JPH0470211B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording device that transfers and records a toner image on an image carrier onto a transfer paper, and more specifically relates to a detection device that detects a transfer paper failure. This invention relates to a recording device with improved means.

[Background of the invention]

As a recording device that transfers and records a toner image on an image carrier onto a transfer paper, the general structure and operation of an electrophotographic copying device will first be explained as an example. FIG. 1 shows a sectional view of the internal structure of an electrophotographic copying apparatus. A slit exposure optical system 3 that optically scans an original placed on an original platen 2 is located above a photosensitive drum 1, which is an image carrier that is rotationally driven in the direction of the arrow. Slit exposure optical system 3
is equipped with a first movable base 33 on which an exposure lamp 31 and a first mirror 32 are mounted, and the reflected light from the first mirror 32 is moved synchronously with the second movable base 33 at half the speed of the first movable base 33. The second and third mirrors 35 of the stand 34,
The light is reflected by 36 and enters a lens 37 .
This lens 37 forms an original image on the circumferential surface of the photosensitive drum 1 via a fourth mirror 38 .

The photosensitive drum 1 rotating in a clockwise direction is first uniformly charged by a charging electrode 11, and then a latent image is formed by a slit exposure optical system 3. The latent image on the photosensitive drum 1 is developed into a toner image when passing through a developing device 12.

A transfer electrode 13 and a separation electrode 14 are provided at the bottom of the photoreceptor drum 1, and the transfer paper fed from the right paper feeder 4 is transferred onto the previous photoreceptor drum 1 by a double roller 5. The toner image is transferred onto the transfer paper at the transfer electrode 13, separated at the separation electrode 14, and then transferred to the fixing device 6.
After being sent to and fixed, it is ejected from the device.

On the other hand, after the transfer, the photosensitive drum 1 to which a small amount of residual toner has adhered is cleaned by the cleaning device 15, and one copying process is completed.

In the electrophotographic copying apparatus described above, transfer paper of a desired size is selected and ejected from the cassettes 7a and 7b loaded in the apparatus, and is ejected from the ejection port 8 of the apparatus after undergoing transfer and fixing. but,
Transporting the transfer paper is a surprisingly difficult process technically.
While copying a large number of sheets, the transfer paper may deviate from the pre-set transport path and cause a transport failure (jam), and the transfer paper may not be separated from the photoreceptor drum 1 and may become wrapped around the photoreceptor drum 1, or the double roller 5 may Due to this, the transfer paper may not be fed and may be bent in front of it, resulting in an accordion shape, or the transfer paper may become wrapped around the fixing roller 61 of the fixing device 6. If copying is continued despite the occurrence of a jam, the photosensitive surface of the photosensitive drum 1 may be damaged or an accident may occur in which restoration is difficult. For this purpose, a plurality of detection means such as micro-switches and photoelectric detection elements are provided in the passage path of the transfer paper, and if the detection means is not energized (ON) by the transfer paper at a preset time, then the It is assumed that a jam has occurred in the paper path, and the conveyance of the apparatus is immediately stopped and the jammed paper is removed, and copying cannot be resumed until after the jammed paper is removed. When a jam occurs and the operation of the apparatus stops, the operator is required to remove the jammed paper, but it is convenient for jam disposal work if the location where the jam occurs is displayed.

For example, in FIG. 1, the first detection means S is located upstream of the transfer position 130 and immediately in front of the double roller 5.
1 and the second detection means S2 is provided at a position downstream of the transfer position 130 and immediately after the fixing roller 61. Conventionally, the first detection means S1 is activated (ON).
If the second detection means S2 is not activated (ON) after a certain period of time, regardless of the size of the transfer paper,
Immediately, conveyance of the transfer paper was stopped as a jam had occurred. However, when conveying a large-sized transfer paper whose size is such that the first detection means S1 and the second detection means S2 are simultaneously energized, the second detection means S1 is activated (ON) and then the second detection means S2 is Detection means S2
If the energization (ON) does not occur, stop immediately and the second
3 as shown in Figures (2-1), (2-2), and (2-3).
There are many cases, and it is difficult for the user or the control unit to determine which of these cases applies. In the figure, P indicates transfer paper. Here, Figure (2-1) shows a jam caused by the leading edge of the large-sized transfer paper being wrapped around the fixing roller 61, and Figure (2-2) shows a jam caused by the leading edge of the large-sized transfer paper being wrapped around the photoreceptor drum 1 and conveyed. Figure (2-3) shows a jam that occurs in the paper feed section when the large-sized transfer paper is not caught by the double roller 5.

On the other hand, when a small size transfer paper is conveyed in which both the detection means S1 and S2 are not activated (ON) at the same time, the situation is as shown in FIG. 3. Figure (3-1) shows a jam caused by the leading edge of the small size transfer paper being wrapped around the fixing roller 61, and Figure (3-2) shows a jam caused by the leading edge of the small size transfer paper being wrapped around the photoreceptor drum 1 or in the conveyance path. Figure (3-3) shows a jam that occurs in the paper feed section when the size transfer paper is not caught by the double roller 5.
It is. In this case, the first detection means S1 is
1) In (3-2), it is not energized (OFF),
In Figure (3-3), it is energized (ON), so the user or control unit cannot
It is possible to determine whether the jam occurs in the conveyance path as shown in -2) or the jam shown in Figure (3-3) occurs in the paper feed section.

When transporting the large size transfer paper shown in Figure 2,
Even if a jam occurs, if you do not stop it immediately but stop it after a certain period of time, it will continue as shown in Figure 4,
In Figures (4-1) and (4-2), the first detection means S
1, it is no longer energized (OFF), and the user or control unit is informed of the figures (4-1) (4-
It is possible to determine whether the jam is the jam shown in 2) or the jam shown in Figure (4-3) that occurred in the paper feed section.

[Purpose of the invention]

As is clear from the above specific examples, the present invention has the following features:
It is an object of the present invention to provide a recording device that can stop conveyance of transfer paper when a jam occurs and accurately recognize and display the location where the jam occurs.

[Structure of the invention]

The above purpose is to provide a recording device that transfers and records a toner image on an image carrier onto a transfer paper, in which a roller that conveys the transfer paper located upstream of a position where the transfer paper is transferred and a roller that conveys the transfer paper and the transfer paper are transferred. a fixing device located downstream of the position where the transfer paper is transported; a first detection device located upstream of the transport roller to detect transport of the transfer paper; and a second detection unit located downstream of the fixing device to detect transport of the transfer paper. and when a certain period of time has elapsed after the first detection means was energized by the transfer paper, when the transfer paper is of a paper size that can simultaneously energize the first and second detection means. , when the transfer paper is not energizing the second detection means, the conveyance roller is stopped after a predetermined time has elapsed, and the transfer paper is of a small size that cannot energize the first and second detection means at the same time. In this case, when the transfer paper does not energize the second detection means after a certain period of time has elapsed after the first detection means was energized by the transfer paper, the conveying roller is immediately stopped. A recording device comprising: a control means for controlling the paper jam; and a display means for displaying the location where a paper jam occurs when a paper jam is determined as a result of detection by the first and second detection means. This is achieved by

[Description of the invention]

Note that in the case of small-sized transfer paper for which the first and second detection means S1 and S2 cannot be energized (ON) at the same time, the conveyance of the transfer paper should be stopped after a predetermined period of time as in the case of large-sized transfer paper. For example, when wrapped around the fixing roller 61 shown in Figure (3-1) above, the small size transfer paper is completely wrapped around the fixing roller 61.
1, it is not easy to remove this jam paper. Therefore, when conveying such small-sized transfer paper, it is necessary to convey it immediately upon detecting a jam. Moreover, as shown in FIG. 3, in the case of small-sized transfer paper, the location where the jam occurs can be sufficiently determined even if the conveyance is stopped immediately upon detecting the jam.

〔Example〕

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 5 is a circuit diagram of one embodiment of the present invention, and FIG. 6 is a flowchart thereof. In FIG. 5, the detection information of the presence or absence of transfer paper by the first detection means S1 detected immediately before the double roller 5, the detection information of the presence or absence of transfer paper by the second detection means S2 detected immediately after the fixing roller 6, and the cassette size detection means A transfer paper size identification signal by SS is input to the CPU 91. In this embodiment, the cassette size detection means SS is long enough to simultaneously detect the detection means S1 and S2.
A3 and B4 size transfer paper can be used as large size transfer paper.
A4 and B5 size transfer paper that is long enough to simultaneously detect detection means S1 and S2 is considered a large size transfer paper, and the size of the transfer paper at the time of feeding is CPU9.
1 is input.

The CPU 91 follows the flowchart in Figure 6.
When a jam is detected after time-up, a transfer paper conveyance stop signal is immediately issued in the case of small-sized transfer paper, and a signal to stop transporting the transfer paper is issued for a predetermined time, for example, in the case of large-size transfer paper.
A signal to stop transporting the transfer paper is issued with a delay of about 1.5 seconds.

At the same time, the first detection means S1 is energized (ON) in the display device 92 (for example, provided on the operation unit) in FIG. 5, and the second detection means S
When 2 is not energized (OFF), there is jam paper in the paper feed section in front of double roller 5 (paper feed JAM).
is displayed, and when the first detection means S1 is not energized (OFF) and the second detection means S2 is also not energized (OFF), it is displayed that there is a jam paper in the conveyance section (conveyance JAM).

〔Effect of the invention〕

In this way, according to the present invention, the location where the jam occurs is displayed correctly regardless of the size of the transfer paper, so the recording device according to the present invention is easy for the user to handle, and it is possible to easily handle jams. The effect occurred.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the internal structure of an electrophotographic copying device, FIGS. 2 to 4 are explanatory views showing the jam state of transfer paper, and FIG. 5 is a circuit diagram of an embodiment of the present invention. FIG. 6 is a flow chart thereof. 1...Photosensitive drum, 5...Double roller, 6
... Fixing roller, 7 ... Cassette, 13 ... Transfer electrode, 14 ... Separation electrode, 91 ... CPU, 92
... Display device, S1 ... First detection means, S2 ...
Second detection means, SS...cassette size detection means.

Claims (1)

[Claims] 1. In a recording device that transfers and records a toner image on an image carrier onto transfer paper, a roller that conveys the transfer paper is located upstream of the position where the transfer paper is transferred, and a roller that transports the transfer paper is located upstream of the position where the transfer paper is transferred. a fixing device located downstream; a first detection device located upstream of the transport roller to detect transport of the transfer paper; and a second detection unit located downstream of the fixing device to detect transport of the transfer paper.
and when a certain period of time has elapsed after the first detection means was energized by the transfer paper, when the transfer paper is of a paper size that can simultaneously energize the first and second detection means. , when the transfer paper is not energizing the second detection means, the conveyance roller is stopped after a predetermined time has elapsed, and the transfer paper is of a small size that cannot energize the first and second detection means at the same time. In this case, when the transfer paper does not energize the second detection means after a certain period of time has elapsed after the first detection means was energized by the transfer paper, the conveying roller is immediately stopped. A recording device comprising: a control means for controlling the paper jam; and a display means for displaying the location where a paper jam occurs when a paper jam is determined as a result of detection by the first and second detection means. .