JP2004217356A - Roll end detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device capable of preventing the generation of damage of a rolled paper surface by controlling a driving means for a disk to start drive when the disk reaches a part just in front of a paper tube of the rolled paper to turn the disk with the rolled paper, and capable of displaying residual quantity or a near end of the rolled paper, while restricting the power at the minimum. <P>SOLUTION: This image forming device has a roll end detecting device provided with the driving means for making the disk 10 having a claw-like circumferential surface abut on the rolled paper 1 to rotate the disk 10 at a constant speed V faster than a constant speed V<SB>0</SB>of the paper tube 2 of the rolled paper 1 (V>V<SB>0</SB>) and provided with a detecting means for detecting unevenness of rotation of the disk 10. In this image forming device, the driving means for the disk 10 starts the drive when the disk 10 reaches a part just in front of the paper tube of the rolled paper 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００１８】
図９に示すように、支点３０を中心に回転するリンク５０に弾性部材５１がかかり、分離円盤１０にロール紙１が押圧すると、弾性部材５１が伸び、分離円盤１０が退避していく。
【００１９】
【発明の効果】
以上説明したように、本発明に係るロールエンド検知装置によれば、円盤がロール紙の紙管直前に到達して駆動を開始するよう円盤の駆動手段を制御するので、円盤をロール紙に連れ回りさせ、ロール紙表面のダメージを防ぎ、電力を最小限に抑えることができる。
また、本発明に係るロールエンド検知装置によれば、ロール紙の紙管に対する円盤の位置を検知する検知手段を設け、ロール紙の残量またはニヤエンドを表示、警告するので、ロール紙の交換時期を適切に促すことができる。
また、本発明に係るロールエンド検知装置によれば、ロール紙のセット方向に対し、退避可能な移動手段を設けたので、ロール紙セット時にロール紙よるロールエンド検知手段の破損を防止することができる。
【図面の簡単な説明】
【図１】本発明の画像形成装置の構成を示す概略図である。
【図２】ロール紙に分離円盤を当接した状態を示す概略図である。
【図３】ロール紙に分離円盤を当接した部分を拡大した概略図である。
【図４】分離円盤がロール紙と連れ周りしている状態を示す概略図である。
【図５】分離円盤が少なくなったロール紙と連れ周りしている状態を示す概略図である。
【図６】分離円盤が少なくなったロール紙と連れ周りして、ロールエンドを検知する状態を示す概略図である。
【図７】分離円盤が少なくなったロール紙と連れ周りして、ロールエンドを検知手段で検知する状態を示す概略図である。
【図８】図７における検知手段によりロール紙の残量を検知する状態を示す概略図である。
【図９】分離円盤が少なくなったロール紙と連れ周りして、ロールエンドを移動手段で検知する状態を示す概略図である。
【符号の説明】
１ ロール紙
２ 紙管
３ 最終端
１０ 分離円盤
１２ 支点
１３ ギア
１４ 駆動ギア
１５、１６、１７ プーリ
１８ ベルト
３０ 支点
３１ モータギア
３２ ギア
３３、３４ プーリ
３５ ベルト
４０ 遮蔽板
４１、４２ センサ
５０ リンク
５１ 弾性部材
１００ 給紙部
１０１、１０２ ロール紙トレイ
１０３〜１０６ ロール紙
１０７〜１１０ ペーパーホルダ
１１１〜１１４ 給紙ローラ
１１５、１１６ ロールカッターユニット
２００ 画像形成部
２０１ 作像部
２０２ 定着部
２０３ 排紙部
２０４ ＬＥＤ書込装置
２０５ 感光体
２０６、２０７ 排紙トレイ
２０８ レジストローラ
２０９ 転写部
２１０ 分離部
２１１ 搬送ベルト
２１２、２１３ 排紙ローラ
２１４ 分離爪
２１５、２１６ 排紙センサー
３００ 読取部
３０１ 原稿台
３０２ 密着イメージセンサー
３０３ 給紙ローラ
３０４ 搬送ローラ
３０５ 排紙ローラ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image forming apparatus for an electrostatic copying process such as a copying machine, a facsimile, a printer, and the like. More specifically, the present invention relates to an image forming apparatus having a roll end detecting device for detecting a rear end of roll paper on which an image is formed.
[0002]
[Prior art]
In a conventional image forming apparatus using roll paper, a roll end detecting device for detecting that the roll paper has run out as a result of the consumption of the roll paper uses a reflection-type color of the roll paper core that appears when the roll paper is consumed. The detection is performed by the sensor, but when the paper core is a white paper core, the surface of the paper core may be erroneously detected as roll paper. Further, the rear end of the roll paper comes off the paper tube, and the rear end of the roll paper is detected by a reflection type sensor or a photo interrupter with a filler during paper conveyance.
[0003]
For example, in Patent Literature 1, a pattern written on the back surface of a roll paper is detected using reflected light, and the remaining amount of the roll paper is recognized. First, a reflected light detecting unit is installed at a position where a pattern written on the roll paper passes at certain intervals. Then, there is a moment when the pattern passes on the optical path of the reflection sensor during paper feeding. When this pattern passes, the data of the reflection type sensor is input to the I / O control unit with a constant waveform. The I / O control unit detects the interval at which the data is black and counts the number of write lines of the plotter by a method of counting the number of rotation clocks of the motor, a method of sending a signal to the CPU every time the data level is switched, and the like. A paper feeding device for detecting the remaining amount of roll paper is disclosed. Thus, the remaining amount of the roll paper can be accurately and easily known, and the roll paper can be used efficiently and the usability can be improved.
Further, in Japanese Patent Application Laid-Open No. H11-157, the light receiving sensor is caused to follow the end of the roll paper by determining whether the roll is smaller or larger than the threshold value, and the rotation angle is detected by an angle detector, and the roll remaining amount is detected. And a roll paper remaining amount and end detection device for determining when the light emitting and receiving sensor hits the black portion of the surface of the roll paper tube and the received light voltage does not become larger than the threshold value is determined to be a roll end. Thus, the remaining amount of roll paper can be detected using the roll paper end detection device.
[0004]
However, if the rear end of the roll paper is adhered and fixed to the paper core, the roll paper transport means (transport roller) transports the roll paper together with the paper core, and the paper core may damage peripheral members. Failure occurs. Therefore, regardless of the fixed state of each colored paper tube and the rear end of the roll paper, by detecting the rotation unevenness that occurs when the rotating disk comes into contact with the roll paper and the rear end of the roll paper is turned on the circumference of the disk, 2. Description of the Related Art Roll end detection devices that detect a rear end are known. This is because the disk detects the roll end and contacts the roll paper while rotating faster than the peripheral speed of the roll paper, which always applies a load to the roll paper when the disk abuts. There is a possibility that a mark is formed by the disk, and an abnormal image such as a transfer omission due to the mark may occur. Further, since power is always applied to the disk, wasteful power is required, and it is difficult to reduce the running cost of the image forming apparatus.
[0005]
[Patent Document 1]
JP 09-278244 A [Patent Document 2]
JP 09-290951 A
[Problems to be solved by the invention]
Therefore, the present invention controls the drive means of the disk so that the disk arrives just before the roll paper core and starts driving, thereby causing the disk to follow the roll paper, preventing damage to the roll paper surface, An object of the present invention is to provide an image forming apparatus that displays the remaining amount of roll paper or the near end while minimizing electric power.
In addition, a roll end detecting unit is provided with a detecting unit for detecting the position of the disk with respect to the paper tube of the roll paper, and the image forming apparatus which prompts the time to replace the roll paper by displaying and warning the remaining amount of the roll paper or the near end is provided. The task is to provide.
Further, an image forming apparatus is provided in which a moving means capable of retracting in the roll paper setting direction by the roll end detecting means is provided, thereby preventing the roll end detecting means from being damaged by the roll paper when setting the roll paper. Make it an issue.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 provides a paper feeding unit for mounting and feeding roll paper, and a cutting unit for cutting the roll paper sent from the paper feeding unit according to the length. Image forming means for forming an image on the cut roll paper, fixing means for fixing the image formed by the image forming means to the roll paper, and discharge means for discharging the roll paper fixed by the fixing means, And a stack portion on which the discharged roll paper is stacked, and a disk having a claw-shaped peripheral surface is brought into contact with the roll paper, and the peripheral speed V of the disk is higher than the peripheral speed V ₀ of the paper tube of the roll paper (V > V ₀ ) In an image forming apparatus having a roll end detecting device provided with a driving unit for rotating and a detecting unit for detecting rotation unevenness of the disc, the image forming apparatus comprises: a driving unit for the disc; Drive is opened just before reaching the paper core. An image forming apparatus.
According to a second aspect of the present invention, there is provided a paper feeding unit for mounting and feeding roll paper, a cutting unit for cutting the roll paper sent from the paper feeding unit in accordance with a length, and a cutting unit for cutting the roll paper. Image forming means for forming an image, fixing means for fixing the image formed by the image forming means to roll paper, discharging means for discharging the roll paper fixed by the fixing means, and loading the discharged roll paper A driving unit for rotating the disk so that the peripheral speed V of the disk is rotated faster (V> V ₀ ) than the peripheral speed V ₀ of the paper tube of the roll paper. And an image forming apparatus having a roll end detecting device provided with a detecting means for detecting rotation unevenness of the disc, wherein the image forming apparatus includes a position detecting means for detecting a position of the disc with respect to the paper tube of the roll paper. Device.
According to a third aspect of the present invention, there is provided a paper feeding unit for mounting and feeding roll paper, a cutting unit for cutting the roll paper sent from the paper feeding unit according to a length, and a cutting unit for cutting the roll paper. Image forming means for forming an image, fixing means for fixing the image formed by the image forming means to roll paper, discharging means for discharging the roll paper fixed by the fixing means, and loading the discharged roll paper A driving unit for rotating the disk so that the peripheral speed V of the disk is rotated faster (V> V ₀ ) than the peripheral speed V ₀ of the paper tube of the roll paper. And an image forming apparatus having a roll end detecting device provided with a detecting means for detecting the rotation unevenness of the disk, wherein the image forming apparatus is provided with moving means capable of retracting in the setting direction of the roll paper. is there.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
With reference to FIG. 1, the configuration of a wide digital copying machine according to an embodiment of the image forming apparatus of the present invention will be described.
In this figure, an image forming unit 200 is mounted on a paper feeding unit 100, and a reading unit (scanner unit) 300 is mounted on the image forming unit 200, thereby constituting an image forming apparatus as a whole.
[0009]
Documents placed on a document table 301 of the reading unit 300 are fed one by one to the reading unit 300, and are discharged onto a discharge tray after reading an image by a contact image sensor (CIS) 302. I have. The document on the document table 301 is aligned in the width direction by a side fence (not shown), fed by a feed roller 303, and conveyed below the contact image sensor 302. An original width detection sensor and an original length detection sensor are provided on the original platen 301. Both sensors detect the size of the document sent from the document table 301. The original under the contact image sensor 302 is exposed by a light source such as an LED array or a fluorescent lamp, and the reflected light passes through a rod lens array to form an image on the image sensor to perform photoelectric conversion. After the reading of the original is completed, the original is discharged onto a discharge tray by the transport roller 304 and the discharge roller 305.
[0010]
The image forming unit 200 has an image forming unit 201, a fixing unit 202, and a paper discharging unit 203. The image signal read by the contact image sensor 302 is subjected to image processing, and is processed by the LED writing unit 204 by a charger. An electrostatic latent image is formed on the photoconductor 205 charged in the same manner. The original image is copied onto the recording paper fed from the paper feeding unit 100, and the paper passes through the paper discharging unit 203 and is discharged from the upper surface of the image forming unit 200 or the paper discharge trays 206 and 207 behind the image forming unit 200. To be discharged.
[0011]
The paper feeding unit 100 has two upper and lower roll paper trays 101 and 102. The roll paper trays 101 and 102 can be pulled out to the left in the drawing from the apparatus housing, and are configured to perform roll paper setting and jam processing with the tray pulled out. Two roll papers can be set on the roll paper trays 101 and 102, respectively. The roll papers 103 to 106 wound around the paper tube are set in the paper feeding unit 100 via a pair of paper holders 107 to 110. Paper feed rollers 111 to 114 for each roll paper are arranged near the roll paper. The roll paper sent out by each of the paper feed rollers 111 to 114 is cut into a predetermined length by roll cutter units 115 and 116 provided on the front side of the tray (left side in the drawing), and sent to the image forming unit 200. . The cut and fed roll paper is synchronized with the image forming timing by the registration roller 208, guided to the photoconductor 205, and the image formed on the photoconductor 205 is transferred by the transfer unit 209 and separated. The image is separated from the photoconductor 205 by the unit 210 and guided to the fixing unit 202 by the conveyor belt 211, and the image is thermally fixed. The roll paper on which the image is fixed is discharged by discharge rollers 212 and 213 forming a discharge unit 203. The paper discharge direction is switched by the branch claw 214, and the discharge tray 206 on the upper surface of the image forming unit 200 or the paper discharge tray 207 behind the image forming unit 200 is used.
[0012]
Paper discharge sensors 215 and 216 are provided between the fixing unit 202 and the paper discharge roller 212 and between the paper discharge roller 212 and the paper discharge roller 213. Roll paper is discharged by the paper discharge sensors 215 and 216. It is possible to determine whether or not it is in the unit 203.
Although not shown, the image forming unit 200 includes a drive control unit that drives the discharge rollers 212 and 213, and the reading unit 300 includes an operation start instruction and repeat information that is information on roll paper to be conveyed. An operation unit for inputting copy and long sheet passing information is provided.
[0013]
As shown in FIG. 2 or 3, a separation disk 10 (turning disk) is brought into contact with the roll paper 1. The separation disc 10 peripheral surface has an uneven shape such as the separation claw 11, the peripheral velocity (V) is, the peripheral speed of the paper tube 2 of the roll paper 1 greet roll end of the separation disk 10 (V ₀ And (V ₀ <V). When the roll paper 1 reaches the roll end, the final end 3 of the roll paper 1 reaches the separation disk 10 and the separation disk 10 that is faster than the peripheral speed (V ₀ ) of the paper tube 2 of the roll paper 1 The final end 3 of the roll paper 1 is turned up by the separating claw 11.
At this time, the separation disk 10 receives resistance due to the rolled-up roll paper, and cannot rotate at a constant speed due to the resistance load (rotation unevenness occurs). If the driving means of the separation disk 10 is a motor, the rotation unevenness is detected by detecting an overcurrent of the motor, and the separation disk 10 or a member (belt, gear, pulley, etc.) for driving the separation disk 10 is driven. The roll end is detected by detecting unevenness with an encoder or the like.
[0014]
As shown in FIG. 4, the separation disk 10 rotates with the roll paper 1 (V ₀ ≧ V) in contact with the roll paper 1, and as shown in FIG. In the contact state, the roll paper 1 approaches the paper tube 2 of the roll paper 1 while rotating about the fulcrum 12 while using the roll paper 1. The gear 13 having the fulcrum 12 is connected to the driving gear 14 when the separation disk 10 reaches just before the paper tube 2, and pulleys 15, 16, 17 which are coaxial with the separation disk 10, the fulcrum 12 and the gear 13. , The peripheral speed (V) of the separation disk 10 reaches V ₀ <V, and the roll end is detected.
[0015]
Further, as shown in FIG. 6, the separation disk 10 approaches the paper tube 2 of the roll paper 1 while rotating around the fulcrum 30 with the use of the roll paper 1 in a state of being in contact with the roll paper 1. The rotation is controlled by a drive motor, and the drive motor is driven immediately before the paper tube 2 of the roll paper 1 to drive a coaxial gear 32 of a fulcrum 30 connected to a motor gear 31 coaxial with the drive motor, thereby separating the disc. 10, the belt 35 connecting the pulleys 33 and 34 coaxially with the fulcrum 30 causes the separation disk 10 to reach a peripheral speed (V) of V ₀ <V and detect a roll end.
As shown in FIG. 7, the shielding plate 40 rotating about the fulcrum 30 is detected by detecting means (sensors) 41 and 42, and the position of the separation disk 10 with respect to the paper tube 2 of the roll paper 1 is determined.
[0016]
As shown in FIG. 8 and Table 1, the remaining amount of the roll paper 1 is 80% to 100%, 40% to 80%, and 20% to 40 depending on the combination of four types of the detection means (sensors) 41 and 42. %, And a near end is indicated on the operation panel, a warning is issued, and the time for replacing the roll paper 1 is instructed.
[0017]
[Table 1]

[0018]
As shown in FIG. 9, when the elastic member 51 is applied to the link 50 that rotates about the fulcrum 30 and the roll paper 1 is pressed against the separation disk 10, the elastic member 51 extends and the separation disk 10 retreats.
[0019]
【The invention's effect】
As described above, according to the roll end detection device of the present invention, the drive means of the disk is controlled so that the disk arrives just before the paper tube of the roll paper and starts driving. It can be rotated to prevent damage to the roll paper surface and minimize power consumption.
Further, according to the roll end detecting device of the present invention, the detecting means for detecting the position of the disk with respect to the paper tube of the roll paper is provided, and the remaining amount of the roll paper or the near end is displayed and warned. Can be appropriately encouraged.
Further, according to the roll end detecting device of the present invention, since the moving means capable of retracting in the setting direction of the roll paper is provided, it is possible to prevent the roll end detecting means from being damaged by the roll paper when setting the roll paper. it can.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a configuration of an image forming apparatus of the present invention.
FIG. 2 is a schematic diagram showing a state in which a separation disk is in contact with roll paper.
FIG. 3 is an enlarged schematic view of a portion where a separation disk abuts on roll paper.
FIG. 4 is a schematic view showing a state where a separation disk is entrained with roll paper.
FIG. 5 is a schematic diagram showing a state in which the separation disk is entrained with the rolled paper having been reduced.
FIG. 6 is a schematic diagram showing a state in which the separation end disk is rotated together with the reduced roll paper to detect a roll end.
FIG. 7 is a schematic diagram illustrating a state in which the separation disk is rotated together with the reduced roll paper and the roll end is detected by the detection unit.
8 is a schematic diagram showing a state in which the detection means in FIG. 7 detects the remaining amount of roll paper.
FIG. 9 is a schematic diagram showing a state in which the separation end disk rotates together with the reduced roll paper and the roll end is detected by the moving means.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 roll paper 2 paper core 3 final end 10 separation disk 12 fulcrum 13 gear 14 drive gears 15, 16, 17 pulley 18 belt 30 fulcrum 31 motor gear 32 gears 33, 34 pulley 35 belt 40 shielding plates 41, 42 sensor 50 link 51 elasticity Member 100 Paper feed unit 101, 102 Roll paper tray 103-106 Roll paper 107-110 Paper holder 111-114 Paper feed roller 115, 116 Roll cutter unit 200 Image forming unit 201 Image forming unit 202 Fixing unit 203 Paper discharge unit 204 LED Writing device 205 Photoconductors 206, 207 Ejection tray 208 Registration roller 209 Transfer unit 210 Separation unit 211 Conveyor belt 212, 213 Ejection roller 214 Separation claw 215, 216 Ejection sensor 300 Reading unit 301 Original table 302 Close contact image sensor 303 Salary Rollers 304 transport rollers 305 discharge roller

Claims (3)

A paper feed unit for loading and feeding roll paper,
Cutting means for cutting the roll paper sent from the paper feeding unit according to the length,
Image forming means for forming an image on the cut roll paper;
Fixing means for fixing the image formed by the image forming means on roll paper;
Discharging means for discharging the roll paper fixed by the fixing means,
A stack section for loading the discharged roll paper,
A drive means for abutting a disk having a claw-shaped peripheral surface on the roll paper and rotating the disk at a peripheral speed V higher than the peripheral speed V ₀ of the paper tube of the roll paper (V> V ₀ );
In an image forming apparatus having a roll end detection device provided with a detection unit for detecting rotation unevenness of a disc,
The image forming apparatus is characterized in that the disk driving means starts driving when the disk reaches just before the roll paper roll paper tube. A paper feed unit for loading and feeding roll paper,
Cutting means for cutting the roll paper sent from the paper feeding unit according to the length,
Image forming means for forming an image on the cut roll paper;
Fixing means for fixing the image formed by the image forming means on roll paper;
Discharging means for discharging the roll paper fixed by the fixing means,
A stack section for loading the discharged roll paper,
A drive means for abutting a disk having a claw-shaped peripheral surface on the roll paper and rotating the disk at a peripheral speed V higher than the peripheral speed V ₀ of the paper tube of the roll paper (V> V ₀ );
In an image forming apparatus having a roll end detection device provided with a detection unit for detecting rotation unevenness of a disc,
The image forming apparatus further includes a position detecting unit that detects a position of the disk with respect to the paper tube of the roll paper. A paper feed unit for loading and feeding roll paper,
Cutting means for cutting the roll paper sent from the paper feeding unit according to the length,
Image forming means for forming an image on the cut roll paper;
Fixing means for fixing the image formed by the image forming means on roll paper;
Discharging means for discharging the roll paper fixed by the fixing means,
A stack section for loading the discharged roll paper,
A drive means for abutting a disk having a claw-shaped peripheral surface on the roll paper and rotating the disk at a peripheral speed V higher than the peripheral speed V ₀ of the paper tube of the roll paper (V> V ₀ );
In an image forming apparatus having a roll end detection device provided with a detection unit for detecting rotation unevenness of a disc,
The image forming apparatus is provided with a moving unit capable of retreating in a setting direction of the roll paper.

Images