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LS 280 Linear Assembly System is the key to Advanced Cylinder Lock Production

Company: WEISS North America
LS 280 linear assembly system from Weiss North America Inc

The LS 280 system is proven in a myriad of market applications including pharmaceutical packaging, medical device, automotive parts and assemblies, electrical connectors, pad printing/decoratiing, battery assembly, light bulb/LED assembly, amongst others−making it versatile option for Aumat‘s lock assembly dillema.

Paired pallet “trains” on four rollers run free of backlash on a hardened and ground V shaped guideway.  The pallet engages in a friction grip, and a guide shoe runs on a toothed belt in the conveyor sections and on a rotating disc at the corners.
Essential to the LS 280 linear assembly system‘s performance are the locking stations.  Actuated by a cam drive, they are tried and tested thousands of times on the indexing tables from Germany.  Approaching smoothly on the conveyor section regulated by a frequency inverter, the workpiece carriers wait for the next timed stroke at the infeed on the transport cam, whose modified sinusoidal contour safeguards a very gentle and smooth movement at the pallet. 
The workpiece is then transported and interlocked in one movement−with no lengthy stopping, raising, and positioning as with conventional transfer systems.  After just one rotation of the transport cam, the pallet assumes the next position quickly, securely, and precisely.
By essentially “cutting up” an indexing table, the end result is a transport system that combines the advantages of an indexing table – short cycle times, high positioning precision, and gentle ramp up – with the flexibility and the space of a linear transfer system.
  • 12 m long, straight system with two corners.
  • 15 processing stations, and 42 circulating pallets.
  • A paternoster feeds pallets each with ten key / lock pairs.
  • Cylinder locks run through the plant at a rate of 360 units an hour.
At a manual workstation, the locks are fitted in the receiver on the workpiece carrier/pallet. The large number of variants makes automating this operation difficult. While the locks are being assembled, the keys remain in the pallets. An RFID system, monitoring data media on each workpiece carrier, retains the overview and informs the robot at the end of assembly which lock belongs to which key.
The circulating pre-assembled cylinder locks are then measured with a laser, fitted with their pins and springs, examined with optical equipment, and pressed with plugs. Stationary cam followers fitted to the bottom of the system support the product devices on the workpiece carrier plates to absorb the vertical process forces.
For Aumat, this “long” indexing table was ultimately the key to its “space vs. time” problem−with the workpiece changing time of just about half a second providing optimal efficiency.  Work could now begin on finalizing Aumat‘s cylinder lock assembly plant.

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