JP4190413B2 - Equipment for the transport of very thin and flat workpieces and wet chemical or electrolytic treatment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention comprises at least two flat and emergency arranged side by side, comprising at least two brackets (arms) connected by at least one guide and a stacking rack with vertical support elements. It relates to a device for conveying and wet chemical and / or electrolytic treatment of a thin object to be processed on SL workpiece which has been placed in one of the bundle of the.
[0002]
[Prior art]
Processed objects such as printed wiring boards and especially printed wiring foils (foil) in wet chemical vertical electroplating equipment or vertical transport equipment to be processed in one bundle for chemical or electrolytic treatment If so, when they can be processed, they are transported in baskets to transport and process a greater number of printed boards simultaneously. In these baskets, usually printed wiring boards are stacked one after the other, and the intervals are maintained. Depending on the size of the device, for example, 10 to 50 printed boards can be stacked one after the other with an interval of 10 to 30 mm. If electrolytic treatment is required, the spacing is 100-300 mm, depending on the required anode-cathode spacing. In this case, one anode is arranged between two printed boards in each plating bath. In larger devices, multiple baskets can be placed side by side. The spacing between the printed boards is necessary for the processing fluid to wet the printed boards evenly and provide good fluid exchange. The holding element corresponds to a normal comb or U-shaped guide protrusion, and a printed wiring board is loosely inserted therein and kept at a predetermined interval. This type of basket is known from US Pat.
[Patent Document 1]
US Patent Specification 4,385,781

[0003]
As the electrical structure of a printed wiring board is miniaturized, it is necessary to reduce the thickness of the printed board. In a special application example, it is required to configure a printed wiring board flexibly. A very thin and elastic printed wiring board is also called a printed wiring foil. Printed wiring foils are often housed in cases with complex shapes. The printed wiring foil must be adaptable to its shape so that it does not take up installation space. This type of printed wiring foil can no longer reliably hold in conventional transport baskets due to wet chemical processes such as metallization or cleaning. They deform and come off the guide. Also, they cannot withstand the fluid pressure generated by the movement of the workpiece due to the fluid pressure of the nozzle directed to the printed wiring foil or through the holes.
[0004]
Furthermore, at today's technical level, it is known to fasten a printed wiring board in at least three directions with a fastening screw or the like. This approach is also not suitable for fragile printed wiring foils. For example, due to the difference in temperature in each plating bath, the expansion of a printed wiring foil having a plastic core is significantly different from that of a metal holder. The printed wiring foil is distorted and therefore debris. Furthermore, fluid pressure generated during processing results in dimensional changes that are unacceptable for the sandwiched printed wiring foil.
[0005]
[Problems to be solved by the invention]
The problem underlying the present invention is to propose a device that can safely carry a printed wiring foil and at the same time not damage the fragile workpieces, for example, by shrinkage or longitudinal stretching. .
[0006]
[Means for Solving the Problems]
This problem is solved according to the invention by the subject matter according to claims 1 and 2. Further embodiments of the invention are described in the dependent claims.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The solution proposal is described in detail below with an example of a stacking rack according to the present invention.
[0008]
In order to make the embodiments easier to understand, unusual and special names have been used for the structural elements. In this case, the same numbers indicate matching elements or elements that act equally.
[0009]
The detachable fixture 3 in the support block (support spacing member) 2 is referred to as a fixing screw, for example. However, other fixing means can also be used, such as, for example, elastic clasps, bend (toggle) levers, eccentrics and the like. The same applies to the suspension elements 10, 12 referred to in the embodiments as tension rollers. This element may be a hook, a roller with a flange, or a notch, or a separate member each overhanging from the support element, to which the tension element 13 is suspended to prevent sliding off. As described above, the tension element 13 may be a tension belt made of an elastic plastic material, or a rubber O-shaped ring, a seamless tension spring, a tension spring with hook retaining rings at both ends, or a spring force at each end. Another elastic elongate element having the possibility of fastening may be used. Further, the suspension element 5 for the printed wiring board is hereinafter referred to as a support rail. Again, other elongated suspension elements can be used, which are not rail-like, for example have a circular or rectangular cross-section, or are tubular and are referred to in the following process (in the following) as suspension pins. The hanger 6 can be firmly fixed. The hanger can be made up as a flanged pin or as a hook that prevents the work piece from slipping down, or other similar.
[0010]
FIG. 1 shows a panoramic view from the front of a device formed as a stacking rack according to the invention, and FIG. 7 shows a three-dimensional foreground viewed from an oblique front of a very similar stacking rack. Has been. In FIG. 1, the conveying direction in the corresponding processing equipment is straight in the direction of going into the drawing. The above-described stackable rack is, for example, a vertical electroplating apparatus that lifts an object to be processed from one plating bath and moves to the next processing stage (station), or in a state where the stackable rack is hung on a single chain. It can be used in moving vertical transport equipment. In the latter case, the stacking rack is preferably rotated 90 degrees during transport through the facility. Actually, the object 7 to be processed, which is often rectangular, that is, a printed wiring board or a printed wiring foil, has fixing holes 19 at all four corners.
[0011]
By means of transport not shown, the stacking racks are carried up, down and moved into the individual processing stations. At that time, the conveying means holds the stacking rack with its supporting arm (bracket) 1. A guide (guide portion) 4 extending so as to cross between the support arms in the stacking rack is fixed to the horizontal beam 20. The side beam 20 extends into the drawing plane and is firmly fixed to the support arm 1. A support block 2 movably supported is attached to the guide 4. The support block is stopped at the position of the fixing hole 19 after accurate adjustment by the fixing screw 3.
[0012]
The suspension form for the workpiece is shown in FIG. 8 as an enlarged part of FIG. In general, two support blocks are used for each bundle of printed wiring boards or a large number of objects to be processed, and at least one of the blocks is slidably supported. The other support block can be fixed without being slidable unless it is necessary to suspend the workpieces having different widths at the center on the guide 4. The guides 4 are used in pairs when the printed wiring board is larger, and are preferably arranged in a horizontal plane and parallel to each other at an interval of, for example, 50 mm to 500 mm. For example, in order to improve the production amount, when a plurality of wiring boards are installed side by side and conveyed in parallel at the same time, four or more support blocks must be fixed side by side on the guide 4. Is also possible. In this case, a supplementary vertical support element 11 is also required for each support block.
[0013]
The support block 2 is provided with support rails (support elements) 5 for printed circuit boards to be fixed on the respective sides. One suspension pin 6 is attached to each lower end of the support rail. In order to fix the object 7 to be processed, a fixing hole 19 (in most cases, an existing positioning hole) existing therein is covered with the pin. As a result, the printed wiring board or the printed wiring foil is first hung on the pin 6 without being fastened. In order to prevent the workpiece from unexpectedly slipping from the suspension pin 6, the pin is supported so as to face obliquely upward from the rail 5. In this case, the angle can be varied from 5 degrees to about 45 degrees with respect to the support rail. Instead of the diagonal arrangement, the suspension pin 6 may also be provided with a flange (ring collar) for preventing the object to be treated, for example a printed wiring foil, from slipping. Similarly, a fixing hole 19 is provided below the workpiece.
[0014]
Two vertical support elements 11 are fixed near the outer end of the side beam 20, for example, for each rack side surface. These consist, for example, of two vertical metal bars on each side of the stacking rack, which in the illustrated example of FIG. If the support element 11 is made of a material having an appropriate strength and the tension roller 12 is in an appropriate place, the lateral connecting portion 21 may be omitted. This is especially true when anodes are placed between the printed wiring boards, which are passed between the two printed wiring boards and on the outer overlapping surface, respectively, when the stacking rack is submerged in one plating bath. This is advantageous. In order to further strengthen the support, the vertical support element 11 can be connected with a lateral element (not shown) oriented in the same direction as the lateral beam 20 in the center and / or in the lower part. At least one tension roller 12 is mounted below each vertical support element 11.
[0015]
The workpiece 7 is supported from the left and right by one tension block 8 on the lower side. The tension block 8 is shown in detail in FIG. 2 according to the section II-II in FIG. This can be made of plastic or metal, depending on the conditions of the wet chemical method used, respectively. If electroplating is done using a stacking rack, the outside of the metal frame used should be electrically insulated. In the tension block 8, a groove 22 is cut for each object piece to be supported, and is cut off by, for example, a milling machine. In order to simplify the figure, for example, only five grooves are shown corresponding to five printed wiring foils. Usually the number is higher. For example, 10 to 50 printed wiring foils can be envisaged depending on the quantity to be produced by one device as an average value. The width of the groove 22 should be selected such that the treatment liquid does not adhere to the gap between the workpiece 7 and the groove wall, and the adhesion increases the amount of treatment liquid from the bath to the bath. It will be. When the groove width is usually 5 mm or more, no entrainment is observed. The interval between the workpiece 7 and the workpiece 7 depends on the type of processing. In any case, the interval must be selected so that the fluid can be exchanged quickly in order to shorten the processing time.
[0016]
A hole through which the fixing rod 9 is inserted passes through the tension block 8. At that time, the workpiece 7 is passed through the provided hole 19. The fixing bar 9 has a sharp front end for easy passage. Surprisingly, it turned out that there was no problem in actually passing this rod. For this purpose, the tension block 8 is suspended without being fixed in the vicinity of the support rail 5 by an operator, and is pushed upward to a bundle of printed wiring boards provided at the same interval. Then it is moved down to the lower fixing hole 19. Due to the guiding properties of the groove 22 in the tension block 8, the fixing rod 9 can be easily pushed through the block and the bundle of workpieces. Thereafter, the safety bar 14 ensures that the fixing bar 9 is not slipped during conveyance. The safety device 14 consists of a threaded fixing rod and nut, or other means such as a split pin or a safety ring. Similar steps are performed in the lower half of the workpiece. Finally, the elastic tension belt 13 is stretched downward on both sides via the tension roller 10 attached to the tension block 8 and downward on the side, and suspended via the tension roller 12 provided. In the illustrated example, four tension belts are used. Two tension belts are attached to the left and right of the back side of the bundle, and two are attached to the front side of the bundle as seen in FIG. When a hook that protrudes from the tension block 8 at the lower side and is arranged at the center along the side surface is used instead of the tension roller 10 arranged at the end face of the tension block 8, the bundle is formed of two tension belts. Even 13 can be securely held. This type of hook is not shown in the drawing.
[0017]
In the embodiment shown, the tension roller 12 must likewise be arranged in the middle of the vertical support elements 11 on both sides. In the tension belt 13, the tension must be selected so that the workpiece is firmly fixed on the one hand, but the fixing hole 19 is not damaged on the other hand. When only two tension belts 13 are used, the tension for each belt is increased as the number decreases. When the workpiece is extremely thin, the fixing hole 19 may be reinforced with a metal coating around the fixing hole in order to prevent the hole from tearing due to a load of tension.
[0018]
Suitable materials for tension belts are, for example, elastic and chemically stable plastics such as EPDM, as well as springs made of rubber mixtures or stable materials, depending on the aggressiveness of the chemicals used respectively. .
[0019]
To remove the processed object, the reverse order is performed. First, the tension belt 13 is removed, and then the safety device 14 and then the fixing rod 9 are removed. When removing the fixing rod, the tension block 8 needs to be supported or held by hand to prevent the tension block 8 from falling. The tension block 8 is removed after the fixing rod 9 is completely out. If both tension blocks are removed, the printed wiring board can be easily lifted from the upper suspension pin.
[0020]
If the printed wiring foil is very thin as the object 7 to be processed, there is a risk that the hole 19 may be torn or if the hole at the edge of the printed wiring foil is not suitable, the stacking rack as illustrated in FIG. Style devices can be used. In this embodiment, the suspension pin 6 on the support rail 5 is replaced by an improved tension block 18. The tension block 18 is fixed to the support rail 5 without moving. The second upper tension block 18 on the opposite side can be horizontally accommodated in the fragile workpiece 7, for example, movably accommodated in the support rail 5 by a long hole (not shown), and stretched outward by the tension belt 13. . As a result, the tension belt takes into account the corresponding longitudinal expansion, so that it is guaranteed that the printed wiring foil does not distort upward in a horizontal state. Unlike the case of the stacking rack corresponding to FIG. 1, only one support rail 5 per side of the bundle is sufficient for each support block 2. However, in order to further increase the strength of the structure, a plurality of support rails 5 can be used, for example, two per side.
[0021]
This type of tension block 18 can also be used below the workpiece to be used instead of the tension block 8. In FIG. 4, the lower right modified tension block 18 is shown in detail. The printed wiring foil 7 is shown with a reduced height for easier understanding of the illustration. In this example, the tension block 18 is arranged diagonally and has two longitudinal through holes through which the fixing rod 9 passes.
[0022]
This tension block 18 is composed of a number of individual fastening pieces 23 shown in FIG. 5 corresponding to the number of printed wiring foils 7 to be fixed, which are guided by two fixing rods 9 and held together. Has been. The anode is indicated by the numeral 5. In this description, the fixing rod 9 does not have to be removed for mounting and removing the workpiece. This is because the printed wiring foil is clamped for fixing and is not threaded (through the hole). The object 7 to be processed in the tension block 18 is firmly fixed by a tightening device. Tightening is performed by pulling the fixing rod 9 with a screw and a wing nut, an eccentric lever quick stopper, a toggle lever, or other tool suitable for tightening as shown in the example of FIG. To open the clamping piece 23, the clamping device on the fixing rod 9 is loosened. In order to help open, a spring element 24 made of, for example, a compression spring or an elastic plate (packing) can be incorporated between the clamping pieces 23. These are shown only under the two printed wiring foils to simplify FIG. Spring elements 24, which are respectively arranged between adjacent clamping pieces 23, are attached to the fixing bar 9 and can assist the opening function. As soon as the fixing bar 9 is loosened to remove the printed wiring foil, i.e. when it is unfastened, the spring element spreads and widens the distance between the two clamping pieces 23 as long as the fixing bar 9 accepts.
[0023]
The workpiece is sandwiched between the small clamping blocks 17 fixed to the fastening pieces 23, not between the fastening pieces 23 themselves. The small clamping block 17 is shown in a side section in FIG. In contrast to the small clamping block 17, a counter receiving portion 16 which is similarly arranged diagonally with respect to the small clamping block 17 in the tension block 18 is used. In order to clamp the workpiece as gently as possible, the small clamping block 17 and the counter receiving portion 16 are also preferably made of an elastic material such as soft rubber or soft plastic. For the electrolytic treatment, the material of the clamping block 17 and the clamping piece 23 must be conductive at least in the interior and on the contact surface. The counter receiving portion 16 and the small clamping block 17 may take a band shape as illustrated in FIG. 5 or a ring shape as illustrated in FIG.
[0024]
A single fixing rod with a clamping mechanism that can change the effective clamping length of the fixing rod when printed wiring foil with only a small difference in film thickness (almost the same thickness) is to be transported 9 is enough. The second fixing rod 9 can be provided with a preselected fixing adjustment. Since the entire bundle is simultaneously tightened using the fixing rods 9 and the substrate is not placed in the hole at the suspension pin, a supplementary auxiliary device (not shown) is required for mounting and removal. . In the auxiliary structure, the printed wiring foil can be inserted into the groove of the upper tension block 18 one by one from the bottom, and must remain in that position until it is stretched without slipping again from the groove. Don't be. In the simplest case, this is a flat, flattened surface of the harder workpiece 7 that is mounted under the stacking rack at intervals depending on the height of the printed wiring foil. Very well suited for this is a flat plate with, for example, V-groove cuts, which extend parallel to each other and polished at the same interval as that of the superimposed printed wiring foils. When the workpiece is firmly clamped at the upper part, the lower tension block 18 can enter by hand from the side through the bundle of printed wiring boards and be firmly fixed. The structure of the lower fastening piece 23 basically corresponds to the upper fastening piece 23. They are simply flipped vertically and have a tension roller 10. After the workpiece is fastened to the tension block 18 from the left and right, the tension belt is suspended. As a result, the printed wiring board is securely held in the stacking rack.
[0025]
In FIG. 6, a plurality of embodiments for holding the workpiece 7 in the tension block 18 are shown in the same manner as the cross section in FIG. 5. In contrast to the examples shown so far, here each work piece is individually clamped and the tension block 18 consists of a piece rather than a separate element. The tension block 18 has, for example, screw holes and complementary clamping screws 28 for each workpiece. The tightening screw 28 directly presses the workpiece when tightening. In another embodiment, the eccentric 31 presses the workpiece. In another embodiment, the fastening lever 26 acted by the tension screw 28 presses the workpiece. As described above, the small clamping block 17 is provided here as a countermeasure receiving portion. When the clamping lever 26 is used, the opening of the clamping lever 26 can be assisted by the spring element 27. The spring element 27 may be a compression spring configured as an elastic plastic material having elasticity. The advantage of this embodiment is that it does not require an auxiliary structure for holding the object 7 to be processed using a fixing rod until it is tightened. This embodiment is therefore particularly suitable for the upper tension block 18.
[0026]
In FIG. 5, the anode 15 is shown by a broken line for the sake of completeness as described above. They are anodes opposite to the workpiece 7 that is polarized to the cathode during electroplating. If metal electrodeposition is performed using a stacking rack, at least the upper small clamping block 17 must be conductive and connected to the cathode of the DC power source. It is directed, for example, from the small clamping block 17 through the tension block 18 or the clamping piece 23, in this case via a conductive connection to the guide 4 which must be conductive, to the support 25 (FIG. 3). Can be achieved. The support base 25 is connected to a power source via a conductive routing guide 30. If the workpiece is etched, the workpiece is connected to the anode of the power supply and the opposite electrode is connected to the cathode.
[0027]
The elements of the stacking rack according to FIGS. 1 and 3 can be partially combined with one another. Therefore, it is possible to use the support rail 5 with the suspension pin 6 on the upper surface for suspending the object to be processed and the tension block 18 at the remaining three corners as shown in FIG. This makes it easy to suspend the workpiece 7 and avoids the drawbacks of the rigid upper suspension according to FIG. In particular, the upper tension block 18 with each clamped workpiece according to FIG. 6 can be associated with the lower tension block 18 of FIG. 5 which clamps the workpieces in common. Further, the object to be processed can be clamped with a tension block having another configuration. Various possibilities in this regard are illustrated in FIG. For example, the printed board 7 in the tension block 18 can be fastened to each board one by one with a fastening screw 28 attached obliquely, or can be fastened via a tightening lever 26 or an eccentric ring 31. In this case, as shown in FIG. 6, the tension block is formed of a single piece, and the tightening lever and the tightening screw are substituted for the fixing rod.
[Brief description of the drawings]
FIG. 1 is a general view of an apparatus according to the invention of a stacking rack type in which an object to be processed is held in a fixed shape in a fixed hole by a tension block.
2 is a cross-sectional view taken along section line II-II through the tension block of the stacking rack of FIG. 1. FIG.
FIG. 3 is an overall view of an apparatus according to the invention of an overlap rack type in which an object to be processed is clamped and held by a tension block.
4 is an enlarged view of a tension block of the same stacking rack as in FIG. 3. FIG.
5 is a cross-sectional view seen from the side of the cut surface VV of the tension block of the stacking rack of FIG. 4;
6 is a cross-sectional view similar to FIG. 5 of a tension block instead of FIG. 5 in which each workpiece is fixed via a fastening element.
7 is a perspective view of the stacking rack according to FIG. 1. FIG.
8 is a side cross-sectional view of a detail A in a manner of suspending an object to be processed at a cutting plane VIII-VIII in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support arm for conveying stacking rack 2 Support block 3 Fixing screw for support block 4 Guide (guide) for support block
5 Support rail for processing object 6 Suspension pin for processing object 7 Flat processing object (printed wiring board, printed wiring foil)
8 Tension block 9 Fixing bar 10 Tension roller 11 in tension block Vertical support element 12 Tension roller 13 in support element Tension belt 14 Safety device 15 Anode 16 Counter-receiving part 17 Small clamping block 18 Tension block 19 with clamping fixture Fixing hole 20 in workpiece 21 Lateral beam 21 on support arm Lateral connection 22 Groove 23 for receiving printed wiring board Tightening piece 24 Resilient element 25 for fastening piece Support base 26 Tightening lever 27 Tension lever Spring element 28 Tightening screw 30 Routing guide 31 Eccentric ring

Claims (13)

At least one guide (4) at least two brackets are connected by (1) and configured with a superimposed rack having a vertical support element (11), at least two flat arranged one behind the other an apparatus for in the conveying and wet chemical and / or electrolytic treatment of a very thin object to be processed on SL workpiece which has been placed in one of the bundle of,
For holding an object to be processed on one side, with the use fixture (3) at least one guide (4) fixable at least two support blocks (2), and hangers (6) Support element (5),
At least two tension blocks (8) for fixing the first suspension element (10) for holding the object to be processed with a tensile load in the stacking rack on the other side, in the attachment hole (19) of the object to be processed fixing bar which engages (9), the second suspension element (12) which is fixed to the vertical support element (11), and taut in the first suspension element (10) and said second suspension element (12) Tension element (13 )
A device characterized by. At least one guide (4) at least two brackets are connected by (1) and configured with a superimposed rack having a vertical support element (11), at least two flat arranged one behind the other an apparatus for in the conveying and wet chemical and / or electrolytic treatment of a very thin object to be processed on SL workpiece which has been placed in one of the bundle of,
At least two support blocks (2) having at least two support elements (5), which can be fixed to at least one guide (4) by means of a fixture (3);
Upper and lower tension blocks (18) each having a fixed at least one first suspension element (10),
A fixing rod (9) provided with a clamping tool for clamping the printed wiring board in a clamped state and penetrating the tension block in the longitudinal direction;
At least one second suspension elements against each support element (11) (12), and pull for holding an object to be processed with a tensile load at hanging and piled rack on the suspension element (10, 12) Fixable tension element (13)
A device characterized by. 2. Device according to claim 1, characterized in that the hanger (6) attached to the support element (5) extends upward from the support element at an angle of 5 [deg.] To 45 [deg.]. 2. A device according to claim 1, characterized in that the hanger (6) attached to the support element (5) has a hook-like shape with the ends facing upwards. Hanger that comes with supporting elements (5) (6) A device according to claim 1, characterized in that it comprises a pin having a flange at the end remote from the element support for preventing slippage of the workpiece.   The tension block (18) is equipped with an individual clamping piece (23) with a small clamping block (17) and a counter-receiving part (16) for holding the workpiece. The device described.   The small clamping block (17) and the counter-receiving part (16) are electrically conductive, via the conductive clamping piece (23) and / or the tension block (18), the support block (2) and the guide (4). The apparatus according to claim 2, wherein the apparatus is connected to a power source.   8. Device according to claim 2, 6 or 7, characterized in that the small clamping block (17) and the counter-receiving part (16) are made of an elastic material.   9. Tension block (8, 18), wherein each groove (22) for receiving an object to be processed there flows away the processing fluid essentially unblocked. The apparatus as described in any one of.   The fixing rod (9) consists of a screw fixing nut, a split pin or a safety ring, a tension eccentric ring or a bending lever against unintentional sliding or detachment of the tension block (8, 18) or workpiece (7). 10. The device according to claim 1, further comprising a safety device.   Two fixing bars (9) are provided for each tension block (18), with one fixing bar having a pre-adjusted length and the other fixing bar being an effective part of the fixing bar. The apparatus according to claim 2, further comprising a tightening mechanism capable of changing a length.   The tension block (18) comprises an individual direct clamping device for each workpiece (7) in one tension block (18), which comprises a clamping screw (28) and / or an eccentric ring (31). The apparatus according to claim 2.   3. The tension block according to claim 2, characterized in that the tension block (18) comprises a clamping device comprising a clamping screw (28), a spring element (27) and a clamping lever (26) for each workpiece. The device described.

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