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RACK-TYPE ESCAPEMENT MECHANISM OF A TYPEWRITER CARRIAGE

When plate 1 oscillates about fixed axis A-A in a plane perpendicular to that of the drawing, ratchet-tooth rack 2 is shifted by spring 5 to the right in fixed guides d-d as soon as tooth a, rigidly attached to plate 1, swings out of engagement with a tooth of rack 2. In its motion to the right, rack 2 shifts angle plate 3 whose tooth b remains in engagement with a tooth of rack 2 as plate 1 swing…