Patent ID: 6467243
Filing Date: 2002-10-22
Classification: B65B

Abstract:
A strapping machine for strapping a package, comprising:a machine body defining an accommodating space and a package-strapping space above said accommodating space; a strap supply reel mounted on said machine body and adapted to hold a bundle of strap thereon; a strap feed unit capable of feeding the strap from said strap supply reel to said package-strapping space; a rotating shaft unit journalled in said accommodating space, and formed with a cam unit; a strap tightening adjustment unit including a spring-loaded swing arm pivoted to said machine body within said accommodating space and associated with said rotating shaft unit via said cam unit in such a manner that rotation of said shaft unit results in turning of said swing arm relative to said machine body between an upper position adjacent to said package-strapping space and a lower position distal from said package-strapping space, said swing arm defining a strap passage adapted to permit extension of the strap therethrough, an electrically operated clamp unit mounted movably on said swing arm and movable relative to said strap passage between a clamping position, in which the strap is clamped by said clamp unit, and a releasing position, in which the strap is released from said clamp unit, a detecting device, and a delay circuit electrically coupled to said detecting device and said clamp unit, wherein, when said detecting device detects a first position of said swing arm between said upper and lower positions, said delay circuit will actuate said clamp unit to move from said releasing position to said clamping position after a preset delay time, and wherein, when said detecting device detects a second position of said swing arm between said first and lower positions, said clamp unit is immediately actuated to move from said clamping position to said releasing position.