Abstract:
An electrically conductive belt conveyer through which objects transported can be conducted with electric power for electrical test during transportation. Conductive members are built inside the belt and formed a normally open circuit. As an object being placed on the belt, the object, the conductive members and a power supply form a closed circuit. The belt conveyer is less expensive than a conventional chain conveyor for electrical test.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The invention generally relates to a belt conveyer for transporting objects, and particularly relates to a belt conveyer on which at least an object can be conducted with electric power for electrical test during transportation.  
           [0003]    2. Related Art  
           [0004]    In order to save manpower of transporting objects in a workshop, some transportation apparatuses, such as elevators or conveyers, are generally applied.  
           [0005]    Conveyers are mainly of belt conveyers and chain conveyers. The cost of a belt conveyer is usually less than a chain conveyer. Since the belt is usually made of rubber, it is electrically insulative, while the chain is made of metal and is electrically conductive.  
           [0006]    As chain conveyers are electrically conductive, they are usually applied for transporting objects that require electrical inspection during transportation. The objects are manually set up and formed power loops with the chains for performing electrical tests of the objects. In order words, conventional electrical testing device based on conveyer are made with chain conveyers. However chain conveyers cost more. There are also some limitations for applying chain conveyers in object test: firstly, the work time for each object should be equal; secondly, the positioning lever for the electric power terminal should be adjusted individually if the objects are not placed in a same distance; and thirdly, different electric power terminals have to be prepared for different objects.  
           [0007]    In order to solve the aforesaid problems, the invention provides an electrically conductive belt conveyer through which objects transported can be tested with electric power. The belt conveyer is less expensive. Objects on the belt do not require a same work time of test or assembly. The electric power terminal does not require individual positioning adjustments for different distances of objects. And, a same power terminal can be applied for different objects.  
         SUMMARY OF THE INVENTION  
         [0008]    The primary objective of the invention is to provide an electrically conductive belt conveyer that is less expensive.  
           [0009]    The secondary objective of the invention is to provide an electrically conductive belt conveyer that is replaceable from conventional belt and costs less.  
           [0010]    Another objective of the invention is to provide an electrically conductive belt conveyer that does not need adjustment of positioning of power terminals when distance between objects is changed.  
           [0011]    Yet another objective of the invention is to provide an electrically conductive belt conveyer that does not need changing of power terminal when handling different kinds of object.  
           [0012]    An electrically conductive belt conveyer according to the invention includes a roller platform and a belt. The roller platform includes a supporting frame and two rollers mounted on two ends of the supporting frame. The belt surrounds the two rollers for rotation and transporting objects placed thereon. Power conductive members are built inside the belt and formed a normally open circuit. As an object being placed on the belt, the object, the conductive members and a power supply form a closed circuit so that the object is tested with electric power. The electrically conductive belt conveyer of the invention is capable of performing electrical test of object with less cost. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0013]    The invention will become more fully understood from the detailed description given hereinbelow. However, this description is for purposes of illustration only, and thus is not limitative of the invention, wherein:  
         [0014]    [0014]FIG. 1 is a sectional view of an electrically conductive belt conveyer of the invention;  
         [0015]    [0015]FIG. 2 is a sectional view of a belt in an embodiment of the invention; and  
         [0016]    [0016]FIG. 3 is a detailed sectional view of conductive members in an embodiment of the invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0017]    As shown in FIGS. 1, 2 and  3 , an electrically conductive belt conveyer according to the invention includes a roller platform  1  and a belt  2 . The roller platform  1  includes a supporting frame  11  and two rollers  12   a ,  12   b . The supporting frame  11  supports the roller platform  1 , the belt  2  and other components. The rollers  12   a ,  12   b  are mounted on two ends of the supporting frame  11  and driven by a driver (not shown in the drawings).  
         [0018]    The belt  2  surrounds the rollers  12   a  and  12   b . There are conductive members  21  formed on the belt  2 . The conductive members  21  connect to an unshown power supply so that an electric power circuit is formed when an object is placed on the belt  2  and connected to a conductive member, and the electrical function of the object is tested under power supply. The electric power circuit is open when there is no object placed on the belt  2 .  
         [0019]    The conductive members  21 , as shown in FIGS. 2 and 3, include at least a detachable power terminal  211 , a belt layer  212 , a conductive layer  213  and conductive wheels  214   a ,  214   b . The power terminal  211  is removably attached to the belt  2 . Each power terminal  211  is formed with two openings  2111   a ,  2111   b  spaced apart for receiving power plugs of an object. Two conductive plates  2112   a ,  2112   b  are fixed to the openings  2111   a ,  2111   b  respectively for electric connection with the object and conductively touch the conductive layer  213  of the belt  2 . A fastener  2113  is formed between the power terminal  211  and the conductive layer  213 . The fastener  2113 , for example, includes a magnet  2113   a  and a ferric plate  2113   b  fixed to the power terminal  211  and the conductive layer  213  respectively so that the power terminal  211  can be fastened to the belt  2  by a magnetic force.  
         [0020]    The belt layer  212  of the belt  2  is formed with through holes  2121   a ,  2121   b  and  2122  for the conductive plates  2112   a ,  2112   b  and the magnet  2113   a  passing through. The conductive layer  213  includes two conductive strips  2131   a ,  2131   b  for transferring electric power to the conductive plates  211   a ,  211   b . The power source for the power terminal  211  is conducted from the conductive wheels  214   a ,  214   b , via the conductive strips  2131   a ,  2131   b , to the conductive plates  2112   a ,  2112   b , and finally provided to the object plugged in the openings  2111   a ,  2111   b.    
         [0021]    As a result, when objects  3  being transferred by the belt conveyer in which the belt  2  is moving along the platform  1  and the rollers  12   a ,  12   b , electric power is provided to the objects via the power terminals  211  attached to the belt  2 . Therefore, the objects can be tested with electric power. By means of the belt conveyor, the cost of testing electrical function of objects is much inexpensive than that with conventional chain conveyers.  
         [0022]    The electrically conductive belt conveyer of the invention has the following advantages:  
         [0023]    1) The belt conveyor for testing electrical function of objects during transportation is much inexpensive than conventional devices, usually only one fifth of a chain conveyer.  
         [0024]    2) The conventional belt conveyer can be replaced with a belt of the invention for performing electrical test so as to save cost of the device.  
         [0025]    3) The belt conveyer is not limited to the following shortages of chain conveyers: the work time for each object should be equal; the positioning lever for the electric power terminal should be adjusted individually if the objects are not in a same distance; and different electric power terminals have to be prepared for different objects.  
         [0026]    4) The power terminal in the invention can be easily modified for testing different objects.  
         [0027]    5) There is a high flexibility that the invention can be applied to only a portion of a production line, and can be easily rearranged for different portions of the line.  
         [0028]    6) The invention is applicable to the whole production line or only a part of the line.  
         [0029]    The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.