Conveyors: power-driven – Conveyor section – Reciprocating conveying surface
Patent
1995-06-05
1997-10-21
Terrell, William E.
Conveyors: power-driven
Conveyor section
Reciprocating conveying surface
1984593, 1984635, B65G 2500, B65G 4726, B65G 3700
Patent
active
056786816
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an operating means for moving back and forth a feed apparatus feeding elongated pieces of timber, particularly logs, into a transversal feed apparatus, said means being arranged for feeding pieces of timber piece by piece from a reception point to a discharge point, said feed apparatus having a stepped configuration, and said feed apparatus comprising a reception step member movable reciprocatingly between the initial position, in which the upper surface part of the reception step member is substantially on the level of said reception point, and the discharge position, and a discharge step member movable reciprocatingly between the discharge position, in which the upper surface part of the discharge step member is substantially on the level of said discharge point, and the reception position, and possibly one or more additional step members fitted between the reception step member and the discharge step member, and which can be moved reciprocatingly between the reception position and discharge position.
A transversal feeding apparatus is disclosed in the FI publication No. 78882. Said prior art means comprises both fixed and moving steps. In said prior art design logs are conveyed from a transversal conveyor or log table to a reception point on a lower level, from where they are fed piece by piece to a discharge point on an upper level, for which for instance a longitudinal conveyor may serve. Said transversal conveyor (or log table) and said longitudinal conveyor are substantially in one and same horizontal plane. Said means known in the art has not been designed, nor intended, for feeding logs to an essentially higher level relative to said transversal conveyor (or log table), instead, the primary function of said means is to feed logs piece by piece to the longitudinal conveyor. In the log processing sites it is quite often necessary to feed logs from a log table or equivalent to a longitudinal conveyor positioned even on a much higher level. When an apparatus such as the one disclosed in FI publication print No. 78882 is used, a chain log hoist has been provided in said instances in the adjacency thereof, thus usually increasing the investment and operation costs of the station. The feed apparatus according to said publication, operating according to the reciprocating movement principle and provided with heavy-weight elements, is relatively slow and susceptible to wear, because of which it also requires great force. The power units, such as hydraulic or pneumatic cylinders, being installed for moving the feed apparatus, are restricted as to their life time and therefore require a relatively powerful hydraulic or pressurized air pump as the operating power source.
A feed table for logs or equivalent is disclosed in the SE. patent publication No. 93756, provided with a stepped guide board, in the apertures whereof being arranged pistons to move logs onwards within the guide board pockets. The motion of the pistons is arranged by means of a complicated lever mechanism comprising a driving rod affixed on a cramp disc, to the pins whereof a T-shaped shaft has been pivoted, on the ends of the upper part whereof the piston ends being in turn pivoted. Also this means is relatively slow because the log is lifted to the next pocket each time across a step formed by the guide board. The complicated crank mechanism with the T levers is sensitive to wearing as great forces are directed at the pivots thereof.
The U.S. Pat. No. 3,524,532 in turn discloses a lifting means which is far more rapid compared with the means described in the above publications, in which the pieces are moved pushed by the ends of reciprocatingly moving lifting boards into a pocket provided by a subsequent board end. The boards have been so joined together that as a first board ascends the board adjacent thereto descends, thus opening a subsequent lifting pocket. The motion of the bodies being fed in has thereby been made more rapid. The joining of the lifting boards has been provided with a chain mechanism dr
REFERENCES:
patent: 1630438 (1927-05-01), Layland et al.
patent: 3168190 (1965-02-01), Nienstedt
patent: 3524532 (1970-08-01), Hobbs
patent: 3640378 (1972-02-01), Elliott
patent: 5086912 (1992-02-01), Howden, Jr.
Alasaari Ossi Ilmari
Klockars Anders Bengt Olof
Nissen, deceased Gustaf Anders
Rossi, deceased Pentti
Chandler Richard A.
Tahka Oy
Terrell William E.
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