JPH01231740A - Image forming device - Google Patents

Abstract

PURPOSE:To eliminate troublesome work when manual paper feed fails by providing a control means which is reset to wait condition when a manual paper feed, detecting means does not detect a recording member for longer than a first time. CONSTITUTION:A manual paper feed section 5 is extended near to aligning rollers 59, 60 where a manual paper feed detection switch 74 for detecting a paper to be inserted is arranged. When a paper is inserted through a manual guide 6 to the manual paper feed section 5 under wait condition, the switch 74 is turned ON by the inserted paper. Upon depression of a print area 82 of an operating section 4 under this condition, a print key is turned ON to start copy operation. If the manual paper feed detection switch 74 is turned OFF for longer than a predetermined time between an interval from start of copy operation to start of rotation of the aligning rollers 59, 60 in manual paper feed copy operation, it is judged that erroneous paper feed is made then copy, operation is interrupted and the machine is reset to a capable waiting condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus such as a copying machine that enables a copying operation (hereinafter referred to as a copying operation) by manually feeding paper.

[Technical Background of the Invention and its Problems] Conventionally, some copying machines of this type perform the following control.

(a) A manual paper feed detection switch and a manual paper feed roller are installed in the manual paper feed section. When paper is fed and the manual paper feed detection switch is turned on, the paper feed roller is rotated and the paper is delivered directly in front of the photoconductor drum. At the same time, the aligning roller is rotated to feed the paper to the transfer unit on the photosensitive drum side and start copying.

(b) When paper is fed into the manual paper feed section, the paper is manually delivered to the aligning roller, and when a manual paper feed detection switch near the aligning roller is turned on at this time, the state becomes ready for copying.

By the way, when the latter control is adopted, there are advantages in that the number of parts is small and the structure is simple and inexpensive. However, in this case, the paper may not reach the aligning rollers reliably because reaching the aligning rollers depends on manual operation. For example, even if the manual paper feed detection switch is turned on, If the operator pulls out the paper or if the paper falls from the manual paper feeder, the paper will not be fed to the transfer unit.
This has the disadvantage that the same treatment as when a paper jam occurs is taken. In other words, when a paper jam occurs, various safety measures are taken in addition to interrupting the copying operation, but it is extremely troublesome to clear the jam, and it is difficult to avoid such situations from occurring frequently. This will result in a significant decrease in reliability.

Furthermore, when paper is fed from the manual paper feed section, it is necessary to accurately detect paper jams that occur in the manual paper feed section.

[Object of the Invention] The present invention has been made based on the above circumstances, and its purpose is to eliminate the need for troublesome work when manual paper feeding fails, to improve reliability, and to improve reliability. An object of the present invention is to provide an image forming apparatus that reliably detects paper jams in manual paper feed.

[Summary of the Invention] The image forming apparatus of the present invention includes an image forming section that forms an image on a recording material, a manual paper feeding section that supplies the recording material to the image forming section, and a manual paper feeding section that is inserted into the manual paper feeding section. a manual paper feed detection means for detecting a recording material; and after the manual paper feed detection means detects the recording material, the recording material is supplied to the image forming section based on a copy start instruction, and in this state, the manual paper feed is performed. control means for returning to a standby state when the paper detecting means does not detect a recording material for a first time period or longer, and displaying an abnormality when the manual paper feeding detecting means detects a recording material for a second time period or more; It is equipped with the following.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, ``■'' is the main body of the copying machine, and a document table 2 is provided on the upper surface of the main body 1 so as to be able to reciprocate in the direction of the arrow shown in the figure. A document table cover 3 is connected to the document table 2 so as to be openable and closable. Furthermore, an operating section 4 is provided at the top of the main body 1. Furthermore, a manual paper feed section 5, a manual paper feed guide 8, a paper feed cassette insertion section 7, and the like are provided on the side surface of the main body l.

2 and 3 are views mainly showing the document table moving mechanism as viewed from the rear side of the main body l. In Figures 2 and 3,
A binder 11 is attached to the side of the document table 2. This binder 11 has a pin 12 that is vertically slidable, and this pin 12 is connected to a chino 13. The chino 13 is hooked up to sprockets 14 and 15 provided on both sides of the main body l.

On the other hand, a motor (not shown) is provided in the lower part of the main body l, and the power of the motor is transmitted to the sprocket 16. Sprockets 17.1g and 19.20 are arranged around the sprocket 16, and a chain 21 is connected to these sprockets.A gear 22 is coaxially connected to the sprocket 18, and the gear 22 is connected coaxially to the sprocket 18.
3.24.25 are meshed sequentially. The gear 25 has a first
A gear 28 is connected via the spring clutch 2B and the second spring clutch 27, respectively, and this gear 28 has a gear 29 coaxially connected to the sprocket 15.
are interlocked.

Here, the first spring clutch 26 has a pair of sprockets for power transmission, and is turned on when the nearby solenoid 30 is energized and the claw of the plunger 30a is engaged. A pair of sprockets are connected by winding, and thereby gear 25
The power is transmitted to the gear 28. However, the pair of sprockets in the first spring clutch 2B have a relatively small number of teeth, so that low-speed power is transmitted to the gear 28 when the first spring clutch 26 is turned on.

The second spring clutch 27 also has a pair of sprockets for power transmission, and the solenoid 31 in the vicinity
is turned on when the plunger 3ta is energized and the claw of the plunger 3ta is engaged, and the pair of sprockets are connected by an internal spring winding, thereby transmitting the power of the gear 25 to the gear 28. However, the pair of sprockets in the second spring clutch 27 have a relatively large number of teeth, so that high-speed power is transmitted to the gear 28 when the second spring clutch 27 is turned on.

Therefore, when the above motor operates, sprocket 1
6 rotates in the direction of the arrow shown in the figure, and the power is transmitted to the gear 22 by the chino 2]. If the gear 22 rotates and the first spring clutch 26 or the second spring clutch 27 is on at this time, low-speed or high-speed power is transmitted to the sprocket 15, and the sprocket 15 moves in the direction of the arrow shown in the figure. Rotate to. sprocket 15
When this rotates, the chino 13 rotates, and the engagement between the pin 12 and the binder 11 causes the document table 2 to reciprocate in the direction of the arrow shown in the figure.

Thus, three metal shielding plates 32, 32, and 32 are attached to predetermined locations on the chino 13. Further, a home switch 33 is provided near the sprocket 15. That is, when the document table 2 is at the home position, the shielding plates 32, 32, 32 are located in the gap between the home switch 33. The home switch 33 has a concave shape as shown in FIG. A magnetic field is applied to the reed switch 33b to turn on the contact of the reed switch 33b, but if there is a shielding plate 32.32°32 between the two poles (gap), the shielding plate 32 will cause the reed switch 33b to be turned on. By bypassing the magnetic field, the contacts of the reed switch 33b are turned off.

In this case, three shielding plates 32 are used, and the home switch 33 is mounted near the sprocket 15, where the vibration of the chino 13 is small, so that the home switch 33 can operate reliably. .

On the other hand, magnets 34 and 35 are respectively disposed on substantially both sides of the document table 2 in its reciprocating direction. Furthermore, main body 1
A reed switch 36 is located near the sprocket 15 in
will be placed. This reed switch 36 is similar to the home switch 33b, and has a magnet 34 or 35.
It is designed to turn on when it approaches.

Here, the moving state of the document table 2 is shown in FIG. 5(a).

Shown in (b), (c), (d), and (e). That is, the position where the shielding plate 32 corresponds to the home switch 33 as shown in FIG. 5(a) is called the home position, and the document table 2 is moved from the home position to the state (start position) shown in FIG. 5(b). Once it moves back, the document table 2 moves forward as shown in FIGS. 5(c) and 5(d). Then, the document table 2 is moved back from the state shown in FIG. 5(d) (limit position) to the home position as shown in FIG. 5(e).

FIG. 6 shows the copying mechanism in the main body 1 as viewed from the front side of the main body (2). That is, 40 is an image forming unit such as a photosensitive drum, 41 is an exposure lamp, 42 is a reflecting mirror, and 4
3 is an optical lens, 44 is a reflecting mirror, and the light emitted from the exposure lamp 41 is reflected by the document platen 2, and the photosensitive drum 40
By irradiating the light upwardly, an electrostatic latent image corresponding to the image of the document on the document table 2 is formed on the photoreceptor drum 40.

45 is a developing device, which includes a toner hopper 46, a toner supply roller 47, a toner stirring roller 48, 48, and a developing roller 49.
, a toner-free detector 50, etc., and a developing roller 49.
By applying toner to the surface of the photoreceptor drum 40, the electrostatic latent image on the photoreceptor drum 40 is visualized. The toner hopper 46 is provided with a lid 51 that can be opened and closed. Further, a magnet 52 is attached to the tip of the lid body 51, and a reed switch 53 is attached to the toner hopper 46 side.
When the lid body 51 is opened or closed, a reed switch 53 is turned on.

On the other hand, a paper feed cassette 54 is set in the paper feed cassette insertion section 7, and a take-out roller 5 for taking out paper, which is a recording material, from the paper feed cassette 54.
5. A paper out detection switch 56 attached to this roller 55 is provided. However, the paper feed cassette 54
The paper taken out is fed via a paper feed guide 58 to aligning rollers 59 and 60, which serve as registration means. The paper feed guide 58 has a light emitter 61 and a light receiver 6.
2 are provided facing each other, and the presence or absence of paper can be detected based on the light receiving state of the photoreceptor 62. The aligning rollers 59 and 60 feed the fed paper to the transfer section corresponding to the photosensitive drum 40.

Furthermore, 63 is a transfer charger that transfers the image onto a sheet of paper supplied from aligning rollers 59 and 60 on the photosensitive drum 40. A peeling charger 64 peels the paper from the photosensitive drum 40. 85.6
Reference numeral 6 denotes a conveyance roller, B7 denotes a conveyance belt, and 68.degree. 69 denotes a heat roller serving as a thermal fixing device, which fixes the transferred image on the sheet conveyed by the conveyance belt 67 by heat. Reference numerals 70 and 71 designate a paper ejection roller, 72 a paper ejection detection switch for detecting a paper to be ejected, and 73 a paper ejection tray.

In addition, the manual paper feed section 5 is equipped with aligning rollers 59° and 60°.
A manual paper feed detector, such as a manual paper feed detection switch 74, for detecting the inserted paper is disposed there. Further, a cleaning device 75 is provided on the circumference of the photoreceptor drum 40 . This cleaning device 75 is for collecting toner remaining on the surface of the photosensitive drum 40, and the main part thereof is shown in FIG. That is, the toner to be collected moves the vibrator 77 to the left in the figure by the rotation of the auger 76 and is stored in the toner pack 78 . When the toner pack 78 is full, the auger 76 is displaced to the right in the figure, and the actuator 7
9 is pressed, thereby turning on the toner full switch 80.

FIGS. 8 and 9 specifically show the operating section 4. FIG. 81 is a decorative sheet, and on this sheet 81 there are a print area 82, a clear area 83, and a numeric keypad area 84.
A pattern such as the following is formed, and a copy number display 85, a light emitting diode 86 for displaying "Please wait",
Light-emitting diode 87 for displaying "copy available", light-emitting diode 88 for displaying "paper replenishment", light-emitting diode 89 for displaying "toner replenishment", light-emitting diode 90 for displaying "jam"
, a light emitting diode 91 for displaying "toner pack replacement", a copy density setting knob 92, and the like are provided. Further, a stop key 200 is provided on the left side of the operation unit 4 in the drawing.

A sheet-like switch assembly consisting of a flexible printing board 93 on which a conductive pattern is printed and a spacer 94 is glued below the sheet 81. On the flexible printing board 93, a grid-like conductive pattern is drawn on the top and bottom with a spacer 94 in between at a position corresponding to the pattern on the sheet 81, and the conductive pattern located above the spacer 94 functions as a switch. It is designed to work.

The spacer 94 has windows 9 corresponding to the pattern of the sheet 81.
5 is formed, and this window 95 is appropriately provided with a bridge portion 95a to prevent the sheet from bouncing. In this case, the lattice pattern of the flexible printing board 93 and the windows 95 of the spacer 94 are such that the portion corresponding to the print area 82 is larger than the portion corresponding to the clear area 83, and the portion corresponding to the clear area 83 is larger than the numeric keypad area 84. is configured to be larger than the portion corresponding to each element.

On the other hand, the conductive pattern of the flexible printing plate 93 located below the spacer 94 acts as a cable, and the tip 93a of the cable portion is connected to the base material 93 of the operating section 4.
It is connected to a collector (not shown) of an internal control circuit board through a slit 97 formed in the slit 97 . Base material 96
A copy number display 85 is fixed thereto, and a buzzer 98 is also provided. The buzzer 98 operates and makes a sound when various operations on the operation unit 4 are in effect, and also operates and makes a sound when the power is turned on and the "Please wait" display light emitting diode 86 goes out. It is designed to emit.

FIG. 10 shows the main part of the control circuit. 100 is a microcomputer that performs various controls, and this microcomputer 100 includes the home switch 33, reed switch 36, reed switch 53, paper out detection device 5B,
Paper discharge detection switch 72, manual paper feed detection switch 74,
A toner full switch 80 and the like are connected. Further, a control circuit 4a of the operating section 4 is connected to the microcomputer 100. In this control circuit 4a, 82
83a is a clear key that responds to depression of the clear area 83, and 84a is a numeric keypad that responds to depression of the numeric keypad area 84.

The microcomputer 100 also includes a drive circuit 10.
1, the solenoid 30, solenoid 31, other spring clutches 102, a relay 103 for performing various operations, a high voltage transformer 104, etc. are connected. In addition, 105 is a segment driver, 10
5 is an oscillator for clock generation.

Next, the operation in the above configuration will be explained. When the power is turned on, the "Please wait" display light emitting diode 86 in the operation unit 4 flashes.

Furthermore, the heater lamp 138a inside the heat roller 68 lights up, and the aligning roller 59.80, conveyance roller 65.6B, heat rollers 6g, 69, and 01 paper roller 70.71 rotate, respectively, and the Forced paper ejection is performed. Then, when the heat roller 68 reaches a fixing temperature and the forced paper ejection is completed, the "Please wait" display light emitting diode 86 is turned off, and the printer enters a standby state in which copying is possible.

First, regarding the case where two copies are made,
This will be explained with reference to the time chart shown in the figure. In the standby state where a copying operation is not yet performed, the document table 2 is at the home position (FIG. 5(a)), the shielding plate 32 is present in the gap between the home switches 33, and the home switches 33 are turned off. maintain the condition. Now, when a copying start operation is performed on the operation unit 4, that is, the print area 82 is suppressed, the print key 82a is turned on. At this time, if the paper feed cassette 54 is set and there is paper in the cassette 54, the light emitting diode 87 for displaying "copy possible" in the operation section 4 lights up. When the print key 82a is turned on, the solenoid 30 is turned on by a command from the microcomputer 100, and the first spring clutch 26 is turned on. When the first spring clutch 26 is turned on, low-speed power is transmitted to the subblock 15, causing the chino 13 to rotate at a low speed.

In this way, the document table 2 once moves back from the home position in the direction shown in the figure and reaches the start position (FIG. 5(b)). At this time, since the document table 2 has moved, the shielding plate 32 is separated from the home switch 33, and the home switch 33 is turned on. When the home switch 33 is turned on, the exposure lamp 41
lights up and the photosensitive drum 40 rotates to prepare for exposure, and the take-out roller 55 operates to take out the paper from the paper feed cassette 54, and aligning rollers 59 and 60 of the taken out paper. comes into contact with.

On the other hand, the document table 2 continues to move, and after passing the start position, it now moves forward in the right direction in the figure, and with this forward movement, the light of the exposure lamp 41 is sequentially irradiated onto the documents on the document table 2. . The reflected light from the original passes through a reflecting mirror 42, an optical lens 43, and a reflecting mirror 44, and is irradiated onto the photosensitive drum 40. In other words, an electrostatic latent image corresponding to the image on the document is formed on the photoreceptor drum 40.

This electrostatic latent image is developed (toner is attached) by a developing device 45 and becomes a visible image.

When the magnet 35 of the document table 2 corresponds to the reed switch 36 (FIG. 5(C)), the reed switch 36 is turned off. When the reed switch 36 is turned off, the aligning rollers 59 and 60 rotate, and the paper that has already been taken out is supplied between the photosensitive drum 4o and the transfer charger 63, that is, to the transfer section.

In this way, the paper is supplied to the transfer section in synchronization with the rotation of the photoreceptor drum 4o, so that the visible image on the photoreceptor drum 40 is transferred onto the paper, and the paper is transferred to the photoreceptor drum by the peeling charger 64. 4o is peeled off. The peeled paper is conveyed by a conveyor belt 67 and supplied to heat rollers 88 and 69, where it is subjected to a fixing process and then discharged to a paper discharge tray 73 by paper discharge rollers 70 and 71.

Furthermore, when the document table 2 continues to move forward and reaches the limit position (FIG. 5(d)), the magnet 34 corresponds to the reed switch 36, and the reed switch 36 is turned on. When the reed switch 36 is turned on, the solenoid 31 is turned on, and the second spring clutch 27 is turned on. However, in this case, solenoid 3o still remains on,
As a result, the first spring clutch 26 continues to be in the on state. That is, this takes into consideration the fact that high-speed power is not immediately transmitted to the sprocket 15 even when the second spring clutch 27 is turned on, and the delay time, that is, the time for the second spring clutch to complete the spring winding. The first spring clutch 26 is kept in the on state for only a few seconds to transmit low-speed power to the sprocket 15, thereby preventing the document table 2 from running idle.

However, when the spring winding completion time (recorded in advance in the microcomputer 100) has elapsed,
The solenoid 30 is turned off and the first spring clutch 2
6 is off. At this time, the second spring clutch 2
7 ensures that high-speed power is transmitted to the sprocket 15. In this way, the document table 2 moves back to the left in the figure after passing the limit position, and then moves back further after passing through the state shown in FIG. 5(e). When the document table 2 reaches the home position (FIG. 5(e)), the shielding plate 32 closes the home switch 3 again.
3, the home switch 33 is turned off. Then, after a while, solenoid 3
1 is turned off, and the second spring clutch 27 is turned off. As a result, the document table 2 smoothly moves past the home position and stops at the start position (FIG. 5(b)).

By the way, the home switch 33 is activated by the return movement of the document table 2.
When it is turned off, paper is fed and the exposure lamp 41 is turned on for copying the second sheet. and,
After some time passes while the document table 2 remains stopped at the start position, the solenoid 30 is turned on, the first spring clutch 26 is turned on, and the document table 2 starts forward movement at a low speed. In this way, the second copy is performed in the same manner as described above. In this case, when copying the second sheet, the document table 2 is stopped at the start position for a while for the following reason.

That is, supplying the paper and lighting the exposure lamp 41 are as follows.
Whether it is the first copy or the second copy, the copy is made based on the state when the home switch 33 is turned off, but the movement from the home position to the start position is slow for the first copy. The second image is made at a high speed, and the above-mentioned control is performed to correct the time difference required for the movement. When the copying of the second sheet is completed and the document table 2 moves back and reaches the home position, the document table 2 stops there and the series of copied operations ends.

Incidentally, when the document table 2 is not at the home position at the start of the copying operation, the following control is performed. That is, since the home switch 33 is on, the solenoid 31 is first turned on, the second spring clutch 27 is turned on, and the document table 2 moves at high speed. Then, the manuscript table 2
No matter what position it is in, it will eventually return to the home position and the home switch 33 will turn on. In this way, after the document table 2 has been returned to its home position in advance, the same copying operation as described above is performed.

Next, the case of manual paper feeding will be explained. In a standby state, paper is inserted from the manual feed guide 6 into the manual paper feed section 5. Then, the manual paper feed detection switch 74 is turned on by the inserted paper. When the print area 82 of the operation unit 4 is pressed in this state, the print key 82a is turned on. At this time, since the manual paper feed detection switch 74 is on, the light emitting diode 87 for displaying "copy possible" in the operation section 4 lights up.

When the print key 82a is turned on, an operation similar to the above-described copying operation using cassette paper feeding is performed. However, this manual paper feeding copying operation only copies one sheet, and does not copy two sheets.

Furthermore, the differences between the copying operation using manual paper feeding and the copying operation using cassette feeding are as follows.

(a) For cassette paper feeding, aligning roller 59,
60 rotates unconditionally for a certain period of time, whereas in manual paper feed, after the aligning rollers 59 and 60 rotate, when the manual paper feed detection switch 74 is turned off, that is, when the manual paper is fed to the transfer section. Immediately, the rotation of the aligning rollers 59 and 60 is stopped, and the receiver is ready for the next manual feed.

(b) When feeding from a cassette, the display content of the copy number display 85 is decremented by one copy for each copy, whereas when feeding by hand, the display content of the copy number display 85 remains unchanged. Hold.

(C) When feeding paper from a cassette, the document table 2 moves when the print key 82a is turned on, and the document table 2 moves as shown in FIG.
) and the reed switch 36 is turned on, the aligning roller 59. G.

The paper is fed to the transfer unit by rotating the paper feeder, but in manual paper feeding, the original platen 2 is rotated from when the print key 1i2a is turned on as shown in Fig. 5 (C
) and the reed switch 36 is turned on (the aligning rollers 59 and 60 rotate), if the manual paper feed detection switch 74 continues to be off for a certain period of time, the paper in the manual feed will be removed from the manual feed guide. It is determined that the paper has fallen from the position 6, that is, a paper feeding error has occurred, and the copying operation is immediately interrupted to return to the standby state.

Further, there is the following relationship between the copying operation using cassette paper feeding and the copying operation using manual paper feeding.

(a) During copying operation using cassette feeding, aligning roller 59. When the manual paper feed detection switch 74 is turned on while the GO is rotating, it is determined that there is a paper jam.

(b) When the manual paper feed detection switch 74 is turned on while the aligning rollers 59 and 60 are not rotating during a copy operation using paper cassette feeding, the same process as when the stop key 200 is turned on is performed, and the Copying (multiple copying) is interrupted. At this time, the copy number display 85 continues to display the number of copies.

(C) Conditions in paragraph (b) above or stop key 20
After multi-copying is interrupted by turning on 0, copying operations using manual paper feeding are possible. At this time, the display contents of the copy number display 85 do not change.

(d) After the copying operation using manual paper feeding is completed under the conditions of item (c) above, when the print area 82 is pressed and the print key 82a is turned on, the copying operation for the remaining number of copies is performed using the cassette paper feeding, Thereafter, the number of copies set at the start of multi-copying is displayed again on the copy number display 85.

Here, the operation at the time of abnormality will be explained.

(a) If the paper in the paper cassette 54 runs out,
When the paper feed cassette 54 is pulled out, the paper out detection switch 56 is turned on, and the light emitting diode 88 for displaying "paper replenishment" in the operation section 4 blinks. In this state, when the paper feed cassette 54 containing paper is inserted into the cassette-insertion section 7, the paper out detection switch 5C is turned off and the light emitting diode 88 for displaying "paper replenishment" is turned off. In this case, in order to prevent the display from becoming unstable due to loading and unloading of the paper feed cassette 54, the light is turned off only when the paper out detection switch 56 is turned off for 0.5 seconds or more.

(b) When the toner empty detector 50 detects that the amount of toner in the toner hopper 46 has decreased, the "toner replenishment" display light emitting diode 89 blinks. This light emitting diode 89 is turned off when the lid 51 is once opened and then closed again. That is, the opening and closing of the lid 51 is detected by the magnet 52 and the reed switch 53. When the lid 51 is opened, the reed switch 53 is turned off, and a flag indicating that the lid is open is set in the microcomputer 100. Ru. For safety purposes, when the lid is opened, the light emitting diode 87 for displaying "copy possible" is turned off in the standby state, and the solenoid 30 is forcibly turned off to prevent the document table 2 from making a high-speed return movement during copying. maintained.

(c) When a paper jam occurs in the main body j or an abnormality occurs in the moving mechanism of the document table 2, the "paper jam" display light emitting diode 90 blinks.

Here, the types of paper jams inside the main body 1 are shown below.

(1) When the paper is not ejected from the main body 1 and the paper ejection detection switch 72 and the manual paper feed detection switch 74 remain on even after the forced paper ejection is completed when the power is turned on.

(2) When the manual paper feed detection switch 74 is turned on while the aligning rollers 59 and 60 are rotating during a copy operation using cassette paper feeding.

(3) When a very long sheet of paper is inserted from the manual feed guide 6 during a copy operation using manual paper feed, and the manual paper feed detection switch 74 continues to be in the ON state for more than a specified time.

(4) Aligning roller 5 in the state shown in Fig. 5(C).
9. When the discharge detection switch 72 is not turned on after a certain period of time after l1iO starts rotating.

(5) In the state shown in Fig. 5(C), aligning roller 5
When the paper ejection detection switch 72 is in the on state after a certain period of time after the rotation of the paper sheets 9 and 60, and the on state continues even when the paper is checked again.

Further, when the blinking of the light emitting diode 90 for indicating a "paper jam" is caused by an abnormality in the moving mechanism of the document table 2, the following describes the types of abnormalities.

(1) The document table 2 starts moving from the hole position (FIG. 5(a)), and even after a certain period of time has passed, the document table 2 remains in the 5th hole position.
When the state shown in Figure (c) is not reached and the reed switch 36 is not turned on.

(2) When the document table 2 does not reach the limit position (FIG. 5(d)) even after a certain period of time has elapsed from the state shown in FIG. 5(c), and the reed switch 3B does not turn on.

(3) After the reed switch 36 is turned on (by the magnet 35) with the document table 2 in the state shown in FIG. 5(C), the reed switch 36 is next turned on in the state shown in FIG. ), but the home switch 33 is turned off within a certain period of time.

That is, if the document table 2 is moving forward at a low speed, the home switch 33 will not turn on, but if, for example, a failure occurs in disengaging (off) the second spring clutch and the document table 2 is moving forward. If the original platen 2 moves at high speed while still moving at a high speed, the document table 2 passes through the states shown in FIGS. 5(d) and (e) and reaches the home position (FIG. 5(a)) during the above-mentioned certain period of time.
This turns off the home switch 33.

(4) After the reed switch 36 is turned on with the document table 2 in the state shown in FIG. 5(d), the home switch 3 is turned on within a certain period of time.
When 3 does not turn off. That is, the document table 2 is arranged as shown in FIG.
), the document table 2 switches to high-speed movement and moves backward, but the document table 2 does not return to the home position even after a certain period of time based on the high-speed movement has passed.

(5) If the print key 22a is turned on when the document table 2 does not return to the home position, the document table 2 is moved at high speed.
When the return to the home position is once performed, but the home switch 33 does not turn off even after a certain period of time has elapsed.

(d) When the collected toner in the toner pack 7B becomes full, the auger 6 is displaced and the toner full switch 80 is activated.
When turned on, the "toner pack replacement" display light emitting diode 91 blinks and the copying operation is interrupted.

By the way, among these abnormalities, paper jams and toner fullness are serious abnormalities for copying machines, so
When the light-emitting diode 90 for indicating "paper jam" and the light-emitting diode 91 for indicating "toner pack replacement" blink,
The blinking cannot be canceled unless the power is turned off and the memory of the microcomputer lOO is cleared.

The display color is red, which means danger.

On the other hand, the "Please wait" display light emitting diode 86, "
The abnormality caused by blinking of the light-emitting diode 88 for displaying "paper replenishment" and the light-emitting diode 89 for displaying "toner replenishment" indicates that it is minor or that preparation is in progress, and it is possible to cancel it without cutting off the power supply.

Furthermore, the display color of each light emitting diode is yellow, which means a warning.

Further, since the light emitting diode 87 for indicating "Copy allowed" is displayed in a normal state, the display color is green.

Therefore, in a copying operation using manual paper feeding, after the copying operation start operation is performed, the aligning roller 5
9. If the manual paper feed detection switch 74 continues to be off for a certain period of time until the rotation of 80, it is determined that a paper feed error has occurred and the copying operation is interrupted, and the paper returns to the standby state where copying is possible. Since it is possible to prevent jamming from occurring, it is no longer necessary to carry out troublesome work each time manual paper feeding fails, and reliability can be improved.

In addition, when switching the document table 2 from low-speed forward movement to high-speed backward movement, the second spring clutch 27 for high speed is first turned on, and then, after the time for completing the spring winding of the spring clutch has elapsed, the low speed Since the first spring clutch for r= is turned off, it is possible to prevent the document table 2 from running idly without putting a load on the spring clutch when changing the moving speed, thereby extending the life of the clutch. , it is possible to prevent malfunctions due to disturbances, etc.

Further, the home position of the document table 2 is detected by a shielding plate 32 attached to the chino 13 and a home switch 33 attached to the main body 1, and magnets 34 and 35 attached to the sketch side of the document table 2 in the moving direction. Since the start position and limit position of the document table 2 are detected by the reed switch 36 attached to the main body 1, it is possible to accurately detect the movement position of the document table 2 and distinguish between forward movement and double movement. , so optimal control is possible.

In addition, in the operation section 4, the use of mechanical switch parts and panel switches, which are said to be used, are well distributed depending on the application, making it possible to reduce the number of parts and simplify the configuration accordingly. Furthermore, design constraints can be reduced, and malfunctions due to chattering do not occur. Further, it is convenient for a panel switch because the -q effective area can be freely designed depending on the application.

In the above embodiment, a combination of a magnet and a reed switch was used to detect the moving position of the document table 2, but a combination of a magnet and a Hall IC or a microswitch using a photocoupler as an actuator may also be used. It can be implemented in the same way even if it is done in this way, and furthermore, the mounting position can be changed as appropriate depending on the situation. In addition, this invention is not limited to the "-2 embodiments,"
Various modifications can be made without changing the gist, and include, for example, facsimiles, printers, etc.

[Effects of the Invention] As detailed above, according to the present invention, there is no need to perform troublesome work when manual paper feeding fails, and it is possible to reliably detect paper jams in manual paper feeding and improve reliability. It is possible to provide an image and forming apparatus that can

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Fig. 1 is a perspective view of the external appearance, Fig. 2 is a configuration diagram mainly showing the document table moving mechanism as seen from the back side of the main body, and Fig. 3 is the same as Fig. 2. FIGS. 4(a) and 4(b) are block diagrams specifically showing the shielding plate and the home switch, and FIGS. 5(a), (b), (c), (
d) and (e) are diagrams each schematically showing the moving state of the document table, Figure 6 is a schematic configuration diagram of the part that actually performs the copying operation as seen from the back side of the main body, and Figure 7 is a diagram showing the state of movement of the document table. FIG. 8 is a detailed configuration diagram of the operating section; FIG. 9 is an expanded configuration diagram of the inside of FIG. 8; FIG. 10 is a configuration diagram of the main parts of the control circuit; FIG. 11 is a time chart for explaining the operation. 1...Main body, 2...Document stand, 5...Manual paper feed section,
40... Photosensitive drum, 41... Exposure lamp, 45
...Developing device, 54...Paper feed cassette, 55...
Take-out roller, 59.60... aligning roller,
74...Manual paper feed detection switch, 100...Microcomputer. Figure 1

Claims (1)

[Scope of Claims] An image forming section that forms an image on a recording material, a manual paper feeding section that supplies the recording material to the image forming section, and a manual feed section that detects the recording material inserted into the manual paper feeding section. a paper feed detection means; after the manual paper feed detection means detects a recording material, the recording material is supplied to the image forming section based on a copy start instruction; in this state, the manual paper feed detection means supplies a recording material to the image forming section; The present invention is characterized by comprising a control means that returns to a standby state when no recording material is detected for a second time period or more, and displays an abnormality when the manual paper feed detection means detects a recording material for a second time period or more. image forming device.