JP3480560B2 - Transport rack for photographic photosensitive materials - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic light-sensitive material transport rack, and more specifically, to a rotatable rack pair for sandwiching and transporting an exposed photographic light-sensitive material. The present invention also relates to a photographic photosensitive material transport rack that can be detachably housed in a processing tank holding a developing solution.

[0002]

2. Description of the Related Art A pair of rollers provided in the above-mentioned conventional transport rack are urged by springs or the like in directions close to each other so as to sandwich the photographic light-sensitive material. A space that opens downward is formed in the attachment portion. Further, in the case of a transport rack intended for photographic paper provided with a printing section (referred to as "back printing section") on the back side (non-emulsion side) of which various data is printed as ink as the photographic light-sensitive material, There is one in which a groove for protecting the back print portion is formed on the peripheral surface of the roller which is in contact with the back side. Normally, this back protection groove is mainly for the purpose of preventing the data printed ink from being erased or spread and making it difficult to read the data. The shallow groove is used to allow contact with the printing paper.

[0003]

In the transfer rack based on the above-mentioned prior art, when the transfer rack is inserted into or removed from the processing tank holding the developing processing solution for the purpose of cleaning the transfer rack or the like, the roller pair is sandwiched. It was observed that even after the space formed in the attachment portion entrains air in the developing solution and the roller pair rotates to start conveying the photosensitive material, bubbles continue to be accumulated in the space. . As a result, there has been a problem that a contact reaction with a developing solution is insufficient in a part of the light-sensitive material and "desensitization unevenness" is observed in the developed photographic light-sensitive material. Incidentally, the above-mentioned groove for protecting the back print portion does not prevent the entrainment of air in advance and does not form a gap having a sufficient width that allows the air once entrained to easily escape upward. .

Therefore, in view of the above-mentioned drawbacks of the transport rack according to the prior art illustrated above, the object of the present invention is to insert the transport rack into and out of the processing tank so that the sandwiching portion of the roller pair is in the developing solution. It is difficult to carry air, or even if it is carried once, the state in which air bubbles are accumulated is eliminated relatively early after the roller pair starts conveying the photosensitive material, and as a result, “desensitization unevenness of the photographic photosensitive material is eliminated. It is to provide a transport rack capable of suppressing ".

Further, in the above-mentioned conventional developing processing apparatus using the transport rack, means for circulating the developing processing solution is provided in order to make the contact reaction of the photosensitive material with the developing processing solution uniform. However, when the circulating means causes a ripple phenomenon on the surface of the developing solution, the oxidation phenomenon of the developing solution due to contact with air is easily promoted. A method has been taken to sufficiently suppress the circulation as compared with the position below the liquid surface. As a concrete method of this method, the baffle plate for protecting the vicinity of the liquid surface from the flow of the liquid rising from the lower part of the processing tank is set in the liquid by setting the capacity of the circulation pump to a necessary and sufficient level. Provided, or provided with a sub-tank separated from the processing tank by a partition wall opened near the liquid level, and a circulation pipe and a pump for forming a circulation path from the lower part of the sub-tank to the lower part of the processing tank, After the liquid in the sub-tank passes through the filter in the sub-tank, it enters the lower part of the processing tank from the circulation pipe and pump, where it rises up to the processing tank and returns to the sub-tank again through the open end of the partition wall. ” And the level of the open end of the partition wall at the same time is set so that the liquid surface of the development processing liquid does not become wavy. Therefore, in any of the methods, defective circulation occurs near the surface of the developing solution and the resulting "desensitization unevenness" (this is due to non-uniformity in the components of the developing solution as well as near the surface of the developing solution). This was also a cause of the phenomenon that the temperature of distant from most of the temperature below). Therefore, there has been a demand for a method of promoting the circulation of the developing solution near the surface of the developing solution without causing the surface of the developing solution to ruffle.

Therefore, another object of the present invention is to
In view of the above-mentioned drawbacks of the above-described conventional development processing apparatus, it is possible to promote the circulation of the development processing solution near the liquid level without causing the surface of the development processing solution to swell as much as possible. To provide a simple transport rack.

[0007]

[0008]

[0009]

[0010]

[0011]

To achieve SUMMARY OF for the] upper Symbol purpose, transport rack according to claim 1 of the present invention, the peripheral surface of at least one roller of the roller pair, labeled photographic photosensitive material back A sub annular groove for protecting the print portion extends endlessly along the circumferential direction of the roller,
In addition, a characteristic feature is that a first annular groove is formed in a part of the peripheral surface of the sub annular groove so as to allow bubbles intervening between the roller pair to escape.

Because of having such a characteristic structure,
In the transport rack according to the first aspect of the present invention, means for printing the number of the image frame which is the source of the exposure and other data on the back surface of the photosensitive material such as photographic paper is provided between the exposure section and the development section. However, since the sub annular groove for protecting the printed back print portion on the back surface of the photosensitive material extends endlessly in the circumferential direction of the roller, ink or the like on which data is printed is erased by the circumferential surface of the roller. It is possible to prevent problems such as being damaged or difficult to decipher by being pushed out (in this case, the back print part may not contact the peripheral surface of the sub annular groove at all, or data may be printed). The ink may be erased by the peripheral surface of the roller, or it may be configured to contact with a weak pressing force that does not make it difficult to read the data when it is spread out). Moreover, the claims of the present invention
In the transport rack according to No. 1 , a sub-annular groove (this may be a shallow groove of about 1 mm or less for the purpose of carrying it)
A first annular groove for letting out air bubbles present between the roller pair on a part of the peripheral surface of the roller (for the purpose of carrying it, a depth of about 2 mm is generally required in combination with the depth of the sub annular groove). ) Is formed, this first annular groove is always a groove "a gap can be formed between the peripheral surfaces of the roller pair" or "a sandwiching surface of the roller pair" regardless of the rotation angle of the roller. To form a passage through which the processing solutions located above and below each other are sandwiched with each other. As a result, it is difficult for the sandwiching portion between the roller pairs to entrain air in the developing solution, or even if they are entrained once, air bubbles have accumulated relatively early after the roller pair has started conveying the photosensitive material. This eliminates the situation and suppresses the "unevenness of desensitization" of the photographic material. Further, it becomes possible to promote the circulation of the developing treatment liquid near the liquid surface without making the surface of the developing treatment liquid ruffle as much as possible.

Here, on the peripheral surface of the sub annular groove, the first
A spiral groove is formed to connect the annular groove to the axial end of the sub annular groove, and the spiral groove is configured to move the bubbles in the sub annular groove to the first groove in response to rotation of the one roller. It can be configured to be able to guide up to one annular groove. According to this structure, the air accumulated on the peripheral surface of the sub annular groove, which normally has a depth insufficient as a passage for allowing the bubbles to escape directly above the roller pair, is removed from the air above the roller pair. It is possible to quickly guide to the first annular groove having a sufficient depth as a passage for direct escape.

Other features and advantages of the present invention include:
It will be apparent from the following description of the embodiments with reference to the drawings.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a developing processing apparatus for a photosensitive material according to the present invention will be described with reference to the drawings.

(Overall Structure of Development Processing Apparatus) FIG. 1 shows a development processing apparatus using photographic paper as a photosensitive material, which has a printing exposure section 1 and a development processing section 3. Among them, the printing exposure unit 1 is mainly composed of a paper magazine 5 accommodating the photographic printing paper 4 wound in a roll shape, and a conveyance device 7 mainly composed of a conveyance belt.
(12, 13), light source 8 for exposure, mirror tunnel 9,
The negative mask 10 and the lens unit 11 have a known structure. A part of the transport device constitutes an exposure table 7, and the photographic printing paper 4 printed on the exposure table 7 is transported in the direction of the arrow by the transport device 12 and developed by a plurality of transport rollers 13. Sent to department 3. The development processing section 3 includes a development processing tank 14 including a plurality of tanks for storing the development processing liquid. The photographic printing paper 4 that has passed through the development processing unit 3 is sent to the drying processing unit 15, and is appropriately dried while the photographic printing paper 4 passes through the transport path of the same. The dried photographic printing paper 4 is discharged from the outlet portion 16 and aligned in the state of photographic sheets cut into appropriate dimensions. The cutting unit for cutting the roll-shaped photographic printing paper 4 into a sheet form is a position between the paper magazine 5 and the exposure table 7, or an outlet unit 16.
It can be provided in the vicinity.

(Structure of Development Processing Tank) The development processing tank 14 is
The inside is partitioned into a plurality of parts by partition walls 14a. 2 illustrates one of the development processing tanks 14 partitioned by the partition wall 14a. As understood from FIG. 2, a processing rack 20 having a height corresponding to the depth of each processing tank 14 is stored for each processing tank 14. Each processing rack 20 is housed in each processing tank 14 so as to be removable from the vertical direction. A plurality of sets of conveying rollers 22a, 22b, 22b arranged vertically in the processing rack 20 are
The photographic printing paper 4 is passed through the development processing liquid in each processing tank 14 by being rotated in a predetermined direction (arrow in FIG. 2) by the drive mechanism. Here, the transport roller 22a arranged in the center
Is referred to as the center roller 22a, and the center roller 22a
Conveyor roller 2 arranged so as to sandwich a from both sides
2b and 22b are referred to as side rollers 22b and 22b.
Each pair of side rollers 22b and 22b is constantly urged toward the center roller 22a arranged between them by the action of a coil spring (not shown). Center roller 22a, side rollers 22b, 22
The portion forming the peripheral surface together with b is formed of a rubber or elastomer material having both elasticity and chemical resistance.

When the photographic printing paper 4 is conveyed, the center roller 22a is always in contact with the back surface of the photographic printing paper 4, and the side rollers 22b, 22b are in contact with the front surface of the photographic printing paper 4, ie, the emulsion surface.

(Structure and Function of Center Roller) As best shown in FIGS. 8A and 8B, the center roller 22a is provided.
A large number of annular grooves are formed on the entire peripheral surface of the sandwiching area for sandwiching the photosensitive material. A first annular groove Da1 formed in the center of the center roller 22a in the axial direction.
Has a width of 4 mm and a depth of 2 mm (however, the side roller 22
It is the depth when the peripheral surfaces Pa1 to Pa6 that are positively contacted with b are taken as a reference). And the first annular groove D
The two sub annular grooves Db, Db arranged on the left and right of a1 are
The width is 5.5 mm and the depth is 1 mm. That is,
In other words, a shallow 1 with a width of 15 mm and a depth of 1 mm.
A shallow first annular groove Da1 having a width of 4 mm and a depth of 1 mm is formed in the center of the sub annular groove Db.

The innermost pair of first sandwiching peripheral surfaces Pa1, P
A pair of second annular grooves Da2, Da2 are formed on both sides of the sub annular groove Db with a1 interposed therebetween. Furthermore, a pair of second
Second annular grooves Da2, D sandwiching the sandwiching peripheral surfaces Pa2, Pa2.
A pair of third annular grooves Da3, Da3 are formed on the outer side of a2. Further on the outer side thereof, similarly, the third sandwiching peripheral surface Pa3, the fourth annular groove Da4, the fourth sandwiching peripheral surface Pa4, the fifth annular groove Da5, the fifth sandwiching peripheral surface Pa5, the sixth annular groove Da.
6, and the sixth sandwiching peripheral surface Pa6 is arranged in pairs in order. Here, the depth is as shallow as 1 mm and the width is about 15
The sub annular groove Db having a width as large as mm is a groove for protecting the back print portion printed on the back surface of the photographic printing paper 4 from being erased by the peripheral surface of the roller or being spread and becoming difficult to read. is there. The back print section prints the number of the image area and other data that is the source of the exposure on the back side of a photosensitive material such as photographic paper.A mechanism for printing this should be provided between the exposure section and the development section. You can Sub annular groove D
b may be configured such that it does not come into contact with the back surface of the photographic printing paper 4 including the back print portion at all, or the ink or the like on which the data is printed is erased or spread by the peripheral surface of the roller and the data is not difficult to read. The structure may be such that they are brought into contact with each other with a weak pressing force.

Further, the first to sixth annular grooves Da1 to Da6 having a deep total depth of 2 mm have a function of preventing bubbles from accumulating in the lower part of the nip portion of the roller pair and the roller pair of the roller pair. It has a function of promoting the circulation of the developing solution near the peripheral surface. That is, the first to sixth annular grooves Da1 to Da6 distributed over the entire surface of the sandwiching area of the peripheral surface of the center roller 22a form a gap between the peripheral surfaces of the roller pair, so that the transport rack 20 is not supported. When inserting into the processing tank 14, even if the downwardly open space formed in the sandwiched portion with the side roller 22b tries to entrain air lumps (or air bubbles) into the development processing liquid, this air is When entering below, it is easy to escape upward through the first to sixth annular grooves Da1 to Da6. Even if the bubbles cannot immediately escape upward because the size of the gap formed by the groove is smaller than the tension acting on the interface between the air lump and the developing solution, even if the bubbles cannot immediately escape upward. The water pressure that increases accordingly reduces the diameter of the bubbles or increases the buoyancy applied to the bubbles, so that at least most of the bubbles eventually escape upward from the groove.

Further, the first to sixth annular grooves Da1 to Da6 provided over the entire surface of the sandwiching area on the peripheral surface of the center roller 22a form a gap between the peripheral surfaces of the roller pair, so that the development is performed. The processing liquid is provided with a path that moves from the upper side to the lower side or from the lower side to the upper side with the sandwiching surface of the roller pair interposed therebetween. As a result, it is possible to promote the circulation of the developing solution especially near the surface of the liquid, without making the surface of the developing solution as wavy as possible. Also, the first
From the respective sandwiching peripheral surfaces Pa1 to C1 of the center roller 22a obtained by forming the sixth annular grooves Da1 to Da6 from
The end surface extending from Pa6 toward the inner diameter side and the peripheral surface forming the groove (or the bottom surface, that is, the peripheral surface having a diameter smaller than the outer peripheral surface) are located above the clamping surface of the roller pair 22a, 22b. From above to below or from below to above. Therefore, the roller pair 22a, 2
Forced substitution occurs between the development processing liquids located above and below the sandwiching surface of 2b, which has the effect of further enhancing the stirring action. The first to sixth sandwiching peripheral surfaces Pa1 to Pa6 are provided on the side rollers 22b and 2b.
It is a portion having the maximum diameter in the peripheral surface for nipping and conveying the photographic printing paper 4 in cooperation with 2b, that is, the center roller 22a. The positions of the first to sixth annular grooves Da1 to Da6 in the axial direction are such that both ends in the width direction of several types of commonly used photographic papers having different width dimensions have the first to sixth clamping circumferences. It is set so as to be supported near the center of the surfaces Pa1 to Pa6. This is because, if the widthwise edge of the photographic paper coincides with the position of the annular groove, the edges of the rotating groove may twist these edges, causing folds. Is.

(Function of Overhead Rack) By the way, the overhead rack 2 is provided on each processing rack 20.
5 is detachably installed, and a pair of conveying rollers 27a, 2 provided on the inlet side of the overhead rack 25.
7b is a conveyance roller 22a of the processing rack 20, 22b,
The photographic printing paper 4 is guided to the processing tank 14 in which the respective processing racks 20 below are immersed, in conjunction with the same peripheral speed as 22b. Further, another pair of conveying rollers 27c and 27d provided on the outlet side of the overhead rack 25 are also interlocked with the conveying rollers 22a and 22b at the same peripheral speed, and the photographic paper 4
Is drawn from the processing tank 14 and is guided to the corresponding processing rack 20 via the next overhead rack 25 adjacent to the lower side. Transport roller 27 on the inlet side
The tangent line between a and 27b and the conveying roller 27 on the exit side
The tangent line between c and 27d is the processing rack 2
It is inclined toward the guide surfaces 15a and 15b provided at the center of 0. Incidentally, the transport rollers 27c and 27d are always urged in a direction in which they approach each other by the action of a coil spring (not shown).

(Driving Mechanism of Each Conveying Roller) As best shown in FIGS. 3 and 5, a stationary support shaft 62 is horizontally provided on the upper portion of the processing rack 20, and the tip of this support shaft 62 is provided. A drive gear 64 is rotatably supported in the vicinity. Further, a transmission gear 74 and a bevel gear 66 are externally fitted onto the support shaft 62 so as to rotate integrally with the drive gear 64. Therefore, the rotational movement in the direction of the arrow in FIG. 4 obtained by the drive gear 64 by a drive mechanism (not shown), on the other hand, meshes with the transmission gear 74, the transmission gear 76 interlocked with the transmission gear 74, and the transmission gear 76. , Via the input gears 78b, 78c on the overhead rack 25, are transmitted to the conveying rollers 27b, 27c, and at the same time, the conveying rollers 27a, 78d directly meshed with the input gears 78b, 78c are directly connected to the conveying rollers 27a, 78d. 27d
Are rotated in the opposite directions to the transport rollers 27b and 27c, respectively. On the other hand, the rotational movement of the drive gear 64 in the arrow direction is, on the other hand, the bevel gears 66, 68 and the bevel gear 6
8, a transmission shaft 70 directly connected to the transmission shaft 70, and bevel gears 72, 72 ,. ． Via the transport rollers 22a, 22a ,. ． Rotate the
At the same time, each of the transport rollers 22a, 22a ,. ． And the conveying rollers 22b, 2 that press the peripheral surfaces against each other.
2b ,. ． Each of the transport rollers 22a, 22a ,. ． Is rotated in the opposite direction.

(Detachment operation of overhead rack) FIG. 3
As best shown in FIG. 1, a handle 122 is provided at the upper end of the processing rack 20 so that the processing rack 20 can be easily inserted into and removed from the processing tank 14. Then, as shown in FIGS. 3 and 6, the overhead rack 25 is configured to be supported on the handle 122 of the processing rack 20 while straddling (saddling) in a saddle shape.
In addition, the transport rollers 2 inside the overhead rack 25
An engaging recess 28 that can receive the handle 122 from below is formed between 7b and 27c, and the posture of the overhead rack 25 with respect to the processing rack 20 cooperates with the handle 122 and the engaging recess 28. A posture guide mechanism for restricting the More specifically, the posture guide mechanism includes a handle 122 itself provided on the side of the processing rack 14 and support members 124 and 124 that support the handle 122 to the processing rack 14. The handle 122 itself includes the carry-in rollers 27a and 27b.
Also, it has a surface that extends laterally in parallel to the respective axial cores of the carry-out rollers 27c and 27d, and this surface regulates the angular posture and position of the overhead rack 25 with respect to the processing rack 20 in a plan view. On the other hand, the support members 124, 124 are
As shown in FIG. 6A, it has a surface vertically extending downward from the handle 122, and this surface regulates the angular posture of the overhead rack 25 with respect to the processing rack 20 in a side view.

The engagement recess 28 of the overhead rack 25 is specifically as shown in FIGS.
It includes a pair of vertically extending plate members 112 and 116. The plate-shaped member 112 particularly protrudes above the other plate-shaped member 116. The plate-shaped member 112 and the plate-shaped member 114 that similarly projects from the lower side of the plate-shaped member 112 function as a pair of knobs when the overhead rack 25 is attached to and detached from the processing rack 14. . When both of the knobs (plate-shaped members) 112 and 114 are simultaneously pinched by hand, the knob (plate-shaped member) 112 on the side where elastic deformation easily occurs.
Is configured to elastically deform toward the other knob (plate-shaped member) 114 side, but the elastic deformation region of the knob (plate-shaped member) 112 functions as the engaging recess 28 of the plate-shaped member 112. It is limited to the upper half to fulfill. A claw member 112a projects horizontally from a part of the knob 112, while a chamfered cam surface 122b is formed on the upper end of the handle 122.

Therefore, first, as shown in FIG. 6A, the engaging recess 28 of the overhead rack 25 is arranged on the handle 122, and as shown in FIG.
When the engaging recess 28 of No. 5 is straddled by the handle 122 and the overhead rack 25 is further lowered, the engaging recess 28
Are guided vertically by the vertical surfaces of the support members 124,124. When it is further lowered, as shown in FIG. 6C, the claw member 112a that horizontally projects from the knob 112 of the overhead rack 25 slides down along the cam surface 122b, and finally rides over the cam surface 122b, and the claw member 11
2a, due to its elastic recovery force, enters the fitting recess 122a formed in the handle 122 as shown in FIG. 2 and FIG.
The work of mounting the device in the state of retaining it against 0 is completed.
The fitting recess 122a and the cam surface 122b formed on the handle 122, and the claw member 112a formed on the knob 112 of the overhead rack 25 cooperate to move the overhead rack 25 relative to the processing rack 20. It constitutes a locking means for restricting this. Further, if the overhead rack 25 is lifted while releasing the claw member 112a from the downward surface by manually picking the knobs 112 and 114, the overhead rack 25 can be pulled out from the processing rack 20 as shown in FIG. You can As shown in FIGS. 3, 4, and 5, plate-shaped projections 11 horizontally projecting in the left and right directions are provided near the upper ends of the left and right ends of the overhead rack 25.
0, 110 are provided and cooperate with receiving recesses 120, 120 provided at the upper end of the processing rack 20 to determine the relative position of the overhead rack 25 with respect to the processing rack 20 in the horizontal and vertical directions.

(Structure of Packing for Conveyor Rollers) As shown in FIG. 7, packing holders 26a and 26b are detachably attached to the inlet side and the outlet side of the overhead rack 25, respectively. Through these packing holders 26a and 26b, packings 50 and 52 made of elastic material are detachably engaged. Packing 5
0 and 52 are the transport rollers 27a and 27d, respectively.
A function of scraping off the excess developing treatment solution adhering to the peripheral surface of the processing rack 20 and dropping it into the processing rack 20. When the overhead rack 25 is installed on the processing rack 20, the transfer rollers 27a and 27d and the processing rack 20 are It has a function of blocking a gap formed between the two and preventing a part of the development processing liquid from evaporating to the outside from this gap.

(Structure of Packing for Processing Rack) As shown in FIG. 7, between the processing rack 20 and the processing tank 14,
A gap extending in the vertical direction is formed, and an elastic packing 30 is provided near the upper end of the processing rack 20 for the purpose of separating the gap from the outside. The packing 30 made of an elastic material such as an elastomer is provided with a base end portion 30a having a generally rectangular ring shape and a substantially rectangular cross section, and a projection portion 30b extending obliquely downward from the base end portion 30a and extending radially outward. . In addition, an annular groove 20a is formed all around the processing rack 20.
Is formed, and the base end portion 30a is formed in the annular groove 20a.
Locked inside.

Further, between the processing rack 20 and the processing tank 14, there is provided a positioning mechanism for keeping the relative position of both members in the vertical direction and the relative position in the lateral direction constant. As shown in FIG. 3, this positioning mechanism includes a support shaft 36 of the input gear 34, and a pair of contacted abutting portions 38, 38 provided on the opposite side of the support shaft 36. A support part (not shown) provided on the processing tank 14 side to support the contact part 36 and the contacted parts 38, 38.
Also includes. Here, when the base end 30a of the packing 30 is locked in the annular groove 20a and the processing rack 20 is housed in the processing tank 14, the protrusion 30b is formed on the upper end surface of the partition wall 14a of the processing tank 14. 14b is approached from above, and when the storage is completed, a part of the tip end side of the protrusion 30b is located on the upper end surface 14b.
It is pressed against and elastically deformed, and a close contact state as shown in FIG. 7 is obtained between the upper end surface 14b and the upper end surface 14b.

[Other Embodiments] <1> The “grooves that form a gap between the peripheral surfaces of the roller pairs” are not necessarily endless grooves that are continuous in the circumferential direction, and are illustrated in FIG. So that the center roller 122a
Grooves Dc, D distributed intermittently along the circumferential direction of the roller and over the entire surface of the sandwiching region of the roller circumferential surface.
c ,. ． ． But good. In this case, the function of preventing bubbles from accumulating in the lower part of the nip portion of the roller pair has the function of depending on the angular position of the center roller 122a.
22a, but it does not work until the rotation driving operation of 22a is performed, while each groove Dc, Dc ,. ． ． The end surface extending in the radial direction along the axial center of the rollers to form a roller serves as a rotor for stirring the developing solution, and thus promotes circulation of the developing solution near the peripheral surface of the roller pair. The function is further enhanced than the above embodiment.

<2> The “groove forming a gap between the peripheral surfaces of the roller pair” is not limited to an endless groove continuous in the circumferential direction, and a center roller may be used as illustrated in FIG. A combination of a plurality of annular grooves extending endlessly along the circumferential direction of the 222a and a spiral groove extending simultaneously in the circumferential direction of the center roller 222a and the axial center direction may be combined. The center roller 222a of FIG. 10 has a shallow sub annular groove Db having a depth of 1 mm and a depth of 2 as in the above embodiment.
Although the first to sixth annular grooves Da1 to Da6 having a relatively large depth of mm are formed, the center roller 222a further connects the first annular groove Da1 to the axial end of the sub annular groove Db. A spiral groove Dd having a total depth of 2 mm is formed. That is, the spiral groove Dd is formed by the center roller 22.
According to the rotation of 2a, the bubbles staying at any position in the sub annular groove Db are forcibly guided to the first annular groove Da1 having a depth of 2 mm, and the bubbles are passed through the first annular groove Da1 through the roller pair. Release from the bottom up.

<3> The “grooves that form a gap between the peripheral surfaces of the roller pair” are not on the center roller but on the peripheral surfaces of both the pair of side rollers provided so as to sandwich the center roller. It may be provided.

[Brief description of drawings]

FIG. 1 is a schematic side view of a development processing apparatus according to the present invention.

FIG. 2 is a schematic side view of a main part of the development processing apparatus of FIG.

FIG. 3 is a perspective view of a processing rack and an overhead rack.

FIG. 4 is a perspective view of an overhead rack attached to a processing rack.

FIG. 5 is a cutaway front view of a main part of the development processing apparatus of FIG.

FIG. 6 is a diagram showing an overhead rack mounting process.

FIG. 7 is an enlarged view of the main parts of the processing rack and the overhead rack.

FIG. 8 is a partially cutaway front view and a cutaway side view showing one of the center rollers according to one embodiment of the present invention.

FIG. 9 is a perspective view of a center roller according to another embodiment.

FIG. 10 is a perspective view of a center roller according to still another embodiment.

[Explanation of symbols]

1 Printing exposure section 3 Development processing section 4 photographic paper 14 Development tank 14a partition wall 20 processing racks 22a Center roller 22b Side roller Da1 to Da6 first to sixth annular grooves Db Sub annular groove

Continuation of the front page (56) Reference JP-A-2-232656 (JP, A) Actual opening Sho 58-162146 (JP, U) Actual opening Sho 47-17053 (JP, U) Actual opening Flat 6-60853 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03D 3/00-15/10

Claims (2)

(57) [Claims] 1. A photograph having a rotatable roller pair for nipping and carrying an exposed photographic light-sensitive material, and being removably housed in a processing tank holding a developing solution. A transport rack for a photosensitive material, wherein a sub-annular groove for protecting a back print portion described on the photographic photosensitive material is provided along the circumferential direction of the rollers on the circumferential surface of at least one roller of the roller pair. A transport rack for a photographic light-sensitive material, which is endlessly extended, and has a first annular groove formed in a part of a peripheral surface of the sub annular groove for allowing bubbles existing between the roller pair to escape. 2. A spiral groove that connects the first annular groove to an axial end of the auxiliary annular groove is formed on a peripheral surface of the auxiliary annular groove, and the spiral groove is the one roller. in response to the rotation, the transport rack of the photographic light-sensitive material according to claim 1 wherein the air bubbles in the secondary annular groove can be guided to the first annular groove.