Liquid pressure control system
OwnerBernard T. Rogersinventor
Life of this patent
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Abstract
A liquid pressure control system for advancing logs (19) towards a rotary cutter wheel (10) in timed relationship to successive cuts by cutters on that wheel (10). A cam arrangement (52) on the cutter wheel (10) actuates jerk pumps (71 and 72) to dispense hydraulic fluid to hydraulic rams (33 and 34) in the timber feed mechanism (18).
Claims15
A liquid pressure control system for effecting advance of a slave member in steps along a path in a timed relationship with a succesion of discrete actions by a master device, comprising at least one pump and a liquid pressure operable slave actuator device which has a movable part by which the slave member is carried;
- said pump comprising a housing;
- a pump chamber formed in the housing, a liquid displacer housed movably within the pump chamber, a liquid pressure inlet connectable to a source of liquid pressure and which is arranged within the pump housing such that liquid pressure can be drawn into the pump chamber from said source by movement of the displacer, and a liquid pressure outlet which is in communication with a space of the slave actuator device and through which liquid is displaced under pressure from within the pump chamber to said space by movement of the displacer;
- and control means responsive to said succession to control the position of said displacer, said control means being adapted to move said displacer within the chamber in synchronism with said succession to displace from the pump chamber to the space of the slave actuator device a volume of liquid sufficient to effect a step of the slave member in a timed relationship with an action of said succession, whereby the slave member is positioned at a new location on said path for the next discrete action of said succession so that a predetermined spatial relationship between the master device and the slave member is established before each action of said succession and after the previous action of said succession, and to refill the pump chamber between each such displacement.
Apparatus comprising a master device which is adapted to effect a succession of discrete actions, a slave member which is movable along a path relative to the master device, and a control system which is operable to effect advance of the slave member in steps along the path in timed relationship with said succession whereby thet slave member is positioned at a new location on said path for the next discrete action of said succession so that a predetermined spatial relationship between the master device and the slave member is established automatically after each action of said succession and before the next discrete action of said succession, the control system comprising at least one pump and a liquid pressure operable slave actuator device which has a movable part by which the slave member is carried;
- each of said at least one pump comprising a housing, a pump chamber formed in the housing, a liquid displacer housed movably within the pump chamber, a liquid pressure inlet which is for connection to a source of liquid pressure and which is arranged within the pump housing such that liquid pressure can be drawn into the pump chamber from said source by movement of the displacer, and a liquid pressure outlet which is in communication with a space of the slave actuator device and through which liquid is displaced under pressure from within the pump chamber to said space by movement of the displacer;
- and control means which are responsive to said succession, which control the position of said displacer and which are adapted to move said displacer within the chamber in synchronism with said succession so as to displace from the pump chamber to said space of the slave actuator device a volume of liquid sufficient to effect a step of the slave member in a timed relationship with each action of said succession, and to refill the pump chamber between each such displacement.
Dependencies are inferred from the claim text.