JPS63299671A - Reader - Google Patents

Abstract

PURPOSE:To keep the subscanning accuracy to a high value by adding a guide mark to a carrier sheet carried with an original in a facsimile equipment, reading the guide mark at the time of carrying the original and controlling the carrier means based on the read information. CONSTITUTION:An original 34 is inserted between a base sheet 31 and a transparent sheet 32 at first in a way that a guide mark 34 does not line in hiding. An image sensor 51 reads the original 34 and the guide mark 33 to generate a 1-line read end signal and a mark read signal. Then an original carrying quantity correction circuit 54 fetches the mark read signal, compares it with a reference movement quantity to discriminate whether or not the original 34 is carried correctly. When it is discriminated that 'original 34 is carried by a proper quantity', a correction signal signifying correction quantity '0' to an original carrier control section 55, which controls a motor drive section 42 according to the one-line read end signal to carry the original 34 by a prescribed quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reading device applied to facsimile machines and the like.

2. Description of the Related Art As an example of a conventional reading device, those shown in FIGS. 4 and 5 are known.

In FIG. 5, 1 is a mount, 2 is a transparent sheet stuck to the upper end of the mount 1, and 3 is an original inserted between the mount 1 and the transparent sheet 2.

In this state, the document 3 inserted between the mount 1 and the transparent channel 2 is moved between a pair of transport rollers 4 as shown in FIG.
inserted into. Then, the conveying roller 4 is driven and rotated by the motor 6 via the belt 5 to convey the original 3 to a predetermined position.

The original 3 set at a predetermined position is read by the image sensor 8 via the lens 7. And image sensor 8
A read signal is taken into the read circuit 9 from the read signal.

The reading circuit 9 outputs a one-line reading end signal to the document conveyance control section 10 every time one line of the reading signal is read.

When the document conveyance control section 10 receives the one-line reading end signal, it outputs the document conveyance signal to the motor drive section 11.The motor drive section 11 drives the motor 6 with a drive signal every time it receives the document conveyance signal, and drives the motor 6 to drive the roller. 4 to convey the document 3 by one line. The new line is then read as described above. Then, the above-described operation is repeated over all lines to complete reading of the original 3.

Problems to be Solved by the Invention However, the above-mentioned reading device has a problem in that the side-scanning reading accuracy is not very high.

The above problem arises for the following reasons. That is, motor 7
There is a limit to the accuracy of transferring and stopping the belt, and this limit suppresses the accuracy. Also, the rattling of the belt 6 causes the driving force of the motor 7 to fluctuate, resulting in a decrease in accuracy, or the roller The reading accuracy is reduced due to the influence of the dimensional accuracy of the original 4 or the thickness of the original 3.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a reading device that can maintain high sub-scanning reading accuracy without being affected by the accuracy of each part or the thickness of the document. shall be.

Means for Solving the Problems In order to achieve the above object, the present invention provides means for transporting a document together with a carrier sheet provided with guide marks;
A means for reading the guide marks on the carrier sheet while the conveying means is conveying the document, a means for comparing the detection result of the reading means with a preset reference displacement amount, and a means for comparing the detection result obtained by the comparison means. and means for controlling the conveyance means.

Effects The present invention has the following effects due to the above structure.

That is, first, the document is conveyed together with the carrier sheet, and the guide marks are read during this conveyance. and,
This reading result is compared with the reference displacement amount, and the conveyance means is controlled based on the comparison result, so that the document is always conveyed along the reference displacement amount.

Embodiment FIG. 1 is a schematic diagram showing the configuration of a reading device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a carrier sheet applied to the reading device.

In FIG. 2, 31 is a rectangular mount slightly larger than the original M, 32 is a transparent sheet with the same shape as the mount 31,
Guide marks are attached in a row at predetermined intervals on the side of the mount 31. In addition, the upper end of the transparent sheet 32 is attached to the mount 3.
], and is inserted and held between the mount 31 and the transparent sheet 31 so that the original tone does not cover the guide marks 33. In this embodiment, the carrier sheet 1 is made of a mount 31 and a transparent sheet 32.
-30.

In FIG. 1, 41 is a motor that rotates upon receiving a drive signal from a motor drive section 42, and 43 is a belt 44.
a drive-side conveyance roller 45 connected to the motor 41 via
is a driven-side conveyance roller that is disposed opposite to the drive-side conveyance roller 43 and inserts the carrier sheet I between the drive-side conveyance roller 43 and the driven-side conveyance roller 43 . In this embodiment, the drive side conveyance roller 4
3 and the driven conveyance roller 45 constitute a document conveyance roller 46.

An image sensor 51 is disposed near the document transport roller 46 and captures image information of the document 34 and the carrier sheet 30 line by line through a lens 52 to obtain a read signal, and 53 captures the read signal. At the same time, a line reading completion signal is generated for each line of the original 34 based on the reading signal, and a guide mark 33 included in the reading signal is generated.
a reading circuit for taking out a reading signal (mark reading signal); 54;
The standard movement amount is set in advance according to the interval between the guide marks 33 attached to the mount 31, and the two are compared by capturing the mark reading signal, and if there is a difference, correction is made according to the amount of difference. A document transport amount correction circuit 55 that outputs a signal takes in a 1-line reading end signal and a correction signal, corrects the 1-line reading end signal based on the correction signal, and uses this as a document transport signal to drive the motor drive section 42.
This is a document conveyance control section that controls the motor 41 by sending the signal to the motor drive section 42 to generate a drive signal.

The operation of the reading device configured as described above will be explained below with reference to the flowchart in FIG. 3.1) First, as shown in FIG. and the transparent sheet 32 and held.

With the document 34 held in this way, the carrier seat 43
0 is sandwiched between the driving side conveyance roller 43 and the driven side conveyance roller 45, and the motor drive section 42 is activated. Then, the motor 41 is driven to rotate the drive-side conveyance roller 43, and the carrier sheet 30 with the document sheet inserted therein is conveyed to a predetermined reading position.

In this state, the image sensor 51 reads the document mark and the guide mark 33 (step (hereinafter referred to as ST)).
1, 5T2), one line reading end signal and mark reading signal are generated.

Next, the document conveyance amount correction circuit 54 takes in the mark reading signal and compares it with the reference movement amount to determine whether the document has been conveyed correctly (ST3).

Here, if it is determined that each document has moved by an appropriate amount, a correction signal for a correction amount of 0 is sent to the document conveyance control section 55.

Then, the document conveyance control section 55 controls the motor drive section 42 in accordance with the 1-line reading end signal to convey the document by a predetermined amount (ST4).

On the other hand, if it is determined in ST3 that ``the original has not moved by an appropriate amount'', a correction signal indicating the amount of correction is sent to the original transport control section 55. Then, the document conveyance control section 55 corrects the 1-line reading end signal according to the correction signal, and transmits the correction result to the motor drive section 42 as a document conveyance signal.
Adjust the conveyance amount of the original (ST5).

Then, the operations of ST2 to ST5 are sequentially repeated for each line (ST6), and the reading of the original is completed by processing all the ins (ST7).

In this way, the amount of movement of the document 34 in the sub-scanning direction is always regulated to a predetermined amount, thereby improving the accuracy of sub-scanning reading.

In this embodiment, the guide mark is attached to the mount 3], but the guide mark may be attached to the transparent sheet 32. In addition, in this embodiment, the original is inserted between the transparent sheet and the mount, but the mount 1 is provided with a removable adhesive member such as Velcro, and the original is inserted into the mount via the adhesive member. 1 and the transparent sheet may be omitted.

In this embodiment, an example is given in which the document mark and the guide mark 33 are read by the same image sensor 51, but means for reading the guide mark 33 may be provided separately.

Effects of the Invention As is clear from the above description, the present invention attaches guide marks to a carrier sheet that is conveyed together with a document, reads the guide marks when the document is conveyed, and controls the conveyance means based on this read information. Therefore, the sub-scanning accuracy can be maintained at a high value regardless of the accuracy of each part of the apparatus or the thickness of the document.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of a reading device according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing a carrier sheet applied to the reading device, and FIG. 3 is an example of the operation of the reading device. Flowchart, FIG. 4 is a schematic diagram showing an example of a conventional reading device, and FIG. 5 is a schematic diagram showing a carrier sheet applied to the same reading device. 33...
Guide mark, 34... Original, 41... Motor, 4
3... Drive side conveyance roller, 45... Driven side conveyance roller, 46... Document conveyance roller, 51... Image sensor, 53... Reading circuit, 54... Document conveyance amount correction circuit, 55 River manuscript transport control unit. Name of agent: Patent attorney Toshio Nakao #1 is one person5
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The ark's side η-ra 4 evening troubles (carrying roller 46/dong-familiar row 2 30 carrier sea 1 .32 ``L Akiki-133 power station digit mark 34 atoms also Figure 3 Figure 4 Figure t, 2

Claims (1)

[Claims] A carrier sheet with guide marks attached thereto, a means for conveying the document together with the carrier sheet, a means for reading the guide marks on the carrier sheet conveyed by the conveying means, and a reference displacement amount previously provided, and the reading means A reading device comprising: means for comparing the detection result of the reference displacement amount with the reference displacement amount; and means for controlling the conveyance means based on the comparison result obtained by the comparison means.