tooth profile 39 has an R-shape, the bending of the toothed belt 13 is absorbed, a greater pressing force is applied to a larger number of teeth, and the tooth is securely fixed, thereby improving the feeding accuracy of the reading unit 9. it can.

(4) Since the opening 43 larger than the facing surface of the tooth profile 39 is formed on the tooth surface side of the tooth profile 39, the mold on the tooth surface of the tooth profile 39 can be pulled out through the opening 43, and the slide core of the mold is formed. Is not required, and poor tooth profile accuracy can be prevented. In addition, mold production costs are reduced, and the mold life is prolonged.

(Modification)

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and for example, the following modifications are possible.

(1) By making the shape of the opening 43 large so that the toothed belt 13 can be inserted as shown in FIG. 6, the convex portions 40 and 41 on both sides of the R-shaped tooth profile portion 39 may be omitted. In this case, both ends of the opening 43 become the first and second support portions 46 and 47.

(2) The drive transmission member is not limited to the toothed belt, but may be a wire or a rope.

(3) The reciprocating device is not limited to the image input device in which the reading unit 9 reciprocates and reads an image.
The R dimension, S dimension and t dimension of the R-shaped tooth profile 39 shown in the figure are
By setting the dimensions appropriately in accordance with the material shape and the like of the drive transmission member, it can be effectively applied to a copying machine, a printer, a plotter, a positioning device, a machine tool, a transfer machine, and the like.

(4) In the above-described embodiment, the joint portion is molded with a synthetic resin, but may be formed by press-molding a metal plate or the like.

[Effect of the invention]

In short, the present invention is directed to a reciprocating device for reciprocating a moving unit along a guide by reciprocating a driving transmitting member coupled to a moving unit. Has first and second support portions integrally formed on the moving portion and in contact with and supporting the drive transmission member, and is also integrally formed on the moving portion,
The first and second support portions are located between the first and second support portions.
And a third support portion for supporting the drive transmission member by sandwiching the drive transmission member between the first and second support portions.
An opening wider than a portion of the third support portion that is in contact with the drive transmission member is formed in the moving portion at a position opposite to the third support portion in the middle of the second support portion. ,
The moving part and the drive transmission member can be connected only by sandwiching the drive transmission member between the first and second support parts and the third support part,
The joining operation is easy, and when the joining portion is molded, the mold can be removed through the opening, and the production of the joining portion is easy.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention.
FIG. 2 is an external perspective view of the image input device, FIG. 2 is an enlarged explanatory view showing the relationship between the index unit and the reading unit, FIG. 3 is a configuration diagram showing a part of a mechanism for moving the reading unit in the sub-scanning direction. 4
The figure is a perspective view showing the structure around the joint, FIG. 5 (A)
(B), (C) is a figure which shows the structure of a connection part. 6 (A), 6 (B) and 6 (C) are views showing modified examples of the present invention. 7 and 8 are diagrams for explaining the prior art. 1 image input device (applicable device of reciprocating device) 9 reading unit (moving unit) 13 toothed belt (drive transmission member) 17 rod (guide) 20 guide rail (guide) 39 ... Toothed portion (third support portion) 40... Convex portion (first support portion) 41... Convex portion (second support portion) 42.

Claims (1)

(57) [Scope of request for utility model registration] 1. A reciprocating device for reciprocating a moving unit along a guide by reciprocating a driving transmitting member coupled to a moving unit, wherein the coupling unit couples the moving unit and the driving transmitting member. The department is
First and second support portions are formed integrally with the moving portion, and contact and support the drive transmission member. The first and second support portions are also formed integrally with the moving portion, and are formed between the first and second support portions. And a third support portion for supporting the drive transmission member by sandwiching the drive transmission member between the first and second support portions, and providing the first and second support portions. A reciprocating moving device, wherein an opening wider than a portion of the third supporting portion that is in contact with the drive transmitting member is formed in the moving portion at a position facing the third supporting portion in the middle of the moving portion.