JP2003084377A - Image recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image recording device which never overloads a driving force transmission means, etc., when a jam is removed. SOLUTION: The image recording device stops carrying a photosensitive material A at an exposure position by outputting a driving stop signal to a motor 302 once a control part detects the jamming of the photosensitive material A and also stops scanning and exposing the photosensitive material A by an optical scanner 24. A driving signal is outputted to the motor 270 to rotate an eccentric cam 206, thereby releasing nipping by the nip roller couples 82 and 84. Consequently, the lower roller 82B is not overloaded in order to draw the jamming photosensitive material A out and even if the lower roller 82B reverses, a flat belt 306 is prevented from shifting along the width of the outer circumferential surface of a pulley 300 or falling from the pulley 300.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus for exposing a photosensitive material to form an image.

[0002]

2. Description of the Related Art In recent years, a printing apparatus utilizing digital exposure, that is, an image recorded on a film is photoelectrically read, and after the read image is converted into a digital signal, various image processes are performed to record the image. A digital photo printer has been put into practical use, which is used as image data, and a photosensitive material is scanned and exposed by recording light modulated according to this image data to record an image (latent image), which is subjected to development processing and output as a print (photograph). ing.

Such a digital photo printer is basically composed of an input machine having a scanner (image reading apparatus) and an image processing apparatus, and an output machine having a printing apparatus (image recording apparatus) and a developing machine. It In the scanner, the projection light of the image photographed on the film is photoelectrically read by an image sensor such as a CCD sensor and sent to the image processing device as image data (image data signal) of the film. The image processing device performs predetermined image processing on this image data,
It is sent to the printing apparatus as output image data (exposure condition) for image recording. If the printing apparatus is, for example, an apparatus that uses light beam scanning exposure, it deflects the light beam modulated according to the supplied image data in the main scanning direction and also exposes it in the sub scanning direction orthogonal to the main scanning direction. By scanning and transporting the material, the light beam scans and exposes the photosensitive material to form a latent image, and a backprint is recorded. In the developing machine, the exposed light-sensitive material is subjected to a predetermined developing process or the like to obtain a print in which the image photographed on the film is reproduced.

As described above, the long photosensitive material wound in a roll shape is conveyed in the sub-scanning direction as it is, and the main scanning is performed by the light beam to continuously repeat the image formation and develop the image as it is. One print is made by cutting into a predetermined length.

This image recording apparatus is provided with two sets of conveying roller pairs on the upstream side and the downstream side of the exposure position in the conveying direction. By nipping the photosensitive material, the flatness of the photosensitive material is ensured to ensure accuracy. It is designed to convey well and to form good images.

A pulley is attached to the end of the rotary shaft of the drive roller that constitutes one of the pair of conveying rollers, and the flat metal belt is wound between the pulley and the pulley attached to the rotary shaft of the motor. The driving force is transmitted via. Here, the metal flat belt is used because unlike the gear drive, there is no rotation unevenness and the initial size can be maintained for a long period of time, so that accurate feeding of the photosensitive material can be achieved.

A crown-shaped recess is formed on the outer peripheral surface of the pulley to prevent the flat belt from shifting in the width direction of the outer peripheral surface of the pulley.

[0008]

In the conventional image recording apparatus, as described above, a crown-shaped recess is formed on the outer peripheral surface of the pulley around which the flat belt is wound so that the pulley has the function of automatically aligning the belt. However, if the recess is deepened in order to enhance the self-aligning function, the flat metal belt may repeatedly bend in the cross section in the width direction and may be broken due to metal fatigue.

Therefore, the self-centering function of the pulley cannot be strengthened beyond a predetermined level, and when the conveying roller pair is reversely rotated and overloaded, the metal flat belt may come off from the pulley. there were.

For example, when a jam occurs near the exposure position of the image recording apparatus, the user opens the lid of the apparatus and pulls the photosensitive material from the upstream side of the exposure position to pull out the photosensitive material nipped by the pair of conveying rollers. Do.

As a result, the drive roller nipping the photosensitive material reversely rotates and overloads the flat belt, causing the flat belt to be displaced in the width direction of the outer peripheral surface of the pulley, or to be removed from the pulley. There was a fear.

Therefore, an object of the present invention is to provide an image recording apparatus in which an overload does not act on a drive source or the like when removing a jam in order to solve such a problem.

[0013]

The invention according to claim 1 is
In an image recording apparatus that records an image by exposing a photosensitive material, it is disposed near an exposure position and has a driving roller and a nip roller.
And a nip means for nipping the photosensitive material to the exposure position with high accuracy and a nip means for nipping the nip roller with a predetermined nip pressure with respect to the driving roller, and a driving force of a driving source. When the driving force transmitting means for transmitting to the conveying roller pair, the jam detecting means for detecting the jam of the photosensitive material, and the jam detecting means detect the jam of the photosensitive material, the nip of the conveying roller pair is released and the nip is released. And a nip releasing means for maintaining the state.

The operation of the invention according to claim 1 will be described.

In the image recording apparatus, the nip roller is nipped at a predetermined nip pressure by the nip means with respect to the driving roller forming the pair of conveying rollers near the exposure position. Here, the driving force of the driving source is transmitted to the driving roller via the driving force transmitting means, so that the photosensitive material nipped between the driving roller and the nip roller is accurately fed to the exposure position. As a result, high quality image recording is performed.

At this time, when the jam detecting means detects a jam of the photosensitive material, the nip releasing means releases the nip of the pair of conveying rollers to maintain the nip released state. Therefore,
When the jammed photosensitive material is pulled out from between the pair of conveying rollers, it is possible to prevent the driving roller from rotating in the reverse direction and exerting an excessive load on the driving force transmitting means or the driving source.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a blockage detecting means for detecting that the cover of the device is closed, and the blockage detecting means detects blockage of the cover of the device. The nip means nips the pair of conveyance rollers that have been released from the nip.

The operation of the invention according to claim 2 will be described.

The user opens the lid of the device to remove the jammed photosensitive material. At this time, the nip of the pair of transport rollers is automatically released. Therefore, if the lid is closed and the apparatus is driven as it is, the conveyance of the photosensitive material may be started without the conveyance roller pair nipping the photosensitive material. Therefore, when the closing detection means detects that the lid of the opened device is closed, the above-mentioned inconvenience is surely avoided by automatically returning the pair of conveying rollers to the nip state by the nip means. can do.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described above, the driving force transmitting means includes a pulley attached to a rotation shaft of the driving roller, a pulley attached to the driving source, and a flat belt wound around both pulleys. Characterize.

The operation of the invention according to claim 3 will be described.

The driving force is accurately transmitted to the driving roller via the flat belt and the pulley in a state where the nip roller nips the driving roller with a predetermined nip pressure by the nip means. As a result, the photosensitive material nipped by the pair of conveying rollers is accurately conveyed to the exposure position, and high-quality image formation is performed.

On the other hand, when the jam detecting means detects a jam of the photosensitive material, the nip releasing means releases the nip of the pair of conveying rollers to maintain the nip released state. Therefore, when the jammed photosensitive material is pulled out from between the pair of conveying rollers, the driving roller whose nip is released reversely rotates and an excessive load is applied to the flat belt wound around the pulley, and the flat belt is rotated around the outer circumference of the pulley. It is possible to prevent displacement in the width direction of the surface and separation from the pulley.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the nip is released when the nip of the conveying roller pair is released by the nip releasing means. It is characterized in that a notification means for notifying the user is provided.

The operation of the invention according to claim 4 will be described.

Since the notification means notifies the user of the release of the nip of the conveying roller pair, the jammed photosensitive material can be taken out after the user confirms the release of the nip. Therefore, it is possible to prevent the photosensitive material from being taken out before the nip is released, and to prevent the driving roller and the driving force transmitting means from being overloaded by the reverse rotation of the driving roller. For example, an excessive load is applied to the flat belt wound between the pulley attached to the shaft end of the drive roller and the pulley attached to the drive motor, and the flat belt shifts in the width direction on the outer peripheral surface of the pulley. , It can be prevented from coming off the pulley.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The image recording apparatus of the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings. First, a general description of the image recording device will be given.
The twin nip roller pair of the sub-scanning conveyance unit, which is a main part, will be described later. (Overall Configuration of Image Recording Device) As shown in FIG. 1, the image recording device 10 is mainly used for an image recording device of a digital photo printer, and is read and read by an image reading device such as a film scanner. The photosensitive material A is scanned and exposed by the light beam to form a latent image according to the exposure condition (image recording condition) determined by the setup device according to the image, and the image is recorded on the film by developing the latent image. A device for outputting a printed image, which basically includes an image recording unit 12, a developing unit 14, a drying unit 16, a discharging unit 18,
An electrical component section 20 including a control board, a power supply section, etc.
Is configured.

As shown in FIG. 2, the image recording section 12 includes a printing / transporting device 22 and a light beam scanning device 24.

The printing / transporting device 22 pulls out the photosensitive material A wound in a roll into a photosensitive material magazine 27, which will be described later, and transports the photosensitive material A along a predetermined path while recording image position information, image exposure (printing), and backing. A device for performing printing or the like and conveying it to the developing unit 14 which is the next step, a photosensitive material supply unit 26, an image position information forming unit 2 for recording image position information.
8, exposure unit 30, back print unit 32, reservoir 3
4 and conveying means for conveying the photosensitive material A through a predetermined path passing through these portions.

The photosensitive material supply unit 26 is a portion for loading a photosensitive material magazine 27 which is made by housing the photosensitive material A wound in a roll in a light-shielding case, and is a printing / conveying device 2.
It is located on the upper side of the exposure unit 2 and on the side of the exposure unit including the exposure unit 30 and the light beam scanning device 24.

In a portion adjacent to the photosensitive material magazine 27, a pair of drawing rollers 36 for drawing the photosensitive material A from the photosensitive material magazine 27, a width guide member 40 for regulating the width direction of the photosensitive material A, and a loop of the photosensitive material A. And a first loop forming portion 42 having a U-shape.

The pull-out roller pair 36 can be nipped and released by a nip releasing mechanism (not shown).

The width guide member 40 adjusts the guide width according to the size (width) of the photosensitive material A by a guide width adjusting mechanism (not shown).

The first loop forming section 42 forms a loop (slack) of the photosensitive material A so as to absorb a speed difference due to conveyance and stop of the photosensitive material A by the image position information forming section 28 arranged downstream. It is the part to do.

An image position information forming section 28 having a punch 50 for forming a punch hole in the photosensitive material A is provided on the downstream side of the first loop forming section 42. The image position information forming unit 28 is used for cutting the photosensitive material A performed in the discharging unit 18 described later, and for exposure and back printing, position information for each print (so-called frame information).
Alternatively, image position information such as position information (so-called sort information) for each appropriately set unit number of films such as 24 films or 36 films is formed on the photosensitive material A.

An exposure section 30 is disposed downstream of the image position information forming section 28 with an endless belt 59 wound around the conveying roller 56 and the rollers 57A to 57C sandwiched therebetween.

The exposure section 30 includes a second loop forming section 58,
It includes a sub-scan transport unit 60 and a third loop forming unit 62.

The sub-scanning conveyance section 60 includes a pair of registration rollers 70 and 72 for guiding the photosensitive material A to the exposure position and a width guide member 90, and a nip roller pair for conveying the photosensitive material A to the exposure position with accuracy on the downstream side thereof. 82 and 84 are provided. The light beam scanning device 24 scans and exposes the photosensitive material A conveyed in the sub-scanning direction with high precision by the nip roller pair 82 and 84, so that the photosensitive material A is two-dimensionally exposed.

The second loop forming portion 58 and the third loop forming portion 58 are provided on the upstream side and the downstream side of the exposure position (sub-scanning conveyance section 60).
A loop forming part 62 is provided. Therefore, the sub-scan transport of the photosensitive material A in the sub-scan transport unit 60 can be carried out with high accuracy by eliminating the adverse effects of the transport means arranged upstream and downstream, so-called back tension, pulling and the like. It is possible.

Further, the back print section 32 is provided on the downstream side of the third loop forming section 62 via a conveying roller 98.

In the back print section 32, the printing device 10
According to 2, various print data such as the shooting date of the original film and the recording date on the photosensitive material A are recorded on the back surface of the print.

A first cutter 112 and a reservoir (fourth loop forming section) 34 are provided on the downstream side of the back print section 32 via the conveying roller 106.

The first cutter 112 is not used in a normal operating state. For example, when the exposed photosensitive material A stored in the reservoir 34 described later is discharged after the exposure operation is completed, the photosensitive material is discharged. It cuts A.

The reservoir 34 is provided in order to absorb a difference in processing speed between the image recording section 12 and the developing section 14 and perform efficient print production.

Further, on the downstream side of the reservoir 34, a second cutter 124 and a fifth loop forming portion 125 are arranged via the conveying roller 120.

The second cutter 124 is a cutter for cutting the photosensitive material A in the case of trouble or the like. For example, when the amount of the photosensitive material A accommodated in the reservoir 34 becomes a predetermined amount or less, or when the developing section is used. When trouble occurs in 14 or the like, by cutting the photosensitive material A with the second cutter 124,
It is possible to prevent the exposed photosensitive material A stored in the reservoir 34 from being adversely affected, and to prevent the photosensitive material A from being unnecessarily pulled by the developing section 14 and damaging the respective transporting means of the printing and transporting device 22.

The fifth loop forming section 125 finally absorbs the difference between the processing speed of the printing and conveying device 22 and the processing speed of the developing section 14, and the conveyance / stop of the photosensitive material A by the conveying means 118, and develops. The portion 14 prevents the photosensitive material A from being unnecessarily pulled and damaged.

A conveying roller 132 and nip rollers 134 and 136 are provided on the downstream side of the fifth loop forming section 125, and the photosensitive material A is fed to the developing section 14.

The photosensitive material A reaching the developing section 14 is shown in FIG.
As shown in FIG. 1, a developing tank 136, a fixing tank 138, and a washing tank 1
It is sent to the drying unit 16 via 40, cut into a predetermined length by the cutter 148 in the discharging unit 18 to be a finished print, and stored in the sorter 144.

When the tip of the photosensitive material A reaches, the first loop forming part 42 to the fifth loop forming part 125 respectively detect the photosensitive material A as indicated by a chain double-dashed line by guide means (not shown). It is configured to linearly guide downstream. (Configuration of Sub-scanning Conveying Section) In the image recording apparatus 10 thus formed, the sub-scanning conveying section 60 will be described in detail.

The sub-scanning conveyance section 60 uses the photosensitive material A before exposure.
Basically, a width direction restricting section 150 for positioning in the width direction and an exposure conveying section 152 for exposing the photosensitive material A positioned in the width direction with high accuracy are basically formed.

As shown in FIG. 3, the width-direction restricting portion 150 includes a pair of width-direction positioning guides 90A and 90B (hereinafter, may be simply referred to as positioning guides) that can approach and separate from each other in the width direction. The registration roller pair 70 and 72 presses the widthwise end of the photosensitive material A against the positioning guide 90A.

The width direction positioning guides 90A and 90B are
As the timing belt 160 moves by driving the motor 158, the sliders 162, 16 meshed with the timing belt 160 at the engaging portions 162A, 164A.
4 are configured to move in mutually opposite directions along shafts 166 and 168, respectively.

Specifically, the drive gear 17 of the motor 158
0, the rotational force is transmitted to the first gear 174 via the driven gear 172, and the timing belt 160 spanned between the first gear 174 and the second gear 176 rotates.
Therefore, the timing belt 160 is rotated by the driving of the motor 158, and the sliders 162 and 164 (positioning guides 90A and 90B) that are engaged with the opposite sides of the timing belt 160 move toward and away from each other. .

The positioning guides 90A and 90B are
The upstream side in the carrying direction is supported by the sliders 162 and 164, respectively, and the downstream side in the carrying direction is slidably supported by the shaft 178. Also, the positioning guide 90
As shown in FIGS. 3 and 4, A and 90B are provided with guide grooves 180 and 182 having a substantially U-shaped cross section, and are provided with a guide function for introducing the photosensitive material A upstream in the transport direction. The guide portion 183 has a shape that spreads outward in the direction and the width direction.

Further, the positioning guides 90A and 90B are respectively provided with three rollers 184 along the carrying direction, and the vertical surfaces 180A and 182A constituting the guide grooves 180 and 182 having a U-shaped cross section are provided. Exposed.

Therefore, the positioning guides 90A, 90
It is possible to reduce the sliding resistance of the widthwise end faces of the photosensitive material A pressed against the vertical surfaces 180A and 182A of B.

As shown in FIG. 5, guide plates 185A, 18 are provided between the pair of side wall plates 218A, 218B on the upper and lower sides of the positioning guides 90A, 90B.
5B is provided.

On the other hand, a pair of registration rollers 70 and 72 for guiding the photosensitive material A to the positioning guide 90A is disposed between the positioning guides 90A and 90B as shown in FIGS. Specifically, the lower rollers 70A and 72A
Are provided on the drive shafts 186 and 188 and are arranged so as to project upward from the guide plate 185B. On the other hand, as shown in FIG. 4, the rotating shafts 190 and 192 of the upper rollers 70B and 72B are pivotally supported by the guide plate 185A, and the rotating shafts 190 and 192 are directed downward by the spring 194 bridged over the guide plate 185A. The upper rollers 70B and 72B that are biased and are arranged to project downward from the guide plate 185A are the lower rollers 70B and 72B.
It will be nipped with A and 72A. The pair of registration rollers 70 and 72 have a rotation direction of the rollers slightly inclined toward the positioning guide member 90A with respect to the conveying direction, so that the photosensitive material A being conveyed is positioned by the positioning guide member 9A.
The photosensitive material A is positioned in the width direction by being pressed against the vertical surface 180A of the groove 180 of 0A.

Next, the exposing and conveying section 152 provided on the downstream side of the width direction regulating section 150 will be described.

The exposure / transport unit 152 has two pairs of nip rollers 82 and 84, as shown in FIGS. The pair of nip rollers 82 and 84 is the shaft 20 that is the drive shaft.
Lower rollers 82A and 84A provided at 0 and 202,
It is composed of upper rollers 82B and 84B that move up and down together with the shafts 204 and 205 so as to approach the lower rollers 82A and 84A for nipping or to separate and release the nip.

Shaft 2 on which lower roller 82A is formed
The driven pulley 300 is attached to the end portion of the side wall plate 218 </ b> B of the motor 00 that projects to the outside.
The flat belt 306 made of metal is wound around the drive pulley 304 attached to the rotating shaft of the No. 02. On the other hand, the roller 308 is arranged at the end of the shaft 200 protruding outside the side wall plate 218A, and between the roller 308 and the roller 310 arranged at the end protruding outside of the side wall plate 218A of the shaft 202. A flat belt 312 made of metal is wound around.

That is, by driving the motor 302, the shaft 200 (lower roller 82A) accurately rotates via the pulley 304, the flat belt 306, and the pulley 300,
The shaft 202 (lower roller 84A) connected via the flat belt 312 rotates in synchronization with the shaft 200.

Subsequently, in order to nip / un-nip the nip roller pair 82, 84, the upper rollers 82B, 84B
A mechanism for moving up and down will be described. A pair of this mechanism is provided at both ends in the width direction of the upper rollers 82B and 84B, but since they have the same configuration, only the side wall plate 218A side will be described and the side wall plate 218B side description will be omitted.

The upper rollers 82B and 84B are shown in FIGS.
As shown in FIG. 6, the plate 208 moves up and down along the guide rollers 210A to 210D by the rotation of the eccentric cam 206, and the sliding member 212A engaged with the plate 208,
212B is a nip or a nip released against the urging force by the urging force of the spring 214 constantly downward (nip state).

Specifically, as shown in FIG. 7, the shaft 204 of the upper roller 82B is rotatably supported by the sliding member 212A. The sliding member 212A is disposed in the hole 220 formed in the side wall plate 218A, and is constantly urged downward by the spring 214. Further, a long hole 222 extending in the transport direction is formed in the sliding member 212A, and the plate 2 to be described later is formed.
By inserting the pin 224 of 08, the sliding member 212A and the plate 208 are engaged. The hole 2
A guide member 226 that guides the sliding member 212A in the vertical direction is disposed on the unit 20.

The structure of the nip releasing mechanism of the nip roller pair 84 (for example, the sliding member 212B) is the same as that of the nip roller pair 82, and the description thereof is omitted.

Next, the plate 208 that moves up and down together with the sliding members 212A and 212B will be described.

As shown in FIG. 7, a pair of pins 224 are formed on the lower portion of the plate 208 so as to project. The pins 224 are slid together with the plate 208 by being inserted into the long holes 222 of the sliding members 212A and 212B. Moving members 212A, 2
12B is configured to move up and down integrally.

The guide rollers 210A to 210D for guiding the plate 208 up and down are alternately arranged in a zigzag pattern on the upstream side and the downstream side in the carrying direction in the vertical direction. A V-groove 228 into which the 208 enters is formed. Therefore, the upstream side portion 20 of the plate 208 in the transport direction is sandwiched by the hole portion 230 extending vertically in the central portion of the plate 208.
8A enters the V groove 228 of the guide rollers 210A and 210C, and the downstream side portion 2 of the plate 208 in the transport direction.
08B is the V groove 228 of the guide rollers 210B and 210D.
It is configured to enter. Here, as shown in FIG.
208 A of conveyance upstream side, 208 B of conveyance downstream side
The corner portion 229 that abuts the V groove 228 is chamfered to increase the contact area and suppress wear. Therefore, in the plate 208, the upstream side portion 208A in the transport direction and the downstream side portion 208B in the transport direction are the guide rollers 210A and 210C, the guide rollers 210B, and 2, respectively.
It is guided by 10D and moves up and down with precision.

Further, the plate 208 is formed with an engagement pin 232 that protrudes inward at the top. The engaging pin 232 is in contact with the eccentric cam 206 that is rotatably supported by the side wall plate 218A, and the plate 208 moves up and down by the rotation of the eccentric cam 206. The eccentric cam 206 on the side wall plate 218A side is provided on the same rotary shaft 207 as the eccentric cam 206 on the side wall plate 218B side (see FIG. 6). Further, as shown in FIG. 6, the motor 27 is provided outside the side wall plate 218A.
0 is arranged, and a drive gear 272 provided on the rotation shaft of the motor 270 and a driven gear 274 provided on the end portion of the rotation shaft 207 are meshed with each other. That is, the motor 27
By driving 0, the pair of eccentric cams 206 can rotate synchronously.

Therefore, the plate 208 is guided by the guide rollers 210A to 210D to move up and down by the rotation of the eccentric cam 206, and the sliding members 212A and 212B engaged with the plate 208 are moved up and down. That is, the upper rollers 82B and 84B that are constantly urged downward by the springs 214 are the lower rollers 82A and 84A.
The nip roller pairs 82 and 84 are configured to approach / separate with respect to, and perform nip / nip release.

As shown in FIG. 4, the lower roller 82
A plate 234 is disposed between the rollers A and 84A to prevent the leading edge of the photosensitive material A from entering between the lower rollers 82A and 84A and causing a jam. Further, in order to reduce the sliding friction of the photosensitive material A, the plate 234 is
The rollers 236 are arranged so as to project.

A leading edge detection sensor 240 for detecting the leading edge of the photosensitive material A is provided on the upstream side of the nip roller pair 82 in the conveying direction.
Is provided.

Further, as shown in FIG. 8, the eccentric cam 206 is formed with a detection projection 242 for sensor detection, and the detection sensor 244 detects the rotation amount of the eccentric cam 206.

As shown in FIG. 4, the upper and lower guide plates 250, 252, the rotatable roller 254 projecting downward from the upper guide plate 250, and the guide plate are provided on the downstream side of the exposure / transport unit 152. 250, 25
The roller pair 256 is disposed at the downstream end of the second transport direction. This is to prevent the photosensitive material A from being curved in the third loop forming portion 62, so that the influence of the bending does not reach the exposure transporting portion 152.

Further, on the downstream side of the nip roller pair 84 in the conveying direction, a leading edge detection sensor 260 for detecting the leading edge of the photosensitive material A passing through the nip roller pair 84 is provided.

On the upstream side of the exposure unit 30 in the transport direction,
A punch hole detection sensor 280 (see FIG. 2) is provided. The punch hole detection sensor 280 detects the punch holes formed in the photosensitive material A by the image position information forming section 28 and outputs a detection signal to the control section 282. The control unit 282 controls the exposure timing of the light beam scanning device 24 based on this detection signal.

The control unit 282 of the image recording apparatus 10 is shown in FIG.
1, in addition to the punch hole detection sensor 280, a motor 302 for rotating the drive roller 82A (drive roller 84A), and a motor 2 for rotating the eccentric cam 206.
And 70.

Further, the control section 282 conveys the photosensitive material A conveyed on the basis of the detection signal from the punch hole detection sensor 280 and the photosensitive material A conveyed on the basis of the drive amount of the drive motor 302. It is determined that the photosensitive material A is jammed when the difference in the amount of conveyance exceeds a predetermined amount as compared with the amount.

When the controller 282 detects a jam of the photosensitive material A, it outputs a drive stop signal to the motor 302 to stop the conveyance of the photosensitive material A by the nip roller pair 82 and 84, and at the same time, the light beam scanning device. The scanning exposure by 24 is stopped. Further, a driving signal is output to the motor 270 to rotate the eccentric cam 206 by 180 degrees to release the nip of the nip roller pair 82, 84.

The image recording apparatus 10 having the above structure
The operation of the (sub-scan transport unit 60) will be described.

First, when the magazine 27 is set in the image recording apparatus 10, the drive motor 158 is driven corresponding to the size of the photosensitive material A stored in the magazine 27, and the space between the positioning guide members 90A and 90B. The distance is adjusted.

When the photosensitive material A is pulled out from the magazine 27 and reaches the sub-scanning conveying section 60, the width direction regulating section 15
0 between the upper guide plate 185A and the lower guide plate 185B (positioning guide members 90A, 90
B) and is pressed against the positioning guide member 90A by the pair of registration rollers 70 and 72.

Photosensitive material A that has passed through the widthwise direction regulating portion 150
When the tip end of the is detected by the tip detection sensor 240, a motor (not shown) is driven and the eccentric cam 206 is rotated to the lower limit position (see FIG. 7). That is, the plate 208 and the sliding members 212A and 212B descend, and the upper rollers 82B and 84B and the lower rollers 82A and 84A are nipped by the urging force of the spring 214.

In this state, the tip of the photosensitive material A is inserted into the nip roller pair 82, 84 and conveyed. Therefore, since the leading edge of the photosensitive material A heads toward the nip roller pair 84 while being nipped by the nip roller pair 82, curling of the leading edge of the photosensitive material A is suppressed, and between the upper roller 84B and the lower roller 84A of the nip roller pair 84. It can be inserted securely, and the occurrence of jam can be suppressed.

As a result, when the output of the tip detection sensor 260 detects that the tip of the photosensitive material A has passed the nip roller pair 84, the motor of the eccentric cam 206 is driven to rotate to the upper limit position. As a result, the plate 208 moves up, and the sliding members 212A and 212B move toward the spring 2.
It rises against the elastic force of 14. That is, the upper rollers 82B and 84B are separated from the lower rollers 82A and 84A to release the nip state.

As a result, the photosensitive material A becomes free in the exposure / conveying section 152, and the registration in the width direction can be favorably performed by the pair of registration rollers 70 and 72 in the width direction regulating section 150.

Further, before the exposure start position of the photosensitive material A reaches the exposure conveyance section 152, that is, after a lapse of a predetermined time after the tip detection sensor 240 detects the tip, the motor is driven to drive the eccentric cam 206. Then, the nip roller pair 82 and 84 are nipped again. As a result, since the photosensitive material A is nipped by the pair of nip rollers 82 and 84 before and after the exposure position, the flatness and the positional accuracy are ensured at the exposure position, and the pulley 302 is driven by the motor 302.
04, the flat belt 306, and the pulley 300, the lower rollers 82A and 84A, which are rotated with high precision, precisely convey the image to record an image with high quality.

By the way, in the control section 282, the transport amount of the photosensitive material A calculated based on the punch hole detection signal of the photosensitive material A by the punch hole detection sensor 280 and the motor 302.
The conveyance amount of the photosensitive material A calculated from the driving amount is compared. When the difference between the two carry amounts becomes equal to or more than a predetermined amount, the control unit 282 determines that the photosensitive material A is jammed,
The drive stop signal is output to the motor 302 and the light beam scanning device 24, and the drive signal is output to the motor 270.

As a result, the motor 302 stops driving and immediately stops the conveyance of the photosensitive material A nipped between the pair of nip rollers 82 and 84. The light beam scanning device 24 also simultaneously stops the exposure scanning of the photosensitive material A.

On the other hand, the motor 270 is driven to rotate the eccentric cam 206 by 180 degrees, and the engaging pin 232 (plate 208) in contact with the eccentric cam 206 is raised. As a result, the sliding member 21 that engages with the plate 208
2A and 212B rise up against the elastic force of the spring 214, and the upper rollers 82B and 84B are moved to the lower roller 82A and
Separated from 84A. That is, the nip roller pair 8
Release the nip of 2,84.

In this state, the occurrence of a jam and the release of the nip are displayed on a monitor (not shown) or a warning sound is emitted to notify the user. As a result, the user recognizes the occurrence of the jam and the release of the nip, and the cover of the image recording apparatus 10 is opened to take out the photosensitive material A. In the exposure unit 30, the guide plates 185A, 1
It is difficult to directly take out the photosensitive material A by using the 85B, the guide plates 250, 252 and the like. Therefore,
The photosensitive material A is grasped at the upstream end of the exposure section 30 in the transport direction, and the photosensitive material A is pulled out from the exposure section 30.

Since the notice to the user is made after the nip of the nip roller pair 82, 84 is released, it is ensured that the photosensitive material A is pulled out while the nip roller pair 82, 84 nips the photosensitive material A. Avoided.

As a result, when the photosensitive material A is pulled out (jamming is removed), an excessive rotational load does not act on the lower rollers 82A and 84A in the direction opposite to the conveying direction. That is, the lower roller 82 </ b> A (shaft 200) rotates in the direction opposite to the conveying direction, an excessive load acts on the flat belt 306 wound around the pulley 300, and the flat belt 306 has a width on the outer peripheral surface of the pulley 300. Shift in the direction,
It can be reliably prevented from coming off the pulley 300.

In the state where the nip is released (see FIG. 9), the elastic force of the spring 214 (nip biasing force) is constantly acting on the eccentric cam 206 from the engaging pin 232. However, from the engagement pin 232 to the eccentric cam 206
Since the elastic force F acting on the eccentric cam 206 acts in the radial direction of the eccentric cam 206, it does not act on the eccentric cam 206 as a rotational moment. Therefore, even if the motor 270 is de-energized, the nip released state can be maintained. That is, the motor 270 needs to be energized only when the eccentric cam 206 is rotating.

Further, the image recording apparatus 10 may be provided with a sensor for detecting the closure of the lid of the apparatus. That is, when the user closes the lid after the jam processing is completed, a detection signal is input from the sensor to the control unit 282, the control unit 282 detects the completion of the jam processing, and outputs a drive signal to the motor 302 to output the eccentric cam 206. It is also possible to adopt a configuration in which the pair of conveying rollers 82 and 84 are rotated to automatically return to the nip state. According to this structure, it is possible to reliably prevent the photosensitive material A from being conveyed while the nip is released.

In this embodiment, the flat belt and the pulley are used to transmit the driving force. However, in addition to this, for example, the gear mechanism is used to transmit the driving force, and the nip releasing and nip returning configurations are also applied. be able to.

[0099]

In the image recording apparatus according to the present invention, when the jammed photosensitive material is removed, the nip of the conveying roller pair is automatically released. It is possible to reliably prevent the load from acting.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of an image recording apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a printing and conveying device according to an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a width direction restricting portion according to an embodiment of the present invention.

FIG. 4 is a side view showing a sub-scan transport unit according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a sub-scanning conveyance section according to the embodiment of the present invention.

FIG. 6 is a perspective view showing an exposure transport unit according to an embodiment of the present invention.

FIG. 7 is a partially exploded perspective view of the exposure transport unit according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram of a nip state of the exposure transport unit according to the embodiment of the present invention.

FIG. 9 is an explanatory diagram of a nip release state of the exposure transport unit according to the embodiment of the present invention.

FIG. 10 is an explanatory view of the contact state between the guide roller and the plate according to the embodiment of the present invention.

FIG. 11 is a block diagram showing a control unit of the image recording apparatus according to the embodiment of the present invention.

[Explanation of symbols]

10 ... Image recording device 82 ... nip roller pair (conveying roller pair) 82A ... Lower roller (driving roller) 82B ... Upper roller (nip roller) 84 ... nip roller pair (conveying roller pair) 84A ... Lower roller (driving roller) 84B ... Upper roller (nip roller) 206 ... Eccentric cam (nip releasing means) 208 ... Plate (nip releasing means) 232 ... Engaging pin (nip releasing means) 300 ... Pulley (driving force transmission means) 304 ... Pulley (driving force transmission means) 306 ... Flat belt (driving force transmission means)

Claims (4)

[Claims] 1. An image recording apparatus for exposing a photosensitive material to record an image, comprising a driving roller and a nip roller arranged in the vicinity of the exposure position, and nipping the photosensitive material to precisely position the exposure position. A pair of feeding conveyance rollers, a nip means for nipping the nip roller with the drive roller at a predetermined nip pressure, a driving force transmission means for transmitting a driving force of a driving source to the pair of conveyance rollers, and a jam of the photosensitive material And a jam detecting unit that detects a jam when the jam detecting unit detects a jam of the photosensitive material,
An image recording apparatus, comprising: a nip releasing unit that releases the nip of the pair of conveyance rollers and maintains the nip released state. 2. A conveyance roller pair in which a closing detection means for detecting that the lid of the apparatus is closed is provided, and the closing detection means detects closing of the lid of the apparatus to release the nip of the nip means. The image recording apparatus according to claim 1, wherein the image recording device is a nip. 3. The driving force transmitting means comprises a pulley attached to the rotary shaft of the drive roller, a pulley attached to the drive source, and a flat belt wound around both pulleys. The image recording apparatus according to claim 1, wherein the image recording apparatus is a recording medium. 4. The notification means for notifying the user that the nip has been released when the nip of the conveying roller pair is released by the nip releasing means. The image recording apparatus according to item 1.