SafetyEYE® Monitors KUKA’s RoboTeam

KUKA RoboTeam in a jigless cell

A team of robots comprising two process robots and two handling robots welded the car door together in one work stage. Two jigless grippers combined to perform the geometric functions. The two gripper half shells were positioned by cooperating robots. The jigless bodyshop, therefore, is an innovative plant technology, which implements the very latest robot functionalities without the classic holding and clamping technology. The cycle time can be minimized through direct "geometric coupling". Autonomous control systems provide a high degree of flexibility. Cooperation between the team robots allows for highly flexible component positioning.

SafetyEYE® protects workers in the infeed areas
These days robots almost always work behind safety fences, screened from the application operator. New safety concepts such as SafetyEYE® help to do away with the fences and barriers that come between worker and robot. From above, SafetyEYE® simultaneously protects workers in both infeed areas independently. The operator enters the transfer area, where he is detected visually. This is safely recorded and the data is transmitted to the safety-related robot control system. The aim is to avoid a collision; this can be guaranteed by the robot's reduced traverse speed, based on the distance from the operator. As a result, the operator can insert the component directly into the robot's gripper. At the same time, the operator has free access and a clear view of the process.

 Safety and Economy in Harmony
The robot's drives are safely deactivated while the component is inserted. If the worker leaves the infeed area's danger zone, the robot will slowly start to operate. As soon as the worker has left the warning zone, production will run at full speed. A safe stop in the infeed area / running the robot down safely while the workers are still in the infeed area saves on cycle times. As well as safeguarding the infeed area, safe robots also guarantee personal safety within the jigless cell through the software. As the robots can now move about close to the safety fence, the production area can be reduced, allowing for a compact body plant.

KUKA Robotics is the North American subsidiary of KUKA Roboter GmbH, one of the world´s largest robot manufacturers. Since building its first industrial robot in 1977, KUKA has earned an international reputation for robotic excellence. Virtually all of the 80,000 robots installed in the field use our PC-based controller, making KUKA the number one PC-controlled robot manufacturer in the world. KUKA offers a complete range of advanced design robots, covering all common payload categories, from 3 kg to 1,000 kg. Within this range you can always get the exact robot you need for your particular solution. Our PC-based controllers are easily expandable and offer cutting-edge technologies such as remote diagnostics, Windows interface, icon editor, fieldbuses, SoftPLC, OPC server.

Pilz and Komet: Modern Safety and Control Concept Leads to Greater Packaging Productivity

Faster, more flexible, safer – with this objective in mind, the level of automation on plant and machinery continues to advance in all industries. Both safety and control technology take these high requirements into account. If necessary, powerful components can be combined to form complete systems, which guarantee safety on the one hand, and can increase productivity on the other. If the user can adapt technology to suit his requirements, then he has a cost-effective, tailor-made solution. In many industries, packing is still associated with manual work. Where man and machine work together, the risk of injury must be minimized to the greatest possible extent. Safety devices used to be viewed as obstructive and inconvenient, but today the
opposite is true: modern safety and control concepts make handling easier, and plant and machinery more productive.

Faster thanks to the new safety concept
The semi-automatic vacuum-packing machine feeds in the bottom foil via a roller; it is then transported via a chain drive. The foil is brought up to temperature in the forming chamber; a special compressed air/forming procedure and the appropriate tool are used to create the desired tray shape for each packaged product. Staff use both hands to insert grilled sausages into the tray-shaped plastic film, six pieces per row and per pack, before the conveyor moves on and another set emerges from the forming station. After the filling station comes the sealing station: The top film seal is fed through a second roller; a vacuum pump extracts the air and thereby the oxygen. This slows down the activity of the micro- organisms, while the inflow of nitrogen prevents the sausage slices from sticking together. Finally, the top and bottom film layers are impulse sealed under pressure in the sealing chamber. The product packaging is now secure and durable. At the machine outfeed, longitudinal and transverse cutters separate the packaged product into individual trays, which are then fed into transport crates via conveyor. Two coils wind up the residual film cut from both sides. Sprinter is the name of the latest development from Komet, manufacturer of semi and fully automatic vacuum packaging machines. The company is based in Plochingen,Germany, and has its roots in the butchers' trade. It's in this field in particular that Komet's table-top units are used, as they provide an airtight seal for everything that needs to be kept fresh and preserved. Even in the butchers' industry there appears to be an irresistible trend away from the skilled producer and towards industrial production; customers increasingly ask for ready- packed goods, so Komet is increasingly focusing on semi and fully automatic machinery. Flexible and quick to convert, they can pack items in up to eight parallel trays, depending on the packaged product and the size, with or without automatic infeed. Even non-food goods can be packaged and sealed efficiently using  automated packaging machines.
Another reason why the machine is called Sprint is because, in comparison to the previous model Quickvac 2000, it can convey products to their packaging more quickly, using a less complicated procedure. That's because of a modern safety and control concept, which Pilz developed for Komet. Designed for maximum compatibility: sensor technology, evaluation device and visualization o n the Sprinter, the multifunctional safety system PNOZmulti configures simpler, safer interaction between man and machine. The safety system has a modular structure and can be used flexibly to suit the application. Instead of wiring, the user configures the needed functions simply, in a configuration tool. This saves time, space and money because there is no longer any complex individual wiring and all the safety related functions are located in one housing. PNOZmulti is cost effective when monitoring four or more safety functions and can also undertake standard control tasks. By comparison the safety devices on its predecessor were simplistic and mainly based on individually wired switches and contactors. Large covers safeguarded wide-ranging potential danger zones such as the forming and sealing stations via switch contacts. The infeed area in between was narrow and only allowed a one-up arrangement.
On the Sprinter, the cover on the forming station is reduced to a minimum. Instead, an advance security slide ensures that it is impossible to reach into either the forming or the sealing station from the filling station. If the slide switch is not closed, the safety system will prevent the bottom film from being formed and stop pressing and heat-sealing in the sealing station. Propulsion drives and valves are switched off; the central PMI operator
terminal (Pilz Machine Interface) receives an error message, stating the cause and the source. Magnetic safety switches, PSENmag, monitor the mobile protective hood over the sealing station, the longitudinal and  transverse cutters, and the lower positions of the lift cylinder plus the security slide on the forming/sealing station. The PNOZmulti also monitors the E-STOP and the enablers that control the heaters and valves (pneumatic + hydraulic). The risk of injury from the packaging machine, therefore, is kept to a minimum, both during operation and in setup mode. "With PNOZmulti the machine has a flexible safety concept which is really easy to adapt to our requirements. Now the infeed area has a three-up arrangement, so assembly is quicker and easier, plus the machine is more productive", says Harald Janke, Technical Manager at Komet.

Solution for safety and standard
A modern control solution also fell within the scope of the cooperation between Komet and Pilz. The standard control technology on the Sprinter also comes in useful for automatic operation and setup mode. "People at Komet were unhappy with the existing control solution and were looking for an efficient alternative", recalls Ralf Kessler, Applications Engineer at Pilz. Now they are using a PMI operator terminal in conjunction with a Profibus Master. A soft PLC runs under the Windows CE operating system. The standard I/O modules are logged and controlled via the PSSuniversal. The Pilz centralized control platform covers the whole I/O periphery as one system and is universally applicable. Users have three options: pure safety applications, combined safety and standard applications or exclusively conventional/standard control  functions.
With the grey, standard head modules it is possible to use analog and digital standard inputs and outputs on the fieldbus systems, without a functional connection to the safety technology. On the Sprinter, the head module of the PSSuniversal is also connected to the PMI via Profibus-DP, just like the PNOZmulti. Due to the system's modular design, the PSSuniversal can be individually adapted specifically to meet the respective requirement. If any adaptations are required, modules can simply be expanded or exchanged.

Benefitting from expertise
Pilz was also contracted to complete the electrical design, prepare the circuit diagrams and carry out the programming, including commissioning. "As a small company with around 30 staff we are reliant on competent, reliable partners for our electrical design and programming; we need partners who know what's happening and know what's important to us", says Janke, "Here we found Pilz to be a suitable partner, their technical advice was superb and the collaboration with the Pilz staff ran smoothly." The competence of Komet in terms of automation technology, combined with Pilz's expertise in matters of control technology and safety, jointly produced a new vacuum packing machine that operates more productively and is therefore of greater value.
Pilz is a global company, as such, not all standards and information will be applicable worldwide. Please check with your local Pilz office to ensure your factory and/or machines meet local standards.

Keeping it Safe: Pilz Keeps an Eye on Robots

This year Ford kicked it up a notch at the North American International Auto Show (NAIAS). The exhibit was 48 percent larger than last year with 24 interactive displays, including; Active Park Assist Technology, the Control Blade Challenge and touch-screen digital displays. With all of the excitement in the booth, the highlight of the show was the EcoBoost Engine display. The center of attention, ABB robots “Eco” and “Boost” showed off the components of Ford’s new engine technology. EcoBoost can deliver up to 20 percent better fuel economy, 15 percent lower CO2 emissions, and improved driving performance when compared to larger displacement engines. The two robots from Cleveland Stamping Plant #1 took on lives of their own while interacting with the audience and product specialists. How was visitor safety ensured? Pilz Automation Safety L.P. provided the display with SafetyEYE™, nicknamed “eyes in the sky” to ensure nothing entered the area over the cell. The robot control ran with an ATI tool changer end effector safety monitored by PSS 3000 to pick up parts and engines to present them to the audience. The Pilz PSS3000 was connected to the I/O proximity switches which sensed the part position to provide safe handling of the parts. The Pilz PLC was utilized as the main controller for both safe and standard functions controlling and ensuring all safety device functions. PITmode and PSENslock from Pilz were integrated into the PSS3000 to provide access control to the cell doors. PITmode was utilized as a multifunction HMI for switching between manual and automatic modes, resetting errors, starting up robots and request to enter and lock/unlock the gate. The PITmode is an operating mode selector switch which provides two functions in one unit, the selection of operating mode and authorization control for machine access. The PITmode was the result of a joint effort with Ford Powertrain Engineers and Pilz Development. “In the real world of a plant SafetyEYE™ could have eliminated hard guarding, in this case the glass fencing. ABB’s Safe Motion technology in conjunction with SafetyEYE™ provides a comprehensive robot cell that eliminates the use of standard guarding. This is really a great partnership for all parties involved,” said Rick Pryce, business development manager for Pilz Automation Safety L.P.

For more information about Pilz Automation Safety L.P. or any of the products used in the display visit www.pilz.us.