The present invention provides a mechanical packing conversion apparatus integrating packaging, measuring, cutting and protecting functions, comprising a box, a measuring scale and a cutting mechanism. An upper cover of the box of the apparatus and a side plate connected to the upper cover can be overturned and opened from side faces, and the cutting mechanism is disposed on a sidewall in the box; the cutting mechanism comprises a head and a base, the head being fixed to the base, a handle, a transmission member and a blade all successively connected being disposed in the head; a through hole is formed at a bottom end of the head, and the blade is placed vertically above the through hole and is communicated with the through hole; a groove configured to receive the measuring scale is provided at a bottom end of the base; and the measuring scale is fixed to the bottom inside the box.

A sheet feeding device includes a tray main body and a cover member. The tray main body has a first mount surface. The cover member is rotatably connected to an end of the tray main body on the side opposite to the sheet feeding side so that the cover member can move rotationally between a closed position where the cover member covers the first mount surface and an open position where the first mount surface is exposed, and has a second mount surface on which a sheet is mounted over the first mount surface when cover member is in the open position. The cover member includes an opening for sheet insertion which penetrates through from an upper surface to a bottom surface of the cover member so that a sheet can be inserted onto the first mount surface when the cover member is in the closed position.

A device for storing a sheet pile in a converting machine (10) comprises a transfer mechanism (28) for delivering sheets (22) into a piling area (26) of the device (22), and a sampling plate (44) which is adjustable between a sampling position and an access position, wherein the top of the piling area (26) is covered by the sampling plate (44) when the sampling plate (44) is in the sampling position and the top of the piling area (26) is free when the sampling plate (44) is in the access position.