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US 4,396,379 AGranted
Thermoplastic bag stacking apparatus
AssigneeFMC Corporation
InventorsDaniel A. White, Dale W. Davis, Robert C. Faison
Life of this patent
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AssigneeFMC Corporation
InventorsDaniel A. White, Dale W. Davis, Robert C. Faison
Estimating the term…
Disclosed is a stacking device associated with a bag making machine for producing bags from thermoplastic material. The device includes a stacking station at which successive bags are accumulated in a registered pile. Creation and maintenance of a registered stack is achieved by sequentially operable clamping bars being operationally related such that at least one bar is always in contact with the bag stack as it is being accumulated. On completion of a stack, which is determined by a conventional machine cycle counter, a longitudinally travelling clamp arrangement moves the stack away from the stacking station. The disclosed device is particularly suitable to process high density polyethylene.
A bag stacking apparatus for accumulating web segments of equal length severed from an intermittently advanced web strip so that the respective edges of the segments assume substantially even-edged relationship, said stacking apparatus comprising a support located below the feed path of the web strip, and means including clamping means alternatively forceably engageable with said support and moveable above and below the feed path of the web strip for clamping the web strip and the resulting severed web segments to said support.
A bag stacking apparatus for accumulating bags produced from an intermittently advanced web strip being severed and sealed at equally spaced longitudinal intervals to thereby produce bags of equal dimensions, said apparatus comprising means for severing and sealing the web during the period when its advance is interrupted, means for clamping and retaining successive web portions extending beyond said severing and sealing means, and means for conveying an accumulated group of web portions retained by said clamping means a distance less than the length of said web portions so that a subsequent group of accumulated web portions partially overlie the conveyed group of web portions.
A bag stacking apparatus driven by and synchronized with an intermittent motion bag machine operable to feed equal increments of thermoplastic web material between a sealing and severing mechanism being effective to sever and seal the web increment located therebetween during that portion of an operating cycle when web feeding is momentarily arrested, said apparatus comprising:
A bag stacking apparatus operatively connected to an intermittent motion bag machine for producing thermoplastic bags comprising bag stacking means for accumulating bags at a stacking station until a predetermined number of bags are accumulated at said stacking station, and means for supporting, clamping and transporting a completed stack away from said stacking station so that a subsequent stack may be produced, said bag stack accumulating means comprising a platform located below the path in which the thermoplastic web is advanced by the bag machine, a linear actuator supporting and upwardly biasing said platform, reciprocating clamping bars alternatively moveable above and below the path of web advance and in forceable contact with platform, said reciprocation being phased so that at least one of said clamping bars is always in contact with the platform and the bags collected thereon, each of said clamping bars being reciprocated by connecting rods pivoted to cam operated rocking levers, said bag stack supporting, clamping and transporting means comprises a table formed with a plurality of transversely spaced elongate slots and being located adjacent said bag stack accumulating means so that a portion of the first and subsequent bags defining a stack is supported on said table, a transverse reciprocable beam overlying said table, linear actuators connected to each end of said beam and being effective to lower said beam in forceable contact with one or more bag stacks supported on said table, a platen in opposed relation to said beam and including a plurality of spaced plates moveable through the slots in said table, a linear actuator operable concurrently with said actuators effecting lowering of said beam to project said platen through said slots and thus clamp a completed stack above the surface of said table, and another linear actuator connected to said platen for translating the clamped bag stack longitudinally of said table.
Dependencies are inferred from the claim text.