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Operation of The Exemplary Embodiment

Before using the computer system, the test input signal source at 64 may be used for purposes of determining whether the computer is in good calibration. In one embodiment, the application of test signal 64. by closing contact switch 66. resulted in a thousand counts on the counter 74 and the counter 22. If this result obtains, within a predetermined degree of accuracy, this indicates that the computer system is sufficiently accurate to be relied upon for the day's operation. Contact pair 62 would then be closed and 66 opened.

At various times during the working day, the mill operator is required to change the mill speed and/or deceleration time, this may be because a slowdown or a speed-up is necessitated by what is taking place elsewhere in the mill. The mill usually has some maximum speed dictated by various parameters, and this is equated to an analog voltage. For example, assume that 5 volts is equated to a maximum mill speed of 1560 inches per second. This voltage is applied to the isolation amplifier 24 and to a filter circuit 26. The mill operator, before attempting to use the stopping length calculator, makes a determination as to how fast he would like to stop the mill. This determina­tion is effected by the rheostat arrangement of the attenuation network 28, and is accomplished by the turning of manual dials which cause the selected contact pair to close such as: 50 or 52 or 54 or 56 or 58. Having determined the time in which the mill is to be stopped, the appropriate contacts are then closed. Assume for example, that the mill is running at max­imum (peed, of 1560 inches per sec., and that the contacts 50 are closed to realize a deceleration time of 90 seconds. This means that there is no attenuation of the mill signal input and the voltage comparator means 68 now sees +5 volts.

The free running oscillator generates and sends train of pulses through the gate 72. At the time of the closing of the contact pair 50, the gate means 72 and 20 are enabled by a signal on enabling input line 78. The roll 14 running along the moving strip, develops a train of clock pulses which are applied through the gate means 20 and the stopping length counter 22 begins to count upward. At the same time, the clock pulses passed by the gate means 72 are applied to the counter 74, and it begins to count upward. The counts of the counter 74, applied to the digital to analog converter 76, are developed as an increasing analog or ramp signal on the input line 84, in small incremental steps of perhaps 5 millivolts per increment. The ramp voltage signal builds up toward the 5 volts applied to line 60. During the interim or buildup period. the output of the voltage comparator is a binary ZERO, and the output of the inverter 86 is a binary ONE which, in the present embodiment, is a potential of +5 volts. The +5 volts are applied through inhibit input lines 80 and 88 to the respec­tive gates 72 and 20, enabling the gates to pass pulses to the respective counter 74 and 22. The counters then are counting up in synchronization. Finally, the potential on the line 84 is equal to +5 volts, and when it goes slightly beyond this magnitude, the voltage comparator experiences a change in output, and in this particular embodiment goes from a ZERO to some slight positive voltage in the order of +3.2 volts. This then is changed by the inverter to a binary ZERO which is sub­stantially equal to 0 volts. Zero volts on the lines 80 and 88 acts as an inhibitor signal to the gates 72 and 20 respectively, and the gates are now blocked - no further pulses reach the counters 74 and 22. We have thus measured with the roll 14 the length of strip that is required for the voltage to build up from 0 volts to 5 volts. In the illustrated example just described, this would be a stopping length equal to 900 feet with I volt input to the voltage comparator 68 equal to 1 80 feet (FIG. 3 Case A). The stopping length display means 90 then indicates the number of feet (i.e. 900) required to stop the mill in 90 seconds at a velocity of 5 volts=1560 inches per second. The number of counts counted by the stopping length counter 22 may be applied to the display device 90 which will equate the pulse count into a corresponding linear representa­tion for display on the device 90, or the digitized output may be derived from the counter 22 for direct application el­sewhere as a stopping length (S.L.) signal.



The system also has applicability for determining other slowdown requirements. For example, as shown in tabular form in FIG. 3, if it should be desired to slow down in 45 seconds, the mill operator would reset counters 22, 74 and then manually close the contact pair 54 by means of a manual dial setting. An enabling signal is then applied to gates 72 and 20 at 78. The same procedure would then take place, and counter 22 would build up a number of counts until the digital. to analog converter 76 built up a voltage equal to the attenuated voltage dialed into the attenuation network 28 by the mill operator. As shown in FIG. 3, at the same mill speed, deceleration in 45 sees, would require 450 feet (Case C), while at half mill speed only 225 feet would be required (Case D).

It will therefore be apparent that there has been disclosed a computer system for calculating stopping lengths in a mill operating over wide ranges of both mill speed and deceleration time requirements.

What we claim is:

1.Computer system for determining the stop length required to arrest a moving strip of material in a predetermined deceleration time, the material being payed out from a reel in a mill operating at a selectable mill speed, comprising:

a. means for providing an analog signal which is a function of said mill speed and said deceleration time;

b. means for providing a ramp signal;

c. means, synchronized in time with said ramp signal means, for generating a train of pulse signals as a function of the payed out length of said strip material;

d. means for comparing said analog and ramp signals and developing an inhibit signal when the analog and ramp signals are equal in magnitude; and

e. means for counting said train of pulse signals, adapted to receive said inhibit signal to stop further counting, the number of pulses counted up to the time of receipt of said inhibit signal being a function of the required stop length.

2. Computer system for determining the stop length required to arrest a moving strip of material in a predetermined deceleration time, the material being payed out from a reel in a mill operating at a selectable mill speed, comprising:

a. means for providing an electrical signal which is a function of said mill speed;

b. means adapted to receive said electrical signal and provide an analog signal which is a function of both said milt speed and said deceleration time;

c. means for providing a ramp signal;

d. means, synchronized in time with said ramp signal means, for generating a train of pulse signals as a function of the payed out length of said strip material;

e. means for comparing said analog and ramp signals and developing an inhibit signal when the analog and ramp signals are equal in magnitude; and

means for counting said train of pulse signals, adapted to receive said inhibit signal to stop further counting, the number of pulses counted up to the time of receipt of said inhibit signal being a function of the required stop length.

3. Computer system for determining the stop length required to arrest a moving strip of material in a predeter­mined deceleration time, the material being payed out from a reel in a mill operating at 8 selectable mill speed, comprising:

a. means for providing an analog signal which is a function of said mill speed and said deceleration time;

b. means for generating a first train of pulse signals;

c. means for receiving said first train of pulse signals for converting said first train of pulse signals to a ramp signal;

d. means, synchronized in time with said ramp signal means, for generating a second train of pulse signals as a function of the payed out length of said strip material;

e. means for comparing said analog and ramp signals and developing an inhibit signal when the analog and ramp signals are equal in magnitude; and

f. means for counting said second train of pulse signals, adapted to receive said inhibit signal to stop further counting, the number of pulses counted up to the time of receipt ofsaid inhibit signal being a function of the requiredstop length.

4. Computer system for determining the stop length required to arrest a moving strip of material in a predetermined deceleration time, the material being payed out from a reel in a mill operating at a selectable mill speed, composing:

a. means for providing an analog signal which is a function of said mill speed and said deceleration time;

b. means forproviding a ramp signal;

c. means for generating a train of pulse signals as a function of the payed out length of said moving strip;

d. means for comparing said analog and ramp signals and developing an inhibit signal when the analog and ramp signals are equal in magnitude; and

e. means for counting said train of pulse signals;

f. means for gating, adapted to receive said inhibit signal and said train of pulse signals, interposed between said generating means and said counting means, the gating means delivering laid train of pulse signals to said counting means in time synchronization with said ramp signal means, the gating means being disabled by the receipt of said inhibit signal, whereby the number of pulses counted by the counting means up to the time said gating means is disabled, is a function of the required stop length.

5. Computer system for determining the stop length required to arrest a moving strip of material in a predeter­mined deceleration time, the material being payed out from a reel in a mill operated at a selectable mill speed, comprising:

a. means for providing an electrical signal which is a function of said mill speed;

b. means adapted to receive said electrical signal and modify it to provide an analog signal which is a function of both said mill speed and said deceleration time;

c. means for generating a first train of pulse signals;

b. means for receiving said first train of pulse signals for conversion to a ramp signal;

c. means, synchronized in time with said ramp signal means, for generating a second train of pulse signals as a function of the payed out length of said strip material;

f. means for comparing said analog and ramp signals and developing an inhibit signal when the analog and ramp signals are equal in magnitude;

g. means for counting said second train of pulse signals;

h. means for gating, adapted to receive said inhibit signal and said second train of pulse signals, said gating means being interposed between said second train pulse generating means and said 'counting means, the gating means
delivering said train of pulse signals to said counting means in time synchronization with said ramp signal means, the gating means being disabled by the receipt of said inhibit signal; whereby the number of pulses counted by the counting means, up to the time said gating means is
disabled, is a function of the required stopping length.

KEYS

UNIT ONE

 

Ex. 9


1- D

2- F

3- E

4- A

5- C

6- B

 

7- L

8 - K

9 - G

10 - H

11 - J

12 - I


Ex.11.


1- n

2- g

3- p

4- q

5- y

6- v

7- e

8- z

9- r

10- s

11- b

12- d

13- a

14- f

15- m

16- o

17- t

18- i

19- c

20- u

21- j

22- x

23- l

24- h

25- k

26- w


Ex. 13


Date: 2015-12-18; view: 612


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