Testing control performance

Check the performance of the hold-to-run controls using the following tests:

  • Inch movement - mark the cylinder and machine frame, inch and measure
  • Crawl speed - count the number of revolutions per minute and multiply by the cylinder circumference.

Check performance of trip nip devices at regular intervals, particularly where slow crawl cleaning has been identified as appropriate. Deterioration of the trip nip performance will lead to a significant risk to the operator during cleaning on slow crawl. On tripping, the length of movement of the trip bar should be greater than the stopping distance of the cylinder, ie cylinder movement ceases within the deflection travel distance of the bar.  

To test trip nip performance:

When press is stationary, measure the total deflection of the trip nip bar (t). Mark the cylinder and machine frame. Operate the crawl control. Push the trip nip with a cardboard tube when the two reference marks are in line. Measure the distance moved by the cylinder (c) and compare measurements (t) and  (c); (t) should be greater.

Link URLs in this page

  1. Printinghttps://www.hse.gov.uk/printing/index.htm
  2. Managing printing safelyhttps://www.hse.gov.uk/printing/basics.htm
  3. HSE and the printing industryhttps://www.hse.gov.uk/printing/hse.htm
  4. Frequently asked questionshttps://www.hse.gov.uk/printing/faqs.htm
  5. Overview - Health topicshttps://www.hse.gov.uk/printing/health-topics.htm
  6. Overview - Chemicals in printinghttps://www.hse.gov.uk/printing/coshhessentials/index.htm
  7. Digital (Ink Jet) Printershttps://www.hse.gov.uk/printing/coshhessentials/digital.htm
  8. Flexographic printershttps://www.hse.gov.uk/printing/coshhessentials/flexographic.htm
  9. Gravure printers https://www.hse.gov.uk/printing/coshhessentials/gravure.htm
  10. Laminating https://www.hse.gov.uk/printing/coshhessentials/laminating.htm
  11. Lithographic printershttps://www.hse.gov.uk/printing/coshhessentials/lithographic.htm
  12. Screen printershttps://www.hse.gov.uk/printing/coshhessentials/screen.htm
  13. Overview - Dermatitishttps://www.hse.gov.uk/printing/dermatitis/index.htm
  14. Postershttps://www.hse.gov.uk/printing/dermatitis/posters.htm
  15. Noisehttps://www.hse.gov.uk/printing/noise.htm
  16. Overview - Manual handlinghttps://www.hse.gov.uk/printing/manual/index.htm
  17. Manual handling operations regulations https://www.hse.gov.uk/printing/manual/regulations.htm
  18. Safety topicshttps://www.hse.gov.uk/printing/safety-topics.htm
  19. Overview - Safety topicshttps://www.hse.gov.uk/printing/safety-topics.htm
  20. Fire and explosionhttps://www.hse.gov.uk/printing/fire-explosion.htm
  21. Overview - Machinery safetyhttps://www.hse.gov.uk/printing/machine/index.htm
  22. Risk assessment guidelineshttps://www.hse.gov.uk/printing/machine/risk-assessment-guidelines.htm
  23. Safeguarding printing presseshttps://www.hse.gov.uk/printing/machine/safeguarding-printing-presses.htm
  24. Control definitions for limited powered movementhttps://www.hse.gov.uk/printing/machine/control-definitions.htm
  25. Defined safe systems of work for press cleaninghttps://www.hse.gov.uk/printing/machine/defined-safe-systems.htm
  26. Safe systems of work for cleaning printing presseshttps://www.hse.gov.uk/printing/machine/safe-systems-cleaning-presses.htm
  27. Testing control performancehttps://www.hse.gov.uk/printing/machine/testing-control-performance.htm
  28. Overview - Slips and trips in the printing industryhttps://www.hse.gov.uk/printing/slips/index.htm
  29. Slips and trips in production areashttps://www.hse.gov.uk/printing/slips/production.htm
  30. Overview - Resourceshttps://www.hse.gov.uk/printing/resources.htm
  31. Linkshttps://www.hse.gov.uk/printing/links.htm
  32. Publicationshttps://www.hse.gov.uk/printing/information.htm
  33. Statisticshttps://www.hse.gov.uk/printing/statistics.htm
  34. Safety at power-operated paper cutting guillotines https://www.hse.gov.uk/pubns/books/power-guillotines.htm
  35. Handling newspaper and magazine bundleshttps://www.hse.gov.uk/pubns/indg470.htm

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Updated: 2021-11-09