Patent Publication Number: US-2016221141-A1

Title: Grinding device

Description:
BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The present invention relates to mechanical processing device, and more particularly to a grinding device for making cylinders or cylindrical workpieces. 
     2. Description of Related Art 
     A conventional approach to grinding cylinders or cylindrical workpieces is that workers use abrasive paper to manually grind the workpieces at where the workpieces will rotationally combined with other articles. However, the result of manual grinding is highly dependent on the workers&#39; skill and it is often seen that the grounded sites are not evenly and/or adequately processed. When such a ragged and/or rough cylinder (such as a rotor shaft) is applied or assembled as a part to a mechanism (such as a motor), it is unlikely to fit the surrounding parts well, and the resultant poor combination can generate noise and/or even have adverse effects on the service life of the mechanism, in turn causing great trouble to the users. Therefore, the conventional approach needs to be improved. 
     BRIEF SUMMARY OF THE INVENTION 
     In view of the aforementioned need, the primary objective of the present invention is to provide a grinding device that grinds cylinders with better quality and lower labor costs, and endows the ground cylinders with improved evenness and fineness. 
     For achieving the objective as stated above, the disclosed grinding device is configured to grind a cylinder that has a rotating shaft. The grinding device comprises an immovable component, a movable component, and a grinding component. The immovable component has a positioning unit. The cylinder is such installed on the positioning unit that it is rotatable against the rotating shaft. The movable component has a carrying portion. The movable component is such installed on the immovable component that it is axially movable along the rotating shaft. The carrying portion is positionally corresponding to the cylinder. The grinding component is located on the carrying portion and positionally corresponding to a surface of the rotating shaft. Thereby, when the cylinder rotates against the rotating shaft, the grinding component peripherally grinds peripherally grinds the surface of the rotating shaft. When the movable component move axially along the rotating shaft, the grinding component also move axially along the rotating shaft of the cylinder and linearly grinds the surface of the rotating shaft, thereby making the surface of the rotating shaft ground more evenly. 
     The invention as well as a preferred mode of use, further objectives and advantages thereof will be best understood by reference to the following detailed description of illustrative embodiments when read in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  is a front view of a preferred embodiment of the present invention. 
         FIG. 2  is a side view of the preferred embodiment of the present invention, showing that the driving unit drives the cylinder to rotate. 
         FIG. 3  and  FIG. 4  are front views of the preferred embodiment of the present invention, showing that the driven unit drives the movable component. 
         FIG. 5  is a side view of the preferred embodiment of the present invention, showing that the driving unit is unable to drive the cylinder to rotate. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to  FIG. 1  through  FIG. 5 , according to the present invention, a grinding device  10  used for grinding a cylinder  20  is disclosed. In the depicted preferred embodiment, the cylinder  20  is illustratively a motor rotor. The cylinder  20  has a rotating shaft  22 . The grinding device  10  comprises an immovable component  30 , a movable component  40 , and two grinding components  50 . 
     The immovable component  30  comprises a carrying surface  32 , a positioning unit  34 , a driving unit  36 , and a driven unit  38 . The carrying surface  32  is a smooth surface. The positioning unit  34  is deposited on the carrying surface  32 . The positioning unit  34  comprises two fixing shafts  342 , two posts  343 , and a positioning space  344 . The two posts  343  each have one end perpendicular installed on the carrying surface  32 . The two fixing shafts  342  are each located at the other end of the two post  343 . The two fixing shafts  342  are axially aligned. The positioning space  344  is defined between the two fixing shafts  342 . The cylinder  20  is placed in the positioning space  344  and rotatable against the rotating shaft  22 . The two fixing shafts  342  abut against two ends of the rotating shaft  22 , so as to support the cylinder  20  to rotate against the rotating shaft  22 . 
     The driving unit  36  comprises a first power source  362  and a driving member  364 . The driving member  364  is pivotally movable between a first position P 1  (as shown in  FIG. 2 ) and a second position P 2  (as shown in  FIG. 5 ). The first power source  362  may be a motor or the like, for powering the driving member  364  to act while the driving member  364  may be a belt set or the like. When the driving member  364  is at the first position P 1 , the first power source  362  drives the driving member  364  to act. Since the driving member  364  is pressing upon the cylinder  20 , the cylinder  20  is driven to rotate against the rotating shaft  22 . When the driving member  364  is at the second position P 2 , the driving member  364  is away from the cylinder  20 , and the cylinder  20  is not driven to rotate. The driven unit  38  comprises a second power source  382  and a cam  384 . The second power source  382  powers the cam  384  to rotate. 
     The movable component  40  is installed on the carrying surface  32 . The movable component  40  comprises a carrying portion  42 , a rail unit  44 , and a frame  48 . The movable component  40  slides on the rail unit  44  so as to move over the carrying surface  32 . The carrying portion  42  is positionally corresponding to the cylinder  20 . The carrying portion  42  has two symmetrically formed notches  422  for receiving the two ends of the rotating shaft  22  of the cylinder  20 . The carrying portion  42  has two clip slots  46  each located by one of the two notches  422 . The frame  48  is provided beside the movable component  40 , so that the cam  384  and the frame  48  press against each other. Thereby, when the second power source  382  drives the cam  384  to rotate, the cam  384  in turn drives the movable component  40  to move linearly to and fro along the carrying surface  32 . 
     The grinding component  50  may be abrasive paper, sand cloth or other materials having abrasive effects. The grinding component  50  may be in the form of a flat sheet or a roll that can automatically expand or roll up. The grinding components  50  are held in the clip slots  46 , so that the grinding components  50  are corresponding to the surfaces of the two ends of the rotating shaft  22  of the cylinder  20 . When the two ends of the rotating shaft  22  of the cylinder  20  are received in the two notches  422 , the surfaces of the two ends of the rotating shaft  22  of the cylinder  20  abut against the two grinding components  50 , respectively. 
     The technical features described above may be further explained with reference to  FIG. 1  and  FIG. 2 . The cylinder  20  is placed on the carrying portion  42  so that the surfaces of the two ends of the rotating shaft  22  of the cylinder  20  contact the grinding components  50 , respectively, and the two fixing shafts  342  abut against the two ends of the rotating shaft  22 . When the driving member  364  is at the first position P 1 , the driving member  364  is pressing on the cylinder  20 , so the two ends of the rotating shaft  22  are pushed toward and thereby press more closely on the grinding components  50 . Referring to  FIG. 3  and  FIG. 4 , when the first power source  362  drives the driving member  364 , the driving member  364  in turn drives the cylinder  20  to rotate against the rotating shaft  22 , which allowing the grinding components  50  to peripherally grind the surfaces of the two ends of the rotating shaft  22 . When the second power source  382  at the same time powers the cam  384  to rotate, since the two ends of the rotating shaft  22  of the cylinder  20  are propped by the two fixing shafts  342 , the cam  384  in turn drives the frame  48  to make the entire carrying portion  42  to move axially to and fro along the rotating shaft  22 . As a result, the grinding components  50  move along the rotating shaft  22  of the cylinder  20  to and fro and linearly grind the surfaces of the two ends of the rotating shaft  22 , thereby achieving back and forth grinding. 
     It is to be restated that the conventional approach to grinding a cylinder is that workers use abrasive paper to manually grind the axle of the workpiece and tends to cause ragged and/or rough ground surfaces of the cylinder. When such a cylinder (e.g. a rotor shaft) is applied or assembled as a part to a mechanism (e.g. a motor), it is unlikely to fit the surrounding parts well, and the resultant poor combination can generate noise and/or even have adverse effects on the service life of the mechanism. However, the disclosed grinding device  10  uses the movable component  40  to work with the positioning unit  34 , the driving unit  36 , and the driven unit  38 , so as to provide both peripheral and linear grinding to the rotating shaft  22  of the cylinder  20 . Thereby, the disclosed grinding device can perform grinding with better quality and lower labor costs, and endows the ground rotating shaft  22  with improved evenness and fineness. 
     The present invention has been described with reference to the preferred embodiments and it is understood that the embodiments are not intended to limit the scope of the present invention. Moreover, as the contents disclosed herein should be readily understood and can be implemented by a person skilled in the art, all equivalent changes or modifications which do not depart from the concept of the present invention should be encompassed by the appended claims.