PURPOSE: To feed envelopes synchronized with single tablet paper feeding by providing a belt for feeding the envelopes, an one-way clutch for driving the belt only upon said single tablet paper feeding, and a rubber plate for separating the envelopes one by one.

CONSTITUTION: When a gear 14 is rotated in a prescribed direction by power from a single tablet feeding device, a gear 12 is rotated in the same direction via a belt 13, and further a shaft 15 is rotated in the same direction via an one-way clutch 11. Accordingly, a roller 16 mounted on the shaft 15 and a belt 5 in pressure contact with said roller are rotated. With rotation of the belt 5, several sheets of a lower layer of envelopes 10 is fed out, and held between the belt 5 and a band 6 to be wound around the roller 16. A rubber plate 7 separates away uppermost envelopes 10 and one 10 just above thereof, and feeds out only a lowest envelope 10 below. It is possible to effectively feed out the single tablet paper and the envelopes 10 to a printer by combining the captioned device with the single tablet feeding device.