JPH075574A - Structure for holding/identifying enlarging lens for color enlarger - Google Patents

Abstract

PURPOSE:To provide enlarging lens holding structure that a freely turnable turret plate is provided so as to face the inside of the bottom of bellows extended and contracted between a head part and an enlarging lens. Plural enlarging lenses are mounted on the turret plate via lens mounts and a desired enlarging lens is inserted into the optical path of light for printing by the turn of the lens mount and enlarging lens identifying structure that a member to be detected is provided on the lens mount and detected by a lens identifying means, to identify the kind of the enlarging lens. CONSTITUTION:The turret plate 100 is freely turnably provided on a lens substrate 6 on which the bottom of the bellows 9 is detained, in such a manner that the turret plate 100 is supported by a holding roller 103. A proper number of lens mounts 110 are freely attachably/detachably held by the turret plate 100 and the enlarging lenses 10 are held by the lens mounts 110 respectively. A sensor blade 110f is fixed in the proper position of the lens mount 110 and a lens identifying sensor 105 is disposed in a position to detect the sensor blade 110f in a state where the enlarging lens 10 is located in the optical path of the light for printing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to holding a stretcher lens in a color enlarger having a mechanism for holding a plurality of stretcher lenses so that it can be used in a wide range from a large size to a small size. The present invention relates to a structure and an identification structure of an enlargement lens that detects which enlargement lens is used for enlargement and printing.

[0002]

2. Description of the Related Art In a color enlarger, printing light emitted from a light source is diffused by a diffusion box to be diffused, and the diffused light is transmitted to an original plate to be stretched, and further transmitted through an enlargement lens to print on photographic paper. . As the enlargement lens, one having a different focal length is used depending on the size of the original plate used for the enlargement and the enlargement magnification. Therefore, it is necessary to replace the enlargement lens according to the size of the original plate and the enlargement magnification.

In the conventional color enlarger, only a single enlargement lens can be held. Therefore, when exchanging the enlargement lens, the held enlargement lens is removed and then the desired enlargement lens is held. . Then, check the focal length of the stretched lens that was held and stretch it,
Printing work will be performed. At this time, in the case of an automatic focusing type enlarger, the type of enlargement lens held and the enlargement magnification are set.

The focal length and the like of the held enlargement lens must be confirmed and set by an enlargement operator.

[0005]

However, in the case where the enlargement lens is detached and replaced as in the conventional color enlarger, it is troublesome to process a large number of original plates having different sizes and enlargement magnifications. In particular, with a stretcher that can stretch large size original sheets such as sheet film,
In order to be able to process an original plate having a size of 10 films or less, the size of the original plate to be processed becomes large, and the number of types of enlargement lenses corresponding thereto increases, and replacement of these becomes more troublesome. Moreover, when there are various types of enlargement lenses to be replaced, it becomes troublesome to confirm which enlargement lens is attached.

When the types of enlargement lenses to be replaced increase, the enlargement lens with the shortest focal length and the enlargement lens with the longest focal length may have different holding positions. In other words, when performing demagnification, the long focus lens is brought as close as possible to the photographic paper, and when performing enlargement, the short focus lens is brought as close as possible to the original plate. This is because it must be located at.
However, when it is possible to hold a plurality of enlargement lenses on one mount, the bellows between the head portion and the enlargement lenses are extended to perform reduction enlargement, and the long focus lens is used close to the photographic paper. In the case there is no problem,
When the short focus lens is used in close proximity to the original plate for compression and enlargement, even if the bellows is compressed to the minimum, the enlargement lens can be sufficiently brought close to the original plate because of the contraction margin of the bellows. In some cases, the maximum enlargement ratio of the enlargement lens may not be available.

Therefore, according to the present invention, the enlargement lenses can be easily exchanged, and even when a plurality of enlargement lenses are held by one mount, they can be easily exchanged without interfering with each other. An object of the present invention is to provide a stretch lens holding structure of a color stretcher capable of performing the above, and a stretch lens identification structure capable of detecting the type of the stretch lens used for stretching.

[0008]

As a technical means for achieving the above object, the enlargement lens holding structure of the color enlarger according to the present invention should attach the enlargement lens to the lower surface of the head substrate to which the head portion is attached. A bellows is arranged between the upper surface of the lens substrate, and a turret plate is arranged at a position facing the inside of the lower end of the bellows so as to be rotatable about a direction parallel to the optical axis. It is characterized in that an appropriate number of enlargement lenses are detachably mounted on the circumference concentric with the rotation center of the optical axis and intersecting the optical axes.

Further, in order to detect which of the enlargement lenses mounted on the turret plate is being used for enlargement, the lower surface of the head substrate to which the head section is attached and the lens substrate to which the enlargement lens is to be attached are detected. A bellows is arranged between the upper surface, and a turret plate is arranged at a position facing the inside of the lower end of the bellows so as to be rotatable about a direction parallel to the optical axis, so that the enlargement lens can be freely attached and detached. An appropriate number of lens mounts to be held on the turret plate, which is concentric with the rotation center of the turret plate and is detachably mounted in a state where the enlargement lens is located on the circumference where the optical axes intersect,
A member to be detected for identifying the magnifying lens held by the lens mount is provided at a predetermined position of a part of the lens mount, and the member to be detected faces the position where the magnifying lens is inserted in the optical axis. A lens identifying means for identifying the detected member is provided to identify the type of the enlargement lens.

[0010]

Operation: The printing light emitted from the light source is diffused by the diffusion box and becomes diffused light which passes through the original plate. Then, the light passes through the enlargement lens and forms an image on photographic paper.

When changing the enlargement lens, the turret plate is rotated to insert a desired enlargement lens into the optical path of the printing light. Then, when the enlargement lens is inserted, the member to be detected attached to the lens mount of the enlargement lens is located at a position facing the lens identification means, and therefore the type of the enlargement lens is identified by the lens identification means.

Further, since the turret plate is rotatable while being housed inside the lower end of the bellows, the turret plate is located inside the bellows even when the bellows is in the most compressed state. However, the enlargement lens attached to the turret plate can be brought as close as possible to the original plate inside the bellows.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The enlargement lens holding structure and the enlargement lens identification structure of the color enlarger according to the present invention will be specifically described below with reference to the illustrated embodiments.

FIG. 5 and FIG. 6 are views showing the appearance of a color enlarger suitable for having this head portion structure. FIG. 5 is a front view and FIG. 6 is a right side view. A pair of stanchions 2 are fixed to the left and right ends of a gantry 1 installed on the floor surface, and a pedestal plate 3 on which photographic paper is placed is attached to the lower part of the stanchions 2 so as to be vertically movable via a bracket 3a. Has been. A control box 4 containing a control unit such as a CPU is mounted on the gantry 1.

A head substrate 5 is provided above the base plate 3 so as to be able to move up and down along the support column 2, and below the head substrate 5 is a lens substrate 6 that is capable of moving up and down along the support column 2.
Is provided. A light source unit 7 is attached to a base end portion of the head substrate 5 on the support column 2 side, and a head unit 8 is attached to a tip end portion thereof. Further, a bellows 9 whose inside is shielded from light is attached between the lower surface of the head substrate 5 and the upper surface of the lens substrate 6 in a stretchable manner. Also,
An appropriate number of enlargement lenses 10 are held on the lens substrate 6 via a turret plate described later.

As will be described later, the light source section 7 accommodates a light source such as a halogen lamp and a filter driving motor, and these power supply or signal cables are bundled as a light source harness 11a. Further, as will be described later, a light receiving portion, a lens identification sensor and the like are attached to the lens substrate 6, and cables for these power supplies or signals are bundled as a lens harness 11b. The harnesses 11a and 11b are drawn into the control box 4, and a harness cover 11 detachably provided on the outer side surface of the support column 2 between the light source unit 7 and the lens substrate 6 and the control box 3. Is passing through.

A drive mechanism for driving the elevation of the head substrate 5 and the lens substrate 6 is incorporated in a portion between the columns 2 as described later, and lubricating oil of the drive mechanism is scattered. It is inconvenient to attach it to the base plate 3 or the enlargement lens 10. Alternatively, it is inconvenient if the lubricating oil adheres to the worker during the work of placing the printing paper on the base plate 3. Therefore, the dustproof cover 12 is detachably provided between the columns 2 and on the front side. This dust cover 12
Is formed in a flat plate shape with a flexible material so that it can be easily attached and detached when cleaning after use of the enlarger.For example, when pulling out the dustproof cover 12 from above, it is appropriately bent. It is designed so that you can easily pull it out. Also, when the device is mounted from above, it can be easily mounted by gradually inserting it in a bent state.

A drive mechanism for the head substrate 5 and the lens substrate 6 will be described with reference to FIGS. 1 and 7 to 10. Head substrate bracket 51 and lens substrate bracket, respectively, are provided at the left and right rear end portions of the head substrate 5 and the lens substrate 6, respectively, and extend rearward through both sides of the dust cover 12.
61 and are fastened. Left and right head board brackets 51
Is a back plate 52, and the left and right lens board brackets 61 are back boards.
62 are attached to each. A pair of guide sliders 53 and 63 are provided on the left and right ends of the back plates 52 and 62, respectively.
The head drive nut portion 54 is provided at a position offset from the center portion of the back plate 52 to one side, and the lens drive nut portion 64 is provided at a position offset from the center portion of the back plate 62 to the other side. ing.

On the other hand, a pair of guide rods 21 extending vertically are supported along the respective columns 2 near the inside of the columns 2, and the pair of guide sliders are provided.
53 and 63 are slidably fitted on these guide rods 21. Further, between these guide rods 21, a head driving screw 55 and a lens driving screw 65 are appropriately separated, and are rotatably supported about a direction substantially parallel to the guide rod 21 as an axis. Drive nut part 54
Is the head drive screw 55 and the lens drive nut
The lenses 64 are screwed into the lens driving screws 65, respectively.

Pulleys 55a and 65a are fitted to the lower ends of the drive screws 55 and 65, respectively. On the other hand, as shown in FIG. 9, a head drive motor 56 and a lens drive motor 66 are attached to the base plate 2a hung on the lower portion of the support column 2, and the outputs of the drive motors 56 and 66 are respectively output. The pulleys 56a and 66a fitted to the shaft and the above pulleys
Timing belts 57 and 67 are wound around 55a and 65a, respectively.

Further, as shown in FIG. 9, a ratchet 13 is fitted to the lower end portion of the lens driving screw 65 so as to rotate in synchronization with the lens driving screw 65. A lock claw 13a is provided near the ratchet 13.
A rotary solenoid 14 to which the lock solenoid 13 is attached is disposed, and the rotation of the rotary solenoid 14 disengages the lock pawl 13a from the ratchet pawl of the ratchet 13. The lock claw 13a and the ratchet claw are
When the rotary solenoid 14 is turned on, it is disengaged, and when it is turned off, it is engaged. The rotary solenoid 14 is turned off when the power is turned off and the lens drive motor 66 is stopped.

As shown in FIGS. 7 and 8, the head drive nut portion 54 and the lens drive nut portion 64 are hooked with one end portions of band-shaped equal-load springs 15 and 16, respectively. In addition,
Two equal load springs 15a and 15b are hooked on the head drive nut portion 54. The other ends of the equal load springs 15 and 16 are hooked on the drums 15c, 15d and 16a, respectively, and the equal load springs 15a, 15b and 16 are respectively attached to the drums.
It is designed to be wound around 15c, 15d, and 16a. Further, these drums 15c, 15d, 16a are rotatably supported by a bracket 17 provided by being suspended from a ceiling plate 2b hung on the upper end of the support column 2.

As shown in FIG. 8, a tongue piece 22a of the micro switch 22 is provided near one lower end of the guide rod 21.
The tip of the
The micro switch 22 is turned off by contacting the tongue piece 22a when 63 descends to the lowermost end. When the micro switch 22 is turned off, the head drive motor 56 and the lens drive motor 66 are stopped. Furthermore, this guide rod 21
A compression coil spring 23 is fitted to the lower end of the guide slider 63, and when the guide slider 63 descends during normal operation, the guide slider 63 receives the restoring force of the compression coil spring 23 and causes the tongue piece of the micro switch 22 to move. 22a is kept out of contact.

The tip of the tongue piece 24a of the microswitch 24 is located near one upper end of the guide rod 21, and the tongue piece 24a is located when the guide slider 53 moves up to the uppermost end. The microswitch 24 is turned on by touching. When the micro switch 24 is turned on, it is detected that the guide slider 53, that is, the head substrate 5 and the lens substrate 6 have risen to the uppermost end, and the detected position is stored in the control box 4 as a reference point. It is input to the control means such as a CPU.

The light source portion 7 attached to the base end portion of the head substrate 5 is a halogen lamp (not shown) held by a reflector 71 inside a housing 70 as shown in FIGS. 1 and 11 to 14. Such as a light source, filters 72y, 72m, 72c provided in front of the reflector 71 and these filters
A drive mechanism that drives 72y, 72m, and 72c to occupy and retract the optical path of the light source is housed. An opening 70a (see FIG. 14) is formed in the housing 70 in front of the light source,
A shutter blade 77 is swingably provided outside the opening 70a so as to open and close the opening 70a.

The filters 72y, 72m and 72c are individually driven, and the structure of these drive mechanisms will be described. It should be noted that the drive mechanisms are the same, and therefore the same reference numerals are given and described. Behind the reflector 71 inside the housing 70, a filter drive motor 73 having an output shaft 73a protruding rearward is provided.
A drive side pulley 73b is fitted in a. A cam shaft 74 is rotatably supported below the drive motor 73, and a driven side pulley 74a is fitted to the rear end of the cam shaft 74, and the driven side pulley 74a and the driving side pulley 73b. A timing belt 74b is stretched around. Cam shaft 74 above
A cam plate 75 having a cam surface 75a is fitted to the front end portion of the.

On the other hand, a filter shaft 76 is rotatably supported above the cam shaft 74, and the base ends of the filters 72y, 72m and 72c are fitted to the front end of the filter shaft 76. ing. Then, as shown in FIG. 14, the base end of the drive arm 76a is fitted to the center of the filter shaft 76, and the pin 76c planted at the tip of the drive arm 76a has the cam surface 75a. Is in contact with. It should be noted that a tension spring composed of a tension coil spring is provided at an appropriate position of the housing 70 and a part of the drive arm 76a.
76b is bridged, the pin 76c is pressed against the cam surface 75a by the restoring force of the pulling spring 76b, and the drive arm 76a is formed as a positive cam that surely follows the rotation of the cam plate 75.

As shown in FIG. 1, the shutter blade 77 has a tip end portion located outside the housing 70, an intermediate portion appropriately bent, and a base end portion mounted inside the housing 70. It is linked to the shutter drive motor 77a. Then, the shutter blade 77 swings by the operation of the shutter drive motor 77a, and the tip of the shutter blade 77 occupies the front of the opening 70a, whereby the opening 70a is opened and closed.

The head substrate 5 which is the front portion of the light source unit 7
The head portion 8 is detachably attached to the housing 70 at the tip portion of the. As shown in FIG. 15, the head portion 8 is configured by housing a diffusion box 81 in a casing 80. A latch claw 82 is fixed to an appropriate position of the casing 80, and a claw receiving portion 78 that engages with and disengages from the latch claw 82 is provided in the housing 70 of the light source unit 7. The housing 70 and the casing 80 are detachable by engaging and disengaging the claws 82 and the claw receiving portions 78. Further, when the casing 80 is mounted on the housing 70, these connecting portions are surely shielded from light, and there is a gap between the casing 80 and the head substrate 5 in which a carrier described later can be inserted. Is formed. Further, an appropriate opening is formed in a portion of the casing 80, which is opposed to the opening 70a of the housing 70, so that light emitted from a light source enters the casing 80.

The wall of the diffusion box 81 housed in the casing 80 is formed of a diffuse reflection plate, and as shown in FIG. 17 and FIG.
a is formed on the side surface of the roof portion 81a and is a casing.
An opening 81b for introducing printing light is formed in a portion facing the opening formed in 80. That is, the light incident on the diffusion box 81 through the opening 81b is
It is reflected at 81a so as to be directed downward and other directions, and is appropriately diffused. Further, inside the diffusion box 81, a diffusion reflection plate 83 whose vertical position can be adjusted is accommodated in a state where an appropriate gap is formed between the diffusion box 81 and the inner wall of the diffusion box 81. The diffuse reflection plate 83 has, for example, two support rods 83a which are arranged in a casing 81 so as to be vertically movable.
The vertical position of the diffuse reflection plate 83 can be changed by supporting the diffuse reflection plate 83 on the. The support rod
83a is designed such that both ends are insertably and detachably supported by an appropriate number of recesses 83b formed on the inner wall of the diffusion box 81, and the vertical position can be adjusted by changing the recesses 83b to be inserted. Is done. The position of the diffuse reflection plate 83 may be adjusted from the outside of the diffusion box 81.
The bottom plate 81c of the diffusion box 81 is formed of a diffuse transmission plate, and the light transmitted through the bottom plate 81c is diffused and becomes diffused light.
Ejected from 81. In addition, in FIG. 17, reference numeral F indicates an original plate.

In the gap between the lower portion of the casing 80 and the head substrate 5, a carrier 18 holding an original plate is detachably attached. As shown in FIG. 15, when the casing 80 of the head portion 8 has a size suitable for stretching a large-sized original plate, the front end portion of the casing 80 is located near the tip portion of the head substrate 5, 16 is used, the front end portion of the casing 80 is halfway through the head substrate 5, as shown in FIG. In the case of a large-sized original plate, the carrier 18 has a large window portion 18a as shown in FIG. 15, and in the case of a small-sized original plate, a small window portion 18a is used as shown in FIG. . That is, the carrier 18 used by the casing 81 according to the size of the original plate
Is changed. Then, with the carrier 18 mounted, the respective connection portions of the casing 81, the carrier 18 and the head substrate 5 are shielded from light.

Below the head substrate 5, the head substrate 5 is
One end of the bellows 9 is fixed so as to substantially cover the lower surface of the bellows. The other end of the bellows 9 is fixed to the upper surface of the lens substrate 6 so as to substantially cover the upper surface. Therefore, the head substrate 5 and the lens substrate 6 are formed by the bellows 9.
The space between and is shielded, and when the distance between the original plate and the lens substrate 6 is changed, the bellows 9 expands and contracts.

In the portion of the lens substrate 6 facing the original plate,
The enlargement lens 10 is positioned. This enlargement lens 10 is held by a turret plate 100 rotatably supported on the lower surface of the lens substrate 6, and an appropriate number of enlargement lenses 10 are provided.
By holding 10 on the turret plate 100 and rotating the turret plate 100, the desired enlargement lens 10 is positioned in the optical path of the printing light, and the enlargement lens 10 can perform extension. The structure for holding the turret plate 100 and the enlargement lens 10 will be described below.

The upper surface of the lens substrate 6 is shown in FIGS.
As shown in FIG. 5, a cylindrical cover 101 having a bottom plate on the upper side is attached, and a circular through hole 102 is formed in a portion of the lens substrate 6 on which the cover 101 is covered. A through hole 101a is formed in a part of the cover 101 facing the window 18a of the carrier 18 in the mounted state.

On the lower side surface of the lens substrate 6 which is the peripheral portion of the through hole 102, it is arranged on the circumference of a circle concentric with the through hole 102, and an appropriate number is rotatably around the vertical direction. The holding roller 103 is supported. Each of the holding rollers 103 has an hourglass shape having a reduced central portion, and has a conical side surface from the central portion toward the bottom surface. As shown in FIGS. 1B and 2, the disc-shaped turret plate 100 is held by the holding roller 103 and is rotatable. That is, the peripheral surface of the turret plate 100 is formed in a shape that matches the side surface of the holding roller 103, and the peripheral surface of the turret plate 100 is held by the side surface of the holding roller 103. Therefore, the turret plate 100 is guided and rotated by these holding rollers 103, so that the holding roller 103 is at least 4 times the peripheral portion of the turret plate 100.
It is desirable to support the location. Also, this turret board
100 does not have a shaft member at its center, and rotates at a position facing the inside of the lower end of the bellows 9. An appropriate number of operation rods 100a are planted so as to project downward at appropriate positions on the turret plate 100, and a stretching operator operates the operation rods 100a to rotate the turret plate 100.

Then, the light passing through the original plate passes through the optical axis,
An appropriate number of enlargement lenses 10 are attached on the circumference of the turret plate 100 concentric with the center of rotation. 3 and 4 are views showing the mounting structure of the enlargement lens 10, and the mounting structure will be described based on these drawings.

The enlargement lens 10 is a disc-shaped lens mount 11
The lens mount 110 is fixed to the center of the lens mount 110, and a flange 110a is formed at the center in the thickness direction of the lens mount 110 so as to be thinner than the boss 110e of the lens mount 110 and overhangs. A pair of holding portions 110b, which are a part of the flange portion 110a and are opposed to each other, are formed to be slightly thinner than the wall thickness of the flange portion 110a and have a flat surface appropriately finished to be smooth. A notch 110c is formed at one end of each of the holding portions 110b and at a position facing each other, and a recess 110d is formed at the other end. A sensor blade 110f for identifying the type of the enlargement lens 10 held by the lens mount 110 is fixed to an appropriate position of the flange portion 110a.

A through hole 100b into which the boss portion 110e of the lens mount 110 is inserted is formed at a position of the turret plate 100 to which the enlargement lens 10 is attached, and a through hole 100b is formed at a peripheral portion of the through hole 100b. The mount holding member 104 is fixed by a fixing screw 104a or the like. The tip of the mount holding member 104 faces the edge of the through hole 100b,
The tip portion and the lower side surface of the turret plate 100 are separated by a distance corresponding to the thickness of the holding portion 110b of the lens mount 110. The tip of the mount holding member 104 has a width that allows it to pass through the notch 110c of the lens mount 110. Further, a female screw portion 104c that is screwed with the mount fixing screw 104b is formed at the tip portion, and the tip portion of the mount fixing screw 104b is set in the recess 110d formed in the holding portion 110b. I am doing it.

In the lens mount 110 which holds the stretchable lens 10a having a short focal length, the boss portion 110g is formed in a cylindrical shape as shown in FIGS. It is provided so as to project upward. Then, the enlargement lens 10a is attached to the bottom of the boss 110g.
Is fixed. Therefore, the enlargement lens 10 with a short focal length
The a is held in a state of projecting above the turret plate 100, and is located inside the bellows 9.

At an appropriate position on the lens substrate 6,
A lens identification sensor 105 is fixed to the portion where the sensor blade 110f is positioned when the enlargement lens 10 is inserted into the optical axis of the light transmitted through the loaded original plate, and the sensor blade 110f identifies this lens identification. With the sensor blade 110f positioned inside the sensor blade 110f,
Ten focal lengths are identified. Mount the lens mount 110 and the notch 110c
Insert it along the tip of 4 and press it against the turret plate 100, rotate it counterclockwise in FIG.
0c is displaced from the tip of the mount holding member 104,
The tip portion is brought into contact with the other end portion of the holding portion 110b. At this time, the recessed portion 11 of the lens mount 110 is attached to the female screw portion 104c.
0d is facing, and in this state the mount fixing screw 10
When 4b is tightened, the lens mount 110 will turn into the turret plate 100.
Then, the enlargement lens 10 is fixed. The sensor blade 110f in the state where the lens mount 110 is fixed to the turret plate 100 has the lens identification sensor 105f when the enlargement lens 10 is inserted into the optical axis.
It is located so that it fits in.

The upper surface of the cover 101 and the through hole 10
As shown in FIGS. 1 and 2, a light receiving portion 19 is fixed to an appropriate position on the peripheral portion of the la 1a so that the light transmitted through the original plate F is captured by the light receiving portion 19.

The operation of the head portion structure of the color enlarger according to the present invention constructed as above will be described together with the operation of the color enlarger.

The head portion 8 corresponding to the size of the original plate to be stretched is connected to the casing 70 of the light source portion 7 together with its casing 80. Carrier adapted to this casing 80
18, that is, a carrier 18 adapted to the size of the original plate to be stretched holds the original plate, and the carrier 18 is casing.
Load at the bottom of 80.

Further, the boss portion 110e of the lens mount 110 to which the enlargement lens 10 is fixed is attached to the through hole of the turret plate 100.
The notch 110c of the lens mount 110 is inserted into 100b while being aligned with the tip of the mount holding member 104.
The lens mount 110 is rotated counterclockwise in FIG. 3 so that the end of the holding portion 110b is mounted on the mount holding member 10.
4 is brought into contact with the end portion of the holding portion 110b, and the female screw portion 104c
And the recess 110d of the lens mount 110 are matched. Then, by tightening the mount fixing screw 104b, the lens mount 110 is fixed to the turret plate 100, and the enlargement lens 10
Will be fixed to the turret plate 100. The turret plate 100 is gripped by the operation rod 100a and rotated to position the desired enlargement lens 10 below the original plate and insert it into the optical path of the printing light. When the enlargement lens 10 is inserted into the optical path, the sensor blade 110f fixed to the lens mount 110 fixing the enlargement lens 10 fits in the identification sensor 105, and the type of the enlargement lens 10 is detected. This detection signal is input to the control means in the control box 4 via the cable of the harness 11b.

In this state, the enlargement magnification and the number of enlargements are input to the control means from a keyboard (not shown) or the like, and the drive switch or the like is operated to drive the head substrate 5 and the lens substrate 6. When the drive switch is turned on, the head drive motor 56 and the lens drive motor 66 are driven, and the head drive screw 55 and the lens drive screw 65 rotate. A guide slider 53 and a guide slider 63 are slidably fitted to the guide rod 21, and the head drive nut portion 54 and the lens provided on the back plates 52 and 62 on which the guide sliders 53 and 63 are provided. The drive nut portion 64 and the screw 55,
Since the screws 55 and 65 are screwed together, the back plates 52 and 62 are guided by the guide rod 21 to move up and down when the screws 55 and 65 respectively rotate. When the drive switches are turned on, the micro switches 24 are turned on when the back plates 52, 62 are raised and are raised to the highest position. When the micro switch 24 is turned on, the rise of the back plates 52 and 62 is stopped, and these are located at the initial position. And
Since the head substrate 5 and the lens substrate 6 are attached to the back plates 52 and 62, respectively, the light source unit 7 and the head unit 8 attached to the head substrate 5 and the lens substrate 6 are attached.
Enlargement lens 10 mounted on the turret plate 100 via
And rise to the initial position. In addition,
Each of the back plate 52 and the back plate 62 has the equal load springs 15a, 15b,
Since they are pulled up by 16, the load on the motors 56, 66 is reduced when they are raised.

Next, the automatic focus drive is started, and the drive motors 56 and 66 rotate in the opposite direction to the ascending direction, causing the screws 55 and 65 to rotate in reverse. Therefore, the head substrate 5 and the lens substrate 6 are respectively lowered to the position where the photographic paper set on the base plate 3 is focused. At this time, since the head substrate 5 and the lens substrate 6 are separated from each other, the bellows 9 appropriately expands. Further, the head substrate 5 and the lens substrate 6 have equal load springs 15a, 1a.
Screw 5 because it is pulled up by 5b, 16
The backlash between the nuts 54, 64 and the nuts 54, 64 will be eliminated.

When the original plate is reduced at the minimum magnification, the long-focus lens 10 is used as the enlargement lens, and the long-focus lens descends to the state of being closest to the printing paper.
At this time, since the original plate is separated from the long-focus lens, the bellows 9 is stretched to the maximum. On the other hand, when the original plate is magnified at the maximum magnification, a short-focus lens is used as the enlargement lens, and the short-focus lens is closest to the original plate and farthest from the photographic paper. Therefore, the bellows 9 is compressed to the minimum. Further, since the short focus lens 10a is held in a state of protruding above the turret plate 100, even if the bellows 9 is compressed to the minimum, the short focus lens 10a is located inside the bellows 9 and is sufficient for the original plate. Can be approached.

When the drive motors 56 and 66 are stopped due to a power failure or the like while the head substrate 5 and the lens substrate 6 are moving up and down,
The power supply to the rotary solenoid 14 is also stopped. Therefore, the lock claw 13 supported by the rotary solenoid 14
a rotates to occupy the position where the ratchet 13 engages with the ratchet pawl. On the other hand, when the motors 56 and 66 are stopped, the head substrate 5 and the lens substrate 6 descend along the guide rod 21 due to their own weight. As a result of this lowering, the head drive screw 65 and the lens drive screw 65 move to the head substrate 5 and the lens substrate 6.
Will rotate in the direction of lowering. However, since the lock claw 13a occupies the position where the ratchet claw of the ratchet 13 fitted to the lens drive screw 65 is engaged, the lens drive screw 65 slightly rotates to lock the ratchet claw. The rotation of the lens drive screw 65 is blocked and the lowering of the lens substrate 6 is stopped in a state of being engaged with the claw 13a. Further, since the head substrate 5 is located above the lens substrate 6, the descent is stopped while the head substrate 5 is in contact with the lens substrate 6.

Further, the lens substrate 6 is used for automatic focus drive.
Is lowered to the lowest position, the guide slider 63 comes into contact with the compression coil spring 23 fitted to the guide rod 21, so that the micro switch 22 below the compression range of the compression coil spring 23 is not turned off. . Therefore, the motors 56, 66, etc. do not stop in an emergency. However, if there is a problem in stopping the motors 56 and 66,
Since the compression coil spring 23 is compressed more than a predetermined amount, the micro switch 22 is turned off and the motors 56, 66
The power supply to them will be stopped, and these will be an emergency stop.

When the head substrate 5 and the lens substrate 6 stop at predetermined positions and the focus of the enlargement lens 10 comes into focus, the release is started. Prior to the release, necessary ones of the filters 72 are occupied in the optical path of the light source for color correction. The filter 72 is driven by the operation of the filter drive motor 73.

When the output shaft 73a of the filter drive motor 73 rotates, the cam shaft 74 connected to the output shaft 73a by the timing belt 74b rotates. FIG. 14 shows the case where the entire filter 72 occupies the optical path of the light source.
From this state, 74 is supposed to rotate counterclockwise. The cam surface of the cam plate 75 fitted to the cam shaft 74
75a is formed in such a shape that the distance from the cam shaft 74, that is, the diameter gradually increases, and in the state shown in FIG. 14, the pin 76c is pressed against the minimum diameter portion of the cam surface 75a. Camshaft 74
14, the cam plate 75 also rotates in the counterclockwise direction in FIG. 14, so that the pin 76c is gradually separated from the cam shaft 74, and the drive arm 76 in which the pin 76c is planted.
In FIG. 14, a swings counterclockwise around the filter shaft 76, and the filter shaft 76 to which the drive arm 76a is fitted also rotates in the same direction. This filter axis
Since the filter 72 is fitted in the 76, the filter 72 swings counterclockwise in FIG. 14 about the filter shaft 76, and is retracted from the optical path of the light source. Then, the filter drive motor 73 is stopped in the appropriately retracted state, the filter 72 occupies a part of the optical path, and the light of the light source is transmitted through the filter 72.

Note that FIG. 14 has been described assuming that the filter 72 as a whole occupies the optical path with the pin 76c positioned at the minimum diameter portion of the cam surface 75a, but the direction of the restoring force of the pulling spring 76b is shown. In view of this, when the pin 76c is located at the minimum diameter portion of the cam surface 75a, it is preferable that the filter 72 be in a state of being retracted from the optical path. In this case, the cam plate 75
The counterclockwise rotation of 14 causes the filter 72 to gradually occupy the optical path.

When the position of the filter 72 is determined, exposure is started. That is, the shutter drive motor 77a drives the shutter blades 77 to open the opening 70a formed in the housing 70 of the light source unit 7. For this reason,
The light emitted from the light source and transmitted through the filter 72 enters the diffusion box 81 of the head unit 8. In the diffusion box 81, the light incident by the roof portion 81a is reflected downward and diffused. Further, this reflected light is reflected by the diffuse reflection plate 83,
Diffused. And a diffuse reflector of this reflected diffuse light
Light that has passed through the gap between 83 and the inner wall of the diffusion box 81 will pass through the bottom plate 81c formed by the diffuse transmission plate of the diffusion box 81,
The light is diffused and transmitted through the original plate in the carrier 18 mounted on the lower portion of the casing 80 of the head portion 8.

The image transmitted through the original plate is transmitted through the enlargement lens 10, forms an image on the photographic paper on the base plate 3, and is printed on the photographic paper. Then, it is developed and dried to complete the print.

Further, the printing light transmitted through the original plate is the light receiving portion.
Upon entering 19, the color balance is captured. Then, this data is input to the control means, is sent as correction data from the control means to the filter drive motor 73, and the filter 72 is driven to correct the color balance.

When the next original plate is stretched, if the original plate has a size different from that of the original plate that was previously stretched, the casing 81 of the head portion 8 and the carrier 18 are replaced with those suitable for the original plate. . Also, the turret board 100
Is rotated to replace the enlargement lens 10 with a predetermined one.
This rotation can be performed without trouble because the enlargement lens 10 is located inside the bellows 9. Then, when a desired magnification is set and the drive switch is turned on, the original plate is stretched and baked.

[0057]

As described above, according to the enlarging lens holding structure of the color enlarging machine of the present invention, it is rotatable in a position facing the inside of the lower end of the bellows so as to be shielded by the bellows. When a turret plate is provided, a plurality of enlargement lenses are held by the turret plate, and the desired enlargement lens can be inserted into the optical path of the printing light by rotating the turret plate, so that the enlargement magnification is changed. The enlargement lens can be replaced with a simple operation.

Since the turret plate is provided so as to face the inside of the lower end of the bellows, the long focus lens is projected downward from the turret plate and the short focus lens is projected upward from the turret plate. The stretching lens can be held, and the stretching lens can be stretched at the minimum reduction ratio and the maximum enlargement ratio, and the function of the stretching lens can be maximized.

Further, the enlargement lens is held by the lens mount, the lens mount is attached to the turret plate, and a detected member for identifying the enlargement lens is provided on the lens mount, and the enlargement lens is inserted in the optical path of the printing light. In this state, the member to be detected is detected by the lens identifying means. Therefore, if a desired enlargement lens is inserted in the optical path of the printing light, the focal length of the enlargement lens is automatically detected. . Therefore, it is not necessary for the worker who performs the enlargement to check the enlargement lens, and the focal length of the enlargement lens used for the enlargement is surely input to the color enlarger, so that the enlargement work can be simplified.

[Brief description of drawings]

FIG. 1 is a view for explaining a lens holding structure according to the present invention, and is a schematic side view showing an upper structure of a stretcher including a light source section, a head section, and a lens section, with a part cut away;
(B) shows a part of (a) extracted.

FIG. 2 is a schematic view for explaining the holding structure of the enlargement lens, and is a vertical cross-sectional view of the central portion.

FIG. 3 is a bottom view of FIG. 2 showing a relationship between a stretch lens and a lens mount for explaining a stretch lens holding structure and a lens identification structure.

FIG. 4 is a diagram for explaining the relationship between a lens mount and a turret plate that holds the lens mount, and is a schematic cross-sectional view showing a part of FIG. 2 in an enlarged manner.

FIG. 5 is a schematic front view of an automatic focusing type enlarger, showing an example of an enlarger having this lens holding structure.

6 is a schematic right side view of the automatic focusing type enlarger shown in FIG.

FIG. 7 is a rear view of the enlarger for explaining a drive mechanism of the enlarger, in which an intermediate portion is omitted.

8 is a right side view of FIG. 7, which is a cross-sectional view of a central portion cut along a plane in a vertical direction.

9 is a horizontal cross-sectional view of the lower portion of FIG. 7, illustrating the structure of the drive source portion of the drive mechanism.

10 is a rear view of part of FIG. 9 and is a view for explaining the structure of an emergency stop of the drive mechanism.

FIG. 11 is a view for explaining the structure of the light source section, which is a schematic plan view of FIG. 6 with a part cut away.

FIG. 12 is a schematic view for explaining the structure of the light source section, and is a partially cut sectional view of the right side surface.

FIG. 13 is a schematic rear view of the light source section, with a part cut away.

FIG. 14 is a schematic front view of a light source section, with a part cut away.

FIG. 15 is a side view of the head part, showing a part of the light source part together, showing a case where the head part is suitable for a large-sized original plate.

FIG. 16 is a side view of the head part, showing a part of the light source part together, showing a case where the head part is suitable for a small-sized original plate.

FIG. 17 is a right side sectional view for explaining the schematic structure of the diffusion box of the head portion.

FIG. 18 is a schematic sectional view of the back surface of the diffusion box.

[Explanation of symbols]

 3 base plate 4 control box 5 head substrate 6 lens substrate 7 light source part 8 head part 9 bellows 10 enlargement lens 18 carrier 18a window part 19 light receiving part 100 turret plate 100a operation rod 100b through hole 101 cover 101a through hole 102 through hole 103 holding Roller 104 Mount holding member 104a Fixing screw 104b Mount fixing screw 104c Female thread 105 Lens identification sensor (lens identifying means) 110 Lens mount 110a Flange 110b Holding 110c Cutout 110d Recess 110e Boss 110f Sensor blade (Detected member) ) F original plate

Claims (2)

[Claims] 1. A bellows is provided between a lower surface of a head substrate to which a head portion is attached and an upper surface of a lens substrate to which an enlargement lens is to be attached, and the bellows are parallel to the optical axis at a position facing the inside of the lower end portion of the bellows. A turret plate is rotatably arranged around the axis, and an appropriate number of enlargement lenses are detachably mounted on the circumference concentric with the rotation center of the turret plate and intersecting the optical axes. An enlargement lens holding structure of a color enlarger characterized by the above. 2. A bellows is provided between the lower surface of the head substrate to which the head portion is attached and the upper surface of the lens substrate to which the enlargement lens is to be attached, and the bellows is parallel to the optical axis at a position facing the inside of the lower end portion of the bellows. A turret plate is rotatably mounted on the turret plate, and an appropriate number of lens mounts for detachably holding the expansion lens are mounted on the turret plate and concentric with the rotation center of the turret plate. A detection target member that is detachably mounted in a state in which the enlargement lens is located on the circumference where the axes intersect and a member to be detected for identifying the enlargement lens held by the lens mount is provided at a predetermined position of a part of the lens mount. A color identifying the type of the enlargement lens by providing a lens identifying means for identifying the detected member at a position facing the detected means with the enlargement lens inserted in the optical axis. Of the enlarger Shin lens identification structure.