JP5613499B2 - Surface treatment equipment - Google Patents

Description

  The present invention relates to a surface treatment apparatus such as a continuous plating apparatus.

  2. Description of the Related Art As a surface treatment apparatus, for example, an electroplating treatment apparatus for plating a work surface, a continuous plating treatment apparatus that continuously conveys a work such as a circuit board in a plating tank is known. The work is suspended and held by a conveyance jig conveyed along the power supply rail, and is continuously conveyed in the plating tank while being supplied with power from the power supply rail via the conveyance jig. In the plating tank, anodes are arranged on both sides of the work conveyance path serving as a cathode, and an electric field is formed between the cathode and the anode to electrolyze the plating solution to plate the work surface.

  Here, instead of the structure in which the power supply rail is arranged above the plating tank (Patent Document 1), a structure in which the power supply rail is extended in parallel with the longitudinal direction of the plating tank at a position deviated from above the plating tank. Known (Patent Document 2). This is excellent in that dust generated when the conveying jig slides on the power supply rail can be prevented from falling into the plating tank.

Japanese Patent No. 3025254 Japanese Patent No. 3591721

  When the power supply rail is arranged at a position off the upper side of the plating tank as in Patent Document 2, the work is cantilevered unlike the form of supporting the transfer jig and the work by hanging on the power supply rail as in Patent Document 1. It becomes a support state. As a result, the center of gravity of the transport jig and the work is deviated from the vertical line passing through the power supply rail, and an unnecessary moment acts on the transport jig.

  Therefore, the conveyance jig disclosed in Patent Document 2 has a more complicated structure than the jig disclosed in Patent Document 1. In Patent Document 2, a detachment prevention rail is provided on the side surface of the power supply rail to prevent the conveyance jig from falling off, and the structure of the power supply rail is also complicated.

  Some aspects of the present invention improve the structure of a transport jig that is transported along a power supply rail that has a rectangular outline in a longitudinal section arranged at a position deviated from the upper side of the plating tank. A surface treatment apparatus capable of stably supporting a conveying jig regardless of the above is provided.

A surface treatment apparatus according to an aspect of the present invention includes:
A surface treatment tank;
At a position deviated from above the surface treatment tank, a power supply rail extending in parallel with the longitudinal direction of the surface treatment tank,
A plurality of transfer jigs that are arranged in the surface treatment tank to hold the workpieces and are supported by the power supply rails,
Continuous conveying means for continuously conveying the plurality of conveying jigs along the power supply rail;
Have
The power supply rail includes, in a longitudinal section, an upper surface, a lower surface, a first side surface on the surface treatment tank side, and a second side surface facing the first side surface,
Each of the plurality of transport jigs is
A guided portion guided by the power supply rail;
A connecting portion extending in the horizontal direction from the base end portion on the guided portion side toward the free end portion;
Connected to the free end of the connecting part, and a holding part for holding the workpiece in a suspended state;
Have
The guided portion is
A power-supplied portion in contact with the upper surface of the power supply rail;
At least one first roller in rolling contact with the first side surface of the power supply rail;
At least one second roller in rolling contact with the second side surface of the power supply rail;
A meshed portion meshed with the continuous conveying means;
Have
The first height position where the at least one first roller is in rolling contact with the first side surface is lower than the second height position where the at least one second roller is in rolling contact with the second side surface. .

  In one aspect of the present invention, a power supply rail extending parallel to the longitudinal direction of the surface treatment tank is provided at a position deviated from above the surface treatment tank, and the conveyance jig is conveyed along the power supply rail. Yes. Therefore, the dust generated by the sliding contact between the power supply rail and the conveying jig does not fall into the surface treatment tank.

  Further, the first height position H1 at which the first roller rolls into contact with the first side surface of the power supply rail is lower than the second height position H2 at which the second roller rolls into contact with the second side surface. Thereby, since it is a cantilever support state, the inclination angle of the conveyance jig to which the bending moment M of the same direction always acts can be made small.

  In one aspect of the invention, the at least one first roller may be in rolling contact with a lower end portion of the first side surface, and the at least one second roller may be in contact with an upper end portion of the second side surface.

  This is because the first height position H1 of the first roller 302 is preferably as low as possible, and is preferably in contact with the lower end portion of the first side surface 201C of the power supply rail 201. Although the second height position H2 of the second roller is not regarded as important with respect to the bending moment M, it is better to dispose the second roller at a position closer to the guided portion because the guided portion is in contact with the upper surface of the power supply rail. It is preferable in terms of taking.

  In one aspect of the present invention, the connecting portion has a thickness T in the vertical direction between the upper end surface and the lower end surface, and the height position of the upper end surface and the height position of the lower end surface of the connecting portion. Between the second height position of the at least one second roller.

  In this way, by causing the second roller to roll-contact with the second side surface of the power supply rail at the second height position H2 within the range of the thickness T of the connecting portion, the movement reaction force F acting on the second roller can be reduced. It can reduce that the bending moment which acted on acts on a connection part.

  In one aspect of the present invention, the first height position of the at least one first roller can be positioned below the height position of the lower end surface of the connecting portion. This is because, as described above, the lower the first height position H1 of the first roller, the better.

  In one aspect of the present invention, any one of the at least one second roller and the at least one first roller includes a transport leading end side position, a transport trailing end side position, and a transport leading end side of the guided portion. Each having a total of three rollers at a first intermediate position between the position and the transport rear end side position, and either one of the at least one second roller and the at least one first roller is , A total of two each at a second intermediate position between the transport leading end position and the first intermediate position, and at a third intermediate position between the first intermediate position and the transport rear end position. Can have rollers.

  The power supply rail for transporting the transport jig and guide rails (hereinafter referred to as rails) before and after the power supply rail cannot be formed by one, but are formed by arranging a plurality through a joint. Here, the attitude | position of a conveyance jig | tool becomes settled when three 1st, 2nd rollers of 5 roll-contact with either one of two adjacent rails. Strictly speaking, the two adjacent rails may not be in a straight line, but it is possible to suppress the deviation of the two rails from adversely affecting the posture of the conveying jig.

  In one aspect of the present invention, the guided portion has a support plate that supports the at least one first roller, and the support plate is in a horizontal direction perpendicular to the power supply rail with respect to the guided portion. The position can be adjusted.

  Thereby, the horizontal position of the first roller can be adjusted. Therefore, the interval between the first and second rollers can be optimally adjusted according to the thickness between the first and second side surfaces of the power supply rail.

  In one aspect of the present invention, each of the plurality of conveying jigs may further include at least one third roller that is in rolling contact with the lower surface of the power supply rail.

  If it carries out like this, it can prevent that a conveyance jig fluctuates up and down with respect to a feed rail. Therefore, the traveling of the conveying jig is more stable. In addition, the power supply rail can be sandwiched between the power-supplied part and the third roller. Therefore, the third roller can prevent the inclination of the conveying jig due to the bending moment M acting on the conveying jig in the cantilever state.

  In one aspect of the present invention, the at least one third roller is movably supported at a first position where the at least one third roller is in rolling contact with the lower surface of the power supply rail and a second position at which the at least one third roller is detached from the lower surface of the power supply rail. May be.

  If it carries out like this, a conveyance jig can be attached to an electric power feeding rail in the state which retracted the 3rd roller to the 2nd position. Thereafter, the third roller is brought into contact with the lower surface of the power supply rail by advancing the third roller to the first position.

  In one aspect of the present invention, the guided portion includes an urging member that moves and urges the at least one third roller toward the first position, and at least the urging force of the urging member. And a stopper for holding one third roller in the second position.

  If it carries out like this, a 3rd roller can be easily set to the 1st, 2nd position by engagement and release of a stopper.

  In one aspect of the present invention, each of the plurality of conveying jigs further includes at least two third rollers that are in rolling contact with the lower surface of the power supply rail, and the at least two third rollers are configured to be the second intermediate rollers. It can be provided on the transport front end side with respect to the position and on the transport rear end side with respect to the third intermediate position.

  This is because the traveling of the conveying jig is more stable when the two third rollers are arranged apart from each other. In addition, it is easier to operate the stopper when the third rollers are arranged on both ends rather than near the center of the guided portion.

A surface treatment apparatus according to another aspect of the present invention includes:
A surface treatment tank;
At a position deviated from above the surface treatment tank, a power supply rail extending in parallel with the longitudinal direction of the surface treatment tank,
A plurality of transfer jigs that are arranged in the surface treatment tank to hold the workpieces and are supported by the power supply rails,
Continuous conveying means for continuously conveying the plurality of conveying jigs along the power supply rail;
Have
Each of the plurality of transport jigs is
A guided portion guided by the power supply rail;
A connecting portion extending in the horizontal direction from the base end portion on the guided portion side toward the free end portion;
Connected to the free end of the connecting part, and a holding part for holding the workpiece in a suspended state;
Have
The guided portion includes a meshed portion meshed with the continuous conveyance unit,
The continuous conveyance means includes a chain that is continuously conveyed and a plurality of toothed blocks that are fixed to the chain.
Each of the plurality of toothed blocks has a plurality of teeth;
The meshed portion includes N (N is an integer of 2 or more) claw members meshed with any of the plurality of teeth of the plurality of toothed blocks,
The N claw members are arranged such that at least the meshing tip position is shifted by P1 / N with respect to the teeth of the plurality of toothed blocks when the tooth pitch of the toothed block is P1. And

  When the conveying jig receives an external force from a pusher or the like and transfers to the power supply rail, the claw member of the conveying jig is engaged with the teeth of the toothed block when the external force disappears and is conveyed by the continuous conveying means. If the claw member is not meshed with the teeth of the toothed block at the moment when the external force is lost, the toothed tooth is moved by the chain until it meshes with any of the N claw members shifted by P1 / N pitch. The block only needs to be moved by P1 / N. Therefore, the allowable deviation amount of the conveying jig with respect to the continuous conveying means is reduced to P1 / N.

  In another aspect of the present invention, the chain connects a plurality of inner links that respectively support two rollers between two inner plates and two adjacent inner links between two outer plates. A plurality of outer links, and each of the plurality of outer links includes a fixing portion that fixes the plurality of toothed blocks, and the tooth pitch P1 can be smaller than the pitch P2 of the two rollers. .

  That is, the pitch P1 can be made smaller than the roller pitch P2 of the chain while adopting a highly reliable chain as the continuous conveying means.

  In another aspect of the present invention, the tooth pitch P1 may satisfy G / 3 ≦ P1 <G / 2, where G is a design value interval between two adjacent workpieces in the surface treatment tank. it can.

  In order to increase the positional accuracy of the conveying jig, the tooth pitch P1 of the toothed block may be reduced. However, in terms of the relationship with the gap G between the workpieces, it is preferable to satisfy P1 <G / 2. Even if the preceding transport jig is shifted backward by 1 pitch and the subsequent transport jig is shifted forward by 1 pitch, G-2 × P1> 0, and adjacent transport jigs may collide with each other. Because there is no. That is, regardless of the preceding and following, a positional deviation of ± 1 pitch P1 is allowed so that the conveying jigs do not collide with each other. In particular, as described above, considering that the allowable deviation amount of the conveying jig with respect to the continuous conveying means is P1 / N (less than one pitch P1), the conveying jigs do not collide with each other. The lower limit of the pitch P1 is preferably P1 ≧ G / 3 from the viewpoint of securing the tooth strength of the toothed block.

It is a schematic plan view of the continuous plating apparatus which concerns on embodiment of this invention. It is a figure explaining the operation | movement which conveys intermittently the conveyance jig | tool to a plating tank, and conveys a conveyance jig continuously in a plating tank. It is a figure explaining the operation | movement which conveys a conveyance jig intermittently in a part of pretreatment tank. It is a figure explaining the operation | movement which conveys a conveyance jig intermittently in the other part of a pre-processing tank. It is a schematic longitudinal cross-sectional view of a plating tank. It is a schematic perspective view of a conveyance jig. It is a figure which shows the 1st, 2nd roller of a conveyance jig. It is a figure which illustrates arrangement | positioning of a 1st roller, and the inclination of a conveyance jig typically. It is a figure explaining arrangement | positioning of the 1st-3rd roller of a conveyance jig. It is a top view which shows the state which a part of a total of five 1st, 2nd rollers got over the joint between the two guide rails which form a conveyance path. FIG. 11A is a front view of the third roller, and FIG. 11B is a plan view of the third roller. FIG. 12A is a diagram illustrating a state in which the third roller is in the retracted position, and FIG. 12B is a diagram illustrating a state in which the third roller is in the rolling contact position. FIG. 13A is a front view of the chain and the toothed block, and FIG. 13B is a back view of the chain and the toothed block. It is the B section enlarged view of Drawing 13 (A). It is a figure for demonstrating the shift | offset | difference of the meshing front-end | tip position of a nail | claw member.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as means for solving the present invention. Not necessarily.

1. Overview of Surface Treatment Apparatus FIG. 1 is a plan view of a surface treatment apparatus, for example, a continuous plating treatment apparatus. The continuous plating apparatus 10 includes a circulation conveyance path 100 in which a plurality of conveyance jigs 30 respectively holding workpieces 20 such as circuit boards are circulated and conveyed along, for example, a clockwise circulation conveyance direction A in FIG. In FIG. 1, some of the workpieces 20 and some of the conveying jigs 30 are not shown.

  In the circulation conveyance path 100, a plating tank (surface treatment tank in a broad sense) 200 for surface-treating, for example, plating the workpiece 20 held on each of the plurality of conveyance jigs 30, and the circulation conveyance path 100 more than the plating tank 200. An unprocessed workpiece 20 provided upstream and a carry-in portion 210 for carrying in the plurality of conveyance jigs 30, and a processed workpiece 20 provided downstream of the circulation conveyance path 100 with respect to the plating tank 200 from the plurality of conveyance jigs 30. An unloading unit 220 for unloading is provided.

  The circulation conveyance path 100 includes a first straight conveyance path 110, a second straight conveyance path 120 parallel to the first straight conveyance path 110, and a plurality of circulation conveyance paths 100 from one end of the first straight conveyance path 110 to one end of the second straight conveyance path 120. The first turning device 130 that horizontally delivers at least one of the conveying jigs 30 and the other end of the first straight conveying path 110 from the other end of the second straight conveying path 120 to at least one of the plurality of conveying jigs 30. And a second turning device 140 for horizontally turning and delivering the two.

  In the present embodiment, the plating tank 200 is provided along the second straight conveyance path 120, and the carry-in part 210 and the carry-out part 220 are provided in the first straight conveyance path 110. The circulation conveyance path 100 may further include a pretreatment tank group 230 disposed on the upstream side of the plating tank 200 and a posttreatment tank group 240 disposed on the downstream side of the plating tank 200.

  In the pretreatment tank group 230, for example, a degreasing tank 230 </ b> A, a hot water washing tank 230 </ b> B, a water washing tank 230 </ b> C, a shower tank 230 </ b> D, and a pickling tank 230 </ b> E are sequentially arranged between the carry-in unit 210 and the plating tank 200. Consists of. The post-treatment tank 240 is configured by arranging, for example, a shower tank 240A and a water washing tank 240B in this order from the upstream side between the plating tank 200 and the carry-out unit 220. Note that the number and type of the pretreatment tank group 230 and the posttreatment tank group 240 can be changed as appropriate. Moreover, in the present embodiment apparatus, the work 20 turned by the first turning device 130 is washed in the shower tank 230D during turning. Similarly, the workpiece 20 turned by the second turning device 140 is washed in the shower tank 240A during turning.

  Except for the shower tanks 230D and 240A in the pre-treatment tank group 230 and the post-treatment tank group 240, the conveyance jig 30 is intermittently conveyed. For this purpose, the pretreatment tank group 230 and the post-treatment tank group 240 are provided with two types of guide rails that convey and guide the conveyance jig 30. One is fixed rails 232, 234, 235, 242, and 243 for intermittently transporting the transport jig 30 in the same processing tank. The other one is elevating rails 231, 233, 236, and 241 that can intermittently convey the conveyance jig 30 across the partition walls between different treatment tanks.

  In the first and second straight conveyance paths 110 and 120 other than the shower tanks 230D and 240A of the pretreatment tank group 230 and the posttreatment tank group 240, one or a plurality of conveyances are performed along the two types of guide rails and the guide rails. The conveying jig 30 is intermittently conveyed by a pusher that moves the jig 30 by a unit distance. The intermittent conveyance operation will be described later with reference to FIGS.

  In the shower tanks 230D and 240A in the pretreatment tank group 230 and the posttreatment tank group 240, the conveyance jig 30 is intermittently conveyed by the first and second turning devices 130 and 140. For this purpose, the first turning device 130 includes two turning rails 131 and 132 that are integrally driven to rotate, and the second turning device 140 includes two turning rails 141 and 142 that are integrally driven to rotate. Have

  For example, in the first turning device 130, the transfer jig 30 is supported on one of the two turning rails 131 and 132 located on the upstream side in the circulation and conveyance direction, and the other located on the downstream side in the circulation and conveyance direction is empty. In this state, the two rolling rails 131 and 132 are integrally and intermittently driven by 180 °. The same applies to the second turning device 140. The work 20 held by the conveying jig 30 that is rotated by the first and second rotating devices 130 and 140 is subjected to shower cleaning in the shower tank 230D or the shower tank 240A. At this time, the shower tanks 230D and 240A do not need to contain a liquid for immersing the workpiece 20, so that even if there is a partition wall, it may be low, and the horizontal conveyance of the workpiece 20 is not hindered.

  As shown in FIG. 1, each of the two rolling rails 131, 132, 141, 142 provided in each of the first and second turning devices 130, 140 is in the stop position at the first, second, The four guide rails 234, 235, 242, and 243 respectively disposed at both ends of the straight conveyance paths 110 and 120 are arranged on a straight line with the corresponding ones.

  The plating tank 200 is provided with a power supply rail 201 extending in parallel with the longitudinal direction of the plating tank 200 in the plan view of FIG. The plurality of conveying jigs 30 supported by the power supply rails 201 are arranged in the plating tank 200 and hold the workpieces 20 respectively. Further, a continuous conveyance unit 400 that continuously conveys the plurality of conveyance jigs 30 along the power supply rail 201 is provided along the power supply rail 201. The continuous conveyance operation will be described later with reference to FIG.

  The circulation conveyance path 100 further includes a jig return conveyance path 150 extending from the carry-out section 220 to the carry-in section 210 of the first straight conveyance path 110. The jig return conveyance path 150 includes, for example, two endless chains 151 and 152. The jig return conveyance path 150 has a function of returning and conveying the empty conveyance jig 30 from the carry-out unit 222 to the carry-in unit 210 and a function of waiting the empty conveyance jig 30 on the upstream side of the carry-in unit 210. .

2. FIG. 2 shows a continuous conveyance operation of the conveyance jig 30 in the plating tank 200 and an intermittent conveyance operation of the conveyance jig 30 between the pickling tank 230E and the plating tank 200. It shows. FIG. 2 shows that among the three transfer jigs 30 supported by the lifting rail 236, the leading transfer jig 30 indicated by a chain line is transferred from the lift rail 230E to the position indicated by the solid line on the power supply rail 201. The state immediately after is shown.

  In FIG. 2, the lifting rail 236 can be lifted and lowered along the lifting shaft 252 by driving the lifting motor 250. The elevating rail 236 has a length that can support the four conveyance jigs 30, and two or three conveyance jigs 30 are supported in actual driving. Therefore, a space for supporting at least one conveyance jig 30 is provided as an empty space.

  Before the lifting rail 236 is lifted from the state of FIG. 2, the feeding jig 30 (not shown in FIG. 2) in the shower tub 230 </ b> D is fed so as to be supported by the lifting rail 236. . Thus, the elevating rail 236 carrying the three conveying jigs 30 is raised. An upper pusher 260 is disposed at the raised position. The upper pusher 260 has three feeding pieces 264 on the rod 262. The rod 262 can be moved forward and backward by a feed ball screw 268 driven by a feed motor 266.

  On the other hand, a first driving piece 320 (see also FIG. 6) is fixed to each of the three conveying jigs 30 instructed by the lifting rail 236. When the elevating rail 236 is raised, the three first drive pieces 320 are disposed in front of the three feed pieces 264 of the upper pusher 260. Thereafter, when the rod 262 is moved forward, the three feed pieces 264 moving forward together with the rod 262 push the three first drive pieces 320, and the three conveying jigs 30 are moved forward by a unit distance. Thus, the leading transport jig 30 is moved from above the pickling tank 230E to above the plating tank 200.

  Thereafter, the lifting rail 236 is lowered. Thereby, the leading conveyance jig 30 is arranged in the plating tank 200 as indicated by a chain line in FIG. Thus, in order to get over the partition wall 237 between different treatment tanks, the transport jig 30 is intermittently transported using the lifting rail 236 and the upper pusher 260.

  The leading conveyance jig 30 (illustrated by a chain line) supported on the lifting rail 236 is transferred from the lifting rail 236 to the power supply rail 201 by the lower pusher 270. The lower pusher 270 has a feed piece 274 supported by the rod 272. On the other hand, the transport jig 30 has a second drive piece 321 (see also FIG. 6) that can come into contact with the feed piece 274, and the second drive piece of the leading transport jig 30 supported on the lifting rail 236. 321 is arranged in front of the feed frame 274. Thereafter, when the rod 272 is moved forward, the feed piece 274 moving forward together with the rod 272 pushes the second drive piece 321 and the conveying jig 30 is moved forward in the arrow A direction by a unit distance. Thus, the leading transport jig 30 is moved from above the pickling tank 230E to above the plating tank 200. It is transferred from the elevating rail 236 to the power supply rail 201.

  At this time, the workpiece 20 supported by the subsequent conveyance jig 30 advanced by the rod 272 by the sequential control of the rod 272 is performed on the power supply rail 201 at a low speed and continuously. The workpiece 20 supported by 30 is arranged with a slight gap G. The narrower the gap G, the better. However, it is necessary to prevent interference between the preceding and succeeding workpieces 20, and the design value is set to 10 mm or a dimension before and after that. When the gap G is large, electrolysis concentrates on both ends of the work 20, so that the plating thickness at both ends of the work 20 becomes thick as so-called dog bone (dog bone), and in-plane uniformity cannot be ensured. Because.

  Next, with reference to FIG.3 and FIG.4, the operation | movement which conveys the conveyance jig | tool 30 intermittently in the pretreatment tank group 230 is demonstrated. 3 and 4, similarly to the intermittent transfer operation in FIG. 2, the intermittent transfer operation only in the same tank is performed using the lower pushers 280, 284, 286 and the fixed rails 232, 234, 235 and is different. In the case where the intermittent conveyance operation exceeding the partition wall 237 is included between the tanks, the intermittent conveyance operation is performed using the upper pusher 282 and the lifting rail 233. Although FIG. 4 shows a developed view from the washing tank 230C to the pickling tank 230E, the intermittent conveyance in the shower tank 230D is performed in place of the fixed rail instead of the stationary rail 131 or the rotating rail. The rail 132 is used, and the intermittent conveyance between the rolling rail 131 (132) and the fixed rails 234 and 235 before and after the rolling rail 131 (132) is performed by the lower pushers 284 and 286. Although the description of the intermittent transfer operation in the post-processing tank group 240 is omitted, it is performed in the same manner as described above using the rotating rails 141 and 142, the fixed rails 242 and 243, and a lower pusher (not shown).

3. Plating Tank FIG. 5 is a schematic sectional view of the plating tank 200. The plating tank 200 has a frame body 202 having an open top. Two anode boxes 203 are arranged opposite to each other in the frame body 202, and anode balls 203A that are consumables are accommodated in the anode box 203. Two rows of nozzle tubes 204 are arranged between the two anode boxes 203. A plurality of nozzles 204 </ b> A are fixed in a vertical row to each of the two rows of nozzle tubes 204, and the plating solution can be ejected toward both surfaces of the workpiece 20. The lower ends of the two rows of nozzle tubes 204 are respectively fixed to the distribution piping 205.

  On both sides of the workpiece 20, a guide member for conveying and guiding the workpiece 20 and a mask member for masking the upper and lower ends of the workpiece 20 can be provided. Furthermore, the height positions of the guide member and the mask member can be adjusted in accordance with the entire length of the workpiece 20. Since the mask member masks the upper and lower end portions of the work 20, it is possible to prevent the electric field from concentrating on the upper and lower ends of the work 20 and increasing the plating thickness.

4). As shown in FIGS. 5 and 6, the conveying jig 30 that holds the workpiece 20 includes a guided portion 300 guided by the power supply rail 201 and a free end portion from a base end portion on the guided portion 300 side. And a holding portion 340 that is connected to the free end of the connecting portion 330 and holds the workpiece 20 in a suspended state.

  Here, as shown in FIG. 6, the power supply rail 201 that guides the guided portion 300 has a vertical cross section of an upper surface 201A, a lower surface 201B, a first side surface 201C on the plating tank 200 side, and a first side surface 201C. It is a rectangular cross section which has 2nd side 201D which opposes. The shape of the power supply rail 201 is a guide rail (fixed rails 232, 234, 235, 242, 243, lift rails 231, 233, 236, 241, or rolling rail 131 that intermittently conveys the conveying jig 30 outside the plating tank 200. , 132, 141, 142).

  The guided portion 300 includes at least one power supplied portion 301 that is in contact with the upper surface 201A of the power supply rail 201, at least one that is in rolling contact with the first side surface 201C of the power supply rail 201, for example, two first rollers 302, and the first portion of the power supply rail 201. It has at least one, for example, three second rollers 303 that are in rolling contact with the two side surfaces 201 </ b> D, and a meshed portion 304 that meshes with the continuous conveyance means 400. Thus, the guided portion 300 having the power-supplied portion 301 that comes into contact with the upper surface 201A of the power supply rail 201 by its own weight is in contact with the first and second rollers 302 so as to sandwich the both side surfaces 201C and 201D of the power supply rail 201. , 303 to the power supply rail 201. Since the guided portion 300 itself guided by the power supply rail 201 is provided with a meshed portion 304 that meshes with the continuous conveyance means 400 and applies a conveying force to the guided portion 301, the guided portion 300 is provided with the power supply rail 201. The top is smoothly transported. As shown in FIG. 6, the guided portion 300 is provided with the first and second drive pieces 320 and 321 described above.

4.1. In this embodiment, as shown in FIG. 7, the first roller 302 is in contact with the first side surface 201C at the first height position H1, and the second roller 303 is the first height position H1. It is lower than the second height position H2 that is in rolling contact with the two side surfaces 201D. Thereby, since it is a cantilever support state, the inclination angle of the conveyance jig 30 to which the bending moment M of the same direction shown in FIG. 7 always acts can be made small. This is because when the bending moment M acts, the second roller 303 moves away from the power supply rail 201, whereas the first roller 302 is pressed by the power supply rail 201 and functions as a movement stopper. is there. This will be described with reference to FIG. FIG. 8 shows that the bending moment M acts on the L-shaped members L1 and L2 schematically showing the guided portion 300, and between the first side surface 201C of the power supply rail 201 and the tips of the L-shaped members L1 and L2. The inclination angles θ1 and θ2 when the L-shaped members L1 and L2 are inclined by the gap δ are shown. The L-shaped member L1 in contact with the first side surface 201C at the lower height position H1 is inclined by a relatively small angle θ1. On the other hand, like the L-shaped member L2, the L-shaped member L2 in contact with the first side surface 201C at the higher height position H2 is inclined by a relatively large angle θ2.

  The height position H1 of the first roller 302 is preferably as low as possible, and may be in rolling contact with the lower end portion of the first side surface 201C of the power supply rail 201. Although the height position of the second roller 303 is not regarded as important with respect to the bending moment M, the second roller 302 is disposed at a position close to the guided portion 300 because the guided portion 300 is in contact with the upper surface 201A of the power supply rail 201. This is preferable in terms of material removal. Therefore, the second roller 303 is preferably in rolling contact with the upper end portion of the second side surface 201D of the power supply roller 201.

  As shown in FIG. 7, the connecting portion 330 has a thickness T in the vertical direction between the upper end surface 331 and the lower end surface 332. Between the height position H3 of the upper end surface 331 and the height position H4 of the lower end surface of the coupling part 330, the second height position H2 of the second roller 303 is disposed. In this way, the second roller 303 is brought into contact with the second side surface 201D of the power supply rail 201 at the second height position H2 within the range of the thickness T of the connecting portion 330, thereby acting on the second roller 303. It can reduce that the bending moment resulting from the movement reaction force F (refer FIG. 7) acts on the connection part 330. FIG. Therefore, the movement of the conveying jig 30 becomes smooth.

  Speaking in relation to the thickness T of the connecting portion 330, the first height position H1 of the first roller 302 is positioned below the height position H4 of the lower end surface 332 of the connecting portion 330 as shown in FIG. Can be made. As described above, the lower the height position H1 of the first roller 302, the better.

4.2. FIG. 9 shows the position of the rollers provided in the transport jig 30 in the circulating transport direction A.

  For example, the three second rollers 303 include a transport leading end side position p1, a transport trailing end position p7, and a first intermediate position p4 between the transport leading end side position p1 and the transport trailing end side position p7. And one each. Also. For example, the two first rollers 302 include a second intermediate position p3 between the transport leading end side position p1 and the first intermediate position p4, and a third intermediate position between the first intermediate position p4 and the transport rear end side position p7. One is provided at each position p5. Unlike FIG. 9, three first rollers 302 may be disposed at positions p1, p4, and p7, and two second rollers 303 may be disposed at positions p3 and p5.

  FIG. 10 is a plan view showing a state in which a part of the total of the first and second rollers 302 and 303 has passed over the joint 102 between the two guide rails 101A and 101B forming the transport path 100. FIG. The five first and second rollers 302 and 303 in total are arranged in a staggered manner in a plan view. Here, the posture of the conveying jig 30 is determined by the three first and second rollers 302 and 303 rolling contact with one of the guide rails 101A and 101B. In the state shown in FIG. 10, the posture of the transport jig 30 is determined by the three first and second rollers 302 and 303 on the leading side in the transport direction A being in contact with the guide rail 101 </ b> A. In other words, the fact that the two first and second rollers 302 and 303 on the rear end side in the transport direction A are in contact with the guide rail 101B can be prevented from adversely affecting the posture of the feeding jig 30. Conversely, in the state before the state shown in FIG. 10, the posture of the transport jig 30 is determined by the three first and second rollers 302 and 303 on the rear end side in the transport direction A being in contact with the guide rail 101B. . In this case, it can be prevented that the two first and second rollers 302 and 303 on the leading side in the transport direction A are brought into contact with the guide rail 101A to adversely affect the posture of the transport jig 30.

  Strictly speaking, the two guide rails 101A and 101B may not be on a straight line. Therefore, there is a request to suppress the deviation of the adjacent guide rails 101A and 101B from adversely affecting the posture of the conveying jig 30, and this embodiment can solve the problem.

  In particular, when the workpiece 20 held by the conveying jig 30 travels in the liquid, if the workpiece 20 is tilted so that the posture of the workpiece 20 intersects the conveying direction A in a plan view, the workpiece 20 is subjected to the resistance of the liquid. There is a risk that the product value may be damaged by bending. This embodiment can suppress the occurrence of such a situation.

  In this embodiment, since the second roller 303 stabilizes and smoothes the transport movement of the transport jig 30 as described above, the maximum number of three is within the maximum length range in the circulating transport direction A. Arranged at equal intervals. On the other hand, since the 1st roller 302 prevents the inclination of the conveyance jig 30 with respect to the action of the moment M shown in FIG. 7, the function can be ensured even if it is less than the number of the 2nd rollers 303. Moreover, by arranging the first rollers 302 one by one between the two second rollers 303, it is possible to ensure a stable movement of the transport jig 30.

4.3. Third Roller As shown in FIG. 6, the guided portion 300 of the conveying jig 30 can further include at least one, for example, two third rollers 305 that are in rolling contact with the lower surface 201 </ b> B of the power supply rail 201. The third roller 305 will be described with reference to FIG. 11A as a side view and FIG. 11B as a plan view. Moreover, the retracted position and rolling contact position of the 3rd roller 305 are shown to FIG. 12 (A) (B).

  The guided portion 300 of the conveying jig 30 is in contact with the upper surface 201A of the power supply rail 201 and the lower surface 201B of the power supply rail 201 and the third roller 305 are in contact with each other. Can be prevented. Therefore, the traveling of the conveying jig 30 is more stable. Further, the power supply rail 201 can be sandwiched between the power-supplied part 301 and the third roller 305 at the top and bottom. Therefore, the 3rd roller 305 also has a function which prevents the inclination of the conveyance jig 30 by the bending moment M shown in FIG.

  Here, in the conveyance jig 30 of the present embodiment, the guided part 300 comes into contact with the four surfaces 201 </ b> A to 201 </ b> D in the longitudinal section of the power supply rail 201. In this case, the work of attaching the conveying jig 30 to the power supply rail 201 is complicated.

  Therefore, the third roller 305 is moved from the first position (the chain line position in FIGS. 11A and 11B and the position in FIG. 12A) where it makes rolling contact with the lower surface 201B of the power supply rail 201 and the lower surface 201B of the power supply rail 201. It is movably supported at the second position (the solid line position in FIGS. 11 (A) and 11 (B) and the position in FIG. 12 (B)). If it carries out like this, the conveyance jig 30 can be attached to the electric power feeding rail 201 in the state which retracted the 3rd roller 305 to the 2nd position shown to the continuous line of FIG. 11 (A) (B) or FIG. 12 (A). Thereafter, the third roller 305 is brought into contact with the lower surface 201B of the power supply rail 201 by advancing the third roller 305 to the first position shown by the chain line in FIGS. 11A and 11B or FIG.

  In this embodiment, a biasing member that moves and biases the third roller 305 toward the first position, for example, a coil spring 306, and the third roller 305 is held at the second position against the biasing force of the biasing member 306. And a stopper 307 to be provided. For example, the guided portion 300 includes a support portion 308 </ b> A of the third roller 305 that is integral with the support plate 308 that supports the first roller 302. It is fixed to one end of a bolt shaft 309 that passes through a hole (not shown) formed in the support portion 308A. A stopper 307 is fixed to the other end of the bolt shaft 309 by nuts 310 and 311. A coil spring 306 as an urging member is inserted through the bolt shaft 309 and is disposed between the third roller 305 and the support portion 308A. The stopper 307 is, for example, an L-shaped metal fitting. 11A and 11B and the state shown in FIG. 12A, the end of the stopper 307, which is an L-shaped bracket, comes into contact with the support portion 308A, so that the coil spring 306 is compressed and the third The roller 305 is retracted. When the stopper 307, which is an L-shaped bracket, is rotated by 90 °, the end of the stopper 307, which is an L-shaped bracket, is detached from the support portion 308A. Accordingly, the third spring 305 can be advanced as shown in the broken lines in FIGS. 11A and 11B and FIG. 12B by freely extending the coil spring 306.

  In the present embodiment, as shown in FIG. 9, the at least two third rollers 305 include a position p2 on the transport leading end side with respect to the second intermediate position p3 and a position p6 on the transport trailing end side with respect to the third intermediate position p5. And can be provided. This is because the traveling of the conveying jig 30 is more stable when the two third rollers 305 are arranged apart from each other. In addition, the stopper 307 is easier to operate when the third rollers 305 are arranged at both ends rather than near the center of the guided portion 300.

  As shown in FIGS. 12A and 12B, the power-supplied portion 301 of the guided portion 300 has a vertical wall 301A and is attached to the vertical wall 301A to support the first roller 302. 310B. The support plate 301B has an upright piece 301C facing the vertical wall 310A. This standing piece 301C is fixed to the vertical wall 301A by a bolt 301D. At this time, the position of the nut 301E which determines the horizontal position of the upright piece 301C can be adjusted. In this way, the position of the support plate 301 </ b> B can be adjusted in the horizontal direction perpendicular to the power supply rail 201 with respect to the power supplied portion 301. Thereby, the horizontal position of the first roller 302 can be adjusted. Thereby, according to the thickness between the 1st, 2nd side surfaces 201C and 201D of the electric power feeding rail 201, the space | interval between the 1st, 2nd rollers 302 and 303 can be adjusted optimally.

4.4. As shown in FIG. 6, the connecting portion 330 of the conveying jig 30 connects the guided portion 300 and the holding portion 340 that are arranged separately from each other. Since the conveyance jig 30 includes the connecting portion 330, the power supply rail 201 that guides the guided portion 300 of the conveyance jig 30 is positioned away from the upper side of the plating tank 200 as illustrated in FIG. 5. Thereby, dust generated when the guided part 300 slides on the power supply rail 201 does not fall into the plating tank 200.

  For example, two mounting pieces 331 and 332 are fixed to the connecting portion 330. The two placement pieces 331 and 332 are placed on the two chains 151 and 152 of the return conveyance path 150 shown in FIG. 1, and the conveyance jig 30 is conveyed back along the return conveyance path 150.

4.5. Holding Unit The holding unit 340 includes a plurality of, for example, three chuck units 341 that chuck the upper portion of the workpiece 20 as illustrated in FIG. 6. A movable chuck portion 342 can be provided on both sides of the three chuck portions 341 as standard equipment or as an option so that the workpiece 20 having a wide width can be held. The movable chuck portion 342 is slidable according to the width of the workpiece 20.

5. Next, the continuous conveyance unit 400, the conveyance jig 30, and the meshed portion 304 shown in FIG. 1 will be described. The following description regarding the continuous conveyance unit 400 and the meshed portion 304 includes a guided portion 300 where the conveyance jig 30 is guided at least by the power supply rail 201, and a free end portion from a base end portion on the guided portion 300 side. Can be widely applied to those having a connecting portion 330 that extends in the horizontal direction toward the head and a holding portion 340 that is connected to the free end of the connecting portion 330 and holds the workpiece 20 in a suspended state. That is, whether or not to employ the first to third rails 303 to 305 described above is arbitrary.

5.1. Continuous Conveying Unit As shown in FIG. 6, the continuous conveying unit 400 shown in FIG. 1 can include a chain 410 that is continuously driven and a plurality of toothed blocks 420 that are fixed to the chain 410. The continuous conveying means can be formed with a toothed belt in terms of function, but when used in a plating tank 200 having a length of 10 m or more, the reliability is poor in terms of strength and deflection. Therefore, in this embodiment, the chain 410 is adopted. However, since the chain 410 cannot secure the positional accuracy of the conveying jig 30 as will be described later, a plurality of toothed blocks 420 are fixed to the chain 410.

  The chain 410 and the toothed block 420 are shown in FIGS. FIG. 13A is a front view, and FIG. 13B is a back view. The chain 410 is connected to a plurality of inner links 411 supporting the two rollers 411B and 411B between the two inner plates 411A and 411A, and two adjacent inner links 411 are sandwiched by two outer plates 412A. A plurality of outer links 412. Each of the outer links 412 includes a fixing portion 412B for fixing the plurality of toothed blocks 420. A bolt hole 412C is formed in the fixing portion 412B, and the toothed block 420 is bolted.

  Next, the toothed block 420 will be described. The toothed block 420 is injection-molded with resin, for example, and has a large number of teeth 421 on its upper surface as shown in FIG. As shown in FIG. 14 which is an enlarged view of a portion B in FIG. 13A, the teeth 421 are arranged at a pitch P1. For example, if the teeth 421 having one pitch are defined as a first slope, a top face, a second slope, and a valley face, the widths W of the first slope, the top face, the second slope, and the valley face are equal, as shown in FIG. , W = P1 / 4.

  One toothed block 420 has, for example, a line-symmetric shape, and the teeth 421 at both ends end with slopes. At this time, the length BL of one toothed block 420 is K × P1−P1 / 4, where K is the number of teeth. For example, if K = 19 and P1 = 4 mm, BL = 75 mm. In the present embodiment, as shown in FIG. 13A, the gap between two adjacent toothed blocks 420 is set to P1 / 4, and this gap is two teeth at the opposite end of each block 420. It functions as a valley surface of 421. Thus, the teeth 421 formed on the plurality of toothed blocks 420 fixed to the chain 410 are maintained at a constant pitch P1 between the blocks 420 in the linear traveling portion of the chain 410.

  The arrangement pitch P2 of the two rollers 411B of the chain 410 shown in FIG. 13B is larger than the arrangement pitch P1 of the teeth 421 on the toothed block 420 shown in FIG. 13A (P2> P1). As described above, since the position accuracy of the conveying jig 30 cannot be ensured only by the chain 410, the toothed block 420 on which the small pitch teeth 421 are formed is fixed to the chain 410.

  The pitch P1 of the teeth 421 of the toothed book 420 needs to be determined in consideration of the relationship with the design value interval (gap) G between two adjacent workpieces 20 in the plating tank 200 as shown in FIG. is there. As described above, if the gap G is large, the plating thickness at both ends of the workpiece 20 becomes thick, and the in-plane uniformity cannot be ensured. For that purpose, the positional accuracy of the workpiece 20 in the plating tank 200, that is, the conveyance is achieved. This is because the positional accuracy of the jig 30 needs to be increased.

  In order to increase the positional accuracy of the conveying jig 30, the pitch P1 of the teeth 421 may be reduced. However, in terms of the relationship with the gap G of the workpiece 20, it is preferable to satisfy P1 <G / 2. Even if the preceding conveyance jig 30 is shifted by one pitch rearward and the subsequent conveyance jig 30 is shifted by one pitch forward, G-2 × P1> 0 is satisfied, and adjacent conveyance jigs 30 collide with each other. Because there is nothing to do. That is, regardless of the preceding or following, the conveyance jig 30 is allowed to be displaced by ± 1 pitch P1. The lower limit of the pitch P1 is preferably P1 ≧ G / 3 from the viewpoint of securing the strength of the teeth 421. In this embodiment, G = 10 mm, P1 = 4 mm, and G / 3 ≦ <P1 <G / 2 is satisfied.

5.2. Engaged portions The engaged portions 304 arranged at two locations shown in FIG. 1 are engaged with any toothed block 420 fixed to the chain 410 (N is an integer of 2 or more), for example, 4 Claw members 304A1 to 304A4.

  These four claw members 304A1 to 304A4 are shown in FIG. In FIG. 15, the two claw members 304 </ b> A <b> 1 and 304 </ b> A <b> 2 are supported by a first shaft 312 </ b> A that is fixed to the guided portion 300 of the transport jig 30. The other two claw members 304A3 and 304A4 are rotatably supported by the second shaft 312B fixed to the guided portion 300 of the conveying jig 30. First and second stopper pins 313A and 314A are arranged above and below the claw members 304A1 and 304A2 with a gap therebetween. Similarly, first and second stopper pins 313B and 314B are arranged above and below the claw members 304A3 and 304A4 with a gap therebetween.

  In this way, when the four claw members 304A1 to 304A4 mesh with the teeth 421 formed on the toothed block 420, a range of relief portions (first and second stoppers) that can get over the crests and troughs of the teeth 421. Can move up and down (between pins). The four claw members 304A1 to 304A4 are formed by the lower pusher 270 shown in FIG. 2 when the conveying jig 30 is fed and moved at a speed faster than the moving speed of the chain 410. Advancing over the mountain and valley.

  Then, at the forward stroke end position of the lower pusher 270 shown in FIG. It meshes with the formed tooth 421. Therefore, after that, the conveyance jig 30 is conveyed by the driving force of the chain 410.

  In order to mesh any one of the four claw members 304A1 to 304A4 with the teeth 421 of the toothed block 420, the meshing tip positions of the four claw members 304A1 to 304A4 are shifted as shown in FIG.

  FIG. 15 illustrates one of the four claw members 304A1 to 304A4 engaged with the tooth 421 of the toothed block 420, and the other three claw members in the same posture as the meshed claw member. In the present embodiment, the engagement tip positions of the four claw members 304A1 to 304A4 are shifted back and forth by P1 / 4 with respect to the teeth 421 of the toothed block 420. For this reason, the engaging tip positions of the two coaxial claw members 304A1 and 304A2 are shifted rearwardly by P1 / 4 with respect to the claw member 304A1 which is the head in the transport direction A. Similarly, the engaging tip positions of the other two claw members 304A3 and 304A4 on the same axis are shifted rearward by P1 / 4 with respect to the claw member 304A3 which is the head in the transport direction A.

  The interval between the engagement tip positions of the claw members 304A2 and 304A3 is set to S × P1 + P1 / 4 where S is an integer of 2 or more. Thus, the meshing tip positions of the four claw members 304A1 to 304A4 are shifted back and forth by P1 / 4 with respect to the teeth 421 of the toothed block 420.

  Here, a comparative example in which only one claw member 304A1 is arranged on the conveying jig 30 or a plurality of claw members 304A1 are arranged at an integer multiple of the tooth pitch P1 is assumed. As described above, the claw member 304A1 may not be engaged with the teeth 421 at the moment when the conveying jig 30 stops receiving the external force from the lower pusher 270 at the forward stroke end position of the lower pusher 270 shown in FIG. is there. In this case, the claw member 304A1 meshes with one of the teeth 421 while the toothed block 420 moved by the chain 410 moves a maximum of one pitch P1. Therefore, the allowable deviation amount is 1 pitch P1.

  In the present embodiment, the claw member 304A1 does not mesh with the teeth 421 at the moment when the conveying jig 30 stops receiving the external force from the lower pusher 270 at the forward stroke end position of the lower pusher 270 shown in FIG. The toothed block 420 moved by the chain 410 may be moved by P1 / 4 until it meshes with any of the four claw members 304A1 to 304A4 shifted by P1 / 4 pitch. Therefore, the allowable deviation amount is reduced to P1 / 4.

  As described above, when P1 <G / 2 is satisfied, the conveyance jig 30 is allowed to be displaced by ± 1 pitch P1 regardless of whether it is preceding or following. However, the positional accuracy of the conveying jig 30 depends on the variation in the forward stroke of the lower pusher 270 shown in FIG. 2, the moving speed, and the mounting dimension system of various members. Accordingly, the feeding position of the conveying jig 30 by the lower pusher 270 varies between various plating apparatuses, and the error of the stopping position of the conveying jig overlaps with the engagement position error of the claw member, as shown in FIG. A gap G between the workpieces must be ensured.

  In the present embodiment, the gap G between the workpieces shown in FIG. 2 is always maintained by reducing the condition of P1 <G / 2 and the allowable deviation amount of the claw member to P1 / N (N is an integer of 2 or more). It is set within 10 mm and prevents collision between the front and rear workpieces 20.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. All combinations of the present embodiment and the modified examples are also included in the scope of the present invention.

  20 Workpiece, 30 Conveying jig, 200 Surface treatment tank (plating tank), 201 Power supply rail, 201A Upper surface, 201B Lower surface, 201C First side surface, 201D Second side surface, 300 Guided portion, 301 Powered portion, 301B Support plate , 302 1st roller, 303 2nd roller, 304 engaged part, 304A1 to 304A4 claw member, 305 3rd roller, 330 connecting part, 340 holding part, 400 continuous conveying means, 410 chain, 411 inner link, 411B roller, 412 outer link, 420 toothed block, 421 teeth, H1 first height position, H2 second height position, H3 upper end face height of connecting part, H4 lower end face height of connecting part, T connecting part thickness , P1 tooth pitch, P2 chain roller pitch, p1 transport tip side position, p2 3rd b Ra position, p3 second intermediate position, p4 first intermediate position, p5 third intermediate position, p6 third roller position, p7 conveying rear end position

Claims (8)

A surface treatment tank;
At a position deviated from above the surface treatment tank, a power supply rail extended by joining a plurality of rails in parallel with the longitudinal direction of the surface treatment tank,
A plurality of transfer jigs that are arranged in the surface treatment tank to hold the workpieces and are supported by the power supply rails,
Continuous conveying means for continuously conveying the plurality of conveying jigs along the power supply rail;
Have
The power supply rail includes, in a longitudinal section, an upper surface, a lower surface, a first side surface on the surface treatment tank side, and a second side surface facing the first side surface,
Each of the plurality of transport jigs is
A guided portion guided by the power supply rail;
A connecting portion extending in the horizontal direction from the base end portion on the guided portion side toward the free end portion;
Connected to the free end of the connecting part, and a holding part for holding the workpiece in a suspended state;
Have
The guided portion is
A power-supplied portion in contact with the upper surface of the power supply rail;
At least one first roller in rolling contact with the first side surface of the power supply rail;
At least one second roller in rolling contact with the second side surface of the power supply rail;
A meshed portion meshed with the continuous conveying means;
Have
Wherein at least a first height one first roller rolling contact with the first side surface position, rather lower than the second height position where the at least one second roller is rolling contact with the second side surface,
Any one of the at least one second roller and the at least one first roller includes a conveyance front end side position, a conveyance rear end side position, the conveyance front end side position, and the conveyance rear end side of the guided portion. A total of three rollers, one each at a first intermediate position between the positions,
The other of the at least one second roller and the at least one first roller includes a second intermediate position between the transport tip side position and the first intermediate position, the first intermediate position, and the transport. A surface treatment apparatus comprising a total of two rollers, one each at a third intermediate position between the rear end side position . In claim 1,
The surface treatment apparatus, wherein the at least one first roller is in rolling contact with a lower end portion of the first side surface, and the at least one second roller is in contact with an upper end portion of the second side surface. In claim 1 or 2,
The connecting portion has a thickness in a vertical direction between an upper end surface and a lower end surface, and the height of the upper end surface of the connecting portion and a height position of the lower end surface are at least one. A surface treatment apparatus comprising the second height position of two second rollers. In claim 3,
The surface treatment apparatus according to claim 1, wherein the first height position of the at least one first roller is positioned below a height position of the lower end surface of the connecting portion. In any one of Claims 1 thru | or 4,
Each of the plurality of conveying jigs further includes at least two third rollers that are in rolling contact with the lower surface of the power supply rail,
The surface treatment apparatus according to claim 1, wherein the at least two third rollers are provided on a conveyance front end side with respect to the second intermediate position and on a conveyance rear end side with respect to the third intermediate position . In any one of Claims 1 thru | or 5,
The guided portion has a support plate that supports the at least one first roller, and the support plate is adjustable in a horizontal direction perpendicular to the power supply rail with respect to the guided portion. A featured surface treatment apparatus. A surface treatment tank;
At a position deviated from above the surface treatment tank, a power supply rail extending in parallel with the longitudinal direction of the surface treatment tank,
A plurality of transfer jigs that are arranged in the surface treatment tank to hold the workpieces and are supported by the power supply rails,
Continuous conveying means for continuously conveying the plurality of conveying jigs along the power supply rail;
Have
The power supply rail includes, in a longitudinal section, an upper surface, a lower surface, a first side surface on the surface treatment tank side, and a second side surface facing the first side surface,
Each of the plurality of transport jigs is
A guided portion guided by the power supply rail;
A connecting portion extending in the horizontal direction from the base end portion on the guided portion side toward the free end portion;
Connected to the free end of the connecting part, and a holding part for holding the workpiece in a suspended state;
Have
The guided portion is
A power-supplied portion in contact with the upper surface of the power supply rail;
At least one first roller in rolling contact with the first side surface of the power supply rail;
At least one second roller in rolling contact with the second side surface of the power supply rail;
A meshed portion meshed with the continuous conveying means;
Have
The first height position where the at least one first roller is in rolling contact with the first side surface is lower than the second height position where the at least one second roller is in rolling contact with the second side surface,
Wherein each of the plurality of conveying jig further have at least one third roller rolling contact with the lower surface of the power feed rail,
The at least one third roller is movably supported at a first position where it is in rolling contact with the lower surface of the power supply rail and a second position where it is detached from the lower surface of the power supply rail. Surface treatment equipment. In claim 7 ,
The guided portion includes an urging member that urges the at least one third roller toward the first position, and the at least one third roller against the urging force of the urging member. A surface treatment apparatus comprising: a stopper that holds the second position.

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