FR2502131A1 - METHOD FOR CONTROLLING THE SEPARATION OF SINGLE LEAF SHEETS AND DETECTING GAPS IN THE INSULATED SHEET FEEDING OF MACHINES INTENDED TO ENSURE TREATMENT - Google Patents

Abstract

PROCESS FOR CHECKING THE SEPARATION OF SHEETS INTO INSULATED SHEETS AND DETECTION OF GAPS IN THE SUPPLY OF INSULATED SHEETS TO MACHINES INTENDED TO ENSURE THE TREATMENT. TO CONTROL THE SEPARATION OF SHEETS INTO INSULATED SHEETS AND TO DETECT THE GAPS IN THE SHEET FEEDING OF MACHINES INTENDED TO ENSURE THE PROCESSING, A PAIR OF SENSORS 10, 11 ARE USED, THE ANALOGUE MEASUREMENT VALUES OF WHICH ARE CONVERTED TO DIGITAL VALUES OF THEIR OPERATION IN A MICRO-PROCESSOR 22. THE MICRO-PROCESSOR AUTOMATICALLY CONTROLS THE SENSOR RESPONSE SENSITIVITY. APPLICATION: FOR EXAMPLE SORTING SUPPORTING DOCUMENTS AND POSTAL OPERATIONS.

Description

"Process for controlling the separation of leaves into isolated leaves and

  detection of deficiencies in the diet

  insulated sheets of machinery for the purpose of

  The present invention relates to a method of controlling the separation of leaves into isolated sheets and the detection of gaps in the supply of isolated sheets of machines.

  intended to deal with it.

  To control the separation of leaves into iso-

  intended for further processing by machines, such as

  for example, the sorting of supporting documents or the

  postal services, it is known to use

  electric. Such light barriers make it possible to

  ensure the regular transport of paper for the control of

  presence and the bringing of a sheet and only one to the

  China for a specified period of time.

  To control the presence of a leaf, it is usual to use

  a transparency light barrier, which is

  for a certain period of time

  intermediary of appropriate control means, for example

  - cam switches. To control the separation of

  isolated leaves, we measure the decrease in intensi-

  light of another light barrier by transparent

  this. The switching threshold must then be set by

  a potentiometer. When the leaves present

  a high density of printing, the current devices do not allow

  however, usually put more than fine tuning

a switching threshold.

  The subject of the present invention is a method which makes it possible to avoid this last drawback while requiring only one

only measuring device.

  The present invention solves this problem by the fact that a pair of sensors ensures both the control

  separation of leaves into isolated leaves and the

  control of the gaps in the supply of insulated

  by measuring the permeability or thickness of the

  sheets, by converting the result obtained into a conversion

  analogue-digital system, and by introducing the result

  in a micro-processor for its exploitation, that the

  The thickness of the sheet passing between the sensors is measured

  memory and stored in the microprocessor as a reference value for the next sheet, and that the microprocessor controls the synchronization of read rates

sensors.

  According to another characteristic of the method proposed by the present invention, the sensors used are sensors

Photoelectric.

  According to another characteristic of the method proposed by the present invention, the measurements of the thickness of the sheets

  are provided by magnetic or capacitive sensors.

  According to another characteristic of the method proposed by the present invention, the parallelism of the guidance of the sheets

  can be controlled by addition of additional sensors.

  According to an additional characteristic of the method proposed by the present invention, additional stations can

  be controlled by the addition of additional sensors.

  In the latter case, a clock coupled with the mechanism

  advance of the product in the form of sheets, makes it possible to synchronize

  several stations through the micro-processor.

  The present invention will be better understood by means of the

  detailed description of a mode of implementation taken as

  non-limiting example and illustrated by the schematic diagram

of the single appended figure.

  The method of controlling the separation of leaves in

  isolated leaves and detection of gaps that may

  come during the power supply, can be implemented by means of a single pair of sensors 10,11, which provides both this control and this detection. The pair of sensors 10, 11 is coupled with an analog-digital converter 21 and with a microprocessor 22. The microprocessor 22 adapts

  automatically the response sensitivity of the sensors 10,11.

  For example, each time the sheets are changed,

  at 30, the pair of sensors 10, 11 is set to the thickness of the first sheet of a stack. This adaptation can be done whatever the density of the sheets 30, because

  depreciation or impairment or modification of

  thickness is taken into account in its entirety between the

  10,11 during the passage of a sheet. Control

  is therefore even insured in case of total depreciation. Capabilities

  10,11 are photoelectric sensors. To measure

  the thickness of the sheets 30, it is also possible to use

Capacitive or magnetic sensors.

  The sensors 10, 11 preferably operate by pulse.

  to improve performance. The generator

  The rhythm used is then the microprocessor 22, which

  requires synchronization of read rates.

  The described process can be expanded, in a simple way, by

  addition of other pairs of sensors, no additional components

  not otherwise required. All you need is

  store new addresses in the micro-process-

  sor. Such extensions make it possible, for example, to detect

  an inadmissible misalignment as regards

  the parallel guidance that is prescribed for the leaves.

  By adding a clock 41, coupled with the feed device 40 provided for transporting the sheets 30, it is possible to

  obtain, via the microprocessor, a synchro-

  several stations, which is independent of speed.

Claims (7)

  1.- Process for controlling the isolation of iso-   detection and detection of deficiencies in leaf feeding.   the isolates of machines intended to treat them, characterized in that a pair of sensors (10, 11) ensures both the control of the separation of the leaves into sheets   isolated and the detection of deficiencies, by permeation   or the thickness of the sheets (30), by converting the result obtained into an analog-to-digital converter (21), and introducing the result into a microprocessor (22) for operation, in that the thickness of the sheet passing between the sensors (10,11) is measured and   stored in the microprocessor (22) as a   their reference for the following sheet (30), and that the microprocessor (22) controls the synchronization of the rates Sensor reading (10,11).   2.Procédé according to claim 1, characterized in that   the sensors (10, 11) are photoelectric sensors. -   3. A process according to claim 1, characterized in that the measurements of the thickness of the sheets (30) are ensured   by magnetic sensors (10,11).   4. A process according to claim 1, characterized in that the measurements of the thickness of the sheets (30) are ensured   by capacitive sensors (10, 11).   5. A process according to claim 1, characterized in that the parallelism of the guide sheets (30) is controlled   by addition of additional sensors (10, 11).   - 6.- Method according to any one of claims 1 and   characterized in that additional stations are   controlled by the addition of additional sensors (10, 11).   7. A method according to claim 6, characterized in that a clock (41) coupled with the sheet advance mechanism (30), allows synchronizing several positions by   via the microprocessor (22).