JPS63143142A - Document carrying device - Google Patents

Abstract

PURPOSE:To prevent breaking of a document, by arranging a document detection means and a roller position detecting means at a document inserting section and disabling counter measure against jamming if a roller is separated from the document inserting section even if jamming is detected when power is thrown in. CONSTITUTION:An under roller 10 is arranged contactably/separatably into/from an upper roller 2 located at a document inserting section. A stopper 11 in the downstream of the rollers 2, 10 advance into a carrying path when said rollers separate and retract from the carrying path when said rollers 2, 10 contact. A photosensor PS1 for detecting a document is arranged between the stopper 11 and the rollers 2, 10, while a photosensor PS6 for detecting the positions of the roller 10 and the stopper 11 is arranged near the roller 10. If both rollers are contacted when power is thrown in, counter measure against paper jamming is carried out based on an output from the photosensor PS1, and if said rollers are separated counter measure against paper jamming is disabled regardless of the output from the photosensor 1. Consequently, a document remained immediately above a stopper member is protected from breaking.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an original document conveying device in which a document is conveyed along a fixed path and irradiated with light at a predetermined position in order to make a copy.

Conventional techniques and their problems 5. .

Conventionally, this type of document conveying device has been provided with a document insertion section equipped with the following mechanism.

That is, the document insertion section is provided with a drive roller for document conveyance and a driven roller that can move toward and away from the drive roller, and
A stopper member is provided in the conveyance path on the downstream side of each roller in the document conveyance direction, and at the time of reset, the driven roller is separated from the drive roller and the stopper member is moved into the conveyance path, so that the leading edge of the inserted document is The driven roller is brought into contact with the drive roller and the stopper member is retracted from the conveyance path during document conveyance. A document detection means is provided between both rollers and the stopper member, and the document detection signal from the document detection means is normally used to start conveying the document, and in combination with a timer, control is performed to clear the paper jam. ing.

However, in terms of usability,
When the power is turned on, the document detecting means does not check for paper jams. Therefore, if the document is stopped directly above the stopper means due to a problem such as a paper jam, the operator can turn the power on without accidentally removing the document. When the driven roller and the stopper member are turned on, the driven roller and the stopper member are reset, and there is a risk that the stopper member may enter the conveyance path and damage the remaining document.

Therefore, the document conveying device according to the present invention includes upper and lower rollers, a stopper member, and document detecting means provided in the document insertion section, and the lower roller and the stopper member are separately provided. detecting means for detecting the position of the original document detecting means; and when the position detecting means detects that the lower roller is in contact with the upper roller when the power is turned on, paper jam handling is performed based on the detection signal of the document detecting means. and control means for prohibiting the paper jam processing based on the detection signal of the document detection means when the position detection means detects that the lower roller is separated from the upper roller. It is characterized by

With the above configuration, problems such as paper jams may occur.
When the xi is turned on again after the power source is turned off, if the lower roller is in contact with the upper roller (at this time, the stopper member is retracted from the conveyance path), the document detection means checks for paper jams. Therefore, if a document exists in this state, it can be determined that there is a paper jam, and a warning is given to the operator, and since the stopper member cannot be reset completely, there is no risk of damaging the document. Even if the original is removed, since the lower roller is in contact with the upper roller, insertion of the original is prohibited, and no new paper jams will occur.

On the other hand, if a problem such as a paper jam occurs and the power is turned off and then turned on again, if the lower roller is separated from the upper roller (at this time, the stopper member has entered the conveyance path). ), prohibits the document detection means from checking for paper jams. In this case, both the lower roller and the stopper means have been reset, and the document is not located directly above the stopper member.Therefore, there is no need to check for paper jams in the document insertion section. The leading edge of the document is regulated by the stopper member, and even if the document detecting means is in the detection state, it will not be detected as a paper jam. Therefore, if the temperature adjustment within the copying machine main body is adjusted in this state, it is possible to immediately start conveying the document and move on to the print copying operation.

Embodiment Hereinafter, one embodiment of a document conveying device according to the present invention will be described with reference to the accompanying drawings.

In this embodiment, as shown in Fig. 1, the inserted original is circulated along a fixed path according to the number of copies. (
It consists of 2) to 7), a transport motor (M) for driving these, and a document ejection tray (8), and is built into the upper part of the main body of the copying machine.

A rotatable document conveyance roller (10) is installed below the document conveyance roller (2) so as to allow a liquid path, and a stopper (11) is installed integrally with this conveyance roller (10). The conveyance roller (10) and the stopper (11) are driven by a solenoid (SLI), and normally the conveyance roller (10) is driven by the conveyance roller (2) as shown by the dotted line in FIG.
), and the stopper (11) enters into the document conveyance path shown by the dashed line (A). On the other hand, the solenoid (
When SLI) is turned on, the conveyance roller (10) comes into contact with the conveyance roller (2), the stopper (11) is retracted from the document conveyance path, and the document is ready to be conveyed.

Further, a photosensor (PS6) is installed near the conveyance roller <10) and the stopper (11>) to detect the operating positions of these.This sensor (PS6) is, for example, When the stopper (11) is separated from the conveyance roller (2) [at this time, the stopper (11) has entered the conveyance path], the stopper (11) is turned off, and when the conveyance roller (10) is in contact with the conveyance roller (2) ( At this time, the stopper (11) is turned on (in a retracted state from the conveyance path).

Each of the conveyance rollers (3) to (7) is a guide plate (3a) to
(7a), and the conveyance rollers (4) and (5) are switching claws (15) and (16) for switching the circulation conveyance path.
), the conveyance roller (3) is equipped with a switching claw (17) for switching between circulation and discharge, and each switching claw (15),
(16), <17) is the solenoid (SL2), (
At SL3) and (SL4), it is possible to advance and retreat into the document conveyance path shown by the dashed line (A) (see FIG. 3).

That is, the document can be circularly conveyed along each of the conveyance rollers (3) to (7) while being guided by each guide plate (3a) to (7a), and the switching claw (17) is moved into the conveyance path. When the switching claw (15) is able to fully enter in this state, the original is completely circulated between the transport rollers (3>, (4), and the switching claw (15) is fully inserted.
16), the paper is circulated between the transport rollers (3) and (5), and when the switching claws (15) and (16) are retracted, the paper is circularly transported between the transport rollers (3) and (6). Furthermore, when the switching claw (17) is retracted from the transport path, the original is transferred from the transport roller rough 7> to the output tray (8).
) is discharged on top.

On the other hand, a photo sensor (
Psi) to (PS5) have been installed. Sensor (Ps
i) is installed just before the stopper (11) to detect the insertion of the original and detect the length of the original in combination with a timer; the sensor (PS2) is for detecting the reference position of the original; The sensor (PS3) is a reference sensor for starting a timer that detects the document length. In addition, the sensor (PS4> is for determining the timing for operating the switching claw (17), and the sensor (PS5)
) is for detecting the ejection of the original.

Furthermore, each of these sensors (Psi) to (PS5) is also used to detect paper jams in the original.

That is, when the leading edge of the original is detected by each sensor, a paper jam detection timer is started, which is set to the time it takes for the leading edge of the original to reach the next sensor, and when the timer times up, the leading edge of the original is detected by the next sensor. If the paper is not detected by the sensor, it is determined that there is a paper jam. In addition, the sensor (
Psi) does not function for paper jam detection in a specific state where the power is turned on, and this point will be explained in detail below.

Next, the general structure of the copying machine main body will be explained.

The photosensitive drum 20) can be driven to rotate in the direction of arrow (a), and well-known image forming elements such as a charger and a developing device (not shown) are arranged around the photosensitive drum 20). The optical system (21) includes an exposure lamp (22) and a mirror (23).
, (24), (25), a lens (26), and a mirror (27>), and the transport roller (3), (4
) Light is applied to the document being conveyed on the glass (19) installed between the photoreceptor drums (20), and the photoreceptor drum (20) is exposed to the reflected light through a slit.

Two types of copy paper (30) and (31) are supplied in roll form, and one of them is selectively fed to a cutter (32) driven by a solenoid (SL5) and a pair of timing rollers (33). ) to the transfer section (20a). The copy paper onto which the image has been transferred in the transfer section (20a) is conveyed as shown by the dashed line (B) in FIG. 35) It can be discharged upward. Further, a copy paper detection sensor (PS7) is installed immediately before the timing roller pair (33).

Kirani, this copying machine has a main switch (SW).
is installed. When this main switch <S$/) is turned on, power is supplied to the main body of the copying machine and the original conveyance device, and the copying machine is put into an operable state.

Figure 4 shows the control circuit, and the operation of the copying machine main body and automatic document circulation conveyance device is controlled mainly by a microcomputer (CPU), and its input terminal is connected to a main switch (S
w〉, each -t=n''j (Psi) to (PS6) are connected, and the output terminal is connected to a conveyance motor (M) and a solenoid (SLI) to (SL4).

Here, the operation of the automatic document circulation conveyance device having the above configuration will be schematically explained together with the operation of the main body of the copying machine.

The main body of the copying machine starts a copying operation when the sensor (Psi) detects that the original has been fully inserted from the guide plate (1).

That is, when the document is fully inserted along the guide plate (1) and the leading edge is detected by the sensor (Psi), the solenoid (SLI) is turned on and the conveyance roller (10> is conveyed.
The stopper (11) is brought into pressure contact with the roller (2), and the stopper (11) is retracted from the conveyance path. When the original is fully conveyed in the direction of the arrow and its leading edge is detected by the sensor (PS2), one of the preselected rolls is moved. Copy sheets (30) and (31) having shapes are fed, and when the leading edge of the sheets is detected by a sensor (PS7), the feeding of the sheets is temporarily stopped.

While the document is being transported, it is placed on the glass (19) with a lamp (
22), the original image is formed as an electrostatic latent image on the outer peripheral surface of the photoreceptor drum (20) via a lens (26), etc., and is converted into a toner image by a developing device (not shown).

When a predetermined period of time has elapsed after the leading edge of the document was detected by the sensor (PS3), the timing roller pair (33) is driven, and the copy paper is transferred to the transfer section (20a) in synchronization with the toner image.
), and the cutter (32) operates at a timing corresponding to the length of the document to cut the copy paper.

Next, Figure 6 shows the operation of the automatic document circulation conveyance device.
This will be explained with reference to the flowcharts of FIGS. 7 and 8.

FIG. 6 shows the main routine of the microcomputer (CPU).

(When the CPU> is reset and the program starts, the random access memory (
Clears RAM), initializes various registers, and performs initial settings to put each device in its initial mode. Next, in step <Sl), a subroutine for checking paper jams when the power is turned on, which will be explained below, is called, and in step (S3), subroutines for controlling other processes are called.In step (S3), copy operations and Although it executes control such as conveyance of the original, the explanation thereof will be omitted.

Furthermore, in step (S4), it is determined whether or not the routine timer has expired, and after waiting for this timer to expire, the process returns to step (Sl). The routine timer determines the time required for the main routine, and its value is set at the initial setting of step (Sl), and also serves as a reference for the timer that can be used in each subroutine.

FIG. 7 shows a subroutine for checking a paper jam upon power-on, which is executed in step (Sl) of the main routine.

First, in step (510), it is determined whether the main switch (SW) is on-edge. If it is not on-edge, this subroutine ends immediately. Main switch (S
If W) is on-edge, it is determined in step (511) whether the sensor (PS6) is on.

If the sensor (PS6'') is not on, that is, if the conveyance roller (10) is in a state of separation from the conveyance roller (2) and the stopper (11) is in a state of entering the conveyance path, the process returns to the main routine. On the other hand, if the sensor (PS6) is on, that is, the conveyance roller (10) is
), and if the stopper (11) is in a retracted state from the conveyance path, it is detected in step (512) whether or not the sensor (Psi) is on. This sensor (P
si) detects whether there is a document in the document insertion section, and if there is no document and the state is off, the process returns to the main routine.
If there is a document and it is turned on, paper jam processing is executed in step (513). That is, the occurrence of a paper jam is displayed on the operation panel to warn you, and the operation of the apparatus is stopped.

Note that this paper jam processing itself is well known, and its details will be omitted.

FIG. 8 is a modification of the step (Sl), in which the state of the flag (Fl) is determined instead of determining whether the sensor (PS6) is on or off in the step (511). . Flag (Fl) is sensor (Psi)
is set to rl when it is on, and reset to 0 when it is off. In this case, even if the power is turned off, the flag (
In order to store the state of Fl) in memory, a non-volatile memory (50) may be connected to or built into (CPU).

Specifically, in step <520) the main switch (S
It is determined whether W) is on-edge, and if it is not on-edge, this subroutine is immediately terminated. If it is on-edge, it is determined whether the flag (Fl) is "1" or not in step (521). “If it is 0., that is, the insertion roller (10
) is separated from the transport roller (2), the process returns to the main routine, and if it is "1", that is, the insertion roller (10
) is in contact with the conveyance roller (2), step (5)
22), it is determined whether the sensor (Psi) is on. Then, similarly to step (512), the sensor (Ps
If i) is off, the process returns to the main routine, and if it is on, paper jam processing is executed in step (523).

On the other hand, the length of the original is detected by a combination of sensors (Psi), (PS3), etc. and a timer, and the length of the original is detected by a combination of sensors (Psi), (PS3), etc.
The document is circulated between (5) and (3) to (6) for the number of copies, and is finally discharged from the conveyance roller (7) to the document discharge tray (8). This type of conveyance is performed by a solenoid (SL2).

(SL3) and (SL4) are controlled to turn on and off, but the details thereof will be omitted.

As described above, in this embodiment, after a trouble such as a paper jam occurs and the power is turned off, when the power is turned on again [YES in steps (510) and (520),
Determine whether the sensor (PS6) is on or off or the state of the flag (Fl) based thereon [step (511).

(521)], as shown in Fig. 5a, the transport roller (1
0> is in contact with the transport roller (2), and the stopper (
11) is in the retracted state from the conveyance path [step (5)
11), YES at (521), sensor (Psi) is turned on.

Determine OFF, and if ON, that is, there is a document (D) [YES in steps (512), (522), perform paper jam processing [steps (513), (523)],
As a result, the operator is warned of a paper jam in the document insertion section, the stopper (11) is not reset, and damage to the document is prevented. In addition, the manuscript (
Even if D) is removed, the conveyance roller (10) is still in contact with the conveyance roller (2), so insertion of the document is prohibited and no new paper jam occurs.

On the other hand, as shown in FIG. 5b, if the conveyance roller (10) is in a state of separation from the conveyance roller (2) and the stopper (11) is in a state of entering the conveyance path [step (511);
At (521), paper jam processing is not executed regardless of whether the sensor (Psi) is on or off.

That is, when the conveyance roller (10) and the stopper (11>) are in the reset state, the document is not located directly above the stopper (11), and there is no need to check for paper jams using the sensor (Psi). Therefore, even if the leading edge of the document (D) is regulated by the stopper (11) and cannot be detected by the sensor (Psi), it will not be detected as a paper jam. Once the temperature adjustment of the fixing device (34) and the like are completed, it is possible to immediately start conveying the document (D) and move on to the copying operation, which is convenient to use.

In the above-mentioned embodiment, a conveyance device that automatically conveys the document in a circular manner is shown, but the present invention is of course not limited to this type of conveyance.

Effects of the Invention As is clear from the above explanation, according to the present invention, 1. When the power is turned on, if the lower roller provided in the document insertion section is in contact with the upper roller, the upper roller, the lower roller, and the stopper member If the lower roller is separated from the upper roller, paper jam removal is performed based on the detection signal of the document detection means. 1! is prohibited when the document is stopped directly above the stopper member due to a problem such as a paper jam. Even if the source is turned on, it will be determined that there is a paper jam and the stopper member will not enter the conveyance path.
There is no risk of damaging the W remaining directly above the stopper member.

[Brief explanation of the drawing]

The drawings show an embodiment of the document conveying device according to the present invention, in which FIG. 1 is a schematic diagram of the structure installed in a copying machine, FIG. 2 is an explanatory diagram of the document insertion section, and FIG. 3 is an illustration of the switching claw portion. Explanatory diagram,
Figure 4 is a block diagram of the control circuit, Figures 5a and 5b are explanatory diagrams of the operation of the insertion roller and stopper, Figures 6 and 7,
FIG. 8 is a flowchart showing the processing procedure. (2)...Conveyance (upper) roller, (10)...Conveyance (
Lower) Roller, (11)... Stopper, (Psi)...
・Photo sensor for document detection, (PS6)...Photo sensor for position detection, (SLI)...Solenoid, (A
)...Document transport path, (SW)...Main switch.

Claims (1)

[Scope of Claims] 1. An upper roller for document conveyance provided in the document insertion section, a lower roller provided so as to be able to approach and separate from the upper roller, and a conveyance path downstream of each of the rollers in the document conveyance direction. A stopper member at the leading edge of the document is provided to be movable back and forth, and when the lower roller is separated from the upper roller, the stopper member enters the conveyance path, and when the lower roller is in contact with the upper roller, the stopper member is moved. a driving means for retracting from the conveyance path; a means for detecting the position of the lower roller and the stopper member; a document detecting means provided between both the rollers and the stopper member; and when the power is turned on, the lower roller moves to the upper roller. When the position detection means detects that the lower roller is in contact with the upper roller, paper jam processing is executed based on the detection signal of the document detection means, while the position detection means that the lower roller is separated from the upper roller. 1. A document conveying device comprising: control means for prohibiting execution of paper jam processing based on a detection signal from the document detection means when a paper jam is detected by the document detection means.