WEB-ROLL ANTI-CLOCKSPRINGING MECHANISM

摘要

An anti-clockspringing mechanism for a web-roll (14) in a cartridge (10) compris es a unitary lock member (52 or 78) having a cylindrical body (54 or 80) rotatably mounted in a sidewall (22, 24) of the ca rtridge (10). A flange (34 or 94) on a web-spool (35) on which the web-roll (14) is wound is provided with an annular lip (66 or 92) having alternately spaced lugs (68 or 98) and notches (70 or 96). The lock member body (54 or 80) has a handle (58 or 84) on o ne side thereof extending toward the cartridge exterior and at least one shoulder (62 or 90) projecting from the opposite side thereof into the cartridge interior. The shoulder (62 or 90) lies in the plane of the annular lip (66 or 92) in alignment with a secto r thereof. The lock member (52 or 78) is rotatable between an unlocked position (Fig. 4 or Fig. 7), in which the shoulder (62 or 90 ) is withdrawn from a lip notch (70 or 96) and is out of alignment with the lip lugs (68 or 98) for allowing the web-spool (35) to freely rotate, and a locked position (Fig. 5 or Fig. 9) in which the shoulder (62 or 90) nests within a lip notch (70 or 96) in a pos ition transverse to the lip lugs (68 or 98) for preventing the web-spool (35) from rotating.