JPH02198941A - Original transporting device for image read-out device - Google Patents

Abstract

PURPOSE:To scan an original having an arbitrary thickness by supporting a platen roller so as to be vertically moved for a platen glass and pressing the original by a certain force. CONSTITUTION:The side plates 22 and 22a which support a platen roller 25 are supported in swingable manners by a pin 31 through brackets 21 and 21a installed on a frame 20, and the parts projecting to the downstream sides of the upper parts of the side plates 22 and 22a are urged upwardly by springs 30 and 30a, and the pressing force by the platen roller 25 is set to a certain value. When an original is inserted into between the platen roller 25 and a platen glass 10, the platen roller 25 is lifted up according to the thickness of the original, and the side plates 22 and 22a are swung around a shaft 32, and move the platen roller 25 vertically, and the gap of the platen roller 25 for the platen glass 10 is allowed to correspond to the thickness of the original, and the pressing force is kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a document conveying device in an image reading device, and in particular, in an image reading section, a platen roller that presses the document toward a platen glass is used to move the document toward the platen glass. The present invention relates to a device that supports a document so that it can be moved up and down in accordance with the thickness thereof, and that allows the roller to press the document accurately.

(Prior Art) An image reading device that scans an image of a document while moving the document has conventionally been used for facsimiles and image reading devices.
This device is often used in image forming devices such as recording devices. In the document moving type image reading device described above, @the document is moved along the document transport path with the image side facing down, and a lamp or mirror is installed at the bottom of the platen glass provided in the middle of the movement path. An optical system device such as the above is arranged to scan an image of a document.

In the conventional image reading device described above, the original is pressed against the platen glass with a constant pressure, and the image is scanned with the image surface of the original accurately positioned with respect to the reading device. It will be done.

Then, as described above, place the original on the platen glass.
! ! By scanning the original while the original is attached, a clear read image can be obtained, and when the image information is reproduced as a copy, a high-quality copy can be obtained.

In order to achieve the above objective, in general image reading devices, the distance between the platen glass and the platen roller is
Formed to be narrow enough to allow one sheet of paper to pass through,
By providing the platen roller in a fixed position with respect to the frame, means are used to ensure accurate positioning of the paper in the reading section.

(Problems to be Solved by the Invention) However, in the conventional image reading device as described above, the distance between the platen glass and the platen roller is set to a very narrow distance that allows normal paper to pass through. Therefore, the platen roller cannot be moved up and down.

In addition, the paper used in image reading devices is not only of a certain thickness as is used for normal copying, etc.
It may range from thin materials such as tracing paper, to materials made by cutting out and stacking multiple sheets of paper, to thick materials such as Ghent paper or cardboard.

However, as mentioned above, when using a device in which the distance between the platen glass and the platen roller is set constant in the image reading area, the operation of pressing the document against the platen cover may not be accurate in the case of thin paper. Because it is not carried out in
A problem arises in that the read image becomes unclear.

Furthermore, in the case of thick originals, the paper may not be able to pass through the reading section, causing the problem that the image reading device described above cannot be used.

(Object of the Invention) The present invention solves the above-mentioned drawbacks of the image reading device, in which the platen roller is supported so that it can move up and down with respect to the platen glass, and the document can be pressed with a constant force. In this way, it is an object of the present invention to provide an apparatus that can scan a document of arbitrary thickness.

(Means and effects for solving the problem) The document conveyance device of the image reading device of the present invention has conveyance roller devices disposed upstream and downstream of the document image reading section, respectively, to convey the document. Image II is configured to read the image while moving the document! Relating to a reading device.

In the document conveyance device of the image reading device of the present invention, the platen glass and the platen roller are arranged to face each other,
An exposure device and an optical system device for transmitting image light toward a recording section are disposed below the platen glass, and the platen roller is configured to be able to press the document with a predetermined pressing force. , the platen roller is supported so that the distance from the platen glass can be changed depending on the thickness of the document.

Therefore, in the document conveying device of the present invention, the platen roller can be moved up and down while keeping the pressure with which the platen roller presses the document constant. The platen roller can perform a pressing action on the original document.

By pressing the original against the platen glass with a constant pressure, scanning can be performed with the image surface of the original accurately positioned, so the read image information is clear. It will be done.

(Embodiment) The configuration of a document conveying device of an image reading apparatus of the present invention will be described according to an illustrated example.

In the image reading device 1 of the present invention shown in FIGS. 1 and 2, the original loading path 2 arranged in the reading section is
An upper guide plate 3 and a lower guide plate 4 are arranged vertically at a predetermined interval to guide a document.

Further, in order to transport the original within the original transport path,
Conveyance roller devices 5 and 6 are arranged at the upstream and downstream portions of the image reading section, respectively, and each conveyance roller device is
It is composed of a drive roller and a pinch roller facing each other, and the document is scanned by a reading section while the document is conveyed in a nipped state.

As mentioned above, the reading device of the present invention is disposed between the conveyance roller device 5.6, and the exposure device is installed at the bottom of the platen glass 10 as in the case of a general reading device. 1111 is provided, and the exposure device 11 is
A lamp 12 and a reflector 13 are provided, and the light from the lamp 12 is collected by the reflector 13, and reflected light is obtained by irradiating the document moving on the platen glass 10.

A filter 19 is disposed at the output section of the light from the exposure device, and the light passing through the filter 19 is reflected by a plurality of mirrors 15 and 17, and the lens 1
6, and the photoreceptor drum 18 serving as an image carrier is irradiated with the image.

Note that the photosensitive drum is connected to a reading device for image formation.
This is used when directly connecting @, but in the case of a device configured to output the signal obtained by an image reading device as an electrical signal, a photoelectric drum such as COD etc. is used instead of the photosensitive drum. Conversion means can be provided.

In the image reading device 1 in which the exposure device as described above is arranged at the bottom, there is a main body frame 2 at the top of the document transport path 2.
0, and the platen row 525 is placed on the main body frame 20.
has been established.

The member supporting this platen roller 25 is a side plate 2 having the same shape as shown in FIGS. 1 and 2.
A platen roller 25 is supported at the bottom of the side plate 22.22a, and the platen roller 25 presses the original toward the platen glass 10. It consists of

Side plate 22.2 supporting the platen roller of the invention
2a is provided with a bracket 21.21a on the main body frame 20, and is swingably supported by the bin 31 via the bracket. A shaft 32 is disposed between the lower part of the side plate and the part projecting to the downstream side, and the side plate is supported by the bin 31 and the shaft 32.
The position can be adjusted. In order to allow the side plate to swing in a good condition, the part supported by the bin 31 is configured to be slidable by a long hole, etc., and the part supported by the shaft 32 is fixed.
Although it is possible to perform a swinging action about the axis 32, any other means may be used.

In the side plate of the present invention, the upper part of the side plate protruding toward the downstream side is urged upward by a spring 30, 30a,
The spring supports the template of the platen roller 25 and allows the pressing force of the roller 25 to be set to a constant value.

The side plate of the present invention and the platen row 525 supported by the side plate are, as shown in the front view of FIG. 3 and the bottom view of FIG. 4, the main frame 20. 20a. Further, the shafts 26 of the platen rollers 25 are supported by the side plates, and an upper shaft 33 is provided on the side plates. By these members, the side plates on both sides are oscillated in an interlocking manner, so that the distance between the platen roller 25 and the platen glass or the force with which the original is pressed can be set.

In the image reading device of the present invention, when an original is inserted between the platen roller and the platen glass, the platen roller is lifted according to the thickness of the original, so that the side plate is centered on the shaft 32. The platen roller 25 is oscillated to move the platen roller 25 up and down, and the distance between the platen roller and the platen glass is set in accordance with the thickness of the document, and the pressing force against the document is maintained constant.

If the document set in the reading device is thin, the distance between the roller and the platen glass is set according to the thickness of the document, so the platen roller presses the document and The reading operation can be performed while pressing the image surface toward the platen glass. Also,
If the document is very thick, such as a cardboard or cut-and-paste document, the platen roller is raised according to the thickness of the document, so that the document can be pressed.

Therefore, in the document conveyance device of the image reading device of the present invention, even if the thickness of the document changes, the platen roller can press the document at a position corresponding to the document, and the image surface can be pressed against the document. The document can be transported and read while being pressed against the glass.

The support system for the platen roller in the document conveyance device of the image reading device of the present invention may be configured as described above, or alternatively, a mechanism as shown in FIGS. 5 to 7 may be used. It is possible.

In the embodiments shown in FIGS. 5 to 7, FIG. 5 is a side view, FIG. 6 is a front view thereof, and FIG. 7 is a bottom view of the platen roller. In the embodiment of the present invention shown in FIG. 1, a bracket 21 is provided on the main body frame, and a lever 40 is provided so as to be slidable laterally with respect to the bracket 21.

This lever 40 is connected to a bin 46.46 provided on the bracket.
a is provided so that it can be slid into a long hole 45.45a provided in the lever, and two holes are provided on the upper surface of the lever 40.
A step guide surface 43.43a is provided, in which a pin 42 projecting from the side plate is engaged and is configured to act as a support for the side plate.

Further, in the side plate 22, a lower portion protruding toward the downstream side is supported by a shaft 32, similar to that shown in FIG. 1, and a platen roller is provided at a position corresponding to the platen glass 10. 25, and an exposure bag M11 is arranged on the lower surface of the platen glass.

In the image reading apparatus of the present invention configured as described above, when the original set on the original tray is a normal thin original, the bin 42 is supported on one guide surface 43 of the lever 40. When set, the platen row 52
5 and the platen glass 10 is narrow, so that thin originals can be transported.

On the other hand, if the document is thick, the lever 40 is slid downstream and the guide surface 43a of the lever 40 is
The bin 42 is set to be engaged with the portion. Then, by raising the bottle 42, the side plate 2
2, the platen roller 25 is raised, and the distance between the roller and the platen is set wide.

Therefore, when the platen 0-ra is raised as described above, thick originals, cut-and-paste originals, etc. can easily pass through the reading unit, and even in this state, the original can be placed on the platen glass. This means that the document can be pressed with a predetermined pressing force and the document can be fed in good condition.

As described above, in the document conveying device shown in the second embodiment of the present invention, there are two types of documents: thick and thin.
The position of the platen roller can be set depending on the type of document, so that the pressing action can be performed accurately on normal thin documents and thick documents.

In addition, in the above-mentioned side plate lifting mechanism, in addition to providing two guide surfaces on the lever 40, it is also possible to form three or more guide surfaces with different heights, etc. to improve the document used in the image reading device. The movement of the lever can be easily set by providing an indicator on the side of the main body frame.

Further, as shown in the embodiments, the image reading device of the present invention can be installed in the image reading section of an original such as an electronic copying machine. A device that inputs the input to a photoelectric conversion means such as and outputs it as a digital signal, a device that reads image information in the film,
Alternatively, it can be applied to devices such as facsimiles,
The use thereof is not particularly limited.

(Effects of the Invention) Since the document conveying device of the image reading device of the present invention has the above-described configuration, the member supporting the platen roller can be moved in the vertical direction, and the document conveying device by the platen roller can be moved vertically. This makes it possible to keep the pressing force constant.

Therefore, in the document conveying device of the present invention, the platen roller can be moved up and down while keeping the pressure with which the platen roller presses the document constant. The platen roller can be moved up and down to correspond to the size of the original.

By pressing the original against the platen glass with a constant pressure, scanning can be performed with the image surface of the original accurately positioned, so the read image information is clear. It will be done.

[Brief explanation of the drawing]

FIG. 1 is a side view of the device of the present invention, FIG. 2 is a back view thereof,
Figure 3 is a front view of the upper unit, Figure 4 is the upper unit)
5 is a side view of another embodiment of the present invention, FIG. 6 is a front view of its upper device, and FIG. 7 is its bottom view. Reference numerals in the figure 1...Image IIl reading a position, 2...Document transport path, 3, 4...Guide plate, 5, 6...
... Conveyance roller device, 10 ... Platen glass, 11 ... Exposure device, 20 ... Body frame, 21 ... Bracket, 22 ...・
...Side plate, 25...Platen roller, 3
0...Spring, 31...Bin, 3
2...Shaft, 40...Lever, 42...
····bottle. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Pico Figure 7

Claims (1)

[Scope of Claims] Conveyance roller devices are disposed upstream and downstream of the document image reading section, respectively, and configured to convey the document, and configured to read the image while moving the document. In the image reading device, a platen glass and a platen roller are arranged to face each other, an exposure device and an optical system device for transmitting image light toward a recording section are arranged below the platen glass, and the platen The roller is configured to be able to press the document with a predetermined pressing force, and the platen roller is supported so that the distance from the platen glass can be changed in accordance with the thickness of the document. A document conveying device for an image reading device.