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| Solenoids Used in the Cancellation of Mail |
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As the postal system continues to move toward more automation, many processes are being evaluated for improvement. One such step is cancellation of mail to prevent use of stamps or indicia on metered mail.
Solenoids are ideally used to drive the cancellation heads. Sorting machines are all electric, so pneumatics would be a costly addition to this application. However, the solenoids would have to provide consistent force for widely varying mail thicknesses. Solenoids typically produce sharply increasing forces as the air gap diminishes. This translates to more clamping force on thinner mail and less on bulky mailers. The typical range of thickness is about 0.010" to 0.250."
Chosen was the Soft Shift®â solenoid, which, unlike conventional linear units, produces output force that is virtually armature position independent. Another way to illustrate this is by comparing force vs. stroke curves of a 6EC low profile and 6EP Soft Shift at 64 watts (50% duty cycle).
The almost constant force shown by the 6EP Soft Shift will produce a consistent cancellation image over the full range of mail thicknesses.
Another benefit realized by using the Soft Shift is more consistent actuation times. Soft Shift is inherently less subject to speed variations caused by armature position. This, of course, translates to more predictable timing sequences as the mail stream varies from thick to thin and anything in between.
Soft Shift solenoids feature long life dual bearings. These oil-impregnated bearings provide rigid shaft support for proper alignment of the cancellation head. Consistent life in the millions of actuations is also absolutely vital. Combining long life features with an integral return spring and padded stops for quietness, the Soft Shift is an ideal actuator for this and similar applications.
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