Control method and control for a web processing machine
AssigneeBaldwin-Korthe Web Controls, Inc.
InventorAlan Stuart McComb
Life of this patent
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Abstract
A control for a web processing machine such as for a printing press is described for detecting web breaks, faulty web sensors and inconsistent web threading conditions. A logic network is employed to compare web sensor signals with control signals to detect whether the web sensor signals are consistent with what is called for by associated control signals. Station status signals are produced to stop the machine when inconsistent conditions are sensed and cause appropriate web severing. A bypass control network is provided to inhibit the station status signals for slow speed checkout. However, when the machine speed exceeds a predetermined level, the bypass network is automatically deactivated and full machine control protection restored.
Claims12
A control for a web processing machine through which a web material is to be threaded for processing comprising
- sensing means for sensing the web at stations in the machine and producing web signals indicative thereof;
- control means for generating control signals individually indicative of whether the web is required to operatively engage the machine at a station thereof;
- station status means responsive to the web signals and the control signals for generating station status signals having a fault state indicative that the web has operatively engaged the machine at a station for which an associated control signal indicates that said engagement is not required;
- and
- means responsive to the status signals for producing a machine disabling signal when one of said status signals is in a fault state whereby operation of the machine is inhibited when the threading of the web at any one station is inconsistent with its associated control signal.
A control for a printing press through which a web material is to be threaded for printing comprising
- means for sensing the web at stations in the printing press and producing web signals representative of the operative engagement of web with the printing press at said stations;
- means for producing individually selectable printing press station control signals indicative of whether the web is required to operatively engage the associated printing press station;
- means associated with individual printing press stations and responsive to the web signals and respectively associated control signals for producing for each station a status signal having a station enabling state indicative that the web has operatively engaged a selected station while an associated control signal indicates that said operative engagement is required, said status signal further having a fault state indicative that the web has operatively engaged the selected station while the associated control signal indicates that said engagement is not required;
- means responsive to the status signals for producing a printing press enabling signal when the status signals indicated proper engagement of the web with selected stations and a press disabling signal when one of said status signals is in a fault state.
A method for protecting a web processing machine operating with a continuous web detected by web sensors located at stations in the press and with web severers for cutting the web comprising the steps of
- producing web signals indicative of the presence of web at said stations;
- generating control signals representative of whether associated web sensors are to be activated;
- comparing the web signal from each sensor with the control signal associated with the web sensor;
- producing an active station status signal representative of an operative station condition when the comparison indicates that one of the signals being compared is active;
- producing an inactive station status signal representative of an inoperative station condition when the comparison indicates that both or neither of the signals being compared are active;
- and
- enabling the web processing machine to operate when all of the station status signals indicate an operative condition and inhibiting the web processing machine from operating when any one of the station status signals indicate an inoperative station condition.
Dependencies are inferred from the claim text.