Envelope opening machine

A machine for applying heat to the edges of envelopes having sensitizing and developing agents thereon which comprises a frame, a conveyor means, first, second and third heaters mounted on said frame in proximity to the conveyor, envelope moving means mounted on the conveyor means to move envelopes relative to said heaters, said moving means adapted to move one edge of the envelope over said first heater to apply heat thereto, means on said frame for rotating the envelope 90.degree. to rest a second edge of said envelope on said second heater, said moving means adapted to move said second edge over the second heater to apply heat thereto, means on said frame for rotating the envelopes 90.degree. to rest a third edge of said envelope on said third heater, said moving means adapted to move the third edge over said third heater to apply heat to said third edge, whereby the heat applied will deteriorate the said edges.