JPH03126567A - Image forming device - Google Patents

Abstract

PURPOSE:To simplify a complicated mechanism design and a recognition circuit by a method wherein the size of a sheet is identified, a sheet size data transmitted therefrom is recognized, a control bar linearly moves in accordance with the sheet size is provided, and the displacement of the control bar is detected and, thereby, the sheet size is identified. CONSTITUTION:A sheet is inserted to a cassette and set by adjusters 11, 12. The length of a control bar 13 is determined with this operation. By setting the cassette 10 to a device, the control bar 13 depresses a variable voltage bar 15, whereby a partial pressure is produced between an input voltage 14 and a basic resistance 17 to cause an output voltage 21 to be changed. An AD converter 18 converts an analog signal of the changed voltage to a decodable digital signal and transmits the digital signal to a microprocessor 19. Based on the changed voltage value, this microprocessor 19 judges the size of a sheet set in the sheet cassette 10 and displays it on a control panel 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus that recognizes the size of a sheet set in the apparatus.

[Conventional technology]

Conventionally, this type of image forming apparatus uses a large number of sensors to perform image forming processing in order for the apparatus to recognize the presence or absence of a storage means for storing a large number of sheets and the size of the stored sheets. It had become.

[Problem to be solved by the invention]

The above-mentioned conventional image forming apparatus has the disadvantage that it uses a large number of sensors to recognize the presence or absence of sheet storage means and the size of the stored sheets, and requires a complicated mechanical design. .

[Means to solve the problem]

The image forming apparatus of the present invention is an image forming apparatus having one or more means for storing sheets of arbitrary size.
means for identifying the presence or absence of the storage means and the size of sheets of arbitrary size stored in the storage means; a control unit for recognizing and determining seed size data sent from the identification type stage; The present invention includes a control panel for displaying information on the sheet, a control bar that moves linearly according to the size of the sheet, and means for detecting displacement of the control bar and identifying the size of the sheet.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the invention. In Fig. 1, this embodiment shows a cassette (second cassette) that stores sheets of any size.
10), a control bar 13 that expands and contracts depending on the size of the sheet, a variable resistor 16 for electrically reading the length of the control bar 13, and an analog signal sent from the variable resistor 16 that is digitalized. It includes an AD converter 18 for converting into a signal, a microprocessor 19 for recognizing and determining the information, and a control panel 20 for displaying the size of the read sheet.

FIGS. 2(a) and 2(b) show a sheet cassette used in one embodiment of the present invention. In FIG. 2, this sheet cassette 10 includes a sheet length adjuster 11 and a sheet width adjuster 12.
and a control bar 13 whose length changes as the regulator 11, 12 changes. FIG. 1 will be explained again. First, put any sheet into the sheet cassette,
Set the sheet using regulators 11 and 12. With this operation, the length of the control bar 13 is determined. By setting this cassette 10 in the device, the control bar 13
By pressing the variable voltage bar 15, the input voltage 14 and
A voltage division occurs between the basic resistor 7 and the output voltage 21 changes. An AD converter 18 converts the changed voltage into an analog signal into a readable digital signal and sends it to one microprocessor. This microprocessor 19 first recognizes that the input voltage 4 has changed, and then
is set. Further, the size of the sheet set in the sheet cassette 10 is determined from the changed voltage value, and this information is displayed on the control panel 20. A series of image forming processes are then performed.

〔Effect of the invention〕

As explained above, the present invention has the effect of simplifying complex mechanical designs and recognition circuits by determining the presence or absence of sheet cassettes and the size of sheets set in sheet cassettes in an analog manner. be.

/ Brief description of the drawings Fig. 1 shows an embodiment of the present invention, Fig. 2 (a), (
b) is a diagram showing a sheet cassette used in this example.

10... Cassette, 11... Sheet length adjuster, 12
... Seat width adjuster, 13... Control bar, 14...
- Input voltage, 15... Variable voltage bar 16... Variable resistance, 17... Basic resistance, 18... AD converter, 19... Microprocessor-120... Control panel, 21... Output voltage.

Figure 2

Claims (1)

[Claims] In an image forming apparatus having one or more means for storing a large number of sheets of arbitrary size, means for identifying the presence or absence of the storage means, the size of the sheet of arbitrary size stored in the storage means, and the identification type. A control unit that recognizes and judges the seed size data sent from the tray, a control panel that displays this information, and a control bar that moves in a straight line according to the size of the sheet, and detects the displacement of the control bar. and means for identifying the size of the sheet.