Tape feed control apparatus for a correction tape cassette for a typewriter

A method for controlling the amount of correction tape being fed from a correction tape cassette to a printing point for lifting-off or covering-up a typed character, said method comprising

• providing a correction tape cassette having:
• a housing including a side wall,
• a post mounted in the housing,
• a brake finger pivotally mounted on the post so that an end portion of the brake finger may make frictional contact with a correction tape on a take-up spool for holding the tape firmly on the take-up spool,
• spring means in contact with the brake finger for urging the brake finger end portion against the tape on the take-up spool,
• an opening in the side wall of the housing for admitting a typewriter metering post into the housing,
• a stop member formed in the housing for limiting the travel of a typewriter metering post into the housing,
• said stop member being stationary and fixed in position in the housing so that its position does not change in response to the amount of correction tape on the take-up spool so that the distance travelled by the metering post corresponds to a constant amount of rotation of the take-up spool no matter whether cover-up correction tape of lift-off correction tape is on the spool, and so that as more and more correction tape is advanced for the same amount of rotation of the take-up spool so that the spacing between successive characters on the correction tape increases,
• tilting the correction tape cassette upwardly so that the correction tape is placed at the printing point over the typed character to be corrected,
• lowering the correction tape cassette to its original position after the correction has been made,
• moving the typewriter metering post through the opening in the side wall of the housing into the housing until it contacts the stop member,
• rotating the take-up spool an amount corresponding to the distance travelled by the metering post to the stop member,
• rotating the take-up spool each time a correction is made by the same contact amount no matter how much correction tape is on the take-up spool,
• and increasing the spacing between successive characters on the correction tape each time a correction is made.

Tape feed control apparatus for a correction tape cassette for a typewriter for controlling the amount of correction tape being fed to a printing point for lifting-off or covering-up a typed character, comprising

• a housing having a side wall,
• a post mounted in the housing,
• means for holding the tape firmly on the take-up spool and for preventing the spool from rotating backwards,
• an opening in the side wall of housing for admitting a typewriter metering post into the housing,
• stop means formed in the housing for limiting the travel of the typewriter metering post into housing,
• said stop means being stationary and fixed in position in the housing so that its position does not change in response to the amount of correction tape on the take-up spool so that the distance travelled by the metering post corresponds to a constant amount of rotation of the take-up spool no matter whether cover-up correction tape or lift-off correction tape is on the spool, and so that as more and more correction tape winds around the take-up spool, more correction tape is advanced for the same amount of rotation of the take-up spool so that the spacing between characters on the correction tape increases during the life of correction tape cassette.