초록 ▼

Packaging apparatus in which units to be wrapped and flexible packaging material for wrapping the units are fed forward with the units spaced apart in the direction of feed, with a dwell interval between successive feed cycles, and having means for forming a seal across the width of the material bet

Packaging apparatus in which units to be wrapped and flexible packaging material for wrapping the units are fed forward with the units spaced apart in the direction of feed, with a dwell interval between successive feed cycles, and having means for forming a seal across the width of the material between two successive units during each dwell interval. The units are fed forward by conveyor means intermittently driven via a chain and sprocket drive including a crank rotatable about a predetermined axis, means for continuously rotating the crank in one direction about its said axis, a first sprocket secured to the crank with the axis of the first sprocket offset from the crank axis for rotation of the first sprocket about the crank axis without rotation of said first sprocket about its own axis, a second sprocket and a chain trained around said first and second sprockets. The sealing means is operated during the dwell intervals by a similar chain and sprocket drive mechanism.

대표청구항 ▼

Packaging apparatus comprising means for feeding forward units to be wrapped and flexible packaging material for wrapping the units, with the units spaced apart in the direction of feed, means for effecting intermittent operation of the feeding means intermittently to feed forward the units and the

Packaging apparatus comprising means for feeding forward units to be wrapped and flexible packaging material for wrapping the units, with the units spaced apart in the direction of feed, means for effecting intermittent operation of the feeding means intermittently to feed forward the units and the packaging material, with a dwell interval between successive feed cycles, and means for forming a seal across the width of the material between two sucCessive units during each dwell interval, wherein said means for operating the feeding means comprises a chain and sprocket drive including a crank rotatable about a predetermined axis, means for continuously rotating the crank in one direction about its said axis, a first sprocket secured to the crank with the axis of said first sprocket offset from the crank axis for rotation of said first sprocket about the crank axis without rotation of said first sprocket about its own axis, a second sprocket connected to said feeding means, a chain trained around said first and second sprockets, said first sprocket acting to pull a reach of the chain in a forward direction to effect rotation of the second sprocket in a forward direction for driving said feed means during a first portion of a revolution of said first sprocket about the crank axis, and to discontinue [froward]forward drive of the chain during a second portion of said revolution for a feed and dwell of the feed means during each revolution of the crank, means for maintaining the chain relatively taut around said sprockets, and means driven in timed relation to said first sprocket for operating said seal forming means to form a seal as the first sprocket rotates through said second portion of a revolution.