EP1512824A2 - System for measuring the absolute position for an automatic revolving door - Google Patents

Abstract

The encoded absolute position measuring system is used for determining the position of a rotating doors having several door vanes or panels all held at the center of the door. A measuring system is provided for determining the absolute position of the door vanes. This measuring system comprises an encoder tape (5) and an optical scanning system arranged on or in the door vane(s). The optical system scans the tape. The measuring system also includes a decoder (7) which determines the absolute position of the door vane based on the signal output by the optical scanning system.

Description

The invention relates to an absolute position measuring system for a revolving door for determining a path position of running on a circumference Wing.

There are different drive systems for revolving doors, which are Electric motors above or below a turnstile with attached Wings are located.

There is also a revolving door according to DE 44 25 047 A1, in which motor drive a linear motor is used. It also can the individual wings are driven by separate linear motors. The linear motors are located above the door leaves and are ring-shaped arranged.

To the position of the individual wings in revolving doors, the z. In Escape and rescue routes are used to pinpoint, is it is necessary to have an accurate measuring system. At the market Revolving doors are used to position the wings Incremental encoder used. Such revolving doors, in escape and Rescue routes are used, have so-called "break out "- fittings that allow one or more wings from their fold out to normal intended position. Furthermore Such doors must be secured accordingly after business hours which, on the one hand, through a so-called night ending, the However, leads to higher manufacturing costs, can be realized, or the door leaves drive into a so-called x-position (in the case of four-leaf doors). This means that only one of the inner cabinets between two Wing is externally accessible. For this it is necessary to know the exact position this wing opposite the drum walls surrounding the wings to determine.

There are position measuring systems on the market, which are almost all after same principle work that turns inside of a sensor an encoder or bars scanned by a code tape and be converted to the position via a computing unit. This is in general, a path traveled by a zero point using one of the Sensor emitted number of pulses determined, causing the position from the zero point and the distance traveled, d. H. relative to that Zero point, can be determined. In this method, however, is disadvantageous that the number of pulses either non-volatile cached or the position is lost with a power failure, whereby the wing (s) for a new positioning only in the zero position, d. H. on or to, would have to be driven.

It is therefore an object of the present invention to provide a measuring system for revolving doors to determine a position of itself on a circumference to provide movable wings, in which the previously described Disadvantages do not occur.

This object is achieved by a measuring system with the in claim 1 solved characteristics.

The measuring system according to the invention is therefore with a in or on a rail extending on or on the circumference located Code band indicating an absolute position, in or on arranged on the wing (s) optical scanning system, which is the Code tape scans, and equipped with a decoder based on of a signal output by the optical scanning system is absolute Position of the wing (s) determined. This will be a special Flexibility created because each position of each wing determined at any time without having to do a zero point indexing or provide other mechanical aids in addition to the measuring system. This is achieved in particular by the fact that the code band is not only has dashes at a certain distance in the process the wing lead to emitted by the sensor pulses, but indicates an absolute position, even after a power outage directly can be read and evaluated. For the sake of clarity In the following description, only one wing is mentioned Understandably, revolving doors are always one Plurality of wings.

According to the invention, the decoder is preferably arranged in or on the wing. This to the alternative embodiment of the arrangement of Decoders in a stationary, z. B. in a control unit arranged Decoder has the advantage that the signals output from the sensor not for B. on the rail, along which moves the wing transferred but an evaluation of the on or in itself moving wings generated sensor signal directly on or in the wing can be done. Now only a transmission of the evaluated absolute position to a stationary control required, however because of the simpler signal relative to the sensor output signal can also be transmitted more easily.

The code tape is preferably made of a self-adhesive strip. As a result, the measuring system according to the invention in a particular easily installed or retrofitted to existing systems become. The optical scanning system can for this purpose preferably together attached to the wing with the decoder as a unit and over the wing be powered. The signals output by the decoder can then z. B. modulated on the power line or an additional Data rail to be transmitted to the stationary control and the otherwise difficult to assemble and adjust code strip can simply glued along the rail or on the rail become.

According to the invention, the code band preferably extends over the entire length of the rail. These are not just specific areas the rail, but the entire travel of the wings in terms of their absolute position detectable.

In a first embodiment of the invention, the code band contains continuous characters or character combinations. In this embodiment is also an absolute position indicated by the code band easily identifiable for people without additional resources. Further preferably the characters or character combinations repeat over the length of the code tape not, so that of the code tape one absolute position unique and without evaluation of multiple characters or Character combinations is displayed. This means that the characters or character combinations only once over the entire length of the Rail are available.

The measuring system according to the invention can be used as an optical scanning system Include CCD camera. In particular, this CCD camera can a in the first preferred embodiment described above the code band consecutive character combination easily detected and by a corresponding processing will be evaluated. Here it is z. B. Also conceivable that the code tape from a self-adhesive tape measure exists that evaluated via an image capture using the CCD camera becomes.

According to the invention, at least one code band is preferred Adjustment strip provided. By such an alignment strip can contiguous characters or character combinations provided on the code tape or other absolute position indicating elements more easily be identified because their relative position to the alignment strip is known.

In a second preferred embodiment of the invention, the Code band on a binary code, the further preferably a Gray code is. The binary code is preferably dark stripes on a light background or non-reflective strips built on a reflective ground. An advantage of such a code is that per progressive position value z. B. only needs to change 1 bit and that such a code in the automated evaluation is generally easier and error-prone, as easily identifiable for people without further aids Characters or character combinations.

In this second embodiment of the invention, there is the binary code preferably from a bar of a certain point width, the farther is preferably arranged between two alignment strips.

Furthermore, the optical scanning system in this second invention Embodiment preferably a line sensor and more preferably an illumination source for illuminating the code band. As a result, an optical low-cost linear sensor can be used according to the invention be, for each recording z. B. with a vertical bar z. B. reads 100 pixels and passes this data to a processor, from which determines the position.

Further details, features and advantages of the invention will become apparent from the following description of a preferred embodiment based on the drawings.

Figur 1:

Eine Prinzipdarstellung des erfindungsgemäßen Messsystemes, welches in einen erfindungsgemäßen Flügel integriert ist und

Figur 2:

eine Prinzipdarstellung des erfindungsgemäßen Messsystemes, das einen Binärcode abtastet.

Show it:

FIG. 1:

A schematic diagram of the measuring system according to the invention, which is integrated in a wing according to the invention and

FIG. 2:

a schematic diagram of the measuring system according to the invention, which scans a binary code.

An exemplary embodiment of a measuring system is shown in FIG. 1 played. For revolving doors of any type, be it conventional Drives or linear drives can be described below Measuring system for the absolute measurement of the sash stands on one Circumference, on which the wings move, be applied. So It is also understandable that after a power outage the driven Wing over the turnstile do not need to perform a first learning trip, because due to the measuring system an absolute position of the wings at any time along the circumference can be determined.

FIG. 1 shows a schematic enlarged view of a measuring system. It is on or in a raceway (circumference) of the wings a code tape 5 arranged, which of the scanning system 6 on the wing is scanned. The scanning system 6 consists of an optical lens 6b and an optical sensor 6a and is for transmitting data 15 with a decoder 7 connected to the z. B. a signal processor for decoding the absolute position over hard-coded patterns or continuous ones Bar code can be. Further, the scanning system 6 receives a supply voltage 14 from a power supply / data exchange unit 10, disposed within the wing and with conductors 1, 2 is connected to these to those given by a control unit 8 Supply voltage 14 to be connected to the control unit 8 data 15 exchange. The decoder 7 receives its supply voltage 14 also from a power supply / data exchange unit 10. The trained here as a signal processor decoder 7th is connected to the controller 8 for the purpose of data exchange.

About the optical scanning system 6 is located on the running track Codeband 5 with the help of the decoder 7 decrypts and thus the each position of the wing clearly and determined at any time. The code tape 5 is preferably made of a self-adhesive Strip containing continuous characters, such as numbers and / or letters, and which is mounted along the entire length of the trajectory. The Character combinations are preferably not repeated. These signs be in a first embodiment during the process the wing, z. B. of the wing, about z. B. a CCD camera recorded, which can form the sensor 6a of the scanning optical system 6, and within of the digital signal processor forming the decoder 7, d. H. it is from the digital signal processor, the position of the grand piano certainly.

FIG. 2 shows an alternative embodiment of the code tape 5, for which can be used as a sensor 6a a linear sensor, which is a binary code 5b scans the formed position information of the code tape 5. Here, the lens 6b z. B. be a Plexiglas optics that the code image centered on the sensor surface and achieved a certain focus, even at fluctuating distance of at least the sensor 6a and 6b carrying the reading head to the code tape 5 an exact Evaluation of the data allows. Such a plastic optics can z. B. be clipped onto the linear sensor 6a. Next is in this in Figure 2 shown embodiment, the decoder 7 directly with the as a linear sensor trained sensor 6a connected.

The second preferred embodiment according to the invention shown in FIG is with respect to the first embodiment described above, which contains a CCD camera, cheaper, since a usable here optical low-cost linear sensor, z. As per recording, a vertical Beam with z. B. 100 pixels read and these data serially to a Decoder 7 acting processor can pass, from which the position determined.

The code band 5 consists of a binary code, the z. With black Strip is constructed on a white background. As a relatively fault tolerant thereby the Gray code proved, in which pro progressive Value changes only 1 bit.

The code band 5 is preferably connected by means of a pair (not shown). Illuminated IR diodes, so anytime a defined amount of light on the Sensor is reflected. On both sides of the code, eg. B. under and above the code, alignment strips 5a are applied, the width and Distance allows accurate location of each bit.

The read-in data words are reduced to their minimum values from both sides examined to find the alignment strip 5a. This will at the same time the distance of the alignment strip 5a as a read pixel value and the remaining pixels detected can be determined by the number of bits used for encoding are shared, one at a time Determine bit associated pixels. The bit pixels become the two or four middle weighted and decrypts the corresponding bit from it.

The position word is z. B. via a data rail or z. B. modulated transmitted on the conductors 1, 2 to the controller 8.

LIST OF REFERENCE NUMBERS

1

conductor

2

conductor

5

code strip

5a

Justierstreifen

5b

Binary code on the code band 5

6

scanning

6a

Sensor of the scanning system

6b

Lens of the scanning system

7

decoder

8th

control

10

Power supply / data exchange unit of a element

14

supply voltage

15

dates

Claims (14)

Coded absolute position measuring system for a revolving door, consisting essentially of a drive for circumferentially moving wings, the wings being held in the center of the revolving door, and a measuring system for detecting the position of the wings, characterized in that the measuring system a measuring system for determining the absolute position of the wing (s), the measuring system consisting essentially of a code band (5) and an optical scanning system (6) arranged on or in the wing, which scans the code band (5), and a decoder (7) which determines the absolute position of the vane (s) based on a signal output at the optical scanning system (6). Measuring system according to claim 1, characterized in that the decoder (7) is arranged in or on the wing. Measuring system according to one of the preceding claims, characterized in that the code tape (5) consists of a self-adhesive strip. Measuring system according to one of the preceding claims, characterized in that the code band (5) extends over the entire circumferential length (circular arc) which the wing (s) describe. Measuring system according to one of the preceding claims, characterized in that continuous codes or character combinations are contained on the code band (5). Measuring system according to claim 5, characterized in that the characters or character combinations do not repeat over the length of the code tape (5). Measuring system according to one of the preceding claims, characterized in that the optical scanning system (6) comprises a CCD camera. Measuring system according to one of the preceding claims, characterized in that on the code tape (5) at least one alignment strip is provided. Measuring system according to one of the preceding claims, characterized in that the code band (5) has a binary code, preferably a Gray code. Measuring system according to claim 9, characterized in that the binary code consists of a bar of a certain point width. Measuring system according to one of claims 9 or 10, characterized in that the optical scanning system (6) comprises a line sensor. Measuring system according to one of claims 9 to 11, characterized in that the optical scanning system (6) comprises at least one illumination source for illuminating the code band (5). Measuring system according to the preceding claims for a revolving door, which has at least one linear drive for the wings. Measuring system according to claims 1 to 12 for a revolving door, at a turnstile with wings driven by an electric motor becomes.

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