Abstract:
A machine with X-axis double speed mechanism includes two axles along which the work piece carrying assembly and the tool fixing assembly are respectively moved in parallel with each other. The work piece carrying assembly and the tool fixing assembly are moved relatively so as to double the relative speed and to shorten the length of the machine.

Description:
FIELD OF THE INVENTION  
         [0001]    The present invention relates to a machine having double speed mechanism along the X direction.  
         BACKGROUND OF THE INVENTION  
         [0002]    A conventional machine which requires fast movement speed for the work piece or the tool such as rapid proto-typing machines, surface or cylinder grinders employ high speed motor, belt type gearing system, high-lead lead screw, or linear motor. Nevertheless, there are several problems that these improvements that are used cannot successfully solved. The longer distance of travel of the tool or the work piece to be machined makes the whole length of machine longer than the old ones. The longer length of the machine requires the longer and larger space to install therein. And, the lead screw is more likely to have deformation because the length and this affects the accuracy of machining. This induce the accuracy of machines is not excellent. Beside, although the linear motor without loading can up to a high acceleration of 4G (acceleration of gravity), the heavy base for carrying the tool or the work piece to be machined is so heavy, such that the acceleration for linear motor is only 1G under loading. When the object (work piece or tool) movement just reaches highest speed, it must to slow down for stopping before the end of the bench.  
           [0003]    The present invention intends to provide a machine with X-axis and the speed in the X direction is double of that of the conventional machines.  
         SUMMARY OF THE INVENTION  
         [0004]    In accordance with one aspect of the present invention, there is provided a machine with X-axis double speed mechanism, which comprising a base, a work piece carrying assembly and a tool carrying assembly. The work piece carrying assembly is mounted on a top of the base. A carrying board is mounted to the work piece carrying assembly and movable along a direction, we call it the X direction, and which is the first axle. The tool fixing assembly, having a tool connected thereto, is mounted on the top of the base. And, the tool connecting to the tool fixing assembly is movable along a direction, which is the second axle. And, the first axle is parallel to the second axle.  
           [0005]    The primary object of the present invention is to provide a machine with X-axis double speed mechanism that has shorter distance of travel and double speed for approaching the tool to the work piece to be machined.  
           [0006]    Another object of the present invention is to provide a machine with X-axis double speed mechanism which can be approved the stability and stiffness of the present invention.  
           [0007]    Yet another object of the present invention is to provide a machine with X-axis double speed mechanism which may be occupied less space and this is benefit for allocation the machines in a work site.  
           [0008]    The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]    [0009]FIG. 1 is a front view to show the machine of the present invention.  
         [0010]    [0010]FIG. 2 is a side view to show the machine of the present invention, and  
         [0011]    [0011]FIG. 3 is a top view to show the machine of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0012]    Referring to FIGS.  1  to  3 , the machine of the present invention comprises a base  1 , a tool fixing assembly  2  and a work piece carrying assembly  3 . The work piece carrying assembly  3  is mounted on a top of the base  1 . The work piece carrying assembly  3  includes a first axle  31 , a carrying board  32 , a third axle  33  and a saddle unit  34  at this embodiment. The first axle  31  further comprises a motor  311 , two bearing sets  312  and  313 , a nut  314 , two rails  315  and  316 , and a screw  317 . The motor  311  connects to the screw  317 , and drives the screw  317  rotating. Two bearing sets  312  and  313  support the screw  317 . The nut  314  which connected to the carrying board  32  is movably mounted to the screw  317 , and can carry the carrying board  32  moving along the direction of the screw  317 . It transfers the rotational power of the motor  311  into the movement along the screw  317 . Two rails  315  and  316  are respectively formed on the saddle unit  34  and may be used to limit the carrying board  32  moving direction relative to the saddle unit  34 . The carrying board  32  is mounted on the first axle  31  and its moving direction is same to the direction of the screw  317 , and we define it as the X direction.  
         [0013]    A saddle unit  34  is located below the work piece carrying assembly  3  and movable along a third axle  33 . The third axle  33  further comprises a motor  331 , two bearing sets  332  and  333 , a nut  334 , two rails  335  and  336 , and a screw  337 . The motor  331  connects to the screw  337 , and drives the screw  337  rotating. Two bearing sets  332  and  333  support the screw  337 . The nut  334  which connected to the saddle unit  34  is movably mounted to the screw  337 , and can carry the saddle unit  34  moving along the direction of the screw  337 . Two rails  335  and  336  are respectively formed on the base  1  and may be used to limit the saddle unit  34  moving direction relative to the base  1 . The saddle unit  34  is mounted on the third axle  33  and its moving direction is same to the direction of the screw  337 . The third axle  33  is perpendicular to the first axle  31 , and we define it as the Y direction.  
         [0014]    The tool fixing assembly  2  is mounted on a top of the base  1 , too. The tool fixing assembly  2  includes a second axle  21 , an upright post  22  and a fourth axle  23 . Similar to the first axle  31 , the second axle  21  further comprises a motor (not shown), bearing sets (not shown), two rails  215  and  216 , a screw  217 , and the nut (not shown) for the screw  217 . Two rails  215 ,  216  are respectively formed on the top of the base  1  and parallel to first axle  31 . The screw  217  driven by a motor connects to the nut, and the nut drives the upright post  22  moving along the direction of the rails  215  and  216  which parallel to the first axle  31 , the X direction.  
         [0015]    The fourth axle  23  is located in the upright post  22  and perpendicular to the base  1 . So, the fourth axle  23  is perpendicular to first axle  31 (the X direction) and third axle  33 (the Y direction), and we call the motion direction of the fourth axle  23  as Z direction. The fourth axle  23  further comprises a motor ( 231 ), bearing sets (not shown), rails (not shown), a screw  237 , and a nut (not shown). The nut of the fourth axle  23  is connected to a tool chuck device  4 , and can drive the tool chuck device  4  moving along the Z direction. The tool  5  is connected to the tool chuck device  4  and driven by a motor  41 .  
         [0016]    When the work piece settled on the work piece carrying assembly  3  moves to one direction along the first axle  31 , the tool  5  settled on the fixing assembly  2  may move toward another direction along the second axle  21 . The first axle  31  is parallel to the second axle  21 . Such that, the relative speed for the work piece to be machined and the tool  5  is as double as the speed of the first axle  31  and second axle  21 . So, the relative speed for the work piece and the tool  5  is as double as the speed that a conventional machine may have. In other words, if the right end of a long work piece wants to be machined, the carrying board  32  will move to left at a first speed and the tool  5  moves to right at a second speed. So, the tool  5  can reach the right end of the work piece at the sum of the first speed and the second speed. If the first speed is the same as the second speed, the sum will be double as either the first speed or the second speed.  
         [0017]    The carrying board  32  and the tool  5  can move relative to the base  1 , such that the total travel for the work piece relative to the tool  5  is the sum travel of the first axle  31  and the second axle  21 . So, either the travel of the first axle  31  and the travel of the second axle  21  will shorter than the total travel of the machine in the embodiment of present invention. The total settled length of a machine must longer than the sum of the work piece length and total travel for prior art, but we can reduce a half of total travel in present invention. In present invention, the travel of the first axle  31  and the second axle  21  can be only a half of the total travel, and the length of the transfer parts (screws, rails . . . ) will be a half of the prior art. The total length of the machine is reduced in comparison with the conventional ones, so that it occupies less space and this is benefit for allocation of the machines in a work site. Beside, the length of each part of the machine is shortened so that the stiffness of the machine can be increased.  
         [0018]    While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.