초록 ▼

A stretch film wrapping device for rotatably supporting a roll of film and dispensing the film at a selected tension includes a base member, a hub member having a device for mounting a roll of stretchable film, a shaft, a means for joining the shaft to the base and hub members to permit rotation of

A stretch film wrapping device for rotatably supporting a roll of film and dispensing the film at a selected tension includes a base member, a hub member having a device for mounting a roll of stretchable film, a shaft, a means for joining the shaft to the base and hub members to permit rotation of the hub member with respect to the base member. The means joining the shaft to the base and hub members includes a friction device for resisting rotation of the hub member with respect to the base member. The friction device includes a pair of friction surfaces mounted on the shaft. One of the friction surfaces is non-rotatably mounted to the base member and the other is non-rotatably mounted to the hub member. The friction device retards rotation of the hub member with respect to the base member. Each of the friction surfaces has an annular area extending radially outward from the shaft for frictional contact between the friction surfaces. A compressible device is mounted on the shaft for exerting through the shaft a selected force between the two friction surfaces. In this manner, a selected frictional force is maintained between the frictional surfaces for retarding rotation of the hub member with respect to the base member.

대표청구항 ▼

A stretch film wrapping device for rotatably suppoorting a roll of film and dispensing said film at a selected tension, including a base member, a hub member having a means for mounting a roll of film; a shaft; a means joining said shaft to said base member and hub member to permit rotation of said

A stretch film wrapping device for rotatably suppoorting a roll of film and dispensing said film at a selected tension, including a base member, a hub member having a means for mounting a roll of film; a shaft; a means joining said shaft to said base member and hub member to permit rotation of said hub member with respect to said base member, including a friction means to resist rotation of said hub member with respect to said base member, wherein the improvement comprises: said friction means having a pair of friction surfaces mounted on said shapft member, one of said friction surfaces is non-rotatably mounted to said base member and the other of which is non-rotably mounted on said hub member during retarted rotation of said hub member with respect to said base member each of said surfaces having an annular area extending substantially radially outward from said shaft member for frictional contact with the other of said surfaces; at least one of said friction surfaces being made of a durable material having a low coefficient of friction so as to permit a broad range of braking forces to be exerted by said friction means; compressible means mounted on said shaft member for exerting through said shaft member a selected force between said two frictional surfaces; a retaining means against which said compressible means exerts a force mounted on said shaft; and means for adjustably securing said retaining means on said shaft; whereby a selected frictional force is maintained between said pair of frictional surfaces so as to oppose rotation of said hub member with respect to said base member.