JPH04280732A - Copying device - Google Patents

Abstract

PURPOSE:To prevent various troubles due to the erroneous detection of the transfer paper size in a copying device. CONSTITUTION:Multiple paper feed bases, a resist sensor 4 detecting the transfer paper size in a conveyance passage, a paper discharge sensor 5, and a display section displaying the size of the stored transfer paper and the paper feed base are provided, the size of the transfer paper loaded in each paper feed base is detected, and the detection result is displayed on the display section.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a paper feed tray (paper feed cassette,
The present invention relates to a copying apparatus provided with a plurality of paper feed trays, and particularly relates to a copying apparatus characterized by transfer paper size detection control.

0002

[Prior Art] A detection plate is provided in the paper feed cassette, and a photo interrupter or a read switch is configured between the detection plate and the sensor provided at the paper feed port of the main body of the copying machine to which the paper feed cassette is installed. Copying devices that detect the size of transfer paper are well known. In addition, a position regulating member is provided in the paper feed tray so as to be movable (in the transfer paper width direction and transport direction).
A copying machine that detects the size of a transfer sheet from the position of a position regulating member that is moved in accordance with the transfer sheet stored in a paper feed tray is also well known.

0003

However, in the former type of copying device, if a detection plate that does not match the size of the transfer paper stored in the paper feed cassette is installed by mistake, the actual size of the transfer paper stored in the paper feed cassette may be There was a problem that the paper size could not be detected. Similarly, in the latter copying apparatus, if the position regulating member is set at a position different from the predetermined position, the size of the transfer paper will be incorrectly detected. In other words, for both the former and the latter, if the machine detects A3 even though B4 transfer paper is set, the transfer paper size display on the operation panel will display A3, so the user will be required to select A3 size transfer paper. If an A3 copy is made at a magnification of 100% with paper set, the B4 transfer paper will be ejected and the desired copy will not be obtained.

[0004] The present invention has been made based on this background, and includes a transfer paper size detection means provided in the transfer paper conveyance path to prevent erroneous detection of the transfer paper size by the transfer paper size detection means. An object of the present invention is to provide a copying apparatus that can prevent various troubles from occurring.

[0005]

[Means for Solving the Problems] The above object is provided with a plurality of paper feed trays, a transfer paper detection means for detecting the transfer paper size, and a display means for displaying the transfer paper size on the paper feed tray. In the copying apparatus, the first apparatus includes a control means for displaying the transfer paper size on the display means based on a detection result of the transfer paper size detection means that detects the size of the transfer paper loaded on each paper feed table in the conveyance path. This is accomplished by the following means. In the first means, the control means sequentially feeds paper from each paper feed tray after turning on the main switch, and the transfer paper size detection means detects the number of transfer sheets stored in each paper feed tray. This is achieved by a second means of detecting paper size. The above object also includes a paper feed tray provided with a position regulating member for regulating the position of the transfer paper, and a first paper feed tray that detects the size of the transfer paper stored in the paper feed tray from the regulation position of the position regulation member. a transfer paper size detection means, a display means for displaying the transfer paper size detected by the first transfer paper size detection means and a paper feed table in which the transfer paper is stored, and a display means for storing the transfer paper to be fed. a second transfer paper size detection means for detecting the transfer paper size within the conveyance path, and the control means selects the transfer paper size displayed on the display means. The paper size is compared with the transfer paper size detected by the second transfer paper size detection means, and if they do not match, the display means disables selection of the paper feed tray displayed on the display means. This is achieved by the third means of displaying a warning. Furthermore, the above-mentioned object includes a paper feed tray having a position regulating member for regulating the position of the transfer paper, and a first paper feed tray that detects the size of the transfer paper stored in the paper feed tray from the regulating position of the position regulating member. a transfer paper size detection means, a display means for displaying the transfer paper size detected by the first transfer paper size detection means and a paper feed table in which the transfer paper is stored, and a display means for storing the transfer paper to be fed. a second transfer paper size detection means for detecting the transfer paper size in the conveyance path, and when duplex and composite copy modes are selected, the control means The transfer paper size displayed on the display means is compared with the transfer paper size detected by the second transfer paper size detection means, and if they do not match, the paper is ejected without refeeding. This is achieved by a fourth means for causing the display means to display a warning.

[0006]

[Operation] In the first and second means, the control means, for example, after turning on the main switch, sequentially feeds paper from each paper feed tray, and detects the transfer paper size by a transfer paper size detection means provided on the conveyance path. The detection result is displayed on the display means. In the third means, the transfer size displayed on the display means based on the detection result of the first transfer paper size detection means provided on the paper feed tray and the transfer paper size of the second transfer paper size detection means provided on the conveyance path. If the detection results do not match, the control means disables selection of the paper feed tray and causes the display means to display a warning display. In the fourth means, when double-sided and composite copy modes are selected, the transfer size displayed on the display means based on the detection result of the first transfer paper size detection means provided on the paper feed tray and the second transfer paper size provided on the conveyance path. If the transfer paper size detection results of the paper size detection means do not match, the paper is ejected without performing a refeeding operation, and a warning display is displayed on the display means.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 is a control block diagram according to an embodiment, and 1 is a control block diagram of an embodiment.
The PU is a PU that exchanges data between the operation unit 2 and various I/O ports 3, and also inputs data from the registration sensor 4, paper ejection sensor 5, and size detection switch group 6. The CPU 1 also has a main motor 8, a cooling fan motor 9, an exposure lamp 10,
AC loads such as a fixing heater 11 are connected, and are activated when the main switch 12 is turned on.

FIG. 2 is a block diagram of a copying apparatus, in which 20 is 4
Paper feed trays arranged in stages, 21 are registration rollers, 2
2 is a photosensitive drum. Around this photosensitive drum 22, in the order of the image forming process, there is a charger 23 and an exposure section 2.
4, a developing unit 25, a transfer separation charger 26, and a cleaning unit 27 are arranged. 28 is a conveyor belt that conveys the separated transfer paper; 29 is a fixing unit;
30 is a double-sided composite conveyance path. The registration sensor 4 is provided on the front side of the registration roller 21, while the paper discharge sensor 5 is provided on the downstream side of the fixing unit 29.

FIG. 3 is a configuration diagram of the operation display section, in which 40 is a print key, 41 is a numeric keypad, 42 is a clear key, and 4
3 is a paper feed tray selection key, and 44 is an image density adjustment key. Further, 45 is a copy number display section, 46 is a paper end display section, 47 is a toner end display section, 48 is a paper jam display section, and 49 is a transfer paper size display section arranged in four stages. Each time the paper feed tray selection key 43 is pressed, the display stage of the transfer paper size display section 49 changes, and the transfer paper size of the selected paper feed tray 20 is displayed.

Next, the control operation of the first embodiment will be explained based on the flowchart shown in FIG. In this embodiment, the size of the transfer paper in the paper feed tray 20 is detected only by the registration sensor 4 and the paper discharge sensor 5. Specifically, after turning on the main switch 12 provided on the main body of the copying machine (S1), feeding transfer paper from each paper feed tray 20, and turning on the registration sensor 4 until the discharge sensor 5 turns on. The transfer paper size is detected (S2) by measuring the required time, that is, the time for the transfer paper to pass between both sensors. The above-mentioned time required for each transfer paper size is calculated in advance from the RAM in the CPU 1.
stored as data. Here, the required time t is t1
If so (Y in S3), it is determined that the size is A3, and this fact is displayed on the transfer paper size display section 49 (S4). Also,
When t is t2 (Y in S5), B4 size display is performed (S6). Similarly, when t is t3 (Y in S7
), A4 vertical (A4 size paper is stored in the paper feed tray 20 so as to be conveyed vertically; the same applies hereafter) is displayed (S8), and when t is t4 (Y in S9), A4
When t is t5 (Y in S11), it is displayed as B5 vertical (S12), and when t is shorter than t5 (N in S11), it is displayed as B5 horizontal (S13).
). Repeat this until the lowest paper feed tray 20 (S1
4). During continuous copying, if the transfer paper in the paper feed tray 20 runs out, the transfer paper size display will intermittently display the same size, and only when it is detected that the transfer paper size is different, the transfer paper size will be changed. indicate.

Next, a second embodiment will be explained with reference to FIGS. 5 and 6. In this embodiment, the transfer paper size detected by the size detection switch group 6 (first transfer paper size detection means),
Registration sensor 4 and discharge sensor 5 (second
If the detection results of the transfer paper size detected by the transfer paper size detection means (transfer paper size detection means) do not match, it is determined that the information from the size detection switch group 6 is incorrect, and the paper feed tray 20 is
LE of the warning display section 50 shown in FIG.
D lights up or flashes to prompt the user with a warning. FIG. 5 shows the size detection switch group 6 of the paper feed tray 20.
The size detection switch group 6 consists of 61 to 64 switches (push switches), and part of the side fence 20a and end fence 20b that move according to the size of the transfer paper are the switches 61 to 6.
The transfer paper size is detected by pressing any of 4. This transfer paper size detection mode is as shown in the table of FIG. 6, and since there are four switches in principle, it is possible to detect 4 bits of information, that is, 16 different transfer paper sizes.

Next, a third embodiment will be explained. In this embodiment, in the duplex and composite copy modes, if the size detection switch group 6 does not match the detection information of the registration sensor 4 and ejection sensor 5, the second copy operation is not performed and the ejection is performed. Then, a warning is prompted to the user by lighting or blinking the LED of the warning display section 50 on the operation section.

[0013]

According to the invention as set forth in claim 1, the size of the fed transfer paper is detected by the transfer paper size detection means provided on the conveyance path and displayed on the display means. Since it is not necessary to provide a transfer paper size detection mechanism on the base, the structure of the paper feed base can be simplified, and moreover, the transfer paper size can be detected reliably. According to the second aspect of the invention, since the above operation is performed after the main switch is turned on and the sheets are sequentially fed from each paper feed table, the startup time of the copying apparatus can be effectively utilized. According to the third aspect of the invention, the transfer size displayed on the display means based on the detection result of the first transfer paper size detection means provided on the paper feed table and the second transfer paper size detection means provided on the conveyance path. If the transfer paper size detection results do not match, the selection of the paper feed tray is disabled and a message to that effect is displayed. If the transfer size displayed on the display means based on the detection result of the first transfer paper size detection means provided on the table does not match the transfer paper size detection result of the second transfer paper size detection means provided on the transport path, the Since the paper is ejected without performing a paper feeding operation and a message to that effect is displayed, troubles due to differences in transfer paper size can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram of a copying apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a copying apparatus.

FIG. 3 is a configuration diagram of the operating section.

FIG. 4 is a flowchart showing control details according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing transfer paper size detection means in the paper feed tray according to the second and third embodiments.

FIG. 6 is an explanatory diagram similarly showing a transfer paper size detection mode.

[Explanation of symbols]

1 CPU 2 Operation section 4 Registration sensor 5 Paper discharge sensor 6 Size detection switch group 12 Main switch 20 Paper feed tray 43 Paper tray selection key 49 Transfer paper size display section 50 Warning display section

Claims (4)

[Claims] 1. A copying apparatus comprising a plurality of paper feed trays, a transfer paper detection means for detecting the size of the transfer paper, and a display means for displaying the size of the transfer paper on the paper feed tray, in which the A copying apparatus comprising: a control means for displaying a transfer paper size on the display means based on a detection result of the transfer paper size detection means that detects the size of the transfer paper loaded on each paper feed table. 2. In claim 1, after the main switch is turned on, the control means sequentially feeds paper from each paper feed tray, and the transfer paper size detection means detects the size of the transfer paper stored in each paper feed tray. A copying device characterized by detecting paper size. 3. A paper feed tray including a position regulating member for regulating the position of the transfer paper, and a first paper feed tray for detecting the size of the transfer paper stored in the paper feed tray from the regulation position of the position regulation member. a transfer paper size detection means, a display means for displaying the transfer paper size detected by the first transfer paper size detection means and a paper feed table in which the transfer paper is stored, and a display means for storing the transfer paper to be fed. a second transfer paper size detection means for detecting the transfer paper size within the conveyance path, and the control means selects the transfer paper size displayed on the display means. paper size and the second
The transfer paper size detected by the transfer paper size detection means is compared with the transfer paper size, and if they do not match, selection of the paper feed tray displayed on the display means is disabled and a warning is displayed on the display means. Characteristic copying device. 4. A paper feed tray including a position regulating member for regulating the position of the transfer paper, and a first paper feed tray for detecting the size of the transfer paper stored in the paper feed tray from the regulation position of the position regulation member. a transfer paper size detection means, a display means for displaying the transfer paper size detected by the first transfer paper size detection means and a paper feed table in which the transfer paper is stored, and a display means for storing the transfer paper to be fed. a second transfer paper size detection means for detecting the transfer paper size in the conveyance path, and when duplex and composite copy modes are selected, the control means The transfer paper size displayed on the display means is compared with the transfer paper size detected by the second transfer paper size detection means, and if they do not match, the paper is ejected without refeeding. A copying apparatus characterized in that the display means displays a warning.