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Rotary cam indexer application mode

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Update time : 2019-04-24 19:30:03
The cam cutter has two main modes of operation. One mode is called "on-demand loop." What it means is that the input shaft of the cam is cycled once, and the output shaft of the indexer outputs a position under the action of the split. The entire mechanical operation is typically accomplished by using a camshaft sensor to detect camshaft position and VFD to stop and start the motor. The camshaft dwell time provides a wide range and the camshaft stops without affecting the position of the output. In order to achieve the purpose of cycle indexing, the PLC sends a command to the VFD to accelerate the drive motor to the preset speed, the cam rotates for one week, and the output is indexed to drive the position. The sensor sends the in-position signal to the PLC, and the PLC sends a signal to the VFD on the cam. Stop the camshaft when the position is stopped. The system will be in a state of stay, no matter how long it takes, the work required for each system must be completed. The dwell time can range from a fraction of a second to a few minutes or hours, depending on the application. This combination can be accurately positioned using a drive system or other ancillary facilities.
The rotary cam indexer can also be operated in a more traditional "continuous" mode, which is also a common mode in automated production where the camshaft rotates at a constant speed and the split motion and dwell time are controlled only by the cam motion profile. Continuous mode is useful when mechanically synchronizing with camshaft timing in other equipment, or when the indexer needs to run faster than the cycle speed at which the motor is stopped and started. Continuous indexers can operate at speeds in excess of 1000 cpm. However, the limitation of this type of continuous mode is that it is impossible to process a cam that needs to quickly split the motion and then stay for a long time.
A programmable servo turntable is another common choice in automated machine use. There are two specific cases for the selection of the servo rotary table. The first is the need for flexible sports modes. An example is running two different products on a single machine, each requiring a different indexing mode. Other situations that apply to servo indexers require extremely fast positioning and then stay for a long time. In the dwell period before the start of the output motion, the camshaft needs to be accelerated to a prescribed speed to limit one cycle index. The speed at which the camshaft can accelerate has practical limitations, so there is a delay before the motion begins. When the servo motor rotates, the output will rotate once the servo motor starts operating. For example, indexing a load of 90 degrees in 0.25 seconds is not difficult for a continuous cam indexer or zero backlash servo indexer, but a cyclic on-demand cam indexer may encounter this motion. For fast servo indexing applications, a preloaded gear reducer with zero clearance is critical to achieving smooth indexing motion with a small settling time. A zero-gap transmission mechanism would be a better choice for achieving precise positioning and good dynamic response.
For any kind of drive indexer, there will be application information such as moment of inertia and indexing angle, index time and dwell time. For the manufacturer of the brand indexer, the adjustment of the processing technology and production precision, as well as the adaptability of the product's dimensional technical parameters to the rotating platform, is the true embodiment of engineering technology and processing capability.