Abstract
An ejection system (202) coupled to a rotary die cutting (RDC) unit (210) in a cutting system (204) for a web printing press (200) is described. The ejection system (202) comprises one or more pairs of edge guide sensors (224) to detect edges of a substrate (208) received on a turning roller (222) which feeds the substrate into the RDC unit. Based on the detected edges of the substrate, the controller determines a lateral shift of the substrate due to which the RDC unit cuts the substrate into defective blanks. Further, a speed detection unit detects a speed of the substrate being fed into the RDC unit. Based on the detected speed, the controller determines a time of arrival and a position of the defective blanks arriving out of the RDC unit and selectively directs the defective blanks to an ejection conveyer (232).
Specification
CLIAMS:1. An ejection system (202) coupled to a rotary die cutting (RDC) unit (210) in a cutting system (204) for a web printing press (200), the ejection system (202) comprising:
one or more pairs of edge guide sensors (224) disposed over a substrate (208), wherein one pair of edge guide sensor from amongst the one or more pairs of edge guide sensors (224) is placed alongside a turning roller (222) to detect edges of the substrate (208), wherein the turning roller (222) is to feed the substrate (208) into the RDC unit (210);
a speed detecting unit (226) coupled to the turning roller (222) to detect speed of the substrate (208) being fed into the RDC unit (210); and
a controller (228) coupled to the one or more pairs of edge guide sensors (224) and the speed detecting unit (226) to:
determine a lateral shift in the substrate (208) being fed into the RDC unit (210) based on the detected edges of the substrate (208), wherein the RDC unit (210) cuts the substrate (208) into defective blanks based on the lateral shift;
determine a time of arrival and a position of the defective blanks arriving at a transferring conveyer (230) coupled to the RDC unit (210) based on the detected speed, wherein the defective blanks are stacked together to form bundles before arriving at the transferring conveyer (230); and
selectively direct the defective blanks to an ejection conveyer (232) coupled to the transferring conveyer (230) for ejecting the defective blanks towards a defective blanks pile based on the determined lateral shift and the determined time of arrival.
2. The ejection system (202) as claimed in claim 1 further comprising a conveyer controller (238) coupled to the controller (228) and the ejection conveyer (232), wherein the conveyer controller (238) selectively directs the defective blanks to the ejection conveyer (232) upon receiving an eject mode signal from the conveyer controller (238) based on the determined lateral shift and the determined time of arrival.
3. The ejection system (202) as claimed in claim 1, wherein the ejection system (202) further comprises at least one audio unit (240) to provide audio cue indicative of the lateral shift in the substrate (208).
4. The ejection system (202) as claimed in claim 3, wherein the controller (228) activates the at least one audio unit (240) upon determination of the lateral shift.
5. The ejection system (202) as claimed in claim 1, wherein the ejection system (202) further comprises at least one display device (242) to provide visible cue indicative of the lateral shift in the substrate (208).
6. The ejection system (202) as claimed in claim 5, wherein the controller (228) activates the at least one display device (242) upon determination of the lateral shift.
7. The ejection system (202) as claimed in claim 1, wherein the web printing press (200) is a gravure printing press.
8. The ejection system (202) as claimed in claim 1, wherein the RDC unit (210) is coupled to one or more printing units (206) of the web printing press (200), and wherein the substrate (208) is fed into the RDC unit (210) from the one or more printing units (206).
9. The ejection system (202) as claimed in claim 1, wherein the substrate (208) is one of a web of paper for manufacturing magazines and newspapers, a web of corrugated paperboard for manufacturing packaging products, and a web of plastic for manufacturing packaging products.
10. The ejection system (202) as claimed in claim 1, wherein the one or more pairs of edge guide sensors (224) include photo sensors, proximity sensors, ultrasonic proximity sensors, Hall Effect sensors, optical edge sensors, and digital line and edge detection sensors.
11. The ejection system (202) as claimed in claim 1, wherein the speed detecting unit (226) comprises one or more of a cycle switch and or a tachometer.
12. A cutting system (204) in a web printing press (200), the cutting system (204) comprising:
a turning roller (222) to receive a substrate (208) from one or more printing units (206) of the web printing press (200);
a rotary die cutting (RDC) unit (210) coupled to the turning roller (222), wherein the turning roller (222) is to feed the substrate (208) into the RDC unit (210);
an ejection system (202) coupled to the RDC unit (210), the ejection system (202) comprising:
one or more pairs of edge guide sensors (224) disposed over the substrate (208), wherein a guide sensor from a pair of edge guide sensor from amongst the one or more pairs of edge guide sensors (224) is placed on either side of the turning roller (222) to detect edges of a substrate (208) on the turning roller (222);
a speed detecting unit (226) coupled to the turning roller (222) to detect speed of the substrate (208) being fed into the RDC unit (210); and
a controller (228) coupled to the one or more pairs of edge guide sensors (224) and the speed detecting unit (226) to:
determine a lateral shift in the substrate (208) being fed into the RDC unit (210) based on the detected edges of the substrate (208), wherein the RDC unit (210) cuts the substrate (208) into defective blanks based on the lateral shift;
determine a time of arrival and a position of the defective blanks arriving at a transferring conveyer (230) coupled to the RDC unit (210) based on the detected speed, wherein the defective blanks are stacked together to form bundles before arriving at the transferring conveyer (230); and
selectively direct the defective blanks to an ejection conveyer (232) coupled to the transferring conveyer (230) for ejecting the defective blanks towards a defective blanks pile based on the determined later shift and the determined time of arrival.
13. The cutting system (204) as claimed in claim 12, wherein the substrate (208) is printed with predefined patterns by the one or more printing units (206) of the web printing press (200).
14. The cutting system (204) as claimed in claim 13, wherein the substrate (208) is a web of paperboard for manufacturing hinged lid packages (HLP).
15. The cutting system (204) as claimed in claim 13, wherein the predefined pattern is a laser block.
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