초록 ▼

An apparatus for packaging a substance in closed bags formed from two continuous ribbons of a thin fragile material in which the ribbons are sealed to each other as they pass downwardly between first and second pairs of horizontal nipping rollers. A bag open at the top is produced from a portion of

An apparatus for packaging a substance in closed bags formed from two continuous ribbons of a thin fragile material in which the ribbons are sealed to each other as they pass downwardly between first and second pairs of horizontal nipping rollers. A bag open at the top is produced from a portion of the ribbons by sealing and is filled with a predetermined amount of the substance to be packaged. The top of the bag is subsequently sealed to close the bag after the ribbons have advanced downwardly a predetermined distance. These operations take place sequentially on successive portions of the ribbons as they advance toward the second pair of nipping rollers, forming a series of sealed bags. At least one of the first pair of nipping rollers has a generally smooth annular concave portion extending between the end portions thereof, while at least one of the second pair of nipping rollers has a generally cylindrical portion of reduced diameter extending between its end portions. Rotation of the rollers about their respective axes is controlled to advance the ribbons in a desired manner. The two ribbons approach the first pair of rollers generally horizontally from opposite sides. They pass over and partially around the rollers to the point of nipping engagement, from which they proceed downwardly toward the second set of rollers. The portions of the two ribbons above the first pair of rollers are tensioned away from those rollers to pull the ribbons into the concave portions, preforming the ribbons at that point and for a substantial distance therebelow into a generally tubular shape. A conduit for introducing the substance to be packaged into each of the open bags extends downwardly between the first pair of rollers.

대표청구항 ▼

Apparatus for packaging a substance in closed bags formed from two continuous ribbons of a thin, fragile material comprising: first and second rollers directed along a first horizontal plane and circumferentially engageable in opposed nipping relationship at axially outer end portions thereof to con

Apparatus for packaging a substance in closed bags formed from two continuous ribbons of a thin, fragile material comprising: first and second rollers directed along a first horizontal plane and circumferentially engageable in opposed nipping relationship at axially outer end portions thereof to confine two ribbons therebetween, at least one of said rollers having a generally smooth annular concave portion extending between said end portions, the two ribbons approaching said first and second rollers generally horizontally from opposite sides thereof with each of the ribbons passing over and partially around one of said rollers to a first location between said rollers, whereupon the ribbons are brought face to face with one another and nipped in that condition between the axially outer end portions of said first and second rollers; third and fourth rollers directed along a second horizontal plane and spaced beneath said first and second rollers, said third and fourth rollers circumferentially engageable in opposed nipping relationship at axially outer end portions thereof with at least one of said rollers having a generally cylindrical portion of reduced diameter extending between said end portions thereof, the ribbons passing downwardly from said first and second rollers to a second location at which the ribbons are nipped between the axially outer end portions of said third and fourth rollers; means for controlling the rotation of said rollers about their respective axes to advance the ribbons in a desired manner from said first location to said second location as the ribbons are held taught therebetween; means for tensioning the two ribbons above said first location in a direction away from said first location, pulling each of the ribbons over a different one of said first and second rollers and pulling at least one of the ribbons into said at least one concave portion to preform the unsealed combination of the ribbons at said first location and for a substantial distance therebelow into a generally tubular shape; means for sealing the ribbons to each other as the ribbons pass from said first location to said second location, forming a bag open at the top from a portion of the ribbons and subsequently sealing said top to close the bag after the ribbons have advanced a downwardly predetermined distance, said sealing means operating on successive portions of the ribbons as the ribbons advance toward said second location to form a series of sealed bags; and means for introducing a substance directly into each of the open bags, comprising a conduit extending downwardly between said first and second rollers in the space formed by said at least one concave portion, said conduit located between and generally spaced from the preformed ribbons to prevent damage thereto, and means for causing a predetermined amount of the substance to pass from said conduit to each of the bags between the time of bag formation and that of sealing.