Shrink packing system

Abstract

A packing unit of a shrink packing system which shortens time required for a packing process. For this purpose, the packing unit includes four supporters arranged at both sides of a transfer conveyer, two elevators combined with the four supporters so as to be upwardly and downwardly movable, and four telescopic arms combined with the two elevators so as to be movable in the moving direction of the transfer conveyer and to be extensible and retractable in the lengthwise direction.

What is claimed is: 
     
         1 . A shrink packing system, comprising:
 a transfer conveyer to transfer a product;   a feeding unit to continuously feed a shrink film;   an opening unit to receive the shrink film fed from the feeding unit and to spread the shrink film;   a packing unit to cover the product with the shrink film by moving in a direction of the product while gripping the spread shrink film; and   a shrinking unit to shrink the shrink film covering the product using hot air,   wherein the packing unit includes:   a plurality of supporters arranged at both sides of the transfer conveyer;   a plurality of elevators supported by the plurality supporters and provided so as to be upwardly and downwardly movable;   a plurality of telescopic arms combined with the plurality elevators so as to be slidable in the leftward and rightward directions, and provided so as to be extensible and retractable in the forward and backward directions; and   a plurality of clamping fingers provided at the front ends of the plurality of telescopic arms.   
     
     
         2 . The shrink packing system according to  claim 1 , wherein the shrink film is in the shape of an envelope wound on a roll. 
     
     
         3 . The shrink packing system according to  claim 1 , the plurality of supporters includes four supporters, the plurality of elevators includes two elevators, the plurality of telescopic arms includes four telescopic arms, and the plurality of clamping fingers includes four clamping fingers. 
     
     
         4 . The shrink packing system according to  claim 3 , wherein the two elevators are provided alongside the transfer conveyer. 
     
     
         5 . The shrink packing system according to  claim 3 , wherein the two elevators move upwards or downwards together. 
     
     
         6 . The shrink packing system according to  claim 3 , wherein the four telescopic arms are extended or retracted together. 
     
     
         7 . The shrink packing system according to  claim 1 , wherein, when the opening unit spreads the shrink film, the plurality of telescopic arms are extended in the forward direction, such that the clamping fingers grip the shrink film. 
     
     
         8 . The shrink packing system according to  claim 7 , wherein, after the plurality of elevators have moved downwards while the clamping fingers grip the shrink film and then cover the product with the shrink film, the telescopic arms are retracted in the backward direction. 
     
     
         9 . The shrink packing system according to  claim 8 , wherein, when the plurality of elevators move upwards while the telescopic arms are retracted in the backward direction, the transfer conveyer moves to transfer the product covered with the shrink film to the shrinking unit and to transfer a next product not covered with the shrink film to the packing unit. 
     
     
         10 . The shrink packing system according to  claim 1 , wherein:
 each of the elevators includes sliding rails provided in the lengthwise direction; and   each of the telescopic arms includes a sliding block combined with the sliding rails so as to slide in the leftward and rightward directions.   
     
     
         11 . The shrink packing system according to  claim 10 , wherein:
 each of the elevators further includes a pinion gear and a drive motor driving the pinion gear; and   each of the telescopic arms further includes a rack gear engaged with the pinion gear so as to receive driving force.   
     
     
         12 . The shrink packing system according to  claim 10 , wherein each of the plurality of telescopic arms includes a first arm member combined with the sliding block, a slide member combined with the first arm member so as to be movable in the forward and backward directions with respect to the first arm member, and a second arm member combined with the slide member so as to be movable in the forward and backward directions with respect to the slide member. 
     
     
         13 . The shrink packing system according to  claim 12 , wherein the first arm member includes a first pinion gear and a drive motor driving the first pinion gear, and the slide member includes a rack gear engaged with the first pinion gear so as to receive driving force and a second pinion gear which can be driven by the movement of the slide member, and the second arm member includes a rack gear engaged with the second pinion gear so as to receive driving force. 
     
     
         14 . The shrink packing system according to  claim 13 , wherein each of the plurality of clamping fingers is combined with each of the second arm members of the telescopic arms. 
     
     
         15 . A shrink packing system comprising:
 a transfer conveyer to transfer a product;   a feeding unit to continuously feed a shrink film;   an opening unit to receive the shrink film fed from the feeding unit and spreading the shrink film;   a packing unit comprising two elevators provided so as to be upwardly and downwardly movable, and four telescopic arms combined with the two elevators so as to be slidable in the leftward and rightward directions and provided so as to be extensible and retractable in the forward and backward directions; and   a shrinking unit shrinking the shrink film covering the product using hot air.   
     
     
         16 . The shrink packing system of  claim 15 , wherein the shrink film is in the shape of an envelope wound on a roll. 
     
     
         17 . The shrink packing system according to  claim 15 , wherein, when the opening unit spreads the shrink film, the packing unit moves downwards while gripping the shrink film under the condition that the product is stationary, covering the product with the shrink film. 
     
     
         18 . The shrink packing system according to  claim 17 , wherein, when the product is covered with the shrink film, the packing unit moves upwards and simultaneously, the product covered with the shrink film is transferred to the shrinking unit and another product not covered with the shrink film is transferred to the packing unit. 
     
     
         19 . A packing unit, comprising:
 four supporters arranged at both sides of a transfer conveyer transferring products;   two elevators supported by the four supporters and provided so as to be upwardly and downwardly movable;   four telescopic arms combined with the two elevators so as to be slidable in the leftward and rightward directions, and provided so as to be extensible and retractable in the forward and backward directions; and   four clamping fingers provided at the front ends of the four telescopic arms.   
     
     
         20 . A shrink packing system to shorten a time of a packing process, comprising:
 a packing unit to cover a product with shrink film by moving in a direction of the product while gripping the shrink film; and   a shrinking unit to shrink the shrink film covering the product using hot air,   wherein when the product is covered with the shrink film, the packing unit moves upwards and simultaneously, the product covered with the shrink film is transferred to the shrinking unit and another product not covered with the shrink film is transferred to the packing unit.   
     
     
         21 . The shrink packing system of  claim 20 , wherein when the packing unit moves upward, the four telescopic arms are fully retracted. 
     
     
         22 . The shrink packing system of  claim 20 , wherein when the packing unit moves in a downward direction to cover the product in the shrink film, then the four telescopic arms are partially extended.