Electricity: motive power systems – Plural diverse motor controls – Motor-reversing
Patent
1986-07-30
1987-12-15
Shoop, Jr., William M.
Electricity: motive power systems
Plural diverse motor controls
Motor-reversing
318282, 318266, 318286, 318468, G05D 312
Patent
active
047135913
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to the control of the movement of a member between first and second positions. The invention has particular application to the control of electrically operated doors and similar devices such as curtains, windows and other devices which are required to be moved between open and closed positions in response either to simple actuating commands, or to a complex set of command functions.
The invention has particular application to the control of electrically operated doors of the kind which are mounted for sliding within the cavity of a wall adjacent the door opening, such doors being employed in domestic or commercial buildings.
Objects of the invention include the provision of a self-commissioning mode of operation, automatic retraction upon the sensing of an obstacle, and a control system which facilitates the employment of a wide range of optional behaviour modes for such purposes as security, energy management, and fire response.
BACKGROUND ART
Japanese patent publication No. 55-19366 discloses an automatic door operating system in which the distance of travel of the door from its rest position is determined by counting pulses generated so as to be proportional to the number of rotations of the driving motor, and the door is controlled by comparing the pulse count with a pre-set value corresponding to the total length of travel of the door.
Such an arrangement represents a significant advance over earlier prior art systems where devices such as limit switches were employed to define the door travel, but does not provide for a self-commissioning operation, in particular requiring the total door travel to be pre-set.
DISCLOSURE OF INVENTION
In one broad form the present invention comprises means controlling the movement of a member between first and second positions by drive means coupled with said member, said control means comprising:
(a) counting pulse generating means coupled with said member to provide counting pulses only during movement of said member,
(b) counting means receiving and counting said counting pulses to provide a pulse count indicative of the position of said member relative to said first position,
(c) means generating a pulse count corresponding to a third position of said member between said first and second positions,
(d) comparator means comparing said position indicative pulse count and said third position pulse count,
(e) motion indicator means responsive to said counting pulse generating means to register a moving or stationary condition of said member,
(f) speed control means responsive to said comparator means to set the speed at which said member is driven to a first speed when said member is between said first and third positions and to a second speed when said member is moving towards said second position and is between said second and third positions, and
(g) drive stopping means responsive to said comparator means and to said motion indicator means to deactivate said drive means when movement of said member toward said second position is arrested while said member is between said second and third positions,
In a preferred form, the invention further comprises drive reversing means responsive to said comparator means and said motion indicator means to reverse said drive means when movement of said member towards said second position is arrested when said member is between said first and third positions.
Thus a characteristic of the present invention is that the total distance of travel of the door is not a factor in determining its operation, so there is no requirement during installation for accurate setting of the total distance of travel.
Furthermore, rather than determine door position by counting revolutions of the drive motor, in the present invention this is determined by counting pulses directly related to door movement. The combination of these control features enables a particularly advantageous embodiment of the invention, suited to the operation of light doors such as domestic sliding door, where a clutch device is in
REFERENCES:
patent: 3891909 (1975-06-01), Newson
patent: 3893695 (1975-07-01), Rickert
patent: 4092575 (1978-05-01), Ogishi et al.
patent: 4234833 (1980-11-01), Barrett
patent: 4236106 (1980-11-01), Davis et al.
patent: 4312033 (1982-01-01), Sweeney et al.
patent: 4471274 (1984-09-01), Ross et al.
patent: 4529920 (1985-07-01), Yoshida et al.
patent: 4565954 (1986-01-01), Yamanishi et al.
Ro Bentsu
Shoop Jr. William M.
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