Apparatus for measuring restoring force necessary for raising folded portions of hard paper boxes

An apparatus for measuring a restoring force necessary for raising folded portions of a hard paper box, comprising

• a framework;
• a base plate for disposing thereon a hard paper box having ruled folded line edges formed between small and large portions and slidably supported by said framework and including a plurality of suction nozzles each extending through said base plate and opened at the top surface thereof;
• means for adjusting the position of said base plate;
• a hollow rotary wing including a base surface for sandwiching a folded box between said base surface and the base plate, an interior space, a plurality of suction holes formed in the base of said wing and a hollow center shaft rotatably supporting said wing at that center of said wing which makes contact with a hard paper box to be tested and having a suction tube extended therethrough and communicated with said interior space;
• a vacuum supply source communicated with said suction nozzles of said base plate on the one hand and with said suction holes of said hollow rotary wing on the other hand;
• means for rotating said hollow rotary wing, comprising a semi-circular gear made integral with said hollow rotary wing and vertically projecting therefrom and a rack divided into two portions, the upper portion being slidably supported by said framwork and the lower portion being secured to said framework;
• and
• a detector means for detecting a force necessary for rotating said hollow rotary wing, including means for detecting a difference between a force for rotating said hollow rotary wing under no load condition and a force for rotating said hollow rotary wing under a loaded condition, said detector means comprising a piezoelectric element, a strain gauge or the like sandwiched between said two portions of said rack and connected through an amplifier to a recorder.

An apparatus for measuring a restoring force necessary for raising folded portions of a hard paper box, comprising

• a framework;
• a base plate for disposing thereon a hard paper box having ruled folded line edges formed between small and large portions and slidably supported by said framework and including a plurality of suction nozzles each extending through said base plate and opened at the top surface thereof;
• means for adjusting the position of said base plate;
• a hollow rotary wing including a base surface for sandwiching a folded box between said base surface and the base plate, an interior space, a plurality of suction holes formed in the base of said wing and a hollow center shaft rotatably supporting said wing at that center of said wing which makes contact with a hard paper box to be tested and having a suction tube extended therethrough and communicated with said interior space;
• a vacuum supply source communicated with said suction nozzles of said base plate on the one hand and with said suction holes of said hollow rotary wing on the other hand;
• means for rotating said hollow rotary wing, comprising a semi-circular gear made integral with said hollow rotary wing and vertically projecting therefrom and a rack divided into two portions, the upper portion being slidably supported by said framework and the lower portion being secured to said framework, and
• a detector means for detecting a force necessary for rotating said hollow rotary wing, said detector means comprising a pressure sensitive element located between said two portions of said rack, and a recorder coupled to said pressure sensitive element for recording said difference between forces.