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The compression spring normally used with a platen variable mechanism is modified to include tabs so that it can also be used to torsionally bias the variable driver.
English (United States)
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Combined Torsion And Compression Spring For Platen Variable
The compression spring normally used with a platen variable mechanism is
modified to include tabs so that it can also be used to torsionally bias the variable
Spring 11 biases variable driver 13 away from pin plate 15. Pins 17 fit
through holes in the variable driver which are oversized to permit clearance
between the pins and holes. Notches 19 are added to the pin plate to receive a
tab 21 of spring 11. The spring is also anchored in the variable driver 13, and is
twisted during assembly in order to create a torsional bias of the variable driver
against the drive pins 17, thereby biasing the pins to one side of the holes in the
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