JPH08146536A - Laser imager - Google Patents

Abstract

PURPOSE: To provide a laser imager of which the constitution is simple, the film can be uniformly fed, and the miniaturization is possible. CONSTITUTION: This laser imager is provided with guides 45,46 guiding a sheet carried from the nearly upper side into the nearly horizontal direction, an exposure first roller 19 provided on the horizontal part of the guides 45, 46 and rotationally driven, a first exposure roller 19' provided capably of being contacted with the exposure first roller 19, an energization part 43 energizing the exposure first roller 19' onto the exposure first roller 19 side, and an energizing force adjusting means 39, 41, writing is carried out after passing the exposure first roller 19, and the energizing force adjusting means 39, 41 is constituted so that the energizing force of the roller 19' to the roller 19 is intensified through the energization part 43, until the rear end part of the carried sheet reaches the horizontal part of the guides 45, 46.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an X-ray CT (Computed Tomog)
The present invention relates to a laser imager that forms a visible image on a film (photographic photosensitive material) using a laser from image data output from a raphy) device or an MR (Magnetic Resonance) device.

[0002]

2. Description of the Related Art FIG. 12 is a block diagram of a writing section of a conventional laser imager. In the figure, 100 is a sheet 10
The sheet 10 is provided on the upstream side in the transport direction of sheet 1.
1 is a first roller pair that nips and conveys 1 in the sub-scanning direction. 1
Reference numeral 02 denotes a second roller pair that is provided on the downstream side in the transport direction of the sheet 101 and that sandwiches and transports the sheet 101.

Reference numeral 103 is a guide for horizontally guiding the sheet 100. Then, the laser beam 105 is applied to the sheet 101 between the first roller pair 100 and the second roller pair 102.
Are driven in the main scanning direction (direction perpendicular to the paper surface in FIG. 12), and an image is written on the sheet 101.

In the laser imager having such a structure, in order to obtain a high quality image, it is necessary to convey the sheet 101 at a constant speed and to feed it without unevenness. The impact generated when the sheet 101 is nipped by the roller pair and the impact generated when the sheet 101 is separated from the roller pair cause load fluctuation of the sheet conveyance and cause uneven feeding of the sheet 101.

Therefore, after the front end portion of the sheet 101 is nipped by the second roller pair 102, the holding force of the first roller pair 101 is weakened, and the rear end portion of the sheet 101 is held by the first roller pair 100.
I try to weaken the impact when leaving.

[0006]

However, in order to reduce the size of the laser imager having the above structure in the width direction of the apparatus, as shown in FIG. 13, a guide 104 for guiding the sheet 101 horizontally from above is used. The sheet 101 conveyed from above is immediately written.

Since the sheet 101 has elasticity, when it is guided by a guide 104 having a shape as shown in FIG.
When writing on the front end of the sheet 101, the rear end side of the sheet 101 is elastically deformed in an arc shape. Therefore, due to the elastic restoring force generated on the rear end side of the sheet 101, the rear end side of the sheet 101 presses the guide 104, and the conveyance resistance (sliding frictional force) from the laser imager configured as shown in FIG.
Grows larger.

Therefore, as in the laser imager shown in FIG. 12, the front end portion of the sheet 101 has the second roller pair 102.
If the nipping force of the first roller pair 101 is weakened after being nipped by the sheet, the rear end of the sheet 101 may press the guide 104 in some cases, and the sheet 101 cannot be fed at a constant speed evenly. There is a point.

An object of the present invention is to provide a laser imager which can be miniaturized and which can smoothly convey a sheet.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a guide for guiding a sheet conveyed from above in a substantially horizontal direction, and an exposure unit provided at a substantially horizontal portion of the guide and rotationally driven. 1 roller, a 1'exposure roller provided so as to be capable of contacting the exposure 1st roller, a biasing means for biasing the exposure 1'roller to the exposure 1st roller side, and the biasing means. A laser imager in which writing is performed after the first exposure roller, the biasing force adjusting unit adjusting the biasing force of the biasing unit. The urging force of the urging means is made larger than the urging force when the sheet separates from the exposure first and exposure first 'rollers until the portion reaches the horizontal portion of the guide. is there.

As an example of the urging force adjusting means, a cam that rotates in synchronization with the driving of the exposure first and second exposure rollers and a base end portion are rotatably provided, and the rotation end portion slides on the cam. There is a cam follower in contact with the cam follower. One example of the biasing means is that one end is locked to the exposure first 'roller side and the other end is locked to the cam follower.
There is a spring for pressing the exposing first 'roller against the exposing first roller and pressing the cam follower against the cam.

Further, in order to obtain smooth conveyance, the guide includes a first guide plate extending in a substantially vertical direction and the first guide plate.
And a second guide plate that is connected to the guide plate and is curved in the direction of the exposure first roller, and the first and second guide plates are provided.
It is preferable that the connecting portions of the guide plates are comb-shaped to engage with each other.

Further, in order to enable miniaturization, the laser imager is provided on a supply magazine in which unexposed sheets are stored, and above the supply magazine.
A supply first roller pair that nips and conveys a sheet, a pickup unit that picks up the sheet from the supply magazine, and passes a front end portion of the sheet to the first supply roller pair, and a sheet that is picked up by the pickup unit. A supply guide that guides to a first roller, a turn guide that guides a sheet that is sandwiched and conveyed by the first supply roller pair to the guide plate, and a supply guide that is provided at the end of the turn guide and that clamps and conveys the sheet. And a pair of two rollers, the end of the turn guide is shaped such that the distance from the supply second roller is gradually shortened from both sides toward the center, or the end of the turn guide is formed. The shape is such that the distance from the supply second roller gradually increases from one side to the other side. It is desirable to or shorter.

In order to obtain smooth conveyance, a comb tooth portion in which concave portions and convex portions are alternately provided is formed at the end of the supply guide, and the turn guide has a comb tooth portion of the supply guide. It is desirable to form a hole with which the convex portion engages.

[0015]

According to the structure of the present invention, when the front end portion of the sheet comes into contact with the first exposure roller and the first exposure roller, the writing is not yet started, so that the image formation is not affected.

At the time when the front end of the sheet is nipped and conveyed by the exposure first and first 'rollers, the rear end side of the sheet is guided by the vertical portion of the guide, so that the conveyance resistance is large,
The biasing force adjusting means strengthens the biasing force of the biasing means. This state continues until the trailing edge of the sheet reaches the horizontal portion of the guide.

When the trailing edge of the sheet reaches the horizontal portion of the guide, the conveyance resistance decreases, so that the urging force adjusting means applies the first exposure roller to the first exposure roller via the urging portion. Weaken the power.

Therefore, by increasing the biasing force of the first exposure roller to the first exposure roller until the trailing edge of the sheet reaches the horizontal position, the guide for guiding the sheet conveyed from above substantially in the horizontal direction. Even if the writing is performed after the exposure first and exposure first 'rollers provided on the horizontal portion of the guide, the sheet can be smoothly conveyed, and the laser imager can be downsized. It is possible to plan.

Further, when the trailing edge of the sheet reaches the horizontal portion of the guide, the urging force of the exposing first 'roller on the exposing first roller is weakened so that the trailing edge of the sheet is exposed to the exposing first' roller and exposing first roller. It prevents the occurrence of impact when the roller is separated from the roller.

Further, since the connecting portions of the first and second guide plates of the guide are in the shape of comb teeth which engage with each other, the step of the connecting portions does not occur, the sheet is smoothly conveyed, and the film Eliminates uneven feeding.

Similarly, the end shape of the turn guide is gradually shortened from the both sides toward the center of the supply second roller, or the distance from the supply second roller is reduced from one side. By gradually shortening toward the other side, the rear end of the curved sheet moves to the second position.
It prevents bouncing when transferring to the supply roller, which enables downsizing of the device and smooth transportation.

Further, a comb tooth portion in which concave portions and convex portions are alternately provided is formed at the end of the supply guide, and a hole in which the convex portion of the comb tooth portion of the supply guide engages is formed in the turn guide. As a result, a step does not occur at the connection portion between the supply guide and the turn guide, the sheet is smoothly conveyed, and uneven feeding of the film is eliminated.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining a main configuration of a print unit of the embodiment, FIG. 2 is an overall configuration diagram of a laser imager of the present embodiment, and FIG. 3 is a connecting portion between a first guide plate and a second guide plate in FIG. And FIG. 4 is a perspective view of the third guide in FIG.

First, the overall structure of the laser imager 1 of this embodiment will be described with reference to FIG. In the figure, a laser imager 1 includes a supply unit 2 for storing an unexposed film as a sheet, a print unit 3 for writing an image on the film conveyed from the supply unit 2, and a receiver for storing the exposed film. A unit 4 and a power supply section 6 for supplying electricity to each of these units,
The control unit 7 controls each of these units.

The supply unit 2 is constructed by stacking a supply magazine 10 for storing unexposed film. Therefore, the supply module 11 can be added according to the size of the film used.

Each module 11 has a suction cup 1 for picking up unexposed film from the supply magazine 10.
2, Supply first roller pair 13,1 that holds the picked up film and pulls it out from the supply magazine 10.
3 ', a turn guide 14 for guiding the film pulled out by the supply first roller pair 13, 13' toward the lower surface of the supply unit 2, a supply second roller pair 15, 15 'for conveying the film to the outside of the supply unit 2, Supply the film transported from the supply module 11 Second
A flat guide 16 is provided to guide the roller pair 15, 15 '.

Next, the print unit 3 will be described. An optical unit 18 for irradiating the film in the scanning direction with a laser beam 17 modulated according to image data externally supplied to the laser imager 1 is provided above the print unit 3. Below the print unit 3, an exposure first roller 19 and an exposure first'roller 19 'that sandwich the film conveyed from the supply unit 2 and convey it in the sub-scanning direction, and a length of the conveyed film in the conveying direction. Exposure second roller 2 arranged at a shorter interval
0, exposure second 'roller 20' is provided. The writing with the laser beam 17 is performed by the exposure first and second rollers 1
It will take place between 9 and 20.

The distance between the second exposure roller 20 and the second exposure roller 20 'is set to be slightly smaller than the thickness of the film at least in the area facing the conveyed film. Further, the exposure second 'roller 20' is manufactured with a hollow roller structure or a lightweight material, so that the weight is reduced.

Reference numeral 21 denotes a film aligning roller for aligning the front end of the film conveyed from the supply unit 2 to align the film, and 22 denotes a film resetting guide for conveying the exposed film to the receive unit 4. It's Laura.

The receive unit 4 is provided with a receive magazine 23 for storing the exposed film. Reference numeral 24 denotes a transport unit including a transport roller and a guide for sandwiching and transporting the film transported from the print unit 3 to the receive magazine 23.

Next, the print unit will be described in detail with reference to FIG. The exposure first 'roller 19' is rotatably provided on the rotation end side of the first arm 30 whose base end is rotatably provided, and can come into contact with the exposure first roller 19. Similarly, the exposure second 'roller 20' is also rotatably provided on the rotation end side of the second arm 31 whose base end is rotatably provided, and can come into contact with the exposure second roller 20. There is.

On the upstream side of the first exposure roller 19, a third arm 32 having a rotatable central portion is provided.
A film reset guide roller 22 and a pin 33 are provided on one rotating end of the third arm 32.
Pre-alignment rollers 21 are provided at the other rotation ends.

Next, the biasing force adjusting means will be described. On the same axis as the first exposure roller 19, a flywheel-pulley 34, which is rotationally driven by a pulse motor (not shown) via a flat belt, is fixed. Further, the second exposure roller 20 is connected to the first exposure roller 19 via the flat belt 35.
It is designed to be driven with.

Reference numeral 36 is a shaft which is rotationally driven by a motor 38 via a belt 37. The motor 38 is driven in synchronization with a motor that drives the first and second exposure rollers 19 and 20. Further, a first cam 39 and a second cam 40 are fixed to the shaft 36.

Reference numeral 41 denotes a first cam follower whose base end portion is rotatably provided and whose rotation end portion is in sliding contact with the first cam 39.
Reference numeral 42 is a second cam follower whose base end is rotatably provided, one of which is in sliding contact with the second cam 40 and the other of which is in contact with the pin 33 of the third arm 32.

One end of 43 is locked to the first arm 30 and the other end is locked to the first cam follower 41 to press the exposure first 'roller 19' against the exposure first roller 19 and The rotating end of the first cam follower 41 is
Is a spring as a biasing portion for pressing the cam 39 of FIG.

The first cam 39 rotates the first cam follower 41 in the clockwise direction in the drawing before the trailing ends of the film are separated from the exposure first and first 'rollers 19 and 19'. The shape is set so that the biasing force of 43 is weakened and the pressing force of the first exposure roller 19 'on the first exposure roller 19 is weakened.

Reference numeral 45 denotes a first guide plate extending in a substantially vertical direction for guiding the film conveyed from the supply unit 2, and 46 is provided continuously with the first guide plate 45, curved in the horizontal direction, and exposed. A second guide plate that guides the film toward the first roller 19 and a third guide plate 47 that guides the film exiting the exposure second roller 20.

As shown in FIG. 3, the connecting portions of the first and second guide plates 45 and 46 are in the shape of comb teeth which engage with each other, so that no step is formed in the connecting portions. . Further, as shown in FIG. 4, the third guide plate 47 is processed into a corrugated plate shape to make a line contact with the film, thereby reducing the transport resistance of the film.

Reference numeral 50 is a motor for driving the pre-alignment roller 21 and for driving the transport system for transporting the exposed film. Reference numeral 51 denotes the first roller 1 that exposes the film conveyed from the supply unit 2 in cooperation with the pre-alignment roller 21.
Rollers for transporting in 9 directions, 52 for transporting the exposed film to the discharge system in cooperation with the roller 51, 5
Reference numerals 3 and 54 are manual discharge rollers for discharging the exposed film to the outside of the machine, and 55 and 56 are rollers for conveying the exposed film to the receiving unit 4. Reference numeral 57 is a pulley attached to the output shaft of the motor 50, and 58 and 59 are guide pulleys. 60 is a pulley 57, a roller 55,
Guide pulley 59, manual discharge roller 53, roller 5
1 and the guide pulley 58.

Reference numeral 61 is a discharge guide plate for guiding the exposed film to the receive unit 4. The discharge guide plate 61 is provided so as to be movable between a solid line position and a two-dot chain line position.
The exposed film which is nipped and conveyed by the guide is guided to the outside of the machine, and when it is at the position indicated by the solid line, the exposed film which is nipped and conveyed by the rollers 51 and 52 is moved by the roller 5
It is designed to guide in 5,56 directions.

Further, the aligning roller 21 is formed such that the diameter of the central portion is larger than the diameter of the end portion, and the film to be nipped and conveyed is conveyed in the direction orthogonal to the rotation axis of the roller. 70 and 71 are provided on the second guide plate 46, and
Is a conveyance roller for nipping and conveying the film guided by the guide plate 46 of FIG. Further, a sensor 72 such as a photo interrupter for detecting the trailing edge of the film is provided immediately after the transport rollers 70 and 71.

Next, the film take-out section of the supply module 11 will be described with reference to FIGS. 5 is a configuration diagram of the film take-out portion of the supply module in FIG. 2, FIG. 6 is a perspective view of the supply guide and the supply first roller in FIG. 5, and FIG. 7 is a diagram illustrating connection between the supply guide and the turn guide. FIG. 8 is an explanatory view of the terminal end portion of the turn guide in FIG.

In FIG. 5, reference numeral 80 designates the film picked up from the suction cup 12 and supplies the first roller pair 13,1.
It is a supply guide to 3 '. A film that is picked up by the suction cup 12 and is to be sandwiched by the supply first roller pair 13, 13 ′ comes into contact with the supply guide 80, and a plurality of films are sandwiched by the supply first roller pair 13. Film separation part 80 to prevent
a is formed.

In the supply first roller pair 13, 13 ', the supply first roller 13 is the supply first roller 1
The supply first roller 13 is urged in a direction in which the supply first roller 13 is brought into contact with the supply first roller 13 'by an urging means (not shown). Supply second
Also in the roller pair 15, 15 ′, the supply second roller 15 is provided so as to be able to approach / separate from the supply second roller 15 ′, and the supply second roller 15 becomes the supply second roller 15 ′ by an unillustrated urging means. It is biased in the contact direction.

Reference numeral 81 is a pin 82, which is provided on the main body side of the apparatus.
A guide hole 81a with which 83 is slidably engaged is formed,
It is a first lever provided so as to be movable in the direction of the supply first roller 13.

Reference numeral 90 designates a pin 84, which is provided on the main body side of the apparatus.
Two guide holes 84a, 84 with which 85 slidably engages
b is a second lever provided so as to be movable in the direction of the supply second roller 15.

Reference numeral 86 is a fan-shaped cam which is rotationally driven by a drive motor (not shown). On the other hand, the first and second levers 81 and 84 are provided with cam followers 87 and 88 which are in sliding contact with the fan-shaped cam 86, respectively.

Therefore, when the drive motor (not shown) is driven to rotate, the fan-shaped cam 86 rotates, and the first lever 81 and the second lever 84 move toward the supply first roller 13 and the supply second roller 15, respectively. The supply first roller 13 and the supply second roller 15 are moved in the direction away from the supply first roller 13 'and the supply second roller 15' against the urging force of the urging means.

Next, referring to FIG. 6, the supply guide 80
A plurality of holes 80b are formed in the width direction of the supply first roller 13, the supply first roller 13 is fitted in the hole 80b of the supply guide 80, and connects the large diameter portion 13a and the large diameter portion 13a which are in contact with the supply first roller 13 '. And a small diameter portion 13b.

At the terminal end of the supply guide 80, a comb tooth portion 80a in which concave portions and convex portions are alternately formed is formed, and the comb tooth portion 80a is, as shown in FIG.
4 are engaged with a plurality of holes 14a formed in the width direction.

Further, as shown in FIG. 8 (a), the end portion of the turn guide 80 is formed such that the distance from the supply second roller 15 is gradually shortened from both sides toward the central portion. Alternatively, as shown in (b), the distance from the supply second roller 15 is gradually reduced from one side to the other side. Further, as shown in (a) and (b), in addition to cutting into a desired shape, the side of the tip may be formed by bending as shown in (c).

Next, the operation of the above configuration will be described. Sucker 1
2 picks up the unexposed film from the supply magazine 10. At this time, supply first roller pair 13,1
3'and the supply second roller pair 15, 15 'are separated from each other. Then, the tip of the picked-up film is inserted between the pair of supply first rollers 13, 13 ', the vicinity of the tip contacts the film separating portion 80a of the supply guide 80, and the vicinity of the tip of the film bends. . Therefore, even if there is a plurality of films picked up by static electricity or the like, the vicinity of the leading end of the film is curved, so that the film is judged and double feeding of the film is prevented.

Then, a drive motor (not shown) is driven, the supply first roller pair 13, 13 'and the supply second roller pair 15, 15' come into contact with each other, and the film is nipped and conveyed by the supply first roller 13, and the turn guide is used. 1
4, the supply second roller 15, the first guide plate 45, and the second guide plate 46 are conveyed to the pre-alignment roller 21. When the trailing edge of the film comes out of the supply second roller pair 15, 15 ', the drive motor (not shown) is driven again, and the supply first roller pair 13, 13' and the supply second roller pair 15, 15 'are separated. It will be in the state of doing.

The pre-alignment roller 21 conveys the film in the direction orthogonal to the rotation axis of the roller. Here, the exposure first roller 19 and the exposure first 'roller 19' are stopped, and the leading end of the film 60 contacts the exposure first roller 19 and the exposure first 'roller 19' to perform positioning. (See Figure 9).

Next, the exposure first roller 19 and the exposure first '
The roller 19 ', the exposure second roller 20, and the exposure second' roller 20 'are driven by a drive motor (not shown),
Further, the film 60 is driven in the sub-scanning direction, and the laser beam 17 is driven in the scanning direction to record an image on the film 60.

The rear end of the film 60 is the sensor 72.
Therefore, when detected, the motor 38 is driven, the first cam 39 rotates the first cam follower 41 in the clockwise direction in FIG. 1, and the biasing force of the spring 43 weakens (FIG. 1).
0). Therefore, in the state where the pressing force of the exposure first 'roller 19' pressing the exposure first roller 19 via the film 60 is weakened, these exposure first and first 'rollers 1
9 and 19 'sandwich and convey the film 60.

The trailing edge of the film 60 is the exposure first roller 19
When the writing is performed up to the rear end of the film 60 after the first exposure roller 19 'and the exposure first' roller 19 'are removed, the exposure first roller 19, the exposure first' roller 19 ', the exposure second roller 20, and the exposure second' are formed. The drive of the roller 20 'is stopped and is now driven in the opposite direction. The motor 38 continues to rotate, the second cam 40 causes the second cam follower 42 to rotate clockwise in FIG. 1, the third arm 32 to rotate clockwise, and the film reset guide roller 22 to move to two points. Move to the position of the chain line. Then, the film 60 is transferred to the roller 51,
It is nipped and conveyed by the roller 52 (see FIG. 11).

Then, guided by the discharge guide plate 61, the film 60 is conveyed to the receive 4 via the rollers 55 and 56, and is stored in the receive magazine 23.
According to the above configuration, when the front end portion of the film 60 contacts the first exposure and first exposure 1'rollers 19 and 19 ', the writing has not started yet, so there is no effect on image formation.

At the time when the front end of the film 60 is nipped and conveyed by the exposure first and first 'rollers 19, 19', the rear end of the film 60 has the first and second guide plates 45, 4 '.
Since it is guided to the vertical part of 6, the conveyance resistance is large,
The exposure first 'roller 19' is strongly urged by a spring 43.

When the rear end of the film 60 reaches the horizontal portion, the conveyance resistance decreases, so the first cam 39
By. Even if the biasing force of the spring 60 weakens and the biasing force of the exposure first 'roller 19' on the first exposure roller 19 weakens, the film 60 is conveyed.

Therefore, the film 6 conveyed from substantially above.
The first and second guides 45 for guiding 0 in a substantially horizontal direction,
46, the first exposure provided on the horizontal portion of the guide,
Even if the writing is performed after the exposure first 'rollers 19 and 19', the exposure first roller 19 'of the exposure first' roller 19 'is kept until the trailing end side of the film 60 becomes horizontal.
By increasing the urging force on the film 60, the film 60 can be conveyed, and the laser imager can be downsized.

Further, when the trailing edge of the film 60 reaches the horizontal portion of the guide, the biasing force of the exposing first 'roller 19' to the exposing first roller 19 is weakened so that the trailing edge of the film 60 is exposed to the first exposing portion. 'Roller 19' and exposure first roller 19
It is possible to prevent the occurrence of impacts that occur at the time of leaving the container, and to make it possible to carry the paper evenly.

Further, the front end of the film 60 nipped and conveyed between the first exposure roller and the first exposure roller 19 and 19 'reaches the second exposure roller and the second exposure roller 20 and 20', respectively. When sandwiched between rollers, the spacing between these rollers is set to be thinner than the thickness of the film,
Moreover, since the exposure second 'roller 20' is made lightweight, it is possible to prevent the impact generated by the contact between the front end of the film 60 and the roller.

Furthermore, the first and second guide plates 45, 46
Since the connection part of is comb-shaped to engage with each other,
The step of the connecting portion does not occur, the film 60 is smoothly transported, and uneven feeding of the film is eliminated.

Similarly, the end shape of the turn guide 14 is
As shown in FIGS. 8 (a) and 8 (c), the distance from the supply second roller 15 is gradually shortened from both sides toward the center portion, or as shown in FIG. 8 (b), the supply second roller 15 is provided. The distance between and is gradually shortened from one side to the other side, thereby preventing the elastically deformed film 60 from bouncing when transferring to the second supply roller 15, thereby reducing the size of the apparatus and Smooth transport is possible.

Further, as shown in FIG. 8 (c), by bending the side of the leading end, the film 60 in which the bent portion bounces is supported, so that the apparatus can be further downsized and smooth transportation can be performed. Become.

Further, the supply guide 80 has a comb tooth portion 80a in which concave portions and convex portions are alternately provided at the end thereof, and the turn guide 14 is engaged with the convex portion of the comb tooth portion 80a of the supply guide 80. By forming the hole 14a to be formed, a step is not generated in the connection portion between the supply guide 80 and the turn guide 14, the film 60 is smoothly conveyed, and uneven feeding of the film is eliminated.

[0069]

As described above, in the laser imager of the present invention, when the front end of the sheet comes into contact with the first exposure roller and the first exposure roller, the writing is not yet started, so that the image formation is completed. There is no effect on.

When the front end of the sheet is nipped and conveyed by the exposure first and first 'rollers, the rear end side of the sheet is guided by the vertical portion of the guide, so that the conveyance resistance is large,
The biasing force adjusting means strengthens the biasing force of the biasing means. This state continues until the trailing edge of the sheet reaches the horizontal portion of the guide.

When the trailing edge of the sheet reaches the horizontal portion of the guide, the conveyance resistance decreases, so that the urging force adjusting means applies the first exposure roller to the first exposure roller via the urging portion. Weaken the power.

Therefore, by increasing the biasing force of the first exposure roller to the first exposure roller until the trailing end side of the sheet becomes horizontal, a guide for guiding the sheet conveyed from above substantially in the horizontal direction. Even if the writing is performed after the exposure first and exposure first 'rollers provided on the horizontal portion of the guide, the sheet can be smoothly conveyed, and the laser imager can be downsized. It is possible to plan.

Further, when the trailing edge of the sheet reaches the horizontal portion of the guide, the urging force of the exposing first 'roller on the exposing first roller is weakened so that the trailing edge of the sheet is exposed to the exposing first' roller and exposing first roller. It prevents the occurrence of impact when the roller is separated from the roller.

Further, since the connecting portions of the first and second guide plates of the guide are in the shape of comb teeth which engage with each other, the step of the connecting portion does not occur, the sheet is smoothly conveyed, and the film Eliminates uneven feeding.

Similarly, the end shape of the turn guide is gradually shortened from the both sides toward the center of the supply second roller, or from the one side of the supply second roller. By gradually shortening toward the other side, the rear end of the curved sheet moves to the second position.
It prevents bouncing when transferring to the supply roller, which enables downsizing of the device and smooth transportation.

Further, the end of the supply guide is formed with a comb tooth portion in which concave portions and convex portions are alternately provided, and the turn guide is formed with a hole with which the convex portion of the comb tooth portion of the supply guide is engaged. As a result, a step does not occur at the connection portion between the supply guide and the turn guide, the sheet is smoothly conveyed, and uneven feeding of the film is eliminated.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of a print unit according to an embodiment.

FIG. 2 is an overall configuration diagram of a laser imager of the present embodiment.

FIG. 3 is a diagram illustrating a connecting portion between a first guide plate and a second guide plate in FIG.

FIG. 4 is a perspective view of a third guide in FIG.

5 is a configuration diagram of a film take-out section of the supply module in FIG.

6 is a perspective view of a supply guide and a supply first roller in FIG.

FIG. 7 is a diagram illustrating a connection between a supply guide and a turn guide.

8 is an explanatory diagram of a terminal end portion of the turn guide in FIG.

FIG. 9 is a diagram illustrating the operation of the print unit in FIG.

FIG. 10 is a diagram illustrating the operation of the print unit in FIG.

FIG. 11 is a diagram illustrating an operation of the print unit in FIG.

FIG. 12 is a configuration diagram of a writing unit of a conventional laser imager.

FIG. 13 is a configuration diagram illustrating a problem of a conventional laser imager.

[Explanation of symbols]

 19 exposure first roller 19 'exposure first' roller 20 exposure second roller 20 'exposure second' roller 39 first cam 41 first cam follower 43 spring 45 first guide plate 46 second guide plate 72 sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B65H 5/36

Claims (6)

[Claims] 1. A guide that guides a sheet conveyed from above in a substantially horizontal direction, an exposure first roller that is provided in a substantially horizontal portion of the guide, and is driven to rotate, and an exposure first roller that contacts the first exposure roller. 1'which is provided so that it can contact
An exposure roller; an urging means for urging the exposure first 'roller toward the first exposure roller side; and an urging force adjusting means for adjusting the urging force of the urging means. In the laser imager in which writing is performed after the sheet, the urging force adjusting means applies the urging force of the urging means until the rear end of the conveyed sheet reaches the horizontal portion of the guide. Is larger than the urging force when the sheet is detached from the exposure first and exposure first 'rollers. 2. The biasing force adjusting means includes a cam that rotates in synchronization with driving of the exposure first and second exposure rollers, and a base end portion that is rotatable, and a rotation end portion that slides on the cam. The biasing means has one end locked to the exposure first 'roller side and the other end locked to the cam follower, and the exposure first' roller is connected to the exposure first roller. The laser imager according to claim 1, wherein the spring is a spring for pressing the cam follower against the cam and pressing the cam follower against the cam. 3. The guide includes a first guide plate extending in a substantially vertical direction, and a second guide plate connected to the first guide plate and curved in the exposure first roller direction. The laser imager according to claim 1 or 2, wherein the connecting portions of the first and second guide plates have a comb-like shape that engages with each other. 4. The laser imager comprises a supply magazine in which unexposed sheets are stored, a supply first roller pair which is provided above the supply magazine and which nips and conveys the sheet, and the sheet from the supply magazine. Pickup means for picking up and passing the front end portion of the sheet to the first supply roller pair, a supply guide for guiding the sheet picked up by the pickup means to the supply first roller, and nip conveyance by the first supply roller pair A turn guide for guiding the sheet to the guide plate, and a supply second roller pair provided at an end portion of the turn guide for nipping and transporting the sheet, wherein the end shape of the turn guide is the supply The distance from the second roller gradually decreases from both sides toward the center. The laser imager according to any one of claims 1 to 3, wherein Rukoto. 5. The laser imager includes a supply magazine that stores unexposed sheets, a first supply roller pair that is provided above the supply magazine, and that nips and conveys the sheet, and the sheet from the supply magazine. Pickup means for picking up and passing the front end portion of the sheet to the first supply roller pair, a supply guide for guiding the sheet picked up by the pickup means to the supply first roller, and nip conveyance by the first supply roller pair A turn guide for guiding the sheet to be guided to the guide plate, and a supply second roller pair provided at an end portion of the turn guide for nipping and conveying the sheet. The distance from the second roller gradually increases from one side to the other. Claims 1 to 3, characterized in that to shorten
The laser imager according to any one. 6. The end of the supply guide is formed with a comb tooth portion in which concave portions and convex portions are alternately provided, and the turn guide is engaged with a convex portion of the comb tooth portion of the supply guide. 6. The laser imager according to claim 1, wherein a hole is formed.