Rockford Fosgate DETECT-A-FINGER RKC-502 Installation Manual page 13

Other Components That May Be Required For Mechanically
Operated Welders
Most welders are controlled electrically, pneumatically or mechanically; if not, other components may be required.
Review this section for typical applications of the Detect-A-Finger®. Accessory equipment and components, such as
solenoid air valves or air cylinders are available from Rockford Systems for your convenience. If you require assistance
on the application of such components, please contact the factory.
Mechanical to Electro-Pneumatic Conversion—Convert from mechanical operation by removing the treadle and
replacing it with an air cylinder. The cylinder bore and stroke (push or pull type) can be determined from actual
machine measurements and the location of attachment to the welder linkage. The air cylinder is controlled by a 3-way
normally closed 120 VAC solenoid air valve. Adjustable flow control valves may be employed to smooth the welder
arm movement and a filter-regulator-lubricator and pressure gauge assembly is also required. The Detect-A-Finger®
controls the solenoid air valve.
RCL Series Air Cylinders
One of the following pull-type air cylinders may be adequate to operate the welder:
Single-acting spring-return air cylinders are usually supplied with a swivel-clevis mount as standard. Other special
cylinders, such as clevis mount, flange mount (either end) or foot mount are also available. They can be push-type
(spring inside cylinder), or pull-type (spring on cylinder rod, as illustrated above). The main consideration must be that
the cylinder is a single-acting spring-return type (not double acting) to meet best safety practices. When mounting
the cylinder, be sure it is secured in such a manner that it will not vibrate loose, bind or rub on some other part of the
machine.
RCL-001
Machine Size
¼ to 7
(Tons)
Size
1 / " x 1"
1
(Bore x Stroke) 8
Pull Force
50 lb
(@ 75 PSI)
NPT Port
¼"
Size
zThe assembly consists of the cylinder, two mounting feet, mounting pin, drive yoke, drive pin, and yoke lock nut. This
assembly is illustrated at the bottom of page 14. Locate this assembly on the machine so that the feet can be mounted
to a convenient surface. The yoke should be attached to the welder linkage, and the air inlet should be oriented toward
the air solenoid valve location.
The air cylinder should be mounted in the most logical position to operate the welder linkage most efficiently. The
main requirement in locating the cylinder assembly, is that the piston rod will have a straight, in-line pull (or
push) when attached to the operating linkage. When applying an air cylinder to the machine, make sure that
the cylinder rod, yoke or any moving parts will not bind after installation. Adjust so that the air cylinder bottoms
at the end of each stroke. The air cylinder will operate in any position. The operating linkage may be connected to
the air cylinder by any convenient means. Be sure the rod stroke is not too long because it could cause jackknifing of
the cylinder. If this is a concern shorter stroke cylinders are available. Too much air pressure may damage the operating
linkage. Please consider these points when installing any air cylinder.
Make certain that the drive yoke and lock nut are located approximately halfway down on the threaded portion of the
piston rod in order to provide for either up or down adjustment when necessary. Attach one end of the flexible rubber
hose in the threaded cylinder inlet port and tighten firmly.
Note: Threaded air joints do not generally require sealant; however, "Teflon" tape may be used to prevent leakage.
Rockford Systems, LLC
Call 1-800-922-7533
SECTION 2—INSTALLATION OF COMPONENTS
(If furnished—See enclosed manual KSL-096)
RCL-002 RCL-003
8 to 35 36 to 70
1½" x 1" 2" x 2"
100 lb 200 lb
¼" ¼"
Detect-A-Finger Drop Probe Device-Welder
®
Pull-Type Air Cylinder
13