JPH0826454A - Board conveying wheel - Google Patents

Abstract

PURPOSE:To provide a board conveying wheel capable of being inserted onto a shaft extremely simply, conveying the board smoothly with small degradation and dimensional change and long life and being manufactured with low cost regardless of a system of supporting the board by a rubber portion. CONSTITUTION:Left and right resin made block pieces 1, 1 are structured to have a cylindrical bearing part 12 bulged to the rear surface side at a right angle to the central part of a disk part 11 and a plurality of welding lugs 13 erected at a predetermined interval near the peripheral edge of the front side surface of the disk part 11. A ring-like rubber body 2 has the diameter larger than that of the disk part 11, the central hole through which a shaft is inserted and lug inserting holes in which the lugs are respectively inserted. A ring-like rubber sheet 2 is sandwiched between the disk parts 11, 11 of the left and right block pieces 1, 1 to unite the block pieces 1, 1 with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel for use in a conveyor device for horizontally transporting a substrate typified by a rigid or flexible printed wiring board for various treatments.

[0002]

2. Description of the Related Art In the process of manufacturing a printed wiring board, after a dry film (resist) is laminated on the substrate, the substrate is conveyed in the horizontal direction while being exposed, developed, etched, resist stripped, etc. Process. There is also a method in which a resist is directly coated and formed on the substrate instead of the dry film.

In the transfer of substrates in each of the above steps, typically, shafts having wheels mounted at predetermined intervals are arranged in parallel at regular intervals such that their axes are perpendicular to the transfer direction (up and down). Often arranged in parallel in two stages),
This is carried out by rotating the wheel by drivingly rotating the shaft and running the substrate located on the wheel or between the two upper and lower wheels. The wheels are arranged in a longitudinally and laterally aligned state in a plan view or in a zigzag aligned state in a plan view, depending on whether the substrate is rigid or flexible.

Japanese Unexamined Patent Publication No. 62-79146 discloses a first method.
In a conveyor device in which first shafts to which wheels are attached are arranged in parallel at regular intervals, it is disclosed that a second shaft to which a second wheel having a small diameter is attached is installed between adjacent first shafts. Shows a mode in which the first wheels are arranged in a zigzag manner in a plan view between the adjacent first shafts. However, in this publication,
There is no particular description of the wheel structure.

FIG. 2 of Japanese Patent Laid-Open No. 4-280748 also shows a conveying device in which shafts to which wheels are attached are arranged so that the wheels are staggered in plan view between adjacent shafts. However, the publication does not specifically describe the structure of the wheel.

Japanese Utility Model Publication No. 2-41633 (Japanese Utility Model Publication No. 61)
(JP-A-41257) also discloses a substrate transfer device in which shafts to which wheels are attached are arranged so that the transfer wheels have a zigzag shape in plan view between adjacent shafts. This publication discloses an example in which an O-ring is fitted on the peripheral surface of a wheel body having a uniform diameter and a thin wall as a transport wheel.

Japanese Utility Model Publication No. 5-30045 (Japanese Utility Model Publication Sho 63)
-76756) discloses a mode of using a wheel in which a urethane rubber coating film is formed on the outer peripheral surface of a wheel body in a drive roller for conveying a long strip-shaped thin plate.

As a substrate transporting wheel which is actually used at present, "a wheel in which an O-ring is fitted on the peripheral surface of the main body" as disclosed in the above-mentioned Japanese Utility Model Publication No. 2-41633 is used. In addition to the "wheel in which a rubber film is externally fitted on the outer peripheral surface of the main body" as disclosed in Japanese Patent No. 30045, "a wheel-shaped rubber wheel entirely made of a rubber molded body",
"Wheel-shaped plastic wheels made entirely of plastics such as polypropylene" are examples.

[0009]

[Problems to be Solved by the Invention] As described above,
In the manufacturing process of a printed wiring board, each processing such as a development processing, an etching processing, a resist stripping processing is performed while a board positioned on a wheel or between two upper and lower wheels is run. Here, the developer is alkaline water,
An aqueous solution of cupric chloride or ferric chloride is used as the etching liquid, and alkaline water or the like is used as the stripping treatment liquid, and each chemical liquid is showered toward the substrate.

Originally, the chemical solution is likely to damage rubber, and the chemical solution in each step is, for example, 40 to 45 ° C. (developing step), around 40 ° C. (etching step), 50 to 55 ° C.
Since it is heated as in the (resist stripping step), the rubber portion of the wheel is susceptible to swelling and deterioration due to contact with the chemical liquid. In particular, when stress is applied to the rubber portion, the deterioration rate of the rubber becomes faster.

Among the conventional substrate transfer wheels, the wheel in which the O-ring is fitted to the peripheral surface of the main body has the O-ring fitted to the wheel body in a state in which tensile force is applied (otherwise, the O-ring is It spins idle, and cracks occur in a short period of time due to contact with a chemical solution, and further, cutting is likely to occur. Further, it is not easy to fit the O-ring on the peripheral surface of the wheel body.

A wheel having a rubber film fitted on the outer peripheral surface of the main body also has a rubber film installed on the peripheral surface of the wheel main body under tension (otherwise, the rubber film will spin idle). When contacted with, cracks are generated in a short period of time, and further cutting is likely to occur. Further, the work of fitting the rubber film on the peripheral surface of the wheel body is not easy.

In the case of a wheel-shaped rubber wheel made entirely of a rubber molding, the diameter of the bearing portion of the wheel is made smaller than the outer diameter of the shaft in order to prevent idling (for example, a wheel having an inner diameter of the bearing portion of 6 mm). The outer diameter is inserted into a shaft having an outer diameter of 8 mm), and the operation of inserting the wheel into the shaft is very complicated. Even if a fluorine-based rubber with chemical resistance is used as the rubber, the whole is in contact with the chemical solution, so that the swelling is remarkable, so the diameter of the wheels changes greatly, and a considerable number of the aligned wheels are the substrate. It may spin around without supporting it, and as a result, the substrate may meander.

As described above, the conventional wheel using rubber has a remarkable deterioration and a dimensional change and has a short life, but in a conveying line in which several thousand and tens of thousands of wheels are arranged,
The disadvantage is unbearable because the line must be stopped to replace a defective wheel with a new one.

Since a wheel made of plastics, which is entirely made of plastics such as polypropylene, originally has a low frictional force, the substrate easily slips, and since it does not have elasticity, the surface of the substrate may be damaged.

Under such a background, the present invention relates to the method of supporting the substrate with the rubber portion, but the work of inserting the shaft is extremely simple, deterioration and dimensional change are small, and the length is long. It is an object of the present invention to provide a substrate carrying wheel that can carry a substrate smoothly over its life and can be manufactured at low cost.

[0017]

In the wheel for transferring substrates of the present invention, a cylindrical bearing portion (12) projects from the center of the disc portion (11) to the rear side in the direction perpendicular to the disc portion (11). Left and right resin block pieces (1), (1) having a structure in which a plurality of ridges (13) are erected at a predetermined interval near the periphery of the front surface of the
And a ridge insertion hole (2) having a diameter larger than that of the disc portion (11) and having a central hole (21) through which the shaft is inserted and the ridge (13).
2) and a ring-shaped rubber body (2).

Such left and right block pieces (1), (1) are
The disc parts (11), (11) are made to face each other and the ring-shaped rubber body (2) is sandwiched between the disc parts (11), (11) to be integrated. .

The present invention will be described in detail below.

The substrate transfer wheel of the present invention comprises left and right block pieces (1), (1) and a ring-shaped rubber body (2).

The block pieces (1), (1) are molded by injection-molding a chemically resistant resin such as polypropylene or polyethylene.

Each block piece (1), (1) is a disk part
Cylindrical bearing part (12) from the center of (11) to the rear side at right angles
Has a structure in which a plurality of ridges (13) are erected at a predetermined interval near the periphery of the front surface of the disc portion (11).

The free end side of the bearing portion (12) is formed in a stepped structure or a notched structure so that the bearing portions (12), (12) of adjacent wheels can be engaged with each other when inserted into the shaft. It is formed at the junction (16).

The base end side of the bearing portion (12) is preferably formed in the shape of a flange (15) slightly protruding from the front surface of the disc portion (11).

A plurality of ridges (13) provided upright at a predetermined interval near the peripheral edge of the front surface of the disc portion (11) of the block piece (1).
It is particularly desirable to form a concave or through hole-shaped receiving portion (14) for receiving the tip end side of the protrusion (13) of the opponent block piece (1) at the intermediate position.

Examples of the material of the ring-shaped rubber body (2) include rubbers and elastomers such as fluorine rubber and ethylene-propylene rubber.

The ring-shaped rubber body (2) has a diameter larger than that of the disc portion (11). The portion protruding from the disc portion (11) supports the substrate.

The ring-shaped rubber body (2) has a central hole (21) through which the shaft (and the above-mentioned flange (15)) is inserted and a ridge insertion hole (22) through which the ridge (13) is inserted. Have.

This ring-shaped rubber body (2) can be obtained by compression molding a rubber material. In that case, the wall thicknesses on both sides of the outer peripheral portion are the disk portions of the block piece (1).
It is desirable to form it as thick as the thickness of (11). In addition to the method of molding the ring-shaped rubber body (2) by the compression molding method, the ring-shaped rubber body is punched out from the rubber sheet.
The method of producing (2) can also be adopted.

When assembling the substrate transfer wheel,
Replace the left and right block pieces (1), (1) with the respective disc parts (11),
The ring-shaped rubber bodies (2) may be integrated in such a manner that the ring-shaped rubber bodies (2) are sandwiched between the disk portions (11) and (11) so that they are opposed to each other. The left and right block pieces (1), (1) are integrated by fusion or fitting.

When the fusion bonding method is adopted, the ring-shaped rubber body (2) is sandwiched between the left and right block pieces (1), (1), and each block piece (1), The tip of the ridge (13) of (1) is the opposite block piece (1), the disk part (11) of (1)
It may be fused near the peripheral edge of the surface on the front side. Block piece
When a concave or through hole-shaped receiving part (14) is provided on the front surface of the disc part (11) of (1), one of the left and right ridges (13) of the block piece (1) is The tip of the block piece (1) is fused with the receiving portion (14) of the other block piece (1).
In addition to the fusion of the above points, each block piece (1), (1)
The flanges (15) and (15) of the above are also fused together. The receiving part (1
The installation of 4) is advantageous in terms of ensuring fusion and center alignment.

Although the fusion method is not limited, the fusion is preferably performed by an ultrasonic fusion method. This is because the fusion by the ultrasonic fusion method can be automated and the fusion can be surely integrated.

When the fitting method is adopted, the ring-shaped rubber bodies (2) are sandwiched between the left and right block pieces (1), (1), and the block pieces (1), ( The tip side of the ridge (13) of (1), the concave or through hole-shaped receiving portion (14) of the front surface of the disk portion (11) of the other block piece (1), (1)
It should be fitted tightly.

[0034]

The substrate transfer wheel of the present invention having the above structure is extremely easy to insert into the shaft. Engagement part (16) on the free end side of bearing parts (12), (12) of adjacent wheels
Inserting the wheels into the shaft one after another while making them engage with each other, and fixing the wheels with the detents provided at both ends of the shaft, all the wheels inserted into the shaft can be rotated by the drive rotation of the shaft. it can.

Such wheel insertion shafts are arranged in parallel at regular intervals so that their axes are at right angles to the conveying direction (often arranged in parallel in two steps), and the position of the wheels in plan view. In the vertical and horizontal directions or in the staggered arrangement, the substrate is smoothly transported in the horizontal direction by the rotation of the wheel driven by the rotation of the shaft.
Each processing such as development processing, etching processing, and resist stripping processing can be smoothly performed. Examples of the substrate to be transported include a printed wiring board, a liquid crystal display substrate, a color filter substrate, and various rigid or flexible substrates.

In the substrate transfer wheel of the present invention, the ring-shaped rubber body (2) is sandwiched between the disk parts (11) and (11) of the left and right block pieces (1) and (1). Since no stress is applied in the tensile direction to the ring-shaped rubber body (2), the disk-shaped parts (11), (11) of the ring-shaped rubber body (2) are
Since the chemical solution does not easily penetrate into the area sandwiched by the, the area where the ring-shaped rubber body (2) comes into contact with the chemical solution is minimized. Therefore, the disc part (11) of the ring-shaped rubber body (2),
Even if the chemical solution comes into contact with the part protruding from (11), the progress of deterioration is small and the dimensional change due to swelling is small, and as a result, the life of the wheel becomes significantly longer than that of the conventional wheel using rubber. The long life of the wheels means that the frequency of stopping the transfer line for wheel replacement is reduced, which is a great advantage.

[0037]

EXAMPLES The present invention will be further described with reference to examples.

Example 1 FIG. 1 is a side view showing an example of a substrate carrying wheel of the present invention. FIG. 2 is a block piece constituting the wheel of FIG.
(1) is a front view, FIG. 3 is a rear view of the block piece (1) of FIG. 2,
4 is a side view of the block piece (1) of FIG. 2, and FIG. 5 is a sectional view of the block piece (1) of FIG. FIG. 6 is a front view of the ring-shaped rubber body (2) constituting the wheel of FIG. 1, and FIG. 7 is a sectional view of the ring-shaped rubber body (2) of FIG.

The block piece (1) shown in FIGS. 2 to 5 was molded by injection molding polypropylene. This block piece (1) has an outer diameter of 10.5 mm, an inner diameter of 8.5 mm, and a length of 2 from the center of the disc part (11) with a diameter of 40 mm to the rear side in the perpendicular direction.
It has a basic structure in which a 0 mm cylindrical bearing portion (12) overhangs.

Near the periphery of the front surface of the disk portion (11) of the block piece (1), four column-shaped protrusions (13) having a diameter of 2 mm and a height of 3 mm are erected at equal intervals. Has been done. Also, the inner diameter is about 2
Four concave receiving parts (14) of mm are installed at equal intervals so as to have an alternate positional relationship with the above-mentioned ridges (13).

The base end side of the bearing portion (12) is a flange (1 mm with a diameter of 20 mm slightly protruding from the front surface of the disc portion (11).
It is formed in the shape of 5). The inner peripheral edge of the flange (15) is formed in a taper shape so as not to bulge on the hollow portion side of the bearing portion (12) at the time of fusion bonding so as to prevent insertion of the shaft.

The free end side of the bearing portion (12) is a notch-shaped engaging portion so that the free end side of the bearing portion (12) of an adjacent wheel can be engaged with the free end side of the wheel when the wheel is inserted through the shaft. It is formed in (16).

Two types of ring-shaped rubber bodies (2) having a diameter of 50 mm and having the shapes shown in FIGS. 6 to 7 were molded by compression molding using a fluorine rubber and an ethylene-propylene rubber. At the center of the ring-shaped rubber body (2), a central hole (2
1) is formed, and eight ridge insertion holes (22) with a diameter of about 2 mm through which the above-mentioned four ridges (13) are inserted are formed. The outer peripheral portion of the ring-shaped rubber body (2) has a thickness of 5 mm, and the other portions have a thickness of 2.3 mm.

Left and right block pieces (1), disk portions (11) of (1),
With the ring-shaped rubber body (2) interposed between (11), the ridges (13) of each block piece (1), (1)
The tip end side of the was fitted to the concave receiving parts (14) of the opposing block pieces (1) and (1) and was fused by ultrasonic welding. As a result, the tip end side of the ridge (13) of one of the left and right block pieces (1) is fused and fitted in the concave receiving portion (14) of the other block piece (1). The flanges (15) and (15) of the block pieces (1) and (1) were also fused and integrated.

The thus manufactured wheel is provided with the engaging portion (1) on the free end side of the bearing portions (12), (12) of the adjacent wheels.
6) The shafts were inserted one after another so that they would engage each other, and the wheels on both ends were fixed by engaging the detents attached to the shafts. Then, the wheel insertion shafts were arranged in parallel in the upper and lower two stages at regular intervals so that the axis of the wheel insertion shaft was at right angles to the conveying direction to form a horizontal conveyer for substrate conveyance. The positional relationship of the wheels was arranged in a staggered arrangement in plan view.

Using this conveyor, a series of treatments such as lamination of a dry film on a flexible substrate, exposure treatment, development treatment, etching treatment and resist stripping treatment were performed. In the development process and the resist stripping process, a wheel made of fluororubber ring rubber (2) is used. In the etching process, a ring rubber body made of ethylene-propylene rubber is used.
The wheel using (2) was used.

This wheel was small in swelling even when it came into contact with a chemical solution and did not crack, so that the substrate could be smoothly transported for a long period of time. The life of this wheel is
It was much longer than when using a conventional wheel made of rubber.

Embodiment 2 FIG. 8 is a sectional view showing another example of the block piece (1) constituting the substrate carrying wheel of the present invention.

In this embodiment, the free end side of the ridge (13) provided near the peripheral edge of the front surface of the disk portion (11) of the block piece (1) is bulged, and Through-hole-shaped receiving portions (14) are installed so as to have an alternate positional relationship with the ridges (13).

The integration of the left and right block pieces (1), (1) in a state where the ring-shaped rubber body (2) is interposed in a sandwich shape is performed by the protrusions (13) of the block pieces (1), (1). ) Is pushed into the receiving portions (14) of the opposing block pieces (1), (1).

[0051]

The substrate transfer wheel of the present invention is extremely easy to insert into the shaft, and has little deterioration or dimensional change regardless of the method using rubber.
Since it has a long service life, it has excellent effects such as that the frequency of replacement is low, that the substrate can be transported smoothly, and that it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a substrate carrying wheel of the present invention.

2 is a front view of a block piece (1) constituting the wheel of FIG. 1. FIG.

FIG. 3 is a rear view of the block piece (1) of FIG.

FIG. 4 is a side view of the block piece (1) of FIG.

5 is a cross-sectional view of the block piece (1) of FIG.

FIG. 6 is a ring-shaped rubber body (2) forming the wheel of FIG.
FIG.

7 is a cross-sectional view of the ring-shaped rubber body (2) of FIG.

FIG. 8 is a cross-sectional view showing another example of the block piece (1) which constitutes the substrate carrying wheel of the present invention.

[Explanation of symbols]

(1) ... Block piece, (11) ... Disc part, (12) ... Bearing part, (1
3) ... ridge, (14) ... receiving part, (15) ... flange, (16) ... engaging part, (2) ... ring-shaped rubber body, (21) ... central hole, (22) ... ridge insertion Hole

Claims (6)

[Claims] 1. A cylindrical bearing portion (12) projects from the center of the disc portion (11) to the rear side in the direction perpendicular to the disc portion (11), and a plurality of protrusions are provided near the periphery of the front side surface of the disc portion (11). Left and right resin block pieces (1) having a structure in which the strips (13) are erected at predetermined intervals,
(1) and a ring having a diameter larger than that of the disc portion (11) and having a central hole (21) through which the shaft is inserted and a ridge insertion hole (22) through which the ridge (13) is inserted. A substrate transfer wheel consisting of a rubber body (2). 2. A plurality of ridges (13) which are erected at predetermined intervals near the peripheral edge of the front surface of the disk portion (11) of the block piece (1).
The substrate transfer wheel according to claim 1, wherein a concave or through hole-shaped receiving portion (14) for receiving the tip end side of the protrusion (13) of the opponent block piece (1) is formed at the intermediate position of the above. 3. The substrate transfer apparatus according to claim 1, wherein the base end side of the bearing portion (12) is formed in the shape of a flange (15) slightly protruding from the front surface of the disc portion (11). wheel. 4. The free end side of the bearing portion (12) is formed as an engaging portion (16) engageable with the free end side of the bearing portions (12) of adjacent wheels when the wheel is inserted through the shaft. The substrate transfer wheel according to claim 1. 5. The left and right block pieces (1), (1) are made to face each other with their disc parts (11), (11) facing each other, and the disc parts (1
The substrate transfer wheel according to claim 1, wherein the ring-shaped rubber body (2) is integrated between 1) and (11) in a sandwiched state. 6. The substrate transfer wheel according to claim 5, wherein the left and right block pieces (1), (1) are integrated by fusion or fitting.