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Long Stroke Drop-Probe Devices |
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LONG STROKE DROP-PROBE DEVICES for safeguarding riveters, spot-welders, eyeletters, stakers, and similar machines Electric-Air Unit This unit is available in two models. One model is for mounting on the right side of a machine, and the other model is for mounting on the left side of a machine. The location will be determined when facing the machine. It can also be located either above or below the point of operation. Note: If it will be located below the point of operation, please consult the factory. Location of this unit should be determined by the availability of mounting surface, the size or shape of the workpieces, and the throat depth of the machine. The standard-stroke unit can provide a probe stroke of up to 2". The long-stroke unit is designed and manufactured to provide up to a 4 1/2" stroke of the sensing ring assembly. This drop-probe device functions by allowing a mechanical sensing ring or probe to drop by gravity around the point-of-operation hazard prior to each intended machine stroke. If this sensing probe encounters the operator's fingers and fails to drop to a preset point, no tripping signal of the machine results. The unique design of this unit not only prevents the tripping signal, but also leaves the device mechanically locked out. The internal mechanism has an exclusive interlock consisting of steel cams. When the unit is actuated, the sensor drops to its adjustable preset point moving the sensing cams out of the way of the tripping cams. The tripping cams continue on and actuate an air valve or limit switch; therefore, tripping the machine. If the sensor travel is obstructed, the sensing cams do not move out of the path of the tripping cams. The unit locks up at that point and no tripping signal results. This concept also provides for one universal device as opposed to separate designs for various machines cycled in different ways. (See drawing.) 
Sequence of Operation These units are air or electrically operated with a foot switch. On the air-operated units, an air cylinder input module operates the unit. If the sensing ring drops to its preset point, the output module, which is a three-way valve, opens admitting air to the machine tripping mechanism. An air foot switch is available if the machine is not already equipped with one. Electrically operated units are electric-air. The air cylinder input module is fitted with a 115-V AC solenoid control valve. The output module is an enclosed limit switch with capacity of 15 A, 125 V AC suitable for operating a tripping solenoid or solenoid air valve. These units function the same way as the air-operated units and have the same air source requirements. An electric foot switch is available if the machine is not already equipped with one. (Click here for electric foot switches.) Note: If other inputs or outputs are required for your application, please consult factory for part numbers. Air-Operated Devices On air-operated devices, air is used to energize the air cylinder input module on the unit. This energizes an internal mechanism which in turn causes the sensing ring to drop to its preset point. The output module is a three-way valve which opens to admit air to the cylinder that trips the clutch of the machine. (See illustration.)
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Ordering Information
If a mechanical riveter is converted to a pneumatic riveter, in addition to the Detect-A-Finger®, the following components are required:  
Note: When installing a spring-return-type cylinder, the existing spring-return mechanism or mechanical return equipment must not be removed. |
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Ordering Information
Electrically Operated Devices On electrically operated devices, air is still required to energize the air cylinder input module on the unit. On standard units, a 115-V AC electric solenoid control valve is attached to the air cylinder. This valve is connected to the electric foot switch. Once this valve energizes the internal mechanism, the sensing ring will drop to its pre-set point. The output module is an enclosed limit switch with capacity of 15 A, 125 V AC suitable for operating a tripping solenoid or solenoid air valve. Special voltages for solenoid valves and limit switches are available. Please consult the factory. (See illustration.)
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Ordering Information
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If a mechanical riveter is converted to an electrically-operated riveter, in addition to the Detect-A-Finger®, the following components may be required: RCL-043 1/4" Filter-Regulator-Lubricator Air Cylinder (Push or Pull) (Please consult
the factory for part number)
CTD-065 Heavy-Duty Electric Foot Switch |
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Ordering Information
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Optional Polycarbonate Shields
Note: The price for parts NEP-104, NEP-107, and NEP-108 is for 2" height. Other shield heights are available; please consult the factory. |
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