Method for improving the quality of products produced in the cigarette manufacturing process

• US 5,284,164 A
• Filed: 11/07/1991
• Issued: 02/08/1994
• Est. Priority Date: 11/07/1991
• Status: Expired due to Term

• Current Assignee: R J Reynolds Tobacco Company (R. J. Reynolds Tobacco)
• Original Assignee: Brown & Williamson Tobacco Corporation (British American Tobacco PLC)
• Inventors: Jewell, John N., Wysowski, Charles H., Stephens, Darrel R., Sinksen, Dennis L., Andrews, Evelyn M., Bricker, Gregory J., Collins, Ernest E.
• Primary Examiner(s): Millin, Vincent
• Assistant Examiner(s): Pierce, William M.
• Application Number:
  US07/789,235
• Time in Patent Office: 824 Days
• Field of Search: 131/280, 131/908, 131/910, 364/550, 364/552, 364/556, 493/4, 493/37
• US Class Current: 131/280
• CPC Class Codes: A24C 5/31 with special arrangements coming into operation during starting, slowing-down or breakdown of the machine, e.g. for diverting or breaking the continuous rod
• CPC Class Codes: A24C 5/34 Examining cigarettes or the rod, e.g. for regulating the feeding of tobacco; Removing defective cigarettes
• CPC Class Codes: G07C 3/14 Quality control systems
• CPC Class Codes: Y10S 131/908 Sensing unique characteristic or specific condition of finished product
• CPC Class Codes: Y10S 131/91 Sensing or detecting malfunction in cigar or cigarette maker

Abstract

The present invention comprises a method for improving the quality of products produced in a cigarette manufacturing process. Selected machine operating parameters for at least one machine are monitored, as well as the product being produced. Samples of the product being produced are automatically obtained and tested for quality parameters. Machine operators are notified when to manually test samples of the product for quality parameters. The machine operators can request a test of a quality parameter. The actual test measurements of the quality parameters for either the automatically obtained samples or the manually tested samples are compared against expected values and alarms are presented and the testing is resequenced when the measured quality parameters fail to meet the expected values. Also, employee solution procedures are presented to aid in problem resolution. The time periods and downtime reason when each machine is inoperative is recorded. A hierarchial set of machine operator video displays is produced. A master video display is presented to each machine operator. Also, displays are available for the machine supervisors showing information about all the machines he is supervising. Further, machines can be monitored by sets of tandem machines operating together.

Claims

1. A method for improving the quality of products produced in a cigarette manufacturing process by machines operating in tandem, which comprises the steps of:

a. retrieving from a database expected baseline values of product quality parameters and machine operating parameters for a product selected by an operator of at least one set of tandem machines from a plurality of supported products produced by said at least one set of tandem machines;

b. monitoring by a computer of selected data representing machine operating parameters of said at least one set of tandem machines to provide an historical footprint for each unique machine of said at least one set of tandem machines and storing said selected data in said database;

c. automatically directing the obtaining of samples at preselected time intervals of the products being produced by said at least one set of tandem machines on a sequential basis as directed by said computer;

d. automatically testing quality parameters of the product produced by said manufacturing process utilizing a plurality of sensing devices as directed by said computer to obtain data representing said quality parameters to provide said historical footprint for each unique machine of said at least one set of tandem machines and storing by said computer of said sensed values to said database;

e. evaluating in real time by said computer said stored data representing said machine operating parameters and said stored data representing said product quality parameters to determine if said parameters fall outside of said retrieved baseline values or if said parameters have fallen outside of said historical footprint of each unique machine and if so, enabling said computer to;

(i) notify the operator, in real time, of said at least one set of tandem machines of an error condition when said sensed values fall outside of said retrieved expected values,

(ii) recommend possible solutions to said operator of said at least one set of tandem machines for correcting the error condition,

(iii) resequence said testing of quality parameters whenever said data representing sensed values falls outside of said historical footprint of each unique machine;

f. tracking by said computer for said at least one set of tandem machines the time period and downtime reason when said at least one set of tandem machines is inoperative;

g. generating by said computer a hierarchial set of video displays to provide information to the operators of said at least one set of tandem machines; and

,

h. displaying a master video display to the operator of said at least one set of tandem machines, said display showing the operational status, the product being produced, estimated production of the machine operator'"'"'s machine and the other machine operating in tandem with it along with said quality parameters and said historical data generated by said computer means.

2. The method of claim 1, further comprising the step of:

notifying each machine operator of said at least one set of tandem machines through said master video display when it is time for the operator to manually test samples of the product for said product quality parameters.

3. The method of claim 1, further comprising the step of:

responding to a request by the operator of one machine of said at least one set of tandem machines to said computer to automatically test a requested product quality parameter for a product sample.

4. The method of claim 3, further comprising the step of responding to a request by the operator of one machine of said at least one set of tandem machines by said computer to manually test a requested quality parameter for a product sample, wherein said request may also be a manual test.

5. The method of claim 1, wherein the step of evaluating in real time by said computer said stored data representing said machine operating parameters and said stored data representing said product quality parameters includes computing statistical averages and standard deviations which are further utilized in determining when said sensed test measurements fall outside of said historical footprint of each unique machine which may cause said computing means to resequence tests for an increased frequency of testing or take other operative steps to inform the operator of said manufacturing machine of said change in said sensed test measurements.

6. The method of claim 1, further including the step of:

calculating derivative quality parameters which are derived from the data from a plurality of tests.

7. The method of claim 1, further comprising the step of:

displaying a master video display to a supervisor of said at least one set of tandem machines, said master video display showing for each machine in said at least one set of tandem machines and for the machines operating in tandem as a system, the operational status of said at least set of tandem machines, the product each machine of said at least one set of tandem machines is producing, and the estimated production of said at least one set of tandem machines.

8. The method of claim 7, further comprising the step of:

allowing the supervisor to retrieve additional video displays form the hierarchial set of video displays for said at least one set of tandem machines which also provides a comparison of said multiple manufacturing machines and a display of comparative measurements of said machine operating parameters and said product quality parameters for each of said unique machines.

9. The method of claim 1, further comprising the step of monitoring by said computer of various materials being used to produce the products produced by said machines operating in tandem.

10. The method of claim 9, wherein the step of monitoring by said computer o various materials being used to produce the products produced by said machines operating in tandem includes the use of at least one bar code reader which the operator uses to indicate the source materials for the current product by scanning a representative material bar code, said computer notifying the operator when a wrong material selection has been made.

11. The method of claim 1, further comprising the step of:

tracking for said at least one set of tandem machines the time period and alarm condition when the machine operating parameters for said at least one set of tandem machines fail to meet said expected baseline operating parameter values and when said machine operating parameters for said at least one set of tandem machines fall outside said historical footprint for each of said unique machine.

12. The method of claim 1, further comprising the step of:

tracking for said at least one set of tandem machines the time period when there is a production malfunction causing said at least one set of tandem machines to cease production.

13. The method of claim 1, further comprising the step of:

tracking for said at least one set of tandem machines the time period when the product quality test measurements for said at least one set of tandem machines fail to meet said expected baseline product quality values and when said product quality test measurements for said at least one set of tandem machines fall outside said historical footprint for each of said unique machine.

14. The method of claim 1, wherein the step of displaying a master video display to the operator of said at least one set of tandem machines, said display shows the operational status, the product being produced, and the estimated production of the machine operator'"'"'s machine and the other machine operating in tandem with it, said display further includes:

a. highlighting out of tolerance conditions;

b. showing the most important current alarm condition or downtime reason, if applicable; and

c. allowing each machine operator of said at least one set of tandem machines to touch appropriate points on the master display to retrieve additional video displays from the hierarchial set of video displays which will provide more specific information.

15. The method of claim 14, wherein the more specific information obtainable by allowing each machine operator of said at least one set of tandem machines to touch appropriate points on the master display to retrieve additional video displays from the hierarchial set of video displays which will provide more specific information further included in the step of displaying a master video display to each machine operator of said at least one set of tandem machines, said display showing the operational status, the product being produced, and the estimated production of the machine operator'"'"'s machine and the other machine operating in tandem with it includes:

a. the machine operating parameters for each product;

b. the materials which should be used for each product;

c. a summary of past alarm conditions;

d. a summary of each of the past quality parameters tested or derived;

e. a graphical summary of the past statistical average and standard deviation for each of the past quality parameters tested or derived;

f. a summary of the past downtime reasons; and

,

g. suggested employee solution procedures to correct problems or out of tolerance conditions.

16. The method of claim 1, wherein in the step of displaying a master video display to the operator of said at least one set of tandem machines, said display shows the operational status, the product being produced, and the estimated production of the machine operator'"'"'s machine and the other machine operating in tandem with it, said master video display for each machine being arranged differently such that the operator of each machine will prominently see what is displayed for his machine while also seeing what is displayed for the machine working in tandem with his machine.

17. The method of claim 1, wherein the step of evaluating in real time by said computer includes the tracking by product of all products produced on said at least one set of tandem machines.

18. The method of claim 1, wherein the product quality parameters tested are selected form the group consisting of filter rod circumference, filter pressure drop, filter wet weight and filter dry weight, cigarette weight, cigarette circumference, cigarette ventilation, cigarette pressure drop, and package seal pressure.