Claims
- 1. A method for reducing the polygon effect that occurs during the course of reversing a chain, which can be used for a pedestrian conveyor system, comprising the step of:superimposing a different rotational speed upon the rotational speed of a reversing wheel about which the chain that is being reversed is guided via an electric drive, where said electric drive indirectly or directly acts upon said reversing wheel, wherein said electric drive is driven by at least one power supply unit in such a way that said electric drive rotates with a non-constant rotational speed (n), which substantially corresponds to a mathematical function of the chain and then acts upon said reversing wheel in an equalizing manner, and wherein at least one of the phase position of said reversing wheel and the velocity of the chain is respectively measured and this measured value is transmitted to and compared to stored values in a control unit, which is electrically connected to the at least one power supply unit thereby allowing the one power supply unit to be adjusted accordingly.
- 2. The method according to claim 1, wherein the chain is used in a pedestrian conveyor system and the pedestrian conveyor system is one of an escalator and moving walkway.
- 3. The method according to claim 1, wherein said electric drive is connected to a gear, and the reversing wheel is acted upon by the non-constant rotational speed (n) of said electric drive in combination with the gear.
- 4. The method according to claim 1, wherein the at least one power supply unit is a frequency converter.
- 5. The method according to claim 1, wherein the phase position of said reversing wheel and the velocity of the chain are measured and these measured values are transmitted to a control unit, which is electrically connected to the power supply unit.
- 6. A device for reducing the polygon effect that occurs during the course of reversing a chain, which can be used for a pedestrian conveyor system, said device comprising:a reversing wheel about which the chain that is being reversed is guided; an electric driving motor which indirectly or directly acts upon said reversing wheel; at least one power supply unit coupled to said electric driving motor so that said electric driving motor can be driven with a non-constant rotational speed; a control unit having stored values and at least one sensor for detecting and measuring the phase position of said reversing wheel, said at least one sensor transmitting a measured value of the phase position and comparing to the stored values of the control unit, thereby adjusting the at least one power supply unit accordingly.
- 7. The device according to claim 6 further comprising at least one additional sensor for detecting and measuring the rotational speed of the chain, said at least one additional sensor transmitting its measured values to the control unit, which cooperates with the power supply unit.
- 8. The device according to claim 6, wherein the chain is used in a pedestrian conveyor system and the pedestrian conveyor system is one of an escalator and moving walkway.
- 9. The device according to claim 6, wherein said electric drive is connected to a gear, and the reversing wheel is acted upon by the non-constant rotational speed (n) of said electric drive in combination with the gear.
- 10. The device according to claim 6, wherein the at least one power supply unit is a frequency converter.
Priority Claims (1)
Number |
Date |
Country |
Kind |
199 58 709 |
Dec 1999 |
DE |
|
Parent Case Info
This application is a continuation of PCT/BP0010631 filed on Oct. 28, 2000 in the European Patent Office, designating the United States, and claiming priority of German Application No. 199 58 709.4 filed Dec. 6, 1999. The disclosures of the foregoing applications and each and every U.S. and foreign patent and patent application mentioned herein is incorporated by reference.
US Referenced Citations (12)
Foreign Referenced Citations (4)
Number |
Date |
Country |
23 46 266 |
Mar 1975 |
DE |
100 20 787 |
Jan 2001 |
DE |
0711725 |
May 1996 |
EP |
2243430 |
Oct 1991 |
GB |
Non-Patent Literature Citations (1)
Entry |
Klepzig Fachberichte 79, (1971), H 8 M 198-H 8 M 200, pp. 437-439. |
Continuations (1)
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Number |
Date |
Country |
Parent |
PCT/EP00/10631 |
Oct 2000 |
US |
Child |
10/162750 |
|
US |