NL8105000A - METHOD FOR CHECKING THE SEPARATORY EFFECT AND ERRORS IN THE FEEDING OF LEAF MATERIAL. - Google Patents

Description

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Title: Method for checking the separating effect and faults in the supply of rough material.

The invention relates to a method of controlling the separation process and of fault sites and the supply of rough material.

It is known to use photoelectric probes or detectors to separate sheet-like material for further processing by means of machines, such as, for example, sorting machines or post-processing machines. Such photosensitive means are checked whether the paper transport takes place without interference, by checking whether only a sheet or sheet is present and supplied during a certain interval of time.

In order to check whether a sheet or sheet is present, use is normally made of a screening box which is switched on for a specific time interval via associated control means, for instance a cam switch. To check the resolution, the reduction of the light intensity of another screening box is measured. The switching threshold can be determined by means of a voltage divider. In the case of sheet-like material, which is printed with a high density, such a switching threshold can in most cases no longer be precisely set with the usual device.

The object of the invention is now to provide a method in which the latter objection is met and in which only one measuring device is required. This object is achieved according to the invention in that by means of a pair of probes both the control of the separating action or the fault site control are carried out, namely that the permeability or thickness of the leaf material is measured, the result being ana the lye-digital converter is converted and fed to a microprocessor for further processing, measuring the thickness of a sheet passing through the probes and storing it as a reference value for a subsequent sheet-like object in the microprocessor, the microprocessor being synchronizes the sampling cycles of the probes. According to further aspects of the invention, it is characterized in that photoelectric sensors are used as probes; 8105000 »1 Τ '2 r · tisciie probes are used to measure the thickness of a leaf-shaped object; for measuring the thickness of a sheet-shaped object capacitive probes are used; the parallel supply of sheet material can be checked before adding further probes; further items 5 can be checked by adding further probes; and a time signal generator coupled to a sheet material transport mechanism via the microprocessor allows the synchronization of multiple stations.

The invention will be explained in more detail below with reference to the drawing of a principle diagram.

The method for checking the separating action and for fault sites requires only a few probes 10 and 11, which performs both the separating action control and the error site checking. The probes 10 and 11 of the pair are coupled to an analog-to-digital converter 21 and to a microprocessor 22.

The microprocessor 22 thereby automatically adjusts the response sensitivity of probes 10 and 11 to the respective requirement. For example, with each change of the sheet material 30, the pair of probes 10 and 11 is adjusted to the thickness of the first sheet of a stack. This adjustment is possible at any printing density of the sheet material 30, because the damping, attenuation, or thickness change, respectively, when measured by the probes 10 and 11, is incorporated in its entirety into the processing during the transport of a sheet . This also makes it possible to control partial partial damping. Photoelectric sensors are used for probes 10 and 1 25 11. Capacitive or magnetic probes can also be used to measure the thickness of the sheet material 30.

Probes 10 and 11 are preferably operated by pulse-shaped signals, whereby a higher useful effect is obtained. The microprocessor 22, which controls the synchronization of the sampling cycles, is used as the time signal generator.

The described method can be easily extended by adding other pairs of probes, whereby no additional parts are required other than these probes. It is only necessary to store new 35 addresses in the microprocessor. Such extensions make it possible, for example, to check for unacceptable deviations in the prescribed parallel guidance of sheet material.

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By adding a time signal generator Ut coupled to a transport mechanism Uo for the sheet-shaped material 30, it is possible to synchronize multiple stations speed independent via the microprocessor.

8105000

Claims (6)

1. Method for checking the separating action and faults he places the tueyur of leaf material on the other working machines »characterized in that by means of a few probes (10, 11j both the checking of the separating effect, 5 as well as the check of the error sites is carried out, by measuring the permeability or thickness of the sheet material (30), the result being converted into an analog-digital converter (21) and to a microprocessor (22) for further processing the thickness of a sheet passing through the probes (10, 11) is measured and stored as reference value for a next sheet-like object (30) in the microprocessor (22); and the microprocessor (22) synchronizes the sampling cycles of the probes (10 ', 11)'. Method according to claim 1, characterized in that photoelectric sensors are used for the 15 sins (10, 11 '). Method according to claim 1, characterized in that magnetic probes (10, 11) are used to measure the thickness of the sheet material (30). k. Method according to claim 1, characterized in that capacitive probes (10, 11) are used for measuring the thickness of the sheet material (30). Method according to claim 1, characterized in that the parallel guidance of the sheet material (30) can be checked by adding further probes (10, 11). Method according to claim 1 or 5, characterized in that further stations can be checked by adding further probes (10, 11). Method according to claim 6, characterized in that a time-30 signal transmitter (Ui) coupled to the transport mechanism for the sheet material (30) enables the synchronization of several stations via the microprocessor (22). 8105000