PURPOSE: To decrease the height of a building for storing a machine by installing a cam shaft on a tilted table, pivoting the forward end part of an operating arm, the base of which is fitted to an eccentric cam of the cam shaft, on a main body chute, and interposing a resonance preventing spring between the main body chute and the tilted table.

CONSTITUTION: When a machine is operated, a cam shaft 43 is rotated through a transmission mechanism 63 by a motor 42, and an operating arm 45 is moved forward and backward by an eccentric cam 44 of the cam shaft 43. Accordingly, while resonance is prevented by a resonance preventing spring 47, a chute (a) comprising a main body chute 1 with a main body chute cover, a front chute 3 with a front chute cover 9, and a rear chute 4 with a rear chute cover 11 and oscillating arms 36, 37 are reciprocated forward and backward in the form of a parallelogram with a tilted table 34, taking the rods 40,41 as the pivot. The chute (a) is oscillated forward and backward in a body with a low frequency of oscillation. Accordingly, as the chute tilted forward is oscillated forward and backward, even if an angle of inclination of the chute is small, the height of the chute device can be decreased.