Patent Publication Number: US-6904670-B2

Title: Frame jig for a connector

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a frame jig for a connector, and particularly to a jig that enables confirmation of the kinds of electric wires to be inserted into a number of cavities of the connector during the assembly of a wire harness. 
     2. Description of Background Information 
     A wire harness used for connection of various electrical equipment mounted on an automobile and the like is constructed by bundling many electric wires, and a connector for connection is installed at the terminal end of the wires. The installation of the connector is carried out in the assembly of the wire harness on an assembly diagram board on which a large number of various jigs and the like for wiring electric wires are provided. 
       FIG. 10  shows a conventional condition of installing the terminals of electric wires on a connector C, and the electric wires D are installed in turn in the connector C retained in recess of the holder  1   a  of the frame jig  1  which is provided to protrude from the assembly diagram board Z. Since the connection partner for each of the electric wires D constituting the wire harness is prescribed for each electric wire, the coatings of the electric wires D are colored and marks and the like are added in order to discriminate between the electric wires D. 
     The coatings of ends of the electric wires D are removed, the core wires Da are exposed, male or female terminals T are installed, and the electric wires D are installed in the connector C by inserting the terminals T into a respective one of the cavities Ca which are provided in the rear of the connector C and hooked therein. 
     Since the connection partner for each of the electric wires is also prescribed for the installation into the cavities Ca, the objective cavities Ca into which the terminals T of the electric wires D are to be inserted are also designated, and the designation is usually described in an arrangement drawing of a work instruction during the installation of a connector. A worker installs the designated electric wires D in the cavities Ca at the designated points in accordance with the designation content of the arrangement drawing. 
     Further, the installation of the electric wires D is usually carried out in both a pre-step called a “first-in” and a post-step called “last-out” in the assembly steps of the wire harness. A group of electric wires are installed in several of the cavities in the first-in step, then another group of electric wires are installed in the remaining cavities in the last-out step, and all groups of electric wires constituting the wire harness are installed in the connector. 
     The installation of the electric wires is carried out based on the arrangement drawing as described above, but there is a problem that an installation error of the electric wires caused by a mistake in the arrangement drawing and the like occurs. Namely, a worker must select the required electric wire from many electric wires by confirming the arrangement drawing, and further, the selected electric wires that are to be inserted into the cavities at the required position selected from many cavities must be made by again confirming the arrangement drawing. A mistake in the arrangement drawing, or of reading the arrangement drawing, and the like are easy to occur, and the burden required for confirmation by the worker is great. 
     Further, since the worker repeats the above-mentioned working order and assembles the wire harness in mass production, a mistake in reading the arrangement drawing and the like are apt to increase in accordance with the fatigue of the worker. Further, when a new arrangement drawing is introduced, or when a new worker engages in the assembly, and the like, there is a likelihood that a mistake in selection of installation points will occur. Further, it is required that the electric wires inserted by mistake as described above be inserted in the proper cavities. This requires removing the terminals from the cavities. There is the danger that the removal of the terminals may cause deformation of the terminals and damage to the connector. Further, it takes time and trouble to confirm the arrangement drawing as described, and thus there is the problem that working efficiency is also reduced. 
     SUMMARY OF THE INVENTION 
     The present invention was achieved in consideration of the above-mentioned problems, and an object is to make it easy to confirm the required electric wires to be installed and the required cavity positions of the connector, to reduce mistakes in the insertion of the electric wires, and to make the installation of the electric wires more efficient. 
     In order to solve the above-mentioned problems, the present invention provides a frame jig for a connector that is mounted to the upper surface of the assembly diagram board or wiring board for assembling a wire harness. The frame jig retains a connector, installed with terminals of electric wires wired on the assembly diagram board, by a recess provided on the upper face of a holder. The holder has a construction such that the same kinds of sample electric wires as the electric wires inserted in respective cavities of the connector are installed at locations which confront the respective cavities of the connector which are retained by a peripheral rim of the recess. 
     Thus, when the same kinds of electric wires as the wires to be installed on the connector are installed on the holder of the frame jig as the sample electric wires, the electric wires to be installed can be determined at a glance by observing the sample electric wires. Therefore, the requisite electric wires can be selected from a large number of electric wires without confirming by the arrangement drawing or wiring diagram. Further, since the sample electric wires are installed at the peripheral rim at the locations which confront the respective cavities of the connector retained by the recess of the holder, the insertion locations of cavities can be discriminated without confirming the arrangement drawing. 
     Accordingly, the insertion work of a connector is carried out by selecting the kinds of electric wires that coincide with the kinds and installation locations of the sample electric wires installed on the holder, and then insert the electric wires into the cavities at the corresponding locations. Accordingly, confirmation of the arrangement drawing becomes unnecessary and the efficiency of the installation work can be improved. Further, since the kinds and installation locations of the sample electric wires are also clear as compared with a conventional description in the arrangement drawing, the occurrence of mistakes in inserting electric wires can be reduced. Further, the same kinds of the sample electric wires as the electric wires to be installed in the connector are installed on the holder, therefore the degree of mastery by a worker for start-up production of a new machine is speeded up, and guidance and the like of a new worker is easily carried out. 
     According to one aspect of the present invention, apertures are provided in the peripheral rim of the holder at every location that confronts a respective cavity of the connector. Recesses are provided on the side faces of the holder at the sides where the apertures are provided, and one end of the sample electric wires is inserted into the apertures and the other ends of the sample electric wires are inserted into recesses in side surfaces of the holder. Locking members, formed as separate bodies, are positioned in the side recesses, and the sample electric wires are installed in a condition for easy installation and removal. 
     Thus, when the apertures are provided in the upper surface of holder and the side recesses are provided in the side faces, replacement of the sample electric wires can be easily carried out. Accordingly, when the connector to be installed with electric wires is changed, or even when the cavities in which the electric wires are to be installed are changed, the changes can be easily accomplished by removing the sample electric wires and installing the requisite kinds of sample electric wires into the corresponding apertures and side recesses. 
     Further, the frame jig for a connector of the present invention can be suitably used in either of the first-in step and the last-in step. Namely, when only the sample electric wires corresponding to the first-in electric wires are installed in the corresponding locations in the first-in step, the first-in installation work can be easily carried out based on the sample electric wires. Similarly, when only the sample electric wires corresponding to the last-in electric wires are installed in the corresponding locations in the last-in step, the last-in installation work can be easily carried out based on the sample electric wires. Further, the locking members are formed as a separate body, and may be formed of any suitable material, such as a resin, a rubber and the like, so as to have the same cross-sectional area as the size of the side recesses of the holder. Thus, when the locking members are fitted into the side recesses, the contacting areas of the sample electric wires are bent and the ends of the sample electric wires are retained. 
     In another aspect of the present invention, the sample electric wires may be fixed by providing electric wire grooves in the peripheral rim in parallel at every location that confronts the respective cavities of the connector, by fitting the sample electric wires in the electric wire grooves, and by mounting and fixing a transparent panel on the peripheral rim on which the electric wire grooves are provided. Thus, the sample electric wires can also be fixed by the electric wire grooves and the transparent panel. Namely, since the electric wire grooves are provided at locations which confront with the respective cavity positions of the connector retained in the recess, the kinds and positions of the respective electric wires can be easily confirmed through the transparent panel by fixing the sample electric wires when the transparent panel is mounted after fitting the same kinds of sample electric wires as the electric wires to be inserted in the cavities at positions confronted by the respective electric wire grooves. 
     In a further aspect of the present invention, the side recesses are provided at a distance from the upper end of the holder side faces, parallel grooves that extend upwardly and downwardly are provided to communicate with the side recesses at every location which confronts the apertures from the upper end of the holder side faces to the side recesses, and the sample electric wires are arranged in parallel while lying in the grooves. As described above, when the grooves are provided to extend from the upper end of the holder side faces to the side recesses, the respective sample electric wires are installed in parallel by fitting into the grooves the sample electric wires having ends that are inserted in the apertures. Accordingly, the positions of cavities corresponding to the sample electric wires are further made clear, and the confirmation can be easily carried out. Additionally, since the sample electric wires can be also confirmed from the holder side, improvement of the confirmation property can be also designed for various working positions. 
     According to another aspect of the present invention, moving members are installed on the holder so as to be able to approach and withdraw from the peripheral rim on which the sample electric wires are provided. The upper openings of the respective cavities not required to have the electric wires inserted are blocked in the approaching position of the moving members. Masking bars having a length that allows covering and uncovering of the upper opening of the recess protrude from the moving members. 
     As described above, when the moving members from which the masking bars protrude are installed on the holder, the cavities where electric wires of the connector are not required to be inserted are blocked by the masking bars when the moving members approach to the holder at insertion of the electric wires. Therefore, the insertion of the electric wires into the blocked cavities becomes physically impossible, and the insertion errors of the electric wires can be positively prevented. Further, since the masking bars are positioned at the locations corresponding to the cavities which are not required to have wires inserted, the sample electric wires which were installed on the peripheral rim of the holder are not interrupted, and a problem in confirmation of the kinds of electric wires to be inserted does not occur. Further, when the moving members move away from the recess of the holder, the masking bars retreat from the recess of the holder, and the opening of the recess is uncovered. Therefore, the installation and removal of the connector in the recess can be reasonably carried out. Further, the locations of the protruding masking bars can be appropriately changed in accordance with the connector in which the wires are to be installed. 
    
    
     
       BRIEF DESCRIPTION OF DRAWING 
         FIG. 1  is a perspective view of the frame jig for a connector according to the present invention. 
         FIG. 2  is a perspective view of the holder of the frame jig for a connector. 
         FIG. 3  is a perspective view showing the installation of electric wires on the holder. 
         FIG. 4  is an exploded perspective view of the frame jig for a connector according to a second embodiment of the present invention. 
         FIG. 5  is a perspective view of the frame jig for a connector according to the second embodiment. 
         FIG. 6  is a perspective view of the frame jig for a connector according to a third embodiment of the present invention. 
         FIG. 7  is a perspective view of the holder according to the third embodiment. 
       FIGS.  8 (A) and  8 (B) are a plan view and a front view, respectively, of an approaching position of the moving member. 
       FIGS.  9 (A) and  9 (B) are a plan view and a front view, respectively, of returning position of the moving member. 
         FIG. 10  is a perspective view of a conventional frame jig for a connector. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE PRESENT INVENTION 
     The mode of operation of the present invention is illustrated referring to drawings below. 
       FIG. 1  shows a frame jig  10  for a connector C in accordance with a first embodiment of the present invention. A holder  11  is provided on the upper end  15   a  of a supporting column  15  which is provided to extend upwardly from the assembly diagram board Z. The holder  11  also includes various sample electric wires S that are the same as the electric wires D to be inserted in the connector C. 
     As shown in  FIG. 2 , the holder  11  includes a recess  11   b,  for retaining a block-shaped connector, at the upper face  11   a  of the holder  11 . Further, a number of apertures  11   d  in which first ends of the sample electric wires S are inserted are provided at the periphery  11   c  of the recess  11   b.  In the present embodiment, the connector C which is to be assembled is a connector having two sets of cavities Ca, and each of the apertures  11   d  is provided along the side of the recess  11   b  at every point adjacent to the respective cavities Ca in a condition in which the connector C is retained in the recess. Further, the diameter of the apertures adjacent the recess  11   b  is established considering the electric wire diameter of the sample electric wires S, so that the electric wires S to be inserted are not easily removed. 
     Further, side recesses  11   g  are provided on the side faces  11   e,    11   f  (only one side recess being shown in  FIG. 3 ) which are situated in a direction at which the apertures  11   d  are provided, respectively. The side recesses  11   g  are spaced from the upper ends  11   h,    11   i  of the side faces  11   e,    11   f,  and have long rectangular openings having a slightly narrower length dimension than the length of the holder  11 . Further, parallel grooves  11   j  are formed between the upper ends  11   h,    11   i  of the side faces  11   e,    11   f  and the side recesses  11   g.  These grooves  11   j  have the same width as the electric wire diameter of the sample electric wires S so as to be able to receive the sample electric wires S, and the intervals between the respective grooves  11   j  are equal and correspond to the intervals between the respective apertures  11   d  in the upper face  11   a.    
     Further, as shown in  FIG. 3 , the holder  11  receives locking members  12  inserted into the side recesses  11   g.  The locking members  12  are formed as separate bodies, and are formed of any suitable material such as a resin, a rubber and the like, having elasticity, flexibility and the like. The locking members  12  are preferably formed in a generally square bar shape having a slightly larger cross-section than the openings of the side recesses  11   g.  However, the locking members  12  may have any suitable shape. The locking members  12  are designed to be positively installed while being deformed and retained by pressing into the side recesses  11   g,  due to the use of a material having the above-mentioned properties. When the sample electric wires S are present, the sample electric wires S are designed to be able to be retained and locked by bending. 
     The frame jig  10  for a connector is further described below, exemplifying a case applied to the first-in step of the electric wires. 
     As shown in  FIG. 3 , firstly, the same kinds of sample electric wires S as the electric wires to be inserted at the first-in step are prepared, and these sample electric wires S are installed on the holder  11 . 
     As the sample electric wires S, wires are prepared having lengths sufficient to reach from the apertures  11   d  of the holder  11  to the side recesses  11   g,  and the same kinds of sample electric wires S are installed into the apertures  11   d  at positions which correspond to the cavities Ca of installed positions of the connector. During installation, one end Sa of each sample electric wire S is inserted into the respective aperture  11   d  and the side faces  11   e  ( 11   f ). The sample electric wires S are then bent downwardly at the upper ends  11   h  ( 11   i ) and conducted along the side faces  11   e  ( 11   f ) to be positioned in the grooves  11   j,  and the other ends Sb are bent to position the ends within the side recesses  11   g.  Similarly, other sample electric wires S corresponding to the apertures  11   d  are installed in turn thereafter. 
     Then, the locking members  12 , which are formed as separate bodies made, for example, of a resin, a rubber or the like, are pressed into the side recesses  11   g,  and the locking members  12  are appropriately deformed to retain the other ends of the sample electric wires S. Each of the sample electric wires S thus installed is arranged in parallel, and can be easily confirmed from both the upper face  11   a  and the side faces  11   e,    11   f.    
     The connector C is retained in the recess  11   b  of the frame jig  10  for a connector which is prepared as described above, the same kinds of electric wires D as the sample electric wires S are selected from a group of the first-in electric wires which form the wire harness as shown in FIG.  1 . The terminals T of the ends of the electric wires D are inserted in the cavities Ca confronting the installation points of corresponding sample electric wires S. Thereafter, similarly, the kinds of electric wires and the positions of cavities are confirmed by the sample electric wires S and installed in turn, and the installation work is carried out without confirmation of the arrangement drawing. 
     Further, when the connector and the positions of cavities where electric wires are to be inserted are changed, the locking members  12  are removed and exchanges of the appropriate kinds of sample electric wires S and the installation positions are performed. Additionally, in the last-in step, the same kinds of the electric wires as the last-in electric wires are installed in the apertures corresponding to the installation points, and the corresponding kinds of electric wires are then selected, without confirming the arrangement drawing as described above, and are inserted into the corresponding cavities. 
     Further, the frame jig for a connector of the present invention is not limited to the above mode of operation, and for example, when a connector to be installed is a type having one set of cavities, it is sufficient to install the sample electric wires in any one side of the recess of a holder. Further, when the shape of the holder and the like are limited, it is not always necessary to provide a groove on a side face. 
     FIG.  4  and  FIG. 5  depict a frame jig  20  for a connector according to a second embodiment of the present invention, in which a number of electric wire grooves  21   d  are provided in parallel at the peripheral rim  21   c  of the recess  21   b  which is provided on the upper face  21   a  of the holder  21 . Each of the respective electric wire grooves  21   d  extends from the vicinity of the recess  21   b  to the end edge  21   h  of the holder  21 , the width of the grooves is dimensioned to receive the sample electric wires S accommodated within the grooves, and the depth of the grooves is made slightly shallower than the outer diameter dimension of the sample electric wires S. The electric wire grooves  21   d  are provided at every position which confronts with a respective cavity of the connector retained at the recess  21   b,  and as a result, the respective electric wire grooves  21   d  are positioned in parallel and at the same pitch as the respective cavities. Further, screw holes  21   k  are provided at the four corners of the upper face  21   a  of the holder  21 . 
     Additionally, a transparent panel  23  for fixing the sample electric wires is configured to be fixed by screws on the upper face  21   a  of the holder  21 . At the center, the transparent panel  23  is provided with a rectangular connector transferring hole  23   a,  and the panel approximates the shape of the peripheral rim  21   c  of the upper face  21   a  of the holder  21 , and the panel is provided with the screw receiving holes  23   b  at the four corners thereof. 
     Each of the sample electric wires S installed on the holder  21  is cut to have length shorter than the electric wire grooves  21   d.  These sample electric wires S, which are the same kind of electric wires that are inserted in the respective cavities of the connector retained within the recess  21   b,  are positioned in the electric wire grooves  21   d,  and the electric wire grooves  21   d  are located at positions that confront the cavities where the same kind of electric wires as the sample electric wires S are inserted. The sample electric wires S protrude slightly from the electric wire grooves  21   d,  due to the relationship of the groove depth and the outer diameter dimension of the wires. 
     After all of the sample electric wires S are positioned in the corresponding grooves  21   d,  the transparent panel  23  is mounted on the upper face  21   a  of the holder  21 , and the four corners are fixed by being fastened with the screws  24 . At this time, since the sample electric wires S protrude from the electric wire grooves  21   d,  the lower face  23   c  of the transparent panel  23  is pressed against the electric wires S and the electric wires S are fixed by being sandwiched between the transparent panel and the bottom face of the electric wire grooves  21   d.  Since the sample electric wires S can be visually confirmed through the transparent board  23 , the connector of the concave part  21   b  is installed in a manner similar to the first embodiment. Thus, the same kinds of electric wires as the sample electric wires S are inserted in the cavities which confront the installation position of the sample electric wires S. 
     Further, since the sample electric wires S are covered with the transparent panel  23 , problems such as dropping-out caused by being hung during insertion or the like does not occur. Further, when the kinds of the inserted electric wires and the insertion kind are to be changed, the transparent panel  23  is removed by reversing the above-mentioned procedure, and the corresponding kinds of sample electric wires S are again positioned in the corresponding electric wire grooves  21   d.  In the frame jig  20  for a connector according to the second embodiment of the invention, when the connector being the installation object is a type having a single stage of cavities, the electric wire grooves are provided on only one side of the recess of the holder, and it is sufficient to install the sample electric wires on one side. 
       FIG. 6  depicts a frame jig  30  for a connector according to a third embodiment of the present invention, in which a first moving member  35  and a second moving member  36  are respectively mounted on the holder  31 . L-shaped supporting brackets  37  are used for mounting the frame jig  30  to the wiring board and are respectively installed on the side faces  31   e  at both ends of the longer sides  31   i  of the holder  31 . 
     As shown in  FIG. 7 , the holder  31  is provided with a projecting portion  31   m  which projects upwardly at a central position, and the projecting portion  31   m  has about the same configuration as the frame jig  20  for a connector according to the second embodiment. Namely, a recess  31   b  for retaining the connector is provided at the central part of the uppermost face  31   a,  and the electric wire grooves  31   d  are provided on the peripheral rim  31   c  of the recess  31   b,  in a manner similar to the second embodiment. Further, screw holes for fixing a transparent panel  33  in a manner similar to the transparent panel  22  of the second embodiment are provided at the four corners of the uppermost face  31   a.    
     Additionally, rails  31   s  that regulate the movement of first and second moving members  35 , 36  are provided to project from the upper faces  31   n  on opposite sides of the projecting portion  31   m  of the holder  31 . The upper part of the rails  31   s  is wider than the portion that protrudes from the upper faces  31   n,  and separation of the first and the second moving members  35 , 36  in the upward direction is prevented. Further, the holder  31  is provided with pin grooves  31   u  which extend from the lower surface of the holder  31  toward the projecting portion  31   m,  at the center of the side faces  31   t  on both sides of the long side  31   i,  respectively. 
     On the other hand, the first moving member  35  and second moving member  36  have a block shape, and are provided at the center of the bottom faces  35   a , 36   a  with rail grooves  35   b , 36   b  having a sectional shape corresponding with the sectional shape of the rails  31   s  of the holder  31 . Further, a number of bar holes  35   b , 36   b  are provided in one face  35   c  and one face  36   c  at the projecting portion  31   m  side of the holder  31 . These bar holes  35   d , 36   d  are provided at the same pitch corresponding to the respective cavities Ca of a connector C which is retained on the recess  31   b  of the projecting portion  31   m,  at a position above the transparent panel  33  when the transparent panel  33  is fixed to the projecting portion  31   m.    
     Masking bars  38  are installed in the bar holes  35   d , 36   d , and protrude from the first and the second moving members  35 , 36 . The masking bars  38  have an outer diameter sufficiently large to block the respective cavities Ca of the connector C, and the protruding length is set to a dimension in which the ends of the bars extend almost to the center of the projecting portion  31   m  (as shown in FIG.  8 A), at a position in which one face  35   c  and one face  36   c  of the first and the second moving members  35 , 36  contact the ends of the projecting portion  31   m.    
     Further, elongated bar-shaped link members  39   a  are mounted on the left and right side faces  35   e , 36   e  by pivot pins  40 , in a condition in which they can freely pivot. The first and the second moving members  35 , 36 , having the link members  39   a  thus installed, are installed on the holder  31  along the rails  31   s  in a condition in which they can freely slide by fitting the rail grooves  36   b , 36   b  with the rails  31   s  of the holder  31 . After installing thus, the ends  39   b  of the respective link members  39   a  are overlapped, and link pins  41  are installed at the ends  39   b . Protruding ends  41   a  (note  FIG. 8A ) of the link pins  41  are housed in the pin grooves  31   u  of the holder  31 , and links  39  are formed by the link members  39   a , the pivot pins  40  and the link pins  41 . 
     The first and second moving members  35 , 36  are thus configured to be linked and moved by the thus formed links  39 , and can be moved within a range from an approaching position relative to the peripheral rim  31   c  of the projecting portion  31  shown in FIGS.  8 (A),  8 (B), to a distal position shown in FIGS.  9 (A),  9 (B). The range of movement of the first and second moving members  35 , 36  permits the ends of the masking bars  38  to retreat from a position above and covering the recess  31   b  to the distal position so that the masking bars do not block the upper opening of the recess  31   b.    
     The insertion work of electric wires by the frame jig  30  for a connector will now be described. 
     First, as a stage of preparing the work in a manner similar to the second embodiment, sample electric wires S, which correspond with the cavities Ca of the connector C which is the objective of the work, are mounted in the electric wire grooves  31   d  of the projecting portion  31   m,  and are fixed therein by the transparent panel  33 . Then, the masking bars  38  are respectively installed in the bar holes  35   d , 36   d  at the ends of the first and the second moving members  35 , 36  at locations corresponding to the cavities Ca of the connector C which require no insertion of electric wires, and the preparation of the work is completed. 
     After completion of the preparation work, the first and the second moving members  35 , 36  are positioned in the distal position shown in FIGS.  9 (A),  9 (B). In the approaching position, since the cavities Ca requiring no insertion of wires are blocked by the masking bars  38  as shown in FIG.  8 (A), insertion of electric wires becomes physically impossible, and the electric wires cannot by mistakenly inserted in the blocked positions of the cavities. 
     Further, since the sample electric wires S that are not blocked by the respective masking bars  38  can be confirmed in this condition, the kinds of the electric wires D to be inserted can be easily determined in the same manner as in the first and second embodiments. Accordingly, since the insertion work may be easily carried out by marking the cavities Ca other than the locations which are blocked by the masking bars  38 , the insertion work can be carried out by concentrating on only the open cavities Ca, and the work efficiency is improved. Further, when the connector is to be removed after completion of the insertion work, the first and the second moving members  35 , 36  are returned to the distal position and the connector is removed without interference with the masking bars  38 . 
     Further, it is not required that the frame jig  30  for a connector always be provided with a pair of the moving members. For example, if the connector being the installation objective is a type having one stage of cavities, only one of the moving members is installed, the cavities not requiring insertion are blocked by the masking bars, and the kinds and positions of the inserted electric wires may be easily determined by the sample electric wires. 
     As is clear from the above description, when the frame jig for a connector of the present invention is used, the kinds of electric wires and the installation positions can be confirmed by the sample electric wires installed without looking to the arrangement drawing. Thus, the confirmation is easy, the burden required for confirmation by a worker can be reduced together with reduction of installation mistakes of the electric wires, and the installation work becomes more efficient. Further, the reduction of installation mistakes of electric wires reduces the trouble, time and the like required for correction of the mistakes, the amount of deformation of terminals during modification and damage to the connector is reduced, and the expenses corresponding to these defective products can be reduced. 
     Further, since sample electric wires installed on a holder can be easily installed and removed, a jobsite can flexibly respond to the occurrence of design change and the like. Further, since the sample electric wires can be confirmed at a glance, a worker can precisely grasp the working instruction, and can perform work with fewer mistakes. 
     Moreover, when the electric wire grooves are provided on the upper face of the holder and the sample electric wires are fixed in the electric wire grooves by the transparent panel, problems such as dropping-out caused by the hanging of the sample electric wires during the installation work and the like do not occur. Further, easy exchangeability of the sample electric wires is also provided, and usability can be further improved. Moreover, when the moving members having the protruding masking bars are installed on the holder, the kinds of electric wires to be inserted and the inserted locations designated by the sample electric wires are ensured, the insertion of electric wires to the cavities not requiring insertion is further made impossible by the masking bars, confirmation error of the positions of the inserted cavities can be positively prevented, and the rate of occurrence of problems at the start of production of a new machine and at the start of a new worker can be remarkably reduced. 
     Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein. Instead, the invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims. 
     The present disclosure relates to subject matter contained in priority Japanese Application Nos. JP 2000-164009, filed on Jun. 1, 2000, and JP 2001-40136, filed Feb. 16, 2001, which are herein expressly incorporated by reference in their entirety.