Claims
- 1. A system for controlling the amount of single face material in a storage area ahead of the double face operation including:
- means for providing a signal representative of the difference between single face drive speed and double face drive speed,
- means for sensing the amount of single face material moving into said storage area, means for sensing the amount of single face material leaving said storage area, comparison means connected to said sensing means for providing an output signal proportional to their difference,
- means for sensing the speed of material moving adjacent the storage area input and means for sensing the speed of material moving adjacent the storage area output, means for comparing said storage area input and output material speeds, and means for applying the comparison from said storage area input and output speeds to said material comparison means,
- speed control means for automatically increasing or decreasing the speed of said single face drive to maintain a predetermined level of single face material in said storage area, said signal representative of the speed difference and said material comparison proportional output signal being connected to said speed control means and providing the input signals therefor.
- 2. The system of claim 1 further characterized in that said material sensing means includes pulse generating means for sensing the amount of single face material moving into the storage area and pulse generating means for sensing the amount of single face material leaving said storage area.
- 3. The system of claim 2 further characterized in that said pulse comparison means includes a counting circuit, with pulses from the pulse generating means sensing the single face material moving into the storage area causing said counting circuit to count in one direction and pulses from the pulse generating means sensing the single face material leaving said storage area causing said counter to count in the opposite direction.
- 4. The system of claim 3 further characterized by and including a digital-to-analog converter connected in said counting circuit, with the output of said converter being connected to said speed control means.
- 5. The system of claim 4 further characterized in that said speed control means includes an operational amplifier, said digital-to-analog converter being connected to said operational amplifier and providing one input therefor.
- 6. The system of claim 5 further characterized in that said speed sensing means includes tachometers, each of which are connected to said operational amplifier.
- 7. The system of claim 1 further characterized by and including tolerance means connected to said applying means and material comparison means, said applying means only applying the comparison from said storage area input and output material speeds when the comparison exceeds the setting of said tolerance means.
- 8. The system of claim 1 further characterized in that said storage area comparison means includes a counting circuit, a tolerance gate connected to said counting circuit and to the means for applying said comparison.
- 9. The system of claim 8 further characterized in that said material movement comparison means includes a counting circuit, said applying means includes pulse generating means connected to said material movement comparison means and controlled by said tolerance gate.
- 10. The system of claim 9 further characterized in that said last-named pulse generating means is programmed to provide the same predetermined count to said pulse comparison means as is the count level of said tolerance gate.
- 11. The system of claim 1 further characterized by and including counting means for sensing the amount of material passing into said storage area in a given period of time.
- 12. The system of claim 11 further characterized by and including means for applying liquid to an area of said single face material as it enters the storage area, and means for detecting the location of said wetted area adjacent the output of said storage area.
- 13. The system of claim 12 further characterized by and including means for starting said counting means at the application of liquid to said single face material and means for stopping said counting means at the detection of the wetted single face material.
- 14. The system of claim 1 further characterized by and including means for disabling said material comparison means for a predetermined period.
- 15. The system of claim 1 further characterized in that the means for sensing the amount of single face material moving into said storage area and the means for sensing the amount of single face material leaving said storage area provide the signals utilized in said means for providing a signal representative of the difference between single face drive speed and double face drive speed.
- 16. A method of controlling the amount of single face material in a storage area ahead of the double face operation including the steps of:
- sensing the difference between single face drive speed and double face drive speed and providing a signal proportional to that difference,
- sensing the amount of single face material moving into the storage area and sensing the amount of single face material leaving the storage area and providing a signal proportional to their difference,
- measuring the speed of single face material adjacent the input to the storage area and measuring the speed of single face material adjacent the output of the storage area, comparing said speeds and applying the resultant comparison to the signal proportional to the difference between material entering and leaving the storage area,
- and using the signal proportional to the difference in single face and double face drive speeds and the material proportional signal to automatically increase or decrease the speed of the single face drive to maintain a predetermined level of single face material in the storage area.
- 17. The method of claim 16 further characterized by the steps of applying said storage area speed comparison against a predetermined level, and adjusting said single face drive whenever said predetermined level is exceeded a given number of times.
- 18. The method of claim 16 further characterized by and including the step of periodically measuring the amount of material within the storage area.
- 19. The method of claim 18 further characterized in that said measuring step includes the step of applying liquid to said single face as it enters the storage area and subsequently detecting the wetted area.
SUMMARY OF THE INVENTION
This application is a continuation-in-part of copending application Ser. No. 445,579 filed Feb. 25, 1974, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3411388 |
Rappaport |
Nov 1968 |
|
3539085 |
Anderson et al. |
Nov 1970 |
|
3552308 |
Minehart |
Jan 1971 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
445579 |
Feb 1974 |
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