Apparatus and method for dimensional weighing utilizing a laser scanner or sensor

• US 5,770,864 A
• Filed: 12/31/1996
• Issued: 06/23/1998
• Est. Priority Date: 12/31/1996
• Status: Expired due to Term

• Current Assignee: Pitney Bowes Incorporated (Böwe Systec AG)
• Original Assignee: Pitney Bowes Incorporated (Böwe Systec AG)
• Inventors: Dlugos, Daniel F.
• Primary Examiner(s): LE, QUE TAN
• Application Number:
  US08/775,850
• Time in Patent Office: 539 Days
• Field of Search: 250/559.19, 250/559.21, 250/559.22, 250/559.26, 356/72, 356/372, 356/379, 356/380, 356/383, 356/384, 356/387
• US Class Current: 250/559.19
• CPC Class Codes: G01B 11/00 Measuring arrangements characterised by the use of optical techniques
• CPC Class Codes: G01B 11/028 by measuring lateral position of a boundary of the object G01B11/022, G01B11/024, G01B11/04 take precedence
• CPC Class Codes: G01B 11/04 specially adapted for measuring length or width of objects while moving
• CPC Class Codes: G01G 19/005 with electric or electronic computing means

Abstract

The invention is a method and apparatus for measuring the dimensions of a parcel. The method comprises a series of steps utilizing the apparatus for determining each of the relevant dimensions of the parcel. The steps begin with the placing of a parcel on a flat surface in a field of measurement; the flat surface can be the weighing surface of a scale for calculating the parcel weight. A laser scanner is positioned and then rotated within its position so as to locate the lead and trail edges of the parcel, the left and right sides, and the top and bottom edges. The positioning data is then transmitted to a data processor which calculates the length, width, and height of the parcel. A conveyor belt for transporting the parcel to the measurement field can be utilized. A laser beam is transmitted toward a mirror so that the parcel must pass the mirror while the parcel is on the conveyor belt. The mirror is further positioned so that the laser beam is deflected toward an encoder bar located on the surface of the conveyor belt. During the transmission of the laser beam, a count is established which corresponds to a predetermined measurement scale. The count is continued until the transmission of the laser beam to the encoder bar is broken by passage of the parcel across the laser beam; the count continues when the beam is no longer blocked. The length and height of the parcel can then be determined.

Claims

1. A method of utilizing an emitter/scanner device for measuring the dimensions of a parcel for use in a parcel processing application of a data processing device, and comprising the steps of:

(a) placing a parcel on a flat surface in a field of measurement;

wherein said laser scanner/emitter is positioned either above or below said parcel; and

said laser scanner/emitter is further positioned behind said parcel;

(b) rotating said laser scanner/emitter so as to locate the lead and trail edges of said parcel;

(c) calculating a length of said parcel by calculating the distance from said lead edge to said trail edge;

(d) rotating said laser scanner/emitter so as to locate a left side and a right side of said parcel;

(e) calculating a width of said parcel by calculating the distance from said left side to said right side;

(f) rotating said laser scanner/emitter so as to locate a top edge and a bottom edge of said parcel; and

(g) calculating a height of said parcel by measuring the distance from said top edge to said bottom edge; and

(h) applying said length, said width, and said height of said parcel to a predetermined list of values in a data table so as to determine a shipment value for said parcel based upon said application.

2. The method of claim 1, wherein said flat surface is the weighing surface of a scale capable of calculating a weight of said placed parcel.

3. The method of claim 1, wherein said calculated length, width, and height are displayed on a display field or a monitor.

4. The method of claim 1, wherein said calculated length, width, and height are transmitted to said parcel processing system.

5. The method of claim 1, wherein said calculated weight is displayed on said display field or on said monitor.

6. The method of claim 2, wherein said calculated weight is transmitted to said parcel processing system.

7. The method of claim 6, wherein said calculated weight of said parcel is applied to a predetermined list of values in a data table so as to determine a shipment value for said parcel based upon said application.

8. An apparatus for measuring the dimensions of a parcel comprising:

(a) a supporting means for supporting a parcel placed thereupon for measurement;

(b) a laser scanner/emitter means for rotatably scanning a predetermined field for measurement data wherein said measurement data is representative of said parcel'"'"'s length, said parcel'"'"'s height, and/or said parcel'"'"'s width; and

, wherein;

(i) said laser scanner emitter means is located in a measured position from a predetermined point of said supporting means;

(ii) said laser scanner emitter emits a beam toward said supporting means along a baseline; and

(iii) said laser scanner/emitter means receives a reflection of said emitted beam and said received beam is used to determine said measurement data;

(c) calculator means for calculating said parcel'"'"'s length, said parcel'"'"'s height, and said parcel'"'"'s width from said measurement data;

(d) data processing means for;

(i) controlling rotational movement of said laser scanner means;

(ii) receiving and essentially simultaneously processing measurement data from said laser scanner/emitter means;

(iii) transmitting said measurement data to said calculator means to determine said actual measurements based on a pre-selected measurement scale;

(iv) receiving said actual measurements from said calculator means; and

(v) transmitting said actual measurements to a display means and/or to a parcel processing system; and

(e) determination means for determining a shipment cost for transporting said parcel to a destination as a function of said actual measurements as applied to a rate table.

9. The apparatus of claim 8 wherein said supporting means is the weighing surface of a scale capable of calculating a weight of said placed parcel.

10. The apparatus of claim 8, wherein said calculated length, width and height are displayed on a display means.

11. The apparatus of claim 8, wherein said calculated length, width and height are transmitted to a parcel processing system.

12. The apparatus of claim 8, wherein said calculated weight is displayed on said display means.

13. The apparatus of claim 8, wherein said calculated weight is transmitted to said parcel processing system.

14. The apparatus of claim 8, wherein said beam is directed along said baseline and wherein said direction is initiated at said pre-determined point of said supporting means.

15. The apparatus of claim 8, wherein said reflection of said beam is received and measured with respect to its relative signal strength and relative angle of emission to determine the length of the parcel along said baseline.

16. The apparatus of claim 8, wherein said relative signal strength is based upon a comparison of an expected signal strength to a received signal strength.

17. A method for measuring the dimensions of a parcel, comprising the steps of:

(a) placing a parcel onto a conveyor belt;

(b) moving said conveyor belt so that said parcel is transported into a field of measurement;

(c) transmitting a laser beam from a transmitter located directly above and along an axis of said conveyor belt movement toward a mirror wherein the positioning of said transmitter is predetermined;

said mirror located along said axis so that said parcel must pass said mirror while said parcel is placed on said conveyor belt;

said mirror further positioned at approximately a 45°

angle relative to said laser beam so that said laser beam is deflected downward at an angle of approximately 45°

onto said axis of said conveyor belt and toward an encoder bar located on the surface of said conveyor belt;

(d) reflecting said laser beam from said encoder bar to said mirror and from said mirror to a receiver co-located with said transmitter;

(e) establishing a count during said transmission of said laser beam wherein said count corresponds to at least one predetermined measurement scale;

(f) continuing said count until said transmission of said laser beam to said encoder bar is broken by passage of said parcel across said laser beam as said parcel passes said mirror;

(g) restarting said count when said parcel has passed said mirror and said transmission of said laser beam is no longer broken;

(h) determining a length and a height of said parcel by calculating a period of time that said laser beam transmission was broken relative to said count and when said laser beam transmission was not broken; and

(i) calculating an angle between said laser beam and said parcel at which said laser beam transmission was broken.

18. The method of claim 17, wherein said calculated length and height are displayed on a display or monitor.

19. The method of claim 17, wherein said calculated length and height are transmitted to a parcel processing system.