Electric 3-Finger Centric Gripper - EZU

The brushless DC servomotor drives the three gear racks integrated in the slide-guided base jaws via a spur gear unit with rack-and-pinion principle. The spur gear unit generates an almost constant gripping force along the finger length, which remains constant even in the event of horizontal positioning errors of the workpiece or robot, thus ensuring a high error tolerance. The gripping force is generated without a minimum approach distance, which simplifies handling and speeds up the process.
An integrated absolute encoder ensures that the gripper is immediately ready for use even after an emergency stop or power failure. The gripping force maintenance, which is achieved in combination with a permanent magnet brake and a damping element in the drive train, reduces the risk of workpiece loss, which is detected by the integrated workpiece loss detection.

Advantages – Your benefits

• Flexible workpiece handling
  Cylindrical workpieces of different sizes can be handled efficiently thanks to the extensively adjustable, freely programmable jaw stroke
• High fault tolerance
  The drive train ensures a constantly high gripping force even in the event of horizontal positioning errors of the workpiece or robot
• Increased efficiency
  No start-up distance is required for gripping, which simplifies handling and speeds up the overall process
• High robustness
  The sealed design with the proven sliding guide makes the gripper resistant to harsh operating conditions
• Particularly reliable
  The risk of workpiece loss is minimized thanks to the integrated gripping force maintenance with loss detection
• High availability
  The integrated absolute encoder ensures permanent referencing, even in the event of an emergency stop or power failure
• Easy integration
  The integration effort is significantly reduced thanks to a wide range of communication interfaces, PLC function blocks and robot plug-ins compatible with leading manufacturers

Options and special information

• Gripping modes
  The BasicGrip and StrongGrip gripping modes are available. With BasicGrip continuous operation of the motor and thus permanent re-gripping of the workpiece is possible. The gripping speed is automatically optimized for gripping force adjustment. With StrongGrip, the maximum gripping force is generated and then stored by the gripping force maintenance. Permanent regripping is possible within an adjustable time frame. In addition, defined pause times and maximum ambient temperatures must be taken into account in StrongGrip mode. Further details can be found in the operating manual.
• Gripping force maintenance
  In the event of an emergency stop or a voltage drop, more than 80% of the originally applied gripping force can be reliably maintained due to a combination of an electric holding brake and the initial tension of the elastic element. If the gripping force and position maintenance is activated preventatively, 100% of the originally applied gripping force can be maintained. Overrun of the gripper fingers when removing the workpiece is a few millimeters and depends on the gripping force generated. Variants without gripping force maintenance are also available as an option.
• Seal
  The gripper comes strandard with enhanced protection against the ingress of dust or liquids. The IP protection of the electronics is only given if the plug connectors have been mounted properly. The gearbox of the gripper is additionally protected by a seal on the output pinions.
• Interface of the base jaws
  When using the intermediate jaw, the interface of the base jaws corresponds to that of the universal gripper PGN-plus-P. This means that the extensive range of finger accessories for the PGN-plus-P can also be used for this gripper, taking into account the interfering contours, and the application limits that apply.

You can find more information on our homepage. 

https://schunk.com/us/en/gripping-systems/centric-grippers/ezu/c/PGR_7387