Claims
- 1. A system for preventing damage to printing cylinders of a web printing press by maintaining tension in a web in the event of web breakage, comprising:(a) a first roller having a plurality of valley and peak portions; (b) a second roller having a plurality of valley and peak portions; (c) a motor device disposed in communication with said first and second rollers to rotate said first and second rollers to pull a broken web though said first and second rollers; and (d) stripper fingers disposed in said valley portions of said first and second rollers to prevent a broken web from wrapping around said first and second rollers.
- 2. The system of claim 1 wherein said first and second rollers are disposed to engage a broken web with line contact.
- 3. The system of claim 1 wherein said motor device is configured to rotate said first and second rollers at a surface speed greater than a surface speed of said printing cylinders.
- 4. The system of claim 1 further comprising means for engaging said first and second rollers with said broken web.
- 5. The system of claim 1 further comprising a web break detector.
- 6. The system of claim 1 wherein said first and second rollers are disposed downstream of said printing cylinders.
- 7. The system of claim 1 further comprising a frame in which said first and second rollers are mounted.
- 8. A method for preventing damage to the printing cylinders of a web printing press in the event of web breakage by maintaining tension in a broken web, comprising the steps of:(a) detecting a web disturbance indicative of a web break; (b) rotating at least two rollers; (c) engaging said rollers with said broken web; (d) pulling said broken web away from said printing cylinders with contact exerted by said rollers; and (e) preventing said broken web from wrapping around said rollers.
- 9. The method of claim 8 wherein said pulling step includes the step of pulling said broken web away from said printing cylinders with line contact exerted by said rollers.
- 10. The method of claim 8 wherein said engaging step includes the step of moving said rollers into engagement with said broken web.
- 11. The method of claim 8 wherein said engaging step includes the step of engaging said broken web with rollers each having a plurality of peak and valley position.
- 12. The method of claim 8 wherein said preventing step includes the step of disposing stripper fingers within said valley portions of said rollers.
Parent Case Info
This application is a continuation of Ser. No. 08/821,404 filed Mar. 20, 1997, now abandoned, which is a continuation of Ser. No. 08/435,006, filed May 4, 1995, now U.S. Pat. No. 5,678,484, which is a continuation-in-part of Ser. No. 08/327,095, filed Oct. 21, 1994, now U.S. Pat. No. 5,443,008, which is a continuation of Ser. No. 08/036,928, filed Mar. 25, 1993, now U.S. Pat. No. 5,398,610, each of which are herein incorporated by reference.
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Foreign Referenced Citations (5)
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2357208 |
May 1975 |
DE |
3822496 |
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Continuations (3)
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Number |
Date |
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Parent |
08/821404 |
Mar 1997 |
US |
Child |
09/002755 |
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US |
Parent |
08/435006 |
May 1995 |
US |
Child |
08/821404 |
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US |
Parent |
08/036928 |
Mar 1993 |
US |
Child |
08/327095 |
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US |
Continuation in Parts (1)
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Number |
Date |
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08/327095 |
Oct 1994 |
US |
Child |
08/435006 |
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US |