Suction device and web connection device using it

摘要

The invention provides a suction device and a web coupling apparatus using the same, the suction device capable of easy suction. The suction device includes a first coupling pipe (124) that couples a negative pressure vessel (114) and a negative pressure pump (110); and a second coupling pipe (126) that couples a suction portion and the negative pressure vessel (114); a two-way valve (118) which is provided in the middle of the first coupling pipe (124); a suction three-way valve (120) which is provided in the middle of the second coupling pipe (126), an inlet being coupled with the negative pressure vessel (114), a first output being coupled with the suction portion, and a second output being open to the outside.