The invention relates to a motor unit used as a component in an actuating system for moving gates, in particular but not exclusively gates of the leaf type, to which reference will be made by way of example.
The actuating systems commonly marketed for a two-leaf gate generally consist of three types.
The first type (not shown) is of the “buried” type, i.e. the entire motor is situated inside a special container and buried underneath the gate. It exerts its action directly on the bottom edge of the gate.
The second type (not shown) acts on the gate by means of a hinged arm and the motor is fixed to the surrounding wall or to the support column.
With reference to
A control unit 18 is fixed to the surrounding wall and is wired to all the other devices present in the actuating system, namely the pair of motor units 17 and 19, two pairs of photocells 22, a flashing signalling lamp 23 and a wall-mounted command device 24 (basic automated system, with the smallest number of devices).
All the devices must be operated by the control unit 18 and therefore—as can be seen in FIG. 1—the system must envisage a large number of wires entering and leaving the control unit 18 itself, i.e. usually at least 8-10 pairs of wires.
More precisely in
Owing to the safety regulations, the devices envisaged are destined to increase exponentially. In fact it is common for systems to have 3 or 4 pairs of photocells, a flashing lamp, 2 or 3 command devices, 1 or 2 sensing edges as well as, obviously, 1 or 2 motors.
A smaller number of wiring cables is obtained by using a bus connection between the components of the actuating system. The devices are connected using two wires and consequently the control unit 18 may have a smaller number of outgoing wires, i.e. two wires for the motor units 17 and 19, two wires for the flashing lamp 23, two wires for the photocells 20 and two wires for an operating device 24, giving a total of 8 wires. Each device, and therefore each pair of wires, has a corresponding connection terminal in the control unit 18.
Schematically the known systems described are shown in order in
In the systems such as that shown in
Therefore, if it is attempted to incorporate the control unit 18 inside a motor unit 17, 19 in order to reduce the overall wiring of the system, considerable technical difficulties are encountered, apart from the increased costs, such as the fact that:
No less important is the external aesthetic appearance of the motor which must in any case be attractive and incorporating the control unit would have a completely negative effect.
It is also necessary to mention the difficulties of installing such a large number of outgoing cables from the motor unit, with a probable increase in the risk of errors.
It must also be emphasized that the elongated form of the motor is not determined simply by aesthetic considerations but also by structural requirements. In fact it must:
The object of the invention is to provide a motor unit, in particular, but not exclusively, for gates of the leaf type, which reduces the wiring of the actuating system and simplifies installation thereof.
This object is achieved with a motor unit used in an actuating system for moving gates, in particular gates of the leaf type, comprising:
Schematically the system according to the invention can be seen in
The motor unit Mn according to the invention advantageously uses an innovative technology which has been developed by the Applicant—forming the subject of a separate patent application—and by means of which all the peripheral devices of the system are connected in cascade only via the wire Wn. Details will be provided below.
Alternatively any interfacing system/protocol between various functional components arranged in cascade (for example in daisy chain) or via a communication bus may be used.
The advantages of the invention will emerge more clearly from the following description of a preferred embodiment, illustrated in the accompanying drawings in which:
A motor unit according to the invention is denoted by Mn. It comprises an external housing formed by an upper half-shell 54 and a bottom half-shell 56 connected to the end of a hollow cylindrical section (bar) 52. An actuating worm screw 58 (which can be rotationally operated by an electric motor, not shown) is present inside the section 52 and is engaged by a sliding piece 60 with a counter-threaded female thread which is thus able to travel along it. The sliding piece 60 is joined to a bracket 62 for fastening to the leaf of a gate. A cover 64 closes the section 52.
The upper half-shell 54 and the bottom half-shell 56 mate along one edge and are gripped together. The former is composed of a first quarter-sphere tail part 67 and a dome-shaped cover 65, and the latter is composed of a second quarter-sphere tail part 77, a parallelepiped hollow box 70 with a cavity 71 and an end piece 69. Following assembly, the two tail parts 67, 77 are positioned on top of each other and the cover 65 covers the box 70 and the end piece 69. By means of coaxial through-holes in the tail parts 67, 77, the motor unit Mn may be hinged with a support plate 82 arranged between two support brackets 84 fixed to the wall.
The cover 65 has a through-opening 80, the mouth of which coincides substantially with the internal cross-section of the box 70 so that the interior of the latter is accessible through the former. This access is exploited so as to be able to insert and house a control unit Cn inside the box 70.
This arrangement is visible more clearly in
The bottom of the box 70 is provided with three holes, one for the 220 V power supply, one for the two wires of the bus leading to the peripheral components and one for the two wires of the bus leading to the second motor.
Preferably the two conductors of the bus form an apolar bifilar line, namely one which does not impose a predetermined connection polarity on the devices connected to it. These devices, such as the motor unit, are equipped with interfacing/rectifying and filtering means such that they are unaffected by the voltage/current polarity on the bus and may therefore be connected to the bus wires without a specific correspondence of connection for the latter. The filtering means are used to obtain from the bus a stabilized power supply voltage.
It is clear that the possibility of connecting all the peripheral devices of the automated system using only two wires facilitates and speeds up the work of the installation personnel.
A preferred embodiment of the communications protocol of the bifilar line is now described (see
Each device Qn, depending on its characteristics, is designed to transmit to the control unit Cn a response signal only in a reserved time window after receiving a signal Sync introduced by the control unit Cn on the bifilar line (bus) so as to avoid possible collisions. In a window Ii only one device Qn transmits, occupying the bus. Moreover, the control unit (Cn) is adapted, by means of known means:
The time interval TB between the two signals Sync, which for the sake of simplicity may be kept constant, defines the scanning period in which the control unit Cn checks/controls/actuates the status of the components in the system.
Ti denotes an i-th instant between two signals Sync, while Ii denotes the i-th time window within which a device Qn must respond/transmit so as to be correctly identified by the control unit Cn. The positions of the instants Ti are advantageously (but not necessarily) predefined and invariable, and the duration of the windows Ii depends on the functional characteristics of the i-th device Qn, which has the possibility of responding after each synchronizing signal Sync because it has a dedicated time interval Ii.
A communications network is established such as to use therefore only one bifilar line to which the different peripheral devices (operating or command devices) may be connected.
The invention also relates to an actuating system for moving gates, in particular gates of the leaf type, comprising one or more motor units, two pairs of photocells, a flashing signalling lamp, a command device and a control unit, where the or each motor unit is designed in accordance with the characteristic features of the invention.
Number | Date | Country | Kind |
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TV2007A000014 | Feb 2007 | IT | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/IB08/50358 | 1/31/2008 | WO | 00 | 12/4/2009 |