Pushing mechanism and box packaging device

Abstract

A pushing mechanism pushes a plurality of bags into a laterally open box in an erected posture. The pushing mechanism includes a box standby unit for causing the box to stand by, an article placement unit having a placement surface on which the plurality of bags are temporarily placed in the erected posture, and a pushing unit extending in an alignment direction of the plurality of bags and pushing the plurality of bags placed on the placement surface into the box by moving toward an opening of the box from the article placement unit. The pushing unit has a contact portion that comes into contact with a portion of the bag in a height direction in the erected posture such that one side of the bag is bent in a pushing direction.

What is claimed is: 
     
         1 . A pushing mechanism that pushes a plurality of bags formed by sealing both end portions of a film formed in a tubular shape into a laterally open box in an erected posture, the pushing mechanism comprising:
 a box standby unit for causing the box to stand by;   an article placement unit having a placement surface on which the plurality of bags are temporarily placed in the erected posture; and   a pushing unit extending in an alignment direction of the plurality of bags and pushing the plurality of bags placed on the placement surface into the box by moving toward an opening of the box from the article placement unit,   wherein the pushing unit has a contact portion that comes into contact with a portion of the bag in a height direction in the erected posture such that one side of the bag is bent in a pushing direction.   
     
     
         2 . The pushing mechanism according to  claim 1 ,
 wherein the contact portion protrudes in a pushing direction of the pushing unit pushing the bag from a pressing surface on which the pushing unit pushes the plurality of bags, and   a protruding height of the contact portion is larger than 1/10 of a length of the bag in the pushing direction, and is smaller than ⅓ of the length of the bag.   
     
     
         3 . The pushing mechanism according to  claim 1 , further comprising:
 a raising and lowering unit that raises and lowers the box standby unit,   wherein the pushing unit pushes the plurality of bags into the box lowered by the raising and lowering unit again after the plurality of bags are pushed into the box.   
     
     
         4 . The pushing mechanism according to  claim 1 ,
 wherein the contact portion is provided to be expandable and contractible in the alignment direction of the plurality of bags.   
     
     
         5 . The pushing mechanism according to  claim 1 ,
 wherein one side of the bag bent by the contact portion corresponds to any one edge side of a pair of seal portions provided in both end portions of the bag.   
     
     
         6 . The pushing mechanism according to  claim 1 ,
 wherein the contact portion comes into contact with a central portion of the bag in the height direction in the erected posture, and   one side of the bag pushed into the box on an opening side of the box is made to bent so as to enter an inside of the box when viewed in the alignment direction of the plurality of bags.   
     
     
         7 . A box packaging device comprising:
 a transport mechanism that sequentially transports the bags one by one;   an accumulation mechanism that accumulates a predetermined number of the bags; and   the pushing mechanism according to  claim 1 , which pushes the predetermined number of the bags into the box.