Type JC Automatic Reset Torque Limiters
Technical Features
- Instant release at pre-set torque
- Smooth hold-out for one revolution
- Means for motor switch-off
- Automatic self-engagement on restart without loss of phasing
Normal Running
The drive is transmitted between the hub flange 1 and the housing 2 by the balls 3, spring-loaded into the pockets on the flange face.
Disengagement
On overload, the balls are displaced axially through the housing, further compressing the springs. Once out of their pockets, the balls roll on the face of the hub flange for one revolution before re-engaging and synchronizing the drive.
Torque Adjustment
The release torque is set by tightening nut 4 thus increasing the spring pressure. After setting, the nut is locked with a set screw and plug.
Installation
Clutches can be supplied pilot bored or finish bored and keywayed. The hub may be fitted to either shaft and should be located against a shoulder to resist the resetting spring force and locked by means of set screw in the hub flange. The drive flange may be replaced by a sprocket, pulley, etc., or connected to a coupling. See pages 12 and 13.
Application
This type of protection is ideally suited to drives such as wrapping and packing machinery where it is essential to restart in the correct sequence and where access for manual resetting is not available.
Type JC clutches should always be used with a limit switch to bring the drive to rest within a few revolutions thus preventing possible damage by continual releasing and resetting.
Type JB Automatic Reset Torque Limiters
Technical Features
- Instant release at pre-set torque
- Smooth hold-out for one revolution
- Means for motor switch-off
- Automatic self-engagement on restart without loss of phasing
- Also available fitted with pulley (JBP)
- Rigid Coupling (JBR)
Normal Running
The drive is transmitted between the hub flange 1 and the drive flange 2 by the balls 4, spring-loaded into the pockets on the ball detent ring 3 secured by dowels.
Disengagement
On overload, the balls are displaced axially through the hub flange, further compressing the springs. Once out of their pockets, the balls roll on the face of the hub flange for one revolution before re-engaging and synchronizing the drive.
Torque Adjustment
The release torque is set by tightening nut 5 thus increasing the spring pressure. After setting, the nut is locked by a set screw.
Installation
Clutches can be supplied pilot bored or finish bored and keywayed. The hub may be fitted to either shaft and should be axially constrained against a shoulder to resist the resetting force and locked by means of a set screw onto the shaft key. The drive flange may be connected to a flexible coupling or can carry a sprocket or pulley.
Application
This type of protection is ideally suited to drives where it is essential to restart in the correct sequence and where access for manual resetting is not available.
Applicable to all variants.
Note: Type JBB clutches should always be used with a limit switch to bring the drive to rest within a few revolutions thus preventing possible damage by continual releasing and resetting.