JP2002362782A - Image forming device - Google Patents

Image forming device

Info

Publication number
JP2002362782A
JP2002362782A JP2001171953A JP2001171953A JP2002362782A JP 2002362782 A JP2002362782 A JP 2002362782A JP 2001171953 A JP2001171953 A JP 2001171953A JP 2001171953 A JP2001171953 A JP 2001171953A JP 2002362782 A JP2002362782 A JP 2002362782A
Authority
JP
Japan
Prior art keywords
paper
image forming
long
supply path
long paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2001171953A
Other languages
Japanese (ja)
Other versions
JP3714888B2 (en
Inventor
Kiyonori Yamamoto
清典 山本
Original Assignee
Kyocera Mita Corp
京セラミタ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Mita Corp, 京セラミタ株式会社 filed Critical Kyocera Mita Corp
Priority to JP2001171953A priority Critical patent/JP3714888B2/en
Publication of JP2002362782A publication Critical patent/JP2002362782A/en
Application granted granted Critical
Publication of JP3714888B2 publication Critical patent/JP3714888B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device capable of preventing a trouble such that the long paper is caught or interfered by parts arranged on positions beyond the width of a feeding passage. SOLUTION: A pair of skew detecting sensors 81, 82 for detecting the skew of the long paper 17 are mounted at both side parts of the feed passage 80 of the long paper 17 between a paper feed roller 26 and a pair of registration rollers 36, 37. When a side edge of the long paper 17 is fed in the feeding direction F over the width W of the feeding passage 80, the skew detecting sensors 81, 82 react on the side edge of the long paper 17, and the driving of the device is immediately stopped by the reaction.

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 in which a long sheet longer than a regular sheet cut to a predetermined size is supplied to perform an image forming process.

[0002]

2. Description of the Related Art Conventionally, fixed-size paper, small-size postcards, envelopes, and the like have been mainly used in image forming apparatuses such as copying machines and printers. Paper is increasingly being used.

Incidentally, a general image forming apparatus is designed such that the width of a paper supply path is determined according to the maximum width of the paper to be used. In other words, the width dimension of the supply path is wider than the maximum width of the paper so that trouble such as JAM (paper jam) does not occur even if the paper having the maximum width is supplied. For example, it is sufficient for the standard paper to be wider by about 30 to 40 mm (15 to 20 mm on one side with respect to the center of the width) in consideration of the compactness of the apparatus.

[0004]

However, the situation is different when long paper is used. This situation will be described below with reference to FIG. FIG. 7 illustrates a state in which the long paper is supplied obliquely to the supply path (hereinafter, may be referred to as “skew”). Reference numeral 110 denotes a typical transport roller provided on the supply path 120 and configured to transport the long paper 115, and has a cylindrical roller pad 111 and shaft portions 112, 112 at both ends thereof. This transport roller 110
Is a pair of bearings 11 provided on the shaft portions 112, 112.
It is rotatably attached to an apparatus main body (not shown) via the reference numerals 3 and 113. Reference numeral 114 denotes a gear for rotating the transport roller 110, which is fixed to one shaft 112 and connected to a drive mechanism (not shown). Although not shown, outside the supply path 120,
There is a supporting member for supporting the first member 0 and a member protruding toward the supply path 120. For example, if a cutter (not shown) that cuts the long paper 115 in the width direction across the supply path 120 is provided, the supply of the long paper 115 is performed near the downstream side of the cutter in the supply direction F of the long paper 115. There are often members that protrude toward the path 120.

Now, the width W of the supply path 120 is
11, the long paper 115 is supplied obliquely. Since the long paper 115 is long in the supply direction F, once the supply of the long paper 115 proceeds obliquely, the degree of exceeding the width W area of the supply path 120 increases toward the rear end. Go. Then, the side edge portion of the long sheet 115 that exceeds the area of the width W of the supply path 120 is bitten by the bearing 113 or the gear 114, a supporting member that supports the transport roller 110, or the supply path 1.
A trouble may occur due to interference with a member protruding toward 20.

As described above, in the case of long paper, even if the skew is small enough to cause no trouble with regular paper, the paper such as a bearing or a gear disposed at a position beyond the width of the supply path may be used. Troubles, such as biting, are likely to occur. In addition, since the paper caught in the bearings and gears is particularly difficult to remove, the paper often breaks when removing the paper. If the torn paper remains inside the apparatus, the paper is re-used. May cause trouble or damage when activated. To prevent such a problem, it is easily conceivable to set the width of the supply path to be wider. However, it is necessary to increase the size of the apparatus, and furthermore, for a member that projects toward the supply path. Is not a good idea as it gets worse.

In view of the above, the present invention has been made in view of the above-described problems, and has a problem that a long paper may bite or interfere with a component disposed at a position beyond the width of a supply path. It is an object of the present invention to provide an image forming apparatus capable of preventing the above problem.

[0008]

In order to achieve the above object, an image forming apparatus according to the present invention is configured such that a long sheet longer than a standard sheet is supplied to perform an image forming process. A sensor that responds when supplied beyond a region defined in the width direction at a predetermined position of the supply path, and control means that controls so that driving of the device stops when the sensor reacts. .

Further, from the viewpoint of increasing the reliability of detection by the sensor, it is preferable that the sensor is provided on both sides of the supply path and reacts to the side edge of the long sheet exceeding the area.

Further, for the purpose of detecting the skew of the long paper at an early stage, for example, a feeding means for feeding the long paper toward an image forming section where an image forming process is performed is provided in a supply path, The sensor may be provided upstream of the delivery means with respect to the supply path.

Further, if there is a member that protrudes toward the supply path even outside the supply path, it interferes with the member when the long paper is skewed. It is preferable that a protruding member that protrudes toward the supply path be provided outside the supply path, and the sensor be provided near the upstream side of the protruding member with respect to the supply path.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are external perspective views of an image forming apparatus according to an embodiment of the present invention, FIG. 3 is a longitudinal sectional view of a main part of the image forming apparatus according to the embodiment, and FIG. 4 shows a setting procedure of a long paper mode. FIG. 5 is a flowchart showing the arrangement of sensors for detecting skew of long paper, and FIG. 6 is a view of FIG. 5 viewed from below.

This image forming apparatus is a copying machine. In FIGS. 1 and 2, reference numeral 1 denotes a main body of the image forming apparatus, which has a contact glass 2 on the upper surface of which a copy original is placed. 3
Is an automatic document feeder (ADF), whose rear end is rotatably attached to the image forming apparatus main body 1 via hinge mechanisms 4 and 4, and as shown in FIG.
It is designed to be able to stand still from a distance. The automatic document feeder 3 is provided with a feeder 90, 91 is a document placing table on which a copy document is placed, and 92 is a guide for regulating the copy document in a direction perpendicular to the transport direction. An ADF contact glass 93 is provided on the side of the contact glass 2. Then, at the bottom of the automatic document feeder 3, A
A slit 94 is provided at a position corresponding to the DF contact glass 93, and the original is read by an exposure optical system (not shown) when the original passes through the slit 94. An original mat 95 is provided at a position corresponding to the contact glass 2 on the side of the slit 94. Reference numeral 5 denotes an operation panel for inputting copy information and the like.

Reference numeral 6 denotes a front cover, the lower end of which is a hinge mechanism 7,
7 and rotatably attached to the image forming apparatus main body 1 so that when opened to the near side, it is held substantially horizontally projecting forward. Reference numeral 8 denotes a toner cartridge, and 9 denotes a toner collection tank.

Below the front cover 6, two upper and lower paper cassettes 10, 11 are provided. These are for automatically feeding fixed-size paper cut to a predetermined size, and are attached to the image forming apparatus main body 1 so as to be able to freely enter and exit in the front-rear direction. In addition, above the front cover 6,
A copy storage unit 13 for storing the copy discharged from the discharge unit 12 is provided.

Reference numeral 14 denotes a manual paper feed unit, and a manual tray 15
have. The manual feed tray 15 is rotatably attached to the image forming apparatus main body 1 via a support shaft (not shown) at the base end, and is in a state of protruding substantially horizontally toward the side as shown in FIG. , Which can stand almost vertically and in close contact with the side surface of the image forming apparatus main body 1.

The long paper 17 is supplied to a paper feed port 25 via a manual feed tray 15. The long paper 17 may be cut into an appropriate length or may be rolled in the length direction. When the long paper 17 is attached, a sensor 23 (not shown) for detecting the attachment is provided, and this sensor 23 is connected to a control circuit (not shown) of the image forming apparatus main body 1.

The description will be continued with reference to FIG. A paper feed roller 26 is provided in a paper feed port 25 of the manual paper feed unit 14, and a lift plate 27 and a separating mechanism 28 are provided below the paper feed roller 26. The lift plate 27 is rotated by a drive mechanism (not shown) with the left end in the figure as a fulcrum, and comes into contact with and separates from the outer peripheral portion of the paper feed roller 26. The discarding mechanism 28 includes a friction pad 29, a solenoid 30, and a link 31 connecting these components.

The friction pad 29 is formed of a material having a high coefficient of friction. One end of the friction pad 29 is rotatably attached to the image forming apparatus main body 1 via a support shaft 32, and is in contact with the outer peripheral portion of the paper feed roller 26. It is designed to be separated. Note that the friction pad 29 is urged in a direction in contact with the paper feed roller 26 via a spring (not shown).

A support portion 33 is provided at the other end of the friction pad 29, and one end of the link 31 is rotatably attached to the support portion 33 via a pin 34. The solenoid 30 is fixed to the image forming apparatus main body 1 with the movable iron core 30a facing upward.
The other end of the link 31 is rotatably mounted via the link 5. When the solenoid 30 is energized, the movable iron core 30a is retracted, and the link 31 causes the friction pad 29 to feed the feed roller 2
6. Rotate in the direction away from 6.

Above the friction pad 29, the long paper 17
Is provided. In the cutter 50, a moving body that supports a disk-shaped blade rotatably around a center point travels in the width direction of the long paper 17 and cuts the long paper 17 in the same direction. This cutter 50
The registration rollers 36 and 37 are provided above and are opposed to each other so as to sandwich the sheet transport path, and the rollers 36 are rotationally driven by a drive mechanism (not shown). A registration switch 38 for detecting the passage of the sheet is provided below these, and the control circuit drives the registration roller 36 according to a signal given from the registration switch 38.

In this embodiment, as shown in FIGS. 5 and 6, the long paper 17 is provided on both sides of the supply path 80 of the long paper 17 between the paper feed roller 26 and the registration rollers 36 and 37. A pair of skew detection sensors 81 and 82 such as a PI sensor for detecting skew of 17 are provided. Now supply route 8
0 is set substantially equal to the width of the registration rollers 36 and 37. When the side edge of the long sheet 17 is supplied in the supply direction F beyond the width W of the supply path 80, the skew detection sensor 8
1, 82 react to the side edge of the long sheet 17 so that the skew of the long sheet 17 is detected. Note that the skew detection sensors 81 and 82 may be reed switches, micro switches, or the like.

Also, as described above, the skew detecting sensor 81,
82 is provided upstream of the registration rollers 36 and 37 with respect to the feeding direction F of the long paper 17.
This is because even if the skew occurs, the skew is detected before the long paper 17 bites into the bearings and gears usually provided at both ends of the registration rollers 36 and 37.

Although not shown in FIGS. 5 and 6, a support member for supporting the registration rollers 36 and 37 and a member protruding toward the supply path 80 exist outside the supply path 80. ing. For example, the cutter 50 that cuts the long sheet 17 in the width direction across the supply path 80 is provided above and near the paper feed roller 26. There are members that protrude.

Returning to FIG. 3, the description will be continued. An image forming unit 39 is provided above the registration rollers 36 and 37. The image forming unit 39 includes a photosensitive drum 40 on the surface of which a toner image is formed, and a cleaning unit 41, a charger 42, a developing unit 43, a transfer roller 44, and the like disposed around the photosensitive drum 40 along the rotation direction. are doing.

A fixing section 45 is provided above the image forming section 39. The fixing unit 45 has a pair of rollers 46 and 47 which are arranged opposite to each other so as to sandwich the paper transport path. The fixing unit 45 sandwiches the paper between them and pressurizes and heats the paper to transfer the paper onto the paper. The toner image is melted and fixed on paper.

Above the fixing section 45, the discharge section 12 is provided. The discharge unit 12 has a pair of discharge rollers 48 and 49 that are arranged to face each other with the paper conveyance path therebetween.
The paper is sandwiched between 8, 49 and discharged into the copy storage unit 13.

In this embodiment, when the long paper 17 is attached, the attachment is performed by a sensor 23 (not shown).
Is detected, the mode is automatically shifted to the long paper mode suitable for the image forming process on the long paper.
The content of the long paper mode is, specifically, three elements such as not performing detection of JAM using the registration switch 38 or lengthening the detection time, not dividing the image memory, and not operating the separation mechanism 28. Consists of These will be described in detail below.

First, will be described. When the leading end of the sheet in the conveyance direction reaches the registration switch 38, the registration switch 38 is turned on.
8 turns OFF. The time from ON to OFF is determined by the size of the sheet, and when the time exceeds a predetermined time, the control circuit determines that double feeding has occurred and stops the operation. Such a process is possible because a gap is generated between the sheets when the fixed form paper is transported continuously.
Since the long paper is continuous, the registration switch 38 remains ON unless cut, and a malfunction occurs if the determination is made in the same length of time as in the case of regular paper. Therefore, in the long paper mode, whether such processing is performed or not
Or, the detection time is extended to prevent malfunction.

Next, will be described. When forming an image on a fixed-size sheet, the CPU of the control circuit temporarily develops the data read from the scanner into the bitmap memory. In this bitmap memory, original data is developed while securing an area for each page, but in the long paper mode, the CPU eliminates the division of the area for each page and sets the entire memory as one area. We are trying to secure.

Next, will be described. Judgment mechanism 2
Reference numeral 8 designates a friction pad 29 which presses the paper overlapping with the paper feed roller 26 to prevent the paper in contact with the friction pad 29 from being conveyed by the action of the friction pad 29 having a high friction coefficient. It separates two sheets of paper. In the case of long paper, double feed does not occur,
In the long paper mode, the friction pad 29
6 away from it.

Incidentally, even when the long paper 17 is loaded, the user operates the operation panel 5 to feed the paper cassette 1.
When 0 or 11 is selected, the paper is fed from the paper feed cassettes 10 and 11 without shifting to the long paper mode. That is, as shown in FIG. 4, the long paper 17 is attached (step # 10), and the sensor 23
Is turned on (step # 20), the CPU reads whether or not the paper feed cassettes 10 and 11 are selected and input on the operation panel 5 (step # 30).

When the paper cassettes 10 and 11 are selected, the CPU selects a cassette paper processing procedure (step # 40) and starts copying (step # 70). If the paper feed cassettes 10 and 11 have not been selected in step # 30, the CPU selects a manual paper feed processing procedure (step # 50), and then shifts to the long paper mode described above (step # 30). 60), copying is started (step # 70).

When the copy operation starts, step # 7
When the skew detection sensors 81 and 82 detect the skew of the long paper 17 in 2, the apparatus is immediately driven (copy operation).
Is stopped and JAM display is performed on the operation panel 5 (step # 74). Then, the user opens the predetermined cover and removes the skewed sheet. Thereafter, the cover is closed and reset is performed (step # 76), and the process returns to step # 10 to perform the copy operation again. On the other hand, in step # 72, the skew detection sensors 81 and 82
If the skew is not detected, the copy operation proceeds and the copy ends (step # 80), and the flow ends.

Next, a case where copying is actually performed will be described. First, the long paper 17 is attached and the manual feed tray 1
5 into the paper feed port 25. When a long copy document is set on the document table 91 and the print button on the operation panel 5 is pressed, the copy document is sent in the lengthwise direction, and the exposure optics placed below the ADF contact glass 93 is exposed. The image of the original is read by the system. Further, the lift plate 27 rotates upward to press the long paper 17 against the paper feed roller 26, and the paper feed roller 26 rotates to draw the leading end of the long paper 17 into the image forming apparatus main body 1. At this time, the friction pad 29 is separated from the paper feed roller 26.

The leading end of the long paper 17 rises in the transport path, passes through a registration switch 38, and passes through the registration roller 3
It stops between 6 and 37. In the image forming section 39, the surface of the photosensitive drum 40 is charged by the charger 42, the photosensitive drum 40 rotates, and the reflected light of the image of the copy document read by the exposure optical system is reflected by the photosensitive drum 40. The electrostatic latent image of this image is formed on the surface of the photosensitive drum 40. Then, the developing unit 43 applies toner to the surface of the photosensitive drum 40 to develop the electrostatic latent image.

When a predetermined time elapses after the long sheet 17 stops, the registration rollers 36 and 37 rotate and the long sheet 17
Rises again. When passing between the photosensitive drum 40 and the transfer roller 44, the toner image on the surface of the photosensitive drum 40 is transferred onto the long sheet 17. Then, the long paper 17
Reaches the fixing unit 45, is pressed and heated between the rollers 46 and 47, and thereby the toner image is melted and fixed on the long paper 17. Then, the long paper 17 on which the image is formed reaches the discharge unit 12 and is discharged by the discharge rollers 48 and 49.
Is discharged to the copy storage unit 13.

The long sheet 17 is cut in the width direction by the cutter 50 at the time when the long sheet 17 is conveyed by a predetermined length. When a new copy document is set on the document table 91 and the print button is pressed, the above-described operation is repeated to perform the next copy.

On the other hand, during the copying operation, the skew detection sensor 8
When the first and the second 82 detect the skew of the long paper 17, the drive (copy operation) of the apparatus is immediately stopped and the operation panel 5 is stopped.
A JAM display is displayed on the upper side, and the user opens a predetermined cover and removes the skewed long paper 17. At this time, the long paper 17 does not bite into the bearings and gears provided at both ends of the registration rollers 36 and 37, but the copy has progressed to some extent and the long paper 17 skewed can be removed. If it is difficult, the long sheet 17 may be cut and removed in the middle. And after closing the open cover,
The long sheet 17 is set, and the above operation is repeated to copy again.

The present invention is not limited to the above-described embodiment, and various modifications can be made to the above-described embodiment without departing from the gist of the present invention. For example, the sensor 81 for detecting the skew of the long paper may be disposed at any position in the supply path as long as the skew of the long paper can be detected, and the sensor 23 detects the attachment of the long paper. The same effect can be obtained even if the user inputs ON on the operation panel 5 instead of the automatic operation that is turned ON.

[0041]

As described above, according to the present invention, in an image forming apparatus in which a long sheet longer than a regular sheet is supplied and an image forming process is performed, the long sheet is fed at a predetermined position of the supply path in the width direction. A sensor that reacts when supplied beyond the area defined in the above, and control means that controls the drive of the device to stop when this sensor reacts, so that it is located at a position beyond the area. It is possible to prevent the trouble that the long paper is caught in the arranged components. Furthermore, even if the sensor reacts and the driving of the apparatus is stopped, the operation of removing the long paper is easy.

Further, if the sensors are provided on both sides of the supply path and are made to react to the side edge of the long sheet exceeding the area, the detection by the sensors can be surely performed.

Further, a feeding means for feeding the long sheet to the image forming section where the image forming process is performed is provided in the supply path, and the sensor is provided on the upstream side of the feeding means with respect to the supply path. Therefore, skew of long paper can be detected at an early stage, and wasteful use of paper and toner can be suppressed as much as possible.

Further, a protruding member is provided outside the supply path and protrudes toward the supply path, and the sensor is provided near the upstream side of the protruding member with respect to the supply path. It does not interfere with that member when it is run.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is an external perspective view of an image forming apparatus according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of the image forming apparatus of FIGS.

FIG. 4 is a flowchart illustrating a setting procedure of a long paper mode.

FIG. 5 is a diagram showing an arrangement of sensors for detecting skew of long paper.

FIG. 6 is a view of FIG. 5 viewed from below.

FIG. 7 is a diagram illustrating a state in which a long sheet is supplied obliquely.

[Explanation of symbols]

 1 Image Forming Apparatus Main Body 14 Manual Feed Unit 15 Manual Feed Tray 17 Long Paper 26 Feed Roller 36, 37 Registration Roller 80 Supply Path 81, 82 Skew Detection Sensor F Supply Direction of Long Paper 17 W Width of Supply Path 80

[Procedure amendment]

[Submission date] June 13, 2001 (2001.6.1
3)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C058 AB16 AC08 AE02 AF04 GB03 GB06 GB13 GB23 GB33 GB47 GB52 GB54 2H072 AA03 AA16 AA23 AB07 CA01 HA03 3F048 AA02 AB01 BA07 BA14 BB01 CA10 CC05 DC12 EA02 EB24

Claims (4)

[Claims]
1. An image forming apparatus in which a long sheet longer than a regular sheet is supplied to perform an image forming process, wherein the long sheet is supplied beyond a region defined in a width direction at a predetermined position of a supply path. An image forming apparatus, comprising: a sensor that reacts when the sensor is actuated; and control means that controls the device to stop driving when the sensor reacts.
2. The image forming apparatus according to claim 1, wherein the sensors are provided on both sides of the supply path, and react to a side edge of the long sheet exceeding the area.
3. A feeding means for feeding the long sheet toward an image forming section where an image forming process is performed, the feeding path being provided, and the sensor being upstream of the sending means with respect to the feeding path. The image forming apparatus according to claim 1, wherein the image forming apparatus is provided on a side.
4. A protruding member protruding toward the supply path outside the supply path, wherein the sensor is provided near an upstream side of the protruding member with respect to the supply path. The image forming apparatus according to claim 1, wherein:
JP2001171953A 2001-06-07 2001-06-07 Image forming apparatus Expired - Fee Related JP3714888B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001171953A JP3714888B2 (en) 2001-06-07 2001-06-07 Image forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001171953A JP3714888B2 (en) 2001-06-07 2001-06-07 Image forming apparatus

Publications (2)

Publication Number Publication Date
JP2002362782A true JP2002362782A (en) 2002-12-18
JP3714888B2 JP3714888B2 (en) 2005-11-09

Family

ID=19013647

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001171953A Expired - Fee Related JP3714888B2 (en) 2001-06-07 2001-06-07 Image forming apparatus

Country Status (1)

Country Link
JP (1) JP3714888B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107567421A (en) * 2015-05-15 2018-01-09 惠普发展公司,有限责任合伙企业 Prevent medium conveying from blocking

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107567421A (en) * 2015-05-15 2018-01-09 惠普发展公司,有限责任合伙企业 Prevent medium conveying from blocking
EP3277609A4 (en) * 2015-05-15 2018-12-26 Hewlett-Packard Development Company, L.P. Media transport jam prevention
US10364110B2 (en) * 2015-05-15 2019-07-30 Hewlett-Packard Development Company, L.P. Media transport jam prevention

Also Published As

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