JP2003186166A - Developing and processing device for photosensitive material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely transport photosensitive materials and to suppress the passing of a processing liquid to the minimum. <P>SOLUTION: The contact position P1 of a lower edge 57b of a slit hole 57 and a tip 53a of a blade 53 is located at a portion slightly protruding to the side of the blade 53, with respect to a sensitive material transportation path 74. The tips of first to fourth guide planes 54a, 59, 72a and 73a are respectively positioned inside circles 83 and 85 having a radius 100 mm and circles 84 and 86 having a radius 30 mm. Since the relative position relation of an in-liquid squeeze part, a transportation member and a transportation guide member is precisely specified, the sensitive materials are surely transported and passing of the processing liquid can be suppressed to the minimum. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive material development processing apparatus incorporated in an automatic developing machine such as a printer processor.

[0002]

2. Description of the Related Art An automatic developing machine such as a printer processor used in a photo lab has an exposure processing apparatus for exposing a photosensitive material such as photographic paper and a developing processing apparatus for developing an exposed photosensitive material. Is incorporated inside. Usually, the developing device is provided with a carrying member for carrying the photosensitive material on which the frame image is exposed, and a plurality of processing tanks containing a processing solution for color development, bleach-fixing, washing and stabilizing, The photosensitive material is conveyed to the processing tank by the conveying member, and development processing is performed by sequentially passing through each processing solution.

In the conventional processing tank, a so-called crossover structure has been adopted in which the photosensitive material is once carried over the air when it is carried from the previous tank to the next tank. In order to shorten the development processing time by shortening the length, a submerged squeeze portion by a partition member such as a blade is provided on the partition wall between the processing tanks, and the photosensitive material is conveyed in the liquid through the submerged squeeze portion. A method has been proposed.

In the photosensitive material development processing apparatus using the above-described submerged conveying method, usually, a pair of conveying rollers for nipping and conveying a photosensitive material between upper and lower rollers as a conveying member are provided on the upstream side and the downstream side of the submerged squeeze portion. It is located on the side. In this case, the photosensitive material is carried from the previous tank to the submerged squeeze portion by the upstream conveying roller pair, and is discharged from the submerged squeeze portion to the next tank by the downstream conveying roller pair. Further, there is also one in which a conveyance guide member having a guide surface for guiding the tip of the photosensitive material is provided between the submerged squeeze portion and these conveying roller pairs to ensure the conveyance of the photosensitive material. .

In the light-sensitive material development processing apparatus having the above-described structure, the submerged squeeze portion is provided in the main body of the washing tank, whereas the pair of conveying rollers is provided from the main body of the washing tank so that the apparatus can be easily maintained. It is usually provided integrally with a removable transport rack.

[0006]

However, in the above-described photosensitive material development processing apparatus, the squeeze portion in liquid and the conveying roller pair which is a conveying member are provided separately and do not meet the same standard. An error occurs in the position, the conveyance resistance of the photosensitive material that passes through the submerged squeeze portion increases and the conveyance ability of the device decreases, and the gap between the photosensitive material and the partition member of the submerged squeeze portion occurs. There is a problem that the processing liquid flows out from the device and the processing capacity of the apparatus is lowered. In addition, since the relative positional relationship between the submerged squeeze portion, the transport member, and the transport guide member is not specified, the photosensitive material does not pass through the regular transport path due to poor transport, and its edge is the guide surface of the transport guide member. It will be damaged by touching
There are problems that the quality is deteriorated and the photosensitive material is clogged.

According to the present invention, the relative positional relationship among the submerged squeeze portion, the conveying member, and the conveying guide member is defined,
An object of the present invention is to provide a photosensitive material development processing apparatus which reliably conveys a photosensitive material and suppresses the passage of a processing liquid to a minimum.

[0008]

In order to achieve the above object, the present invention is provided in a partition wall between a plurality of processing tanks in which a processing liquid is stored, and has a main body having an opening and the inside of the opening. A submerged squeeze portion which is composed of a partition member and elastically contacts the tip of the partition member with the edge of the opening to allow passage of the photosensitive material and prevent passage of the processing liquid; In a photosensitive material development processing apparatus including a first conveying member that conveys a photosensitive material to a submerged squeeze portion and a second conveying member that conveys a photosensitive material from a submerged squeeze portion, an edge portion of the opening and a partition member. The contact position with the front end of the sheet is defined at the same level position with respect to the photosensitive material conveying path connecting the first conveying member and the second conveying member, or a position slightly protruding toward the partition member side.

The main body includes a holding member for holding the partition member, and a first guide for guiding the leading end of the photosensitive material to the contact position at a position of the holding member facing the photosensitive material conveying path. A second guide surface that forms a surface and guides the leading end of the photosensitive material to the contact position at a position facing the photosensitive material transporting path of the edge portion. The first guide surface and the second guide surface Are formed so that the distance between them gradually increases toward the first conveying member, and they pass through the contact point between the first conveying member and the photosensitive material, and on the first guide surface side orthogonal to the photosensitive material conveying path. The tip of the first guide surface is installed in a circle having a center on a perpendicular line and having a radius of 100 mm with the photosensitive material transport path as a tangent line, and passes through a contact point between the first transport member and the photosensitive material to pass through the photosensitive material. Second guide orthogonal to the transport path Has centered on the vertical line of the side, the photosensitive material conveyance path be placed the tip of the inside circle of radius 30mm second guide surface that the tangent preferred.

A transport guide member is provided between the contact position and the second transport member, and the transport guide member is provided with:
A third guide surface for guiding the photosensitive material to the second transport member on the side of the partition member with respect to the photosensitive material transport path, and a photosensitive material on the edge side with respect to the photosensitive material transport path. A fourth guide surface for guiding to the second conveying member is formed, and the third guide surface and the fourth guide surface are formed so that the interval gradually increases toward the submerged squeeze portion, The tip of the third guide surface is located within a circle having a center on a third guide surface perpendicular to the photosensitive material transport path and passing through the contact position, and having a radius of 100 mm with the photosensitive material transport path as a tangent line. Installed, passing through the contact position,
It is preferable that the tip of the fourth guide surface is set in a circle having a center on a perpendicular line on the side of the fourth guide surface orthogonal to the photosensitive material transport path and having a radius of 30 mm with the photosensitive material transport path as a tangent line.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the outline of the internal configuration of a printer processor in which the photosensitive material developing processing apparatus of the present invention is implemented. The printer processor 2 includes a printer unit 3 and a processor unit 4. The printer unit 3 includes a magazine 5, a cutter 6, a back printing unit 7, an exposure unit 8, and a sorting unit 9. Belt-shaped photosensitive material 10 set in magazine 5
Is cut by the cutter 6 according to the print size,
It becomes a cut sheet-shaped photosensitive material 10a (see FIG. 3).
The photosensitive material 10a is conveyed on a conveying path 1 indicated by a chain double-dashed line in the figure.
4 is conveyed toward the exposure unit 8 and the back side printing unit 7 prints the frame number and the correction data on the way. Then, an image based on the image data is exposed and recorded on the light receiving surface of the photosensitive material 10a by the exposure unit 8. Then, the exposed light-sensitive material 10a is arranged in two rows by the sorting unit 9 and is conveyed to the processor unit 4 with the emulsion surface on the upper side and the support on the lower side.

The processor section 4 comprises a photosensitive material developing and processing apparatus 11, a drying apparatus 12 and a sorter section 13. As shown in FIG. 2 in detail, the photosensitive material developing processing apparatus 11 includes a developing tank 21, a bleach-fixing tank 22, a first washing tank 23, a first washing tank 23, and a first washing tank 23 in order from the upstream side (the left side in the drawing) of the conveying path 14. A water washing tank 24 including a second water washing tank 24, a third water washing tank 25, and a fourth water washing tank 26 is provided. A developer is stored in the developing tank 21, a bleach-fixing solution is stored in the bleach-fixing tank 22, and a predetermined amount of the washing solution is stored in the washing tank 27. Developing tank 21
Further, inside the bleach-fixing tank 22, there is provided a carrying rack 28 composed of a plurality of carrying rollers for carrying the photosensitive material 10a in a substantially U-shape inside the tank.

Above the developing tank 21, a pair of carrying rollers 29 for carrying the photosensitive material 10a from the printer section 3 into the developing tank 21, and a carrying roller for carrying the developed photosensitive material 10a to the bleach-fixing tank 22 side. Pair 30 is provided. Similarly, above the bleach-fixing tank 22, a pair of conveying rollers 31 for conveying the photosensitive material 10a conveyed from the developing tank 21 side into the bleach-fixing tank 22 and the fixing-processed photosensitive material 10a in the first washing tank. Transport roller pair 3 for transporting to the 23 side
Two are provided. Further, above the first washing tank 23, there is provided a pair of conveying rollers 33 for conveying the fixed photosensitive material 10 a into the first washing tank 23. The liquid outside squeeze portion 38 is formed by these conveying roller pairs 30 to 33.
(A portion surrounded by a chain double-dashed line in the figure) is configured so that the processing liquid adhering to the photosensitive material 10a is not brought into the next tank. Above the fourth washing tank 26, there is provided a conveying roller pair 34 for conveying the washed photosensitive material 10a to the drying device 12. Each of the first washing tank 23 and the fourth washing tank 26 is provided with a conveying roller pair 35 as a means for conveying the photosensitive material 10a.

A partition 39 between the first and second washing tanks 23 and 24, a partition 40 between the second and third washing tanks 24 and 25,
An in-liquid squeeze portion 42 is provided on each of partition walls 41 of the third water washing tank 25 and the fourth water washing tank 26. A conveying roller pair 36 as a first conveying member is provided on the upstream side of each submerged squeezing section 42 to carry the photosensitive material 10a from the previous tank into the submerged squeezing section 42, and on the downstream side. A pair of transport rollers 37 as a second transport member for transporting the photosensitive material 10a from the submerged squeeze portion 42 to the next tank are provided. In addition, each submerged squeeze part 4
A transport guide member 71 that guides the tip of the photosensitive material 10 a from the submerged squeeze portion 42 to the transport roller pair 37 is provided between the second transport roller pair 37 and the transport roller pair 37. Although illustration is omitted because it becomes complicated, the pair of transport rollers 35 to 37 in each of the water washing tanks are integrally provided on each removable transport rack.

An end portion of a pipe 45 for replenishing the fourth washing tank 26 with the fresh washing liquid stored in the replenishing tank 44 is arranged above the fourth washing tank 26. The pipe 45 is provided with a pump 46 for replenishing the fourth washing tank 26 with the washing liquid in the replenishing tank 44. A drive device (not shown) is connected to the pump 46 so that the pump 46 operates at a predetermined timing. The replenished rinsing liquid flows down into the third rinsing tank 25, and then sequentially into the second and first rinsing tanks. The first washing tank 23 is provided with an overflow pipe 47 for discharging a predetermined amount or more of washing liquid. The overflow washing liquid is used for overflow pipe 4
It is stored in the storage tank 48 via 7.

As shown in FIG. 3, the submerged squeeze portion 42
Is a main body 52 attached to the opening 51 of the partition wall 39,
The blade 53 is a partition member, and the blade retainer 54 is a holding member. The main body 52 is a partition wall 39.
It is attached with a screw 55 and is detachable. A packing 56 is sandwiched between the main body 52 and the partition wall 39.

As shown in FIG. 4, the main body 52 is formed in a rectangular plate shape, and a slit (opening) 57 that is long in the horizontal direction is formed in the central portion. This slit 57 is
It is composed of an upper edge 57a, a lower edge 57b, and a side edge 57c. The photosensitive material 10a of this slit 57
The portion on the upstream side in the conveyance direction (on the side of the conveyance roller pair 36) is obliquely cut. The inclined surface, which is continuous with the upper edge portion 57a, of this obliquely cut portion is a blade attachment surface 58. The inclined surface continuous with the lower edge portion 57b serves as a guide surface (second guide surface) 59 for guiding the tip of the photosensitive material.

A screw hole 60 is formed in the blade mounting surface 58.
Are formed. Further, the blade 53 is formed with a mounting hole 61 that is a long hole that is long in the horizontal direction.
A screw insertion hole 62 is formed in the blade retainer 54. By inserting the screw 63 into the screw insertion hole 62 and attaching the screw 63 to the screw hole 60, the blade 53 is attached to the blade attachment surface 58 via the blade retainer 54.

The blade 53 is made of a thin plate made of synthetic resin such as thermosetting polyurethane resin and elastically deforms. With the blade 53 attached to the main body 52, the tip portion 53 a of the blade 53 has a lower edge portion 5 of the slit 57.
7b elastically contacts. As a result, the slit 57 is sealed by the blade 53, and the washing liquid in the washing tank partitioned by the partition wall 39 does not flow to each other. When the photosensitive material 10a passes, the photosensitive material 10a
The blade tip 53a is pushed by the tip of the blade. As a result, the photosensitive material 10a can pass through the slits 57, and the blade 53 prevents the washing liquid from passing therethrough.

The blade retainer 54 is formed in a wedge shape that becomes thinner toward the tip. This blade holder 5
4 is a guide surface 54 for guiding the tip of the photosensitive material 10a with the blade 53 attached to the main body 52.
a (first guide surface). This first guide surface 5
4a and the 2nd guide surface 59 are formed so that a space | interval may become large gradually toward the conveyance roller pair 36.

As shown in FIG. 5, the conveyance guide member 71
Is composed of an upper guide plate 72 and a lower guide plate 73. The upper guide plate 72 has an upper guide surface (the third guide plate).
Guide surface) 72a is formed, and the lower guide plate 73 is formed.
A lower guide surface (fourth guide surface) 73a is formed at the bottom. The third guide surface 72a and the fourth guide surface 73a
Are formed such that the interval gradually increases toward the contact position P1 between the lower edge portion 57b and the blade tip portion 53a.

The pair of conveying rollers 36 and 37 and the photosensitive material 10a
The contact position P1 between the lower edge portion 57b and the blade tip end portion 53a is a position slightly protruding toward the blade 53 side with respect to the photosensitive material conveyance path 74 connecting the respective contact points P2 and P3. Further, the central axis of the conveyance roller pair 36 and the conveyance roller pair 3
The distance L1 from the center axis of the photosensitive member 7 is set to be equal to or less than the minimum length of the photosensitive material of various sizes in the conveyance direction.
The contact position P1 between the lower edge portion 57b and the blade tip end portion 53a may be located at the same level as the photosensitive material conveyance path 74.

As shown in FIG. 6, the front end 54b of the first guide surface 54a passes through the contact point P2 between the pair of conveying rollers 36 and the photosensitive material 10a and is perpendicular to the photosensitive material conveying path 74. It has a center C1 on the 54a side and is located within a circle 83 having a radius R1 = 100 mm with the photosensitive material conveyance path 74 as a tangent line. Further, the tip 59a of the second guide surface 59 has a center C2 on the side of the second guide surface 59 of the perpendicular line 81, and the radius R2 = 3 with the photosensitive material conveyance path 74 as a tangent line.
It is located within a 0 mm circle 84.

The tip 72b of the third guide surface 72a passes through the contact position P1 between the lower edge portion 57b and the blade tip portion 53a and is centered C3 on the side of the third guide surface 72a of the perpendicular line 82 orthogonal to the photosensitive material conveying path 74. With a photosensitive material conveyance path 7
It is located within a circle 85 having a radius R3 of 100 mm and having a tangent line of 4. Further, the tip 73b of the fourth guide surface 73a is
It has a center C4 on the side of the fourth guide surface 73a of the perpendicular line 82, and is located within a circle 86 having a radius R4 = 30 mm with the photosensitive material conveying path 74 as a tangent line.

Next, the operation of the above embodiment will be described. The photosensitive material 10a exposed by the printer unit 3 of the printer processor 2 is sequentially immersed in the developing solution in the developing tank 21 and the bleach-fixing solution in the bleach-fixing tank 22 by the transport rack 28, and then the first squeeze section 38 is used to immerse the photosensitive material 10a. It is transported to the washing tank 23.
The photosensitive material 10 a transported to the first washing tank 23 is washed with the washing liquid in the first washing tank 23.

Photosensitive material 10 washed in the first washing tank 23
a is carried into the submerged squeeze portion 42 by the conveying roller pair 36 via the first guide surface 54a and the second guide surface 59, and the tip portion 53 of the blade 53 of the submerged squeeze portion 42 is conveyed.
a by deforming the blade 53 and the lower edge 5 of the slit 57.
7b while sliding between
The first third guide surface 72a and the fourth guide surface 73a guide the transport roller pair 37, and the transport roller pair 37 transports the second wash tank 24. After the photosensitive material 10a has passed, the blade tip portion 53a again comes into close contact with the lower edge portion 57a of the slit 57 to prevent passage of the washing liquid.

Thereafter, the photosensitive material 10a passes through each submerged squeeze portion 42 and is submerged in the washing tank 27, and is conveyed to the drying device 12 by the pair of conveying rollers 34. The dried photosensitive material 10a is sorted by the sorter unit 13 for each order.

As described above, the photosensitive material 10a includes the conveying roller pair 36, the first guide surface 54a and the second guide surface 5.
The third guide surface 72 a and the fourth guide surface 73 of the conveyance guide member 71 are carried into the submerged squeeze portion 42 via
It is carried out of the submerged squeeze section 42 via a and the conveyance roller pair 37, and sequentially conveyed in the washing tank 27 in the liquid. At this time, the contact position P1 between the lower edge portion 57b and the blade tip portion 53a is lower than the lower edge portion 57 with respect to the photosensitive material conveyance path 74.
At the position retracted to the side b, the photosensitive material 10a passes through while being rolled up at a position higher than the blade tip portion 53a, so that a gap is created between the photosensitive material 10a and the lower edge portion 57b. Then, the rinsing liquid flows out from this gap to reduce the rinsing ability. However, in the present invention, the lower edge 5
A contact position P1 between the blade 7b and the blade tip portion 53a is located at a position slightly protruding toward the blade 53 side with respect to the photosensitive material conveying path 74. Therefore, since the photosensitive material 10a always pushes the blade tip portion 53a away and passes therethrough, there is no gap between the photosensitive material 10a and the lower edge portion 57b, and the passage of the washing liquid in the submerged squeeze portion is minimized. It is suppressed, and the washing ability of the washing tank can be maintained.

The first to fourth guide surfaces 54a, 59, 72
If the relative positional relationship among the a, 73a, the transport roller pairs 36, 37, and the submerged squeeze portion 42 is not defined,
Due to improper conveyance, the photosensitive material 10a does not pass through the regular conveying path 14, and its edge portion comes into contact with the guide surface and suffers damage, resulting in deterioration of quality and jamming of the photosensitive material 10a. On the other hand, in the present invention,
Since the relative positional relationship among the fourth guide surfaces 54a, 59, 72a, 73a, the conveying roller pairs 36, 37, and the submerged squeeze portion 42 is defined in detail, the photosensitive material 10a is reliably conveyed and is reliable. The development processing can be performed with good properties.

In the above embodiment, the relative positional relationship among the first to fourth guide surfaces, the conveying roller pair 36, and the submerged squeeze portion 42 is defined. However, the present invention is not limited to this, and all relative positions are defined. It can be applied by being applied to a transport system.
Further, the above-mentioned positional relationship regulation is satisfied within the dimensional error range of each component.

In the above embodiment, the pair of conveying rollers 36, 37.
Is provided integrally with a transport rack that can be detached from the washing tank main body, separately from the submerged squeeze portion 42. You may apply. Also, the first guide surface 5
Although the 4a and the second guide surface 59 are formed integrally with the main body 52 of the submerged squeeze portion 42 and the blade retainer 54, a conveyance guide member may be provided separately from this.

Further, in the above embodiment, the blade 53 is arranged on the upper side of the main body 52, and the photosensitive material 10a is conveyed while passing between the blade tip portion 53a and the lower edge portion 57b. Even when the blade 53 is arranged on the lower side of the main body 52 and the photosensitive material 10a is conveyed while passing between the blade tip portion 53a and the upper edge portion 57a of the slit 57, the photosensitive material conveyance path 74 is The present invention is effective, as long as the contact position between the upper edge portion 57a and the blade tip portion 53a is at the same level position or a position slightly protruding toward the blade 53 side.

[0033]

As described above, according to the photosensitive material developing and processing apparatus of the present invention, the relative positional relationship among the submerged squeeze portion, the conveying member and the conveying guide member is defined in detail, and therefore the photosensitive material is defined. It is possible to reliably transport the liquid and to suppress the passage of the processing liquid to the minimum.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an internal configuration of a printer processor in which a photosensitive material development processing apparatus of the present invention is implemented.

FIG. 2 is a schematic view of a photosensitive material development processing apparatus.

FIG. 3 is an enlarged cross-sectional view of a submerged squeeze portion.

FIG. 4 is an exploded perspective view of a submerged squeeze portion.

FIG. 5 is an enlarged cross-sectional view showing a positional relationship between a submerged squeeze portion and a photosensitive material conveyance path.

FIG. 6 is an enlarged cross-sectional view showing a positional relationship among a submerged squeeze portion, a conveyance roller pair, and a conveyance guide member.

[Explanation of symbols]

2 Printer processor 10 Photosensitive material 11 Photosensitive material development processing device 21 developer tank 22 Bleach-fixing tank 27 Washing tank 28 Transport rack 29-35 Conveyor roller pair 36 Conveying roller pair (first conveying member) 37 conveying roller pair (second conveying member) 38 Liquid Squeeze Part 39 to 41 partition wall 42 Squeeze part in liquid 52 body 53 Blade (partitioning member) 54 Blade holder (holding member) 54a First guide surface 57 slits 59 Second guide surface 71 Transport guide member 72a Third guide surface 73a Fourth guide surface 74 Photosensitive Material Transport Route 81, 82 perpendicular 83,85 Circle with radius 100mm 84,86 circle with radius 30mm

Claims (3)

[Claims] 1. A main body having an opening, which is provided on a partition wall between a plurality of processing tanks for storing a processing liquid, and a partition member disposed in the opening, and a tip of the partition member at an edge portion of the opening. A submerged squeeze portion that allows the photosensitive material to pass therethrough and prevents the processing liquid from passing therethrough; and a first conveying member that conveys the photosensitive material to the submerged squeeze portion. In a photosensitive material development processing apparatus including a second conveying member that conveys a photosensitive material from a submerged squeeze portion, a contact position between an edge portion of the opening and a tip portion of the partition member is
A photosensitive material development processing apparatus, which is at the same level position or a position slightly protruding toward the partition member side with respect to the photosensitive material conveying path connecting the first conveying member and the second conveying member. 2. The main body includes a holding member that holds the partition member, and a first guide that guides the leading end of the photosensitive material to the contact position at a position of the holding member facing the photosensitive material conveying path. A surface is formed, and a second guide surface that guides the tip of the photosensitive material to the contact position is formed at a position of the edge portion facing the photosensitive material conveyance path, and the first guide surface and the second guide surface are formed. Are formed so that the distance between them gradually increases toward the first transport member, and the first guide surface side that passes through the contact point between the first transport member and the photosensitive material and is orthogonal to the photosensitive material transport path is formed. A radius 100 having a center on a perpendicular line and having a tangent line to the photosensitive material conveyance path.
The tip of the first guide surface is installed within a circle of mm, and the center is on a perpendicular line on the second guide surface side that passes through the contact point between the first conveying member and the photosensitive material and is orthogonal to the photosensitive material conveying path. A radius of 30 m with the photosensitive material conveying path as a tangent line
2. The photosensitive material development processing apparatus according to claim 1, wherein the tip of the second guide surface is provided within a circle of m. 3. A conveyance guide member is provided between the contact position and the second conveyance member, and the conveyance guide member is provided with the photosensitive material on the partition member side with respect to the photosensitive material conveyance path. A third guide surface that guides the photosensitive material to the second transport member, and a fourth guide surface that guides the photosensitive material to the second transport member on the edge side with respect to the photosensitive material transport path. The guide surface and the fourth guide surface are formed so that the distance between them gradually increases toward the submerged squeeze portion, and the third guide surface on the side of the third guide surface that passes through the contact position and is orthogonal to the photosensitive material conveyance path is formed. A fourth guide having a center on a perpendicular line and having a tip of the third guide surface installed in a circle having a radius of 100 mm with the photosensitive material transport path as a tangent line, passing through the contact position, and orthogonal to the photosensitive material transport path. Hold the center on the perpendicular of the surface side, Photosensitive material developing apparatus according to claim 1 or 2, characterized in that the photosensitive material conveyance path established a distal end of the fourth guide surface within a circle of a radius 30mm to a tangent.