Heat Shrink Device for a Bottom of a Sleeve Label

Abstract

A heat shrink device includes a front conveyor, a baker, and a rear conveyor mounted on a frame in sequence. Left and right conveyors are respectively located on two sides of the frame and are located above the front and rear conveyors. Each of the left and right conveyors gradually declines from a front end thereof towards a rear end thereof. A container wrapped with a sleeve label can be conveyed rearward by an upper run of the front conveyor. The left and right conveyors together clamp and convey the container and the sleeve label rearward. The left and right conveyors gradually push a bottom of the sleeve label beyond a bottom face of the container. The baker bakes the bottom of the sleeve label to cause the bottom of the sleeve label to heat shrink and envelope a peripheral area of the bottom face of the container.

1 . A heat shrink device comprising:
 a frame including a front end and a rear end spaced from the front end in a longitudinal direction;   a front conveyor mounted on the front end of the frame, with the front conveyor moving along an annular path and having an upper run, with the upper run of the front conveyor adapted to convey a container wrapped with a sleeve label rearward;   a rear conveyor mounted on the rear end of the frame and spaced from the front conveyor in the longitudinal direction, with the rear conveyor moving along an annular path and having an upper run, with the upper run of the rear conveyor adapted to convey the container wrapped with the sleeve label rearward;   a baker mounted between and spaced from the front and rear conveyors, with the baker including a top end having a baking opening located below front and rear conveyors in a height direction perpendicular to the longitudinal direction; and   left and right conveyors respectively located on left and right sides of the frame and located above the front and rear conveyors in the height direction perpendicular to the longitudinal direction, with the left and right conveyors spaced from each other in a width direction perpendicular to the longitudinal direction and the height direction, with each of the left and right conveyors moving along an annular path, with the left conveyor including an inner run facing the right conveyor and moving rearward, with the right conveyor including an inner run facing the left conveyor and moving rearward, and with each of the left and right conveyors gradually declining from a front end thereof towards a rear end thereof,   with a container wrapped with a sleeve label adapted to be conveyed rearward by the upper run of the front conveyor, with a bottom face of the container located on the front conveyor,   with the left and right conveyors adapted to together clamp the container and the sleeve label wrapped around the container and adapted to convey the container rearward toward the rear conveyor, and with the left and right conveyors adapted to gradually push the sleeve label downward to expose a bottom of the sleeve label beyond the bottom face of the container, and   with the baker adapted to bake the bottom of the sleeve label passing above the baking opening to cause the bottom of the sleeve label to heat shrink and envelope a peripheral area of the bottom face of the container.   
     
     
         2 . The heat shrink device as claimed in  claim 1 , with the front, rear, left, and right conveyors moving synchronously. 
     
     
         3 . The heat shrink device as claimed in  claim 1 , with each of the left and right conveyors including a support, and with the support of each of the left and right conveyors including a plurality of rollers and a transmission wheel to tension and drive a corresponding one of the left and right conveyors. 
     
     
         4 . The heat shrink device as claimed in  claim 3 , with a sliding seat pivotably mounted to each of two ends of each of the plurality of rollers of each of the left and right conveyors, with the support of each of the left and right conveyors including a plurality of guiding grooves receiving the sliding seats of a corresponding one of the left and right conveyors, and with a spring mounted in each of the plurality of guiding grooves and biasing a corresponding one of the plurality of rollers and a corresponding one of the sliding seats to tension a corresponding one of the left and right conveyors. 
     
     
         5 . The heat shrink device as claimed in  claim 3 , further comprising: a motor, a gearbox connected to the motor, and two transmission shafts connected to the gearbox, with the two transmission shafts rotating in different directions, and with the two transmission shafts connected to and driving the left and right conveyors via the transmission wheels, respectively.