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Folding of flat sheet to exact interior height
| Details |
Inventors: Fuchs, Gilbert; Crowley, Norman; Wink, Randall;
Assignee: Evana Tool & Engineering Inc. (Evansville, IN)
Primary Examiner: Pavelko; Thomas P.
Assistant Examiner:
Attorney, Agent or Firm: Larson and Taylor
A folding apparatus and method for folding a flat sheet so that an exact interior height is provided between the two folded portions is disclosed. The flat sheet is folded about a shim having a folding edge which is rounded and which has a thickness corresponding to the desired interior height. The flat shim is positioned on the flat sheet with the edge of the shim located along the line where the fold in the sheet is to be made. Initially, the portion of the sheet away from the shim is folded approximately 90.degree. by tangential bending on the folding edge of the shim. Next, a die having a facing edge mating with the folding edge of the shim is pushed onto the folding edge of the shim. The portion of the sheet which was folded 90.degree. is thus folded onto the top of the shim to approximately 180.degree.. With this two step folding, an exact interior height adjacent the fold is provided. The method and apparatus of the present invention is conveniently used for forming flat jackets having an exact interior height. A plurality of these flat jackets can be formed by providing a plurality of forming devices on a turntable where each step of the forming process is sequentially performed. |
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DETAILED DESCRIPTION In accordance with the present invention, a folding method and apparatus is provided which folds a flat sheet so that an exact interior height adjacent the fold is provided.
The folding of the flat sheet is accomplished in two steps after a shim with a rounded edge is located on the sheet.
In the first step, the portion of the sheet extending beyond the shim is tangentially folded to approximately 90.
degree.
.
Next, a die having a facing edge which mates with the folding edge of the shim is pushed onto the shim to finish bending the portion of the flat sheet extending beyond the shim to approximately 180.
degree.
.
By use of this die, an exact interior height adjacent the fold is provided.
In a preferred embodiment, an extended portion of the die above the facing edge is used to accomplish the initial tangential bending.
According to another preferred embodiment of the invention, a method and apparatus for forming a flat jacket having an exact interior height is provided.
In this embodiment, a flat sheet having side wings is folded around a shim which is located on the flat sheet.
The shim has a number of rounded folding edges corresponding to the number of folds which need to be made to form the jacket.
The flat sheet is then folded using the two step process mentioned above along a transverse line so that a substantial portion of the flat sheet overlaps the remaining portion of the flat sheet.
The side wings provided on the flat sheet are then folded, again using the two step process on top of the prior folded portion.
The side wings are then attached to the substantial portion to complete formation of the jacket.
With this embodiment, a flat jacket having an exact interior height is provided.
Preferably, the flat sheet is made of a plastics material and the dies are heated so that the folded portions of the sheet are also heated.
This heating helps the folded portions to retain their folded shape.
In still another preferred embodiment of the present invention, an apparatus is provided for forming a plurality of flat jackets using a plurality of forming devices
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