Floor selector for lift

Details Floor selector for lift Floor selector for lift

1985-03-11

1987-01-13

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

340 21, B66B 302

Patent

active

046353208

DESCRIPTION:

BRIEF SUMMARY
The present invention concerns a pulse floor selector for a lift, with a floor and location determining system based on counting pulses indicating the velocity of the lift, with the aid of electronics suited to the purpose.
It has become increasingly common in the course of development of digital techniques to determine the location of a lift by counting pulses supplied by a transmitter of one kind or another. The pulse counting processes can be classified by two main categories: sparse pulse floor selection, and dense pulse floor selection. Sparse pulse floor selection is based on stopping points existing in the lift shaft and on having the retardation starting points set in the shaft e.g. by means of sheet metal ramps. Switches detecting these ramps are moving along with the lift cage. The logics on the lift's control panel deduce from this information the forming of lift velocity and the floor data. A sparse pulse floor selector is particularly appropriate in connection with slow lifts. The dense pulse floor selector counts pulses all the time, based on some kind of transmitter. The lift shaft is thus measured with an accuracy of for instance one centimeter. It is particularly after the introduction of microprocessors that the dense pulse floor selector has turned out to be a convenient means for providing a floor selector. However, the dense pulse floor selector needs a transmitter in order to be operable. As a rule, this transmitter is a digital pulse-forming means which has been coupled with the motion of the lift.
By U.S. Pat. No. 4,150,734 has been patented an apparatus where in the location of the lift is calculated from the tachometer with the aid of a pulse generation during the deceleration run. A speed reference is formed from this information. In this design the forming of the actual floor-level information is not taken into consideration: this matter is assumed to be understood. It should be noted that a design operating according to this principle cannot in any way correct the errors accumulating in the deceleration distance data. This causes unsatisfactory operation of the apparatus. Therefore, the apparatus has in fact only been described in conjunction with a gearless lift, in which case the velocities are at the most 1,8 m/s and the deceleration distances 1,6 m. On deceleration runs longer than this, difficulties pile up. Express lifts operate with deceleration distances up to 18 m.
The invention presents a procedure by which the separate transmitter required in a dense pulse floor selector can be omitted and the above-mentioned drawbacks eliminated. In order to achieve the effect stated, the invention is characterized in that the said counting pulses required for floor section are formed from the tachometer generator with the aid of an analog/digital converter, and that the floor datum is corrected by the aid of information obtained from the lift shaft at the floor level.
The design solution of our invention saves the lift location datum all the time because application of a microprocessor affords an easy way to correct the floor level data at every floor level. This means that every 3 meters there is a point wher correction is made.
The invention is described in the following with the aid of an example, referring to the attached drawing, where in
FIG. 1 presents the pulse floor selection arrangement commonly known in the art.
FIG. 2 presents a pulse floor selector according to the invention.
Referring now to FIG. 1, the lift motor M therein depicted is controlled by the control panel KT by the aid of electrical control data OH. With the motor has been mechanically coupled a tachometer generator TG, which supplies the velocity datum NT which the control panel requires. To the motor has also been connedted a toothed wheel PP which delivers pulses by mediation of a pulse transmitter PA. The pulses go in the form of pulse data PT to the control panel KT.
FIG. 2 shows the pulse floor selector according to the present invention. When the lift is in motion, the control panel KT controls the

REFERENCES:
patent: 3773146 (1973-11-01), Dixon, Jr. et al.
patent: 4068741 (1978-01-01), Ficheux et al.
patent: 4150734 (1979-04-01), Ohira et al.
patent: 4387436 (1983-06-01), Katayama et al.

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