JPH02170174A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent an erroneous image from being formed by making an original cover opened in two stages and returning an image forming condition to an initial state when the original cover is opened to the 2nd stage. CONSTITUTION:When the original cover 5 is closed, the surface (a) of the notched part 61 of a shaft 60 is made to correspond to a pressing member 62. When the cover 5 is little opened, the surface (b) is made to correspond to the member 62 and the cover 5 is fixed at the opening position of the 1st stage. When the cover 5 is opened more, the surface (c) is made to correspond to the member 62 and the cover 5 is fixed at the opening position of the 2nd stage. When the cover 5 is at the opening position of the 2nd stage, a detector 63 is turned on by an arm 5a fixed to the cover 5. Thus, erroneous copying is prevented from occurring, because the initial state is obtained just by opening the cover 5 to the position of the 2nd stage.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention relates to image forming, such as a copying machine, which reads an image of a document and forms an image on paper according to the read signal. Regarding equipment.

(Prior Art) In recent years, copying machines that utilize digital technology and use thermal transfer type ink ribbons have been developed and put into practical use.

However, in such a copying machine, an operator uses keys on an operation panel to set copy conditions such as the number of copies, copy density, copy magnification, etc. to perform copying. Such copying condition settings are designed to return to the initial state (standard state) when no operation is performed before a predetermined period of time. In such an apparatus, when an operator different from the previous operator attempts to make a copy, a copy condition clear key is input and the corresponding copy is made.

However, with such a copying machine, when the operator attempts to make a copy immediately after the copy made by the previous operator, the operator assumes that the copying conditions are in the standard state and does not insert the copying condition clear key. There is a drawback that copying may be started as it is, resulting in erroneous copying.

Therefore, there is a drawback that there is a possibility that erroneous image formation may be performed.

(Problems to be Solved by the Invention) As described above, there is provided an image forming apparatus that eliminates the drawback that erroneous image formation may be performed, and that can prevent the occurrence of erroneous image formation. The purpose is to

[Structure of the Invention] (Means for Solving the Problems) The image forming apparatus of the present invention includes a reading means for optically scanning and reading a document placed on a document table, and setting various image forming conditions. A setting means, an image forming means for forming an image on an image forming medium using an image forming medium according to an image forming signal obtained by the reading means and an image forming condition set by the setting means, and the original document. A document cover which is provided on the document table so as to be openable and closable, and which covers the document placed on the document table. a detection means for detecting that it is a document; and a control means for controlling the setting means to set image forming conditions to an initial state when the detection means detects that the open state of the document cover is a two-stage opening. It consists of:

The image forming apparatus of the present invention also includes a reading means for optically scanning and reading a document placed on a document table, a setting means for setting various image forming conditions, and a setting means for setting the image forming conditions set by the setting means. Image formation in which an image is formed on a medium to be imaged using an image forming medium according to a display means for displaying, an image forming signal obtained by the reading means, and image forming conditions set by the setting means. means, a document cover provided on the document table so as to be openable and closable, and to cover the document placed on the document table; fixing means for fixing the open state of the document cover in two stages; a detecting means provided on the document table to detect that the original is the original, and a detecting means provided on the document table so as to be openable and closable, and when the detecting means detects that the original is the original, the setting means sets the image forming conditions to the initial state. The control means is configured to perform display control for setting and controlling the image forming conditions displayed by the display means and returning the image forming conditions to the initial state.

(Function) According to the present invention, the document cover is opened in two stages, and when the document cover is opened to the second stage, the image forming conditions are returned to the initial state.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 3 and 4 show, as an example of the image forming apparatus of the present invention, a thermal transfer type color copying machine that can selectively produce multicolor copies.

That is, 1 is a main body of a copying machine, and an operation panel 50 is provided at the front of the upper surface of the main body 1. The upper part of the main body 1 is a document O set on a document table (transparent glass) 2.
There is a document scanning section 3 that scans and reads the document, and an image forming section 4 at the bottom. Note that 5 is a document cover provided on the document table 2 so as to be openable and closable. Further, the document table 2 is fixed to the main body 1.

As shown in FIGS. 1(a) to (C) and FIG.
It is fixed to a shaft 60 which is rotatably passed through between a and 1a. There are three surfaces aSb and c in the middle of this shaft 60.
A notch 61 consisting of
The original cover 5 is opened in two stages by the holding member 62 attached to the main body 1.

That is, as shown in FIG. 1(a), when the document cover 5 is closed, the surface a of the notch 61 of the shaft 60 corresponds to the presser member 62, and as shown in FIG. 1(b), When the document cover 5 is slightly opened, the face of the notch 61 of the shaft 60 corresponds to the presser member 62, and the document cover 5 is fixed at the first opening position, as shown in FIG. like,
When the document cover 5 is opened, the shaft 60 is attached to the presser member 62.
The surface C of the notch 61 corresponds to the original cover 5, and the document cover 5 is fixed at the second open position.

When the document cover 5 reaches the second open position, as shown in FIG. 2(c), the detector 63 is turned on by the arm 5a fixed to the document cover 5. . This detector 63 is composed of a photointerrupter, a microswitch, and the like.

In both the first and second stages in which the document cover 5 is opened,
It is possible to replace or change the position of the original on the original platen 2, and when the operation is performed in the same copy mode or by the same operator, the original cover 5 is moved to one level. Open your eyes and when the operation is complete,
The document cover 5 is opened to the second stage.

As shown in FIG. 5, the operation panel 50 includes a copy key 51 for starting a copying operation, a numeric keypad 52 for setting the number of copies, etc., and a copy mode setting key 53a1 for setting a color copy mode, a monochrome copy mode, etc. key 53a
A copy mode display 53 that displays the copy mode set in
b1 Copy density setting key 54a15 for setting copy density
4b5 a copy density display 54c that displays the copy density set by the copy density setting keys 54a and 54b;
..., as a copy magnification setting key to set the copy magnification (
7) DOWN+-55a, 100% key 55b, UP key 5501 Jam display section 56 that displays the jam position, message display section 57 that displays the number of copies and copy magnification as well as various messages, color density setting section 58 , and a clear key 59 for clearing each copying condition.

The color density setting section 58 sets the color density of yellow Y5 magenta M1 cyan C1 black B, and sets the color density of each color to
Color density UP key 58a1... to make each color lighter (DOWN) color density D
It is composed of an OWN key 58b5... and a color density display 58c1 showing the color density of each color.

The document scanning section 3 is configured as shown in FIGS. 4, 6, and 7, for example. That is, a first carriage 7 in which an illumination lamp 6 is installed as a light source, a second carriage 8 that bends the optical path with a mirror, a zoom lens 9, and a photoelectric converter 11 that guides the reflected light from the original 0 and changes the optical path length when changing magnification. a mirror portion 10 that performs correction, and a photoelectric converter (conversion means) 1 that receives reflected light from the original O]. , and a drive system (not shown) that changes the position of each part.

The first carriage 7 includes an illumination lamp 6 that irradiates light onto the document 0, a glue deflector 12 that serves as a reflector that collects the light from the illumination lamp 6 onto the document surface, and a second carriage that directs the reflected light from the document O. A mirror 13 that guides the camera to the 8 side is mounted.

The second carriage 8 is equipped with mirrors 8 a 18 b that guide the light guided by the mirror 13 to the zoom lens 16 . The first and second carriages 7.8 are connected to each other by a timing belt 18, and the second carriage 8 moves in the same direction at a speed of ]/2 of the first carriage 7. This makes it possible to scan so that the optical path length up to the zoom lens 16 is constant.

The zoom lens 16 has a fixed focal length and is moved in the optical axis direction when changing the magnification.

” 1. Mirror part 10 has two mirrors 10a11, Ob
The position of the mirrors 10a, 1, and Ob is changed according to the change in the optical path length corresponding to the selected magnification ratio, and the light from the zoom lens] 6 is transmitted between the two mirrors. 10a.

1. By bending the optical path with Ob, the light is guided to the photoelectric converter]1.

The photoelectric converter 11 converts the reflected light from the original O into a cyan image by photoelectrically converting the image of the original O.

Green, yellow (or red, green.

It separates and outputs a color signal of (blue) light, and is mainly composed of, for example, a CCDCD billline image sensor. In this case, one pixel of the original O corresponds to three consecutive elements (C, G, Y) of the CCD sensor. The output of the photoelectric converter] 1 is output to an A/D converter 91, which will be described later.

The above first and second carriages 7.8, Mira 10a, 10b
The movement of each is performed by a stepping motor 18.

As shown in FIG. 7, the first and second carriages 7.8 are connected to a drive pulley 4 connected to the rotating shaft of the stepping motor 18 and a timing belt stretched between the idle pulley 15 and 16. It is designed to be moved according to the movement of 9.

]2'' The zoom lens 16 is operated by a corresponding stepping motor (not shown) in a spiral shirt! - (not shown) rotates and is moved in the optical axis direction by this spiral movement.

The image forming section 4 is configured as shown in FIG. 4, for example. That is, the platen drum 22 is disposed approximately at the center of the image forming section 4 . The platen drum 22 has a periphery made of an elastic material such as rubber, and functions as a platen roller for the thermal head 24. The platen drum 22 rotates clockwise to wrap the paper P around itself, thereby preventing the paper P from shifting during overlapping printing. Pressure rollers 25, . . . are provided around the platen drum 22 at predetermined intervals to prevent the paper P from floating up from the platen drum 22.

The circumference of the platen drum 22 is slightly longer than the length in the longitudinal direction of the maximum paper size.

]-3 A thermal head 24 is disposed diagonally below the left side of the platen drum 22. The thermal head 24 is attached to a heat radiator integrally formed on the rear end surface of the holder. Then, the platen drum 22 and the thermal head 24
An ink ribbon 26 as an image forming medium is interposed between the two.

The cores 30 and 31 of the ink ribbon 26 are connected to a drive shaft of a motor (not shown) via a drive force transmission mechanism (not shown), and are driven to rotate as required.

A paper feed roller 41 is provided at the lower portion of the main body 1, and is adapted to take out sheets P, which serve as image forming media, stored in the paper feed cassette 20 one by one.

The paper P taken out by the paper feed roller 41 is transferred to the transport roller 42
After being sent to the registration row 21 disposed diagonally above and to the left of the conveyance row 42 and aligning its tip,
The registration roller 21 transports the sheet toward the platen drum 22 via the guide 43, and the gripper 23, the pressing roller 25, etc. wrap the sheet around the platen drum 22, thereby accurately feeding the sheet. Here, the paper feed cassette 20 is detachable from the side of the main body 1. Note that 46 in FIG. 4 is a manual paper feeding device for manually feeding paper P and the like. The paper P fed from the manual paper feeder 46 is also wound around the platen drum 22 in the same manner as described above.

” 1. The paper P whose leading edge is fixed by the gripper 23 is
The thermal head 2 wraps around the platen drum 22 by rotating clockwise, and after the tip passes through the printing area, the thermal head 2
4 is pressed against the platen drum 22, and printing is performed.

When printing of the first color is completed, the platen drum 22 has rotated approximately once. Here, the thermal head 24 is once released, the ink ribbon 26 is wound up, and the next color is located.

Then, the platen drum 22 starts rotating clockwise again, printing is performed by the thermal head 24, and the next color is overprinted (printed).

In this manner, in the case of full-color copying, image formation is performed by four operations of yellow, magenta, cyan, and black, or three operations of yellow, magenta, and cyan. In the case of a single color such as black, it is performed in one operation.

When discharging paper, the platen drum 22 is rotated clockwise until it reaches the rear end of the paper P or the paper discharging guide 27, and when the platen drum 22 is reached, the platen drum 22 is rotated counterclockwise. A separation claw (not shown) separates the rear end of the paper P from the platen drum 22 and guides it to the paper discharge guide 27. Finally, the leading edge of the sheet P is released from the gripper 23, and the sheet P, which has been copied and transported by the sheet discharge guide 27, is discharged onto the sheet discharge tray 28 d1.

FIG. 8 schematically shows the overall control system, which includes a main control section 8, a first control section 82, and a second sub-control section 83. The main control section 8] includes an operation panel 50, a correction circuit 84, a luminance/color difference separation circuit 85, an image quality improvement circuit 86, a color signal conversion circuit 87, a binarization circuit 88, and a first sub-control section 82.
, the second sub-control unit 83, and the detector 63, and controls these.

The second sub-controller 682 is connected to the light source control section 89, motor drive section 90, photoelectric converter 11, A/D converter 91, and resolution conversion section 92, and controls these. The light source control section 89 is connected to the illumination lamp 6 and controls its lighting and light amount. That is, the illumination lamp 6 is turned on during a normal image reading operation.

The motor drive unit 90 drives the scanning motor 18 . The second sub-control unit 83 includes a thermal head temperature control unit 9
3. It is connected to the thermal head 31, various detection switches 94, and drive section 95, and controls these. The drive unit 95 is connected to a drive system 96 such as a motor and a solenoid, and drives the drive system 96 .

The correction circuit 84 performs standardization (shading correction, that is, correction of variations in the photoelectric converter 11) on image data (after resolution conversion) obtained by A/D converting the reflected light from the original O.

Further, the color signal conversion circuit 87 will be explained with reference to FIG. The luminance signal (I), color difference signal 1 (C1), and color difference signal 2 (C2) sent from the image quality improvement circuit 86 are sent to the color signal conversion circuit 87, where Y, M, C, Any one of the B color signals is sent to the binarization circuit 88, and the main control section 81 selects the Y, M, C, and B color signals. That is, as shown in the table below, the main control unit 81 receives the signal a.

Y is sent to the binarization circuit 88 by the combination of b.

M, C, and B color signals are selected. Note that the above color signals are automatically selected sequentially (for example, Y+M-+C
→B order).

Further, the main control section 81 is configured to perform a copying operation in a copying mode according to copying conditions set by the operation panel 50. Further, when the main control unit 81 receives the detection signal from the detector 63, it determines that the document cover 5 has reached the two-stage opening position, that is, the current copying process by the operator has ended. ), set the copy mode to the preset standard state (initial state), and press the operation panel 50.
Each display state of density, number of copies, etc. in is set as a standard state (initial state).

Next, the operation in the above configuration will be explained. For example, if the operator places document 0 on the document table 2 and closes the document cover 5, and wants to make a single copy with the standard copy conditions, the operator presses the copy key 51. When inputting data and changing copy conditions, use the operation panel 50.
After setting the copy conditions, the copy key 51 is turned on.

The copying conditions can be set by setting the number of copies using the numeric keypad 52, switching between color and black and white mode using the copying mode setting key 53a, and copying density setting keys 54a, 54.
b to set the copy density, DOWN key 55a,
Use the UP key 55c to change the copy magnification or change the color density U.
The color density of each color is changed using the P key 58a1 color density DOWN key to 58b.

Then, when the copy key 51 is turned on, copying is performed according to the various copying conditions set above.

That is, the reflected light of the light irradiated onto the document O from the verification lamp 6 is imaged on the photoelectric converter 11.

The photoelectric converter 11 converts the light into cyan (C) and green (G).
), separated into yellow (Y) analog color signals, and A/
It is sent to the D converter 91. The A/D converter 91 converts each analog color signal into a digital signal, and outputs the digital signal to the resolution converter 92.

The resolution conversion unit 92 performs resolution conversion to match the resolution of the photoelectric converter 11 and the resolution of the thermal head 24, and sends the result to the correction circuit 84. The correction circuit 84 performs correction processing (shading correction) on each of the C, G, and Y color signals sent from the resolution converter 92 in order to correct variations in the photoelectric converter 11, and performs luminance and color difference separation on the results. to circuit 85. The luminance color difference separation circuit 85 is
Various calculation processes are performed on each color signal of C, G, and Y sent from the correction circuit 84, and a luminance signal (1) and a color difference signal 1 are generated.
(CI) and color difference signal 2 (C2), and send them to the image quality improvement circuit 86. The image quality improvement circuit 86 receives the luminance signal, color difference signal 1, and color difference signal 1 sent from the luminance and color difference separation circuit 85.
The color difference signal 2 is analyzed, subjected to image quality improvement processing such as edge emphasis and character identification, and sent to the color signal conversion circuit 87. The color signal conversion circuit 87 performs color conversion based on the luminance signal, color difference signal 1, and color difference signal 2 that have been subjected to image quality improvement processing, and converts yellow (
Y), magenta (M), cyan (C), black (B)
Converts to any one color signal (signal corresponding to density) of [three primary colors (Y, M, C) plus B during printing] and changes to level corresponding to density signal supplied from main control unit 81 and sends it to the binarization circuit 88. Binarization circuit 88
is the color signal (Y,
M.C.

B) is subjected to area gradation conversion, that is, binarization, using a dither method or the like, and the binarized signal is sent to the thermal head temperature control section 93.

The thermal head temperature control section 93 sends a print signal to the thermal head 24 based on the binarized signal supplied from the binarization circuit 88 .

Further, in response to the input of the copy key 51, the paper P in the paper feed cassette 20 is taken out by the paper feed roller 41, and the taken out paper P is transported by the transport roller 42 and the registration roller 21.

Then, the paper P conveyed by the registration rollers 21 is guided to the platen drum 22 via a guide 43, and its leading end is fixed by a gripper 23. Thereby, the paper P is wound around the platen drum 22.

Depending on such conditions, the thermal head 24:
Printing (that is, image formation) is performed on the paper P wound around the platen drum 22 in accordance with the print signal.

When the printing is finished, the main control section 81 turns off the illumination lamp 6, discharges the paper P wound around the platen drum 22, and ends the copying operation.

Then, the operator opens the document cover 5 to the first stage position as shown in FIG. 1(b), places another document O on the document table 2, and closes the document cover 5. After that, when the copy key 51 is turned on, copying is performed in the same copy mode as the above operation.

Furthermore, when changing the document O, the copying conditions may be changed using the operation panel 50.

Further, when another operator opens the document cover 5 to the second position as shown in FIG. 1(c), a detection signal from the detector 63 is supplied to the main control section 81. Then, the main control unit 81 determines that the document cover 5 has reached the second open position, that is, the current copying process by the operator has been completed, and changes the copy mode to the preset standard state. Then, each display state of the density, number of copies, etc. on the operation panel 50 is set to the standard state. Thereafter, the operator may perform copying in the standard state, or set copying conditions, and copying in accordance with the settings.

As a result, if another operator attempts to make a (standard) copy immediately after the previous operator, the clear key 5
Copying to the standard state can be performed without inputting 9.

As mentioned above, when another operator tries to copy immediately after the previous operator's copy, the operator thinks that the copy conditions are in the standard state and does not input the copy condition clear key. Even if you start copying as is, if you open the document cover 5 to the second position before inserting the copy key 51, it will return to the standard state (initial state), so there will be no chance of erroneous copying. Occurrence can be prevented.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to provide an image forming apparatus that can prevent the occurrence of erroneous image formation.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention, and FIGS. 1 and 2 are diagrams for explaining the state in which the document cover is moved and the state in which it is attached to the main body, and FIG. 3 is an overall view. 4 is a sectional view schematically showing the overall structure, FIG. 5 is a plan view showing the structure of the operation panel, and FIG. 6 shows the main parts of FIG. 4. 7 is a schematic perspective view showing a part of the configuration, FIG. 8 is a block diagram schematically showing the overall control system, and FIG. 9 is a detailed explanation of the color signal conversion circuit. FIG. 0... Original, P... Paper (image forming medium), 1.
・・Main body, 2・Document stand, 3・Document scanning unit, 4・
...Image forming section, 5...Document cover 5a...Arm, 11...Photoelectric converter, 6...Illumination lamp, 22
...Platen drum, 24...Thermal head, 2
6... Ink ribbon (image forming medium), 50... Operation panel, 6o... Shaft, 61... Notch, 62...
- Holding member, 63...detector. Applicant's agent Patent attorney Takehiko Suzue

Claims (2)

[Claims] (1) A reading means that optically scans and reads a document placed on a document table; a setting means that sets various image forming conditions; and an image forming signal obtained by the reading means and the setting means. an image forming means for forming an image on an image forming medium using an image forming medium according to set image forming conditions; a document cover that covers the document that has been read; a fixing means that fixes the document cover in an open state in two stages; a detection device that is provided on the document table so as to be openable and closable and detects that the document is the document; An image forming apparatus comprising: control means for controlling the setting of image forming conditions by the setting means to an initial state when the means detects that the open state of the document cover is in the second stage. . (2) A reading means for optically scanning and reading a document placed on a document table, a setting means for setting various image forming conditions, and a display means for displaying the image forming conditions set by the setting means. and an image forming means for forming an image on an image forming medium using an image forming medium according to an image forming signal obtained by the reading means and an image forming condition set by the setting means, and the original document. a document cover that is provided on the table so as to be openable and closable and covers the document placed on the document table; and a fixing means for fixing the document cover in two open states; a detection means for detecting that the open state of the document cover is in the second stage; and when the detection means detects that the open state of the document cover is in the second stage, controlling the image forming condition by the setting means to be set to an initial state; An image forming apparatus comprising: a control means for performing display control for returning the image forming conditions displayed by the display means to an initial state.