Positioning device for the dust-collecting bag of a dust-collecting machine

A positioning device for the dust-collecting bag of a dust-collecting machine comprising a plurality of positioning members, said positioning members positioning a dust-collecting bag in advance after said dust-collecting bag is fitted around the annular wall near the wind outlet of the wind exhausting box of a dust-collecting machine, said dust-collecting bag firmly fixed on said annular wall of said wind-exhausting box by an annular hoop after it is positioned by said positioning members:

• and characterized by,
• Said wind-exhausting box having the outer annular wall near its wind outlet formed with an annular engaging groove at a proper location:
• and
• Said positioning member shaped as an elongate plate, said positioning member formed with a straight and even combining portion, said combining portion of said positioning member axially secured on the outer annular wall of said wind-exhausting box at the inner side of said annular engaging groove, said combining portion having one end extending and bent to form an arc-shaped clamping portion protruding toward said annular wall, said clamping portion having its inner side formed with an arc-shaped projection, said arc-shaped projection of said clamping portion exactly able to be elastically and closely engaged in said annular engaging groove of said annular wall, said clamping portion having its lower end extending outward obliquely and forming a pull member, with a pull opening of a preset size formed between said pull member and said annular wall, the opening portion of said dust-collecting bag moved along said annular wall and passing through both said pull opening and said clamping portion to reach the upper edge of said clamping portion, said opening portion of said dust-collecting bag able to be clamped in position by said arc-shaped projections of said clamping portions of said positioning members and engaged in said annular engaging groove of said annular wall.