To provide a roller conveyor installation allowing a change in specification from sequential delivery to overall delivery and vice versa with easy piping work.
Cargo existence detecting means 40 each having an accumulator unit 25, a brake unit 30 and a shut-off valve 58 is provided in zones Z1-Zn, and the inlet side of the shut-off valve 58 is connected to the side of a main supply pipe 110. An solenoid selector valve 105 is provided in the Z1 on the most downstream side and valve units 60 are provided in the remaining Z2-Zn. First valve means 62, second valve means 72 and a selector valve 91 for reversibly operating both units 25, 30 are incorporated in each of the valve units 60. The first valve means 62 can supply a working fluid to the second valve means 72 with the shut-off valve 58. The second valve means 72 can supply a selector fluid to the selector valve 91 when the working fluid is supplied by the first valve means 62. A subsidiary supply pipe 120 for the selector fluid can be selectively connected to a distribution pipe 112 ranging for the main supply pipe 110 to the shut-off valve 58 in the downstream zone or a portion ranging from the solenoid selector valve 105 to the supply pipe 116.
KUMAZAWA HIROSHI
FUJITA TAKASHI
DAIFUKU KK
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