JPS6283944A - Copying machine having paper feed tray - Google Patents

Abstract

PURPOSE:To prevent paper of different size from being fed from a paper feed tray, by providing an action stopping means which compares the detected size of a paper size detecting means with the selected size of a paper size selecting means to stop copying action when the compared size is different. CONSTITUTION:If a printing switch is controlled, a machine performs a copying process to finish a fixing process, and if paper is discharged to a paper discharge tray 13, 1 is added to the content of a counter C, and when its content is not equal to a preset sheet quantity M, it is discriminated whether or not paper is fed from a feed paper tray 5. And when the paper is fed from the feed paper tray 5, a paper size detecting means, comprising a lever 51, feed paper guide 52a and 52b, detects a size S' of the paper, mounted onto the feed paper tray 5, to be compared with a preset paper size S, and copying action is temporarily stopped for no agreement of the both sizes. In this way, the machine, preventing a fed of the paper in size different from the preset paper size, enables miscopying to be prevented.

Description

Detailed Description of the Invention [Technical Field] The present invention provides a paper feeder in which at least one of a plurality of paper feeders is provided with a paper size detection means for detecting the size of the paper placed thereon. Regarding a copying machine that is a tray.

<Summary of the Invention> In order to prevent the occurrence of copy mistakes, a copying machine having a paper feed tray according to the present invention has a paper size detecting means that detects the size of paper placed on the paper feed tray. A means for comparing the paper size and the paper size selected by the paper size selection means is provided, and by stopping the copying operation when the two differ, paper of a different size from the predetermined size is fed during continuous copying operation. It is designed to prevent this from happening.

<Prior Art and Its Disadvantages> In order to simplify paper feeding work in copying machines, a paper cassette containing a plurality of sheets of a single size paper is installed in a paper feeding section. Paper is fed one by one from this paper cassette to the copying process section. Paper of the size stored in the paper cassette installed in the paper feed section can be fed immediately, but there is a limit to the number of paper cassettes that can be installed in the paper feed section at one time. It is not possible to immediately supply paper of all sizes that can be copied.

For this reason, in the past, a paper feed tray was provided in a part of the paper feed section so that paper of a required size could be placed on the tray. This paper feed tray can place about 50 sheets of plain paper at a time, and is equipped with a paper size detection means for detecting the size of the paper placed thereon.

This paper size detection means detects the size of the paper placed on it, and if it matches the paper size selected by calculation or input, the paper is fed one by one from the paper feed tray. .

However, since multiple sheets of paper can be stored at once, there are cases where sheets of multiple sizes are stored. For example, when a B5 size paper is loaded, do not remove the B5 size paper (there are cases where B4 size paper is loaded and copying is performed. In this way, multiple sheets can be continuously copied. When this is done, if the number of B4 size sheets placed is less than the set number of copies, the B5 size paper located below the 84 size sheet will be fed continuously. There was a drawback that copying errors occurred inadvertently.

<Object of the Invention> In view of the above-mentioned conventional drawbacks, the object of the present invention is to prevent paper of a size different from the paper size involved in copying work from being fed from a paper feed tray, and to prevent the occurrence of copy mistakes. The purpose is to provide a copying machine that can prevent

<Structure and Effects of the Invention> A copying machine having a paper feed tray of the present invention includes a paper size selection means for selecting a paper size for copying work, and a paper size selection means for detecting the size of paper placed on the paper feed tray. A copying machine equipped with a paper size detection means, the copying machine comprising: a size comparison means for comparing the paper size detected by the paper size detection means during a copying operation with the paper size selected by the paper size selection means; The present invention is characterized by comprising operation stopping means for stopping the copying operation when the two sizes are different in the size comparing means.

With the above configuration, according to the present invention, the size of the paper placed on the paper feed tray is always detected by the paper size detection means during copying work, and the detected paper size and the selected paper size are The comparing means compares the two sizes, and if the two sizes are different, the copying operation can be stopped by the operation stopping means. Therefore, when the paper of the selected size placed on top of the paper of another size runs out during continuous copying of multiple sheets, the paper of the other size located below is fed to the copying process section. Therefore, the occurrence of copy mistakes can be prevented.

<Embodiment> FIG. 2 is a schematic front view showing the structure of a copying machine having a paper feed tray according to an embodiment of the present invention.

A photosensitive drum 3 is provided approximately at the center of the interior of the copying machine main body 1, and a copying process section 2 is configured. Paper feed rollers 8 to 10 are rotatably attached to the right side inside the copying machine main body 1, and constitute a paper feed section 4. From the right side of the copying machine body 1, there are a paper feed tray 5 and a paper cassette 6.
and 7 are mounted to face each of the paper feed rollers 8 to 10. A paper ejection roller 14 is provided on the left side of the copying machine main body 1, and a paper ejection tray 13 is attached thereto, forming a paper ejection section 15. An IE transport path 11 is formed from the paper feed section 4 to the paper discharge section 15 via the copy process section 2.

During the copying process, sheets are fed one by one from either the paper feed tray 5 or the paper cassette 6.7 to the copy process section 2 by the operation of paper feed rollers 8-10. The paper that has completed the transfer step of the copying process is guided to the fixing roller 12 by the paper conveyance path 11, where the fixing step is performed. Thereafter, the paper is discharged onto the paper discharge tray 13 by the operation of the paper discharge roller I4.

FIG. 3 is an external perspective view of the paper feed tray installed in the copying machine.

A paper feed tray 5 attached to the paper feed section 4 is formed on a substantially flat plate, and paper is placed on the upper surface of the paper feed tray 5 . Paper feed guides 52a and 52b are provided at the upper end of the paper feed tray 5 on the paper feed section 4 side. Paper feed guide 52a
, 52b is in the direction indicated by arrow B or C in the figure, that is,
It is movable in a direction perpendicular to the paper feeding direction.

Further, one paper feed guide operates in the opposite direction to the operation of the other paper feed guide. For example, when paper feed guide 52a is moved in the direction of arrow C, the other paper feed guide 52b is moved in the direction of arrow B. Paper feed guide 52 on the top of paper feed tray 5
In the vicinity of a and 52b, a size index 53 is written at a position corresponding to the edge of each sheet. When placing paper on the paper feed tray 5, the paper feed guides 52 a, 52 b
is moved so that it matches the size index 53 of the size of the paper to be placed. As a result, the paper feed guides 52a, 52
The inner surface of b contacts both ends of the paper and restricts the movement of the paper during paper feeding.

A lever 51 is provided near the center of the upper surface of the paper feed tray 5. This lever 51 is normally exposed to the outside from the top surface of the paper feed tray 5 as shown in the figure.

When paper is placed and a force in the direction of arrow A is applied, lever 5
1 is stored inside the paper feed tray 5. A spring (not shown) is attached below this lever 51. When there is no paper above, the lever 51 returns to the state shown in the third ryJ by the elastic force of the spring. The lever 51 and paper feed guides 52a, 52b described above constitute a paper size detection means, and the size of the paper being placed is detected based on the state of the lever 51 and the position of the paper feed guides 52a, 52b.

FIG. 1 is a flowchart showing the operation of the copying machine during the copying process.

After the power is turned on, step nl (hereinafter “step ni”)
” is simply referred to as “ni”), the contents of a counter C that counts the number of copying processes are cleared. Then n
When the operator inputs copy data such as the number of copies M in step 2, the process advances to n3. In step n3, the size S is calculated based on the input copy magnification and the detected document size, or is directly input. After this n4
It is determined whether or not there is paper of the paper size S set in the paper feed section 4. If there is no paper of paper size S at n4, the process advances to n5 and a display prompting the user to load paper of size S is displayed. If there is paper of size S in the paper feed section 4 at n4, the process proceeds to n6, where the paper feed rollers 8 to 10 at the position where the paper of size S is loaded is controlled to operate, and the paper of size S is loaded. Select paper.

When the print switch is operated at n7, a copying process is performed at n8. When the fixing process is completed and the paper is discharged to the paper discharge tray 13, the content of the counter C is incremented by 1 at n9. Then, at nlO, the contents of counter C become n.
It is determined whether the number of copies is equal to the number of copies M set in step 2. If the two are equal in nlO, the operation ends. If the content of the counter C is not equal to the set number M, the process proceeds to n11, where it is determined whether or not paper is being fed from the paper feed tray 5. If paper is being fed from the paper feed tray 5 at nil, proceed to n12;
The size S' of the paper placed on the paper feed tray 5 is detected by the paper size detection means. Next, the paper size S set in n13 and the paper size S' detected in n12 are compared. If the two do not match at n13, the copying operation is temporarily stopped at n14. If no paper is fed from the paper feed tray 5 at n11, and if the size S set at n13 and the detected paper size S' match, the process advances to n8 and continues the copying process for the required number of sheets. Ru.

The operations nil to n13 described above correspond to the size comparison means of the present invention, and the operation n14 similarly corresponds to the operation stopping means. When feeding paper from the paper feed tray 5 through these operations, each time the copying process is completed, the paper size detection means detects the size of the paper currently placed, and also detects the size of the paper currently placed. The copying operation can be temporarily stopped when they are compared and the two do not match. Therefore, as shown in FIG. 4, when a B4 size paper 22 is placed above a B5 size paper 21 and a plurality of copies are made in succession, the number of copies is less than the set number of copies. If the number of B4 size sheets placed is small, the B4 size sheets 22 will run out on the paper feed tray 5 halfway. At this time, the paper size detection means detects the B5 size paper 21 at n12, and since the paper size does not match the set paper size, the process proceeds to n14 and stops the operation. Through these operations, paper of a size different from the set paper size is not fed, and copy mistakes can be prevented.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the copying operation of a copying machine having a paper feed tray according to an embodiment of the present invention, FIG. 2 is a schematic front view showing the structure of the copying machine having the same paper feed tray, and FIG. The figure is a perspective view of the appearance of a paper feed cassette installed in the copying machine, and FIG. 4 is a front view illustrating the usage state of the paper feed tray. 51-Lever (paper size detection means), 52a, 52b
-Paper feed guide (paper size detection means).

Claims (1)

[Claims] (1) A plurality of paper feeding means are provided, a paper size selection means is provided for selecting a paper size related to copying work, and a plurality of sheets of paper can be placed on at least one of the paper feeding sections, and the In a copying machine having a paper feed tray equipped with a paper size detection means for detecting the size of the paper that has been printed, the paper size detected by the paper size detection means and the paper selected by the paper size selection means during the copying operation. A copying machine having a paper feed tray comprising a size comparison means for comparing the sizes, and an operation stop means for stopping the copying operation when the two sizes are different in the size comparison means.