CA1293312C - Variable drive mechanism for the panel of a gate or similar structure - Google Patents
Variable drive mechanism for the panel of a gate or similar structureInfo
- Publication number
- CA1293312C CA1293312C CA 558792 CA558792A CA1293312C CA 1293312 C CA1293312 C CA 1293312C CA 558792 CA558792 CA 558792 CA 558792 A CA558792 A CA 558792A CA 1293312 C CA1293312 C CA 1293312C
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- Canada
- Prior art keywords
- point
- gate
- panel
- limiting
- detector
- Prior art date
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- Expired - Lifetime
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Abstract
Abstract Variable electrically motorized drive mechanism for gates or similar structure close-off devices that can be installed for the purpose of an assembly operation that is as heavy-duty as possible and without fine adjustments, for which purpose the gate is provided with controls that essentially comprise a position detector, a memory, and a reference-point indicator, the last of which is positioned between the gate-panel limiting positions and outside of any stop positions or defines a corresponding gate-panel reference-point position and synchronizes the position detector at each stroke such that the path that the panel is to travel along from the reference-point position into a particular desired position is dictated or monitored in accordance with a memory output that corresponds to the adjusted position.
The system is accordingly continuously self monitoring and can synchronize itself when the motor is started up again after a power outage and possibly manual operation of the gate.
The system is accordingly continuously self monitoring and can synchronize itself when the motor is started up again after a power outage and possibly manual operation of the gate.
Description
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1 1 V~RIABLE DRIVE MECHANISM FOR THE PANEL OF A GATE
1 1 V~RIABLE DRIVE MECHANISM FOR THE PANEL OF A GATE
Gates of the type concerned in the present context are in 4 ~l particular overhead gates, although they may also be verti-5 l~ cal roll-up gates, sliding gates, etc., have a motorized Ç ll mechanism that drives a panel or similar structure back and 7 I forth along a particular path between two limiting posi-8 ~I tions, and operate with limit switches that stop, by means 9 li of a radio signal for example, the motor that is responsible 10 l¦ for the motion of the panel as soon as the panel arrives in ~ its prescribed limiting position.
13 1 The limit switches are mounted in the vicinity of the 14 , limiting positions actually assumed by the gate panel, with a switched component on the frame or track of the gate and a 16 ¦ switching component on the panel. Switched components 17 , accordingly mounted near the bottom of the opening to be 18 j closed off by the gate and at the edge of the gateway are, 19 however, subject to damage, especially in heavy-industrial applications. Since they are also more exposed to con~amina-21 ¦ tion and splashing, both mechanical limit switches and those 22 1 activated for example by light barriers entail associated problems.
24 l 25 ;~It is of particular significance that positioning the limit 26 j. switches in the vicinity of the rame or track and activat-27 ing them by means of the panel itself not only ~entails 28 additional installation labor after the gate has been 29 mounted but also and in particular demands alignment and 30 1l adjus~ment that require a lot of time and effort on site and 33~2 1 are not within the capabilities of the average installer, 2 who is more accustomed to less skilled labor. The small 3 volume of space ordinarily available also makes for prob 4 lems.
6 Simulating the motion of the gate panel, exploiting, that 7 is, a parameter that corresponds to that motion and is 8 derived from its drive mechanism although greatly reduced in 9 scale to rotate or displace a certain component to an extent that represents the actual measured path traveled by the 11! panel, has been proposed. A simulating component of this 12 type thus also travels between two limiting positions that 13 correspond to those of the panel, at which points they 14l activate switchgear that accordingly reproduce the limiting 15¦ positions of the panel.
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17l Although a simulator, which is preferably positioned in the 18ll vicinity of the drive mechanism or its controls, is protect-l9i ed from contamination, dirt, and moisture, it demands especially precise adjustment in relation to the panel once 21l the gate has been installed to the extent for instance that 22! the point at which the panel begins to move corresponds 23 precisely with the point at which the displacement of the 241 simulator commences. At the path-reduction ratios involved, even sIight discrepancies will allow the panel to travel 26jl beyond its limiting position a~d collide against the end of 27'¦ lts track or against other objects. What is called a zero 28, match between the panel and the moving simulator component 29 accordingly demands special care and sensi~ivity that is 3~
33~'~
1 difficult to obtain in such a coarse operation as mounting a 2 gate.
4 The object of the present invention is to create a drive mechanism for a gate with motor controls depending on the 6 motion of the panel that is especially easy to install, 7 reliable, and simple to adjust, even when the newly in-8 stalled gate i~ operated for the first time~
This object is attained in accordance with the invention by 11 means of the characteristics recited in Claim 1.
1~
13 The point of departure for the invention is the synchroniza-14i tion of a position dekector that indicates the instantaneous 15l position of the gate panel with the actual motion of the 16 , gate at least once along the path between its two limiting 17,1 positions, thus allowing the position detector to be in 18 ~ error to a certain extent. A reference-point indicator is 19,, for this purpose activated while the panel is traveling 20 1l through a specific but extensively freely selectable 21l reference-point position between the two limiting positions 22¦ or through one or more stop positions located between them, 231 upon which the reference-point indicator releases a synchro-24¦ nization signal to the position detector, calibrating it at a particular value that can depend on the direction that the 26 il panel is traveling through the reference-point position in.
27'l A specific value that depends on the particular limiting 28 position and stop position o~ the panel is then entered in a 29 memory and dictates the value of the position detector at which the motor is stopped.
~3312 l j The position detector in one particularly preferred embodi-2 1¦ ment of the invention is a simple incremental counter that 3 counts a simple sequence of pulses emitted as the panel moves, with the instantaneous count preferably released in the form of parallel information, especially a dual-coded 6 signal, at an appropriate multipole output terminal. The 7 memory is also preferably a digital circuit that just as 8 simply matches the incremental counter in the position 9 detector. Furthermore, the reference-point indicator is 10ll accordingly a digital component, a YES-NO switch or thresh-11 1 old switch in the simplest case or preferably one that 12 ¦ operates on the principle of dual-coded parallel signal 13 1 expressions when the signal processing is more complicated.
14 l 15; The three switching devices, specifically the reference-16' point indicator, the position detector, and the memory, can 17l operate in conjunction in various ways as will now be 18l described.
19 ' 20l~ The position detector can be reset to a specific value, zero 21 l for example, by the reference-point indicator every time the 22 l panel travels through the reference-point position. As the 23 , panel continues to travel to the next prescribed stop 24~ position or limiting position in the same direction~ the 25l' position detector will then be reset in accordance with the 26 1l motion of the panel, and its count will in particular be 27 forwarded on, until it releases a value that represents the 28 subsequent prescribed stop position or limiting position to 29 l the memory. When the output of the position detector co-incides with that of the memory, a current-supply control , I
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1 that switches off the motor will be activated. The reference-2 point indicator in this embodiment is especially simple 3 because one and the same setting value is always released to 4 ~ the position detector. ~ comparator will on the other hand 5;j be needed in order to detec~ the coincidence between the 6l output from the position detector and the memory value that 7 1l represents the particular desired position~
8', 9 When in another embodiment the gate panel travels through 10 i the reference-point position of the position detector, the 11 l reference-point indicator will enter in the memory a signal 12 that represents the next prescribed stop position or limit-13 ~ ing position along the direction of travel. With this stored 14 value transferred to the position detector as a point of departure, the detector will continue to b~ supplied until 16 it arrives at an "overflow" value, zero or the next decade 17 etc. for example, upon which a signal obtained from the 18 overflow will be exploited to activate the motor's current-19 supply controls.
20 l 21 In both cases the controls can be adjusted in the same way 22 when the system is operated for the fixst time. The ~ate is 23 installed finished on site, that is, and the reference-point 24 position established somewhere between the two limiting positions and preferably outside of the stop position ox 26 positions if any. In the latter case the reference-point 27 position is preferably established between the gate-closed 28 ' position and the immediately adjacent stop position because 29 it is to be expected that the panel will generally be moved back and forth between the two positions when the stop ~3~
1 I position is initiated and that it will be the exception for 2¦ the panel to be lowered out of the gate-open limiting 31 position into the stop position. The reference-point posi-4 tion will generally be established such that the panel will to the greatest extent possible travel through it during 6 I every phase of motion.
13 1 The limit switches are mounted in the vicinity of the 14 , limiting positions actually assumed by the gate panel, with a switched component on the frame or track of the gate and a 16 ¦ switching component on the panel. Switched components 17 , accordingly mounted near the bottom of the opening to be 18 j closed off by the gate and at the edge of the gateway are, 19 however, subject to damage, especially in heavy-industrial applications. Since they are also more exposed to con~amina-21 ¦ tion and splashing, both mechanical limit switches and those 22 1 activated for example by light barriers entail associated problems.
24 l 25 ;~It is of particular significance that positioning the limit 26 j. switches in the vicinity of the rame or track and activat-27 ing them by means of the panel itself not only ~entails 28 additional installation labor after the gate has been 29 mounted but also and in particular demands alignment and 30 1l adjus~ment that require a lot of time and effort on site and 33~2 1 are not within the capabilities of the average installer, 2 who is more accustomed to less skilled labor. The small 3 volume of space ordinarily available also makes for prob 4 lems.
6 Simulating the motion of the gate panel, exploiting, that 7 is, a parameter that corresponds to that motion and is 8 derived from its drive mechanism although greatly reduced in 9 scale to rotate or displace a certain component to an extent that represents the actual measured path traveled by the 11! panel, has been proposed. A simulating component of this 12 type thus also travels between two limiting positions that 13 correspond to those of the panel, at which points they 14l activate switchgear that accordingly reproduce the limiting 15¦ positions of the panel.
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17l Although a simulator, which is preferably positioned in the 18ll vicinity of the drive mechanism or its controls, is protect-l9i ed from contamination, dirt, and moisture, it demands especially precise adjustment in relation to the panel once 21l the gate has been installed to the extent for instance that 22! the point at which the panel begins to move corresponds 23 precisely with the point at which the displacement of the 241 simulator commences. At the path-reduction ratios involved, even sIight discrepancies will allow the panel to travel 26jl beyond its limiting position a~d collide against the end of 27'¦ lts track or against other objects. What is called a zero 28, match between the panel and the moving simulator component 29 accordingly demands special care and sensi~ivity that is 3~
33~'~
1 difficult to obtain in such a coarse operation as mounting a 2 gate.
4 The object of the present invention is to create a drive mechanism for a gate with motor controls depending on the 6 motion of the panel that is especially easy to install, 7 reliable, and simple to adjust, even when the newly in-8 stalled gate i~ operated for the first time~
This object is attained in accordance with the invention by 11 means of the characteristics recited in Claim 1.
1~
13 The point of departure for the invention is the synchroniza-14i tion of a position dekector that indicates the instantaneous 15l position of the gate panel with the actual motion of the 16 , gate at least once along the path between its two limiting 17,1 positions, thus allowing the position detector to be in 18 ~ error to a certain extent. A reference-point indicator is 19,, for this purpose activated while the panel is traveling 20 1l through a specific but extensively freely selectable 21l reference-point position between the two limiting positions 22¦ or through one or more stop positions located between them, 231 upon which the reference-point indicator releases a synchro-24¦ nization signal to the position detector, calibrating it at a particular value that can depend on the direction that the 26 il panel is traveling through the reference-point position in.
27'l A specific value that depends on the particular limiting 28 position and stop position o~ the panel is then entered in a 29 memory and dictates the value of the position detector at which the motor is stopped.
~3312 l j The position detector in one particularly preferred embodi-2 1¦ ment of the invention is a simple incremental counter that 3 counts a simple sequence of pulses emitted as the panel moves, with the instantaneous count preferably released in the form of parallel information, especially a dual-coded 6 signal, at an appropriate multipole output terminal. The 7 memory is also preferably a digital circuit that just as 8 simply matches the incremental counter in the position 9 detector. Furthermore, the reference-point indicator is 10ll accordingly a digital component, a YES-NO switch or thresh-11 1 old switch in the simplest case or preferably one that 12 ¦ operates on the principle of dual-coded parallel signal 13 1 expressions when the signal processing is more complicated.
14 l 15; The three switching devices, specifically the reference-16' point indicator, the position detector, and the memory, can 17l operate in conjunction in various ways as will now be 18l described.
19 ' 20l~ The position detector can be reset to a specific value, zero 21 l for example, by the reference-point indicator every time the 22 l panel travels through the reference-point position. As the 23 , panel continues to travel to the next prescribed stop 24~ position or limiting position in the same direction~ the 25l' position detector will then be reset in accordance with the 26 1l motion of the panel, and its count will in particular be 27 forwarded on, until it releases a value that represents the 28 subsequent prescribed stop position or limiting position to 29 l the memory. When the output of the position detector co-incides with that of the memory, a current-supply control , I
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1 that switches off the motor will be activated. The reference-2 point indicator in this embodiment is especially simple 3 because one and the same setting value is always released to 4 ~ the position detector. ~ comparator will on the other hand 5;j be needed in order to detec~ the coincidence between the 6l output from the position detector and the memory value that 7 1l represents the particular desired position~
8', 9 When in another embodiment the gate panel travels through 10 i the reference-point position of the position detector, the 11 l reference-point indicator will enter in the memory a signal 12 that represents the next prescribed stop position or limit-13 ~ ing position along the direction of travel. With this stored 14 value transferred to the position detector as a point of departure, the detector will continue to b~ supplied until 16 it arrives at an "overflow" value, zero or the next decade 17 etc. for example, upon which a signal obtained from the 18 overflow will be exploited to activate the motor's current-19 supply controls.
20 l 21 In both cases the controls can be adjusted in the same way 22 when the system is operated for the fixst time. The ~ate is 23 installed finished on site, that is, and the reference-point 24 position established somewhere between the two limiting positions and preferably outside of the stop position ox 26 positions if any. In the latter case the reference-point 27 position is preferably established between the gate-closed 28 ' position and the immediately adjacent stop position because 29 it is to be expected that the panel will generally be moved back and forth between the two positions when the stop ~3~
1 I position is initiated and that it will be the exception for 2¦ the panel to be lowered out of the gate-open limiting 31 position into the stop position. The reference-point posi-4 tion will generally be established such that the panel will to the greatest extent possible travel through it during 6 I every phase of motion.
7 l 8l When it is impossible to predict what phase of motion the 9 panel will be traveling through most often and/or when extreme precision is necessary, there can be two or more 11 reference-point positions with as many reference~point 12 indicators, the latter just in front of the stop position or 13 limiting position that must be activated with particular 14 precision.
16 Before the normal operating controls are activated for the 17 first time by a third party the gate panel will be randomly 18 positioned and the position detector, memoxy, and, in the 19 case of a bistable sys~em, the reference-point indicator as well will be in a state of indefinite readout. The actual 21 state of the panel that is to be operated for the first time 22 must accordin~ly be matched with that of the controls. The 23 reference-point position is accordingly established between 24l the limiting positions and outside of any stop positions as previously described herein. As will be described in detail 26 later herein, this can be done by an appropriately locally 27 determined positioning of the reference-point indicator on 28 the frame or track of the gate etc. or within the scope of a 29 panel-motion simulator. The panel is then moved manually with the assistance of a pressure sensor ~dead man's . .
i ~ 33~;~
1 operation) toward and beyond the reference-point position.
2 The reference-point indicator, at least if it is monostable, 3 simultaneously emits a synchronization signal to the posi-4 tion detector that sets it at a specific value, especially zero. As the gate continues to travel toward the next stop 6 position or limiting position, the position detector is 7 tripped and retained in the next desired position. The value 8 then indicated at the output terminal of the position 9 detector is entered by means of an input key into an address in the memory that is associated with the stop position or 11 limiting position, and the value is retained constantly at 12 that address. The panel is then shifted into the next stop 13 position or limiting position and retained there, upon which 14~l the value of the position detector that corresponds to this 15 l¦ position is transferred by means of another input switch to 16 1 another address in the memory that is associated with the 17 I position. For the purpose o~ storing the stop position or 18 1 limiting position on the other side of the reference-point 19 ! position the gate panel is now shifted in the opposite 20 ¦¦ direction beyond reference-point position, so that the 211 position detector is reset to the prescribed value, prefera-22¦ bly zero. As the panel continues to move, ~he next adjacent 23l stop position or limiting position is activated and the ~4 l¦ resulting indicating value on the part of the position 25~,1 detector entered by means of an input key at an address 26 provided for that position in the memory.
28 In an initial and preferred embodiment of the invention the 29 position detector is compulsorily reset by the ~ynchroniza-3G tion signal or by each synchronization signal to the ~33~
li prescribed value, especially zero, and varies its value in 2 accordance with the distance traveled by the panel to the 3 next stop position or limiting position. Constant comparison 4 of the output of the position detector with the values stored in the memory results, once a prescribed stop posi-6 tion or the limiting position beyond the reference-point 7 position has been attained, in coincidence betwèen the 8 output signals from the position detector and those from the 9l associated memory address, activating current-supply con-10,l trols that stop the motor. If the panel is shifted out of 11 l this position in the opposite direction, the output Qf the 12 , position detector can be continuously set back so that, in 13 I the case of a stop position located upstream of the 14 reference-point position in this direction, the output of the position detector will coincide with that of the associ-16 ated memory address. When this stop position is activated, 17l the motor can be turned off again by appropriate activation 18 1l of the current-supply controls. The position detector can 19 l¦ similarly be disengaged in accordance with the motion of the 20,' panel beyond the reference-point position by compulsorily 21 i resetting the detector to the prescribed value, preferably 22 1l zero, as the panel travels through the reference-point 23l position. A negative value is of course also possible.
24ll For a directionally dependent back-and-forth disengagement 26 , of the position detector of this type it is necessary to be 27 able to detect the particular direction that the panel is 28 traveling in. A pulse generator accordingly allows signals 29 ~ to be detected in accordance with the path or with the 30 I direction of rotation of the motor. Preferred ror this ,~
l~ - 8 -., ~3~
1 purpose is a generator disk that is driven by the motor, 2 especially its output shaft, and has two scanning tracks and 3 at least two signal-generating structures that enclose 4 different angles.
5,l 6l, It is on the other hand also possible to disengage the 7 i position detector by summing up from a passage through the 8 j reference-~oint position independent of the direction of 9 travel. If there is in this case a stop position hetween the lOi reference-point position in the particular operating range, 11 another memory output must be made available to provide for 12 comparison the value summed up during the motion back to the 13 reference-point position at the stop position because the 14 panel that is shifted out beyond the stop position will sum up, when the direction is reversed, the distance between the ~6 stop position and the limiting position with reference to 17 the information from the position detector.
19 Another possibility is to completely change the disengage-ment of the position detector as the panel travels through 21 the reference-point position once the values for the limit-2~ I ing po~ition or stop position have been entPred to the 23 extent that the value obtained from the memory address 24 associated with the prescribed stop position or limitiny position is entered in the position detector every time the 26 panel travels throu~h the reference-point position. The 27 , counter can then count back from this value to the pre-28 ` scribed value, pre~erably zero, as the gate panel travels ~9 into the desired position, generating a signal that !
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1ll activates the current-supply controls once the value or the 2~ zero is attained.
3,l 4~l It must be ensured that restarting the gate-drive mechanism 5,l subsequent to a power failure, even a very brief outage, 6I will not damage it. This can basically be done by designing 7l the overall controls such that they will not lose theix 8' signal content when the power is interrupted. This approach 9l is admittedly comparatively expensive, especially in rela-10l tion to the position detector. It is also necessary to 11l ensure that the panel is not shifted manually, by means of a12, hand chain for example, duriny a power outage into another 13l position that does not correspond to the one indicated by 14l the position detector. The memory in one especially pre-15¦ ferred embodiment is accordingly a "non-volatile" switching 16 mechanism, so that its contents will not change or get lost 17 during the outage. The position detector on the other hand 18 must be a "volatile" switching mechanism, so that the 19 particular positional value will be erased when the power fails. The reference-point indicator, finally, will have a 21 bistable switch component that will even during a pow~r 22 outage indicate which direction of the two the panel is 23 traveling in from the reference-point position. This infor-24 i mation from the bistable switch is utilized to ensure, once 25 , the system has been turned on again, that the panel can only 26 travel toward the reference-point position and ~hat, once it 27 has traveled beyond the reference point, it will reset the 28 position detector as previously described herein. This 29 measure will re-establish the synchronization between the 3o !
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~33~2 1 position of the panel and the output value of the position 2 detector subse~uent to a power failure.
4 When the power failure lasts longer and the panel has to be shifted by hand as is regularly provided for in practice, it is preferable to employ a bistable indicator-switch that 7 will appropriately vary its state as the panel is shifted 8 through the reference point position by hand. This switch 9 can be switched by muscle power and is preferably a magneti-cally activated bistable switch of the type described in 11 greater detail later herein with reference to the drawing.
13 Depending on the design of this bistable switch for the 14 ~ reference-point indicator it is possible for no pulse to be lS emitted when the panel travels beyond the reference-point 16 position in the direction in which the bistable switch has 17, ii already been tripped. In this case the position of the panel 18, is synchronized with the value emitted by the position 19, detector and the limiting position or stop position if any 20l is entered in such a wby that the finally installed gate 21 panel is initially shifted with a manually operated scanning 22¦ swltch ~dead-man operation) in one direction and then in the 23l' othPr direction beyond the reference~poin~ position. This 24 measure will ensure that, at least when the panel travels 25~ past the reference-point position for the second time, the 26 position detector will be reset to the prescribed value, 27 especially zer3, ensuring the aforesaid adjustment in 28 accordance with first-time operation.
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1 The reference-point indicator can be positioned where it 2 will be directly activated by the panel, having for example 3 a switched component that is mounted station~ry on the Erame 4 of the gate, on the panel track, or in a similar location and activated by a switching component entrained along with 6 the panel. It will accordingly be generally possible without 7 any problem to mount the switching component and the 8 switched component on the frame or track and on the panel at 9 the factory before the gate is installed, eliminating the necessity for such labor while the gate is being installed.
11 It is also possible, especially if the switch is magnetical-12 ly activated, to provide a tolerance field, eliminating the 13 ll need for any adjustments once the gate has been installed.
~ It is also possible to realize the reference-point indicator 16 '~ within the scope of a very down-scaled panel-motion simula-17 tor. The switched component will again be stationary in this 18 , version and the switching component mounted on a part that 19 ll imitates the motion of the panel at a greatly reduced scale, 20 ll the nut for instance of a spindle connected to the output 21 1I terminal of a transmission positioned downstream of the 22 1, motor. The actual position of the panel can be synchronized 23 '' with that of the spindle nut that dictates the reference-24 ll point position once the gate has been installed by simply 25 il attaching the spindle nut, which can for this purpose be 26 ~plit in two axially, at an appropriate point where it 27 travels along the spindle. The panel is then ~or example 28 shifted, once it has been installed, into the gate-closed 29 position with ssanning switches (dead man's switches) and the nut secured to the spindle in such a way that, once the 11 panel has been shifted out of the gate-closed position by 2¦ means of the motorized drive mechanism, the spindle nut and 3l the switching component will travel past the stationary , switched component, dictating the reference-point position of the panel within the scope of the simulator. The rest of 6 the adjustment process is like that previously described 7 herein.
9 Depending on the design of the switch, especially if it is bistable, on the reference-point indicator, the switching 11 point will migrate along the particular direction of travel 12i; in relation to the ideal precise reference-point position of 13i¦ the panel, resulting in a "hysteresis" dictated by the 14ll spatial delay on the part of the switch in relation to the 151¦ direction of travel and causing for example the position 161 detector to maintain a slightly higher value, a lower number 17ll of counts for example, as the panel moves into the gate-open 18 ! limiting position once the indicator has been tripped than 19i during the reverse motion out of the gate-open limiting 20l position as far as the oppositely directed trippiny of the 21l indicator. If the previously described synchronization and 22l storage are carried out when the system is operated for the 23 first time, the hysteresis will have no effect if the 24 particular position is arrived at by traveling beyond the reference-point position in one direction. This is the case 26~ at the limitiny positions of the panel. The stop positions 27lcan basically be arrived at in either direction, so that in 28~this case the hysteresis or directionally dependent delay on 29 the part of the indicator-switch can lead to variations in the location of the gate panel in the stop position. This I
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1 situation, however, is usually insignificant because the 2!! motion of the panel is not opposed by any mechanical resis-3~I tance as it is when assuming a limiting position. This means 4l accordingly that the stop positions can be provided with 5,l enough "play" around the desired value that the imprecision 6 deriving from the hysteresis will have no effect. If on the 7 other hand i~ is important for whatever reason for stop 8 positions that are arrived at from either direction of 9 travel to be especially precisely located, the delay on the part of the switch can be dictated by means of another 11 memory and their value absolutely employed for purposes of 12 , correction to the extent that a stop position arrived at 13 from both directions can be assumed precisely at one and the 14 i same position. The stop position can simultaneously be 15~ located with no problem within the spatial hysteresis range 16 ' of such a hysteresis-subject reference-point indicator. The 17 reference-point indicator will then be activated during 18 motion along one and/or the other direction out of such an 19 actually readjusted stop positionO
20 ;
21 Pxeferred embodiments will be evident from the subsidiary 22 claims.
23 l 24 One embodiment of the invention will now be described with 25 ' reference to the drawing, wherein 2~
27 Figure 1 is a block diagram illustrating the 28 controls in accordance with an embodimPnt employed 29 by way of example and 30 ' ~3331Z
1ll Figure 2 is a schematic illustration of a magneti-2 I cally activated bistable switch for a reference-3, point indica~or in accordance with the same 4 , embodiment.
6i 7~1 Figure is a schematic block diagram of a switching device 1 81 that comprises a counter 2 as p~rt of a position detector 9 I and a comparator 3. Connected to switching device 1 are a 10l pulse generator 4, the switch of a reference-point indicator 11 5, a memory 6, an input-switch device 11, power-supply 12 1 controls 12, and a counter-setting display 13. Switching 13 ¦ device 1 has additional connections and switchgear in 14 1 accordance with the particular functions of the aforesaid individual circuit groups.
17 The pulse generator 4 in the illustrated embodiment compris-18 es a generator disk 7 that is non-rotationally connected to 19 the driveshaft o~ a motor in a way that is not illustrated.
20 I Mounted stationary next to the generator are two scanning 21 'I devices 8 in the form of light barriers aimed in an 22 , unillustxated way at radially different circumferential 23 i tracks on generator disk 7. One o~ the two scanning devices 24 ` ~ diametrically opposite the axis of rotation of genarator 25 diSk 7 is aimed at a radially farther out track containing a ~26 slot 9 that curves along the track, and the other scanning ;1 27 ~device is aimed at a radially farther in track containing a ~28 I slot 10. Slots 9 and 10 are not diamstrically oppoisite and 29 1 accordingly enclose a more acute angle in one circumferen-30 , tial direction than they do in the other. Whenever the slot ' I
~ 15 -1 9 on rotating generator disk 7 arrives at the light barrier 2 of one of the scanning devices 8, one pulse per rotation is 3 released. Since the speed of the shaft corresponds to the 4 length of the path travel~d by the panel of the gate, the number of pulses that are emitted by slots 9 and/or 10 in 6 conjunction with scanning devices 8 as generator disk 7 7 rotates and that repeatedly trip the counter 2 in the 8 ' position detector represents a measure of how far the panel 9 I has traveled. Since slots 9 and 10 are not diametrically opposite each o~her, the interval between a pulse generated 11 by slot 9 and one generated by slot 10 will be shorter in 12 one direction than in the other. It is accordingly possible 13 to determine what direction the motor is rotating in and 14' hence what direction the panel is moving in by means of pulse generator 4.
17 A preferred embodiment of reference-point indicator 5, only 1~ the switch of which is illustrated in Figure 1, will now be 19 described in greater detail with reference to Figure 2. One 2Q section of the area of a frame 14 that is to be mounted in 21 an opening in a wall is illustrated alon~ with part of the 22 edge of the panel 15 of a ~ate that is also only partly 23 illustrated and that is to be mounted in an unillustrated 24 way such that it can slide back and forth on guide rollers or similar structures in also unillustrated tracks secured 26 to the frame.
28 A switched component mounted on frame 14 comprises a perma-29 nent magnet 16 that pivots on an axis 17 mor~ or less within a plane that parallels the panel as it travels by it. Magnet ~331~2 1 l 16 is polarized in a direction diametrical in relation to 2 ~ axis 17 with one pole in the magnet's pivoting range point-3 1 ing toward panel 15 and ~he reciprocal pole within the 4 1l limited pivoting range of panel 15. Mounted on panel 15 is a 5l1 switching magnet 18 in the form of another permanent magnet 6 ¦ with one pole pointing away from frame 14 and its reciprocal 7 1¦ pole toward the frame. The switching magnet 18 mounted 8l¦ stationary on panel 15 passes magnet 15 as the panel travels 9 l through the reference point position defined by the position 10 l in space of the switching device in relation to magnet 16 11' and switching magnet 18 with its reciprocal pole exerting 12 magnetic attraction on the pole of magnet 16. With the 13 position of the magnets in Figure 2 as a point of departure 14 and with the panel traveling in the direction indicated by 15~ the arrow pointing away from switching magnet 18, switching 16¦ magnet 18 will as it approaches magnet 16 exert an increas-171 ing more powerful attraction, pivoting the magnet on its 181 axis 17 as it passes by.
19 1' 20j The switching device in reference-point indicator 5 is 21 bistable as will now be described. The reciprocal pole of 22 magnet 16, the pole that faces away from panel 15 points, in 23 the illustrated pivoted state, toward a switch 19 that is 24¦ maintained activated in an unillustrated way while magnet 16 25l is in this position. As long accordingly as magnet 16 ~6l remains in the pivoted position illustrated in Figure 2, 27 resting against a stop 21, switch 19 will remain active 28 whether open or closed. As switching magnet 18 passes by in 29 the direction indicated by the arrow in Figure 2, magnet 16 ~0 pivots on axis 17 and arrives from its position against stop ~33~:12 1 21 in its other limiting position against another stop 22.
2 Outside of the arc described by the reciprocal-pole end of 3 magnet 16 and at the midpoint between stops 21 and 22, 4 another and small permanent magnet 20 is mounted stationary on the frame of the gate to stabilize magnet 16 in one or 6 the other pivoted position. Stabilizing magnet 20 is posi-7 tion0d with its reciprocal pole pointing toward the identi-8 cally polarized reciprocal pole of permanent ma~net 16, 9 resulting in a magnetic repulsion between the stationary stabilizing magnet 20 and the pivoting permanent magnet 16, 11 which is accordingly retained by the former in one of its 12 two limiting positions. Stabilizing magnet 20, due to its 13 size and position, does not act as powerfully on permanent 1~ magnet 16 as does switching magnet 18, which, as it passes magnet 16, can entrain it against the repulsion of stabiliz-16 ; ing magnet 20. As soon as permanent magnet 16 has exceeded 17 the midpoint in its orientation toward stabilizing magnet 18 20, the latter, in conjunction with the farther displaced 19 switching magnet 18, shifts it into the associated limitin~
position against stop 21 or 22. When it is resting against 21 stop 21, switch 19 is activated and, when it is resting 22 against stop 22, swi~ch 19 is disengaged. Thus, every time 23 permanent ma~net 16 pivots from one limiting position into :
24 , the other, switch 19 is tripped, an event tha is evaluated ' as a signal for governing counter 2 in the position detec-26 tor, compulsorily zeroing the counter in the present exam-27 ~le, whether the switch is tripped from the activa~ed into 28 the de-activated or vice versa.
~2~33~
1 This embodiment is started up for the first time and operat-2 ed in accordance with the basic procedure already described 3 herein. When the system is started up for the first time it 4 is possible for the bistable reference-point indicator to be in the posi~ion that it is intended to be in when the panel 6 travels past the reference-point position for the first 7 time. With reerence to Figure 2, accordingly, p~rmanent 8 magnet 16 might not be in the illustrated limiting position 9 but in the other limiting position, resting against stop 22, while switching magnet 18 moves in the direction indicated 11 by the arrow. Switch 19 would accordingly not be tripped 12 during this preliminary stage in ~he present embodiment, and 13 no synchronization pulse would be generated for zeroing 14 counter 2. For this reason the panel is basically shifted up j to and beyond the reference-point position with a scanning 16 ll generator, stopped, and shifted beyond the reference-point 17 ' ! position in the opposite direction again when the system is 18 , started up for the first time because the reference-point 19 I indicator will in any case be activated at least as soon as I the panel travels through the reference-point position for 21 ` the second time, meaning in the present embodiment that 22 permanent magnet 16 will pivot and switch 19 will be tripped 23 from one state into the other. This measure ensures that 24 counter will be zeroed, so that, as the panel continues to travel, the distance-depe~dent pulses generated by pulse 26 generator 4 as generator disk 7 turns and scanning devices 8 27 are disengaged will continue to be counted. Once the next 28 stop position or limiting position is arrived at, a switch 29 in input-switch device 11 that is associated with that position will be activated, transerring the counter ou~put ~ 3:~2 1 ~ to an address in memory 6. As soon as the panel travels 2 through the reference-point position in the opposite direc-3 tion, the counter is re-zeroed due to the activation of the 4 switch 19 in reference-point indicator 5 and, as the panel l'l continues to travel, the distance-dependent pulses will 6 l~ advance the counter as previously described herein until the 7 'I next stop position or limiting position in that direction is 8 l¦ arrived at, upon which the associated switch in input-switch 9 I device 11 will be activated and ~he counter output will be 1 entered at an address in memory 6 that corresponds to that ~ position. The output signals from the counter occur in the 12 il form of a dual-coded signal in several parallel lines, and 13 l¦ input-switch device 11 enters them in the memory in parallel 14 'i~, and in that form.
!l 16 ! It is accordin~ly especially simple to start up the gate 17 , system for the first time in that the gate only has to be 18 1 shifted into the separate positions in a scanning operation 19 , (dead-center switch), upon which the switch that is associ-1 ated with that position in the input-switch device is 21 ¦ activated. It is only necessary to make sure that the 22 l reference-point position is traveled through in one direc-23 ¦ tion and then in the other direction. As \soon as all the 24 I¦ positions have been traveled through and the associated I counter outputs entered in the memory, the gate will be 26 ' ready to operate. An appropriate keyboard or radio signal is 27 l, employed to turn on the drive mechanism and determine what 28 ,i position the panel is to be shifted into. This turns on the 29 1~ motor, and the counter simultaneously begins to determine ! every position of the panel as it moves. Provldin~ the ~i :~Z~31;2 1 target position dictates the corresponding memory address, 2 l and a comparatox constantly monitors the output signal from 3 l that address along with that of the coun~er. When the two 4 outputs coincide, the comparator will release an output ~ signal to power-supply controls 12, which interrupts the 6 current to the motor and optionally releases further dis-7 plays etc.
9 Counter-setting display 13 can display the state of the counter, simplifying its supervision, along with the posi-11 tion of the gate above or below the reference-point posi-12 tion, etc.
14 Since the present drive mechanism and controls depend on external power, measures must be taken to prevent malfunc-16 tion on the part of the gate when the power fails and is 17 I restored. There are two standards to be kept in mind in the 18 event of a power failure. On the one hand, the power failure 19 can either be very brief or occur at night. In other words, it may not be noticed, in which case it must be ensured that 21 ~ the next time the drlve mechanism is turned on the position 22 of the panel will correspond with the value in the position 23 , detector~ If, on the other hand, an outage occurs during 24 i' which the gate panel has to be shifted manually, it must also be ensured that the position of the panel corresponds 26 , with the value in the position detector once power has been 27 restored.
~9 For this purpose initially the reference-point indicator is bistable, basicall~ indicating whether the panel is with .
331;2 1 respect to its switching component, switching magnet 18, 2 above or below the reference-point position. To ensure that 3 this will occur even when there is a power failure and ~he 4 gate is shifted into another position by hand, the reference-point indicator in the present embodiment is 6 constructed out of permanent magnets, so that permanent 7 magnet 16 will be triggered by the passage of switching 8 magnet 18 even when there is no power. Thus, when power is 9 ~ restored, reference-point indicator will always reliably l indicate the position of the panel. This information is 11 utilized to ensure that the electric drive mechanism, now 12 jl functioning again, can initially only move the panel toward 13 ll and beyond the re~erence-point position. This in turn 14 , ensures that the counter in the position detector will again ~ be properly synchronized with the position of the panel. The 16 counter can basically be a non-volatile switch element, 17 meaning that it will retain its count even in the absence of 18 power. This advantage, however, would only be practical if 19 1 the counter could be reset in accordance with the new panel , position during a power outage and manual operation. This 21 I would of course be possible in an electric counter only if 22 ,I there is an auxiliary power source. This is why the counter 23 i in one especially preferred embodiment is constructed of 24 simple circuitry that losec its information in the event of a power failure. The aforesaid necessity of shifting the 26 panel only toward the re~erence-point position when power is 27 re~tored ensures that the counter will retain the position 28 it was in when first turned on due to activation of the 29 reference-point indicator. It is accordingly necessary only ~9331~
1 to construct the memory out of non-volatile circuitry to 2 allow reliable operation subsequent to a power failure.
4 The switch 19 illustrated, only schematically by the way, in Figure 2 can for example be a reed contact of the commer-6 cially available magnetically activated type. Stabilizing 7 magnet 20 could of course also be replaced with another type 8 of magnetic system, with two small magnets for instance, 9 each associated with one of the two stops and exerting magnetic force on permanent magnet 16 in such a way as to 11 attract it in~o one of its two limiting positions.
~8
16 Before the normal operating controls are activated for the 17 first time by a third party the gate panel will be randomly 18 positioned and the position detector, memoxy, and, in the 19 case of a bistable sys~em, the reference-point indicator as well will be in a state of indefinite readout. The actual 21 state of the panel that is to be operated for the first time 22 must accordin~ly be matched with that of the controls. The 23 reference-point position is accordingly established between 24l the limiting positions and outside of any stop positions as previously described herein. As will be described in detail 26 later herein, this can be done by an appropriately locally 27 determined positioning of the reference-point indicator on 28 the frame or track of the gate etc. or within the scope of a 29 panel-motion simulator. The panel is then moved manually with the assistance of a pressure sensor ~dead man's . .
i ~ 33~;~
1 operation) toward and beyond the reference-point position.
2 The reference-point indicator, at least if it is monostable, 3 simultaneously emits a synchronization signal to the posi-4 tion detector that sets it at a specific value, especially zero. As the gate continues to travel toward the next stop 6 position or limiting position, the position detector is 7 tripped and retained in the next desired position. The value 8 then indicated at the output terminal of the position 9 detector is entered by means of an input key into an address in the memory that is associated with the stop position or 11 limiting position, and the value is retained constantly at 12 that address. The panel is then shifted into the next stop 13 position or limiting position and retained there, upon which 14~l the value of the position detector that corresponds to this 15 l¦ position is transferred by means of another input switch to 16 1 another address in the memory that is associated with the 17 I position. For the purpose o~ storing the stop position or 18 1 limiting position on the other side of the reference-point 19 ! position the gate panel is now shifted in the opposite 20 ¦¦ direction beyond reference-point position, so that the 211 position detector is reset to the prescribed value, prefera-22¦ bly zero. As the panel continues to move, ~he next adjacent 23l stop position or limiting position is activated and the ~4 l¦ resulting indicating value on the part of the position 25~,1 detector entered by means of an input key at an address 26 provided for that position in the memory.
28 In an initial and preferred embodiment of the invention the 29 position detector is compulsorily reset by the ~ynchroniza-3G tion signal or by each synchronization signal to the ~33~
li prescribed value, especially zero, and varies its value in 2 accordance with the distance traveled by the panel to the 3 next stop position or limiting position. Constant comparison 4 of the output of the position detector with the values stored in the memory results, once a prescribed stop posi-6 tion or the limiting position beyond the reference-point 7 position has been attained, in coincidence betwèen the 8 output signals from the position detector and those from the 9l associated memory address, activating current-supply con-10,l trols that stop the motor. If the panel is shifted out of 11 l this position in the opposite direction, the output Qf the 12 , position detector can be continuously set back so that, in 13 I the case of a stop position located upstream of the 14 reference-point position in this direction, the output of the position detector will coincide with that of the associ-16 ated memory address. When this stop position is activated, 17l the motor can be turned off again by appropriate activation 18 1l of the current-supply controls. The position detector can 19 l¦ similarly be disengaged in accordance with the motion of the 20,' panel beyond the reference-point position by compulsorily 21 i resetting the detector to the prescribed value, preferably 22 1l zero, as the panel travels through the reference-point 23l position. A negative value is of course also possible.
24ll For a directionally dependent back-and-forth disengagement 26 , of the position detector of this type it is necessary to be 27 able to detect the particular direction that the panel is 28 traveling in. A pulse generator accordingly allows signals 29 ~ to be detected in accordance with the path or with the 30 I direction of rotation of the motor. Preferred ror this ,~
l~ - 8 -., ~3~
1 purpose is a generator disk that is driven by the motor, 2 especially its output shaft, and has two scanning tracks and 3 at least two signal-generating structures that enclose 4 different angles.
5,l 6l, It is on the other hand also possible to disengage the 7 i position detector by summing up from a passage through the 8 j reference-~oint position independent of the direction of 9 travel. If there is in this case a stop position hetween the lOi reference-point position in the particular operating range, 11 another memory output must be made available to provide for 12 comparison the value summed up during the motion back to the 13 reference-point position at the stop position because the 14 panel that is shifted out beyond the stop position will sum up, when the direction is reversed, the distance between the ~6 stop position and the limiting position with reference to 17 the information from the position detector.
19 Another possibility is to completely change the disengage-ment of the position detector as the panel travels through 21 the reference-point position once the values for the limit-2~ I ing po~ition or stop position have been entPred to the 23 extent that the value obtained from the memory address 24 associated with the prescribed stop position or limitiny position is entered in the position detector every time the 26 panel travels throu~h the reference-point position. The 27 , counter can then count back from this value to the pre-28 ` scribed value, pre~erably zero, as the gate panel travels ~9 into the desired position, generating a signal that !
l~g3~i~
1ll activates the current-supply controls once the value or the 2~ zero is attained.
3,l 4~l It must be ensured that restarting the gate-drive mechanism 5,l subsequent to a power failure, even a very brief outage, 6I will not damage it. This can basically be done by designing 7l the overall controls such that they will not lose theix 8' signal content when the power is interrupted. This approach 9l is admittedly comparatively expensive, especially in rela-10l tion to the position detector. It is also necessary to 11l ensure that the panel is not shifted manually, by means of a12, hand chain for example, duriny a power outage into another 13l position that does not correspond to the one indicated by 14l the position detector. The memory in one especially pre-15¦ ferred embodiment is accordingly a "non-volatile" switching 16 mechanism, so that its contents will not change or get lost 17 during the outage. The position detector on the other hand 18 must be a "volatile" switching mechanism, so that the 19 particular positional value will be erased when the power fails. The reference-point indicator, finally, will have a 21 bistable switch component that will even during a pow~r 22 outage indicate which direction of the two the panel is 23 traveling in from the reference-point position. This infor-24 i mation from the bistable switch is utilized to ensure, once 25 , the system has been turned on again, that the panel can only 26 travel toward the reference-point position and ~hat, once it 27 has traveled beyond the reference point, it will reset the 28 position detector as previously described herein. This 29 measure will re-establish the synchronization between the 3o !
,, ;
~33~2 1 position of the panel and the output value of the position 2 detector subse~uent to a power failure.
4 When the power failure lasts longer and the panel has to be shifted by hand as is regularly provided for in practice, it is preferable to employ a bistable indicator-switch that 7 will appropriately vary its state as the panel is shifted 8 through the reference point position by hand. This switch 9 can be switched by muscle power and is preferably a magneti-cally activated bistable switch of the type described in 11 greater detail later herein with reference to the drawing.
13 Depending on the design of this bistable switch for the 14 ~ reference-point indicator it is possible for no pulse to be lS emitted when the panel travels beyond the reference-point 16 position in the direction in which the bistable switch has 17, ii already been tripped. In this case the position of the panel 18, is synchronized with the value emitted by the position 19, detector and the limiting position or stop position if any 20l is entered in such a wby that the finally installed gate 21 panel is initially shifted with a manually operated scanning 22¦ swltch ~dead-man operation) in one direction and then in the 23l' othPr direction beyond the reference~poin~ position. This 24 measure will ensure that, at least when the panel travels 25~ past the reference-point position for the second time, the 26 position detector will be reset to the prescribed value, 27 especially zer3, ensuring the aforesaid adjustment in 28 accordance with first-time operation.
~331~
1 The reference-point indicator can be positioned where it 2 will be directly activated by the panel, having for example 3 a switched component that is mounted station~ry on the Erame 4 of the gate, on the panel track, or in a similar location and activated by a switching component entrained along with 6 the panel. It will accordingly be generally possible without 7 any problem to mount the switching component and the 8 switched component on the frame or track and on the panel at 9 the factory before the gate is installed, eliminating the necessity for such labor while the gate is being installed.
11 It is also possible, especially if the switch is magnetical-12 ly activated, to provide a tolerance field, eliminating the 13 ll need for any adjustments once the gate has been installed.
~ It is also possible to realize the reference-point indicator 16 '~ within the scope of a very down-scaled panel-motion simula-17 tor. The switched component will again be stationary in this 18 , version and the switching component mounted on a part that 19 ll imitates the motion of the panel at a greatly reduced scale, 20 ll the nut for instance of a spindle connected to the output 21 1I terminal of a transmission positioned downstream of the 22 1, motor. The actual position of the panel can be synchronized 23 '' with that of the spindle nut that dictates the reference-24 ll point position once the gate has been installed by simply 25 il attaching the spindle nut, which can for this purpose be 26 ~plit in two axially, at an appropriate point where it 27 travels along the spindle. The panel is then ~or example 28 shifted, once it has been installed, into the gate-closed 29 position with ssanning switches (dead man's switches) and the nut secured to the spindle in such a way that, once the 11 panel has been shifted out of the gate-closed position by 2¦ means of the motorized drive mechanism, the spindle nut and 3l the switching component will travel past the stationary , switched component, dictating the reference-point position of the panel within the scope of the simulator. The rest of 6 the adjustment process is like that previously described 7 herein.
9 Depending on the design of the switch, especially if it is bistable, on the reference-point indicator, the switching 11 point will migrate along the particular direction of travel 12i; in relation to the ideal precise reference-point position of 13i¦ the panel, resulting in a "hysteresis" dictated by the 14ll spatial delay on the part of the switch in relation to the 151¦ direction of travel and causing for example the position 161 detector to maintain a slightly higher value, a lower number 17ll of counts for example, as the panel moves into the gate-open 18 ! limiting position once the indicator has been tripped than 19i during the reverse motion out of the gate-open limiting 20l position as far as the oppositely directed trippiny of the 21l indicator. If the previously described synchronization and 22l storage are carried out when the system is operated for the 23 first time, the hysteresis will have no effect if the 24 particular position is arrived at by traveling beyond the reference-point position in one direction. This is the case 26~ at the limitiny positions of the panel. The stop positions 27lcan basically be arrived at in either direction, so that in 28~this case the hysteresis or directionally dependent delay on 29 the part of the indicator-switch can lead to variations in the location of the gate panel in the stop position. This I
331sZ
1 situation, however, is usually insignificant because the 2!! motion of the panel is not opposed by any mechanical resis-3~I tance as it is when assuming a limiting position. This means 4l accordingly that the stop positions can be provided with 5,l enough "play" around the desired value that the imprecision 6 deriving from the hysteresis will have no effect. If on the 7 other hand i~ is important for whatever reason for stop 8 positions that are arrived at from either direction of 9 travel to be especially precisely located, the delay on the part of the switch can be dictated by means of another 11 memory and their value absolutely employed for purposes of 12 , correction to the extent that a stop position arrived at 13 from both directions can be assumed precisely at one and the 14 i same position. The stop position can simultaneously be 15~ located with no problem within the spatial hysteresis range 16 ' of such a hysteresis-subject reference-point indicator. The 17 reference-point indicator will then be activated during 18 motion along one and/or the other direction out of such an 19 actually readjusted stop positionO
20 ;
21 Pxeferred embodiments will be evident from the subsidiary 22 claims.
23 l 24 One embodiment of the invention will now be described with 25 ' reference to the drawing, wherein 2~
27 Figure 1 is a block diagram illustrating the 28 controls in accordance with an embodimPnt employed 29 by way of example and 30 ' ~3331Z
1ll Figure 2 is a schematic illustration of a magneti-2 I cally activated bistable switch for a reference-3, point indica~or in accordance with the same 4 , embodiment.
6i 7~1 Figure is a schematic block diagram of a switching device 1 81 that comprises a counter 2 as p~rt of a position detector 9 I and a comparator 3. Connected to switching device 1 are a 10l pulse generator 4, the switch of a reference-point indicator 11 5, a memory 6, an input-switch device 11, power-supply 12 1 controls 12, and a counter-setting display 13. Switching 13 ¦ device 1 has additional connections and switchgear in 14 1 accordance with the particular functions of the aforesaid individual circuit groups.
17 The pulse generator 4 in the illustrated embodiment compris-18 es a generator disk 7 that is non-rotationally connected to 19 the driveshaft o~ a motor in a way that is not illustrated.
20 I Mounted stationary next to the generator are two scanning 21 'I devices 8 in the form of light barriers aimed in an 22 , unillustxated way at radially different circumferential 23 i tracks on generator disk 7. One o~ the two scanning devices 24 ` ~ diametrically opposite the axis of rotation of genarator 25 diSk 7 is aimed at a radially farther out track containing a ~26 slot 9 that curves along the track, and the other scanning ;1 27 ~device is aimed at a radially farther in track containing a ~28 I slot 10. Slots 9 and 10 are not diamstrically oppoisite and 29 1 accordingly enclose a more acute angle in one circumferen-30 , tial direction than they do in the other. Whenever the slot ' I
~ 15 -1 9 on rotating generator disk 7 arrives at the light barrier 2 of one of the scanning devices 8, one pulse per rotation is 3 released. Since the speed of the shaft corresponds to the 4 length of the path travel~d by the panel of the gate, the number of pulses that are emitted by slots 9 and/or 10 in 6 conjunction with scanning devices 8 as generator disk 7 7 rotates and that repeatedly trip the counter 2 in the 8 ' position detector represents a measure of how far the panel 9 I has traveled. Since slots 9 and 10 are not diametrically opposite each o~her, the interval between a pulse generated 11 by slot 9 and one generated by slot 10 will be shorter in 12 one direction than in the other. It is accordingly possible 13 to determine what direction the motor is rotating in and 14' hence what direction the panel is moving in by means of pulse generator 4.
17 A preferred embodiment of reference-point indicator 5, only 1~ the switch of which is illustrated in Figure 1, will now be 19 described in greater detail with reference to Figure 2. One 2Q section of the area of a frame 14 that is to be mounted in 21 an opening in a wall is illustrated alon~ with part of the 22 edge of the panel 15 of a ~ate that is also only partly 23 illustrated and that is to be mounted in an unillustrated 24 way such that it can slide back and forth on guide rollers or similar structures in also unillustrated tracks secured 26 to the frame.
28 A switched component mounted on frame 14 comprises a perma-29 nent magnet 16 that pivots on an axis 17 mor~ or less within a plane that parallels the panel as it travels by it. Magnet ~331~2 1 l 16 is polarized in a direction diametrical in relation to 2 ~ axis 17 with one pole in the magnet's pivoting range point-3 1 ing toward panel 15 and ~he reciprocal pole within the 4 1l limited pivoting range of panel 15. Mounted on panel 15 is a 5l1 switching magnet 18 in the form of another permanent magnet 6 ¦ with one pole pointing away from frame 14 and its reciprocal 7 1¦ pole toward the frame. The switching magnet 18 mounted 8l¦ stationary on panel 15 passes magnet 15 as the panel travels 9 l through the reference point position defined by the position 10 l in space of the switching device in relation to magnet 16 11' and switching magnet 18 with its reciprocal pole exerting 12 magnetic attraction on the pole of magnet 16. With the 13 position of the magnets in Figure 2 as a point of departure 14 and with the panel traveling in the direction indicated by 15~ the arrow pointing away from switching magnet 18, switching 16¦ magnet 18 will as it approaches magnet 16 exert an increas-171 ing more powerful attraction, pivoting the magnet on its 181 axis 17 as it passes by.
19 1' 20j The switching device in reference-point indicator 5 is 21 bistable as will now be described. The reciprocal pole of 22 magnet 16, the pole that faces away from panel 15 points, in 23 the illustrated pivoted state, toward a switch 19 that is 24¦ maintained activated in an unillustrated way while magnet 16 25l is in this position. As long accordingly as magnet 16 ~6l remains in the pivoted position illustrated in Figure 2, 27 resting against a stop 21, switch 19 will remain active 28 whether open or closed. As switching magnet 18 passes by in 29 the direction indicated by the arrow in Figure 2, magnet 16 ~0 pivots on axis 17 and arrives from its position against stop ~33~:12 1 21 in its other limiting position against another stop 22.
2 Outside of the arc described by the reciprocal-pole end of 3 magnet 16 and at the midpoint between stops 21 and 22, 4 another and small permanent magnet 20 is mounted stationary on the frame of the gate to stabilize magnet 16 in one or 6 the other pivoted position. Stabilizing magnet 20 is posi-7 tion0d with its reciprocal pole pointing toward the identi-8 cally polarized reciprocal pole of permanent ma~net 16, 9 resulting in a magnetic repulsion between the stationary stabilizing magnet 20 and the pivoting permanent magnet 16, 11 which is accordingly retained by the former in one of its 12 two limiting positions. Stabilizing magnet 20, due to its 13 size and position, does not act as powerfully on permanent 1~ magnet 16 as does switching magnet 18, which, as it passes magnet 16, can entrain it against the repulsion of stabiliz-16 ; ing magnet 20. As soon as permanent magnet 16 has exceeded 17 the midpoint in its orientation toward stabilizing magnet 18 20, the latter, in conjunction with the farther displaced 19 switching magnet 18, shifts it into the associated limitin~
position against stop 21 or 22. When it is resting against 21 stop 21, switch 19 is activated and, when it is resting 22 against stop 22, swi~ch 19 is disengaged. Thus, every time 23 permanent ma~net 16 pivots from one limiting position into :
24 , the other, switch 19 is tripped, an event tha is evaluated ' as a signal for governing counter 2 in the position detec-26 tor, compulsorily zeroing the counter in the present exam-27 ~le, whether the switch is tripped from the activa~ed into 28 the de-activated or vice versa.
~2~33~
1 This embodiment is started up for the first time and operat-2 ed in accordance with the basic procedure already described 3 herein. When the system is started up for the first time it 4 is possible for the bistable reference-point indicator to be in the posi~ion that it is intended to be in when the panel 6 travels past the reference-point position for the first 7 time. With reerence to Figure 2, accordingly, p~rmanent 8 magnet 16 might not be in the illustrated limiting position 9 but in the other limiting position, resting against stop 22, while switching magnet 18 moves in the direction indicated 11 by the arrow. Switch 19 would accordingly not be tripped 12 during this preliminary stage in ~he present embodiment, and 13 no synchronization pulse would be generated for zeroing 14 counter 2. For this reason the panel is basically shifted up j to and beyond the reference-point position with a scanning 16 ll generator, stopped, and shifted beyond the reference-point 17 ' ! position in the opposite direction again when the system is 18 , started up for the first time because the reference-point 19 I indicator will in any case be activated at least as soon as I the panel travels through the reference-point position for 21 ` the second time, meaning in the present embodiment that 22 permanent magnet 16 will pivot and switch 19 will be tripped 23 from one state into the other. This measure ensures that 24 counter will be zeroed, so that, as the panel continues to travel, the distance-depe~dent pulses generated by pulse 26 generator 4 as generator disk 7 turns and scanning devices 8 27 are disengaged will continue to be counted. Once the next 28 stop position or limiting position is arrived at, a switch 29 in input-switch device 11 that is associated with that position will be activated, transerring the counter ou~put ~ 3:~2 1 ~ to an address in memory 6. As soon as the panel travels 2 through the reference-point position in the opposite direc-3 tion, the counter is re-zeroed due to the activation of the 4 switch 19 in reference-point indicator 5 and, as the panel l'l continues to travel, the distance-dependent pulses will 6 l~ advance the counter as previously described herein until the 7 'I next stop position or limiting position in that direction is 8 l¦ arrived at, upon which the associated switch in input-switch 9 I device 11 will be activated and ~he counter output will be 1 entered at an address in memory 6 that corresponds to that ~ position. The output signals from the counter occur in the 12 il form of a dual-coded signal in several parallel lines, and 13 l¦ input-switch device 11 enters them in the memory in parallel 14 'i~, and in that form.
!l 16 ! It is accordin~ly especially simple to start up the gate 17 , system for the first time in that the gate only has to be 18 1 shifted into the separate positions in a scanning operation 19 , (dead-center switch), upon which the switch that is associ-1 ated with that position in the input-switch device is 21 ¦ activated. It is only necessary to make sure that the 22 l reference-point position is traveled through in one direc-23 ¦ tion and then in the other direction. As \soon as all the 24 I¦ positions have been traveled through and the associated I counter outputs entered in the memory, the gate will be 26 ' ready to operate. An appropriate keyboard or radio signal is 27 l, employed to turn on the drive mechanism and determine what 28 ,i position the panel is to be shifted into. This turns on the 29 1~ motor, and the counter simultaneously begins to determine ! every position of the panel as it moves. Provldin~ the ~i :~Z~31;2 1 target position dictates the corresponding memory address, 2 l and a comparatox constantly monitors the output signal from 3 l that address along with that of the coun~er. When the two 4 outputs coincide, the comparator will release an output ~ signal to power-supply controls 12, which interrupts the 6 current to the motor and optionally releases further dis-7 plays etc.
9 Counter-setting display 13 can display the state of the counter, simplifying its supervision, along with the posi-11 tion of the gate above or below the reference-point posi-12 tion, etc.
14 Since the present drive mechanism and controls depend on external power, measures must be taken to prevent malfunc-16 tion on the part of the gate when the power fails and is 17 I restored. There are two standards to be kept in mind in the 18 event of a power failure. On the one hand, the power failure 19 can either be very brief or occur at night. In other words, it may not be noticed, in which case it must be ensured that 21 ~ the next time the drlve mechanism is turned on the position 22 of the panel will correspond with the value in the position 23 , detector~ If, on the other hand, an outage occurs during 24 i' which the gate panel has to be shifted manually, it must also be ensured that the position of the panel corresponds 26 , with the value in the position detector once power has been 27 restored.
~9 For this purpose initially the reference-point indicator is bistable, basicall~ indicating whether the panel is with .
331;2 1 respect to its switching component, switching magnet 18, 2 above or below the reference-point position. To ensure that 3 this will occur even when there is a power failure and ~he 4 gate is shifted into another position by hand, the reference-point indicator in the present embodiment is 6 constructed out of permanent magnets, so that permanent 7 magnet 16 will be triggered by the passage of switching 8 magnet 18 even when there is no power. Thus, when power is 9 ~ restored, reference-point indicator will always reliably l indicate the position of the panel. This information is 11 utilized to ensure that the electric drive mechanism, now 12 jl functioning again, can initially only move the panel toward 13 ll and beyond the re~erence-point position. This in turn 14 , ensures that the counter in the position detector will again ~ be properly synchronized with the position of the panel. The 16 counter can basically be a non-volatile switch element, 17 meaning that it will retain its count even in the absence of 18 power. This advantage, however, would only be practical if 19 1 the counter could be reset in accordance with the new panel , position during a power outage and manual operation. This 21 I would of course be possible in an electric counter only if 22 ,I there is an auxiliary power source. This is why the counter 23 i in one especially preferred embodiment is constructed of 24 simple circuitry that losec its information in the event of a power failure. The aforesaid necessity of shifting the 26 panel only toward the re~erence-point position when power is 27 re~tored ensures that the counter will retain the position 28 it was in when first turned on due to activation of the 29 reference-point indicator. It is accordingly necessary only ~9331~
1 to construct the memory out of non-volatile circuitry to 2 allow reliable operation subsequent to a power failure.
4 The switch 19 illustrated, only schematically by the way, in Figure 2 can for example be a reed contact of the commer-6 cially available magnetically activated type. Stabilizing 7 magnet 20 could of course also be replaced with another type 8 of magnetic system, with two small magnets for instance, 9 each associated with one of the two stops and exerting magnetic force on permanent magnet 16 in such a way as to 11 attract it in~o one of its two limiting positions.
~8
Claims (42)
1. System for controlling the motorized drive mechanism that shifts a gate panel or similar structure back and forth between two limiting positions and optionally through one or more intermediate stop positions along a prescribed path, especially intended for overhead gates, with a switching device that determines the assumption of a particular limiting position or stop position and that emits signals that are utilized to switch off the supply of power to the motor, characterized by at least one reference-point indicator (5) that generates a synchronization signal every time the panel travels through a prescribed reference-point position between and outside the limiting posi-tions, by a memory (6) that accepts, stores, and outputs the limiting positions and the optionally at least one stop position, and by a position detector (2 & 4) that outputs a value representing every actual position the panel travels through as it moves, that obtains a positional-value readjustment in accordance with the synchronization signal, and that releases an output signal for interrupting the supply of power to the motor in accordance with the direction the reference-point position is traveled through in and with the accordingly targeted limiting position or with the stop position of the panel along that direction and optionally dictated by controls in agreement with the associated output from the memory once that position is arrived at.
2. System as in Claim 1, characterized in that the indicator (5), the memory (6), and/or the position detector (2 & 4), are digital switch devices.
3. System as in Claim 1, characterized in that the indicator (5) is a bistable switch and the memory (6) a non-volatile electric component such that, depending on the switching state of the indicator, the panel can be shifted out of its current position only toward the reference-point position when the motorized drive mechanism is switched on and the associated adjustment of the position detector (2) is absent or lost, subsequent to a power failure for in-stance.
4. System as in Claim 2 or 3, characterized in that the position detector (2 & 4) has a pulse counter (2), the counting input terminal of which is connected to a pulse generator (4) that derives its pulses from the rotation of the motorized drive mechanism.
5. System as in Claim 4, characterized in that the pulse generator (4) has a generator disk (7) that is secured to a rotating component of the motor, especially to its driveshaft, that rotates along with it, and that is associated with a scanning device (8) mounted stationary on the housing with its physical informational state digitally altered once or more often every time the generator disk rotates once.
6. System as in Claim 5, characterized in that the generator disk (7) is perforated or slotted and in that the scanning device (8) has a light barrier, with the circumfer-ence of the disk that has the perforation or slot disconti-nuities located within the range of the barrier.
7. System as in Claim 5, characterized in that the generator disk has one or more magnetic regions distributed around its circumference and emitting pulses that switch off a magnetically sensitive scanning device, a Hall generator for example, as the disk rotates.
8. System as in one of Claims 5 through 7, character-ized in that the circumferential distance between the at least two signal-emitting marks (9 & 10) distributed around the circumference of the generator disk (7) is shorter in one direction of rotation than it is in the other.
9. System as in one of Claims 1, 2,3,5,6 or 7, character-ized in that the pulse generator (4) has two signal tracks to allow different signals to be detected as the disk rotates.
10. System as in Claim 6, character-ized in that the generator disk (7) has two slots (9 & 10) that extend along radially different circumferential tracks, each slot being associated with one light-barrier switch (8) and their switching distance along the circumference enclos-ing a different angle.
11. System as in one of Claims 1,2,3,5,6 or 7, character-ized in that a comparator (3) is connected to the output terminals of the position detector (2 & 4) and of the memory (6) and triggers power-supply controls (12) for the drive mechanism when the two output signals coincide.
12. System as in one of Claims 1,2,3,5,6 or 7, character-ized in that the synchronization signal from the reference-point indicator (5) always sets the position detector (2) to a prescribed reference point value, zero for example.
13. System as in one of Claims 1, 2,3,5,6 or 7, character-ized in that the synchronization signal from the reference-point indicator (5) sets the position detector (2) to a value prescribed by the output from the memory (6) that corresponds to the limiting position or to a stop position dictated by an adjustment and toward which the panel is traveling as it travels through the reference-point position such that, once that limiting position or stop position has been arrived at, the position detector will output a value that controls the drive-mechanism power-supply controls (12).
14. System as in one of Claims 1,2,3,5,6 or 7, character-ized in that an input-switch device (11) is provided for the limiting position of the memory (6) when the system is started for the first time and the panel is shifted by hand subject to monitoring by the human senses into each limiting position and if necessary into one or more stop positions, whereby, once the panel has been shifted into an intended position, the input-switch device allows a value that corresponds to that position to be entered by manually activating a switch into an address in the memory that is from that time on assigned to that position in accordance with a value output by the position detector (2).
15. System as in Claim 14, characterized in that the input-switch device (11), the memory (6), the counter (2), the position detector (2 & 4), and, if there is one, the comparator (3) operate by transmitting dual-coded parallel signals.
16. System as in one of Claims 3,5,6 or 7, characterized in that the bistable switch in the indicator has a Hall genera-tor and a switching device that is triggered by it.
17. System as in one of Claims 3,5,6 or 7, character-ized by a stationary but pivoting permanent magnet (16) that is polarized perpendicular to its axis (17) of rotation and that another permanent magnet in the form of a switching magnet (18) that follows the motion of the panel passes by, such that, as the panel travels through the reference-point position, the switching magnet magnetically forces the permanent magnet out of one pivoted limiting position into the other, and further characterized by a stabilizing magnet (20) in the form of a less powerful stationary magnet that magnetically retains the permanent magnet in whatever limiting position it is in and by a stationary magnetically activated switching device, a reed contact (19) for example, that is triggered by the permanent magnet when the latter is in one limiting position and is not triggered when it is in the other limiting position.
18. System as in one of Claims 1,2,3,5,6 or 7, character-ized in that the reference-point position is in the vicinity of where the panel is when the gate is closed, especially at one or more of the stop positions between that vicinity and the next adjacent stop position along the direction that the panel travels in as the gate is opened.
19. System as in one of Claims 1,2,3,5,6 or 7, character-ized in that reference-point indicator (5) has a switching component that travels along with the panel and a switched component that is mounted stationary on the frame of the gate.
20. System as in one of Claims 1,2,3,5,6 or 7, character-ized in that the reference-point indicator (5) is part of a panel-motion simulator that reproduces at a greatly reduced scale the motion of the panel along its path between the limiting positions and that has a switching component that depends on the distance traveled and passes a stationary switched component as the panel travels, due for example to a spindle that is mechanically coupled to the motorized drive mechanism, especially to the output shaft of a transmission downstream of a motor, and that drives along a straight line a spindle nut that the switching component (18) is mounted on and that passes a switched component (16, 19, &
20) mounted stationary on the drive-mechanism housing.
20) mounted stationary on the drive-mechanism housing.
21. System as in one of Claims 1, 2, 3, 5, 6 or 7, characterized by several reference-point indicators associated with several panel reference-point positions at different defined locations along the path of motion.
22. An arrangement for controlling a drive mechanism with a driving motor for moving a gate back and forth between two limiting position and selectively through at least one stop positions along a predetermined path, comprising:
switching means for determining when a predetermined limiting position or stop position is being approached and emitting signals to switch off operating power to said motor; at least one reference-point detector for generating a synchronization signal when said gate travels through a predetermined reference-point position between said limiting positions; memory means for accepting, storing, and emitting data of said limiting positions and data of said selectively at least one stop position; and a position detector for supplying a value representing every actual position travelled through by said gate, said position detector receiving a positional-value readjustment dependent on said synchronization signal, said position detector releasing an output signal for switching off the operating power to said motor dependent on the direction the reference-point position is travelled through according to the predetermined limiting position or the stop position of said gate along said direction and selectively determined by a related output from said memory means once said gate arrives at said reference-point position.
switching means for determining when a predetermined limiting position or stop position is being approached and emitting signals to switch off operating power to said motor; at least one reference-point detector for generating a synchronization signal when said gate travels through a predetermined reference-point position between said limiting positions; memory means for accepting, storing, and emitting data of said limiting positions and data of said selectively at least one stop position; and a position detector for supplying a value representing every actual position travelled through by said gate, said position detector receiving a positional-value readjustment dependent on said synchronization signal, said position detector releasing an output signal for switching off the operating power to said motor dependent on the direction the reference-point position is travelled through according to the predetermined limiting position or the stop position of said gate along said direction and selectively determined by a related output from said memory means once said gate arrives at said reference-point position.
23. An arrangement as defined in claim 22, wherein said reference-point detector, said memory means, and said position detector comprise digital switch means.
24. An arrangement as defined in claim 23, wherein said position detector has a pulse counter with a counting input terminal connected to a pulse generator deriving pulses from rotation of said drive mechanism.
25. An arrangement as defined in claim 24, wherein said pulse generator has a generator disk, said motor having a drive shaft connected to said generator disk, said generator disk rotating with said drive shaft; said pulse generator further comprising a scanning means operatively connected with said generator disk, said scanning means having a physical informational state altered digitally at least once for every revolution of said generator disk.
26. An arrangement as defined in claim 25, wherein said generator disk is perforated, said scanning means having a light barrier, said generator disk having a circumference located within range of said barrier.
27. An arrangement as defined in claim 26, wherein said generator disk has two slots extending radially along different circumferential tracks, each slot having a respective light barrier switch, each slot having a switching distance along the respective circumferential track that encloses an angle different from the corresponding angle of the other slot.
28. An arrangement as defined in claim 25, wherein said generator disk has a circumference and at least one magnetic region around said circumference, said magnetic region emitting pulses for switching off a magnetically sensitive Hall generator as said generator disk rotates.
29. An arrangement as defined in claim 25, wherein said generator disk has a circumference and at least two signal-emitting marks distributed around said circumference, said two signal-emitting marks having a circumferential distance therebetween, said circumferential distance being shorter in one direction of rotation of said disk than in the other direction of rotation.
30. An arrangement as defined in claim 25, wherein said pulse generator has two signal tracks for allowing different signals to be detected as said generator disk rotates.
31. An arrangement as defined in claim 22, wherein said reference-point detector comprises a bistable switch and said memory means comprises non-volatile electrical means, so that depending on a switching state of said reference-point detector, said gate being shiftable out of a current position only toward said reference-point position when said drive mechanism is operative and a corresponding adjustment of said position detector is absent.
32. An arrangement as defined in claim 31, wherein said bistable switch has a Hall generator and switching means triggered by said Hall generator.
33. An arrangement as defined in claim 22, further including power supply control means connected to said driving motor; comparator means connected to an output of said position detector and an output of said memory means for triggering said power supply control means when the output of said position detector coincides with the output of said memory means.
34. An arrangement as defined in claim 22, wherein said synchronization signal always sets said position detector to a predetermined reference-point value.
35. An arrangement as defined in claim 22, wherein said synchronization signal sets said position detector to a value determined by an output of said memory means corresponding to the predetermined limiting position or the stop position said gate travelling to said limiting position or said stop position when travelling through said reference-point position, so that said position detector will emit the output signal for controlling the operating power of said motor when said predetermined limiting position said stop position has been arrived at.
36. An arrangement as defined in claim 22, including input-switch means or providing a limiting position value to said memory means when said arrangement is started initially and said gate is shifted by hand and monitored by human senses into each limiting position and said selectively at least one stop position, said input switch means allowing a value corresponding to an intended position to which said gate has been shifted to be entered manually by activating a switch into an address in said memory means, said value being assigned from thereon to said intended position in accordance with an output of said position detector.
37. An arrangement as defined in claim 36, wherein said input-switch means, said memory means, and said position detector transmit dual-coded parallel signals.
38. An arrangement as defined in claim 22, wherein said reference-point position is in vicinity of a predetermined location when said gate is closed; said predetermined location being at least one stop position and one adjacent stop position along a direction that said gate travels when said gate is opened.
39. An arrangement as defined in claim 22, wherein said reference-point detector has switching means travelling along with said gate and stationary switching-means mounted on a frame of said gate.
40. An arrangement as defined in claim 22, including a motion simulator having said reference-point detector as a part thereof and having a movable panel; said simulator reproducing at a substantially reduced scale the motion of said panel along a path between limiting positions; said simulator having switching means depending on distance travelling and passing a stationary switch as said panel travels; transmission means connected between said driving motor and said panel; spindle means connected to an output shaft of said transmission means; a spindle nut driven along a straight line by said spindle means and mounting said switching means depending on distance travelled and passing said stationary switch.
41. An arrangement as defined in claim 22, including additional reference-point detectors associated with a plurality of reference-point positions at different defined locations along the path of motion of said gate.
42. An arrangement for controlling a drive mechanism with a driving motor for moving a gate back and forth between two limiting positions and selectively through at least one stop position along a predetermined path, comprising:
switching means for determining when a predetermined limiting position or stop position is being approached and emitting signals to switch off operating power to said motor; at least one reference-point detector for generating a synchronization signal when said gate travels through a predetermined reference-point position between said limiting positions; memory means for accepting, storing, and emitting data of said limiting positions and data of said selectively at least one stop position; and a position detector for supplying a value representing every actual position travelled through by said gate said position detector receiving a positional-value readjustment dependent on said synchronization signal, said position detector releasing an output signal for switching off the operating power to said motor dependent on the direction the reference-point position is travelled through according to the predetermined limiting position or the stop position of said gate along said direction and selectively determining by a related output from said memory means once said gate arrives at said reference-point position; said reference-point detector comprising a bistable switch and said memory means comprising non-volatile electrical means, so that depending on a switch state of said reference-point detector, said gate being shiftable out of a current position only toward said reference-point position when said drive mechanism is operative and a corresponding adjustment of said position detector is absent; a pivoting permanent magnet with a stationary pivot polarized perpendicular to an axis of rotation of said pivot; a switching magnet comprising a further permanent magnet and following the motion of said gate, so that as said gate travels through said reference-point position, said switching magnet forcing magnetically said pivoting permanent moving out of one pivoted limiting position and into another pivoted position; a stationary stabilizing magnet retaining magnetically said pivoting permanent magnet in whatever limiting position occupied by said pivoting magnet with reduced magnetic strength;
stationary magnetically activated switching means with a reed contract triggered by said pivoting magnet when said pivoting magnet is in one limiting position, said magnetically activated switching means being not triggered when said pivoting magnet is in another limiting position.
switching means for determining when a predetermined limiting position or stop position is being approached and emitting signals to switch off operating power to said motor; at least one reference-point detector for generating a synchronization signal when said gate travels through a predetermined reference-point position between said limiting positions; memory means for accepting, storing, and emitting data of said limiting positions and data of said selectively at least one stop position; and a position detector for supplying a value representing every actual position travelled through by said gate said position detector receiving a positional-value readjustment dependent on said synchronization signal, said position detector releasing an output signal for switching off the operating power to said motor dependent on the direction the reference-point position is travelled through according to the predetermined limiting position or the stop position of said gate along said direction and selectively determining by a related output from said memory means once said gate arrives at said reference-point position; said reference-point detector comprising a bistable switch and said memory means comprising non-volatile electrical means, so that depending on a switch state of said reference-point detector, said gate being shiftable out of a current position only toward said reference-point position when said drive mechanism is operative and a corresponding adjustment of said position detector is absent; a pivoting permanent magnet with a stationary pivot polarized perpendicular to an axis of rotation of said pivot; a switching magnet comprising a further permanent magnet and following the motion of said gate, so that as said gate travels through said reference-point position, said switching magnet forcing magnetically said pivoting permanent moving out of one pivoted limiting position and into another pivoted position; a stationary stabilizing magnet retaining magnetically said pivoting permanent magnet in whatever limiting position occupied by said pivoting magnet with reduced magnetic strength;
stationary magnetically activated switching means with a reed contract triggered by said pivoting magnet when said pivoting magnet is in one limiting position, said magnetically activated switching means being not triggered when said pivoting magnet is in another limiting position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 558792 CA1293312C (en) | 1987-02-12 | 1988-02-12 | Variable drive mechanism for the panel of a gate or similar structure |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3704417 | 1987-02-12 | ||
| DEG8800517.8 | 1988-01-18 | ||
| CA 558792 CA1293312C (en) | 1987-02-12 | 1988-02-12 | Variable drive mechanism for the panel of a gate or similar structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1293312C true CA1293312C (en) | 1991-12-17 |
Family
ID=4137444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 558792 Expired - Lifetime CA1293312C (en) | 1987-02-12 | 1988-02-12 | Variable drive mechanism for the panel of a gate or similar structure |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1293312C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106828935A (en) * | 2016-10-21 | 2017-06-13 | 北京京东尚科信息技术有限公司 | Fixture, unmanned delivery's instrument and the automatic method for delivering load |
-
1988
- 1988-02-12 CA CA 558792 patent/CA1293312C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106828935A (en) * | 2016-10-21 | 2017-06-13 | 北京京东尚科信息技术有限公司 | Fixture, unmanned delivery's instrument and the automatic method for delivering load |
| CN106828935B (en) * | 2016-10-21 | 2024-04-16 | 北京京东乾石科技有限公司 | Clamp, unmanned carrier and method for automatically throwing carrier |
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