Abstract:
An improved cutter set for heat shrink film sleeve labeling machine mainly includes a cutter adjustment block which has a plurality of screw bores formed at the bottom side thereof and two opposite troughs formed at a lower section in a stepwise manner for fastening respectively a cutter therein. Each cutter set has two sets of cutter thereby may shorten cutting displacement and perform cutting of the shrink film sleeve synchronously for producing an even and neat slit opening at a fast speed steadily. Changing of the cutter may be done conveniently and rapidly by loosening various screws.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    This invention relates to an improved cutter set for heat shrink film sleeve labeling machine that enables the cutter be adjusted and replaced rapidly and conveniently for enhancing slitting operation efficiency.  
           [0002]    The commonly used cutter set for heat shrink film sleeve labeling machine (as shown in FIG. 1) constitutes a central strut  9  surrounding by a stationary frame  90 . The frame  90  has a plurality of cutter sets  91  disposed therein in an equally spaced fashion. Each cutter set  91  has an upper end engaged with a transmission disk  92 . One cutter set  91 ′ engages with a transmission wheel  93  which is driven by a belt  94  for rotating the cutter set  91 ′ and consequently drives the transmission disk  92  rotating eccentrically thereby drives the cutter sets  91  rotating to perform slitting operation. The cutter sets  91  and  91 ′ (as shown in FIG. 2) includes a crank shaft  95 , three sets of bearing  950 ,  951  and  952 , a connection member  96 , a cutter protractor plate  960 , an anchor block  97 , a cutter adjustment block  98 , a cutter  980  and a fastening plate  99 . When to adjust the cutter set  91 , the screws P 1 , P 2 , and P 3  must be loosened. It is a tedious process. Moreover, each cutter set  91  should be rotated 360 degree for doing the second time slitting operation. It is not efficient and results in waste of operation time  
         SUMMARY OF THE INVENTION  
         [0003]    It is therefore an object of this invention to provide an improved cutter set for heat shrink film sleeve labeling machine that has a cutter adjustment block with two stepwise opposite troughs and screw bores formed at the bottom side thereof for fastening cutters thereby to shorten cutting displacement and perform slitting operation at a fast and steady speed and is capable of changing cutter rapidly and conveniently. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0004]    The invention, as well as its many advantages, may be further understood by the following detailed description and drawings, in which:  
         [0005]    [0005]FIG. 1 is a schematic sectional view of a conventional cutter set.  
         [0006]    [0006]FIG. 2 is an exploded view of a conventional cutter set.  
         [0007]    [0007]FIG. 3 is a schematic sectional view of this invention.  
         [0008]    [0008]FIG. 4 is an exploded view of this invention.  
         [0009]    [0009]FIG. 5 is an exploded view of this invention coupling with a transmission wheel.  
         [0010]    [0010]FIG. 6 is a perspective view of this invention.  
         [0011]    [0011]FIG. 7 is a perspective view of a cutter adjustment block of this invention.  
         [0012]    [0012]FIG. 8 is a schematic view of the cutter sets driven by a transmission disk.  
         [0013]    [0013]FIG. 9 is a schematic view of two neighboring cutters in motion. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0014]    Referring to FIG. 3 for an embodiment of this invention, the cutter set includes a central strut  10  surrounding by two stationary frames  11  and  12 . In the frames  11  and  12 , there are disposed a plurality of cutter sets  2  and  2 ′ in an annular and equally spaced fashion. The cutter set  2  and  2 ′ have respectively an upper end engaged with a transmission disk  3  which has a plurality of bores  30 . One cutter set  2 ′ engages with a transmission wheel  4  which is driven by a belt  5  for rotating the cutter set  2 ′, and subsequently drives the transmission disk  3  rotating eccentrically and driving the cutter sets  2  rotating to perform slitting operation. The cutter sets  2  and  2 ′ (as shown in FIGS. 4 and 5) include respectively a crank shaft  20 , three sets of bearing  21 ,  22  and  23 , a connection member  24 , a cutter protractor plate  25 , an anchor block  26 , a cutter adjustment block  27  and two pieces of cutter  28 . The crank shaft  20  has a shaft stem  200  at an upper portion in an eccentric manner. The shaft stem  200  has an annular groove  201 . At the bottom end of the crank shaft  20 , there is a cavity  202  with a screw bore  203  formed inside the crank shaft  20 . The bearing  21  is mounted on the shaft stem  200  and is fastened to the shaft stem  200  securely by means of a C type snap ring  210  engaged to the annular groove  201 . The perimeter surface of the bearing  21  has two annular grooves  211  engaged respectively with a snap ring  212  for holding the bearing  21  in the bore  30  of the transmission disk  3 . The bearings  22  and  23  are mounted on the crank shaft  20  and being held in the frames  11  and  12 . The connection member  24  is fastened to a lower end of the crank shaft  20  through a screw N. The connection member  24  has a bulged stub  241  at the upper side to engage with the cavity  202  of the crank shaft  20  and a protrusive ring  241  at a lower side with a sinking bore  242  formed therein for the screw N to pass through. The connection member  24  further has two screw bores  243  at the bottom side for engaging with screws N 1  to fasten the cutter protractor plate  25  through two sinking bores  251  located at two sides of a through opening  250  formed at the center of the cutter protractor plate  25 . The cutter protractor plate  25  has same number of protracting screw bores  252  as the cutter sets  2  and  2 ′ for adjusting the mounting angle of the cutter  28 . The anchor block  26  is fastened to the cutter protractor plate  25  through screws N 2  at selected screw bores  252  according to the desired adjusting angle of the cutter  28 . The anchor block  26  has a recess  260  at an upper section for holding the cutter protractor plate  25  and a trough  261  at a lower section with two screw bores  262  formed therein, and two screw bores  263  formed at the bottom thereof at two opposite sides. The cutter adjustment block  27  has two screw bores  270  formed at the bottom side to engage with the screw bores  263  through screws N 3  for fastening the cutter adjustment block  27  to the lower end of the anchor block  26 . The cutter adjustment block  27  further has two opposite troughs  271  and  271 ′ at the lower section formed in a stepwise manner. There are screw bores  272  formed respectively at the front end at two sides of the troughs  271  and  271 ′. In the troughs  271  and  271 ′, there are a plurality of fastening apertures  273 . The cutter  28  has fastening apertures  280  engageable with the fastening apertures  273  through screws N 5  for fastening the cutter  28  to the troughs  271  and  271 ′. And through flat screws N 4  engaging with the screw bores  272 , the cutter  28  may be positioned by means of the circumference of the flat screws N 4 . Each cutter set  2  is constructed by means of aforesaid structure (as shown in FIGS. 6 and 7). Then the cutter sets  2  and  2 ′ may be mounted on the frame  11  and  12  with the cutter  28  pointing toward the annular groove  100  of the strut  10 . The crank shaft  20  of one cutter set  2 ′ (shown in FIG. 5) engages firmly with the transmission wheel  4  through a key  40  held in a key way  204  formed on the crank shaft  20 . Hence the transmission wheel  4  and belt  5  can drive the cutter set  2 ′ rotating.  
         [0015]    When the belt  5  drives the transmission wheel  4  rotating, the crank shaft  20  of the cutter set  2 ′ is driven and rotated, and also drives the cutter set  2 ′ rotating. Through the eccentric shaft stem  200  and transmission disk  3  (by crank shaft transmission principle), the cutter sets  2  and  2 ′ will rotate synchronously to perform slitting operation on the shrink film sleeve (as shown in FIG. 8). As each cutter set  2  has two sets of cutter  28  in opposite direction, the cutting displacement may be shortened and slitting of the film sleeve will be done synchronously. As a result, the slit opening is neat and even, and the cutting speed is fast and steady. Furthermore, as two sets of the cutter  28  are mounted at different step levels rather than at the same plane (shown in FIG. 9), the cutters  28  won&#39;t hit against each other. When replacing the cutter  28  is desired, it may be done simply by loosening the flat screws N 4  and fastening screws N 5 . When there is a need to adjust the length of the cutter  28 , fasten the screw N 5  through the fastening apertures  280  of the cutter  28 , and engage the screw N 5  in different apertures  273  of the troughs  271  and  271 ′. It may be done conveniently and rapidly, and save adjusting time.  
         [0016]    While the preferred embodiment of the invention has been set forth for purpose of disclosure, modifications of the disclosed embodiment of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.