JPH01127530A - Board writing copying device - Google Patents

Abstract

PURPOSE:To facilitate copying without need for using an original interposingly holding member and for using a long original conveying course by providing a board writing face sheet, an original feeding/conveying device, an optical system, and a copying device and providing a detecting means, a normal/reverse judging means, and a reversing means on the original feeding/conveying device. CONSTITUTION:A paper detecting sensor 2d is provided on the original feeding device 2 of an original feeding/conveying device 4 and, by detecting the front end and rear end of a sheet-formed original 9 by means of the sensor 2d while counting the counted number of a timer counter during this time, the fed paper length of the original is detected. Also, a normal/reverse judging means for judging the normal/reverse direction of an original conveying direction is provided to judge the normal/reverse direction of the conveying direction at the judging step of each flow in an operation mode. In a reversing means for reversing the original conveying direction, upper and lower rollers 5, 7 are reversed to reverse the original conveying direction, returning the original 9 to the original feeding device 2. Thereby, continuous copying and both side copying can be easily handled in a short time without need for using a long original conveying course, obtaining a proper copied image corresponding to the fed paper length of the original.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a board copying device, and particularly to a board copying device having a document feeding and conveying device.

[Conventional technology]

Conventionally, in this type of apparatus C, when copying a sheet original (hereinafter referred to as the original), a removable transparent sheet is constructed on a light-opaque board (hereinafter referred to as the board) that can be written and erased, A device has been used in which the original is held between the transparent sheet and the board and the board is rotated and transported by a drive device such as a roller, thereby transporting the original to a reading section of a copying machine and making copies.

However, with this copying device, the operation of holding the original between the transparent sheet and the board is complicated, and depending on the method of attaching the transparent sheet, the transparent sheet may lift up and cause shadows on the part of the original. Document transport may be delayed due to misalignment and damage caused by the driving device of the board sheet, repeated attachment and detachment to hold the original, or significant reduction in document holding power between the transparent sheet and the board due to eraser residue on the board. Somewhere along the way, there was a flaw that made it impossible to hold the original.

(Problems to be Solved by the Invention) As described above, in the conventional example, when copying a document by sandwiching it between a transparent sheet and a board, the operation of sandwiching the document is complicated, and the transparent sheet There have been problems such as raised shadows, the original being shifted and damaged, and the holding force being reduced, making it impossible to hold the original.

This invention was made in order to solve the above-mentioned problems of the conventional example, and it facilitates continuous copying and double-sided copying without using a document holding member such as a transparent sheet or a long document conveyance path. Moreover, it processes in a short time, shortens the document path when copying multiple sheets of small-sized originals, reduces damage to the originals, and makes it possible to obtain an appropriate copy image according to the length of the original. The purpose is to also facilitate handling of document jams on the feeding and conveying path.

(Means for Solving the Problem) Therefore, in the present invention, a board sheet that moves on the screen by rotation of upper and lower rollers, a document feeding device having a paper feeding roller, etc., and a ring 4I4II1 feeding roller, etc. are provided. A board copying apparatus comprising a document feeding and conveying device including a document feeding device, an optical system for copying image information written on the document and the board sheet, and a copying device, the document feeding and conveying device The above object can be achieved by providing a paper passing length detection means for detecting the paper passing length of the original, a forward/reverse judgment means for judging whether the original transport direction is normal or reverse, and a reversing means for reversing the original transport direction. This is what we are trying to achieve.

[Effect]

The board copying apparatus according to the present invention is provided with a paper passing length detecting means for detecting the paper passing length of the original in the y18i feeding/conveying device, so that a timer is set during the time when the leading edge and the trailing edge of the original pass through the paper detection sensor. The length of the document is detected by counting the number of counts on the counter.

Further, by providing a forward/reverse determining means for determining whether the document transport direction is forward or reverse, the forward or reverse direction of the transport direction is determined at each flow determination step in the operation mode.

Further, by providing a reversing means for reversing the document conveyance direction, the document conveyance direction is reversed and the document returns to the ffX paper feeder.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an explanatory longitudinal cross-sectional view of a board copying apparatus which is an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a flowchart showing each operation mode in this embodiment.
FIG. 4 is a layout diagram of the operation section of this embodiment, and in FIG. 1, ! is a board that is an embodiment of this invention! F copying device 2 has a paper feed roller 2e, a paper detection sensor 2d, etc.
A document feeding device that feeds a document; 3 is a document feeding port; 4 is a document feeding and conveying device that includes a document feeding device 2 and a document conveying device 6; 5 is a document feeder that moves a board sheet 8 and can be rotated in forward and reverse directions; 6 is a document conveying device having upper and lower rollers 5, 7 and a board sheet 8, etc., 7 is a lower roller that moves the board sheet 8 and is capable of forward and reverse rotation, 8 is a wide synthetic resin belt, etc. A board sheet (hereinafter referred to as a sheet), which is a white or light-colored flexible board member, is stretched between upper and lower rollers 5.7, 9 is a sheet-like document, and 10 is an exposure scanning position B. 11 is a first mirror, 12 is a second mirror, 13 is a lens, 14 is a shutter that opens to form an optical path when a document is detected by the paper detection sensor 2d, and 15 is in the copying device 16. An electrophotographic photoreceptor 16 is an original 4I49 and a photoreceptor 15 for copying image information written on a board. A commonly used copying device includes a charging device, a developing device, a transfer charging device, a cleaning device, etc. 17 is an abrasive unit for discharging JiiM from the device, and in FIG. 2, 2b and 2c are document feed El 3 guide, 2d
Paper detection sensor that detects the leading and trailing ends of TsujiylN4, 2e
2f is a shutter that regulates the leading edge of the document; 2g is a document conveyance roller; 6a is a guide for the document; 6b is a document conveyance roller that is capable of forward and reverse rotation; 6d is a conveyance belt. In each figure, the same reference numerals indicate the same or corresponding parts.

Next, the operation of this embodiment will be explained using FIGS. 1 to 4.

First, the case of copying information written on a board on the sheet 8 will be explained with reference to FIG.

First, the document feeding device 2 and the document conveying device 6 located around the sheet 8 are both separated from the sheet 8 by the groove 60 or the like. Desired information is written on the sheet surface A of the sheet 8 using an appropriate writing instrument, and the image information written on the board is illuminated and scanned by the lamp 10 at the exposure scanning position B by the rotation of the upper roller 5 and the lower rough. Ru. Next, in an optical system composed of a first mirror 11, a second mirror 12, and a lens 13, the light from the sheet 8 is reflected above the sheet 8 at the exposure scanning position 5!2B, and the light from the first mirror disposed above is reflected. The light is reflected downward through mirror 11 and second mirror 12, passes through lens 13, and is projected onto copying device 16. At this time, the shutter 14 provided in the copying device 16 is in an open state. In this way, the copying device 16
The light projected onto the electrophotographic photoreceptor 15 rotating in the direction of the arrow inside is transmitted to a charger, a developing device, a transfer charger, a cleaning device, and a transfer charger along the rotation path of the photoreceptor 15, as in normal copying. means for supplying transfer material to the container position;
The image is also copied by a fixing device that fixes the toner image transferred to the transfer material. Since this copying process is normally performed, its explanation will be omitted.

Next, the case of copying information on the original document 9 will be explained with reference to FIGS. 1 and 2, focusing on the paper passing length detecting means and the reversing means.

First, the document feeding device 2 and the document conveying device 6 are set at predetermined positions. Next, as shown in Figure 2, the original 4I4
9 is a guide 2b of the document feeder 2;

2C, and when the document 9 is detected by the paper detection sensor 2d, the shutter 14 (FIG. 1) provided in the copying device 16 opens, an optical path is formed, and the paper feed roller 2e moves in the direction e & 1 as shown in the figure. ``rotation (hereinafter referred to as forward rotation), original 4A9
is transported, the leading edge of the document stops at the position of the shutter 2f, and the leading edge of the document is regulated. Next, press the copy key 4g (fourth key) on the operation unit.
) is pressed, and after the leading edge of the document is synchronized with the leading edge position of the transfer material in the copying device 16, the shutter 2f is retracted from the document transport path.
A timer counter of a controller (not shown) that detects the number of counts during which the leading edge and trailing edge of a document pass a paper detection sensor, which is a first stage paper detection sensor that detects the length of paper passing through the document, keeps counting. The original lI 49 is the conveyance roller 2g of the document feeder 2 (FIG. 2) and the guide 6 of the document feeder 6.
a and the sheet 8, and is illuminated by a lamp IO at an exposure scanning position B. The light from the illuminated document surface is reflected upward from the document surface, reflected downward through the first mirror 11 and the second mirror 12, and projected onto the copying device 16 (FIG. 1) through the lens 13. It is copied in the same way as sheet side copying. After that, the document 9 is transferred to the document transport device g! When the trailing edge of the document 9 passes through the detection range of the paper detection sensor 2d, a timer of the controller (not shown) starts counting. After that, the paper passing length of the document 9 is detected by the number of counts from the start of the timer count, which is the paper passing length detecting means. If the length of the document 9 detected in this way is a short L'l document, which is less than half the length from the upper roller 5 to the lower roller 7, the trailing edge of the document 4F49 will be at the exposure scanning position B. After passing, the original 9 is returned to the original document feeding device 2 by a reversing means that rotates the upper and lower rollers and the like, and the original feeding and conveying device rotates in the direction f. If the length of the document is longer than 1/2 of the distance between the upper and lower rollers, the document feeding and conveying device does not rotate in reverse and continues to rotate forward. I49 is conveyed, and the paper is discharged from the paper discharge section 17 (FIG. 1) to the outside of the apparatus. After copying the original 4, press the shutter 1.
4 is closed.

Next, the operation of this embodiment will be explained with reference to the flowchart of FIG. 3 and FIG. .

In the flowchart of FIG. 3, flow IF shows the flow of the document copying operation described above as the basic operation.

Flow 2F shows the flow of continuous copying to make multiple copies from one original, flow 3F shows the flow of multi-sheet original copying to make copies of multiple originals, and flow 4F shows the flow of reversing the original feeding/conveying device. It shows the flow used to detect the length of document passing.

Below, each flow of marking will be explained.

(1) Basic operation flow IF.

The process starts in step 3a, detects the presence or absence of a document in step 3b, controls the leading edge of the document by the shutter 2f in step 3C, starts a timer count for the paper passing length detection means in step 3d, and starts the document in step 3e. Copying is performed, and in step 3f, the trailing edge of the original 9 is detected by the paper detection sensor 2.
When passing d, the timer count ends. Subsequently, in step 3h, which is a forward/reverse determining means for determining whether the original conveying direction is forward or reverse, the original is moved to 1/2 of the distance between the upper and lower rollers 5.7.
If it is YES, the process advances to step 31, and if it is determined that the document has passed the exposure scanning position point B, the process advances to step 3j, where the document conveyance device is reversed by the document conveyance device reversing means, and step 3 If it is determined that L'XIA has passed the shutter 2f, the document conveying device is stopped in step 3Il, and it is determined in step 3m that no copying is to be performed, and the process ends in step 3n. Also, if it is determined in step 3h, which is the forward/reverse determining means, that the document is not short, step 3
The process proceeds to u, the process proceeds to step 3v with the document conveying device in normal rotation, the document is ejected, the document conveying device is stopped in step 3w, and the process ends in step 3x.

Since the operation of the apparatus in each of the above steps has been described in detail above, repeated explanation of this flow will be omitted.

(2) Concerning the flow 2F of continuous copying in which multiple copies are made from one original.

First, the number of continuous copies is set using the increase/decrease key 4b (FIG. 4) on the operation section. At first, the basic operations described above, that is, the operation of the flow IF in FIG. 3, from step 3a to step 3m, in which the decision to copy is performed, are performed, and after the copying process is completed, the process proceeds to step 3p, where the leading edge of the document is regulated, and in step 39, the document is copied. Then, in step 3, the paper detection sensor 2d detects !i; f4
The trailing edge of A is detected, and in step 3i it is determined that the document has passed the exposure scanning position point B. In step 3j, which is a reversing means, the upper and lower rollers of the document conveying device are reversed, and the process proceeds to step 3, and this flow 2F This operation is repeated continuously according to the number of copies.

In this way, regardless of the document feeding length, after copying, the document 9 is returned to the document feeder 2 by the reversing means that reverses the upper and lower rollers of the document feeder and returns the document to the document feeder. Feed paper and perform copy processing.

In this case, the first basic operation (flow IF) has obtained the count number of the timer that determines the length of the document passing, and this is retained when refeeding the paper, and the operation without the timer count is performed in the basic operation. repeat.

(3) About the flow 3F of copying several pages of originals.

Starts in step 3a, and according to the basic operation (flow IF), proceeds to step 3g and ends the timer count. In step 3S, it is determined that the document has passed the exposure scanning position B, and in step 3, the u't'yXMat feeding device rotates in the normal direction. Proceed to step 3v and eject the original. Next, in step 3w, the document conveying device is stopped, and after finishing in step 3x, the process returns to step 3a to copy the next document, and this operation is repeated. If it is determined in step 3s that the document has passed the B roll, the process proceeds to step 3t, where the document feed 0KII,
Return to step 3a. In this case, the reverse rotation means of the document feeding/conveying device is not performed, and even if the document has a short feeding length, the document is conveyed and copied in the normal rotation. Also, after the original copying process, when the next original is inserted into the original feeding device 2 and detected by the paper detection sensor 2d, or when the copy key 4g and sheet feed key 4d of the operation section in Fig. 4 are pressed at the same time. If this is the case, it is determined that multiple originals are being copied, and the L'2M feeding/conveying device 4 only performs forward rotation operation according to the flow 3F described above.

If it is determined that the document feeder 4 will perform a reverse rotation, a warning lamp (not shown) will notify the operator to prevent the document from being erroneously inserted into the document feeder M2. The shutter 2j of the document insertion slot of the paper device 2 is connected to the yXM paper feed device 2.
It can be closed without blocking the conveyance path of yX9 returning to .

(4) Regarding flow 4F in which the reversing means of the document feeding and conveying device is used to detect the document passing length.

Start at step 3a, follow the basic operation (flow IF), proceed to step 3d, start timer count, proceed to step 3f without copying document 4, detect the trailing edge of document 4, and end timer count in step 3g. Then, the timer count number corresponding to the document feeding length is obtained, and the process proceeds to step 3y, where various processing is performed according to the head count number. Then, in step 3j, which is a reversing means, the document feeder is reversed, the document is returned to the document feeder 2, and the document is transferred again. Feed the paper and go to step 3.
After passing through step 3IL, it is determined that copying is to be performed at step 3m, and the process advances to step 3p, where the leading edge of the document is regulated, and step 3q.
to copy the original. Next, in step 3r, the trailing edge of the document is detected, the process returns to step 31, and in accordance with the basic operation (flow IF), the process proceeds to step 3n and ends. This flow 4F is executed by pressing the variable magnification key 4h (FIG. 4) on the operation section.

You can also specify the area of the document. In this case, if you keep pressing the copy key 4g and the upward feed key 4e on the operation panel in Fig. 4 at the same time, that side will be the original side to be copied, and you can keep pressing the copy key 4g and the downward feed key 4f at the same time. For example, during that time, it is possible to specify an area such that that side will not be copied, and by aligning the position of the area specification plate (not shown) in the document width direction of the document feeder 2 with the variable magnification key 4h, the operator's desired area can be specified. It is possible to obtain a proper image of.

Table 1 shows the characteristics related to each operation mode described above.

Table 1: Next, if the V or the tip of the document feeds and conveys the document in an accordion state and jams, the upper and lower rollers 5 of the document conveyance device
, 7, it is also possible to eject the jammed original out of the apparatus. It should be noted that a document conveying device provided around the board writing sheet 8 or near the scanning position,
By providing the original surface reversing section, the board copying apparatus of this embodiment also has the ability to copy double-sided originals.

Further, in this embodiment, a fixed type board cleaner (not shown) is used, but if this cleaner is a movable type that can come into contact with and retreat from the board sheet 8, the cleaner will move away from the board when the document conveyance device is reversed. Evacuate from document sheet 8 and move to board δ
The drive load for surface movement can be reduced, and eraser residue cleaned during normal rotation can be prevented from returning to the board writing sheet.

Furthermore, although an endless sheet is used as the board sheet 8 in this embodiment, it may also be a rollable sheet.

Furthermore, in this embodiment, the original JA9 is inserted into the document feeder 2 above the board A on the sheet 8, but in order to improve operability, the document 9 is inserted from the paper ejecting section 17 shown in FIG. You can. In this case, the document must be inserted from the rear end with the document surface facing down. Note that a paper detection sensor may be provided in the paper discharge section 17 similarly to the document feeder 2, and a cleaner device may be provided near the lower roller 7 to prevent the back surface of the document from being contaminated.

As explained above, the board copying apparatus includes the document feeding length detecting means, the document feeding direction forward/reverse determining means, and the L'2JA
By providing one stage of reversal for reversing the conveyance direction, the y1 document conveyance direction of the document conveyance device can be reversed depending on the length of document passing or the desired operation mode, thereby eliminating the need for a long document conveyance path and allowing continuous document conveyance. Copy 1 Double-sided copying can be done easily and in a short time, and the document path for alternating multiple small-sized documents can be shortened, so the document is less likely to be damaged and can be adjusted according to the document feeding length. Appropriate copied images can be obtained, and document jamming on the document feeding and conveying path can be easily handled. Furthermore, it has become possible to provide the document transport device only in the vicinity of the exposure scanning position, and therefore it has become possible to downsize the transport device.

(Effects of the Invention) As explained above, according to the present invention, a board sheet that moves on the screen by the rotation of the upper F roller, a document feeder having a paper feed roller, etc., and a document having a document transport roller, etc. A board copying apparatus comprising a document feeding and conveying device equipped with a conveying device, an optical system and a copying device for copying the original manuscript and image information stored on the eight-sided sheet of the board, the document feeding and conveying device comprising: By providing the device with a paper passing length detection means for detecting the paper passing length of the original, a forward/reverse judgment means for judging whether the original transport direction is forward or reverse, and a reversing means for reversing the original transport direction. , it is possible to easily perform continuous copying and double-sided copying in a short time without using a long document transport path, and to reduce damage to documents by shortening the document path when copying multiple sheets of small-sized documents. This has the effect of making it possible to obtain an appropriate copy image according to the paper length using the IR function, and making it easier to deal with document jams.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view of a board copying apparatus which is an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a flowchart showing each operation mode in this embodiment.
FIG. 4 is a layout diagram of the operating section of this embodiment. 1 ---- Single plate 2F copying device 2 ---- yl paper feeding device 4 ---- Original feeding and conveying device 5 ---- Upper roller 6 ------- Original conveying device 7 - --- Lower roller 8 - Meal sheet 9 --- Original 16 --- Copying device 2 e - Paper feed roller 2 g --- Conveyance roller

Claims (6)

[Claims] (1) A document feeder that includes a board sheet that moves across the screen by rotation of upper and lower rollers; A board copying device comprising an optical system for copying image information written on a board sheet and a copying device, the paper passing length detection means detecting the length of the document passing through the document feeding and conveying device. A board copying apparatus comprising: a forward/reverse determining means for determining whether the document conveying direction is normal or reverse; and a reversing means for reversing the document conveying direction. (2) The paper passing length detecting means detects the length of the paper by the count number of a timer counter in the controller while the leading edge and trailing edge of the document pass through the paper detection sensor. Blackboard copying device. (3) The reversing means has a paper passing length equal to the distance between the upper and lower rollers.
/2 or less, after the trailing edge of the document passes the exposure scanning position, the upper and lower rollers of the document feeder are reversed to return the document to the document feeder. Blackboard copying device. (4) A patent characterized in that the reversing means reverses the upper and lower rollers of the document feeder after copying and returns the document to the document feeder during continuous copying in which multiple copies are made from one document. A board copying apparatus according to claim 1. (5) The reversing means obtains a timer count number corresponding to the length of the document passing, and performs processing according to the length of the document passing, such as moving the lens in the optical axis direction or selecting the size of the copy paper. , reverse the lower roller of the document feeder, and
2. The board copying apparatus according to claim 1, wherein the original is returned to the paper feeder and re-fed to copy the original. (6) The reversing means reverses the upper and lower rollers of the document conveying device when the document is jammed in the document feeding and conveying path, and discharges the jammed document out of the device. The blackboard copying device described in Section 1.