Patent ID: 7461578

Claim:
A perforator, comprising: perforating means for perforating a sheet-shaped recording medium; chad recovery/delivery means for delivering a chad perforated by the perforating means; chad storage means for storing the chad delivered by the chad recovery/delivery means, and the chad storage means is detachably provided to an inner side of an opening and closing door on a main body of the perforator; chad guiding means for guiding the chad from the chad recovery/delivery means to the chad storage means via discharge channels; shielding means including a shielding body and a shielding face fixed on an end of the shielding body, wherein the shielding means is configured to release a shielding operation against the discharge channels to discharge the chad though an opening in an interior of the shielding body to the chad storage means when the shielding means is in a first position; and detection means for detecting whether the chad storage means is mounted on the inner side of the opening and closing door and for detecting an amount of chad stored in the chad storage means, and the detection means is positioned on a bottom edge of the chad guiding means, wherein when the shielding means is in a second position, the shielding face blocks the discharge channels to prevent the chad from being discharged to the chad storage means.