Method for dimensional weighing with optics

• US 5,734,476 A
• Filed: 12/31/1996
• Issued: 03/31/1998
• 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): Font, Frank G.
• Assistant Examiner(s): Ratliff, Reginald A.
• Application Number:
  US08/775,671
• Time in Patent Office: 455 Days
• Field of Search: 356/380, 356/386, 356/387, 356/385, 250/560
• US Class Current: 356/628
• CPC Class Codes: G01B 11/026 by measuring distance between sensor and object G01B11/0608 takes precedence
• 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 for use in a parcel processing application of a data processing device, wherein a parcel is placed in a predetermined position on a weighing scale with a platform having at least two raised sides for placing the parcel thereagainst. When the parcel is placed, beams from a first laser source and from a second laser source are transmitted onto the parcel at a first and second target spot wherein the target spots are a known distance from each other, and wherein the target spots are in a line parallel to the weighing scale. The beams are reflected back to a rotating mirror assembly and to a beam detector. The mirror assembly is located in a line parallel to one of the two laser beam sources and is rotated at a constant rate so as to focus on the first and second target spots. The angle of focus of the mirror assembly is determinative of the distance from the mirror assembly to the parcel surface. If the determined angle of focus does not allow the mirror assembly to properly focus on the target spots, then the assembly is adjusted under control of the data processing device by adjusting the angle of focus wherein the degree of adjustment is determinative of a change in distance between the mirror assembly and the parcel surface.

Claims

1. A method 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 in a predetermined position on a platform within a field of measurement;

(b) transmitting a first beam from a first laser source onto a surface of said parcel at first target spot;

(c) transmitting a second beam from a second laser source onto said parcel at a second target spot wherein said second target spot is a known distance from said first target spot and wherein said first target spot and said second target spot are in a line parallel to said platform;

(d) rotating a mirror assembly at a constant rate wherein said mirror assembly is focused on said first target spot and said second target spot;

(e) determining an angle of focus of said mirror assembly wherein said angle is determinative of a distance from said mirror assembly to said parcel surface;

(f) adjusting said angle of focus if said determined angle of focus does not allow said mirror assembly to focus on said first target spot and said second target spot, wherein the degree of adjustment is determinative of a change in distance between said mirror assembly and said parcel surface;

(f) reflecting said first beam and said second beam from said parcel surface to said mirror assembly;

(g) reflecting said first beam and said second beam from said mirror assembly to a detector under control of said data processing device;

(h) measuring a distance from said predetermined position of said parcel to said mirror assembly; and

(i) determining a length of said parcel as a function of said predetermined position, said angle of focus, and said length.

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

3. The method of claim 1, wherein said adjustment of said angle of focus is made to said mirror assembly under control of said data processing device.

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

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

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

7. The method of claim 1, wherein said calculated weight is transmitted to said parcel processing system.

8. An apparatus for measuring the dimensions of a parcel for use in a parcel processing application of a data processing device and comprising:

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

wherein said supporting means has a plurality of raised sides wherein two of said raised sides meet at right angles for placing said parcel thereagainst as a registration point;

(b) first laser beam transmitting means for transmitting a first beam against a surface of said placed parcel and onto a first target point;

(c) second laser beam transmitting means for transmitting a second beam against said surface of said placed parcel and onto a second target point and wherein said first target point and said second target point are in a line parallel to said supporting means;

(d) rotating mirror means for focusing on said first target point and on said second target point;

(e) detecting means for detecting a change in angle between said rotating mirror means and each of said first and said second target points; and

(f) data processing means for;

(i) controlling said first and said second laser beam transmitting means;

(ii) controlling said rotation of, and an angle of adjustment of, said rotating mirror means;

(iii) controlling said detector means;

(iv) receiving and essentially simultaneously processing measurement data from said detecting means;

(v) transmitting said measurement data from said detecting means to calculator means to determine actual measurements based on a preselected measurement scale;

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

(vii) transmitting, said actual measurements to a display means and/or to a parcel processing application resident in said data processing device.

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 weight is converted to a signal capable of being received and processed by said data processing means.