1.0Operation
Throughout this manual, there are a number of Hazard Warnings that must be read and understood in order to prevent possible personal injury and/or damage to the equipment. Carefully read these warn- ings. They are included to protect you!
1.1Description:
This manual describes two Airflex@ timing control devices, namely, the Airflex@ Cam Limit Switch and the Airflex@ Timing Rotorseal. The cam limit switch is a rotary cam timing switch device. The timing rotorseal combines the features of a rotary cam timing switch with those of a rotary air seal in one compact unit. Both of these devices are primarily designed to control the operating functions of mechanical power presses. Both devices are also referred to as timers in this manual, since the timing opera- tion for both devices is the same.
When these devices are properly wired into the appropriate Airflex@ press control system (refer to Manual CP 3080), these devices can provide the following functions:
•Inch
•Single stroke
•Continuous
•Semicontinuous
•Monitor the stopping effective- ness of the braking system
The Airflex@ press control system requires two of the timers, in any combination, to control the above functions and to monitor each other for failure and shaft breakage.
These devices can be furnished for either clockwise or counterclockwise rotation. The direction of rotation of the device is identified by a decal on the cap and is determined by viewing the device from the cap end. Timing rotorseals supplied with Airflex” FSPA clutch and brake packages are assembled for counterclockwise rotation unless otherwise specified on the order.
The cam limit switch can be furnished for either shaft mounting or for foot mounting with a chain drive (see the illustrated Parts List in Section 4.0). The timing rotorseal is designed to be assembled to the flywheel or
Cam No. | “A” Timer |
1 | Nonrepeat |
2 | Top Stop (Continuous) |
3 | Brake Monitor |
4 & 5 | Top Stop (Single Stroke) |
bullgear of an Airflex@ standard press application clutch and brake package (see Figure 2).
1.2How It Works:
The operation of the timing section of the timing rotorseal is the same as that of the cam limit switch. In this respect, both devices are referred to as timers in this manual. There are five shaft mounted cams which, when rotated, open and close four automotive type breaker points (see Figure 1) as LS1, LS2, LS3 and LS4.
LS1 and LS2 are controlled by cams No. 1 (24) and No. 2 (26) respectively (see Section 4.0 for item numbers in brackets). LS3, when used for brake monitoring, is controlled by a two piece cam No. 3 consisting of an insert (28) and an outer cam (28A). An optional one piece cam No. 3 is supplied with both devices that replaces the two piece cam for applications that do not require brake monitoring. LS4 is controlled by split cams No. 4 (33) and No. 5 (33A). Cam functions are discussed in Section 1.2.1.
The timing rotorseal, besides providing the same timing functions as does the cam limit switch, also provides a means of air delivery from a stationary source to operate a rotating component such as the Airflex” clutch. The seal between the stationary center section
(11)and the rotating adapter (1) is provided by the inner and outer carbon seals (16 and 19). The lapped surfaces of these seals are held against the rotating adapter (1) by inner and outer springs (12 and 13). Air enters the stationary center section (11) and passes through the seals into the rotating adapter (1).
Cam Functions:
The Airflex” press control system requires two timing devices. To differentiate between the timers both the cam limit switch and the timing rotorseal have a decal, affixed to the end cap, with tabs labeled “A” and “B”. Therefore, one timer should be labeled “A’ and the other “B”; the unused tabs are re- moved. To be consistent with the Airflex@ press control wiring diagram the timer that monitors the brake should be labeled “A”.
The control functions of the cams are:
“B” Timer
Nonrepeat
Nonrepeat
Semicontinuous Brake Monitor or Special Function
Top Stop (Single Stroke)
2