AMETEK 1970 User Manual
Series 1970
Gemco
™
Drive-Chek
TM
Control Catalog
. . . OFFERS ENGINEERED PROTECTION FROM . . .
• BROKEN DRIVE CHAINS
• VIBRATION
• LOOSE DRIVE CHAINS
• SHOCK DAMAGE
DRIVE-CHEK
WITH GEMCO ROTATING
CAM LIMIT SWITCH
2
DESCRIPTION
The DRIVE-CHEK is a multi-purpose sub base that is
mounted under a chain or belt driven mechanism. The unit
serves three purposes; namely, a broken chain or belt
detector, a chain or belt tightener, and a shock and vibration
isolator.
A Gemco Indicator Switch is provided with each DRIVE-
CHEK Unit to indicate when a drive belt or chain failure has
occurred. Shock and vibration from the machine to the
hinge plate of the DRIVE-CHEK Unit are dampened by coil
springs on one end of the hinge plate and an elastomeric
support on the other end.
The springs also maintain a constant tension in the drive
belt or chain. DRIVE-CHEK is of rugged welded construction and is painted to prevent corrosion. The drive chain or
belt can be attached to the mechanism being driven from
either above or below the DRIVE-CHEK base.
The mounting and set up procedures for the DRIVE-CHEK
Indicator Switch and the location of the coil springs are outlined on pages 4 and 5.
DRIVE-CHEK INDICATOR SWITCH
Function and Installation
A Gemco single pole double throw switch with mounting
plate is supplied with each DRIVE-CHEK Unit and can be
easily mounted inside the Gemco Rotating Cam Limit
Switch enclosure. A Gemco double pole double throw
switch can also be supplied at additional cost.
Three holes are drilled in the base of the Rotating Cam Limit
Switch (see pages 6 and 7 for size and location) to mount
the DRIVE-CHEK Indicator Switch. After the unit is mount-
ed on the machine with the Rotating Cam Limit Switch and
drive chain in place, the two coil springs between the stationary and movable part of the unit will be compressed to
nearly their solid height.
The indicator switch is then adjusted to be engaged. If the
chain breaks or runs off its sprockets, the coil springs will
raise the hinge plate and the indicator switch will be disengaged (when the drive is below the hinge plate). The switch
would be wired into the control circuit of the machine drive
to stop the machine.
When ordering the DRIVE-CHEK Unit with the Gemco
Rotating Cam Limit Switch, there will not be any additional
charge for drilling the holes in the Rotating Cam Limit Switch
enclosure for the Gemco Indicator Switch.
1980 NEMA 1 1980 NEMA 4 and 12
No. of
Circuits Catalog Number Catalog Number
2 – 4 1970-104 1970-1204
5 – 6 1970-106 1970-1206
7 – 8 1970-108 1970-1208
9 – 12 1970-112 1970-1212
13 – 16 1970-116 1970-1216
17 – 20 1970-120 1970-1220
21 – 24 1970-124 1970-1224
Addition Replacement indicator switch
S.P.D.T. Cat. No. 1950-1404
D.P.D.T. Cat. No. 1950-1405
DRIVE-CHEK for Gemco Catalog Section
1980 Rotating Cam Limit Switches*
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