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Product Information

RBW-1000  Brochure (PDF Format)

RBW-2000 Brochure (PDF Format)

RBW Customer Worksheet


RBW-1000 Bustle Wheel Assembly

Bustle Wheels

U.S. Automation presents the RBW-1000 and RBW-2000 Register Bustle Wheel Systems.  Both models feature tool-less adjustment of the bustle wheel head assembly.  Positioning of the bustle wheel can be accomplished quickly and safely without the need of hand tools which could fall into the press.  All bustle wheel trunnions and threaded pivots are precision machined for easy adjustment.  All bustle wheel head assemblies are anodized to help prevent corrosion.  

RBW-1000 Features: 

  • Aluminum Anodized Head Assembly

  • Delrin Outer Wheel For Long Life

  • High Speed Precision Ball Bearings Rated For 3000 FPM

  • Aluminum Hub For Increased Bearing Cooling

  • Zinc Plated Steel Mounting Bar

  • Easy, Smooth Adjustment Without Tools

Each  Bustle Wheel Assembly Includes:

  • Bustle Wheel Head Assembly (Number of heads vary with press size)

  • Mounting Brackets (Side Frame Block or Shaft Mount) 

  • Zinc Plated Steel Mounting Bar

The RBW-2000 Air-Assisted Register Bustle Wheel System has all of the features as the RBW-1000 plus the added advantage of air assist. A small cushion of air floats the web over the top of the bustle wheel.  This allows the bustle wheel head to be positioned over the top of a printed image area without marking.  The air-assist feature can be turned ON or OFF conveniently using the control station located on the bar. When the air-assist feature is turned off, the RBW-2000 can be used as a conventional bustle wheel.

RBW-2000 Features:

  • All features of the RBW-1000 plus;

  • Air-Assisted Bustle Wheel Head

  • Bar Mounted ON-OFF Controls

  • Bar Mounted Regulator Assembly


RBW-2000 Air-Assisted Register Bustle Wheel Assembly

Why Use Bustle Wheels?

Bustle wheels improve print-to-print color registration by reducing the effects of paper fan-out on web offset presses.  Fan-out is the physical lateral growth of the web (and printed image) as it goes through the printing process.  

As the web grows in size laterally, so to does the image area.  If the image area grows too large, there will be registration and fit  issues when overprinting the next color on top of the image area.  

In order to reduce the effect of fan-out, bustle wheels are installed between print units.  There is typically a bustle wheel mounted in each alley. By moving the bustle wheels slightly into the paper, the paper will begin to bustle (dimple) causing the outer edges of the paper to move inward.  The inward movement of the paper helps to fit the previous printed image to the next image that will be overprinted.   This greatly improves the fit of the color-to-color register.

Fan-out is not linear.  Depending on the amount of moisture being introduced into the paper separate adjustments are  made to each bustle wheel. 

 

 



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