送おくり穴あな

noun

perforations; sprocket holes

Technical term for the holes along the edge of film or paper tape used for transport or synchronization. Common in photography, film projection, and early computing contexts.

• フィルムの送おくり穴あなが破やぶれていると、映えい写しゃ機きで正せい常じょうに再さい生せいできない。

  If the film's perforations are torn, it cannot be played back properly on a projector.