Patent Publication Number: US-2007094859-A1

Title: Manufacturing system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
      This application claims the benefit under 35 U.S.C. § 119(a) of Korean Patent Application No. 2005-0102990, filed on Oct. 31, 2005, in the Korean Intellectual Property Office, the entire disclosure of which is hereby incorporated by reference.  
     BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to a manufacturing system. More particularly, the present invention relates to a manufacturing system which comprises an assembly unit, a test unit and a packaging unit for products.  
      2. Description of the Related Art  
      Generally, products are manufactured through various processes before being supplied to a customer. A manufacturing system typically comprises a component manufacturing process, an assembly process which assembles components, a test process for an assembled product, and a packaging process in which the products are packaged.  
      Here, the product may comprise electronic appliances including a computer, a video or an audio player and machines.  
      Hereinafter, a monitor device manufacturing system as a type of display apparatus will be described as an example of the present invention.  
      Accordingly, as a life cycle of a monitor device becomes shorter, an existing manufacturing system which manufactures a small range of products in volume is replaced with a manufacturing system which manufactures various products in a small volume to satisfy various demands of customers. Also, a new manufacturing system which provides improved work efficiency with a small work force is required to properly cope with increase and decrease of production. Recently, customers tend to prefer a thin display panel such as a liquid crystal display (LCD) and a plasma display monitor (PDP) among various monitor devices.  
      The conventional monitor device manufacturing system comprises a straight-lined conveyor system. In the straight-lined conveyor system, a plurality of workers assembles respective components to a monitor device which is moved along the conveyor system that is arranged in a straight line. Generally, the conventional monitor device manufacturing system comprises a moving unit on which the monitor device is assembled and moved; and a vehicle and a component storage through which components to be assembled are moved and stored. The test process is provided to test the monitor device in various methods or adjust the monitor device to a predetermined state. While moving or stopping the monitor device on the conveyor line, the monitor device is tested to find malfunction during the test process. A pallet is generally used to support the monitor device in the test process. Then, the monitor device which has passed the test process is packaged.  
      In the conventional monitor device manufacturing system, the vehicle and the storage should be provided separately to assemble components on a worktable or a conveyor line. Accordingly, the length of an assembly unit becomes longer, thereby taking much space due to the keeping table and the worktable, and widening a working radius of a worker. Also, it is difficult to use the space efficiently. Further, since the conventional manufacturing system is arranged in a straight line or in a  -shaped line to perform various tests in the test process, the space efficiency becomes lowered and its configuration becomes complicated for power and signal supplying. Furthermore, the monitor device may be affected by vibrations, noises and shocks due to a long moving line.  
      Accordingly, there is a need for an improved manufacturing system for providing efficient space that is not affected by vibrations, noises and shocks.  
     SUMMARY OF THE INVENTION  
      An aspect of exemplary embodiments of the present invention is to address at least the above problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of exemplary embodiments of the present invention is to provide a manufacturing system which improves productivity with a small work space and work force coping with an increase and decrease of production, and a variety of products.  
      Also, it is another aspect of exemplary embodiments of the present invention to provide a manufacturing system in which a moving unit such as a conveyor is reduced, a pallet supporting a product is removed, which is less affected by vibrations or shocks caused when moving the product.  
      Additional aspects and/or advantages of exemplary embodiments of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present invention.  
      The foregoing and/or other aspects of exemplary embodiments of the present invention are also achieved by providing a manufacturing system comprising an assembly unit for assembling components of a product, a test unit for testing the assembled product and a packaging unit for packing the product that has passed the test unit. The assembly unit comprises a moving unit for moving the product, a worktable adjacent to the moving unit and on which the components of the product are assembled, first and second auxiliary worktables comprising a plurality of accommodators in which the components of the product are seated to be assembled to the product and a caster movably provided on a lower part thereof, and a rotator detachably provided to rotate at least one of the first and second auxiliary worktables corresponding to the other within a predetermined angle, the test unit comprising a rotation table which is shaped like a round plate for rotating, a base for supporting the rotation table, a driving unit provided on the base and supplies a driving force to rotate the rotation table, and a plurality of jigs disposed on the rotation table at a predetermined interval and support the product so that the rotation table rotates and forms a work station for a predetermined test.  
      In an exemplary implementation, the rotator comprises a plurality of projections which protrude from at least one of the first and second auxiliary worktables toward the other; and a plurality of projection accommodators provided on at least one of the first and second auxiliary worktables to be engaged with the projections.  
      In an exemplary implementation, the worktable and the first and second auxiliary worktables are disposed in a zigzag pattern, and the moving part is comprised therebetween.  
      In an exemplary implementation, the worktable comprises a rotating assembly table rotatably provided at a predetermined height and on which the components of the product are assembled.  
      In an exemplary implementation, the jigs comprise a fixing supporter which supports a first side of the product, a moving supporter which supports a second side of the product and moves in a lateral direction according to the size of the product, and an arm which is coupled with the rotation table and supports the fixing supporter and the moving supporter to rotate to a predetermined angle.  
      In an exemplary implementation, the arm comprises a speed controller for controlling the speed of the fixing supporter and the moving supporter.  
      In an exemplary implementation, the fixing supporter and the moving supporter each comprise an inclination member which is inclined to a predetermined angle, a bending member which is bent from a lower end of the inclination member, and a shock-absorbing member respectively attached to the inclination member and the bending member which provides contact with the product.  
      In an exemplary implementation, the shock-absorbing member comprises urethane.  
      In an exemplary implementation, the jigs comprise a pattern generator for supplying a predetermined signal to the product.  
      In an exemplary implementation, a signal is wirelessly transmitted in the pattern generator.  
      In an exemplary implementation, the manufacturing system further comprises a fixing table provided on a center area of the rotation table and coupled with the base, and a power supply electrically connected with the fixing table and the rotation table for supplying power or transmitting data therebetween.  
      In an exemplary implementation, the manufacturing system further comprises an operation table, provided below the rotation table, to be spaced therefrom and coupled with the base.  
      In an exemplary implementation, the manufacturing system further comprises a path which is detachably provided on a portion of the operation table for providing a user with access to a center area of the operation table.  
      In an exemplary implementation, the operation table comprises a medium density fiber board (MDF).  
      In an exemplary implementation, the manufacturing system further comprises an elastic radio frequency (RF) terminal brush provided on a portion of the rotation table to transmit a RF signal.  
      In an exemplary implementation, a control panel is provided at each work station to control the driving unit.  
      In an exemplary implementation, the assembly unit, the test unit and the packaging unit are sequentially arranged.  
      In an exemplary implementation, the product comprises a monitor or television device which ranges from 15 to 24 inches.  
      The foregoing and/or other aspects of exemplary embodiments of the present invention are also achieved by providing an assembly unit on which components of a product are assembled, comprising a moving unit for moving the product, a worktable adjacent to the moving unit and on which the components of the product are arranged, first and second auxiliary worktables comprising a plurality of accommodators in which the components of the product are seated to be assembled to the product and a caster movably provided on a lower portion thereof, and a rotator which is detachably provided to rotate at least one of the first and second auxiliary worktables corresponding to the other to a predetermined angle.  
      In an exemplary implementation, the rotator comprises a plurality of projections which protrude from at least one of the first and second auxiliary worktables toward the other, and a plurality of projection accommodators provided on at least one of the first and second auxiliary worktables to be engaged with the projections.  
      The foregoing and/or other aspects of exemplary embodiments of the present invention are also achieved by providing a test unit which tests and adjusts an assembled product, comprising a rotation table shaped like a round plate for rotating, a base for supporting the rotation table, a driving unit provided on the base and supplies a driving force to rotate the rotation table, and a plurality of jigs which is disposed on the rotation table at a predetermined interval and supports the product so that the rotation table rotates and forms a work station for a predetermined test.  
      In an exemplary implementation, the jigs comprise a fixing supporter for supporting a first side of the product, a moving supporter for supporting a second side of the product and moves in a lateral direction according to the size of the product, and an arm coupled with the rotation table and supports the fixing supporter and the moving supporter to rotate to a predetermined angle.  
      In an exemplary implementation, the arm comprises a speed controller for controlling the speed of the fixing supporter and the moving supporter.  
      In an exemplary implementation, the fixing supporter and the moving supporter each comprise an inclination member which is inclined to a predetermined angle, a bending member which is bent from a lower end of the inclination member, and a shock-absorbing member respectively attached to the inclination member and the bending member which provides contact with the product.  
      In an exemplary implementation, the jigs comprise a pattern generator for supplying a predetermined signal to the product.  
      In an exemplary implementation, the test unit further comprises a fixing table provided on a center area of the rotation table and coupled with the base, and a power supply which is electrically connected with the fixing table and the rotation table for supplying power or transmitting data therebetween.  
      In an exemplary implementation, the test unit further comprises an operation table provided below the rotation table to be spaced therefrom and coupled with the base.  
      In an exemplary implementation, the test unit further comprises an elastic radio frequency (RF) terminal brush provided on a portion of the rotation table for transmitting a RF signal.  
      In an exemplary implementation, a control panel is provided at each work station for controlling the driving unit.  
      In an exemplary implementation, the product comprises a monitor device which ranges from 15 to 21 inches. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The above and other objects, features and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:  
       FIG. 1  is a plan view of a manufacturing system according to an exemplary embodiment of the present invention;  
       FIGS. 2A and 2B  are a front view and a side view of first and second auxiliary worktables of the manufacturing system according to an exemplary embodiment of the present invention;  
       FIG. 3  is a perspective view of a test unit of the manufacturing system according to an exemplary embodiment of the present invention;  
       FIG. 4  is a sectional view of the test unit of the manufacturing system according to an exemplary embodiment of the present invention;  
       FIG. 5  is a perspective view of a jig of the manufacturing system according to an exemplary embodiment of the present invention;  
       FIGS. 6A and 6B  illustrate a rotating state of the jig of the manufacturing system according to an exemplary embodiment of the present invention; and  
       FIG. 7  is a plot plan view of a workstation of the test unit of the manufacturing system according to an exemplary embodiment of the present invention. 
    
    
      Throughout the drawings, the same drawing reference numerals will be understood to refer to the same elements, features and structures.  
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS  
      The matters defined in the description such as a detailed construction and elements are provided to assist in a comprehensive understanding of exemplary embodiments of the invention. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.  
      As shown in  FIG. 1 , a monitor device manufacturing system  10  according to an exemplary embodiment of the present invention comprises an assembly unit  20  which assembles components of a monitor device  11 ; a test unit  70  which tests and adjusts the assembled monitor device  11 ; and a packaging unit  160  which packages the monitor device  11  that has passed the test unit  70 . The assembly unit  20 , the test unit  70  and the packaging unit  160  of the monitor device manufacturing system  10  are sequentially disposed, thereby improving work efficiency. The respective units of the monitor device manufacturing system  10  may be variously disposed, for example, in series, in parallel or in radial arrangements necessary.  
      As shown in  FIGS. 1, 2A  and  2 B, the assembly unit  20  comprises a moving unit  30  which moves the monitor device  11 ; a worktable  40  which is adjacent to the moving unit  30  to assemble components of the monitor device  11  thereon; a plurality of accommodators  51   a  and  51   b  in which the components of the monitor device  11  are seated to be assembled to the plurality of monitor devices  11 ; and a first auxiliary worktable  50  and a second auxiliary worktable  60  which have casters  55   a  and  55   b  movably provided on a lower part thereof. The first and second auxiliary worktables  50  and  60  comprise a rotator  57  which is detachably provided to rotate one of the first and second auxiliary worktables  50  and  60  with respect to the other within a predetermined angle.  
      As shown in  FIG. 1 , the moving unit  30  is provided on a center area of the assembly unit  20  to move the assembled monitor device  11 . The moving unit  30  is generally provided as a conveyor. The moving unit  30  comprises a plurality of rollers (not shown) which are disposed in a row; and a driving motor (not shown) which provides a driving force to at least one of the plurality of rollers by a driving force transferring means such as a chain or a belt. The moving unit  30  may be provided as several conveyors, which are connectable to each other, are necessary.  
      As shown in  FIGS. 1, 2A  and  2 B, the worktable  40  is adjacent to the moving unit  30  to assemble the components of the monitor device  11  thereon. The worktable  40  has an open configuration so that a worker may move forwards and backwards, leftwards and rightwards when the worker assembles the components of the monitor device  11 . Also, the respective worktables  40  face each other in a zigzag pattern, leaving the moving unit  30  therebetween, thereby reducing mutual interference while working. The worktable  40  comprises a rotating assembly table  41  (refer to  FIGS. 6A and 6B ) to support and assemble the components of the monitor device  11 . The worktable  40  may further comprise an alarm lamp (not shown) which displays an operation state and an emergency; and an assembly work panel (not shown) which controls the alarm lamp.  
      As shown in  FIGS. 1 and 2 A, the first and second auxiliary worktables  50  and  60  comprise the plurality of accommodators  51   a  and  51   b  in which the components of the monitor device  11  are seated to assemble the plurality of monitor devices  11  thereon; casters  55   a  and  55   b  which are movably disposed on the lower part thereof; and the rotator  57  which is detachably provided to rotate one of the first and second auxiliary worktables  50  and  60  with respect to the other to a predetermined angle. The first and second auxiliary worktables  50  and  60  are adjacent to the worktable  40  and move the components into a predetermined place. One of the first and second auxiliary worktables  50  and  60  rotates to reduce a work radius of a worker, thereby performing functions as a component vehicle, a component storage and a work table.  
      As shown in  FIGS. 2A and 2B , the accommodators  51   a  and  51   b  may accommodate the components to assemble the plurality of monitor devices  11  and comprise partitions  53   a  and  53   b  which are shaped like a bar to divide and accommodate the components as necessary. A shock absorber (not shown) is attached to a predetermined surface of the accommodators  51   a  and  51   b , contacting with the components, thereby preventing damages of the components such as a scratch caused when moving, storing and withdrawing the components. For example, the accommodators  51   a  and  51   b  divide and accommodate a display unit (not shown) which displays an image thereon; a shield cover (not shown) which protects internal circuits; front and rear covers (not shown); and a cable (not shown) through which power and signals are supplied and transmitted. The shock absorber may be attached to a part of the accommodators  51   a  and  51   b  which accommodate the display unit.  
      As shown in  FIG. 2A , the casters  55   a  and  55   b  are attached to a lower part of the first and second auxiliary worktables  50  and  60  to move the worktables  50  and  60 . The casters  55   a  and  55   b  may comprise a brake to fix the worktables  50  and  60  as necessary.  
      As shown in  FIGS. 2A and 2B , the rotator  57  comprises a plurality of projections  58  which protrudes from one of the first and second auxiliary worktables  50  and  60  toward the other; and a plurality of projection accommodators  59  which are provided on the other one of the first and second auxiliary worktables  50  and  60  to be engaged with the projections  58 . The plurality of projections  58  are shaped like a ball and comprise a spring therein. Alternatively, the rotator  57  may comprise various configurations including a hinge and a hinge pin, a hook and a hook engaging unit.  
      Thus, the first and the second auxiliary worktables  50  and  60  perform functions as the component vehicle, the component storage and the work table, simultaneously, thereby reducing a required work space, using the work space efficiently, minimizing a moving operation of the conveyor and preventing noises and shocks when moving the monitor device  11 . Further, the first and second auxiliary worktables  50  and  60  are adjacently disposed to the work radius of a worker, thereby reducing a required work force and providing improved productivity with a small work force.  
      As shown in  FIGS. 1, 3  and  4 , the test unit  70  comprises a rotation table  80  which is shaped like a round plate and rotates; a base  75  which supports the rotation table  80 ; a driving unit  81  which is provided on the base  75  to supply a driving force to the rotation table  80 ; and a plurality of jigs  90  which are disposed on the rotation table  80  at predetermined intervals and support the monitor device  11  so that the rotation table  80  rotates and forms a work station performing a predetermined test. The test unit  70  further comprises a pattern generator  110  which supplies a predetermined signal to the monitor device  11 . The test unit  70  further comprises a fixing table  120  which is spaced from the rotation table  80  on the center thereof and coupled with the base  75 ; and an operation table  140  which is shaped like a plate and is spaced from the rotation table  80  on a lower part thereof and coupled with the base  75 .  
      As shown in  FIGS. 3 and 4 , the rotation table  80  is shaped like a round plate and driven by the driving unit  81  to support the jigs  90 . Thus, a conveyor and a pallet are not necessary to test the monitor device  11 , thereby occupying a smaller space than the conventional conveyor and enhancing space efficiency. The rotation table  80  comprises a radio frequency (RF) terminal brush  153  which is provided on a lower part thereof to transmit a RF signal to the monitor device  11  supported by the jigs  90 . As shown in  FIG. 3 , the RF terminal brush  153  comprises a flexible contacting surface which contacts with two copper plates  155  provided for ground and signals on the operation table  140  or the base  75  corresponding to the RF terminal brush  153 . Thus, the monitor device  11  may receive the RF signal without interference by inductance. Here, the diameter of the rotation table  80  is approximately 1400 mm, when manufacturing the monitor device  11  ranging from 21 to 24 inches.  
      As shown in  FIG. 3 , the base  75  supports the rotation table  80  and is coupled with the driving unit  81 , the operation table  140  and the fixing table  120 . The base  75  may accommodate a power control box (not shown) and a PC (not shown) to perform the test.  
      As shown in  FIG. 3 , the driving unit  81  comprises a driving motor  83 ; a driving gear  85  which is connected with the driving motor  83 ; and a driven gear  87  which is engaged with the driving gear  85  and rotates the rotation table  80 . As the rotation angle of the rotation table  80  is small, the driving motor  83  comprises a reduction gear. The driving motor is controlled to adjust the rotation speed and the rotation speed is reduced when almost reaching a predetermined rotation angle. Thus, the monitor device  11  is gradually moved, thereby preventing shocks and noises generated when moving the monitor device  11 .  
      As shown in  FIGS. 3 through 5 , the jigs  90  are disposed on the rotation table  80  at predetermined intervals and support the monitor device  11  so that the rotation table  80  rotates and forms the work station to perform the predetermined test. The jigs  90  comprise a fixing supporter  91  which supports a first side of the monitor device  11 ; a moving supporter  93  which moves in a lateral direction according to the size of the monitor device  11  to support a second side of the monitor device  11 ; and an arm  95  which is coupled with the rotation table  80  and supports the fixing supporter  91  and the moving supporter  93  to rotate to a predetermined angle.  
      As shown in  FIG. 4 , the fixing supporter  91  supports the monitor device  11  together with the moving supporter  93 . The fixing supporter  91  comprises inclination members  96  ( 96   a  and  96   b ) which are inclined to a predetermined angle to stably support the monitor device  11 ; and bending members  97   a  and  97   b  which are bent from a lower end of the inclination members  96   a  and  96   b . Shock-absorbing members  98  ( 98   a  and  98   b ) are attached to the inclination members  96   a  and  96   b  and the bending members  97   a  and  97   b  which contact with the monitor device  11 . The inclination members  96   a  and  96   b  and the bending members  97   a  and  97   b  are shaped like an elongated bar, but not limited thereto. Alternatively, the inclination members  96   a  and  96   b  and the bending members  97   a  and  97   b  may have various known shapes.  
      As shown in  FIG. 4 , the moving supporter  93  supports the monitor device  11  together with the fixing supporter  91 . The moving supporter  93  has a structure that is capable of sliding laterally according to the size of the monitor device  11 . The moving supporter  93  comprises the inclination members  96   a  and  96   b , the bending members  97   a  and  97   b  and the shock-absorbing members  98   a  and  98   b . Detailed description thereof will not be provided here as it has been described above or will be described later. The slidable structure of the moving supporter  93  comprises a sliding projection  101  which protrudes to an upper part of the inclination members  96   a  and  96   b ; and a sliding slot  103  which accommodates the sliding projection  101  and guides the moving supporter  93 . Alternatively, the slidable structure may comprise other known means such as a roller.  
      Thus, the jigs  90  are adjusted without difficulty coping with the monitor devices  11  in various sizes, and the monitor device  11  is stably supported by the inclination members  96   a  and  96   b , thereby effectively corresponding to unbalance due to rotation of the rotation table  80 .  
      As shown in  FIG. 4 , the arm  95  is coupled with the rotation table  80  and rotatably supports the fixing supporter  91  and the moving supporter  93 . The arm  95  comprises a speed controller  105  which controls a rotation speed of the fixing supporter  91  and the moving supporter  93 ; and an angle limiter  107  which limits the rotation of the fixing supporter  91  and the moving supporter  93  within a predetermined angle range.  
      As shown in  FIG. 4 , the speed controller  105  controls the rotation speed of the fixing supporter  91  and the moving supporter  93  which support the monitor device  11 . The speed controller  105  may comprise an elastic member (not shown) such as a compression spring or a plate spring which is inserted into a rotation part thereof; and a screw (not shown) which controls a friction force of the elastic member. The speed controller  105  may further comprise various known elements. Thus, a worker rotates the monitor device  11  without difficulty, thereby improving work efficiency.  
      As shown in  FIGS. 4 and 5 , the angle limiter  107  is disposed on the arm  95  to make jigs  90  supporting the monitor device  11  rotate within the predetermined angle ranges. The angle limiter  107  may have various known structures. For example, the angle limiter  107  may comprise an angle limiting projection; and an angle limiting projection accommodator which is engaged with the angle limiting projection to guide the fixing supporter  91  and the moving supporter  91  to rotate.  
      As shown in  FIG. 4 , the shock-absorbing members  98   a  and  98   b  are attached to the inclination members  96   a  and  96   b , and the bending members  97   a  and  97   b  which are contacted with the monitor device  11 . The shock-absorbing members  98   a  and  98   b  comprise urethane which is highly durable and absorbs shock effectively, but not limited thereto. Alternatively, the shock-absorbing members  98   a  and  98   b  may comprise various known materials.  
      Thus, the monitor device  11  supported by the jigs  90  is prevented from damages such as a scratch.  
      As shown in  FIG. 3 , the pattern generator  110  supplies a predetermined signal to the monitor device  11 . The pattern generator  110  is additionally provided with a power supply and is disposed on the jigs  90 , respectively. Thus, the pattern generator  110  is connected with the monitor device  11  and displays an image on the display unit during test. In the pattern generator  110 , a signal may be transmitted by infra data.  
      The test unit  70  has a round shape and comprises the jigs  90  supporting the monitor device  11 , thereby occupying a smaller space than the elongated conveyor, using the space efficiently and reducing vibrations, shocks and noises generated when moving the monitor device  11  with a small rotation angle. Also, the working radius of a worker is reduced and the monitor device  11  is adjusted to a predetermined angle without difficulty, thereby providing improved productivity with a small work force. Further, as the monitor device  11  is supported by the jigs  90 , the conventional pallet which supports the monitor device  11  is not necessary.  
      As shown in  FIG. 3 , the fixing table  120  is disposed on the rotation table  80  and coupled with the base  75  to fix a measuring instrument, which is required for a test at each work station. As the monitor device  11  supported by the fixing table  120 , the operation table  140  and the jigs  90  is properly placed, a worker can perform various tests simultaneously. Here, the diameter of the fixing table  120  is approximately 1300 mm and the height thereof is about 1400 mm from a bottom, when manufacturing the monitor device  11  ranging from 21 to 24 inches.  
      As shown in  FIG. 3 , the power supply  130  is electrically connected with the fixing table  120  and the rotation table  80  to supply power and to transmit data. Preferably, the power supply  130  comprises a cover (not shown) to prevent damages due to an external contact.  
      As shown in  FIG. 3 , the operation table  140  is shaped like a plate and disposed below the rotation table  80  to be spaced therefrom and coupled with the base  75 . The operation table  140  can be used as a working space. A control panel  150 , which will be described later, is fixed to the operation table  140 . Here, the diameter of the operation table  140  is about 2600 mm and the height thereof is about 800 mm, when manufacturing the monitor device  11  ranging from 21 to 24 inches. Thus, the test unit  70  occupies a smaller space than the conventional conveyor, thereby using the space efficiently, reducing the working radius of a worker, and providing improved work efficiency with a minimized work force.  
      As shown in  FIG. 7 , a path  141  is detachably disposed on a part of the operation table  140  so that a worker can access a center area of the operation table  140 . A worker may access the driving unit  81  of the rotation table  80  without difficulty, when repairing or replacing the driving unit.  
      The fixing table  120  and the operation table  140  comprises a medium density fiber board (MDF) which is light, fine in surface and strong, but not limited thereto. Alternatively, the fixing table  120  and the operation table  140  may comprise various known materials.  
      The path  141  may comprise a tower lamp (not shown) which displays an operation state of the system by color.  
      As shown in  FIG. 3 , the control panel  150  is disposed at each work station of the operation table  140  so that a worker may input a command such as work completion and emergency stop of the work station.  
      As shown in  FIG. 1 , the packaging unit  160  packages the monitor device  11  which has passed through the test unit  70 . In the packaging unit  160 , the monitor device  11  is packaged by a packaging box (not shown) which is provided to package the monitor device  11  in predetermined numbers and a shock absorber which protects the monitor device  11  from external shocks.  
      The monitor device  11  is provided as an example of the present invention, but not limited thereto. Alternatively, an exemplary embodiment of the present invention may be applicable for any various products that are assembled, tested, adjusted and packaged through a series of processes. Also, the rotation table, the work table may vary in size according to the size of products.  
      The manufacturing system  10  which manufactures the monitor device  11  may be provided in series or parallel as necessary.  
      With this configuration, a process of operating the manufacturing system  10  of the monitor device  11  according to an exemplary embodiment of the present invention will be described with reference to  FIGS. 5 through 7 .  
      First, components to be assembled as a plurality of monitor devices  11  are stably seated on the accommodators  51   a  and  51   b  of the first and second auxiliary worktables  50  and  60 . As shown in  FIG. 6A , the first and second auxiliary worktables  50  and  60  are moved to be adjacent to each worktable  40 . The first auxiliary worktable  50  is provided in front of the second auxiliary worktable  60 . As shown in  FIG. 6B , the second auxiliary worktable  60  rotates 90° by the rotator  57  to be placed to a side part of the worktable  40  and adjacent to the working radius of a worker. At this time, the casters  55   a  and  55   b  are fixed. A worker assembles the components according to a predetermined assembly order to complete the monitor device  11 . The completed monitor device  11  is moved to the assembly unit  20  by the moving unit  30  for a next process. When the plurality of components accommodated in the accommodators  51   a  and  51   b  of the first and second auxiliary worktables  50  and  60  are all used, the first and second auxiliary worktables  50  and  60  are coupled with each other in a straight line to be moved from the worktable  40  and to be replaced with another first and second auxiliary worktables  50  and  60  in which necessary components are stably seated. Thus, a worker may work without difficulty as his/her working radius is reduced. Also, a component keeping space is less required as additional storage is unnecessary. The length of the moving unit  30  is reduced, thereby reducing vibrations transferred to the monitor device  11 , shocks and noises generated when moving the monitor device  11 . Accordingly, work efficiency can be improved.  
      Hereinafter, it is assumed that the test unit  70  is divided into twelve (12) parts. In the test unit  70 , there are provided twelve (12) jigs and twelve (12) work stations to perform the test. The size of the monitor device  11  may range from twenty-one (21) to twenty-four (24) inches. Additionally, the present invention may comprise more than twenty-four (24) inch monitor device.  
      The monitor device  11  which is assembled completely is moved to the test unit  70 . The moving supporter  93  of the test unit  70  is adjusted in advance according to the size of the monitor device  11 . The monitor device  11  is stably seated on the jigs  90  of the test unit  70  automatically or manually to be contacted with the shock-absorbing members  98   a  and  98   b . The monitor device  11  may be stably seated on the jigs  90  through an automatic method by vacuum pressure as necessary. Power and signal connectors (not shown) which are adjacent to the jigs  90  are connected with power and signal cables of the monitor device  11 . When power is supplied to the driving unit  81  of the test unit  70 , the driving motor  83  of the driving unit  81  rotates the driving gear  85 . When the driven gear  87  is driven by the driving gear  85 , the rotation table  80  coupled with the driven gear  87  rotates to a predetermined angle. Here, a power supply  130  supplies power and transmits data. The RF terminal brush  153  may be connected with a concerned copperplate to transmit the RF signal.  
      As shown in  FIG. 7 , the monitor device  11  supported by the jigs  90  rotates and passes the tests sequentially. That is, the monitor device  11  passes a display power management signaling (DPMS) test which estimates power consumption of the monitor device  11  when receiving no signal; a voltage endurance test which tests whether the monitor device  11  endures a predetermined voltage; a digital test which tests a digital visual interface (DVI) terminal; an auto adjustment test which adjusts the size of an image according to the size of the display unit displaying an image thereon; an analog test which tests an analog signal; and a direct digital control (DDC) input test which supplies predetermined information to an erasable programmable read-only memory (EPROM).  
      As shown in  FIG. 5 , as the jig  90  rotates and the angle and speed of the jigs  90  are adjusted by the angle limiter  107  and the speed controller  105 , a worker can work without difficulty.  
      Hereinafter, the respective tests which are implemented by automatic, semi-automatic and manual operations will be described.  
      First, the rotation table  80  rotates according to a predetermined input time in an automatic operation. When the predetermined time has passed, the driving unit  81  automatically rotates at a predetermined speed to rotate the rotation table  80  to 30°. Here, the driving unit  81  stops its operating. Here, the moving speed may be controlled in stages to not transfer shocks to the monitor device  11  supported by the jigs  90  or to not generate vibrations. A sensor (not shown) may be attached to the fixing table  120  to detect whether the rotation table  80  rotates 30° exactly. The rotation table  80  may be interlocked not to rotate itself, when the predetermined tests (for example, the voltage endurance test and the DMPS test) are not completed. A worker may be informed of the rotation of the rotation table  80  seconds before the rotation thereof in the automatic operation.  
      In the semi-automatic operation, a worker inputs a completion signal through the control panel  150  when the predetermined test is completed. When all the workers input the completion signal, the driving unit  81  automatically operates to rotate the rotation table  80  to 30°. Here, the driving unit  81  stops operating.  
      In the manual operation, a worker who is responsible for the final work confirms whether the work is completed and controls the control panel  150  to rotate the rotation table  80 . Also, a worker may raise an alarm for emergency.  
      The monitor device  11  which has passed the predetermined tests at the respective work stations is withdrawn from the jigs  90  and moved to the packaging unit  160 . The withdrawal process and the seat process of the monitor device  11  may be completed by the vacuum pressure. The monitor device  11  is packaged by the packaging box provided to package the monitor device  11  in predetermined numbers and a shock absorber which protects the monitor device from external shocks.  
      As described above, the assembly unit according to exemplary embodiments of the present invention comprises a minimized conveyor, and the test unit does not have the conveyor, thereby drastically reducing the pallet. As a round-shaped work station is provided in the test unit, the test unit occupies less and enhances the space efficiency. As the monitor device is slowly moved in the test unit, the monitor device may be prevented from shocks, vibrations and external forces due to the fast moving speed. Further, a worker can work without difficulty as the monitor device rotates by the jigs, thereby reducing the working radius of a worker and improving work efficiency. Accordingly, work efficiency can be improved through a minimized work force. Thus, the manufacturing system according to exemplary embodiments of the present invention may cope with various products and with the increase/decrease of production.  
      Exemplary embodiments of the present invention also provides a manufacturing system, which reduces a moving unit, such as a conventional conveyor, and a pallet supporting products, and prevents vibrations, shocks and noises generated when the conveyor moves fast.  
      While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents.