JP2005096921A - Exposure device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exposure device capable of eliminating problems such as banding in a finished picture print in an exposure device including an exposure engine with an exposure shaft extended in a main scanning direction and a pair of conveyance rollers conveying sensitized material in an auxiliary scanning direction which crosses with the main scanning direction, the pair of conveyance rollers having a driving roller rotated and driven by a driving source and a pressing roller supported so as to be freely rotated, the pressing roller being provided so as to be switched between the pressing condition in which the sensitized material is pressed to the driving roller and a pressing release condition in which pressing is released. <P>SOLUTION: The pressing roller 52 is constituted of a shaft 52A extended in parallel to the main scanning direction and a roller body 52B supported on a peripheral surface of the shaft 52A so as to be rotated freely. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention includes an exposure engine having an exposure axis extending in the main scanning direction, and a conveying roller pair for conveying the photosensitive material in a sub-scanning direction intersecting the main scanning direction. A driving roller that is rotationally driven by the motor and a pressure-bonding roller that is supported in an idle manner. The pressure-bonding roller is between a pressure-bonding state in which a photosensitive material is pressed against the driving roller and a pressure-released state in which the pressing is released. It is related with the exposure apparatus provided so that switching is possible.

As this type of exposure apparatus, there is Patent Document 1 shown below as prior art document information related to the present invention. In the exposure apparatus described in Patent Document 1, a pair of transport rollers is provided on the upstream side and the downstream side in the transport direction across the exposure point, and the upstream drive roller and the downstream drive roller are always the same. As illustrated in FIG. 8, the pressure roller is idled and supported by a ball bearing 70 in the vicinity of the free end of a swing arm 54 that is swingably supported by the housing. The shaft 120 is formed of a solid round bar, and a rubber photosensitive material support 130 that is directly and integrally provided on the outer peripheral surface of the shaft 120 in a cylindrical shape. When performing an exposure operation on the photosensitive material, first, the photosensitive material starts to be fed at a constant speed by the upstream conveying roller pair, and the exposure starts when the leading edge of the photosensitive material reaches the exposure point. When the roller enters the downstream conveying roller pair, the downstream pressure roller is set in a pressure-released state by operating the swing arm in advance, and the downstream end of the downstream roller after entering between the downstream conveying roller pair. The operation of switching the pressure roller to the pressure-bonded state and continuing the exposure is performed. By performing such an operation, the impact when the leading edge of the photosensitive material collides with the crimping portion of the downstream conveyance roller pair disturbs the photosensitive material conveyance speed, which is the main scanning direction in the finished photographic print. It tries to prevent it from appearing as a defect such as a streaky line extending as far as possible.
Japanese Patent Laid-Open No. 2002-23273 (paragraph numbers [0003], [0033], [0038] to [0041], FIGS. 2 to 5)

  However, in the exposure apparatus disclosed in Patent Document 1, banded defects may still be found in the finished photographic print despite the above measures.

  Accordingly, an object of the present invention is to provide an exposure apparatus in which defects such as banding are less likely to occur in a finished photo print in view of the above-mentioned drawbacks of the exposure apparatus according to the prior art exemplified above.

A first characteristic configuration of the present invention includes an exposure engine having an exposure axis extending in a main scanning direction, and a pair of conveying rollers for conveying a photosensitive material in a sub-scanning direction intersecting the main scanning direction,
The conveying roller pair includes a driving roller that is rotationally driven by a driving source, and a pressure-bonding roller that is supported in an idle manner.
The pressure roller is an exposure apparatus provided to be switchable between a pressure-bonding state in which a photosensitive material is pressed against the driving roller and a pressure-release state in which the pressing is released,
The press roller has a shaft extending in parallel with the main scanning direction, and a roller body supported on the peripheral surface of the shaft so as to be freely rotatable.
Therefore, in the exposure apparatus according to the first characteristic configuration of the present invention, the pressure roller includes a shaft extending in parallel with the main scanning direction, and a roller body that is supported on the peripheral surface of the shaft so as to be freely rotatable. Therefore, at the moment when the pressure roller is switched from the pressure-released state to the pressure-bonded state, the effect of trying to hold down the photosensitive material being conveyed toward the downstream side by inertia is the free rotation on the shaft. It is only the roller body that is freely supported, and the inertia of the shaft having a large mass is not involved in such an action. Therefore, in the exposure apparatus according to the prior art, the entire structure of the solid shaft and the outer peripheral surface made of an elastic material provided so as to rotate integrally with the outer periphery of the shaft has an inertia to hold the photosensitive material. Thus, since the impact of the photosensitive material is reduced at the moment when the pressure roller is switched to the pressure-bonded state, defects such as banding are less likely to occur in the finished photo print.

According to a second characteristic configuration of the present invention, the roller body is made of a cylindrical and rigid core member supported on a peripheral surface of the shaft via a bearing, and an elastic material provided on an outer periphery of the core member. And an annular gap is formed between the inner surface of the core member and the peripheral surface of the shaft.
Therefore, in the exposure apparatus according to the second characteristic configuration of the present invention, the outer shape of the photosensitive material support is held in a correct cylindrical shape by the rigid core member, regardless of being made of an elastic material. The mass of the roller body is further reduced by the amount of the annular gap formed between the shaft and the peripheral surface of the shaft, so that the photosensitive material being conveyed, which is exerted by the roller body, tries to hold it by inertia. Is further reduced, and defects such as banding are less likely to occur in the finished photo print.

According to a third characteristic configuration of the present invention, the roller main body includes a plurality of roller main bodies arranged along the main scanning direction on a peripheral surface of one shaft, and the plurality of roller main bodies are independent of each other. And is provided so as to be rotatable.
Therefore, in the exposure apparatus according to the third characteristic configuration of the present invention, when transporting a narrow photosensitive material such as an L plate, for example, only a part of the plurality of roller bodies presses the photosensitive material against the driving roller. However, since the remaining roller body does not come into contact with the photosensitive material, at the moment when the pressure-sensitive roller is switched from the pressure-released state to the pressure-bonded state, it is possible to exert an action to hold the photosensitive material being conveyed by inertia. When the photosensitive material having a narrow width is conveyed, defects such as banding are less likely to occur in the finished photographic print.

  Other features and advantages of the present invention will become apparent from the following description of embodiments using the drawings.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram of a photographic printing apparatus provided with an exposure apparatus according to the present invention. This photographic printing apparatus is also referred to as a digital minilab, and performs an exposure processing unit Ex that exposes a silver salt type photographic paper P (an example of a photosensitive material), and develops the photographic paper P thus exposed. A development processing unit De and a drying processing unit Dr for drying the photographic paper P after the development processing are housed in a housing 10.
A belt transport mechanism 11 is provided outside the housing 10 to sort the photographic paper P as a finished print sent out from the drying processing unit Dr in the horizontal direction in units of orders and accumulate them in a sorter (not shown). . Although not shown in the drawing, the exposure processing unit Ex transmits image information captured by photoelectrically converting a frame image of a photographic film by a film scanner or image information taken by a digital camera to the photographic printing apparatus. Thus, an exposure operation is performed on the photographic paper P based on the image information.

  The exposure processing unit Ex cuts the roll-shaped photographic paper P stored in one of the two photographic paper magazines M, M into a print size by the supply unit U1, conveys it upward, and prints supplied from the supply unit U1. In the exposure conveyance unit U2 (an example of an exposure apparatus), image information is exposed while vertically conveying the paper P from below to above, and the photographic paper P sent further upward from the exposure conveyance unit U2 is transferred to the front roller unit. In U3, the conveyance direction is changed to the horizontal direction, and then the distribution unit U4 feeds it in the horizontal direction, and then transfers it from the rear roller unit U5 to the development processing unit De.

The supply unit U1 moves upward while sandwiching the photographic paper P with a plurality of conveyance roller pairs 13 for conveying the photographic paper P from the photographic paper magazine M, a cutter 14 for cutting the photographic paper P into a predetermined print size. A chuck mechanism 15 is provided. Next, the exposure transport unit U2 includes a laser scanning type exposure engine 17 as an exposure unit so as to expose the photographic paper P while transporting the photographic paper P from below by the transport mechanism. . In addition, the roller unit U3 includes a plurality of transport rollers 18 that are arranged to be switched between a crimped state and an open state in a curved transport path. The sorting unit U4 is juxtaposed along the two chucker CHs (in FIG. 1, the penetrating direction of the paper surface) with the photographic paper P supplied in a row from the roller unit U3 sandwiched between the sorting units U4. ). The rear roller unit U5 includes a plurality of pressure rollers 19 that convey the photographic paper P sorted by the sorting unit U4 along two rows of sorting paths.
The development processing unit De includes a plurality of development processing tanks 20 including a color developing tank, a bleach-fixing tank, and a stabilization tank, and each of the development processing tanks 20 has a number of pressure rollers to supply the photographic paper P. A transport unit 21 is provided. In addition, the drying processing unit Dr includes a conveyance path that supplies the drying air sent from the blower 22 to the photographic paper while heating.

  As shown in FIGS. 2 and 3, the exposure transport unit U2 is supported by a main frame F1 mainly made of a metal material such as aluminum, and is separably supported with respect to the main frame F1, and is also made of a metal such as aluminum. And a movable frame F2 made of a material. The main frame F1 is provided with a reference plate 25 having a precise flat surface for guiding the substrate surface side of the photographic paper P. On the other hand, a guide body G for guiding the photosensitive surface side of the photographic paper P is provided on the movable frame F <b> 2 so as to face the reference plate 25. The movable frame F2 is fixed with a holding mechanism (not shown) such as a buckle in such a manner that the connecting shaft 26 formed at the lower end is engaged with the concave portion 27 on the main frame side and the upper end is pulled toward the main frame F1. The reference plate 25 and the guide body G are configured to be held in a mutually parallel positional relationship. A gap formed between the reference plate 25 and the guide body G constitutes a conveyance path for conveying the photographic paper P in the vertical direction.

Further, the exposure transport unit U2 includes transport means for transporting the photographic paper P in the sub-scanning direction with respect to the transport path, and with respect to the photosensitive surface of the photographic paper P sent to the exposure position X by the transport means. Then, exposure in a line shape in the main scanning direction is performed by the laser beam LB from the exposure engine 17. Incidentally, the exposure engine 17 adjusts the amount of light of the laser beam LB from the laser light sources of the three primary colors R (red), G (green), and B (blue) housed in the casing by an acousto-optic modulation means. A structure is used in which the light is reflected on the mirror surface of a polygon mirror that rotates about the axis and is sent to the exposure position X while being scanned in the main scanning direction. In addition, as the exposure head, a DMD (digital mirror device) system, a liquid crystal shutter system, a PLZT shutter system, a fluorescent beam system, and the like can also be employed.
The guide surface 25S on the side of the reference plate 25 that contacts the photographic paper P is colored black by plating or the like in order to prevent reflection of light. The guide body G further includes a front guide body 31 disposed upstream of the exposure position in the conveyance direction of the photographic paper P, a central guide body 32 disposed at the exposure position X, and a downstream side of the exposure position X. The rear guide body 33 is arranged.

  At the lower position of the main frame F1, a press-fitting type introduction roller R0 for receiving the photographic paper P sent from the chuck mechanism 15 is provided. The introduction roller R0 includes a main roller 35 that is driven to rotate, and a sub-roller 36 that can be switched to a pressure-bonding position that is pressure-bonded to the main roller 35 and a release position that is separated from the main roller 35. The driving force of the stepping motor type introduction motor 37 is transmitted through the speed reduction mechanism 38, and the sub-roller 36 is configured to be switched between a crimping position and an opening position by the operation of the actuator 39.

  The transport means feeds the photographic paper P supplied from the introduction roller R0 to the exposure position X from the first transport roller pair R1 and the first transport roller pair R1 arranged upstream from the exposure position X. It is composed of a second conveying roller pair R2 disposed downstream from the exposure position so as to further feed the photographic paper. The first transport roller pair R1 is composed of a drive roller 41 and a pressure roller 42 that is rotated by being crimped to the drive roller 41. Similarly, the second transport roller pair R2 is composed of the drive roller 51 and the drive roller 51. The pressure roller 52 rotates in a driven manner by being pressure-bonded to the drive roller 51.

  As shown in FIGS. 2 and 3, each of the drive rollers 41 and 51 of the first and second transport roller pairs R1 and R2 is composed of one long and solid metal shaft 41A and 51A, and this shaft. The plurality of cylindrical roller portions 41B and 51B integrally formed on 41A and 51A, and the plurality of roller portions 41B and 51B are spaced apart from each other along the shaft cores of the shafts 41A and 51A. The shafts 41A and 51A are supported on the main frame F1 so as to be freely rotatable. The roller portions 41B and 51B are made of a metal material such as aluminum, and a ceramic material is coated in a film shape on the outer peripheral surface thereof. An opening exposing a part of the outer peripheral portion of the roller portions 41B and 51B is formed in the reference plate 25, and the outer peripheral portion of the roller portions 41B and 51B is guided through the opening to the guide surface 25S of the reference plate 25. The drive rollers 41 and 51 are supported so as to be in a positional relationship slightly projecting from the transport path side. Further, a stepping motor type conveyance motor 60 is provided on the main frame F1 side, and the driving force from the conveyance motor 60 is supplied to the drive roller 41 via a speed reduction transmission system composed of a first endless belt 61 and a second endless belt 62. , 51 is transmitted.

  A pair of operation shafts 43 and 53 extending in parallel with the shafts 41A and 51A of the first and second transport roller pairs R1 and R2 are rotatably supported on the movable frame F2. As shown in FIG. 3, two first swing arms 44 and one second swing arm 45 are fixed to the upstream operation shaft 43 so as to swing together. Two first swing arms 54 and one second swing arm 55 are also fixed to the operation shaft 53 on the downstream side so as to swing integrally. As shown in FIG. 3, the shaft 42 </ b> A of the pressure roller 42 is idled via a ball bearing 70 between the swing ends of the two first swing arms 44 extending from the upstream operation shaft 43. It is supported. The shaft 52A of the pressure roller 52 is also supported by free rotation via a ball bearing 70 between the respective swing ends of the two first swing arms 54 extending from the operation shaft 53 on the downstream side (FIG. 4). See also). Further, a roller-type cam follower 46 is idled on the swing end of the second swing arm 45 extending from the upstream operation shaft 43, and the second swing arm extending from the downstream operation shaft 53 is supported. A roller-type cam follower 56 is loosely supported on the swing end of the arm 55. Rotating cams 47 and 57 contacting the cam followers 46 and 56 are rotatably supported by the main frame F1, and the rotating cams 47 and 57 are stepping motors via belt transmission mechanisms 49 and 59, respectively. The cam motors 48 and 58 are configured to be rotated by a driving force. The pair of operating shafts 43 and 53 are always urged by a torsion coil spring (not shown) or the like so that the cam followers 46 and 56 are pressed against the peripheral surfaces of the rotating cams 47 and 57.

Therefore, if the rotation angles of the rotary cams 47 and 57 are appropriately operated by the cam motors 48 and 58, the positions of the cam followers 46 and 56 pressed against the peripheral surfaces of the rotary cams 47 and 57 are displaced, and the second The swing arms 45 and 55 and the operation shafts 43 and 53 are rotated. As a result, the shafts 42A and 52A supported between the swing ends of the two first swing arms 44 and 54, Since the drive rollers 41 and 51 are moved and moved in the approaching / separating direction, the pressure-bonding rollers 42 and 52 are switched between a pressure-bonded state in which the drive rollers 41 and 51 are pressure-bonded and a pressure-released state in which the pressure-release is released. .
As shown in FIG. 3, each of the pressure rollers 42 and 52 includes the shafts 42A and 52A described above, and a plurality (specifically four) of the rollers 42 and 52A supported on the peripheral surfaces of the shafts 42A and 52A. It has roller main bodies 42B and 52B. The plurality of roller bodies 42B and 52B are disposed at positions facing the plurality of roller portions 41B and 51B of the drive rollers 41 and 51, respectively. Here, since the upstream pressure roller 42 and the downstream pressure roller 52 have the same configuration, the downstream pressure roller 52 will be described in detail below.

  That is, as shown in FIG. 4, each of the plurality of roller main bodies 52 </ b> B is integrally provided on the outer periphery of the cylindrical and rigid core member 63 made of an aluminum alloy or the like (with the core member). And a photosensitive material support 64 made of an elastic material (by insert molding or bonding with an adhesive). The core member 63 is supported on the peripheral surface of the shaft 52A via a pair of ball bearings 71 fitted at both ends thereof, and an annular gap is formed between the inner surface of the core member 63 and the peripheral surface of the shaft 52A. S is formed, which helps to reduce the weight of the roller body 52B. The plurality of roller bodies 52B are separated from each other by sleeves 72 made of an aluminum alloy or the like externally fitted as a spacer on the peripheral surface of the shaft 52A. The sleeve 72 is in contact with the inner race of each ball bearing 71, so that the position of each roller body 52B on the shaft 52A is kept substantially constant.

  Since it has the above configuration, the plurality of roller main bodies 52B can rotate relative to each other on the shaft 52A, in other words, can rotate independently of each other. As a result, as shown in FIG. 5A, when an exposure operation is performed on a photographic paper P having a small width such as an L size (width: 89 mm × feed length: 127 mm), Only the two closer to the center press the photographic paper P to the roller portion 51B of the driving roller 51, and the two roller bodies 52B at the left and right end portions do not contact the photographic paper P and basically do not rotate. Therefore, at the moment when the pressure-bonding roller 52 is switched from the pressure-released state to the pressure-bonded state, the two roller main bodies near the center also exert an action to hold the photographic paper P being conveyed by inertia. In particular, when transporting a narrow photographic paper P such as an L plate, defects such as banding are less likely to occur in the finished photo print. On the other hand, as shown in FIG. 5B, for example, when performing an exposure operation on a wide photographic paper P such as six pieces (width: 203 mm × feed length: 254 mm), all of the four roller bodies 52B are used. Presses the photographic paper P to the roller portion 51B of the driving roller 51. When transporting any size of photographic paper, the roller body on the shaft 52A is rotated synchronously with the drive roller by close contact with the photographic paper since the pressure roller 52 is switched to the pressure-bonded state. The shaft 52A itself is basically not rotated.

  It should be noted that the cam cores 46 and 56 are basically disposed on or very close to the axis of the pressure-bonding rollers 42 and 52. When the movable frame F2 is separated from the main frame F1, the cam followers 46 are arranged. 56 and the rotary cams 47 and 57 are separated. Further, when the exposure transport unit U2 is assembled, the second swing arms 45, 55 and the first swing arm 44, If the relative angle with respect to 54 is changed, the timing at which the pressure-bonding state of the pressure-bonding rollers 42 and 52 is switched and the pressure-bonding force can be finely adjusted individually.

  As shown in FIGS. 2 and 3, the central guide body 32 is formed by forming a slit-like opening 32A parallel to the main scanning direction at the center position of a bar-like member made of aluminum or the like and parallel to the main scanning direction. The both ends of the central guide body 32 are supported by holders (not shown) so as to be able to approach and separate in a direction perpendicular to the guide surface 25S of the reference plate 25. Further, the central guide body 32 is colored black so as to suppress the reflection of light rays on the surface facing the reference plate 25 and the inner surface of the opening 32A.

Although the control system is omitted, the exposure transport unit U2 transports the printing paper P according to the following control.
As shown in FIG. 6A, first, when the photographic paper P sandwiched by the chuck mechanism 15 of the supply unit U1 is received by the exposure transport unit U2, the sub roller 36 of the introduction roller R0 is set to the open position. The leading end portion of the photographic paper P sandwiched between the chuck members 15a and 15a of the chuck mechanism 15 is allowed to be introduced into the introduction roller R0. Next, as shown in FIG. 6B, by setting the sub roller 36 at the press-bonding position, the main roller 35 and the sub roller 36 press the vicinity of the front end of the photographic paper P, and then the chuck mechanism 15 The clamping by the chuck members 15a and 15a is released, and after this release, the introduction roller R0 is driven to start conveying the photographic paper P upward. By this conveyance, the photographic printing paper P is guided while the base material side contacts the reference plate 25, and the photosensitive surface side is guided toward the front guide body 31 toward the first conveyance roller pair R <b> 1.

The driving rollers 41 and 51 of the first and second conveying roller pairs R1 and R2 are already driven to rotate at a peripheral speed synchronized with the introduction roller R0 before the photographic printing paper P approaches. Then, as shown in FIG. 6C, before the leading end of the photographic paper P reaches the portion of the first conveyance roller pair R1 based on the conveyance of the photographic paper P by the introduction roller R0, the first conveyance roller pair in advance. Control is performed to hold the pressure-bonding roller 42 of R1 in the pressure-released state. Then, as shown in FIG. 6D, when the leading end of the photographic paper P reaches a position where the conveyance by the first conveyance roller pair R1 is possible, the pressure roller 42 (in a stationary state not rotating) is in a pressure-bonded state. Is controlled by pressing the photographic paper P with the driving roller 41 and the pressure roller 42 of the first conveying roller pair R1 and starting the conveyance by the first conveying roller pair R1. The leading end is reliably received between the first conveying roller pair R1. Then, as shown in FIG. 6D, after the conveyance by the first conveyance roller pair R1 is started, the sub roller 36 of the introduction roller R0 is controlled to be switched to the release position, thereby introducing the photographic paper P. No external force is applied from the roller R0 side.
Further, after the conveyance of the photographic paper P is started by the first conveyance roller pair R1, it is introduced between the reference plate 25 and the central guide body 32 immediately before the leading edge of the photographic paper P reaches the exposure position X. When the exposure is started, the exposure is started in a state where the inconvenience that the printing paper P is lifted from the reference plate 25 is suppressed by the central guide body 32.

  Next, as shown in FIG. 6E, before the leading edge of the photographic paper P whose exposure to the photographic paper P has started at the exposure position X reaches the second conveying roller pair R2, the second conveying roller pair R2 Control is performed to hold the pressure roller 52 in the pressure released state, and when the leading edge of the photographic paper P enters between the second conveying roller pair R2, as shown in FIG. The pressure roller 52 that is not in a stationary state is switched to the pressure-bonded state (in the conventional pressure roller configuration, the conveyance speed of the photographic paper P is disturbed at the moment of switching to the pressure-bonded state, resulting in defects such as banding. ) Under control, the photographic printing paper P is pressure-bonded by the driving roller 51 and the pressure roller 52 of the second conveying roller pair R2, and the conveying of the photographic printing paper P is started by the second conveying roller pair R2. Later, at the appropriate time By performing control to switch the pressure roller 42 of the roller pair R1 to the pressure released state, an impact when the trailing edge of the photographic paper P comes out of the first conveying roller pair R1 held in the pressure-bonded state is applied to the photographic paper P. This prevents the transfer speed from being affected.

  Note that the switching operation between the pressure-released state and the pressure-bonded state for the sub-roller 36 and the pressure-bonding rollers 42 and 52 is performed by controlling the actuator 39 of the sub-roller 36 constituting the introduction roller R0 and the pressure-bonding rollers 42, This is implemented by rotation control of cam motors 48 and 58 that rotate the rotary cams 47 and 57 that determine the posture of the cam 52.

[Another embodiment]
The pressure-bonding rollers of the first and second transport roller pairs R1 and R2 may be implemented with a configuration illustrated in FIG. Only the pressure roller 152 of the second conveyance roller pair R2 on the downstream side will be described. This pressure roller 152 is freely rotatable around the free end of the swing arm 54 via the ball bearing 70, as with the shaft 52A. And a long and single roller body 152B that is supported on the peripheral surface of the shaft 152A so as to be freely rotatable. The roller body 152B is integrally provided on the outer periphery of a cylindrical and rigid core member 163 made of an aluminum alloy or the like and the enormous portion 163a formed at four positions of the core member 163 (insert molding with the core member or And a photosensitive material support 164 made of an elastic material (by bonding with an adhesive). The core member 163 is supported on the peripheral surface of the shaft 152A via a pair of ball bearings 171 fitted at both ends thereof, and an annular gap is formed between the inner surface of the core member 163 and the peripheral surface of the shaft 152A. S ′ is formed, which helps to reduce the weight of the roller body 152B. The plurality of photosensitive material supports 164 are disposed at positions facing the plurality of roller portions 51B of the driving roller 51, respectively. Also in this configuration, only the roller main body 152B on the shaft 152A is operated to rotate synchronously with the drive roller 51 by the close contact with the photographic paper since the pressure-bonding roller 152 is switched to the pressure-bonded state. The 152A itself does not basically rotate.

Longitudinal side view of photo printing device Sectional drawing which shows the main frame and movable frame which comprise the conveyance path | route of an exposure conveyance unit Perspective view showing exposure transport unit Sectional view showing a part of the pressure roller of the exposure transport unit Explanatory drawing showing the relationship between photographic paper of each size and pressure roller Schematic diagram showing the transport sequence of photographic paper with respect to the transport path of the exposure unit Sectional drawing which shows a part of press-bonding roller by another embodiment Sectional view showing a part of a conventional pressure roller

Explanation of symbols

P Photographic paper (photosensitive material)
X exposure position F1 main frame F2 movable frame 25 reference plate G guide body R1 first transport roller pair R2 second transport roller pair 41, 51 driving roller 42, 52 pressure roller 42A, 52A shaft 42B, 52B roller body 43, 53 operation Shafts 44, 54 First swing arm 45, 55 Second swing arm 46, 56 Cam follower 47, 57 Rotating cam 63 Core member 64 Photosensitive material support 71 Ball bearing 72 Sleeve

Claims (3)

An exposure engine having an exposure axis extending in the main scanning direction, and a pair of conveying rollers for conveying the photosensitive material in the sub-scanning direction intersecting the main scanning direction,
The conveying roller pair includes a driving roller that is rotationally driven by a driving source, and a pressure-bonding roller that is supported in an idle manner.
The pressure roller is an exposure apparatus provided to be switchable between a pressure-bonding state in which a photosensitive material is pressed against the driving roller and a pressure-release state in which the pressing is released,
An exposure apparatus, wherein the pressure roller includes a shaft extending in parallel with the main scanning direction, and a roller body that is supported on the peripheral surface of the shaft so as to be freely rotatable.   The roller body has a cylindrical and rigid core member supported on a peripheral surface of the shaft via a bearing, and a photosensitive material support made of an elastic material provided on the outer periphery of the core member, The exposure apparatus according to claim 1, wherein an annular gap is formed between an inner surface of the core member and a peripheral surface of the shaft.   The roller main body includes a plurality of roller main bodies arranged along the main scanning direction on a peripheral surface of one shaft, and the plurality of roller main bodies are rotatably provided independently of each other. Item 3. The exposure apparatus according to Item 1 or 2.

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