JP2515363B2 - Photo printing equipment - Google Patents

Description

The present invention relates to a photographic printing apparatus for sequentially printing images from a negative film onto a long photosensitive material.

[Conventional technology]

In many photographic printing apparatuses, roll-shaped photographic printing paper is sent from the leading end to the printing section, and is further sent and cut into each image by a cutter to reach the developing section.

Since the printing section and the cutting section by the cutter are separated from each other, when the images are continuously printed, the cut photographic paper can be sequentially sent to the developing section, but when the continuous printing is not performed, Is unable to cut the leading edge of the photographic paper having the image immediately after printing until the next printing operation is started, or it is necessary to feed the photographic paper idly to cut the photographic paper, resulting in waste of the photographic paper.

Also, an apparatus has been proposed in which waste of paper is reduced by returning the leading edge of the photographic paper (Sho 62-13073).
No.), it can only be returned to the extent that it can be re-fed without being disengaged from the transport roller provided on the downstream side of the printing unit.
This also has a lot of waste. It is possible to make a large return by providing a transport roller not only on the downstream side of the printing unit but also on the upstream side to enable forward and reverse rotation, but it is difficult to drive both rollers accurately at the same speed, and the manufacturing error of both rollers Due to the slight difference in the outer diameter, the slack of the printing paper occurs between the rollers, that is, in the printing portion, and the printing image is distorted.

In consideration of the above facts, the present invention causes slack in the photosensitive material between these rollers even when transport rollers are provided on the upstream side and the downstream side of the printing unit to enable the feeding and returning of the photosensitive material. The purpose is to obtain a photographic printing apparatus that does not exist.

[Means for Solving Problems] The invention according to claim 1 of the present application is a photographic printing apparatus for printing an image on a long photosensitive material in a printing section, which is provided on the upstream side of the printing section. An upstream side transport roller that can be rotated in the forward and reverse directions,
The downstream side, which is provided on the downstream side of the printing unit, sends the photosensitive material to the downstream side at a linear velocity slightly higher than that of the upstream roller to apply tension to the photosensitive material, and freely rotates when the photosensitive material moves to the upstream side. It is characterized by having a roller and a cutter arranged downstream of the downstream roller for cutting the photosensitive material between printed images.

In the invention according to claim 2 of the present application, in the apparatus according to claim 1, the downstream side roller is formed to have an outer diameter larger than that of the upstream side roller. The feed line speed is higher than that of the upstream roller.

In the invention according to claim 3 of the present application, in the device according to claim 1 or 2, the rotational force of the upstream roller is transmitted to the downstream roller via a one-way clutch, whereby the downstream roller is It is characterized in that when the photosensitive material is moved to the downstream side, it is rotated together with the upstream roller, and when the photosensitive material is moved to the upstream side, it is freely rotated.

[Action]

According to the present invention, when the photosensitive material is fed, the feeding speed of the downstream side conveying roller is slightly higher than that of the upstream side conveying roller, so that a tension is constantly applied between both rollers to cause slack in the photosensitive material in the printing portion. Does not occur.

Further, when the photosensitive material is returned, the downstream side conveying roller freely rotates, so that the upstream side conveying roller applies a tensile force to the photosensitive material, and the slack does not occur in the photosensitive material.

Example of Invention

FIG. 1 shows an overall view of a photographic printing paper conveying system of a photographic printing apparatus to which the present invention is applied. The photographic printing paper 12 accommodated in the photographic printing paper accommodating section 10 is sent to the photographic printing section 14 and the image is transferred. After being exposed, it is sent to the developing unit 18 via the transport processing unit 16.

In this photographic paper container 10, the unexposed photographic paper 12 is accommodated in the box 20 while being rolled, and is set on the machine base 22. When the delivery knob 21 attached to the box 20 is engaged and rotated, the leading end of the photographic paper 12 passes through the drawer 24.

The machine base 22 is provided with a loading sensor 26 for detecting the protruding end of the printing paper 12 and light-shielding nipping rollers 28, 30.

Downstream of the nip rollers 28 and 30, the upstream nip transport roller 3
6, 37, 38 are provided so that the leading end of the photographic printing paper 12 sent through the holding rollers 28, 30 is held and sent to the photographic printing section 14. The upstream side nipping and conveying roller 36 is configured to rotate by receiving the driving force of the motor 40. The motor 40 is driven and controlled mainly by the control circuit 108 using a microcomputer, and starts to rotate by the operation of the loading sensor 26.

One end of the upstream side nipping / conveying rollers 37 and 38 has a shaft 39A, and the machine base 22
An arm 39 pivotally supported to the other end is swingably supported via a bracket 39B, and a tension coil spring 41 is stretched between the arm 39 and the machine base 22. Therefore, the upstream side nipping / conveying rollers 37 and 38 have a biasing force that is pressed against the upstream side nipping / conveying roller 36.

Nip transport rollers 28, 30 and upstream nip transport rollers 36, 37
A guide plate 42 that is rotatable around the nip and conveyance roller 28 by a predetermined angle is provided between and. This guide plate
42 is driven by a driving force of a motor 44 so that it can be rotated from a state along the conveyance path of the photographic paper 12 as shown in FIG. 1 to a state retracted from the conveyance path as shown by an imaginary line. The guide plate 42 is provided with a sensor 46, and the guide plate 42 is the first
When the imaginary line state is reached, it is possible to detect a state in which the intermediate portion of the printing paper 12 has a loop as shown by the imaginary line.

A sensor 48 is provided at the entrance of the photographic printing section 14 so as to face the conveyance path of the photographic paper 12 so that the front end of the photographic paper 12 can be detected.

In the photo printing unit 14, the mask heads 52 and 54 are centered on the optical axis L.
Can be moved toward and away from the optical axis L by an equal distance. These mask heads 52, 54 are fixed to the tip ends of flexible masks 60, 62 whose bases are wound around the winding shafts 56, 58 by the urging force, and cover portions other than the printing range portion of the photographic printing paper 12. The image of the negative film can be printed on the photographic printing paper 12 by the printing light from a light source (not shown) arranged above. These mask heads 52,
The movement of 54 is controlled by the control circuit 108.

A downstream side nipping / conveying roller 64 is axially supported in parallel with the upstream side nipping / conveying roller 36 on the downstream side of the photo printing unit 14.
As shown in FIG. 2, the downstream side nipping / conveying roller 64 is adapted to transmit the rotational force of the upstream side nipping / conveying roller 36 via a one-way clutch 66. This one-way clutch 66 has a small-diameter shaft 64A integrally fixed to a downstream side nipping / conveying roller 64 and a notch 70 formed in an inner peripheral portion of a pulley 68.
It is coaxially supported inside. The balls 72 housed in the notches 70 correspond to the slopes 70A formed in the notches 70.

The pulley 68 is configured to transmit the rotational force of the upstream side nipping / conveying roller 36 via the timing belt 74, and when the photographic paper 12 is rotated in the feeding direction (counterclockwise direction in FIG. 2), the pulley 68 is rotated. Since the ball 72 is sandwiched in the narrow portion between the slope 70A of the 68 and the small diameter shaft 64A, the downstream sandwiching and conveying roller 64 is driven at the same rotation as the upstream sandwiching and conveying roller 36.
Since the balls 72 are accommodated in a wide area between the inclined surface 70A and the small diameter shaft 64A during clockwise rotation in the drawing, the small diameter shaft 64A is not rotated despite the rotation of the pulley 68, and is in a free rotation state. Is taken into consideration.

Further, the downstream side nipping / conveying roller 64 is formed such that the outer diameter thereof is slightly larger than the upstream side nipping / conveying roller 36.
As an example, the outer diameter of the upstream side nipping / conveying roller 36 is 42 mm, and the outer diameter of the downstream side nipping / conveying roller 64 is 42.2 mm. The dimensional difference of the outer diameter is preferably about 0.2 to 0.3 mm. Therefore, the downstream side nipping / conveying roller 64 has a linear velocity higher than that of the upstream side nipping / conveying roller 36 when rotating in the feeding direction, and the upstream side nipping / conveying roller 36 is
And the downstream side nip-conveying roller 64, that is, the photo printing unit.
The feeding force is transmitted while applying tension to the photographic printing paper 12 on 14.

The nipping force between the upstream side nipping / conveying roller 36 and 37, 38 is preferably larger than the nipping force between the downstream side nipping / conveying roller 64 and the pressing roller 76 that abuts against this. As an example, the holding force between the downstream side nip conveying roller 64 and the pressing roller 76 is 1 k.
g, The clamping force between the upstream side nipping and conveying rollers 36, 37 and 38 is 6 kg. As a result, the delivery amount of the photographic printing paper 12 delivered to the photo printing unit 14 is determined by the number of rotations of the upstream side nipping / conveying roller 36, and the downstream side nipping / conveying roller 64 portion provides a feeding amount slightly faster than this feeding amount. There is a slight slip with the photographic paper 12 at the downstream side nipping / conveying roller 64 portion, but since this slip is minute, it does not affect the photographic paper 12.

A cutter 78 is provided on the downstream side of the downstream side nipping and conveying roller 64 so that the photographic paper 12 can be cut by the driving force of the motor 80. The photographic paper 12 after cutting is temporarily stored in the stock section 82, then raised and sent to the developing section 18.

A sensor 86 for detecting printing paper is provided on the upstream side of the cutter 78.
However, a printing machine 88 is provided between the sensor 86 and the downstream side nipping / conveying roller 64 so as to correspond to the back surface of the printing paper to be printed, so that a printing frame number, image information, etc. can be printed. There is.

 Next, the operation of this embodiment will be described.

When the leading edge of the photographic paper 12 is detected by the loading sensor 26, the motor 40 is driven, and the leading edge of the photographic paper 12 is pinched between the upstream side nipping / conveying rollers 36, 37 and 38 while the photo printing section 14 is being pressed.
The front end of the photographic printing paper 12 conveyed to is detected by the sensor 86,
When the tip slightly projects from the cutter 78, the motor 40 is stopped (see FIG. 3 (A)).

Here, the cutter 78 is operated and the leading end of the photographic paper 12 is discarded.

This state is the standby state, and when the print button (not shown) is operated, the leading edge of the photographic printing paper 12 is downstream from the optical axis L by about 1/2 of the size of the printed image as shown in FIG. 3 (B). It is returned to the state where it reached the side. That is, the motor 40 is rotated in the reverse direction so that the upstream side nipping / conveying roller 36 moves to the upstream side nipping / conveying roller.
The photographic printing paper 12 is returned to the upstream side by the driving force generated between 37 and 38. In this case, the motor 44 operates to bring the guide 42 into the imaginary line state of FIG. 1, and the loop portion 12A corresponding to the returned amount is formed. At the time of this return, the downstream side nipping / conveying roller 64 is in an idling state and does not affect the return driving force of the upstream side nipping / conveying roller 36.

Here, an image is printed on the leading end of the printing paper 12 by the printing light P from a light source that has passed through a negative film (not shown). At the time of printing the image, the mask heads 52 and 54 are separated from each other according to the size of the printed image, but the mask head 54 does not reach the downstream side of the front end of the printing paper 12, and the front end of the printing paper 12 is slightly moved. It is said to be covered only. At the time of printing, the photographic printing paper 12 in the photographic printing section 14 is given an appropriate tension by the combination of the upstream side nipping / conveying roller 36 and the downstream side nipping / conveying roller 64, so that the printed image is not distorted. That is, in the fed state, the feed linear velocity of the downstream side nipping / conveying roller 64 is higher than the feeding speed of the upstream side nipping / conveying roller 36, so that the photographic printing paper 12 is always fed by a tensile force, and is located in the photo printing unit 14. The photographic paper 12 does not cause slack.

Next, as shown in FIG. 3C, the printing paper 12 is sent by a predetermined amount, and the second image frame F2 is printed after the first image frame F1 by the printing light P. In this state, the photographic paper 12
The leading end of the sheet does not reach the cutter 78, but the feed amount is sufficient for printing with the printer 88.

After being printed by the printer 88, the leading edge of the photographic paper 12 is sent to the cutter 78 as shown in FIG.
It is stopped in a state that it projects a little more than 78 (10 mm as an example). Here, the cutter 78 is activated and the leading edge of the photographic printing paper 12 is cut by a short dimension (10 mm as an example), and the leading edge of the printed image (because it is covered with the mask head 54)
The unexposed part is cut off. It is desirable that the cut portion of the cutter is not only the unexposed portion but also a portion that slightly enters the image frame.

Further, as shown in FIG. 3 (E), the photographic printing paper 12 is fed by a predetermined amount, the third frame of image is printed, and the second side of the second frame of image F2 is printed by the printer 88.

As shown in FIG. 3 (F), the photographic printing paper 12 is again fed by a small amount so that the photographic paper 12 is slightly moved into the image from the end of the top image frame F1 and 2 as shown in FIG. 3 (G). The cutters 78 are actuated and the photographic paper 12 is cut for each image in a state where the cutter 78 is slightly inserted into the image from the front end of the image frame F2.

After that, the operations of FIGS. 3E to 3G are repeated to continuously print the image. Therefore, the printed image is sequentially cut by the cutter 78 and processed by the developing unit 18.

The photographic printing paper 12 may be temporarily stopped between FIGS. 3D and 3E and printing may be performed by the printing machine 88.

Next, when the printing operation is interrupted, the photographic paper 12 (corresponding to the image F1 in FIG. 3) cut after cutting the rear end of the last printed image by the operation in FIG. 3 (F). The developing section 18
To the unburned portion, the unburned portion waits in the state shown in FIG. 3 (A), and the state from FIG. 3 (B) is repeated at the time of the next printing operation, whereby the printed image is sequentially developed, and Waste of printing paper can be eliminated.

In the above embodiment, the outer diameter of the downstream side nipping / conveying roller 64 is slightly larger than that of the upstream side nipping / conveying roller 36 in order to increase the feeding speed of the downstream side nipping / conveying roller 64 by a certain amount. However, the downstream nipping / conveying roller 64 has the same diameter as the upstream nipping / conveying roller 36, and the feeding speed of the downstream nipping / conveying roller 64 is slightly larger than that of the upstream nipping / conveying roller 36. May be.

〔The invention's effect〕

Since the present invention is configured as described above, in the case where conveying rollers are provided on the upstream side and the downstream side of the printing unit to enable the return of the photosensitive material, it is possible to eliminate slack of the photosensitive material between these rollers and to perform accurate It has an excellent effect that printing is possible.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a photographic printing apparatus to which the present invention is applied, FIG. 2 is a sectional view showing a one-way clutch used for a downstream side nipping / conveying roller, and FIG. 3 is a photographic paper conveying state in a printing section. FIG. 12 …… Printing paper, 14 …… Photo printing part, 36 …… Upstream side nip transport roller, 64 …… Downstream side nip transport roller, 66 …… One-way clutch, 78 …… Knitter.

Claims (3)

(57) [Claims] 1. A photographic printing apparatus for printing an image on a long photosensitive material in a printing section, comprising: an upstream-side conveying roller which is provided upstream of the printing section and is capable of forward and reverse rotation; and a downstream side of the printing section. A downstream roller that feeds the photosensitive material to the downstream side at a slightly higher linear velocity than the upstream roller to apply tension to the photosensitive material, and that freely rotates when the photosensitive material moves to the upstream side; A photographic printing apparatus having a cutter disposed downstream of the cutter for cutting the photosensitive material between printing images. 2. The downstream roller is formed to have an outer diameter larger than that of the upstream roller, so that the feeding linear velocity of the photosensitive material by the downstream roller is higher than that of the upstream roller. The photoprinting apparatus according to claim 1. 3. The rotational force of the upstream roller is transmitted to the downstream roller via a one-way clutch,
3. The photographic printing apparatus according to claim 1, wherein the downstream roller is rotated together with the upstream roller when the photosensitive material is moved to the downstream side, and is freely rotated when the photosensitive material is moved to the upstream side.