JPH02239048A - Controller for automatic document feeder - Google Patents

Abstract

PURPOSE:To simplify an operation relating to treatment of paper jam and to shorten a time required for that by automatically returning a document staying in a paper supplying unit to a paper supply port when the document is jammed in a conveying unit or in a paper discharge unit. CONSTITUTION:In case that a document is jammed in a paper discharge unit 4, it is detected by a paper jam detection sensor and also the rear end of the document is detected by a document detection sensor 12, resist rollers 11, 11, etc., are rotated reversely to convey the document in a direction reverse to the conveying direction. Then, the rear end of the document is detected by a document set sensor 7, a let-in roller 6 makes pressure contact with the document and is rotated reversely. Moreover, the top end of the document is detected by a sensor 7, the roller 6 is parted from the document, the document is returned to a document tray 1 and waits until paper jam is removed. In case that the document is jammed in a conveying unit 3, the document is detected by a document detection sensor 12 and a document set sensor 7, resist roller 11, 11, etc., are rotated reversely and the document is returned to the document tray 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for an automatic document feeder that automatically feeds a document to be supplied to a copying machine or the like. [Prior Art] An automatic document feeder includes, for example, a transport section that transports a document to a predetermined position where it is to be used for copying, a paper feed section that supplies the document one sheet at a time to the transport section, and a paper feed section that feeds the document one sheet at a time to the transport section. and a paper ejecting section that ejects the document from the predetermined position to the outside.

When the automatic document feeder described above is used in a copying machine, multiple set documents are taken into the device one by one by the paper feed section, starting from the lowest one, and sent out to the transport section at a predetermined timing. Ru. The document is conveyed to a predetermined position by a conveyance section, its image is scanned by a light source lamp and used for copying, and then discharged to the outside by a discharge section.

According to such an automatic document feeder, when copying a large number of documents, the time required for copying can be shortened by eliminating the trouble of exchanging documents.

By the way, in an automatic document feeder, when a document becomes jammed in the transport section and the stray paper section, in order to copy the document again, it is necessary to remove the document from the jammed location and set it again. Further, at this time, the next original stack may be on standby or in the middle of being sent out in the paper feed section, and in order to copy the jammed original, the original in the paper feed section must also be taken out. However, as described above, the document in the paper feed section is pressed by the rollers for conveyance, making it difficult to take out.

For this reason, the automatic document feeder is provided with a pressure release means for releasing the pressure of the roller in the paper feed section, making it easier to take out the document from the paper feed section.

[Problems to be Solved by the Invention] However, in the conventional automatic document feeder described above, although the original part of the paper feeding section can be easily removed using the pressure release means, this work must be done manually. , which was not only troublesome but also wasted time.

[Means to solve the problem]

In order to solve the problem mentioned above, a control device for an automatic document feeder according to the present invention includes a paper jam detection means for detecting a paper jam in a conveying section and a paper ejecting section, and a paper jam detecting means for detecting a paper jam in a conveying section and a paper discharging section, The paper feed section document detection means detects whether or not the document is in the paper feed section, and the paper jam detection means detects paper jams in the transport section and the ejecting section. When this is detected, the conveying direction of the strip feeding means included in the conveying section and paper feeding section is reversed, and the J-
The present invention is characterized in that it includes a document return means (II) for returning the document in the paper feed section to the document supply port.

[Function] According to the configuration described in L, when a document gets jammed in the conveying section or the sharpening section, the paper jam detection means detects the jam, and the document detection stage of the paper feed section detects the document in the paper feed section. It is detected whether it is present or not. When it is detected that there is a document in the paper feed section, the document return means controls the conveyance section and the conveyance means of the paper feed section and reverses the direction of the conveyance force to feed the document in the paper feed section to the original l1. Send it back to the eyes.

In this way, if a document jams in the transport section or ejection section, the document in the paper feed section is automatically returned to the document supply port, so there is no need to manually remove the document from the paper feed section, and the operation is easy. This simplifies the process and reduces the time required to clear paper jams.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

As shown in FIG. 3, the automatic document feeder is comprised of a source tray 1, a paper feed section 2, a conveyance section 3, and a paper discharge section 4. The original tray 1 and the paper feed section 2 are connected to the copying machine main body 5.
On the other hand, the conveying section 3 and the paper discharging section 4 are temporarily formed and arranged in an L portion of the copying machine main body 5 so as to be openable and closable.

The paper feed section 2 includes a pull-in roller 6 that draws a document set on the original f-height tray 1, which serves as a document supply port, into the paper feed section 2;
A document set sensor 7 is provided to detect whether or not a document is set. Approximately in the center of the paper feed section 2, there is a separation roller 8 that takes out only the lowest original among the set originals, a paper feed roller 9 that transports the original to the registration rollers 1l and 11, and a paper feed roller 9 that transports the original. A paper feed gate 10 is provided to limit the number of documents that can be read.

In addition, near the exit of the paper feed section 2, there are registration rollers I1 and 11 that feed the document to the transport section 3 at a predetermined timing, and a paper feed roller 9 and a registration roller I1 and rollers L1 and 11 depending on the presence or absence of the document. A document detection sensor 12 is provided to control the driving of the original document detection sensor 12.L is provided with a document detection sensor 12 for controlling the driving of the document feed roller 6, separation roller 8, feeding roller 9, and registration roller 11. is rotationally driven by a feed motor 35, which will be described later.

The origin detection sensor 12 and [manuscript writing sensor] sensor 7 are designed to detect a document and send a detection signal to the CPU 21, which will be described later, and are used as document detection means in the paper feed section of an automatic document feeder. It is functioning. Also, a drawing roller 6, a paper feed roller 9, and a registration roller 11/1
1 is a conveying means in the paper feeding section 2.

On the other hand, the conveying section 3 is provided at both ends with a bell 1 and a driving roller 13 which are driven and rotated by a conveying motor 36, which will be described later, and a rotatable belt driven roller 14. Between the belt drive roller 13 and the belt driven roller 14, a conveyor belt 15 for conveying the document is stretched, and belt tension rollers 16 for pressing the lower side of the conveyor belt 15 downward are provided at predetermined positions. They are arranged at intervals of . The belt drive roller 13 and the conveyance belt 15 serve as conveyance means in the conveyance section 3.

Further, the ejection section 4 is provided with a conveyance roller 17 and a turn roller l8, so that the conveyance direction of the original to be copied is reversed and the document is discharged onto the upper end surface of the conveyance section 3. A switching gate 19 is provided near the upper end of the turn roller 18 . The switching gate 19 closes downward to guide the original to the outside when copying one side of the original, and opens upward to guide the original to the conveying section 3 when copying both sides of the original.

Next, the main parts of the control device of the automatic document feeder will be explained based on FIG.

The CPU 20 that controls the copying machine main body 5 shown in FIG.
The CPU 2l is connected to the CPU 2l and communicates with the CPU 2l. In addition, the CPU 20 includes a CPU
2 Similarly to 1, the operation panel 2 is connected via the inverter 22.
3 are connected, and various data can be input manually from outside.

A ROM 2 4 is connected to the CPU 2 0 via a latch 25, and a RAM 2 6 is also connected to the CPU 2 0.

A control program is stored in the ROM 24, and this control program and R. Based on the setting data stored in the AM 26, various loads in the copying machine are controlled through the drive device 27.

Further, a reset circuit 28 for resetting the CPU 20 to its initial state is connected to the CPU 20, and a battery circuit 29 is connected to both the reset circuit 20 and the RAM 26. An l/030 is connected to the CPU 20, so that signals are relayed to and from other input units and control targets (not shown).

On the other hand, a ROM 3 1 is connected to the CPU 2 1 via a latch 32, and a paper jam detection sensor 33 serving as paper jam detection means is connected via a display section 34 that displays the state of paper jam. ing. Also, CPU
2 1 includes a feeding motor 35 which drives each roller of the sheet feeding section 2 shown in FIG. Rotation speed detectors 38 and 39 for detecting the rotation speeds of the feed motor 35 and the conveyance motor 36 are also connected to the feed motor 35 and the conveyance motor 36, respectively. Furthermore, the CPU
21 includes a document set sensor 7 and a document detection sensor 1.
2 is connected to receive the detection signal from the paper feed section 2.

Such a CPU 2 1 outputs an energization control signal PWM (
A signal PWM (hereinafter referred to as PWM) is output, and energization to the feeding motor 35 and the transport motor 36 is controlled by PWM. The CPU 21 also controls the paper jam detection sensor 3.
3... detects a paper jam, and when the document sensor 7 or the document detection sensor 12 detects that there is a document in the paper feed section 2, the paper feed is started according to the control program stored in the ROM31. Gion motor 35 and'
Rotation direction control signal TMI/TME (hereinafter referred to as signal TMI/T) controls the transport motor 36 so that the rotation direction is reversed.
The rotation direction of the paper feed motor 35 and the conveyance motor 36 is reversed by changing the level of the motor (referred to as ME).

Next, details of the drive device 37 will be explained based on FIG. 2.

The signal PWM is supplied from the CPU 2l in FIG. 1 as described above, and is connected to the inverter 40 and diode D1,
D2 and resistances R, -R. via buffer gate 4
It is connected to 1.42.

The buffer gates 41 and 42 are connected to a DC voltage 5■.

Also, the signal TMI-TME is similar to the signal PWM.
1 and connected to the input terminal of the driver 43 via an inverter 40, diodes D, .D, and resistors R, .R4, respectively, while a buffer gate 42
・It is input to 41. Signals output from the driver 43 and corresponding to the signals 'TM1 and TME are connected to resistors R and R, respectively.
- Connected to the bases of transistors Q and -Q2 via R. Also, the transistor Q.・Q. are each based on a resistor R. -R. DC voltage through 24■
At the same time, the eminter is connected to a DC voltage 24.

The output signal of the puffer gate 42 is output from a resistor R, which is connected in parallel between the resistor R and ground. and is connected to the base of transistor Q3 via capacitor CI. Also,
The output signal of the buffer gate 41 is connected to the base of the transistor Q4 via a resistor Rll and a capacitor C2 connected in parallel to ground. Transistor Q3
The collector of transistor Q. It is also connected to one end of the transport motor 36 via a capacitor C3 connected between the coil LNs and ground, and a coil. Further, the collector of the transistor Q4 is connected to the transistor Q. and the capacitor C connected between the coil L3 and ground.
4, further connected to the other end of the transport motor 36 via coils 1, , 3, and transistors Q3 and Q4.
The emitters are grounded through resistors RI2 and Rl1, respectively.

Such a driving device 37 operates when either the signal TMI or 'rME is at low level, the transistor Q.
- The transport motor 36 is rotated by turning on Q4 or transistors Q2 and Q3 to form a current conduction path to the transport motor 36. Further, the drive device 37 changes the levels of the signals TMI and TME to turn on transistors Q, -Q4 that are different from those used during rotation, and switches the energization path to the transport motor 36, thereby controlling the rotation direction of the transport motor 36. It is designed to be reversed. Furthermore, the drive device 37 controls the on/off of the buffer gates 41 and 42 using the signal PWM, and controls the on and off of the transistors Q3 and Q4, thereby controlling the transfer motor 36 according to the cycle of the signal PWM. It is designed to control energization. Note that the paper feed motor 35 is driven in substantially the same manner as the conveyance motor 36, so a description thereof will be omitted.

In the configuration described in J.1, when the copying operation starts, the original set in the paper feed section 2 is pressed by the pull-in roller 6, and the pull-in roller 6, separation roller 7, and paper feed roller 9 are pressed. Paper feed game 1-1 opens downward by rotating.
0 into the paper feed unit 2. The leading edge of the document is detected by the document detection sensor 12, and the registration roller 1
When the number reaches 1.11, the rotation of the intake roller 6, separation roller 8, and paper feed roller 9 is stopped, and the conveyance of the document is stopped.

The document that is in a standby state on the registration rollers 11, 1l is sent to the conveyance section 3 by the registration rollers 11, 11 rotating at a predetermined timing. The document is conveyed to a predetermined position by the conveyor belt 15 while being pressed by the belt tension rollers 16, and after its image is copied, it is sent to the wandering paper section 4 by the conveyor bell l-15. . The original is conveyed by the turn roller 18 and appears above the ejecting section 4, but when performing single-sided copying,
When the switching gate 19 closes downward, the paper is discharged to the outside, while when double-sided copying is performed, the switching gate 19 opens upward and the paper is sent to the conveying section 3.

Next, an explanation will be given of the operation when a document becomes jammed in the conveyance section 3 or the HL paper section 4 when the document is conveyed by the automatic document stacking device as described above.

As shown in FIG. 4(a), for example, when a document jams in the stray paper section 4, the document in the paper feed section 2 has already been sent to the transport section 3. At this time, the paper jam detection sensor 33 shown in FIG. rotates in the opposite direction, and the conveyor belt 15 moves in the opposite direction.

As a result, the document being transported by the transport section 3 is moved backward, and is further transported in a direction opposite to the normal transport direction by the paper feed roller 9 and separation roller 8, which rotate in the opposite direction.

Subsequently, as shown in FIG. 2(b), the document is conveyed through the paper feed gate lO that opens downward, and when the trailing edge of the document is detected by the document set sensor 7, the drawing roller 6 is moved to the above-mentioned position. It presses against the original and rotates in reverse. Furthermore, when the leading edge of the document is detected by the document detection sensor 12, the registration roller l
The rotations of 1 and 11 and the movement of the conveyor belt 15 are stopped.

Then, as shown in the same figure (C), the original is transported,
Further, when the leading edge of the document is detected by the document set sensor 7, the drawing roller 6 moves toward and away from the document, and the paper feed game 10 closes upward.

In this way, the original in the paper feed section 2 is returned to the original tray 1 where it was set, and waits there until the paper jam is removed and it can be copied.

In addition, if the original is jammed in the transport section 3, the original is stopped from being transported by the registration rollers 11 and 1l and has not yet been sent to the transport section 3, so the original is detected by the original detection sensor 12 and the original setting sensor 7. be done. As a result, the registration rollers 11 and 11 and the paper feed rollers 9
, the separation roller 8 and the intake roller 6 rotate in the reverse direction, and the original is returned to the original tray l.

Here, the processing procedure when a document becomes jammed in the automatic document feeder will be explained based on the flowchart shown in FIG.

First, with the copying machine main body 5 powered on and ready for copying, set the original on the original tray 1 (S1
). When copying is started in this state (S2), the document is taken into the paper feed section 2, and at a predetermined timing, the document is transferred to the transport section 3.
(33). After the document is conveyed to a predetermined position by the conveyance section 3 and used for copying, it is further conveyed by the discharge section 4 (S4). During this time, the paper jam detection sensor 33... detects whether or not the document is jammed (S5).

When it is detected in S5 that a document is jammed, the document detection sensor 12 and the document set sensor 7 detect whether or not there is a document in the paper feed section 2 to be conveyed to the conveyance section 3 (S6). When it is detected in S6 that there is a document in the paper feed section 2, the conveyor belt 15 moves in the opposite direction to reversely feed the document, and each roller of the paper feed section 2 rotates in the reverse direction (S7).
), this causes the document to be returned to document tray 1 (
S8). Then, it is determined whether the document jammed in the transport section 3 or the paper ejection section 4 has been removed (S9), and if the document is not removed, the document returned to the document tray 1 is maintained in a standby state. If it is determined in S9 that the jammed document has been removed, it is determined whether or not to restart copying (310).
The procedure from S2 onwards is repeated.

On the other hand, if no document jam is detected in S5,
The original is ejected to the outside (Sll), transferred to SIO, and it is determined whether to make the next copy. Further, in S6, if no document is detected in the paper feed section 2, the processes from S9 onwards are performed.

[Effects of the Invention] As described above, the control device for an automatic document feeder according to the present invention includes a paper jam detection means for detecting a paper jam in the transport section and the ejecting section, and a paper jam detection means for detecting paper jams in the transport section and the paper ejection section. A paper feed section document detection means detects whether or not there is a document in the paper feed section, a paper jam detection means detects a paper jam in the transport section and a stray paper section, and a paper feed section document detection means detects a document in the paper feed section. When the document is loaded, the document returning unit reverses the conveying direction of the conveying unit included in the conveying unit and the paper feeding unit, and returns the original in the paper feeding unit to the document supply port. The jam detection means detects that the document is jammed in the transport section or the ejection section, and
When the paper feed section document detection means detects whether or not the document to be transported to the transport section is present in the paper feed section, the document return means controls the transport section and the transport means of the paper feed section to reverse the transport direction. Then, the document in the paper feed section is returned to the document supply port.

In this way, if a document jams in the transport section or paper ejection section, the document in the paper feed section is automatically returned to "Document Supply 1", eliminating the need to manually remove the document from the paper feed section.゜ζ This has the effect of improving the efficiency of copying work.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, and FIG. 1 does not show the main parts of the control device of the automatic document feeder and the control part of the copying machine. 2 is a circuit diagram showing the frame movement device included in the control device of the automatic document feeder, FIG. 3 is a cross-sectional front view showing the configuration of the automatic document feeder, and FIG. An explanatory diagram showing the state in which the document is being sent from the paper feed unit to the transport unit, Figure (b) is an explanatory diagram showing the state in which the document is being retracted, and Figure (C) is an explanatory diagram showing the state in which the document is returned to the document tray. The explanatory diagram, FIG. 5, is a flowchart showing the processing procedure when a document becomes jammed. ■ is the document tray (document supply port), 2 is the paper feed section, 3 is the transport section, 4 is the paper discharge section, 6 is the pull-in roller (transport means), 7 is the document set sensor (document detection means in the paper feed section) , 9 is a paper feed roller (transporting means), 11 is a register 1 roller (transporting means)
, 12 is a document detection sensor (paper feeding unit document detection means), 13
is the belt drive port (conveyance means), l5 is the conveyor belt (
21 is CPLI (original return f stage) 233
Reference numeral 35 denotes a paper jam detection sensor (paper jam detection means), 35 denotes a paper feed motor (conveyance means), and 36 denotes a conveyance motor (general conveyance means).

Claims (1)

[Claims] 1. Paper jam detection means for detecting paper jams in the transport section and paper ejection section; Paper feed section document detection means for detecting whether or not the document to be transported to the transport section is in the paper feed section; and paper jam detection means When a paper jam is detected in the transport section and the paper ejection section, and a document in the paper feed section is detected by the paper feed section document detection means, the transport direction of the transport means of the transport section and the paper feed section is reversed. A control device for an automatic document feeder, comprising: a document return means for returning the document in the paper feed section to the document supply port.