JPS60242764A - Carrying equipment of sheet material - Google Patents

Abstract

PURPOSE:To read accurately an original sheet with small size or a transparent original sheet by bringing a recording means into contact with a discharge roller and providing a white background region covering sufficiently the read position to the recording means. CONSTITUTION:A transmitted original is irradiated by a light source 27 and a reflected original image is read by a photodetector 30 via a mirror 28 and a condenser lens 29. A part shown in a caption 32a in Fig. is a white background for read and a part shown in a cpation 32b is a heater comprising a lot of heat resistors. After an original is set correctly, when a transmission button (not shown) is depressed, a packup roller 22 is descended by a drive means in contact with the upside of the original 19a, and the original 19a is fed to the direction of arrow A. The original 19a fed to the read position is irradiated by a light source 27, its reflected light is read by the photodetector 30 and the original 19a is ejected onto a tray 33.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a conveying device, and more particularly to a sheet material conveying device configured to prevent errors in reading original sheets.

[Prior Art] Sheet material conveyance devices are used in copying machines, facsimile machines, and the like. For example, FIG. 1 shows the configuration of a document conveyance system and a recording paper conveyance system in a conventional facsimile machine.

In FIG. 1, the reference numeral 1 indicates a document, which is placed on a document table 2. As shown in FIG.

When the original 1 is placed on the original platen 2, the original 1 pushes down the sensor 3, and the placement of the original is detected and this is notified to the apparatus.

In this state, when a start button (not shown) is pressed, the document 1 is fed by the pickup roller 4 from above toward the paper feed rollers 6 and 7, and is sandwiched between them. sent to.

The sent original l is irradiated with light s8, and the reflected light is read by a reading means 9 consisting of a solid-state image sensor or the like using mirrors 8a and 8b.

When the leading edge of the document passes the reading position, the paper ejection roller 10.11
and is ejected onto the tray lz.

On the other hand, the roll-shaped recording paper 13 placed inside the main body of the apparatus is detected by the sensor 14 and sent to the thermal head 15 side.

The recording paper 13 is subjected to appropriate pressing force by a platen roller 16 and a thermal head 15, which is an image forming means, for recording.

Subsequently, the recording paper 13 is fed toward the cutter 17, cut at a predetermined position, and discharged onto the tray 18.

Devices having such document and recording paper conveyance systems are widely used.

Various improvements have been made to these devices to reduce their size and cost, but as long as roll paper is used as recording paper, there is a limit to how small the devices can be made.

In other words, if you reduce the diameter of the roll paper in an attempt to downsize the entire device, the curl of the recording paper will become tighter and the recording paper will not be fed straight, making jams and other problems more likely to occur. It becomes difficult to set the roll paper.

Therefore, as long as roll paper is used, there is a limit to the miniaturization of the device.

On the other hand, as devices become smaller, motors and their deceleration mechanisms that constitute the transport system for not only roll paper but also originals and recording paper,
Furthermore, the proportion of space occupied by the cutter device becomes extremely large.

That is, as long as the structure shown in FIG. 1 is employed, it is extremely difficult to significantly reduce the size.

[Objective] The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and provides a sheet material conveying device that can be miniaturized and configured so that reading errors of original sheets do not occur. is intended to provide.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

Figure 2 and the following diagrams explain one embodiment of the present invention, and the reference numeral 19a in each figure is a sheet-like original (original sheet).
What is indicated by 19b is a recording paper (recording sheet) of a cut sheet. Both are placed on the same document table 20.

A document (original sheet) or recording paper (
There is a sensor that detects whether a recording sheet (recording sheet) is set on the document table.
A pickup roller is arranged to feed the paper to paper feed rollers 24 and 25.

In addition, the pickup roller 22 and the paper feed roller 24, 25
A friction piece 23 is disposed between t' and the document table 20 to prevent double feeding of the document 19'a or the recording paper 19b.

Note that among the paper feed rollers 24 and 25, the roller indicated by the reference numeral 24 is a roller that feeds the document etc. in steps at a predetermined speed.
Reference numeral 25 is a roller that is pressed against this. .

On the downstream side of the paper feed rollers 24 and 25, there is a paper feed roller 24.2.
A paper edge detection sensor 26 is disposed to detect the leading edge or trailing edge of the original document etc. sent by the paper feeder 5.

The sent document is illuminated by a light source 27, and the reflected document image is reflected by a mirror 28. The light is read by the light receiving element 30 through the condensing lens 29.

A platen roller 31 is arranged on the paper discharge port side of the apparatus. The platen roller 31 is a roller that feeds the document at the same speed as the roller 24 and discharges the document.

A thermal head 32 is placed above the platen roller 31.
(recording means) is arranged.

The thermal head 32 is pressed against the platen roller 31 by a spring (not shown).

A tray 33 for receiving both original documents and recording paper is provided at the paper discharge port.

FIG. 3 shows details of the thermal head 32.

In FIGS. 3(A) and 3(B), the part indicated by the reference numeral 32a is a white background for reading, and the part indicated by the reference numeral 32b is a heating element consisting of a large number of heating resistors.

Next, the operation of this embodiment configured as above will be explained.

First, the case of document transmission will be explained.

When the transmission original 19a is set on the original platen 20, the leading edge of the original presses down on the sensor 21, so that the apparatus detects that the original is set.

At this time, if the document 19a is improperly set, the device cannot detect the document, so it is necessary to display the area where the document is to be set on the document table 20 with an index or the like.

After correctly setting the original, when a send button (not shown) is pressed, the pickup roller 22 is lowered by a driving means (not shown) so as to come into contact with the original 19a, and moves in the direction of arrow A.
The document 19a starts to be fed in the direction shown in FIG.

The pickup roller 22 is mounted at a position somewhat closer to the direction of arrow B than the sensor 21 so that all the set documents can be fed.

In addition, since the pickup roller 22 constitutes an automatic paper feeding mechanism by utilizing the difference in the coefficient of friction between the pickup roller 22 and the friction piece 23,
Pickup roller 22, friction piece 23, and document 19a
There is the following relationship between the friction coefficients of (recording paper 19b).

Pickup roller 22 and original 19a (recording paper 19b)
Coefficient of friction between original 19a (recording paper 19b) and friction piece 23> Coefficient of friction between original 19a (recording paper 19b).

In this way, the pickup roller 22 uses the above-mentioned difference in friction coefficients to feed the stacked documents one by one from the top to the paper feed rollers 24 and 25.

The pickup roller 22 moves up when the leading edge of the document 19a is detected by the paper edge detection sensor 26, and when the next document still remains on the document table 20, the trailing edge of the document is detected by the paper edge detection sensor 26. Then, it falls onto the next document again and feeds the document in the direction of arrow A.

When a document is held between paper feed rollers 24 and 25 and sent out at a predetermined speed, the leading edge of the document is guided by a fluttering thermal head 32 and conveyed to a reading position.

The original 19a that has been sent to the reading position is irradiated by the light source 27, the reflected light is read by the light receiving element 30, and the original 19a is discharged onto the tray 33.

All the originals are sent out by repeating the above operations.

It goes without saying that the heating resistor of the thermal head 32 is not operated during transmission.

On the other hand, in the case of document reception, when the recording paper is stacked on the document table 20 and the receive button is pressed, the recording paper 19b is sent out in exactly the same way as in the case of document feeding, so the explanation will be omitted. However, at the time of reception, of course, the reading optical system stops functioning, and the heating element 32b of the thermal head 32 generates heat based on the received image information to color the recording paper made of thermal paper and perform recording.

The recording paper on which recording has been completed is fed onto the tray 33.

As described above, the sheet material conveying device according to the present invention is configured so that it can be used as a single conveying system for original sheets and recording sheets, so the number of parts can be reduced and the device can be made more compact. Cost reduction can be achieved.

Since there is only one conveyance system, even if a jam or the like occurs, there is no need to open two conveyance systems as in the conventional case, and the jam can be cleared by opening only one conveyance system.

Furthermore, since the transmission original and the recording paper are placed on a common table, operability is improved and the number of parts is reduced, making it possible to downsize.

In addition, in conventional devices, the space to store recording paper, especially roll paper, was an obstacle to miniaturizing the device, but in the present invention, the document table is placed outside and can be used only when necessary. By adopting a configuration that uses , significant downsizing has become possible.

Furthermore, since the paper discharge roller and the platen roller are commonly used, the number of rollers can be reduced, the conveyance system can be shortened, and the apparatus can be made smaller.

In addition, the document surface does not come into contact with the heating element side of the thermal head.
Since it comes into contact with the platen roller side, no sliding friction occurs with the heating element, and even when writing in pencil, for example, there will be no inconvenience such as pencil dust scattering and staining the document.

Furthermore, as devices become faster, there is a desire for recording paper that can produce color even when the temperature of the heating element of the thermal head is relatively low. Color develops due to force. On the other hand, the friction piece 23 is required in order to stack a plurality of recording sheets and separate and feed them one by one. Therefore, if the recording surface is on the lower side, there is a risk that the recording paper will be rubbed by the friction piece 23 and colored.

However, in the present invention, the recording surface is placed on the upper side, the thermal head is also placed on the upper side, and the recording surface is configured to only contact the pickup roller, so that no color develops.

Further, a guide plate 32c is provided on the lower surface of the thermal head 32 in order to suppress flapping of the paper.

As a result, there is no need to provide a completely separate guide plate as a paper guide, so the number of parts can be reduced and the installation space for the guide plate can be shortened.

In addition, if the document size is small or the document is transparent, if the back side of the document is recorded as not white, black may appear on both edges or the image information may be destroyed, and the amount of light may change due to changes in the light source over time. Image information cannot be read accurately.

Therefore, in the present invention, by providing the white background portion 32a with uniform whiteness, accurate reading of image information is made possible.

Although the above description has been made using a facsimile machine as an example, the present invention can be applied to general image forming apparatuses capable of reading and recording, and particularly to sheet material processing apparatuses in general, and the reading optical system may also be a mirror or the like. lens or C
Not only an image reading element such as an OD, but also a contact type sensor or other reading means may be used.

Further, although the recording means has been described using a thermal head as an example, it is not limited to a thermal head, but an inkjet method, a wire dot method, or other methods can be adopted.

Furthermore, the recording medium is not limited to paper, and may be other sheet-like materials.

[Effects] As is clear from the above description, according to the present invention, the recording means is brought into contact with the delivery roller, and a blank area sufficiently covering the reading position is provided on the recording means side, so that the size can be reduced. An excellent effect can be obtained in that even a small original sheet or a transparent original sheet can be read accurately and no reading errors occur.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a conventional facsimile machine, and FIGS. 2 and 3 illustrate an embodiment of the present invention.
The figure is a longitudinal side view, FIG. 3(A) is a rear view of the thermal head, and FIG. 3(E) is a side view of the thermal head.

Claims (1)

[Claims] In a conveyance device that uses a cut sheet as a recording medium and conveys the recording sheet and the original sheet in the same direction, a feeding roller that conveys the recording sheet at a predetermined speed is installed on the front side of the reading position of the original sheet, and What is claimed is: 1. A conveyance device for sheet material, characterized in that a discharge roller for conveying the sheet material is provided, a recording means is brought into contact with the discharge roller, and a blank area sufficiently covering a reading position is provided on the side of the recording means.