Press roll device

Advancing material of indeterminate length – By orbitally traveling material-engaging surface – Including details of roll or mount

Reexamination Certificate

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Details

C226S191000, C226S188000, C198S782000, C198S788000, C144S250140, C144S250160, C414S746700

Reexamination Certificate

active

06283353

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to the field of machinery for the wood processing industry and particularly concerns a press roll device for applying pressure on a moving piece of wood.
BACKGROUND
Pieces of wood of all kinds moving through wood processing machinery need to be carried at a controlled speed and to follow a well defined path to be properly processed. There is known in the art to provide conveying systems with a motorised pressing roll mounted on a pivoting frame. The press roll both moves the wood along its path and applies a pressure thereon to keep it on track. The pivoting movement of the frame is resiliently controlled, for example, through a pneumatic or a hydraulic jack. In these systems a lot of strain is imposed on the jack since its movement has to compensate for the unevenness of the wood surface and keep the pressure thereon constant. The jack often fails to react quickly enough to the bigger bumps on the wood's surface, temporarily loosing its grip on the piece of wood which may then deviate from the right path.
OBJECTS AND SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a press roll device that applies a more constant pressure on a piece of wood than conventional devices.
It is also an object of the present invention to provide such a device which has a better response time to unevenness in the piece of wood.
Yet another object of the invention is to provide such a device that puts less strain on the jack, thereby increasing its durability.
Accordingly, the present invention provides a press roll device for applying pressure on a piece of wood moving along a path, the device comprising:
a frame mounted in proximity to the path of the piece of wood;
a lower arm having a first end and a second end, the first end being pivotally connected to the frame;
a roller for applying pressure on the piece of wood as said piece of wood moves along the path, the roller being rotationally mounted on the second end of the lower arm;
an upper arm having a first end and a second end, the first end of the upper arm being pivotally connected to the frame, and the second end of the upper arm extending in proximity to and above the second end of the lower arm;
resilient means disposed between the second ends of the lower and upper arms; and
a jack resiliently connected to the second end of the upper arm, for applying a pressure on the piece of wood via the second end of the upper arm, the resilient means, the second end of the lower arm and the roller.
The advantages and features of the present invention will be better understood upon reading the following description of preferred embodiments thereof with reference to the appended drawings.


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patent: 5816302 (1998-10-01), Newnes

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