JP2002265115A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device for feeding a rolled paper sheet realized in visual confirmation of the residual quantity of the paper sheet by a user at a stage of setting the rolled paper sheet when the rolled paper sheet is ended or exchanging the rolled paper sheet and realized in the control of the residual quantity of the paper sheet with a simple means at a low cost. SOLUTION: This image forming device is provided with a transparent holder member 1023 for holding the rolled paper sheet 1022 when setting the rolled paper sheet in a paper feeding stage. The holder member has residual quantity scales 1024-1027 for visually confirming the residual quantity of the rolled paper sheet. This image forming device having a means for setting the confirmed residual quantity of the paper sheet and a display means also has a means for setting paper thickness of the rolled paper sheet and a means for setting length of the rolled paper sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus using roll paper. Further, the present invention can be applied to an image forming apparatus having a sheet feeding stage.

[0002]

2. Description of the Related Art In an image forming apparatus using roll paper, a means for measuring the remaining amount of roll paper is to rotate the roll forward and backward at a constant rotation speed when the roll paper is set on a tray. There is a means for measuring the remaining time of the roll paper by measuring the passage time of the conveyed roll paper through the sensor. However, in this method, since the remaining amount of the roll paper is measured after the roll paper is set on the tray, it takes some time to measure the remaining amount, and the time from when the roll paper is set until copying becomes possible is set. I need. Further, complicated control such as forward rotation and reverse rotation control for measuring the remaining amount of roll paper is required. Further, as another method, Japanese Patent Application Laid-Open No. H5-1149
As disclosed in Japanese Patent Application Laid-Open No. 71-71, there is a device that uses a roll paper on which a warning mark is printed, detects the warning mark, and displays the remaining amount of the roll paper on a display unit.

[0003]

SUMMARY OF THE INVENTION In an image forming apparatus for feeding roll paper as a paper feed tray, when the roll paper reaches the end of paper or when the roll paper is replaced,
It is an object of the present invention to enable a user to visually check the remaining amount of paper at the stage of setting roll paper, and also to achieve control of remaining amount of paper by inexpensive and easy means.

[0004]

According to an aspect of the present invention, there is provided an image forming apparatus using roll paper, wherein the holding of the roll paper is performed when the roll paper is set in a paper feed stage. The member is formed of a transparent member, the holding member has a remaining amount scale for visually confirming the remaining amount of paper of the roll paper, and has means for setting the confirmed remaining amount of paper and displaying means. The image forming apparatus is characterized in that the image forming apparatus has means for setting the thickness of the roll paper.

According to a second aspect of the present invention, in the image forming apparatus using roll paper, when the roll paper is set in a paper feed stage, a holding member for holding the roll paper is a transparent member. An image forming apparatus, wherein the holding member has a remaining amount scale for visually confirming the remaining amount of paper of the roll paper, and has means for setting the confirmed remaining amount of paper and displaying means. And an image forming apparatus having means for setting the length of the roll paper.

According to a third aspect of the present invention, in the image forming apparatus according to the first or second aspect, the length of the paper fed from the paper feed stage is measured with respect to the set remaining amount of paper. An image forming apparatus having means for correcting the remaining amount of paper is provided.

[0007] The invention described in claim 4 is the invention according to claims 1 to 3.
In the image forming apparatus according to any one of the above, when the state of presence of paper is changed from a state of presence of paper to a state of detection of absence of paper by means for detecting presence / absence of paper in the paper feed stage, the remaining amount of paper is cleared. An image forming apparatus having means is provided.

[0008] The invention described in claim 5 is the invention according to claims 1 to 3.
In the image forming apparatus according to any one of the above, if the means for detecting the presence or absence of paper in the paper feed stage sets paper from a state where no paper is detected and changes to a state where paper is detected, An image forming apparatus having means for displaying a message for setting the remaining amount of paper is provided.

[0009]

FIG. 1 is a schematic view of an image forming apparatus showing one embodiment of the present invention, FIG. 2 is a schematic view of an operation section of the image forming apparatus, and FIG. FIG. 4 is a schematic view of an LCD display unit of the apparatus, and FIG. 4 shows a display state of a sub-screen when a sheet remaining amount setting key of FIG. 3 is pressed.
Is a schematic block diagram of the image forming apparatus of the present invention, and FIG.
FIG. 7 is a schematic block diagram of an image processing unit (IPU) 52 shown in FIG. 5, FIG. 7 is a schematic block diagram of an image processing unit 65 and an image memory controller MSU 66 shown in FIG.
FIG. 8 is an explanatory diagram of storing image data read by a scanner in a memory, FIG. 9 is an explanatory diagram of reading image data from an HDD 87 shown in FIG. 8, storing the image data in a memory, expanding, scaling, and outputting the image data. FIG. 10 is an explanatory diagram for explaining the concept of the roll paper holding member of the present invention.

FIG. 1 shows an image forming apparatus of the present invention. First, the outline of the image forming operation will be described. After setting the mode, when a document is set on the document table 12, the document is conveyed. The size of the original is detected by the sensor 127 during the conveyance of the original. Depending on the document size or the set mode,
Roll paper is fed from a paper feed roll 118, a paper feed roll 219, or a feed roll 3110.

The paper on the paper feed roll 118 is fed by a paper feed / conveyance roller 111 and an intermediate conveyance roller 116, cut by a roll cutter 114 to a predetermined length, and conveyed. Paper is also fed from the paper feed roll 219 by the paper feed transport roller 112 and the intermediate transport roller 116,
The sheet is conveyed after being cut into a predetermined length by a roll cutter 114 on the way. The paper feed roll 3110 is fed by a paper feed transport roller 113 and an intermediate transport roller 117, and is cut to a predetermined length by a roll cutter 115 and transported on the way.

The cut and conveyed sheet is the photosensitive member 1
The sheet is conveyed to a position where it contacts the sheet 20. Image data read by a scanner that reads a document image is written on the photoconductor 120 by a laser, and passes through a developing unit to form a toner image. Then, the toner image on the photoconductor 120 is transferred while the transfer paper is being conveyed at the same speed as the rotation of the photoconductor 120. Thereafter, the image is fixed by the fixing unit 122, and the discharge port switching unit 1
23, the sheet is discharged by a straight sheet discharge 125 or a reverse sheet discharge 124.

FIG. 2 is a diagram showing the operation unit. The operation unit includes a liquid crystal touch panel 21, a numeric keypad 22, an initial setting key 23, a clear / stop key 26, and a print key 2.
5, there is a mode clear key 24, the liquid crystal touch panel 2
1, each of the mode function keys 31 to 3, as shown in FIG.
9, 310 to 314, remaining paper amount setting key 315, number of copies setting keys 318, 319, magnification setting key 317, and a status display portion showing status displays 316, 323 of the image forming apparatus. A mode key operated to set or cancel each image forming mode is arranged.

FIG. 4 is a diagram showing the sub-screen LCD touch panel when the remaining paper amount setting key 315 in FIG. 3 is pressed, and 41 is pressed when it is desired to set the remaining paper amount of the tray 1. Select key, 4 for tray 2
2. In the case of tray 3, press 43. Reference numeral 44 denotes a remaining amount operation key which is pressed to set the remaining amount of paper in each tray in, for example, four levels when setting the remaining amount of the remaining amount. It is a key to set many. Reference numerals 46, 47, 48, and 49 denote remaining amount display units for displaying the remaining amount state, 410 denotes a paper thickness setting key for setting the thickness of roll paper to be set, and 411 denotes a roll paper length of the roll paper. It is a paper length setting key.

FIG. 5 shows a main controller (MCU) 5
FIG. 2 is a block diagram of a control device, with reference to FIG. The MCU 51 controls the entire image forming apparatus. MC
U51 includes a liquid crystal display unit 54 for displaying to the operator, an operation unit 53 for performing function setting input control from the operator, a control unit 57 of the scanner, a control for writing a document image in the image memory, and an image formation from the image memory. A distributed control device such as an image processing unit (IPU) 52 that performs control and the like and a paper folding unit 58 that is a post-processing control device is connected.

Each of the distributed control devices and the MCU 51 exchange machine status and operation commands as necessary. A main motor and various clutches necessary for paper conveyance and the like are also connected to the I / O board 56.
Is controlled by

With reference to FIG. 1, the operation of the image reading means of the present invention and the operation until a latent image is formed on a recording surface will be described. Here, the latent image is a potential distribution generated by converting an image into optical information and irradiating the image on the surface of the photoconductor 120. The scanner unit is a document set table 126
The original image is transferred to the C
It is read by a CD image sensor and converted into an electric signal for processing.

The writing unit is a part for writing a document image converted and processed into an electric signal on the photosensitive member 120 by the LED head as a condensed image. The polarized LED light is scanned in a direction (main scanning direction) orthogonal to the direction in which the photoconductor 120 rotates, and an image signal output from an image data selection 7B, which is a selector of an image processing unit shown in FIG. Is recorded in line units. By repeating main scanning at a predetermined cycle corresponding to the rotation speed and the recording density of the photoconductor 120, an image (electrostatic latent image) is formed on the surface of the photoconductor 120. As described above, the LED light output from the writing unit irradiates the photoconductor 120 of the image forming system. Although not shown, L of photoconductor 120
At a position irradiated by the ED head, a sensor for generating a main scanning synchronization signal is arranged. Control of image recording start timing in the main scanning direction based on the main scanning synchronization signal,
Further, a control signal for inputting / outputting an image signal described later is generated.

Image processing unit IPU in this embodiment
The configuration of 52 will be described with reference to FIG. The light emitted from the exposure lamp irradiates the document surface, and the reflected light from the document surface is imaged and received by an image forming lens (not shown) by the CCD image sensor 61, photoelectrically converted, and A / D-converted. The signal is converted into a digital signal by the converter 62. After the image signal converted into the digital signal is subjected to shading correction 63, the pre-image processing unit 64 performs filter correction, scaling data expansion, γ correction, and the like.

Further, in the image processing section 65, the destination of the image signal is switched to the image memory controller (MSU) 66 or the writing unit 610. Here, the image memory controller (MSU) 66 and the image processing unit 65 are configured to be able to bidirectionally input and output image signals. Although not specifically shown in FIG. 6, the image processing unit IPU 52 includes image data supplied from outside in addition to image data input from the CCD image sensor 61 as a reading unit (for example, a personal computer or the like). It has a function of selecting input and output of a plurality of data so that data output directly from the data processing device can be processed.

The setting to the image memory controller (MSU) 66 and the like, and the CCD image sensor 6 as a reading unit
1. a CPU 67 for controlling the writing unit 610;
ROM 69, R for storing the programs and data
AM68. Further, the CPU 67 can write and read data in the image memory 83 shown in FIG. 8 via the image memory controller (MSU) 66.

FIG. 7 is a block diagram for explaining the inside of the image processing section 65 in FIG. 6, and a scanner mask 71 for masking a read area when image data subjected to image processing by the previous image processing section 64 is read. If the color conversion is necessary according to the mode via the, the color conversion processing 72, the color erasure processing 73, the image bit inversion processing 74, the page, date, special characters, etc. print synthesis processing 75, the The image data is unconditionally stored in the image memory controller 7A.

The print core 76 is a device for creating a page for page printing, extracting character codes such as stamp characters, and generating print image data. ROM77,
The RAM 78 is involved in print control. The image data selection 7B outputs the image signals processed in the steps 71 to 75 directly to the image quality core 7C or transmits the image data from the image memory controller MSU7A to the image quality core 7C.
C, or output to the image quality core 7C image data synthesized by the MSU synthesis processing unit 79 that synthesizes an image from the image memory controller MSU7A with the image-processed image data.

The details of the configuration of the image memory controller MSU7A in FIG. 7 will be described with reference to FIG. The image memory controller MSU7A includes a primary compression unit 81 /
An image memory 83 comprising a DRAM, which is a storage memory for primary image data which has been primarily compressed and expanded by the primary expansion section 82.
(The image memory 83 has a bank A 84, a bank B8
5), a secondary compression / expansion unit 86, and a HDD (hard disk drive) 8 as a large-capacity memory.
7. A scaling unit 8 for changing the image magnification of the expanded registered image
8 blocks. The setting of control data in each block is performed by the CPU 67 shown in FIG.

That is, the image memory controller MSU7
A includes an image memory 83 and an HDD 87 as primary and secondary storage devices. In the image memory 83 as the primary storage device, writing data to a designated area or reading data from a designated area when outputting an image is substantially synchronized with a data transfer rate required when inputting / outputting image data. For example, a memory that can be accessed at high speed, such as a DRAM, is used. As an interface with the primary compression unit 81 / primary decompression unit 82 and the secondary compression / decompression unit 86 in the image memory controller MSU7A, the image memory 83 as a primary storage device stores the size of the image data to be processed. Thus, the area is divided into a plurality of areas (in this example, banks A 84 and B 85),
The input and output of the image data can be performed simultaneously.

The HDD 87 as a secondary storage device is a large-capacity memory for storing data for synthesizing and sorting input images. Similarly to the image memory 83 as the primary storage device, the HDD 87 as the secondary storage device can write / read data substantially in synchronization with the data transfer speed required at the time of image input / output. .

Next, an operation example of the image memory controller 7A will be described. [1] Image Input (Saving of Image Data to Image Memory 83) In FIG. 8, the image data 8V1 processed by the image processing unit up to the previous stage is unconditionally supplied to the MSU combination processing unit 7
9 is synthesized with the image data already stored in the image memory 83. MSU synthesis processing unit 79
Data 8V2 processed by the primary compression unit 8
After the data is compressed by the 1/1 primary decompression unit 82 and the compressed data is written to the image memory 83 as the primary storage device, and further compressed by the secondary compression / decompression unit 86,
The data is stored in the HDD 87 as a secondary storage device.

[2] Image Output (Reading of Image Data from Image Memory 83) In FIG. 9, at the time of image output, image data stored in the image memory 83 as a primary storage device is read. If the image data to be output is stored in the image memory 83 as the primary storage device, the primary compression unit 8
The 1/1 primary decompression unit 82 decompresses the image data in the image memory 83, which is the primary storage device, and stores the decompressed data or the data obtained by performing the image synthesis of the decompressed data and the input data. Output. At this time, the magnification of the expanded image can be changed by the scaling unit 88. MSU
The synthesis processing unit 79 includes an image memory 83 that is a primary storage device.
And the input image data 8V1 (having a function of adjusting the phase of the image data), selecting the output destination of the synthesized image data (image output, write-back to the primary storage device 83, Alternatively, simultaneous output to both output destinations is possible). If the image to be output is not stored in the image memory 83 as the primary storage device, the output target image data stored in the HDD 87 as the secondary storage device is converted by the secondary compression / decompression unit 86. After the data is expanded and the expanded data is written in the image memory 83 as the primary storage device, the above-described image output operation is performed.

Further, in the above-described mode setting for printing, a user can register an arbitrary stamp image as necessary. In the stamp image registration mode, the image from the scanner is registered in the HDD 87, which is the above-described secondary storage device, and later,
When the user selects a required stamp image, the stamp image data is stored in the HDD 8 as a secondary storage device.
7 and sent to the MSU combining processor 79 to be combined with the original image.

Originally, if the number of image formations is one for one document image, it is not necessary to store the image data in the image memory 83, but if the requested number of image formations is plural, In consideration of the fact that it is not necessary to scan every time, or even if a transfer paper jam or the like occurs, it is not necessary to read the original again. And HD
D87.

An embodiment of the present invention will be described with reference to FIG. FIG. 10A illustrates a roll paper, and the roll paper 1022 is a black paper core 102.
It is wrapped around 1. The width of the roll paper 1022 is 841
mm, 594 mm, 420 mm, etc., and the length is
There is a roll paper of 150 m or the like. FIG. 10B is a view of the roll paper 1022 viewed from the side, and the roll paper
A holding member 1023 holding the roll 22 is inserted into the hollow portion of the black paper tube 1021 from both ends of the roll paper 1022 as shown in FIG. 10C, and set on a tray as shown in FIG. I do. Holding member 1 for holding roll paper 1022
Since the holding member 1023 is formed of a transparent material when the roll paper 1022 is set on the roll paper 1022, when viewed from right beside when the roll paper 1022 is set as shown in FIG. The remaining amount of roll paper can be seen through. Holding member 1 for roll paper 1022
023, the roll paper 1022 as shown in FIG.
The scale is printed to check the remaining amount of the roll paper 1022 and set the remaining amount.
It can be confirmed by the scale. In the example of FIG. 10D, the roll paper 1022 is
5, the remaining amount of the roll paper 1022 is
It can be visually confirmed that the remaining amount is 3/4. In this example, the scale is divided into four, but there is no problem even if the division is further divided. When the remaining amount of the roll paper 1022 is visually observed as described above when the roll paper 1022 is set, the remaining amount is set by the operation unit after the roll paper 1022 is set on the tray.

This setting method is performed by pressing the paper remaining amount setting key 315 shown in FIG. 3 to open the child screen shown in FIG. If the roll paper is in Tray 1, Tray 1 4
By selecting 1 and pressing any one of the remaining amount operation keys 44 and 45, the remaining amount of roll paper visually observed is set. The remaining amount of roll paper can be visually checked and set as described above, but is not limited to roll paper, and paper has a paper thickness. Lengths vary. That is, since the length of the remaining amount of the roll paper differs depending on the paper thickness even if the remaining amount is set visually, a calculation method for controlling the remaining amount by measuring the transported length every time the image forming operation is performed. Will be different.

The relationship between the paper thickness and the remaining amount of paper is calculated in advance by an experiment, and the paper thickness can be set using the paper thickness setting key 410 and the ten keys 22. Also,
When setting a new roll paper, the roll paper always contains the roll paper length. By setting this roll paper length with the paper length setting key 411 and the numeric keypad 22, a more accurate roll paper length can be set. Remaining amount control can be performed.

The set remaining amount is determined by the setting key 412, and when all the operations relating to the tray of the desired remaining amount are completed, the end key 413 is pressed to return to the basic screen of FIG. I can do it. Then, the previously set remaining amount is displayed at 320, 321, 322. As described above, when the roll paper is replaced, at the time of setting the roll paper, the remaining amount of the roll paper is checked by the remaining amount scale printed on the holding member 1023 through the holding member 1023. , Can be displayed on the operation display unit.
Conversely, when the roll paper is replaced, if the remaining amount is not set, the remaining amount before replacement may be displayed. Since the end of paper is detected, a warning message for setting the remaining amount of roll paper is displayed on the status display unit 323 by detecting the paper end, thereby preventing forgetting to set the remaining amount of roll paper. I can do it.

After setting the remaining amount of roll paper, the length of roll paper fed for each tray is cumulatively calculated in order to feed the required length of roll paper from the selected tray. Can control the remaining amount. For example, if the remaining amount FULL is 150 m, the remaining amount of 3/4 is 11
The length is 2.5 m, and in the case of A3 paper length, it can be calculated that 267 sheets can be copied. A3 paper length (length, 4
20 mm), the remaining amount when 100 sheets are copied continuously is 70.5 m, and the remaining amount display is 2/4 in the case of 4 divisions.
Is displayed, and the remaining amount is reduced by one scale.
As described above, by using the transparent member for the roll paper holding member 1023, the remaining amount of the roll paper can be visually checked, so that the remaining amount of the roll paper can be easily controlled at low cost. It becomes possible.

[0036]

According to the first aspect of the present invention, there is provided an image forming apparatus using roll paper, wherein when the roll paper is set in a paper feed stage, a holding member for holding the roll paper is a transparent member. In the image forming apparatus, the holding member has a remaining amount scale for visually confirming the remaining amount of paper of the roll paper, and a unit for setting the confirmed remaining amount of paper, and a displaying unit. Since there is a means for setting the thickness of the roll paper, the remaining amount of the roll paper can be determined even for roll papers having different thicknesses.

(2) An image forming apparatus using roll paper, wherein when the roll paper is set in the paper feed stage, the holding member for holding the roll paper is a transparent member. In the image forming apparatus, the holding member is provided with a remaining amount scale for visually confirming the remaining amount of roll paper on the holding member, and a unit for setting the confirmed remaining amount of paper and a displaying unit. Has a means for setting the length of the sheet, so that the remaining amount of the sheet can be detected with higher accuracy when setting a new roll sheet.

(3) Action and Effect Corresponding to Claim 3 In the image forming apparatus according to claim 1 or 2, the length of the paper fed from the paper feed stage is measured with respect to the set remaining amount of paper. Since the remaining amount of paper is corrected, it is possible to control the remaining amount of paper without the need for detecting the remaining amount of paper.

(4) Action and Effect Corresponding to Claim 4 In the image forming apparatus according to any one of claims 1 to 3, the means for detecting the presence / absence of paper in a paper feed stage changes the state of presence of paper. If the state changes to the state where no paper is detected,
Since the remaining amount of paper is cleared, errors in the remaining amount of paper can be absorbed.

(5) Action and Effect Corresponding to Claim 5 In the image forming apparatus according to any one of claims 1 to 3, the absence of paper is detected by the means for detecting the presence or absence of paper in the paper feed stage. When the sheet is set from the state and the state changes to the state where the presence of the sheet is detected, a message for setting the remaining amount of the sheet is displayed. Therefore, it is possible to prevent forgetting to set the remaining amount of the sheet when the sheet is replaced.

[Brief description of the drawings]

FIG. 1 is a schematic view of an image forming apparatus showing one embodiment of the present invention.

FIG. 2 is a schematic view of an operation unit of the image forming apparatus shown in FIG.

FIG. 3 is a schematic diagram of an LCD display unit of the image forming apparatus shown in FIG.

FIG. 4 is a diagram showing a display state of a child screen when a sheet remaining amount setting key in FIG. 3 is pressed.

FIG. 5 is a schematic block diagram of the image forming apparatus of the present invention.

FIG. 6 is a schematic block diagram of an image processing unit (IPU) shown in FIG.

7 is a schematic block diagram of the image processing unit shown in FIG. 6 and an image memory controller MSU.

FIG. 8 is an explanatory diagram of storing image data read by a scanner in a memory.

FIG. 9 is an explanatory diagram for reading image data from the HDD shown in FIG. 8, storing the image data in a memory, and expanding and scaling the image data before outputting.

FIG. 10 is an explanatory diagram for explaining the concept of the roll paper holding member of the present invention.

[Explanation of symbols]

Reference numeral 12: platen, 18: feeding rolls 1, 19 ... feeding rolls 2, 21: liquid crystal touch panel, 22: numeric keypad, 23 ...
Initial setting key, 24: mode clear key, 25: print key, 26: clear / stop key, 31 to 39 ...
Each mode function key, 41, 42, 43 ... selection key, 4
4, 45 ... remaining amount operation keys, 46, 47, 48, 49 ... remaining amount display unit, 51 ... MCU, 52 ... image processing unit (I
PU), 53 ... operation unit, 54 ... liquid crystal display unit, 56 ... I /
O board, 57: scanner control unit, 58: paper folding unit, 6
1: CCD image sensor, 62: A / D converter,
63: shading correction, 64: previous image processing unit, 65
... Image processing unit, 66 ... Image memory controller (MS)
U), 67: CPU, 68: RAM, 69: ROM, 7
DESCRIPTION OF SYMBOLS 1 ... Scanner mask, 72 ... Color conversion processing, 73 ... Color erasure processing, 74 ... Image bit inversion processing, 75 ... Print synthesis processing, 76 ... Print core, 77 ... ROM, 78 ... RAM, 7
9 MSU synthesis processing unit, 7A image memory controller, 7B image data selection, 7C image quality core, 81 1
Next compression section, 82 Primary expansion section, 83 Image memory, 84
... Bank A, 85 ... Bank B, 86 ... Secondary compression / decompression unit
87 HDD, 88 magnification unit, 110 feed roll 3,
111: paper feed roller, 112: paper feed roller, 1
13: paper feed roller, 114: roll cutter, 115
... Roll cutter, 116 ... Intermediate transport roller, 117 ... Intermediate transport roller, 120 ... Photoconductor, 122 ... Fixing unit, 123 ... Paper discharge port switching section, 124 ... Reverse paper discharge, 1
25: straight sheet discharge, 126: original set table, 127: sensor, 310 to 314: each mode function key, 315: paper remaining amount setting key, 316: status display, 317: magnification setting key, 318, 319: number of copies setting Key, 320, 32
1,322: remaining amount display, 410: paper thickness setting key, 323
... Status display section, 410: Paper thickness setting key, 411: Paper length setting key, 412: Setting key, 413: End key, 414
... Status display section, 610 ... Write unit, 8V1,8
V2: image data, 1021: paper tube, 1022: roll paper, 1023: holding member, 1024, 1024, 102
6,1027 ... Remaining scale.

Claims (5)

[Claims] 1. An image forming apparatus using roll paper, wherein when the roll paper is set in a paper feed stage, a holding member for holding the roll paper is formed of a transparent member, and the holding member is A means for visually confirming the remaining amount of paper of the roll paper, a means for setting the confirmed remaining amount of paper;
An image forming apparatus comprising: means for setting a paper thickness of the roll paper. 2. An image forming apparatus using roll paper, wherein when the roll paper is set in a paper feed stage, a holding member for holding the roll paper is formed of a transparent member, and the holding member is A means for visually confirming the remaining amount of paper of the roll paper, a means for setting the confirmed remaining amount of paper,
An image forming apparatus having means for displaying, wherein the means for setting the length of the roll paper is provided. 3. The image forming apparatus according to claim 1, wherein the length of the paper fed from the paper feed stage is measured with respect to the set remaining amount of paper, and the remaining amount of paper is corrected. An image forming apparatus comprising: 4. An image forming apparatus according to claim 1, wherein said means for detecting the presence or absence of paper in said paper feed stage changes from a state of presence of paper to a state of detecting absence of paper. An image forming apparatus having means for clearing the remaining amount of the sheet when the image forming apparatus performs the operation. 5. The image forming apparatus according to claim 1, wherein the sheet is set in a state where the absence of the sheet is detected by the means for detecting the presence or absence of the sheet in the sheet supply stage. An image forming apparatus comprising: means for displaying a message for setting the remaining amount of paper when the state changes to a state where presence is detected.