Conveyors: power-driven – Conveyor for changing attitude of item relative to conveyed... – By conveyor and means driven for turning successive conveyed...
Reexamination Certificate
1998-08-25
2001-04-17
Hess, Douglas (Department: 3652)
Conveyors: power-driven
Conveyor for changing attitude of item relative to conveyed...
By conveyor and means driven for turning successive conveyed...
C198S407000, C198S415000
Reexamination Certificate
active
06216846
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method of turning boards which are transported with their longitudinal direction transverse to the direction of movement of a conveyor with uniformly spaced conveyor dogs, the boards being at least partly driven by the front sides of the dogs in abutment against the rear edges of the boards.
The present invention also relates to an apparatus for turning boards and comprises a first conveyor with uniformly spaced conveyor dogs for transport of the boards with their longitudinal direction transverse to the direction of movement of the conveyor.
BACKGROUND ART
In the refining of timber in the form of boards in sawmills, planing mills, furniture factories or the like, it is often necessary that the boards be turned upside down between different working operations or in order to carry out quality inspection. Situations also arise when only certain boards in a batch are to be turned over. Such turning of boards has hitherto largely been carried out manually.
PROBLEM STRUCTURE
The present invention has for its object to devise the method disclosed by way of introduction such that it permits a fully automatic turning of the boards upside down. The present invention also has for its object to devise the method such that only certain boards included in a batch are turned over. The present invention further has for its object to devise the method such that the boards may be handled at great speed and with a high degree of reliability without being damaged.
The present invention also has for its object to design the apparatus intimated by way of introduction such that it is capable of turning all or only certain boards included in a batch at great speed and with a high degree of reliability, that the apparatus is simple and operationally reliable and is also economical in manufacture and in operation.
SOLUTION
The objects forming the basis of the present invention in respect of the method will be attained if the method is characterized in that the boards are moved forwards in a direction of movement in relation to the conveyor such that the front edges of the boards are brought to the region of the rear side of the next dog in the conveyor, that lifting devices which are moved synchronously with the conveyor are brought into engagement with the undersides of those boards which are to be turned in the region at their front edges, that the lifting devices are gradually raised, and that the boards are subjected to a force in relation to the lifting devices forwardly in their direction of movement, whereby the boards are caused to turn over with their front edge facing upwards/rearwards.
The objects forming the basis of the present invention in respect of the apparatus will be attained if this is characterized by at least one second conveyor which is substantially parallel with the first and has an upper part at a slightly greater height than the upper part of the first conveyor, the second conveyor operating at greater speed of movement that the first, and a number of lifting devices which are disposed to move synchronously with the first conveyor and to be liftable in the region behind the dogs of the first conveyor.
Further advantages will be attained according to the present invention if the method is also given one or more of the characterizing features in and if the apparatus is given one or more of the characterizing features.
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patent: 4119216 (1978-10-01), Pryor et al.
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patent: 5143197 (1992-09-01), Sauer
patent: 5363950 (1994-11-01), Lacuna et al.
patent: 5518103 (1996-05-01), Achelpohl et al.
patent: 3150375 A1 (1982-11-01), None
patent: 3546087 A1 (1987-06-01), None
patent: 421 505 (1982-01-01), None
C Gunnarssons Verkstads AB
Hess Douglas
Smith , Gambrell & Russell, LLP
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