JP3074100B2 - Photosensitive material transport device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive material transporting device for transporting a photosensitive material such as photographic paper to an image printing position.

[0002]

2. Description of the Related Art In a printing apparatus for obtaining a photographic print by printing an image from a negative film onto a photographic paper, a long photographic paper is wound in a roll and stored in advance, and the photographic paper is pulled out from the roll to obtain an image. It is transported to the printing position.

In this type of printing apparatus, an image is printed on photographic paper and then cut into individual products to obtain a product size, and the photographic paper is cut in advance to the size of a printed image before being transported to an image printing position. There is a type.

When the rolled photographic paper is cut before printing, the amount of rewinding when replacing the magazine with a magazine containing another type of photographic paper during the printing operation is small, so that efficient printing is performed. Work becomes possible.

However, when the rolled photographic paper is conveyed to the printing position after being cut, a means for securely maintaining the photographic paper in a flat state near the printing position is required. To ensure the conveyance of the photographic paper after the cutting and the maintenance of the flat state, an endless belt is used, and the photographic paper after the cutting is formed by forming a number of small holes in the endless belt and communicating with a negative pressure source. Can be transported to the printing position without fail by suction even though it is short, and the flat state of the photographic paper can be maintained at the printing position.

However, in the case where the photographic paper is sucked through a number of small holes provided in the endless belt, unless a uniform suction pressure is applied to each part of the photographic paper, the photographic paper is turned up or the flatness is maintained. Becomes impossible.

Further, when the printed photographic paper is transported to a downstream process such as a developing device, a guide for changing the transport direction of the photographic paper is required, so that the number of parts increases and the installation space increases. Becomes big.

[0008]

SUMMARY OF THE INVENTION In view of the above-mentioned facts, the present invention provides a photosensitive material transport apparatus capable of uniformly attracting a photosensitive material when the photosensitive material is attracted by an endless belt. Is the purpose.

Further, the present invention provides a photosensitive material transport apparatus which can easily and smoothly change the transport direction of a photosensitive material without providing a complicated guide when the photosensitive material after image printing is transported. That is the purpose.

[0010]

The invention according to claim 1 is
A photosensitive material conveying device for conveying the photosensitive material to the image printing position, a plurality of through-circulation endless belt the small hole is formed, is disposed within the loop of the circulating endless belt, a circulating endless belt at the image printing position A support base which is supported in a planar shape and has suction holes communicating with the through holes of the endless belt, and is connected to the support base and is endlessly circulated from both ends in the belt width direction.
A suction duct for guiding the air inside the support to the outside of the belt loop , and a negative pressure provided in the suction duct provided in the suction duct;
And negative pressure means.

According to a second aspect of the present invention, there is provided a photosensitive material transporting apparatus for transporting a photosensitive material to an image printing position, comprising an endless belt for sucking and holding the photosensitive material and transporting the photosensitive material to the printing position. And a belt holding means for changing the photosensitive material transport direction by giving a temporarily elevated movement locus to the endless belt downstream of the printing position of the endless belt.

[0012]

[Function] Circulating endless belt (hereinafter simply referred to as "belt")
U. ) Is supported on the support base by the belt formed on the belt.
A suction hole communicating with the small hole is formed. Also support
A suction duct is connected to the table, and a negative pressure is applied to this suction duct.
Means are provided. Here, suction suction is performed by negative pressure means.
When the inside of the container is negative pressure, the air in the support
From the opposite ends of the belt loop. At this time,
The photosensitive material receives suction through the small holes in the belt and
The belt is transported while being held by suction. Also, the air belt
Flow from both ends in the width direction to the outside of the belt loop.
Because sufficient air flows through the suction holes near both ends in the
It is possible to eliminate the variation in suction force depending on the location in the width direction.
it can. For this reason, the photosensitive material covers the belt width direction.
Since a substantially uniform suction force is applied, the photosensitive material
There is no turning up.

After the image is printed at the printing position, the photosensitive material moves downstream with the endless belt while being attracted and held by the endless belt. Belt holding means is provided downstream of the printing position of the endless belt, and a part of the endless belt temporarily rises as it moves, so that the photosensitive material is lifted up along the protrusion and the transport direction is changed. Is done. Therefore, the conveying direction of the photosensitive material can be changed without providing a special plate-shaped guide or the like.

[0014]

【Example】

(Overall Configuration of Photographic Printing Apparatus) FIG. 1 shows a photographic printing apparatus 10 to which the present invention is applied. In this photo printing apparatus 10, a magazine 1 in which photographic paper P is wound in a roll shape
2 is loaded. After the magazine 12 is inserted into the photoprinting apparatus 10, the opening / closing door 14 is closed, and the loading is completed.

The magazine 12 has a driving roller 16 around which the leading end of the photographic paper P is wound. The driving roller 16 receives a driving force of a driving belt 18 provided in the photographic printing apparatus 10. , And the leading end of the photographic paper P is drawn into the photographic printing apparatus 10.

The extracted printing paper P is cut to a desired length by the cutter 22 and then conveyed to the image printing position 24.
The image on the negative film N is printed by the printing light from the light source 26 via the optical means 28 and the shutter 32. The photographic paper P after printing is sent to the developing device 36 via the transport path 34, and the printed image is developed.

(Structure near Image Printing Position) As shown in FIGS. 2 to 4, an endless belt 42 is provided at the image printing position downstream of the cutter 22 along a substantially triangular movement locus. The endless belt 42 has a large number of small through holes 44 formed over the entire area thereof. Further, a part of the endless belt 42 is placed on a support base 46 so as to be arranged horizontally at the printing position. This support base 46
As shown in FIG. 3, a large number of long holes 48 are formed to form a negative pressure communicating portion.
It has a function of adsorbing the upper photographic paper P to the endless belt 42.

A winding roller 52 for winding the upstream end of the endless belt 42 on the upstream side (in the direction of arrow U) of the support base 46.
Are horizontally supported by the machine frame 62 (FIG. 3).
An elevating roller 54 is horizontally disposed so that the endless belt 42 is held between the winding roller 52 and the endless belt 42. The lifting roller 54 is axially supported at both ends in the axial direction by a turning arm 56. The revolving arm 56 is supported by a frame 62 via a shaft 58. The swing arm 56
Is connected to a self-holding solenoid 66 via a link 64. Accordingly, when a pulse voltage is applied to the solenoid 66 and the solenoid 66 is actuated, the swing arm 56 swings up and down around the shaft 58, and the lift roller 54 is separated from the endless belt 42. When a pulse voltage of the reverse operation is input to the solenoid 66, the turning arm 56 and the lifting roller 54 come into contact with the endless belt 42 by their own weight or by the urging force of an elastic body (not shown) to be in contact with the endless belt 42. The printing paper P can be pinched.

A part of the endless belt 42 extends further downstream than the support base 46 on the downstream side of the support base 46 and is wound around the guide roller 68. The guide roller 68 is located at a position equivalent to or slightly higher than the lift roller 54, and is adjacent to a guide roller 69 disposed immediately upstream of the guide roller 68, and the guide roller 69 presses against the outer periphery of the endless belt 42. Have been. That is, the guide roller 69 wraps the outer circumference of the endless belt 42 over about a quarter of its circumference, and then the endless belt 42 wraps around the guide roller 68 over about ／ of the outer circumference of the guide roller 68. The endless belt 42 in this portion is substantially S-shaped. The guide roller 68 is driven and rotated by receiving a driving force of a motor 72 via a timing belt 74, and drives the endless belt 42 to rotate clockwise in FIG.

Therefore, the guide roller 68 and the guide roller 69 form the inverted U-shaped raised portion 42A at one time of the circulation of the endless belt 42 downstream of the printing position. Therefore, the printing paper P on which the image printing has been completed
Is sandwiched between the raised portion 42A and the guide roller 69, the transport direction is changed from a horizontal direction (arrow A direction) to a vertical direction (arrow B direction), and the paper is sent out in the vertical direction. .

The endless belt 42 is wound around the tension roller 76 below the guide roller 68 and the winding roller 52 to form a substantially triangular movement locus. As shown in FIG. 1, the endless belt 42 moving on the support base 46 is provided with an easel device 78 at an upper portion thereof to print a bordered image having a white frame on the photographic printing paper P. It covers the periphery of the paper P.

(Description of Suction Device) As shown in FIG. 4, the support base 46 has a hollow inside, and communication ducts 82 and 83 corresponding to both ends in the width direction of the endless belt 42 are connected. These communication ducts 82, 83 bypass the folded portion of the endless belt 42 disposed below the support base 46, reach below the endless belt 42, and are connected to the communication duct 84. The communication duct 84 is further extended downward and connected to a fan box 86 provided with a suction fan 85.

As a result, the air in the support base 46 escapes from both ends in the width direction (left and right directions in FIG. 4) of the loop of the endless belt 42 via the communication ducts 82 and 83, and is sucked by the suction fan 85. Since the air is blown in the directions of arrows C and D, the inside of the support base 46 becomes a negative pressure, and this negative pressure is transmitted through the long hole 48 of the support base 46 and the small hole 44 of the endless belt 42 to the printing paper P on the endless belt 42. And the photographic paper P is attracted to the endless belt 42. In particular, the communication ducts 82 and 83
The endless belt 42 communicates with the support base 46 in both width directions of the endless belt 42, so that the endless belt 42 is provided with a substantially uniform suction force over the entire area in the width direction, and the printing paper P is reliably sucked.

A shutter 32 is arranged between the printing paper P at the printing position and the optical means 28.

(Operation of the Embodiment) The magazine 12 containing the printing paper P is inserted into the photoprinting apparatus 10 and the door 14 is opened.
Is closed, the magazine 12 is loaded, and the driving roller 16 is pressed against the driving belt 18 to be in a driving force transmitting state.

The driving roller 1 is driven by a driving force of a motor (not shown).
When the printing paper P is rotated, the leading end of the printing paper P is
And is conveyed to the cutter 22. Here, the cutter 22 cuts off the leading end of the printing paper P and cuts off the irregular portion. Further, the photographic paper P is sent to the downstream side and
And between the lift roller 54. In this state, the solenoid 66 is excited to raise the elevating roller 54 in advance. When the photographic paper P is inserted into the cutter 22 by a length corresponding to the size of the printed image, the cutter 22 is operated again to cut the photographic paper P. In order to convey the cut photographic paper P, the elevating roller 54 descends and nips and conveys the photographic paper P between the winding roller 52 and the endless belt 42.

At the same time, the leading end of the photographic paper P sent is placed on the endless belt 42, so that the negative pressure in the support base 46 is transmitted through the small holes 44, and the photographic paper P is 44
Is adsorbed. The endless belt 42 transports the printing paper P to the printing position by the driving force of the motor 72 and stops. In this state, the upstream end of the printing paper P is already
Is out of range.

In this state, the shutter 32 is operated and the original image of the negative film N is transferred to the photographic paper P via the optical means 28.
Burned to.

When printing is completed, the endless belt 42 rotates again, and conveys the printing paper P to the downstream side. Thus, the suction of the photographic paper P to the endless belt 42 is reliably performed over the entire area of the photographic paper P. That is, since negative pressure is supplied to the support base 46 from both sides in the width direction of the endless belt 42 through the communication ducts 82 and 83, a change in the negative pressure in the width direction of the belt 42 is small, and a substantially uniform negative pressure is applied to the printing paper. It can be applied to the entire area of P.

When the printing paper P is further horizontally conveyed and reaches the guide roller 69, it is detached from the support base 46, so that the negative pressure suction is released. At the same time, the photographic paper P has a raised portion 42A.
, And is transported vertically upward (in the direction of arrow B), and the transport direction is changed. After that, the developing device 3
Sent to 6.

On the downstream side of the printing position, a raised portion 42 is provided.
If A is not provided, it is necessary to provide an upwardly curved guide means at a position rightward of the endless belt 42 shown in FIG. The horizontal transport path of P is formed longer to the right side than in the state of FIG. 2 and requires a large installation space.

[0032]

As described above, the present invention has an excellent effect that the photosensitive material can be reliably attracted to the printing position and the structure for changing the conveying direction of the photosensitive material can be easily made.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a photographic printing apparatus to which the present invention is applied.

FIG. 2 is an enlarged vertical sectional view showing the vicinity of an image printing position in FIG.

FIG. 3 is an exploded perspective view showing a part of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

[Explanation of symbols]

 P Photographic paper 10 Photoprinting device 32 Shutter 42 Endless belt 42A Raised portion 44 Small hole 46 Support base 48 Long hole 68 Guide roller (belt holding means) 69 Guide roller (belt holding means) 82 Communication duct (suction duct) 83 Communication duct (Suction duct) 86 Fan box (negative pressure means)

Continuation of the front page (56) References JP-A-2-95637 (JP, A) JP-A-6-347913 (JP, A) JP-A-5-17645 (JP, U) (58) Fields surveyed (Int) .Cl. ⁷ , DB name) G03B 27/58 G03B 27/32 G03B 27/46

Claims (2)

(57) [Claims] 1. A photosensitive material transport device for transporting a photosensitive material to an image printing position, comprising: a circulating endless belt having a plurality of small through holes formed therein; wherein while supporting the circulation endless belt plane at a position 循
A support having a suction hole communicating with the small through-hole of the ring endless belt , connected to the support, and circulating from both ends in the belt width direction.
A photosensitive material conveying device, comprising: a suction duct for guiding the air in the support table to the outside of the loop of the endless belt; and negative pressure means provided in the suction duct to make the inside of the suction duct a negative pressure. . 2. An endless belt for transporting a photosensitive material to an image printing position, wherein the photosensitive material is attracted and held and transported to the printing position, and a downstream side of the printing position of the endless belt. And a belt holding means for changing the photosensitive material transport direction by giving a temporarily raised movement trajectory to the endless belt.