Automatic fast rewinder for shaftless packing film

Abstract

An automatic fast rewinder for shaftless packing film includes a body, a feeding box for containing inflated shafts, a guide passage formed in the feeding box, a pair of rotary discs, four pairs of pinching heads, a support frame for holding a large roll of packing film, plural guide wheels and a pressing wheel for pressing and move packing film of the large roll, a saw-teeth cutting unit, and a collect unit and plural inflatable shafts. In operation, the four pairs of pinching pins rotating with the rotary discs are moved orderly to pinch or release the inflatable shaft to rewound with packing film of the large roll, cut by the cutting unit, then dropped down on the collect unit. So the finished small rolls with the inflated shafts have inflated shaft deflated and pulled out so the finished small roll becomes a small roll without a winding shaft.

1 . (canceled) 
     
     
         2 . An automatic fast rewinder for shaftless packing film comprising:
 a body ( 2 ), a support frame ( 20 ), plural guide wheels ( 21 ), a pressing wheel ( 22 ), a feeding box ( 3 ), a pair of rotary discs ( 4 ), a saw-teeth cutting unit ( 5 ), a collect unit ( 7 ) and plural inflatable shafts  7 ; wherein   the support frame ( 20 ) is positioned on the body ( 1 ) for holding a large roll of packing film;   the plural guide wheels ( 21 ) and the pressing wheel ( 22 ) are arranged orderly on the body ( 2 ) and rotated to move the packing film from the large roll held on the support frame  20 ;   the feeding box ( 3 ) is placed on the body ( 2 ) for containing a number of the inflatable shafts ( 7 ) in inflated condition, provided with a guide passage ( 30 ) extending down from one side of a bottom thereof for the inflated shafts ( 7 ) to orderly fall down, and a stopper ( 31 ) fixed at a lower end of the guide passage ( 30 ) for stopping a lowest inflated shaft ( 7 );   the pair of rotary discs ( 4 ) is installed to face each other and separated by a distance longer than a length of the inflatable shaft  7  under the guide passage  30  and four pairs of pinching heads  40  movably fitted through the pair of rotary discs  4  equidistantly spaced apart around the rotary discs  4  for being moved inward and outward to pinch and release the inflated shaft  7  remained at the stopper by means of a moving unit and rotating together with the rotary discs  4  at the same time;   the saw-teeth cutting unit  5  is located at one side of the rotary discs  4  for cutting off packing film of a large roll after rewound on the inflated shaft  7  and the inflated shaft  7  with the wound packing film becomes a small roll of packing film with the inflated shaft  7 ;   the collect unit  6  is located to extend from under the rotary discs  4  to an outside of the body  2  for collecting the small packing film rolls after released from the pair of pinching heads  40 ;   each inflatable shaft  7  is provided with a rubber cover  70  round its outer surface and to be inflated for use and deflated after the small roll of packing film is finished;   wherein in using, a number of the inflatable shafts  7  are in advance inflated, and then placed in the feeding box  3 ; the inflated shafts  7  therein then naturally fall orderly in the guide passage  30  to let the lowest one reach the stopper  31  and stopped there; then the lowest inflated shaft  7  is aligned to a first pair of the pinching heads  40 , which are then moved inward to pinch two ends of that first inflated shaft  7  at a first position just under the stopper tightly between the pair of the rotary discs  4 , and the rotary discs  4  are subsequently to be rotated through 90 degrees, to carry the first pair of the pinching heads  40  together with the first inflated shaft  7  to contact with one side of the last guide wheel  21 , with a second pair of the pinching heads  40  rotated at the same time to the first position just under the lower end of the guide passage  30  and moved inward to pinch another inflated shaft  7 , next, the inflated shaft  7  at a second position, or at the side of the last guide wheel  21  is to be wound with the packing film of the large roll moved by the guide wheels  21 ; then the rotary discs  4  are rotated again through 90 degrees to move the small picking film roll just finished rewinding to a third position that is opposite to the first position, with the packing film of the large roll pulled and with the saw-teeth cutting unit swinging upward to cut the packing film off the large roll, then the finished small packing film roll of the first inflated shaft  7  is released from the pair of the pinching heads  40  that is moved outward by the moving unit, and drops down on the collect unit  6 ; and then the inflated shaft  7  is deflated to enable it pulled off, finishing making four small packing film rolls with no winding shaft by one round of full rotation of the rotary discs  4 , speeding up operation of rewinding the large roll into plural small rolls of the packing film (a) without a shaft; in this way, finished small packing film rolls need no winding shafts; saving a lot cost of and being very effective for protecting the environment by reusing the inflatable shafts.