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Wrap Spring Clutches and Brakes

Thomson's Deltran Genuine Wrap Spring Clutches and Wrap Spring Brakes provide hundreds of simple motion processes that can be controlled through three basic control functions: overrunning, start-stop, single revolution, and brake. Literally hundreds of simple motion processes can be controlled through the three basic functions of wrap spring clutches and brakes—Overrunning, Start-Stop, Single Revolution and Brake. Some examples of well suited wrap spring clutch and wrap spring brake applications are:

  • Mail openers and inserters, collators
  • Bag making, paper feed
  • Food processing
  • Metal riveting, stapling and stitching
  • Paper edge trimming
  • Film advance
  • Inclined conveyors
  • Stackers
  • Conveyor diverter gate
  • Wire bending
  • Money counter
  • Paper printing and folding
  • Electromechanical Lifts

The basic wrap spring clutch and wrap spring brake consist of three elements: an input hub, an output hub, and a spring whose inside diameter is slightly smaller than the outside diameter of the two hubs. The torque capacity of a wrap spring clutch or wrap spring brake is a direct function of the diameter of the hub and the tensile strength of the spring.

  • Wrap spring clutches or wrap spring brakes will not slip. It will attempt to supply the torque demanded, up to the mechanical limitations of the spring.
  • The torque demand of the wrap spring clutch is equal to the system frictional torque of the load plus the dynamic torque of acceleration.

Thomson's Deltran offers GENUINE WRAP SPRING™ CLUTCH/BRAKE PACKAGES designed for convenience and long life.

Thomson's Deltran also offers GENUINE WRAP SPRING clutch and wrap spring brake ACCESSORIES such as dust cover enclosures or actuators and controls as a complete wrap spring clutch and wrap spring brake design solution.

Standard CB Series Wrap Spring Clutch-Brake Package

CB Series combination clutches and brakes accurately start and stop loads driven by a continuously rotating power source. CB units operate from a single AC or DC pulse, stopping the load within ±½° noncumulative at speeds up to 1800 RPM. Each unit is preengineered and pre-assembled for easy installation.

CB series wrap spring clutch & brake design

Super CB Series Wrap Spring Clutch-Brake Package

Super CB Series combination of clutches and brakes accurately start and stop loads driven by a continuously rotating power source. CB units operate from a single AC or DC pulse, stopping the load within ±½° noncumulative at speeds up to 750 RPM - depending on size. Each unit is pre-engineered and pre-assembled for easy installation. Super CB clutches and brakes provide 3 to 5 times longer life! The five sizes of Super CB clutch/brake packages offer extraordinary performance and durability for those applications requiring long life under high load, high duty cycle conditions. Thomson will retrofit standard CB-5, CB-6, CB-7, CB-8, and CB-10 models.

Super CB Series wrap spring clutch & brake design

SAC Wrap Spring Clutch Series

The SAC Series features four models of pre-assembled, solenoid actuated, wrap spring clutch packages. SAC units operate from a single AC or DC pulse to accurately start loads at speeds up to 1800 RPM, depending on size. Adjustable stop control collars provide easy and accurate output stop position settings. A typical SAC Series clutch will bring the load up to speed within 3 milliseconds. They are easy to interface with PCs and industrial control systems. SAC Series clutches are accurate, repeatable, fast acting, simple, maintenance free, and low cost.

SAC Series wrap spring clutches

PSI Wrap Spring Clutch Series

PSI Series clutches represent the most fundamental wrap spring clutch design. As a start-stop or single revolution clutch, it is actuated simply by external blocking or releasing of the stop collar. As a simple overrunning clutch it provides positive engagement of load to power source, but permits free overrunning when input power is slowed, stopped or reversed. All units can be supplied with hub input/shaft output or vice versa. Designed for applications where direct mechanical control is desired, the PSI Series clutch is a reliable, easily applied, low cost solution.

PSI series wrap spring clutches

SA Wrap Spring Clutch Series

SA Series clutches come in size 250 and 500, in both clockwise and counter-clockwise configurations. SA units are available as hub or shaft input, and can operate with an AC or DC power source. Each unit is preengineered and pre-assembled for easy installation.

SA Series Wrap Spring Clutch design

Custom Engineered Wrap Spring Products

Engineered products are specially designed to solve specific and unique application requirements. The products shown are the result of years of experience in providing innovative solutions for applications including paper feed drives, agriculture equipment, copiers, robotics, etc. These solutions are now available as engineered products which include the DL, MAC, SP, and BDNB Series.

Custom engineered wrap spring clutches
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