JPH0318542A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the jam of a manually inserted paper by installing an anomaly detecting means for detecting the anomaly of the transport state of a sheet material onto a manually paper feeding means. CONSTITUTION:When a sheet material P is inserted manually, the sheet P is sent by the manually paper feeding means 23, 25, and 26, and transported onto a transport passage 7 in the direction perpendicular to the feeding direction, and an image is formed on the sheet material P. In this case, if a trouble is generated in the transport state of the sheet material P in the manually paper feeding means 23, 25 and 26, the trouble is detected by a sensor 23. On the basis of the detection signal, the sheet material P is discharged by the discharging means 23, 25 and 26.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus having a manual paper feeding device such as a copying machine, a printer, or a printing press.

2. Description of the Related Art A conventional electronic copying apparatus 50 has a manual paper feed tray 51 on the right side of the unit 150, as shown in FIG. The manual transfer material P fed manually from the tray 51 is conveyed by a paper feed roller pair 52 and a registration roller pair 53, passes through a transfer guide 55, and is conveyed to a photosensitive drum 56. In this case, the conveyance direction of the transfer material P is one direction from the right side to the left side of the device 50, and the movement of the transfer sheet P from the cassette 57 with respect to the photosensitive drum 56 is exactly the same.

However, the cassette (storage box for transfer material P) shown in Figure 6
As shown in FIG. 7, a front-loading type cassette 57, in which the cassette 57 is inserted and removed from the front, has begun to become popular, improving the operability of the cassette 57.

Furthermore, it has become possible to consider copying machines in which a manual paper feed port is disposed on the front, and it is expected that the installation and operability of copying machines will be improved.

(C) Problems to be Solved by the Invention However, in the above-mentioned manual paper feeding from the front, as shown in FIG. Then, the transfer paper P is conveyed in the direction of arrow B, which is perpendicular to the eight directions of arrows, in the apparatus 50, and an image is formed on the transfer paper P.
When manually feeding the transfer material P in the eight directions of the arrows, if there is no means to detect abnormalities in the feeding of the transfer material P, a jam may occur during conveyance in the direction of the arrow A. Furthermore, if the transfer material P is too long and is fed in eight directions, there may be a problem such as jamming when it is transported in the direction of arrow B.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an image forming apparatus that detects abnormality in the feeding of a manual transfer material and prevents jamming.

(2) Reviews to solve issues, the present invention is made in view of the above facts. 26), and the manual paper feeding means (
The sheet material (P
In the image forming apparatus (1) in which the conveyance path (3) of the sheet material (P) and the conveyance path (6.7) of the sheet material (P) for image formation are perpendicular to each other, the manual paper feeding means (23, 25 . 26) is characterized in that abnormality detection means (16 to 20, 31 to 33) for detecting abnormality in the conveyance state of the sheet material (P}) is provided.

Further, when detecting an abnormality in the sheet material (P) fed and conveyed from the abnormality detection means (16 to 20. 31 to 33) or the manual paper feeding means (23.26), the transfer material (
The present invention is characterized in that a discharge means (23, 25, 26) for discharging P) is provided.

(n) Based on the structure described above, when the operator manually inserts the manual sheet material (P) whenever necessary, the manual sheet feeding means (23,
25 and 26), after the sheet material (P) is manually fed, it is transported on the transport path (7) in a direction perpendicular to the manual feeding direction, and an image is formed on the sheet material (P). At this time, in the manual paper feeding means (23, 25, 26),
If an abnormality occurs in the conveyance state of the manually fed sheet material (P), the abnormality is detected.

Moreover, when an abnormality in the conveyance state is detected, the manually fed sheet material (P) is discharged by the discharge means (23, 25, 26).

Note that the symbols in the brackets above are for illustration purposes only, and do not limit the structure in any way.

(f) Example The embodiments of the present invention will be described above with reference to the drawings.

FIG. 1 is a plan view of the front manual paper feeder, FIG. 2 is an explanatory diagram of its operation, and FIG. 4 is a perspective view of an electronic copying apparatus embodying the present invention. The electronic copying apparatus 1 is provided with a manual feed opening 2, and is provided with a manual feed tray 3 that can be opened by protruding forward from the opening 2. Further, 5 is a cassette containing a transfer material P used for general image formation. Further, a conveyance path 6.7 for double-sided/multiple image formation is provided in the apparatus 1 at a slightly lower level than the upper surface of the manual tray 3 and perpendicular to the manual tray 3.

Then, in the horizontal position, a guide plate 9 that supplements the missing portions of the conveyance paths 6 and 7 is pivotally supported by a pin 10 fixed to the device 1 via a bracket 10a, and a predetermined position is placed above the guide plate 9. Guide plates 11 are integrally attached to the guide plate 9 in parallel at intervals, and the front end of the guide plate 11 is bent upward at a right angle to form a shutter lla.

Further, a plurality of conveyance drive rollers 12 are rotatably attached to the apparatus 1 horizontally to the apparatus 1 and orthogonal to the conveyance paths 6 and 7, and are connected to each other by a shaft 12a, and are driven by a motor 3 to drive the shaft 12a. is driven through the roller 1
The upper part of the guide plate 2 projects from the hole for the roller 12 in the guide plate 9 to the upper surface of the guide plate 9. A presser roller 15 is provided on the upper surface of the guide plate 11 to face the drive roller 12, protrudes from the hole for the roller 15 in the guide plate 11 to the lower surface of the guide plate 11, and comes into pressure contact with the drive roller 12. ing. When the guide plates 9 and 11 are tilted about the pin 10, the drive roller l2 is located below the upper surface of the guide plate 9, and the presser roller 15 is such that it can be seen slightly from the lower surface of the guide plate 11. In addition, the transfer material P is stopped by a hole for the presser roller provided in the guide plate 1l, and a gap is maintained between the lower end of the presser roller 15 and the upper surface of the guide plate 9 so that the transfer material P can move without hindrance. It is now possible to do so. (The method of retracting the presser roller 15 as described above is the simplest method, but there are other methods, such as a method of lifting the shaft 15a of the roller 15 with respect to the guide plate 11 using a solenoid, etc. There are various methods, such as a method of lifting the shaft 15a with the tip of a lever when lifting the intermediate part with the rising part of the guide plate 11.) Also, reflective foot sensors 16, 17. 18, 19.20 is a postcard from the reference conveyance line C, B5, B5-R, A4 (A3-R), A4-R
They are placed at corresponding distances from each other. Also, an arm 2 pivotally supported on a pin 21 fixed to the device.
2, a manual feed drive roller 23 is rotatably attached to a position on the back side of the reference conveyance line C, and is driven by a motor 25. A roller 26 is attached. Further, an eccentric cam 27 that rotates the arm 22 about a shaft 2l is rotatably supported by a shaft 29, and is rotationally driven by a drive source (not shown).

Further, 30 is a guide for guiding the right end of the manual transfer material P. Detection sensors 3 are installed on both sides of the tip of the manual feed tray 3.
A detection sensor 32 is provided in front of the manual feed rollers 23 and 26, and a reflective paper sensor 33 is provided on the upper guide 3a of the manual feed tray 3.

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

First, the operator inserts the manual transfer material P along the guide 30 and brings the tip of the transfer material P into contact with the shirt flap 11a (
Step S1). Almost simultaneously, when the transfer material P is detected by the sensor 31, the signal causes a motor (not shown) to move the eccentric cam 27 by 180 degrees.
The cam 27 rotates the arm 22 to the pin 2.
1 in the counterclockwise direction (in FIG. 2), the end 22a of the arm 22 engages the end 9a of the guide plate 9, and the guide plate 9.11 is placed on the top surface of the manual feed tray 3. At the same time, the conveyance rollers 12 and 15 are retracted and the guide plate 9
The transfer material P is made movable on the upper surface. At the same time, the manual paper feed rollers 23 and 26 are brought into pressure contact.

That is, the state shown in FIG. 2(a) changes to the state shown in FIG. 2(b) (step 82).

When the motor that drove the eccentric cam 29 stops, the stepping motor 25 starts in response to the signal, and the manual feed rollers 23 and 2B rotate to convey the transfer material P (step S3>. Next, the detection sensor 32 detects the rear end of the transfer material P, the stepping motor 25 then
A predetermined pulse is transmitted to cause the rear end of the transfer material P to reach the reference line C and stop. That is, the state shown in FIG. 2(d) is reached (step S4).

When the sensor 32 detects the rear end of the transfer material P, the signal causes the eccentric cam 27 to rotate 180 degrees, and the arm 22
is lowered, the guide plate 9.11 is lowered to the position shown in FIG. 2(a), the conveying rollers 12.15 are pressurized, and the pressure on the manual paper feed rollers 23, 26 is released. Then roller 1
The transfer material P is conveyed to the double-sided/multiple conveyance path 7 by steps 2 and 15, and an image forming operation is started (step SS). Furthermore, if there is a next manual feed, the operation is repeated from step S1.

The above is a normal conveyance state of the transfer material P.

In the above, the number of pulses of the stepping motor 25 is counted by the counter 42 from the time of starting, and the amount of conveyance of the transfer material P by the motor 25 is measured. Then, a comparison circuit 43 compares the transfer material P detected by the sensors 16 to 20 with a comparison circuit 43, and a determination circuit 44 determines whether or not the transfer material P is being conveyed normally. If the conveyance amount of the stepping motor 25 and the timing of the detection signals of the sensors 16 to 20 do not match,
The control unit 41 displays JAM on the display unit 45 and all operations stop. Even if the conveyance amount of the transfer material P by the stepping motor 25 reaches the maximum size (A3-R), if the rear end of the transfer material P is not detected by the sensor 32, the comparison circuit 43 compares the It is determined that the size is abnormal, and at that point, the stepping motor 25 is reversed (step S?).

The motor 25 rotates in reverse to send the transfer material P back.

At this time, the conveyance amount of the motor 25 and the detection timing of the sensor 33 (33a for small size paper, 33b for large size paper) match, and then the end (back end) of the transfer material P is detected.
When the sensor 31 detects (step S6), the motor 2
5 stops, and the pulling back of the transfer material P is completed (step S9). However, in this case, since the transfer material P of an abnormal size has been manually fed, an error message is displayed on the display section 45 (step SIo).

In addition, if the detection timing of the sensor 33 and the operating amount of the motor 25 do not match (if the leading edge of the transfer material P does not reach the sensor 33 even after rotating the motor 25 for a predetermined second), the transfer material is being pulled back. When it is determined that a jam has occurred, the motor 25 is immediately stopped, all operations are stopped, and an error message is displayed on the display unit 45 (not only is the size abnormal, but a jam has occurred during return). (Step S, O).

In the case of the above-mentioned jam display (step Sa) and error display (step Sl0), once the sham-raised transfer material P is removed, the entire apparatus returns to the state shown in FIG. 2(a). , repeat the operations from step S1.

Note that FIG. 2(C) shows a state in which the transfer material P is being inserted, and FIG. 2(e) is a side view showing a state in which a transfer material P larger than the maximum size is being sent back. be. Furthermore, the sensor 33a is located at a position where the trailing edge of the inserted small-sized paper always comes through and can pass through when returning the paper. The same applies to the large size sensor 33b. Next, another embodiment will be explained with reference to FIG. In the above example, postcards, B5, B5-R, A4 (A3
-R), A4 size paper, but in this embodiment, even if non-standard size paper is manually fed, an abnormal state of the paper is detected. The same reference numerals are given to members having the same structure or function as those of the previous embodiment, and the explanation thereof will be omitted.

A rail 35 is provided at the right end of the manual feed tray 3, facing the manual feed direction, and a rack 36 is slidably mounted on the rail 35. Then, the paper feed press roller 26
A pinion 37 having a pitch circle having the same diameter as the roller 26 is integrally attached to the shaft 26a at a position corresponding to the rack 36, and the pinion 37 is meshed with the rack 36. Further, a photo interrupter 39 is attached to the tip of the rack 36 so as to move together with the rack 36. Further, a sensor 40 for detecting the leading edge of the transfer material P is attached to the shutter lla.

Therefore, when the transfer material P is manually inserted into the manual feed tray 3 so as to come into contact with the shutter 11a, the sensor 40 is turned on and the photointerrupter 39 is turned off. The manual feed drive roller 23 is started in response to the ON signal of the sensor 40, and the presser roller 26 is also operated in conjunction with the transfer material P and the rack 3.
6 moves on the same base.

At this time, if an abnormality occurs in the movement of the transfer material P, the transfer material P shifts toward the front side of the rack 36. Then, the photointerceptor 39 is turned on.

When this signal is input to the control unit 41, it is determined that there is a jam, the stepping motor 25 stops, and rotates in reverse.
Therefore, the manual feed roller 23 and therefore 26 also stop,
Immediately begin reverse rotation. The subsequent operation is similar to the previous embodiment.

(G) Effects of the Invention As explained above, according to the present invention, the abnormality detection means (16 to 20. Since abnormalities in the conveyance status are detected, shaming during manual paper feeding can be prevented. In addition, if an abnormality occurs while conveying the manual sheet material (P), the manual sheet material (P) is removed by the ejecting means (23, 25.
6), JAMs can be prevented and the troublesome JAM removal work can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the front manual paper feeder, FIG. 2 is an explanatory diagram of its operation, FIG. 3 is a flowchart, FIG. 4 is a control block diagram, and FIG. 5 is an electronic copying apparatus embodying the present invention. 6 is a perspective view showing another embodiment, FIG. 7 is a longitudinal sectional front view of a conventional electronic copying device, FIG. 8 is a perspective external view thereof, and FIG. 9 is a front manual feed operation explanatory diagram. . ... Abnormality detection means (sensor) 23, 25, 26 ... Manual paper feeding means, ejection means (manual paper feeding drive roller, stepping motor, manual paper feeding press roller) P... Sheet material (transfer material )

Claims (1)

[Scope of Claims] 1. A manual paper feeding means for feeding and transporting sheet material as needed, and a transport path for the sheet material manually fed from the manual paper feeding means and a sheet material for image formation. An image forming apparatus in which the manual sheet feeding means is provided with an abnormality detection means for detecting an abnormality in the conveyance state of the sheet material. 2. The abnormality detection means feeds paper from the manual paper feeding means.
2. The image forming apparatus according to claim 1, further comprising a discharge means for discharging the sheet material when an abnormality in the sheet material being conveyed is detected.