Mode of operation
Depending on the board length, the material stack is appropriately positioned on the lift table. For example, on a Schelling cut-to-size saw with cutting length 4300 mm, a half-format board (2800 x 2070 mm) is pushed off the material stack at a distance of about 1300 mm from the side aligning fence.
Cutting pattern without head cuts
In cutting patterns without head cuts, the longitudinal strips are processed according to the cutting pattern and then pushed out onto the air floatation tables. Due to the distance from the side aligning fence, the operator has enough room to turn the strips 90° for the cross cut cycle.
Cutting pattern with head cuts
In cutting patterns with head cuts, the book is pushed off the material stack by means of an optional separate push-off carriage, or the feeder, and is transported to the turning frame. If the book consists of half-format boards, it is placed off-center and the location is measured by a side mounted sensor to determine its position on the turning frame. The turning frame lifts the book and it is turned 90° by using a motor. The turning speed depends on the book height and is regulated automatically. Before turning, the feeder drives to the position where it will take over the book, this position was already defined by the previous measuring process. As a consequence, the creep speed distance the feeder has to travel to take over the book remains consistently very small and is optimized for differing board lengths. This enables short cycle times.
After aligning the turned book against the book aligners, the clamps close and position the book for the first head cut.
The head part is pushed off onto the air floatation tables behind the saw and can already be positioned against the side aligning fence by the operator.
The HANDLING PLUS+
The main part is pulled backwards by the feeder and is accurately positioned on the turning frame by the control program. The position for the main part is chosen depending on the size of the head part. This allows the main part to be cut into longitudinal strips after being turned 90° without the possibility of running into the head part that is waiting at the side aligning fence.The distance between the head part and the longitudinal strips of the main part can be set by a software parameter. For this reason, the operator has a working area between the head part and main part. For example, see depiction 5 that shows half format boards on a machine with a cutting length of 4300 mm. This allows the operator to easily push the head part into the clamps without additional handling and start the cross cut cycle.
Advantages
- handling is optimized by accurately positioning the boards through measurement
- turning speed dependent on book height
- short cycle times
- ideal position for the operator between head part and main part
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