Conveyors: power-driven – Conveyor section – Live roll
Patent
1988-10-19
1990-05-22
Spar, Robert J.
Conveyors: power-driven
Conveyor section
Live roll
192 93R, 74571M, B65G 1306
Patent
active
049270052
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an actuator for mechanically switching a mechanism between at least two functional positions.
TECHNICAL PROBLEM
In conveyor plants for example are found driving devices which are switchable between a driving state and a disengaged state. This switching is done depending upon the presence or absence of conveyed objects at certain points along a conveyor. For example, the state of the driving devices can depend on the position of two different sensors which, when using conventional technology, requires double switching devices for each driving device, which is an expensive solution requiring much space.
The object of the present invention is to provide an actuator which is provided to be controlled by means of two or more sensors.
THE SOLUTION
The said purpose is achieved by means of an actuator in accordance with the present invention, characterized by the actuator comprising a rotationally symmetrical inner rotatable member which is rotatably journalled by means of an eccentrically located axle, and, around this inner rotatable member, an eccentrically journalled outer rotatable member, exhibiting actuating members which, by changing position, influence said mechanism; by the inner rotatable member and the outer rotatable member being arranged to assume different rotational positions, in part by rotation of the inner rotatable member about its axle, thereby setting the outer rotatable member in said rotational movement, and in part by rotation of the outer rotatable member relative to the inner rotatable member, thus causing the said changing of position of the said actuating members; and by the said mechanism comprising a switching device provided with an element for switching the switching device between an engaged position and a disengaged position upon switching of the actuator between a centric and an eccentric position.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described below in more detail using an exemplifying embodiment with reference to the accompanying drawings, in which
FIG. 1 shows a partially broken side view of a roller conveyor provided with actuators in accordance with the present invention;
FIG. 2 shows a view from above of a conveyor provided with actuators according to the invention;
FIG. 3 is a view on an enlarged scale of a section of the roller conveyor including an actuator;
FIGS. 4-7 show schematically a switching device contained in the roller conveyor and an associated actuator in different actuating positions;
FIG. 8 shows a partially broken sectional view of the actuator in FIG. 1; and
FIG. 9 shows schematically a side view of a modified embodiment of a roller conveyor.
BEST MODE OF CARRYING OUT THE INVENTION
The roller conveyor, shown in FIGS. 1 and 2 as an example of the use of the invention, consists of a large number of driving rollers 2-7, which are rotatably journalled in a frame 1, and which are coupled in groups by means of a driving chain 8, one driving chain for each group, which engages a chain wheel provided for each driving roller 9. Each group of driving rollers is arranged to be switched between an engaged state and a disengaged state by means of a switching device 10, 11 mounted on one driving roller 3, 6 in each group. When the periphery of the switching device is pressed against, it is arranged so as to switch between an engaged position and a disengaged position and is e.g. of a type shown in the Canadian patent No. 1181022, the periphery of which is designed as a press ring, which, at a centric position in the switching device, maintains an engaged position, but, when moved to an eccentric position, switches the switching device to a disengaged position. The switching device exhibits a member which is fixedly connected with chain wheels 12, and another member, which is fixedly connected with the associated driving roller 3, 6. The chain wheels 12 are in turn connected to a driving motor via a drive chain 14.
According to the invention, actuators 15, 16 are provided for switching the
REFERENCES:
patent: 2985474 (1961-05-01), Cook
patent: 3537568 (1970-11-01), Leach
patent: 3550300 (1970-12-01), Roder
patent: 3956965 (1976-05-01), Rusbach
patent: 4572353 (1986-02-01), Felder
patent: 4721203 (1988-01-01), Kimball et al.
Gastineau Cheryl
Spar Robert J.
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