DE1226313B - Device for length measurement of rolling stock passing through - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

GOIb

German KL: 42b-5

Number: 1226 313

File number: P 34842IX b / 42 b

Filing date; August 6, 1964

Opening day: October 6, 1966

The invention relates to a device for measuring the length of rolling stock passing through. It is one Length measuring device known in which the passing material rolls on a role and this roller controls a counter to count its revolutions. At the level of this role is a Sensor in the form of a light barrier is provided, which turns on the counter when it comes from the The front edge of the goods is interrupted, and which the counter switches off again when that the rear end of the goods releases the light barrier again. The number of revolutions of the roller between these times is a measure of the length of good that has passed the roll. These However, the arrangement has the disadvantage that it does not take into account the slip of the goods on the role. It is often difficult to position the feeler exactly in the plane of the roller.

A device for measuring the length of rolling stock passing through is also known, in which the rolling stock rolls on a roller and the roller controls a counter for counting its revolutions, in which the counter can be switched on and off by a first sensor actuated by the rolling stock and in which a second sensor is arranged in the path of the rolling stock behind the roller at a fixed distance from the first sensor, when it is actuated by the leading edge of the rolling stock, the counting pulses are transmitted from the counter to a memory, and in which when the first sensor is released the end of the rolling stock, the counting pulses contained in the counter are fed to a computer which converts the pulses into a length in relation to the number of pulses from the memory corresponding to the fixed distance. With this arrangement, first of all - regardless of slip and rolling stock elongation - the pulses are counted which are given while the rolling stock leading edge runs over the fixed known distance from the first sensor to the second sensor. This value is fed into a memory. Assuming that the distance between the n sensors Z, the number of pulses given on this distance η and the total number of pulses counted, which corresponds to the total length L of the rolling stock, is N , then you can use a suitable computer calculate the total length L of the counter and memory status

η
In this known arrangement must advance device for length measurement of
rolling stock passing through

Applicant-Marcel Charles Pfister,
Wolfisheim (district of Strasbourg) (France)
Representative:

Dr. F. Pommer, lawyer,
Düsseldorf, Heyestr. 52

Named as inventor:

Marcel Charles Pfister,

Wolfisheim (district of Strasbourg) (France)

sets that the slip between the roll and the rolling stock is constant over the entire length of the rolling stock is. However, this requirement can hardly be met, especially with larger material lengths do. For this reason, the known arrangement encounters difficulties in practice.

The invention is based on the object, using the basic concept outlined, a To create an arrangement for measuring the length of rolling stock, which also allows large lengths of rolling stock can be measured with relatively few errors, even if there is slippage between the roll and the rolling stock should change something over the length of the rolling stock. According to the invention this is achieved by that further sensors are arranged at fixed intervals behind said second sensor, each at their actuation by the leading edge of the rolling stock

a) send a counting pulse to a counter to display coarse length units,

b) the respective counter reading is transferred to the memory in such a way that the counter starts again begins to count and the memory one the last run through distance between two Sensor contains a corresponding number of pulses.

In the arrangement according to the invention, a direct coarse measurement of the Length due to the additional sensor. So-. as long as the first sensor detects rolling stock a counting pulse is generated every time the leading edge of the rolled material passes one of the additional sensors

609 669/189

give. Coarse length units are counted. The products delivered by the role "counts have hereby initially nothing to do, and the slip between the roller and rolling therefore still plays no role in this coarse measurement, the rough measurement is performed without error ^'■..;

The roll and the counting pulses generated with it are only used for »interpolation«, namely to determine the remaining piece, which no longer results in a full coarse length unit. This greatly reduces the percentage measurement error that could be caused by changes in slip. However, this interpolation is not based on a stored number of pulses resulting from the first. Away.-. "Cut of the rolled material resulted when it ran through the distance between the first .. and the second sensor. Rather, each time a coarse length unit is counted, the memory is fed anew with the pulse numbers that result from this length unit. Thus, in the interpolation, not only the slip that resulted at the tip of the rolling stock is taken into account, and this slip is assumed to be constant over the entire length of the rolling stock. Rather, the "interpolation" is based on the number of pulses and the slip that is located on the coarse length in,. revealed. It is evident that these values will apply with greater accuracy than values which were once obtained at the tip of the rolling stock. A very precise measurement of the length of the rolled stock is thus possible. . "
. An embodiment of the invention is shown schematically in the figure and described below:

1 with a roll stand is designated, through which rolling stock runs in a known manner. A pulse generator 3 is connected to a roll 2 of the stand and operates on a counter 5 via a gate 4. A first sensor 6 in the form of a light barrier or a photoelectric scanning device is arranged in the path of the rolling stock, which gives an output signal as soon as the rolling stock comes into the plane of the sensor 6. With 7, 8, 9, 10 and 11 further similarly constructed sensors or scanning devices are referred to, which are arranged behind the frame 1 at fixed intervals of, for example, b = 5 m. Each of the sensors 7 to 11 emits a pulse as soon as the leading edge of the rolling stock passes through its plane.

As soon as the sensor 6 is actuated by the rolling stock, it gives the count of the pulses via the gate 4 of the pulse generator 3 by the counter 5 free. If by the end of the rolling stock the Sensor 6 is released, the pulses from the counter are switched off.

Every time the leading edge of the rolling stock passes one of the sensors 7 to 11, then the counter reading of the counter 5 is transmitted once to a memory 13 via an OR gate 12 and the counter 5 is reset to zero. ' At the same time, a pulse is generated via a gate 14 a counter 15 is given, which is to display the measured length and counts there every time "5 m".

. The gates 4 and 14 are controlled by the sensor 6 and are open as long as the sensor 6 Rolled stock "sees". When the rear end of the rolling stock releases the sensor 6, then the counting is interrupted. There are none via gate 4 Counting pulses more from the pulse generator 3 to the counter 5, and the gate 14 separates the pulses from the sensors 7 to 11 from the counter 15.

The counter reading in counter 15 now corresponds exactly to the counted full coarse length units, ie in the present case the number of counted 5 m lengths. The counter reading in counter 5 is a measure of the remainder, which no longer results in a full coarse length unit. The status of the memory 13 indicates how many pulses of the generator 3 corresponded to the last, preceding coarse length unit. If Z is the status of counter 5, A is the status of memory 13, then calculate the remaining length ΔΙ-ζχί from

This calculation is carried out by means of a computer 16. When the signal at sensor 6 ceases to exist, the status Z of the counter and the status A of the memory 13 are transferred to the computer 16, the arithmetic operation is initiated and the result is added to the status of the counter 15.

Claims (1)

Claim: Device for length measurement of continuous Rolled stock, in which the rolled stock rolls on a roller and the roller is a counter to count their revolutions controls at which the counter by one of the Rolled stock actuated first sensor can be switched on and off and in which in the path of the Rolled material behind the roller at a fixed distance from the first sensor, a second sensor is arranged, when actuated by the rolling stock leading edge, the counting pulses from the Counter can be transferred to a memory, and which when the first sensor is released the counting pulses contained in the counter are fed to a computer through the end of the rolling stock which the pulses in relation to the number of pulses corresponding to the fixed distance converted from the memory into a length, characterized in that at fixed intervals after said second Sensor further sensors are arranged, each of which is actuated by the leading edge of the rolling stock a) give a counting pulse to a counter to display coarse length units. b) the respective counter reading is transferred to the memory in such a way that the counter of starts to count again and the memory changes to the last interval contains a corresponding number of pulses between two sensors. Considered publications:
German Patent No. 604 301;
German Auslegeschrift No. 1099183;
U.S. Patent Nos. 1998,950, 3,066,226. 1 sheet of drawings 609 669/189 9.66 ® Bundesdruckerei Berlin