Abstract: As a rotary member 21 provided on the back surface side of a guide 5 is rotated, its blades get out to the front surface side through a window 8 formed in the guide 5. With this rotation, the height level of the blades getting out from the window 8 is changed. With the rotation of the rotary member 21, postal matter being led reaches a side plate 3. A bottom plate 2 is slanted such that its side, on which the guide 5 is provided, is higher in level than the opposite side 53. Owing to this slant, a support plate 4 receives gravitational force of the postal matter stack. A wire 16 is held stretched between a holder slide 7 and a wire mounting member 17. Springs 14 and 15 are elongated with movement of the support plate 4 caused by the gravitational force of the stack. The springs 14 and 15 provide increasing forces tending to restore their initial length with their elongation.

Abstract: As a rotary member 21 provided on the back surface side of a guide 5 is rotated, its blades get out to the front surface side through a window 8 formed in the guide 5. With this rotation, the height level of the blades getting out from the window 8 is changed. With the rotation of the rotary member 21, postal matter being led reaches a side plate 3. A bottom plate 2 is slanted such that its side, on which the guide 5 is provided, is higher in level than the opposite side 53. Owing to this slant, a support plate 4 receives gravitational force of the postal matter stack. A wire 16 is held stretched between a holder slide 7 and a wire mounting member 17. Springs 14 and 15 are elongated with movement of the support plate 4 caused by the gravitational force of the stack. The springs 14 and 15 provide increasing forces tending to restore their initial length with their elongation.