One-time-use camera with cartridge retainer to ensure film-on-sprocket retention during camera assembly

Abstract

A partially assembled one-time-use camera includes a film section that longitudinally extends from a rotatable film winding spool in a film cartridge and that is engaged with a rotatable metering sprocket, and a separate rear cover part that is to be placed over the film section and the film cartridge and is constructed to prevent the film section from retracting out of engagement with the metering sprocket. The film winding spool is rotatable in a film winding direction to wind the film section into the film cartridge. If the film cartridge is allowed to rotate in the film winding direction before the rear cover is placed over the film section and the film cartridge, the film section will retract out of engagement with the metering sprocket. Consequently, a cartridge retention piece is positioned against the film cartridge to prevent the film cartridge from being rotated in the film winding direction. This prevents the film section from retracting out of engagement with the metering sprocket when the rear cover part is not placed over the film section and the film cartridge.