JPH1159945A - Document moving type reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a document moving type reader requiring less frequencies for removing dust deposited on a document cleaning member and capable of preventing the bending of the document with the document cleaning member. SOLUTION: In a document moving type reader 10, a document is passed from on document guide plates 4, 6 between a contact glass 2 and a document holding roller 1 to read the image of the document moved on an image reading part arranged on the back of the contact glass 2. A cleaning roller 9 is provided on the side of the read face of the document, at the upstream side in the carrying direction of the document beyond the document holding roller 1. The cleaning roller 9 is rotated faster than the carrying speed of the document to the same direction of the document holding roller 1 without preventing the movement of the document.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original moving type reading apparatus in which an original moves on an image reading section.

[0002]

2. Description of the Related Art Conventionally, since an original is large in an industrial copying machine, a moving original reading apparatus is used rather than a fixed original reading apparatus in order to reduce the size of the apparatus. As a typical type of the original moving type reading apparatus, an original is conveyed with the image side facing down, and is passed through a gap between an original holding roller and a contact glass on an image reading unit (hereinafter referred to as a CCD). Therefore, there is a method of reading an image of a document.

In such a document moving type reading apparatus, when a document passes through a gap between a document pressing roller and a contact glass, an adhering substance attached to an image surface side may adhere to the contact glass. If this deposit just adheres to the reading position of the CCD, it always appears on the image when reading the original. For this reason, even if the attached matter is minute, it appears in the copy image as a line extending in the entire transport direction, that is, a so-called black stripe, and it is impossible to read the image faithfully.

[0004]

Therefore, the present applicant has
There has been proposed an original moving type reading apparatus in which an original guide plate provided with an original cleaning member is provided upstream of the original pressing roller and on the original reading surface side. However, in the above-described original moving type reading apparatus, the original cleaning member removes dust from the original by contacting the original with the original. Adhere to. For this reason, when the amount of dust attached to the document cleaning member exceeds the limit, the dust is transported to the downstream side and contributes to the generation of black stripes. Since the amount of dust attached increases in proportion to the size of the document cleaning member, the size of the apparatus may be increased, but the size of the apparatus is limited. Therefore, it is necessary to frequently clean the document cleaning member.

Further, since the original cleaning device is provided at a position where the conveyance of the original is obstructed, the original may be broken due to the fact that the leading end of the original strikes the original cleaning device when the original is sent. .

Further, since the document cleaning member is fixed, the conveying speed of the document must be increased in order to increase the dust cleaning force.

SUMMARY OF THE INVENTION An object of the present invention is to provide an original moving type reading apparatus which can reduce the frequency of removing dust adhering to the original cleaning member and can prevent the original from being broken by the original cleaning member.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, an original is passed between a contact glass and an original pressing roller from above an original guide plate, and is placed on a back surface of the contact glass. In a document moving type reading device that reads an image of a document moving on an image reading unit disposed, a document cleaning member that rotates faster than the document conveying speed in the same direction as the document pressing roller is provided, compared with the document pressing roller. It is characterized by being provided on the reading surface side of the original document upstream of the original conveying direction.

According to the first aspect of the present invention, since the document cleaning member is provided at the upstream of the document pressing roller and on the side of the document reading surface, the document cleaning member rotating faster than the document conveying speed in the same direction as the document pressing roller. The cleaning member contacts the document while rotating, and has a large area in contact with the document. Therefore, the amount of dust attached to the document cleaning member increases, and the frequency of cleaning the document cleaning member is greatly reduced. Also, the document cleaning member is rotated faster than the document transport speed in the same direction as the document transport direction, so that the document cleaning member does not hinder the document transport,
Performs smooth document transport without document folding.

According to a second aspect of the present invention, an original is passed between an original guide plate and a contact glass and an original pressing roller to read an image of an original moving on an image reading section arranged on the back surface of the contact glass. In the original moving type reading apparatus, an original cleaning member that rotates in a direction opposite to the original pressing roller is provided upstream of the original pressing roller in a conveying direction of the original and on a surface to be read of the original. It is assumed that.

According to the second aspect of the present invention, since the document cleaning member that rotates in the opposite direction to the document pressing roller is provided upstream of the document pressing roller and on the document reading surface side, the document cleaning member rotates while rotating. The contact area with the original is large. Therefore, the amount of dust attached to the document cleaning member increases, and the frequency of cleaning the document cleaning member is greatly reduced. Further, since the peripheral speed difference between the document conveying speed and the rotation of the document cleaning member is greater than that of the invention described in claim 1, the force for removing dust from the document is increased, and even dust having a large adhesive force to the document is obtained. remove.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a driving unit for rotating the original cleaning member is connected to a drive transmission between the original cleaning member and the driving unit. And an intermittent clutch.

According to the third aspect of the present invention, the drive transmission between the document cleaning member and the driving means can be connected and disconnected by the operation of the clutch, and the rotation of the document cleaning member can be stopped arbitrarily. By stopping the rotation of the document cleaning member when a portion where the document is likely to be folded or torn is in contact with the document cleaning member, the document can be prevented from being broken or torn regardless of the rotation direction of the document cleaning member.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail with reference to FIGS.

An original moving type reading apparatus 10 according to the first embodiment shown in FIG. 1 includes a contact glass 2 on which an original is conveyed on its main surface. On the back side of the contact glass 2, an image reading unit (CCD) 3 is arranged.
A document pressing roller 1 is disposed on the main surface side of the contact glass 2 so as to face the image reading unit 3. A gap is provided between the document pressing roller 1 and the contact glass 2 to hold the document.

A pair of upper and lower transport guide plates (original) for introducing an original between the original pressing roller 1 and the contact glass 2 are provided upstream of the original pressing roller 1 in the original conveying direction indicated by an arrow A shown in FIG. Guide plates) 4 and 6 are provided. The transport guide plates 4 and 6 are provided with transport roller pairs 5a and 5b for nipping and transporting the original.

On the other hand, the document pressing roller 1 and the contact glass 2
And a pair of upper and lower paper discharge guide plates 7a and 7b for leading out the document discharged from the space between the paper discharge guide plates 7a and 7b. Paper ejection guide plate 7
a and 7b include a pair of discharge rollers 8 for nipping and transporting the original.
a and 8b are provided.

As shown in FIG. 2, a cleaning brush 9 as a document cleaning member is provided on the lower transport guide plate 6 of the transport guide plates 4 and 6, and a cleaning brush provided on the transport guide plate 6. It is arranged so that a part thereof protrudes from the hole 6a to the document conveying surface side. The width of the cleaning brush 9 is set to be larger than the maximum allowable width of paper passing.

As shown in FIG. 3, the cleaning brush 9 is held by side plates 43a and 43b of the original moving type reader 10, and a driving pulley 44 is connected to one end of the cleaning brush 9. As shown in FIG.
The drive is transmitted via a timing belt 46 from a drive pulley 45 connected to the end of the transport roller 5b. As a result, the cleaning brush 9 rotates in the same direction as the transport roller 5b. Further, since the drive pulley 44 of the cleaning brush 9 has a smaller diameter than the drive pulley 45 of the transport roller 5b, the cleaning brush 9
It rotates faster than b. Therefore, the cleaning brush 9 rotates faster than the document conveying speed.

Here, the timing belt 46 is used as a means for transmitting the drive. However, if the cleaning brush 9 rotates faster than the transport roller 5b in the same direction as the transport roller 5b, a gear pair is used. The same effect can be obtained.

The basic operation of the original reading apparatus 10 according to the first embodiment having the above-described configuration will be described with reference to FIG. An original having image information is inserted into the original reading apparatus 10 in the original transport direction A with the image side facing down.
The document is nipped between the pair of transport rollers 5 a and 5 b and transported between the transport guide plates 4 and 6. When the leading edge of the document 11 reaches the document pressing roller 1 and the contact glass 2, the CCD 3
To start reading image information. Thereafter, the document is nipped by the pair of discharge rollers 8a and 8b, and the discharge guide plates 7a and
7b, the document is ejected out of the apparatus, and the reading operation ends.

In the above-described basic operation, when there is an adhered substance on the image surface of the original, when there is dust on the image side of the original, the original comes into contact with the cleaning brush 9, and the original conveying speed and the cleaning brush 9 Dust on the surface of the document is scraped off due to the difference in peripheral speed from the rotation. The scraped dust adheres to the surface of the cleaning brush 9 or falls into a dust receiver (not shown) from the cleaning brush hole 6a.

Since the cleaning brush 9 is provided upstream of the document pressing roller 1 in the document conveying direction A, the contact pressure between the document and the cleaning brush hardly changes depending on the thickness of the document. Deposits can be removed without formation.

Here, as shown in FIG. 5, the cleaning brush 9 protrudes from the document transport position, but rotates faster than the document transport speed in the same direction as the document transport direction (A). Document movement can be prevented.

The bristles 9a of the cleaning brush 9 are planted on the circumference of the rotation shaft 9b of the cleaning brush 9 and come into contact with the document while rotating. Therefore, the area where the cleaning brush 9 contacts the document is large. Therefore, the amount of dust attached is larger than that of a flat and non-rotating original cleaning member, and the frequency of cleaning the original cleaning member is greatly reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 6, in the original moving type reading apparatus according to the second embodiment, a driving gear 61 is provided at an end of the cleaning brush 9, and a driving gear 63 provided at an end of the transport roller 5b. The drive is transmitted via the intermediate gears 65 and 67 to rotate in the opposite direction to the transport roller 5b. Here, two intermediate gears are used as means for transmitting the drive, but the same effect can be obtained by using an even number of intermediate gears.

In the second embodiment, the cleaning brush 9
Further, it is preferable to select and use a material having a hardness which does not hinder the conveyance even when the original having the weakest stiffness of the paper type permitted by the present apparatus is conveyed, thereby preventing the original from being broken.

The configuration and the basic operation other than those described above are the same as those of the first embodiment, and the description is omitted.

In the original reading apparatus according to the second embodiment, the bristles 9 of the cleaning brush 9 are provided as in the first embodiment.
a is planted on the circumference of the rotating shaft 9b of the cleaning brush 9 and contacts the original while rotating.
Has a relatively large area in contact with the original, the amount of dust attached thereto is larger than that of a flat and non-rotating original cleaning member, and the frequency of cleaning the original cleaning member is greatly reduced.

Further, the cleaning brush 9 and the transport roller 5b
Since the rotation in the opposite direction, the peripheral speed difference between the two is larger than that in the first embodiment, so that it is possible to scrape off dust having a large adhesive force to the document.

Next, a third embodiment of the present invention will be described with reference to FIG.

In the original reading apparatus according to the third embodiment, a driving gear 71 is provided at an end of the cleaning brush 9. A drive gear 73 and an electromagnetic clutch 75 are provided at an end of the drive roller 5b. On the other hand, intermediate gears 77 and 79 are provided between the drive gears 71 and 73,
Drive is transmitted from a drive gear 73 provided at an end of the transport roller 5b via intermediate gears 77 and 79, and the cleaning brush 9 rotates in a direction opposite to that of the transport roller 5b.

The electromagnetic clutch 75 is connected to a control means 81, and the control means 81 is connected to a document detection sensor 83. The document detection sensor 83 detects that the leading end of the document has passed over the cleaning brush 9 and controls the control unit 81.
The detection signal is output to the CPU. Further, the control means 81 can operate the electromagnetic clutch 75 in accordance with the detection signal to connect or disconnect the transport roller 5b and the drive gear 73.

In the third embodiment, two intermediate gears are used as the means for transmitting the drive. However, the same effect can be obtained by using an even number of intermediate gears. The same effect can be obtained regardless of the position of the electromagnetic clutch 75 in the drive system.

In the original reading apparatus according to the third embodiment having the above configuration, the electromagnetic clutch 75 is normally in the intermittent state, and the cleaning brush 9 is stopped. A document is inserted between the transport rollers 5a and 5b, transported, and a document detection sensor 8 detects that the leading end of the document has passed over the cleaning brush 9.
3, and outputs a detection signal to the control means 81. The control means 81 operates the electromagnetic clutch 75 in accordance with the detection signal from the document detection sensor 83, connects the transport roller 5b and the drive gear 73, rotates the cleaning brush 9, and scrapes off dust attached to the document. . Therefore, even if the original is weak, the rotation of the cleaning brush 9 can be started after the leading end of the original has passed over the cleaning brush 9 due to the conveyance of the original. Can prevent the original from being broken. Therefore, according to the original moving type reading apparatus of the third embodiment, the cleaning brush 9 is stopped when the original is likely to be broken or the original is likely to be torn.
Even if is rotated in the direction opposite to the transport direction, it is possible to prevent the document from being broken or the document from being torn while maintaining the dust removing ability. Further, since the material of the cleaning brush 9 can be selected from the viewpoint of removing dust regardless of the paper type of the document, it is possible to scrape off dust having a large adhesive force to the document.

In the cleaning brush 9 according to the third embodiment, similarly to the first and second embodiments, the bristles 9a are planted on the circumference of the rotating shaft 9b of the cleaning brush 9, and the original is rotated while rotating. Since the cleaning brush 9 has a relatively large area where the cleaning brush 9 comes into contact with the document, the amount of dust attached thereto is larger than that of a flat and non-rotating document cleaning member, and the frequency of cleaning the document cleaning member is greatly reduced. .

The present invention is not limited to the above embodiment,
Various changes can be made without departing from the spirit of the present invention. For example, the electromagnetic clutch 75, the control unit 81, and the document detection sensor 83 according to the third embodiment may be combined with the document moving type reading device according to the first embodiment.

In the first to third embodiments, the cleaning brush 9 is rotated by transmitting the drive of the transport roller 5b. However, a separate rotation driving means may be provided.

[0039]

As described above, according to the first aspect of the present invention, a document cleaning device which rotates faster than the document conveying speed in the same direction as the document pressing roller on the document reading surface upstream of the document pressing roller. Since the member is provided, the frequency of cleaning the document cleaning member is greatly reduced, and the document can be smoothly transported without the document being broken.

According to the second aspect of the present invention, since the document cleaning member which rotates in the opposite direction to the document pressing roller is provided upstream of the document pressing roller and on the document reading surface side, the frequency of cleaning of the document cleaning member is increased. Is greatly reduced, and dust having a large adhesive force to the document can be removed.

According to the third aspect of the present invention, the rotation of the document cleaning member can be arbitrarily stopped by connecting and disconnecting the drive transmission between the document cleaning member and the driving means by the operation of the clutch. Breaking and document tearing can be prevented.

[Brief description of the drawings]

FIG. 1 is a layout diagram showing a first embodiment of a moving original reading apparatus of the present invention.

FIG. 2 is a perspective view showing a main part of the original moving type reading apparatus according to the first embodiment of the present invention.

FIG. 3 is a layout view showing a main part of the original moving type reading apparatus according to the first embodiment of the present invention;

FIG. 4 is a layout view showing a main part of the original moving type reading apparatus according to the first embodiment of the present invention;

FIG. 5 is a cross-sectional view illustrating a main part of the original moving type reading apparatus according to the first embodiment of the present invention.

FIG. 6 is a perspective view illustrating a main part of a moving original reading apparatus according to a second embodiment of the invention.

FIG. 7 is a perspective view showing a main part of a moving original reading apparatus according to a third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 document holding roller 2 contact glass 3 image reading unit 4, 6 transport guide plate (document guide plate) 5 a, 5 b transport roller pair 6 b cleaning hole 7 a, 7 b discharge guide plate 8 a, 8 b discharge roller pair 9 cleaning brush 10 document Movable reading device 42 Cleaning brush hole 43a, 43b Side plate 44, 45 Drive pulley 46 Timing belt 47 Charging roller 81 Control means 83 Document detection sensor

Claims (3)

[Claims] 1. An original moving type reading device for reading an image of an original moving on an image reading unit disposed on a back surface of the contact glass by passing the original from between an original guide plate and a contact glass and an original pressing roller. A document cleaning member that rotates faster than the document conveying speed in the same direction as the document pressing roller is provided on the read surface side of the document upstream of the document pressing roller in the document conveying direction. Characteristic document reading device. 2. A document moving type reading device for reading an image of a document moving on an image reading unit arranged on a back surface of the contact glass by passing a document from between a document guide plate and a contact glass and a document pressing roller, A document moving type reading device, wherein a document cleaning member that rotates in a direction opposite to the document pressing roller is provided upstream of the document pressing roller in a direction in which the document is transported and on a surface to be read of the document. . 3. The apparatus according to claim 1, further comprising: a driving unit for rotating the document cleaning member; and a clutch for connecting and disconnecting a drive transmission between the document cleaning member and the driving unit. 3. The original reading device according to item 2.