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A swivel arm, bearing a vacuum frame fitted with suction cups, conveys the sheet from the loading station to the pallet changer.

With the aid of a so-called unloading fork integrated in the vacuum frame, the finished parts and scrap skeleton are transferred from the pallet changer to a platform.

Work-piece format

The loading device can handle work-pieces of various formats:

• The suction cups can be activated or deactivated by means of manual slide valves as required by the sheet format OR
  
  
• The suction cup arrangement can be modified. Step-less relocation of all suction cups to new positions simply by loosening the clamping screws.
  
  

Home position

The swivel device with the vacuum frame is located above the raw material stack. The frame and suction cups are in uppermost position, the unloading fork is extended on both sides.

Loading cycle

The suction cups are lowered to DOWN position. The vacuum frame descends, vacuum is activated and the sheet picked up (if necessary, the sheet is peeled up by activating the peel-off function and sheet thickness gauge).

• Vacuum frame ascends to uppermost position.
  
  
• Vacuum frame swings over to the pallet changer of the laser-cutting machine.
  
  
• The sheet is placed on the pallet of the pallet changer, vacuum is deactivated. A brief pressure pulse from the suction cups releases the sheet.
  
  
• Suction cups and vacuum frame ascend to uppermost position, the device swings back to home position.
  
  

Unloading cycle

Condition: A pallet holding finished parts is located in the pallet changer.

• The vacuum frame (with the unloading fork open) swings over to the pallet changer and descends until the gripping face of the fork is somewhat lower than the finished workpiece on the pallet.
  
  
• The left and right halves of the fork come together, reaching in between the support slats of the pallet, beneath the processed workpiece.
  
  
• The vacuum frame is raised and swings over to the platform for finished parts.
  
  
• The frame descends to depositing position.
  
  
• The two halves of the fork pull apart, leaving the finished workpiece on the platform.
  
  
• The vacuum frame, with the fork open, ascends and resumes its home position above the raw material stack.
  
  

Features and benefits of the LiftMaster

Simple, economical automation

Fast and safe handling of work-pieces and sheets of different sizes.

Greatly facilitates the loading of heavy sheets.

Fully automatic loading and unloading while production is running.

Allows fully automatic production to continue through breaks and shift changes.

Especially effective in conjunction with short machining times.

Large number of dissimilar work-pieces can be produced in an automatic cycle.

The operator is no longer tied to the cycle times at the machine and can assume other tasks.