Abstract:
The present invention relates to a one-touch chamfering-amount adjustment device for a chamfering machine which specifically carries out a chamfering process on the welding bead surfaces of objects to be processed (such as metal sheet materials and pipes). In the present invention, the moment after a chamfering-amount-adjustment piece has been manipulated so as to rotate, a position-setting pin is inserted into a securing recess in the chamfering-amount-adjustment piece and as this happens the chamfering amount is precisely adjusted in units and at the same time locking to the predetermined chamfering amount is automatically maintained, yet nevertheless the adjustment of the chamfering amount is achieved in a straightforward fashion with one touch, and, when the chamfering-amount-adjustment piece is manipulated, a cutter shaft moves vertically and as it does so the chamfering amount is adjusted in such a way that the chamfering amount can be immediately and rapidly adjusted even during working regardless of any cutter rotating action.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a beveling machine for beveling a weld bead surface on a workpiece, and more particularly, a one-touch bevel cut depth controller for immediately and easily controlling the depth of bevel cut by a one-touch method, regardless of the rotational operation of a cutter. 
     2. Description of the Related Art 
     Generally, as the prior work for welding in a natural gas pipeline construction field or industrial plant pipe laying construction field, a relatively large sized workpiece (metal panel, pipe or the like) is cut according to a length requirement and then an edge of the workpiece is beveled so that a weld bead surface is shaped on the edge of the workpiece. When the workpiece with the shaped bead surface is connected with the other workpiece with the shaped bead surface, the bead surfaces between the workpieces form a weld bead receiving opening in a unified ridge shape by which the workpieces are easily integrally connected together, through welding work. 
     However, in a relatively large sized workpiece, the depth of bevel cut to shape a weld bead surface is great. Therefore, it takes a long time to cut a bevel on the large workpiece by using a typical small beveling tool. Moreover, it is difficult to accurately measure the depth of bevel cut and thus the quality of work is low. 
     Accordingly, a dedicated large-capacity beveling machine to process a bead surface for welding is required in the industrial fields. Further, for the proper functioning of the large-capacity beveling machine, it must perform to easily control the depth of bevel cut and to freely control the gradient of the bead surface. 
     Considering the aforementioned problems, the applicant of the present invention presented a beveling machine to process a weld bead surface in Korean Patent Registration No. 912485 (hereinafter, referred to as the prior art 1). 
     However, in the prior art 1, it is difficult to easily control the depth of bevel cut by a unit of 0.1 mm through a one-touch operation. In this beveling machine, the depth of bevel cut is adjusted by a rack by an operator&#39;s (arbitrary) setting, depending on his/her intention. Consequently, the accuracy is low and it takes a long time to control the depth of bevel cut. Specifically, after the depth of bevel cut is controlled, a special locking control unit needs to be tightened to prevent the bevel setting from being loosened. Thus, the inconvenience in using the beveling machine of the prior art 1 generally increases. 
     The applicant of the present invention presented a beveling tool to easily control the depth of bevel cut in Korean Patent Registration No. 575201 (hereinafter, referred to as the prior art 2) as prior art teaching a beveling tool to shape the slanted surface at the edge of a workpiece. The prior art 2 provides the effects of minutely controlling the depth of bevel cut by a simple method of using a bevel cut depth controlling unit and accurately maintaining the depth of bevel cut which is automatically controlled at the moment of releasing the bevel cut depth controlling unit which is held. 
     However, in the prior art 2, since the bevel cut depth controlling unit is pulled downwardly (toward a cutter) to control the depth of bevel cut, the operator&#39;s hand may be injured if the hand comes in contact with the cutter. Moreover, since the beveling tool of the prior art 2 comprises an adapter with a special fixed spline to maintain a setting condition of the bevel cut depth controlling unit, it is difficult to manufacture and its size is somewhat cumbersome. During operation, it is impossible to immediately control the depth of bevel cut. After stopping the operation and separating the beveling tool from the workpiece, it is possible to control the depth of bevel cut. Therefore, it takes a long time to control the depth of bevel cut. That is, the prior art 2 also has problems which need to be solved and also it needs to be improved upon. 
     SUMMARY OF THE INVENTION 
     To solve the above problems of the conventional art, it is therefore an object of the present invention to provide a one-touch bevel cut depth controller, whereby the depth of bevel cut is accurately controlled by a calibrated setting since a location setting pin is fit into a securing opening of a bevel cut depth controlling unit at the moment when the bevel cut depth controlling unit is released after it is operated to rotate and simultaneously since the setting of the bevel cut depth is automatically locked and maintained, to easily control the depth of bevel cut through a one-touch method. 
     It is also another object of the present invention to provide a one-touch bevel cut depth controller which comprises an assembly structure to operate the bevel cut depth controlling unit above a cutter so that it is opposite the cutter, to secure high safety by blocking any injury to the operator by the cutter. 
     It is also another object of the present invention to provide a one-touch bevel cut depth controller in which the depth of bevel cut is controlled during a cutter shaft vertically moves upon the operation of the bevel cut depth controlling unit, so that the depth of bevel cut is immediately and fast controlled during the operation, regardless of the rotational operation of the cutter. 
     In accordance with an exemplary embodiment of the present invention, there is provided a one-touch bevel cut depth controller in a beveling machine, wherein a movable spline shaft is connected to an upper center of a beveling machine body by a screw, a bevel cut depth controlling unit is connected to an outside of the movable spline shaft by a spline, a spring housing is integrally connected to an upper end of the movable spline shaft, an elastic spring is interposed between the spring housing and the bevel cut depth controlling unit, location setting pins positioned at an upper part of the beveling machine body in a circumferential direction are fit into a plurality of securing openings formed at a lower part of the bevel cut depth controlling unit in a circumferential direction, and a cutter shaft is rotatably installed in the movable spline shaft. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: 
         FIG. 1  is a side view of a beveling machine applying a one-touch bevel cut depth controller according to an embodiment of the present invention; 
         FIG. 2  is a sectional view taken along line A-A of  FIG. 1 ; 
         FIG. 3  is a longitudinal sectional view of a bevel cut depth controlling unit being pulled upwardly; 
         FIG. 4  is a longitudinal sectional view of the bevel cut depth controlling unit being rotated; 
         FIG. 5  is a longitudinal sectional view of a beveling machine body, a movable spline shaft, a bevel cut depth controlling unit and a spring housing as separated; 
         FIG. 6  is a longitudinal sectional view of a sleeve shaft and a cutter shaft; and 
         FIG. 7  is a front view of a cutter shaft according to the other embodiment of the present invention. 
     
    
    
     BRIEF DESCRIPTION OF REFERENCE NUMBERS OF MAJOR ELEMENTS 
     
       
         
               
               
               
             
               
               
             
               
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 10: bevelling machine body 
                  12: cutter operation unit 
               
               
                   
                 20: movable spline shaft 
                  21: first spline 
               
               
                   
                 30: bevel cut depth controlling unit 
                  31: second spline 
               
               
                   
                 32: guide groove 
                  40: spring housing 
               
               
                   
                 41, 83: locking members 
                  50: elastic spring 
               
               
                   
                 60: securing opening 
                  70: location setting pin 
               
               
                   
                 80: sleeve shaft 
               
             
          
           
               
                   
                 85: unintentional detachment preventing cap 
               
             
          
           
               
                   
                 90, 90a: cutter shaft 
                 110: bearing housing 
               
               
                   
                   
               
             
          
         
       
     
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. It will be understood that words or terms used in the specification and claims shall not be interpreted as the meaning defined in commonly used dictionaries. It will be further understood that the words or terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the technical idea of the invention, based on the principle that an inventor may properly define the meaning of the words or terms to best explain the invention. 
     Accordingly, while example embodiments of the present invention are capable of various modifications and alternative forms, embodiments of the present invention are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intent to limit example embodiments of the invention to the particular forms disclosed, but on the contrary, example embodiments of the invention are to cover all modifications, equivalents, and alternatives falling within the scope of the invention. 
     A one-touch bevel cut depth controller according to the present invention to achieve the aforementioned objects comprises in outline: a beveling machine body  10 , wherein a spline shaft connection unit  11  is positioned at an upper center part of the beveling machine body  10  and a cutter operation unit  12  is positioned at a lower center part thereof and the spline shaft connection unit  11  and the cutter operation unit  12  are operatively connected to each other; a movable spline shaft  20  to be vertically movably connected to the spline shaft connection unit  11  by a screw, wherein a first spline  21  is positioned around an upper outer circumference of the movable spline shaft  20 ; a bevel cut depth controlling unit  30 , wherein a second spline  31  surrounding an outside of the movable spline shaft  20  is positioned around an inner circumference of the bevel cut depth controlling unit  30  and moves by a vertical sliding motion, the second spline  31  is connected to the first spline  21  by a spline; a spring housing  40  to be inserted into a guide groove  32  formed at an upper part of the bevel cut depth controlling unit  30  and integrally attached to an upper end of the movable spline shaft  20 ; an elastic spring  50  to be interposed between an inner surface of the spring housing  40  and the guide groove  32  of the bevel cut depth controlling unit  30 ; a plurality of securing openings  60  formed at a lower part of the bevel cut depth controlling unit  30  in a circumferential direction; a plurality of location setting pins  70  to be positioned at an upper outer part  15  of the spline shaft connection unit  11  in a circumferential direction and to be selectively fit into the securing openings  60 , to fix the location of the bevel cut depth controlling unit  30  and maintain the locking thereof; a sleeve shaft  80  to be rotatably installed in the movable spline shaft  20 ; and a cutter shaft  90  to be rotatably installed in a bearing housing  110  installed to be inserted into a lower part of the cutter operation unit  12 , wherein the cutter shaft  90  is integrally connected to a lower end of the sleeve shaft  80  so that the cutter shaft  90  and the sleeve shaft  80  operatively rotate and vertically move together. 
     Hereinafter, the present invention having the constitution described in outline will be described in more detail, so as to be easily carried out. 
     The spline shaft connection unit  11  and the cutter operation unit  12  are respectively installed in the upper and lower centre positions of the bevelling machine body  10  so as to be operatively connected to each other. A power input unit  14  is positioned at a back side  13  of the bevelling machine body  10 . The power input unit  14  is operatively connected to the cutter operation unit  12  outside. 
     A lower part of the movable spline shaft  20  is fit into the spline shaft connection unit  11  so that both are connected to each other by a screw. The movable spline shaft  20  is vertically movable according to a selective rotational operation. The first spline  21  is positioned at an upper outer circumference of the movable spline shaft  20 . 
     The bevel cut depth controlling unit  30  is positioned so as to surround the outside of the movable spline shaft  20  and to be movable by a vertical sliding motion. To this end, the second spline  31  positioned at an inner circumference of the bevel cut depth controlling unit  30  is structured to be connected to the first spline  21  of the movable spline shaft  20  by a spline. 
     Therefore, the bevel cut depth controlling unit  30  alone is smoothly movable vertically, and upon the rotational operation, the movable spline shaft  20  and the bevel cut depth controlling unit  30  are operatively and integrally connected to each other and rotate. 
     The guide groove  32  in a round shape is formed on a top of the bevel cut depth controlling unit  30 . When a lower end of the spring housing  40  is inserted into the guide groove  32 , a locking member  1  passes through the spring housing  40  and is connected to an upper end of the movable spline shaft  20  by a screw, so that the spring housing  40  is maintained to be integrally attached to the upper end of the movable spline shaft  20 . 
     The elastic spring  50  is interposed between the inner surface of the spring housing  40  and the guide groove  32  of the bevel cut depth controlling unit  30 . Accordingly, at the moment of releasing the bevel cut depth controlling unit  30  which has been pulled upwardly, the bevel cut depth controlling unit  30  automatically moves downwardly by elasticity and returns to its original state. 
     A plurality of securing openings  60  are formed at a lower part of the bevel cut depth controlling unit  30 . The securing openings  60  are equally spaced from each other in a circumferential direction. A plurality of location setting pins  70  are positioned at an upper outer part of the spline shaft connection unit  11  in a circumferential direction. The location setting pins  70  are selectively fit into the securing openings  60 . 
     The location setting pin  70  includes a screw part  71  formed at its lower part. The screw part  71  is structured to be connected to a screw hole  72  formed on an upper outer part  15  of the spline shaft connection unit  11 . At the moment when the location setting pin  70  is selectively fit into the securing opening  60 , the bevel cut depth controlling unit  30  stops rotating and simultaneously the location is fixed. Accordingly, the depth of bevel cut which is set by the bevel cut depth controlling unit  30  is automatically locked and maintained. In this manner, the depth of bevel cut is more easily controlled by a one-touch method. 
     Further, the location setting pin  70  is structured to be attachable/detachable to/from the bevelling machine body  10 , instead of being integrally with the bevelling machine body  10 . Thus, when the location setting pin  70  is bent or broken since it is used for a long time, it is easily separated to be replaced. Accordingly, the convenience in maintenance and repair is provided. 
     A pair of bearing supporting protrusions  22  is vertically positioned to be spaced apart from each other around an inner centre of the movable spline shaft  20 . Each bearing  23  is stably installed in each bearing supporting protrusion  22 . The sleeve shaft  80  is rotatably installed through the bearings  23 . 
     A protrusion  81  is formed around a lower outer circumference of the sleeve shaft  80 . The protrusion  81  is retained by a lower part of each bearing  23 , thereby preventing the sleeve shaft  80  from moving up. A snap ring  82  is fit into the upper outer circumference of the sleeve shaft  80 . The snap ring  82  is secured against an upper side of each upper bearing  23  so that the sleeve shaft  80  is prevented from moving down. 
     The bearding housing  110  is fixedly inserted into a lower part of the cutter operation unit  12 . The cutter shaft  90  is rotatably installed in the bearing housing  110 . The cutter shaft  90  is integrally connected to a lower end of the sleeve shaft  80  so that the cutter shaft  90  and the sleeve shaft  80  are operatively connected to rotate together and smoothly move vertically. 
     The connection structure of the cutter shaft  90  and the sleeve shaft  80  will be described in more detail. The cutter shaft  90  is inserted into the lower end of the sleeve shaft  80 . A locking member  83  is positioned on a top of the sleeve shaft  80  and passes through the inside of the sleeve shaft  80 . The locking member  83  is connected to the cutter shaft  90  by a screw, so that the strong connection state of the cutter shaft  90  and the sleeve shaft  80  is maintained. 
     Further, since the snap ring  82  which is fit into the outer circumference of the sleeve shaft  80  intensively receives the load of the cutter shaft  90  and sleeve shaft  80 , it droops down and thus it may be separated or broken. In this case, the cutter shaft  90  is unable to smoothly rotate. Considering this problem, an unintentional detachment preventing cap  85  is fit into a top end of the sleeve shaft  80  and the locking member  83  passes through the unintentional detachment preventing cap  85 . The technology of positioning the snap ring  82  closely to a lower side of the unintentional detachment preventing cap  85  is added so that the snap ring  82  is not separated and is strongly fixed. 
     As described above, the cutter shaft  90  is structured to be integrally connected to the sleeve shaft  80  which is another constituent. However, as illustrated in  FIG. 7 , the sleeve shaft  80  and the cutter shaft  90  may be formed in a single unit, to carry out a cutter shaft  90   a  in a new concept. For the structural simplification, an upper part of the cutter shaft  90   a  is rotatably installed in the movable spline shaft  20  and a lower part thereof is rotatably installed in the bearing housing  110  inserted into the lower part of the cutter operation unit  12 . 
     In the bearing housing  110  stably supporting only the cutter shaft  90  or  90   a  to be rotatable, bearings  112  are each fit above and under a spacer  111  inserted into an inner centre of the bearing housing  110 . Each of the bearing  112  as fit above the spacer  111  is secured by a bearing supporting protrusion  113  formed at the bearing housing  110 , so that the bearing  112  is prevented from unintentionally separating upwardly. A stopper  115  rotatably surrounding the cutter shaft  90  or  90   a  is fit into a lower end of the bearing housing  110 , so that the bearing  112  is prevented from being unintentionally detached downwardly. 
     Therefore, the cutter shaft  90  or  90   a  is stably and rotatably supported by a pair of the upper and lower bearings  112 . 
     According to the present invention in the above-described constitution, when the bevel cut depth controlling unit  30  is pulled upwardly to rotate as illustrated in  FIGS. 3 and 4 , the bevel cut depth controlling unit  30  and the movable spline shaft  20  rotate and simultaneously move vertically and the cutter shaft  90  integrally connected to the movable spline shaft  20  moves, thereby making it possible to fast and easily control the depth of bevel cut. At the moment when the bevel cut depth controlling unit  30  is released, the location fitting pins  70  are fit into the securing openings  60  of the bevel cut depth controlling unit  30 , thereby automatically locking the depth of bevel cut being accurately set by a calibrated setting. Accordingly, it is obvious that the depth of bevel cut is easily controlled by the one-touch method. 
     In accordance with the present invention, at the moment when the bevel cut depth controlling unit is released after it is operated to rotate, the location setting pins are fit into the securing openings of the bevel cut depth controlling unit and the depth of bevel cut according to an operator&#39;s selection is accurately controlled by a calibrated setting and simultaneously the bevel cut depth as set is automatically locked and maintained, thereby more easily controlling the depth of bevel cut by a one-touch method. 
     Further, the depth of bevel cut is controlled by pulling the bevel cut depth controlling unit upwardly in the opposite direction to the cutter, thereby blocking the contact of the operator&#39;s hand with the cutter and thus efficiently preventing the operator&#39;s hand from being injured. This secures high safety. In addition, since the main constitution according to the control of the depth of bevel cut is simple, the beveling machine is easily manufactured and the size of the beveling machine is minimized. 
     Furthermore, the depth of bevel cut is controlled as the cutter shaft moves vertically when the bevel cut depth controlling unit is operated. Therefore, the depth of bevel cut is immediately and fast controlled even during operation, regardless of the rotational operation of the cutter. This provides speed and convenience. 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.