JPH01291265A - Copying machine - Google Patents

Abstract

PURPOSE:To simplify and secure the setting of density and to prevent miscopies by performing an action for reading the density of an original independently of a copying action just by depressing a key switch on an operation panel. CONSTITUTION:In case of the original 30 which evidently becomes the miscopy in an automatic density mode, and area where texture should be skipped is shifted to a density detected area and a reading mode selection key 13 is depressed to select a reading mode. By depressing a start key 9, thereafter, idling scanning in an automatic density detection mode is performed and a density notch is mechanically read and appropriately selected, so that the machine becomes in a waiting state of waiting for depressing the start key 9 in the above-mentioned state. Then the original is set in a regular position and the start key 9 is depressed. Thus, an operator can obtain a desired copy from a 1st one without miscopying.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a copying machine, and particularly to a means for changing copy density by changing a bias and an exposure amount according to the density of an original, and a means for automatically changing the density of an original. The present invention relates to a copying machine equipped with an automatic density device that reads and indicates copy density.

[Prior art]

Document density input means in a copying machine include one using a key switch and one using a so-called automatic density device disposed in an optical system. In the key-switch system, when the operator switches from automatic density mode to manual density setting mode using a key switch, the operator judges the density of the original and manually enters the density using the keys. It is inaccurate because it does not read the density of the original, and to compensate for this, mistakes such as copying are made by copying.

In addition, in automatic density mode, the original density reading position is fixed, and the original density reading mode and copy mode are operated in conjunction with each other, so operations cannot be performed on original originals with large density differences. The copy intended by the person cannot be obtained, resulting in a mistaken copy.

〔the purpose〕

The present invention has been made in view of the above-mentioned inconveniences of conventional copying machines, and its purpose is to easily and reliably set the density to prevent copy errors such as copying with background stains and overcopying. The objective is to provide a copying machine that can perform

〔composition〕

To achieve this objective, the present invention provides a means for changing the copy density by changing the bias and exposure amount according to the density of the original, and an automatic means for automatically reading the density of the original and instructing the copy density. A copying machine equipped with a density device is characterized in that the operation of reading the density of a document is performed independently of the copying operation by pressing a key switch on an operation panel.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

FIG. 1 is an explanatory diagram schematically showing an operation panel of a copying machine according to the present invention. In the figure, l is the operation panel, 2 is the interrupt key, 3 is the interrupt display, 4 is the number confirmation/enter key,
5 is a numeric keypad, 6 is a display panel, 7 is a preheat/mode clear key, 8 is a preheat display, 9 is a start key, 10 is a clear stop key, 11 is an automatic density key, 12 is a density adjustment key, 13 is a read mode selection keys, 14 is the paper selection key, 15 is the same size key, 16 is the enlargement key, 17 is the reduction key, 18 is the zoom key, 19 is the size change key, 20 is the erase key, 21 is the page continuous copying key, 22 is the size A unified/automatic paper selection key, 23 indicates a sorter key.

FIG. 2 shows a manuscript used to explain the operation of the copying machine according to the invention. The original 30 has an area 30 that is not soiled.
It consists of a and a smudged area 30b. Such manuscript 3
0 concentration using the automatic concentration device of the main unit (Figures 3 and 4).
The area in which sampling is performed (described later in the figure) is the area indicated by 30c.

FIG. 3 is a schematic diagram showing an example of an automatic concentration device, in which 40 is an exposure lamp, 41 is a detector, 42 is an optical fiber, and 43 is an optical fiber cable. In FIG. 3, fal indicates the detection start position, and Tbl indicates the detection end position. FIG. 4 shows the detection position shown in FIG. 3 on the document, that is, the detection location.

When the operator switches the mode from the automatic density mode to the density switching mode using a switch, the area 30b is moved to the area 30c by shifting the document, the optical system is scanned blankly, and the density of the area 30b is read by the automatic density device. Select the concentration notch by By doing so, the operator can obtain copies with optimal density without making copy mistakes such as trial copying.

In the case of a document 30 as shown in FIG. 2, it is obvious that the intended copy cannot be obtained using a conventional automatic density device.In such a case, the operator sets the density in manual mode, but the document Since the density of the image is judged visually, it is inaccurate and causes mistakes in copying such as sampling. Further, since automatic density reading of the original density is performed in conjunction with the copy mode, it is not possible to use the original density reading function without copying mistakes.

According to the present invention, as shown in FIG. 2, in the case of a document 30 that is clearly likely to be miscopied with automatic density, the area where the background and skin should be skipped is shifted to the density detection area, and the reading mode selection key 13 ( 1) to select the reading mode. Thereafter, by pressing down the start key 9, automatic density detection mode empty scanning is performed, and the density notch is mechanically read and optimally selected. In this state, the device enters a standby state waiting for the start key 9 to be pressed. Next, set the original in the correct position and press down on the start key 9. With this procedure, the operator can obtain the desired copy from the first copy without making a copy error.

FIG. 5 is a flowchart of read mode selection control. When the read mode selection key 13 is pressed down, the read mode selection key-on flag remains at 1. When key 13 is released, this flag is reset. For this reason, key 1
The process when pressing 3 is performed only once to prevent chattering.

FIG. 6 is a flowchart of the read mode selection operation process. In this flowchart, if the start key is on, it is determined whether the reading mode is on, and if it is on, it is determined whether the automatic concentration sensor is on timing. If it is the on timing, turn on the automatic concentration sensor. Next, determine whether it is time to read the concentration? Start reading M times. Furthermore, when the concentration reading is finished, the concentration reading is finished, and the peak value of the read value is stored in the memory.
Set the read mode data present flag to 1 and reset the read mode selection.

〔effect〕

As described above, according to the present invention, the reading operation of the original density is performed independently of the copying operation by pressing down the key switch on the operation panel. It is possible to provide a copying machine that is effective in preventing copy mistakes such as.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating the operation panel of a copying machine according to the present invention, FIG. 2 is a schematic diagram of a document used to explain the operation of the copying machine according to the present invention, and FIG. FIG. 4 is an explanatory diagram showing the detection position of FIG. 3 on the document, FIG. 5 is a flowchart of reading mode selection control, and FIG. 6 is a flowchart of reading mode selection operation processing. 1...Operation panel, 13...Reading mode selection key. Agent Patent attorney Kenjibu Take (1 other person) R1 Figure 6 ND

Claims (1)

[Claims] In a copying machine equipped with a means for changing the copy density by changing the bias and exposure amount according to the density of the original, and an automatic density device that automatically reads the density of the original and instructs the copy density, the density of the original can be adjusted. A copying machine characterized in that the reading operation is performed independently from the copying operation by pressing a key switch on the operation panel.