JPH0511355A - Carrying mechanism in printer part for photosensitive material - Google Patents

Abstract

PURPOSE:To obtain a carrying mechanism in a printer part for a photosensitive material capable of holding the smoothness of the photosensitive material in the exposure part of a photographic printer by means of simple mechanism. CONSTITUTION:Subdriving rollers 20 are arranged in the bending part of a carrying path along which the photographic sheet 12 is carried from a supply reel 14 to the main driving roller 22. Thus, the traveling load of the photographic sheet 12 is reduced and the sheet can be carried in a stable condition. When the photographic sheet 12 is held between the main driving rollers 22, a controller 50 rotates the subdriving rollers 20 in an opposite direction to a carrying direction, so that tension is generated in the photographic sheet 12 positioned between the main driven roller 22 and the subdriving roller 20. Therefore, the slack of the photographic sheet 12 is removed, the smoothness of the photographic sheet 12 in the exposure part can be held and a sharp image can be printed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyance mechanism in a printer section of a photosensitive material which is wound around a supply reel and has a long shape.

[0002]

2. Description of the Related Art In a photographic printing apparatus, a printing paper on which an image on a negative film is printed in a printer section is a developing tank,
It is developed in a fixing tank and a rinsing tank in sequence, then dried in a drying section, and finally cut into individual images for commercialization as photographic prints.

In such a processing step, in order to maintain the quality of photographic prints, it is necessary not to carry out out-of-focus printing, and in order to prevent this so-called out-of-focus, printing paper is exposed in the exposure section of the printer section. It is an essential condition to remove the slack and hold it on a flat surface for baking.

Therefore, conventionally, a tension roller is arranged on the upstream side of the exposure section of the printer section, and the photographic paper is held flat on the exposure section.

However, with the above-mentioned mechanism, when automating the photographic printing work, the mechanism becomes complicated, and a large space for installing this is required.

[0006]

SUMMARY OF THE INVENTION In consideration of the facts described above, the present invention provides a transporting mechanism for a printer portion of a photosensitive material which can maintain the flatness of the photosensitive material with a simple mechanism in the printer portion of a photographic printing apparatus. With the goal.

[0007]

According to the present invention, there is provided a mechanism for transporting a photosensitive material in a printer section, which sandwiches and transports a long photosensitive material which is arranged upstream of the printer section of a photographic printing apparatus and pulled out from a supply reel. A sub-driving roller, a driving means for rotating the sub-driving roller in a direction in which the photosensitive material is conveyed to the downstream side of the printer unit or pulled back to the upstream side, and arranged larger than the sub-driving roller on the downstream side of the printer unit. A main drive roller that has a conveying force and holds the photosensitive material and conveys it to the processor section,
Control means for rotating the sub-driving roller in the direction of pulling back the photosensitive material upstream by the driving means when the main driving roller is stopped, and for stopping the driving means when driving the main driving roller. It is characterized by

[0008]

In the mechanism for transporting the photosensitive material having the above-described structure, the auxiliary driving roller is arranged at the bent portion of the transporting path of the photosensitive material from the supply reel to the main driving roller. The load is reduced and the product is transported in a stable state.

Next, when the photosensitive material is nipped by the main drive roller arranged on the downstream side of the printer section, the drive means controlled by the control means rotates the auxiliary drive roller in the direction opposite to the conveying direction of the photosensitive material. Let As a result, a constant tensile force is generated on the photosensitive material located between the main driving roller and the sub driving roller, and the slack of the photosensitive material is removed. Therefore, since the flatness of the photosensitive material is maintained when the photosensitive material is printed on the exposed portion of the printer unit, so-called defocusing can be prevented.

Further, when the main driving roller is nip-conveying the photosensitive material, by stopping the driving means for rotating the sub driving roller, the sub driving roller can freely rotate without being restricted by the driving means. It does not hinder material transportation. Further, since the carrying force of the sub-driving roller is set to be weaker than the carrying force of the main-driving roller, the carrying operation of the main-driving roller is not hindered without stopping the sub-driving roller.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a supply reel 14 loaded with a photographic printing paper 12 as a roll-shaped photosensitive material is arranged in a printer section 10 having a carrying mechanism according to this embodiment. .. The supply reel 14 is housed in a magazine 16 so that it can be easily mounted.

A transport roller 18 is arranged on the downstream side of the supply reel 14, and the photographic printing paper 12 pulled out from the supply reel 14 is arranged on the downstream side of the auxiliary drive roller 20.
It is designed to be transported to. The photographic paper detection sensor 1 is provided between the transport roller 18 and the sub-driving roller 20.
9 is provided. As a result, the auxiliary drive roller 20
Is stopped and the conveying roller 18 is driven until the photographic paper detection sensor 19 detects the photographic paper 12, thereby forming a predetermined loop.

A gear 21 is attached to the drive shaft of the drive roller 20.
Is fixed. A belt 27 is wound around the gear 25 fixed to the shaft of the gear 21 and the motor 23,
The driving force of the motor 23 is transmitted to the drive shaft. The auxiliary drive roller 20 is set to have a smaller carrying force than the main drive roller 22 as a pacemaker, which will be described later, arranged on the downstream side. This is because if the conveying force of the sub-driving roller 20 is too large, it will affect the conveying ability of the main driving roller 22 and
This is because the feeding length of the photographic printing paper 12 varies due to, and the size of the photographic print is not constant. Therefore,
In this embodiment, the torque of the sub drive roller 20 is limited to 10% to 50% of the torque of the main drive roller 22.

The motor 23 is connected to the controller 50,
It is designed to rotate forward or reverse. As a result, the sub-driving roller 20 is rotated in the direction opposite to the conveying direction of the printing paper 12, and a certain tensile force is applied to the printing paper 12 sandwiched between the main-driving roller 22 and the sub-driving roller 20 to cause slack. Is removed to maintain the flatness of the printing paper 12.

Immediately below the auxiliary drive roller 20, on the downstream side,
A transmission sensor 24 is arranged to detect passage of the front and rear ends of the photographic printing paper 12. When the leading edge of the photographic paper 12 is detected, the shutter 26 is opened and the photographic paper 12 is conveyed to the exposure section 28.

An exposure lamp 30, a lens 34, a mirror 36 and a printing mask 38 are arranged in the exposure section 28 so that an image of the negative film 40 is printed on the photographic printing paper 12.

Further, the main drive roller 22 described above is arranged on the downstream side of the exposure section 28, and is driven by a motor 29. The motor 29 is connected to the control device 50 and stops the main drive roller 22 or rotates the main drive roller 22 in the transport direction of the photographic printing paper 12. As a result, the main drive roller 22 feeds the photographic paper 12 by a certain amount for each image, and also conveys the photographic paper 12 to the carry-out roller 42 arranged on the downstream side. Further, the printing paper 12 is provided on the downstream side of the main drive roller 22.
A transmissive sensor 31 for detecting the tip of the is disposed.

The photographic printing paper 12 conveyed from the main drive roller 22 is conveyed to a processor section (not shown) by a unloading roller 42 arranged on the downstream side of the main drive roller 22 to form a predetermined loop. The paper 12 is sequentially developed.

Next, the operation of the transfer mechanism according to the present invention will be described with reference to FIG.
It will be described according to the flowchart shown in FIG.

In step 100, the magazine 16 is set. Next, at step 102, the transport roller 18 and the auxiliary drive roller 20 are rotated (normally rotated) in the transport direction of the printing paper 12. As a result, the leading end of the roll-shaped printing paper 12 wound on the supply reel 14 is nipped by the carrying roller 18 and carried to the downstream side. The leading end of the photographic printing paper 12 is carried to the sub-driving roller 20 arranged at the bent portion of the carrying path of the photographic printing paper 12, and is nipped and carried to the exposure section 28 by the sub-driving roller 20. As described above, by disposing the sub-driving roller 20 at the bent portion of the conveying path from the supply reel 14 to the main driving roller 22, the traveling load of the photographic paper 12 is reduced and the photographic paper 12 is conveyed in a stable state. It becomes possible.

Next, in step 104, the transmission sensor 24
Determines whether the front end of the printing paper 12 has been detected. When the leading edge of the printing paper 12 is detected, the sub-driving roller 20 and the transport roller 18 are stopped and the shutter 26 is opened in step 106. When the shutter 26 opens,
In step 108, the auxiliary drive roller 20 and the transport roller 18 are rotated in the transport direction (normal rotation), and the main drive roller 22 is rotated in the transport direction (normal rotation). Next, at step 110, it is determined whether or not the transmission sensor 31 has detected the leading end of the photographic printing paper 12. When the leading edge of the printing paper 12 is detected, the main drive roller 22 and the sub drive roller 20 are stopped in step 112. At this time, the transport roller 18 is driven until the transmission sensor 19 detects the printing paper 12 to form a loop.

Next, at step 114, the main drive roller 2
While keeping the number 2 stopped, the sub-driving roller 20 is rotated (reversely rotated) in the direction opposite to the conveying direction to apply a tensile force to the printing paper 18 located in the exposure section 28 to remove the slack. In step 116, the photographic paper 1 with the slack removed to form a flat surface
2 is exposed.

When the exposure is completed, the motor 23 is stopped in step 118, the main drive roller 22 is rotated, and a fixed amount of the photographic paper 12 is fed. At this time, since the sub-driving roller 20 is rotatable without being restricted by the motor 23, the photographic printing paper 12 is conveyed without being damaged. Here, the transport roller 18 is driven until the transmission sensor 19 detects the photographic paper 12, and forms a loop again.

Although the motor 23 is stopped in this embodiment, the torque of the auxiliary drive roller 20 is 10 times that of the main drive roller 22 even if the drive is continued.
% To 50%, so the main drive roller 22
Does not affect the transport function of.

Next, at step 120, it is judged whether or not the trailing edge of the printing paper 12 is detected. If not detected, the process returns to step 114 to expose the printing paper 12 to light. Also, photographic paper 1
When the trailing edge of 2 is detected, the main drive roller 22 conveys the photographic paper 12 by a predetermined amount in step 122, and the flowchart ends.

In this embodiment, the sub drive roller 20 is used.
The flatness of the photographic printing paper 12 is maintained only by the main drive roller 22 and the main driving roller 22, but if a suction chamber is arranged between the two and the back surface of the photographic printing paper 12 is sucked, the photographic printing paper 12 can be further held. Maintains good flatness.

When the photographic printing paper 12 is relatively thin and the torque of the sub-driving roller 20 may be small, for example, when the torque of the main-driving roller 22 is ⅕ or less, the main-driving roller 22 is temporarily cut. Even after the nip 12 is sandwiched, even if the sub-driving roller 20 is always reversed, the conveyance function of the main-driving roller 22 is not hindered and the flatness of the printing paper 12 can be maintained. As a result, it is not necessary to rotate the auxiliary drive roller 20 in the forward direction and the reverse direction, and the printing capacity is improved.

[0028]

As described above, the conveying mechanism of the photosensitive material in the printer section according to the present invention can easily maintain the flatness of the photosensitive material by disposing the auxiliary driving roller.

[Brief description of drawings]

FIG. 1 is a schematic view showing a photographic printing apparatus to which a conveyance mechanism of a photosensitive material printer unit according to the present invention is applied.

FIG. 2 is a flowchart showing the operation of a transport mechanism in the printer section of the photosensitive material according to the present invention.

[Explanation of symbols]

 20 Sub-driving roller 22 Main-driving roller 50 Control means (control device)

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[Procedure amendment]

[Submission date] August 28, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

A transport roller 18 is arranged on the downstream side of the supply reel 14, and the photographic printing paper 12 pulled out from the supply reel 14 is arranged on the downstream side of the auxiliary drive roller 20.
It is designed to be transported to. The photographic paper detection sensor 1 is provided between the transport roller 18 and the sub-driving roller 20.
9 is provided. In Tsu by to this, the auxiliary drive roller 2
A predetermined loop is formed by stopping 0 and driving the transport roller 18 until the photographic paper detection sensor 19 detects the photographic paper 12.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

The drive shaft of the auxiliary drive roller 20 has a gear 2
1 is fixed. A belt 27 is wound around the gear 21 and the gear 25 fixed to the shaft of the motor 23, and the driving force of the motor 23 is transmitted to the drive shaft. The sub-driving roller 20 is set to have a smaller carrying force than the main-driving roller 22 as a pacemaker, which will be described later, arranged on the downstream side. This is because if the conveying force of the sub-driving roller 20 is too large, it affects the conveying ability of the main driving roller 22, and the feeding length of the printing paper 12 by the main driving roller 22 varies.
This is because the size of the photographic print is not constant. Therefore, in this embodiment, the torque of the auxiliary drive roller 20 is limited to 10% to 50% of the torque of the main drive roller 22.

Claims (1)

Claim: What is claimed is: 1. A sub-driving roller which is arranged upstream of a printer section of a photographic printing apparatus and which nips and conveys a long photosensitive material drawn from a supply reel, and the sub-driving roller. A driving means for rotating the photosensitive material in a direction to convey it to the downstream side of the printer section or to pull it back to the upstream side, and a processor which is arranged on the downstream side of the printer section and has a conveying force larger than that of the sub-driving roller and nip the photosensitive material. A main drive roller that conveys the photosensitive material to a sheet, and when the main drive roller is stopped, the sub drive roller is rotated by the drive means in a direction in which the photosensitive material is returned to the upstream side, and when the main drive roller is driven, the drive means is stopped. And a control means capable of controlling the photosensitive material.