Wrap Spring Clutches and Clutch/Brakes

Warner Electric Founded in 1927, Warner Electric has grown to become a global leader in the development of innovative electromagnetic clutch & brake solutions. Warner Electric engineers utilize the latest materials and manufacturing technologies to design long life, easy-to-use clutches and brakes that provide improved accuracy and repeatability. Warner Electric offers the broadest selection of industrial clutches, brakes, controls and web tension systems available from a single manufacturer. Reliable Warner Electric components are used in a wide range of markets including material handling,...

Warner Electric WRAP SPRING CLUTCHES AND CLUTCH/BRAKES Warner Electric offers a complete line of standard wrap spring clutches and clutch/brakes, available for immediate delivery through our nationwide network of power transmission distributors. As the industry leader in clutch/brake technology you can count on Warner Electric for complete application assistance and after sale service. Wrap Spring Product Line Page 2 Principle of Operation Page 3 Application Examples Page 4 CB Mounting Requirements Page 8 CB Stop Collar Adjustment Page 10 CB Series Clutch/Brakes Page 11 SCB Series Clutch/Brakes...

Wrap Spring Product Line CB Series Clutch/Brake Package Long Life Clutch/Brake Wrap Spring Clutches Each CB Series unit is a completely self-contained, packaged clutch/brake assembly designed to start and stop a load rapidly and accurately without any cumulative error. In fact, at speeds up to 1800 rpm, loads are started and stopped within +1/2° per revolution. CB Series units are solenoid actuated with standard models available in 12, 24, or 90 VDC as well as 115 VAC configurations. The Super CB Series is a high performance version of the standard CB Series, providing up to five times the life....

Basic Design Principles Principle of Operation Brake control tang The three basic components of the wrap spring clutch are the input hub, output hub, and spring. The inside diameter of the spring is slightly smaller than the outside diameter of the two hubs. Rotation at the input hub in the direction of the arrow engages the spring and positively locks the two hubs together. Adding a control tang enables the spring to be disengaged, allowing the input hub to overrun. Clutch control tang Combination Clutch/Brake The control tangs are used to hold open the clutch or brake spring, which are wrapped...

Application Examples The features of wrap spring clutches and brakes; accuracy, repeatability, high torque-to-size ratio, low power consumption and long life make them an ideal solution for a wide range of motion control applications. Basic functions include overrunning, single revolution, random positioning start-stop, high cycle rate rapid start-stops and accurate, repeatable positioning. Typical Applications n Conveyors n Rotary indexing tables n Packaging equipment n Bagging machinery n Collators n Cut-off machines n Vending machines n Copiers n Food processing equipment n Paper feeds n Folders...

Application Examples Industrial Stitchers and Staplers Print Head The motor drives a large flywheel and a cam connected to the stitcher head. The CB or Super CB wrap spring clutch/brake provides one complete cycle, always stopping at the same precise position in time for the next cycle. Warner Electric’s CB and Super CB units never require any adjustment or lubrication, and provide non-cumulative error for cycle-to-cycle accuracy and consistency. In this printing application, a photoelectric sensor detects the registration mark on the web and signals the CB or Super CB clutch/brake to cycle....

Selection For Product Selection Follow 3 Easy Steps Wrap spring clutches and brakes are pre-packaged, pre-assembled units which are as easy to select as they are to install. The simple three step selection process includes: required load/speed performance data is known and unit size is uncertain, use the technical selection process starting on page 36 which will help you review the neces ary aspects of your application. s Step 1 etermine the clutch or D brake function Step 2 etermine size function D (as on page 7) Step 3 Verify design considerations This selection process is based on the assumption...

Selection Selection Charts – RPM vs. Shaft Diameter Step 3 Verify design function considerations Once the appropriate series and model size have been determined, review the design considerations. A complete checklist of these and other options available are detailed in the How to Order section for each series. Design Considerations All Models n  CW or CCW rotation n  Single or multiple stop collar n  Bore size Super CB and CB Series n  AC or DC solenoid n  CB-5, CB-6, CB-8 and CB-10 available in the long life, Super CB Series (SCB). See pages 19–25 for specific details. WSC Series n  ub input/shaft...

CB Mounting Requirements While Warner Electric wrap spring clutches are self-contained, packaged products, which are easy to mount, a few simple precautions should be taken to ensure maximum life. All Warner Electric wrap spring clutch products are designed to be installed in parallel shaft applications where they are fully supported by the shaft on which they are mounted. Each clutch/brake backing plate assembly has three or four mounting holes, plus an anti-rotation slot, and is designed to serve as a torque arm rather than as a rigid mounting plate. The plate should be restrained from rotating...

CB Mounting Requirements Vertical Mounting When it is necessary to mount a unit vertically, mount it so the input hub is oriented in the upward position as illustrated in Figure 4. Figure 4 Pin drive not bolted to input Maximum thread engagement specified by factory Customer's Bearingmounted pulley Correct Mounting Thread Engagement Requirements Just a reminder . . . While mounting a sprocket or pulley to the input hub of your CB-2, CB-4, CB-5, CB-6, CB-8 or CB-10 the screws/bolts used must not protrude through the flange or hub. This will interfere or jam the control collar assembly, therefore...