|
|
|
|
|
| Solenoids and the Banking Industry |
|
|
 |
STA® solenoids are used in a banking machine application. The linear solenoid is used to lock a motorized transport in various positions while other tasks were being performed. The transport mechanism is moved rapidly from one position to the next and weights several pounds. This creates the need to know when the mechanism is safe to move and when it's locked in place by the solenoid. In addition, because of the weight involved, the solenoid must be strong enough to hold the transport in place and to continually withstand the side loads.
The solenoid had to give the banking system an indication of whether it was in the energized or de-energized position. This was accomplished via optical sensors. This technology provides for non-contacting components where an infrared beam of light emitted by an LED is sensed by a corresponding photo cell. The plunger of the solenoid passes through this beam of "invisible" light at certain points in the stroke of the solenoid and thus either blocks the beam or allows it to reach the detector. The plunger of the solenoid has an extension rod with an adjustable tip which is used to set the desired trip point. In this manner, the output of the detector can be set to indicate the precise position of the plunger needed by the system to insure that the transport is safe to move or is locked in place. The output from the sensor is TTL compatible so it interfaces nicely with the controlled system.
A built-in return spring was also required. This was accomplished by locating the spring inside the unit around the extension rod which is used to activate the sensor. The spring is designed to provide a life expectancy compatible with the number of cycles the solenoid will likely experience in the application.
A feature is needed to keep the plunger aligned accurately and to support the plunger against the heavy side loads due to the weight of the transport mechanism. A special molded front bearing system held the mechanism in place with minimum movement.
Since the solenoid is mounted in tight quarters, very close to the moving transport, all wiring had to be contained within a single harness and special routing of the wires was considered. Wires for the solenoid exited the back of the solenoid and entered directly into the bottom of the sensor housing and up to the internal PC board. The wires are bundled down the side of the solenoid in a particular position so they do not interfere with the moving transport mechanism.
The STA® became a solution the transport manufacturer could...bank on it.
|
|
|
File Format Help
|
|
|
ZIP: Some files need to be unzipped. Unzip utilities available for download for Windows / Macintosh.
For technical difficulties with this page contact us here.
|
|
L238
|
|
|
|
|
