DE202004000851U1 - Motor driven door position sensor for garage doors has light box with sun and planet gear drive to synchronization hole disc - Google Patents

Abstract

A motor (B) driven door position sensor (A) has a light box with synchronized disc with hole and increment hole fixed to a central gear driven through sun and transparent planet gears.

Description

The invention relates to a sensor for exact detection of the position of the gate in a motorized driven gate, for example a moving with an electric motor Garage door.

It is known, for example, for an electric motor operated garage doors commercially available wiper motors to use.

But about the end positions of the moving garage doors - fully open or Completely closed - to be determined and at the same time receive information about the exact position of the gate to be able becomes a magnetic sensor on the shaft of the driving motor, a so-called Hall sensor is arranged, which one per revolution Pulse delivers, so that a certain per motor shaft revolution Way of the gate movement can be assigned. Such sensors however, must be a certain reference point can be assigned. If you press the Door operator or even in the event of a sudden Power failure occurs for piece to one Procrastination of this reference point.

Another well-known technical Solution exists in that a door drive with a fixed incremental encoder in Drive motor or on the output shaft of the drive motor is equipped. additionally a micro button or button is attached to the drive, which 1 × per door path via a Lever or cam triggered becomes. With this equipment the door operator can perform its task in a time-stable manner. Repeatability the button is usually 5 mm to 10 mm. Likes in many use cases this may be sufficient, but not satisfactory.

For the realization is a higher one Costs necessary.

The door operator can also be used a fixed incremental encoder in the drive motor or on the output shaft of the drive motor his. The path synchronization is carried out using complex software based on the typical force curve. This method is, however, unstable in time and too imprecise.

Another constructively relative simple solution consists of providing two limit switches for the "open" or "closed" door positions.

The installation of the switches is however complex.

The present invention lies hence the task, a device for detecting the position to create the gate in a motorized gate, which high accuracy for the acquisition and at the same time for the required Reliability excellent to create.

According to the invention, this object is according to the characterizing Features of claim 1 solved.

As one of the main advantages this solution according to the invention which is possible with the sensor exact distance measurement for all for the To name the necessary parameters.

Due to the integrated Synchronization sensor is a high repeatability of the door movement possible. The long-term stability is absolutely.

The sensor can be mechanically simple to be assembled. An adjustment is not necessary.

All necessary functions are in a common housing accommodated. The mechanical parts can be inexpensively Injection molding processes are made.

Advantageous further training and Embodiments of the invention are from the subclaims and from the principle described below with reference to the drawings embodiment seen.

Show it

1 : a perspective view of the door drive motor (B),

2 : an illustration of the sensor (A) in an exploded view.

The 1 shows a perspective view of the door drive motor B, on which the sensor A is mounted.

Sensor A is used for the exact detection of Door movement on the drive axis of the drive motor B of the door drive unit.

In 2 sensor A is to be shown in an exploded view.

In the housing made of plastic 12 which with a lid 1 is closed, the components of the complete sensor are inserted.

The complete sensor A is simply plugged onto the output shaft of the drive motor B so that the three mounting holes fit on the three mounting bars of the motor. The perforated disc 2 jammed on the output shaft of motor B.

The sensor 1 serves as a direct incremental encoder for detecting the rotational movement of the output shaft of the drive motor B.

Because the output shaft has a Sprocket and a drive chain mechanically rigid with the garage door leaf is connected, the path of the gate movement stands between the mechanical End positions proportional to the speed of the output shaft. In order to is the sensor A directly as a displacement sensor for the door movement including the Suitable detection of the end positions.

The incremental encoder consists of the light barrier 8th and 9 and the perforated disc 2 , which is firmly attached to the output axis.

The perforated disc 2 is provided with 60 holes, which are evenly distributed on the circumference, so that 120 increments per motor revolution are available for the trip counter. This enables the gate path to be recorded with an accuracy of approximately 1.3 mm.

In the event of a power failure or Reversal of the gate movement can lead to a shift or total route information is lost and thus mechanical displacement of the end positions at the gate.

For synchronization it is therefore imperative Reference encoder on the drive unit necessary. A microswitch is usual for this attached to the drive unit, the one attached to the drive chain Cam 1 × per complete Gate movement triggered is synchronized and thus the position measuring system of the door drive unit.

The necessary path synchronization in the sensor is from that of the light barrier 10 . 11 , the synchronous perforated disc 5 with a hole 6 , the increment hole 3 on the perforated disc 2 and the existing 2-stage epicyclic gear unit.

The 2-stage epicyclic gear driven by the door drive motor B is driven by a sun gear 4 , which is firmly attached to the underside of the perforated disc 2 is applied, as well as three loose planet gears 7 , a central gear 13 which is firmly in the bottom of the case 12 is introduced and a central gear 14 , which is firmly attached to the underside of the synchronous perforated disc 5 is appropriate, formed.

The gearbox has a total gear ratio of 1:50, ie the central wheel 5 with the hole 6 passes the light barrier once every 50 revolutions of the driven motor axis 10 . 11 , However, this is only triggered when the increment hole 3 the light barrier also passes.

In the interaction between the synchronous perforated disc equipped with the gearbox 5 with hole 6 and the perforated disc 2 with the incremental hole 3 is on the light barrier 10 . 11 issued an electrical signal for the electronic control. This signal is emitted, for example, once on a 7.70 m gate path for a distance of approximately 2.6 mm.

A

sensor complete

B

drive motor

1

cover

2

perforated disc

3

Inkrementalloch

4

sun gear

5

Synchronous perforated disc

6

hole

7

Planet gears

8th

Photoelectric barrier

9

Photoelectric barrier

10

Photoelectric barrier

11

Photoelectric barrier

12

casing

13

Central gear

14

Central gear

Claims (4)

Sensor for the exact detection of the position of a door in a motor-driven door, characterized in that the sensor consists of a light barrier ( 10 . 11 ), a synchronous perforated disc ( 5 ) with a hole ( 6 ), an increment hole ( 3 ) on a perforated disc ( 2 ) and a 2-fold epicyclic gear, which provides the necessary reduction for the synchronous perforated disc ( 2 ) ensures exists. Sensor according to claim 1, characterized in that the 2-stage epicyclic gear driven by the door drive motor (B) and accommodated in a common housing is driven by a sun gear ( 4 ), which is firmly attached to the underside of the perforated disc ( 2 ) is applied, as well as three loose planet gears ( 7 ), a central gear ( 13 ), which is firmly in the bottom of the housing ( 12 ) and a central gear ( 14 ), which is firmly attached to the underside of a synchronous perforated disc ( 5 ) is attached, is formed. Sensor according to claim 1 and 2, characterized in that the sensor (A) on the output axis of the drive motor (B) the door drive unit is arranged. Sensor according to claim 1 and 2, characterized in that the planet gears ( 7 ) are made of translucent material.