|
(11) | EP 1 052 034 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
|||||||||||||||||||||||
| (54) | Sheet metal folder, controller and method |
| (57) A sheet metal folder includes a movable fold bar, an actuator to move the movable
fold bar and a sheet position monitor which monitors the position of the folded portion
of a sheet being folded. During folding, a controller moves the fold bar to a first
fold position and retreats the fold bar to a position in which the sheet is no longer
contacted by the fold bar. The current position of the sheet is then registered. A
second fold position is calculated using the difference between the first fold position
of the fold bar and the registered position. The fold bar is then moved to the second
fold position. The sheet position monitor may involve a detector detecting the presence
of a folded part of the sheet against the fold bar, with the current position of the
sheet after the fold bar is retreated being registered by registering the position
of the fold bar immediately the sheet no longer resides against the fold bar. |