XLi EDGE QubicaAMF Pinspotter
Section 3 Page 3-8 Rev. Date: 10/2016
3.2.2 Encoders & Switches
The positions of the Table and Sweep are controlled by the Chassis using optical
encoders located within the top casting on each motor. The encoders consist of a
perforated disk and a light source and sensor assembly. When the motor is
energized, the disk, which is attached to the motor shaft, spins. As it spins, the light
beam is alternately interrupted and sensed. Each time the light beam is sensed a
count is registered. Each count represents a movement of a fraction of a degree of
the Table or Sweep drive shafts. From this count the position of the shaft, in
degrees, is calculated by the Chassis, and is used to stop the motors at the desired
locations.
The Table and Sweep drive shafts each have an encoder and disk assembly mounted
on them. These are similar to the ones on the motors except that there is only a
single perforation in each of the disks. These perforations are aligned with the light
beam when the Table and Sweep are at the Home position and provide an absolute
indication of when these shafts are correctly positioned for the start of a cycle. The
Chassis can utilize this information to correct any drift, or accumulation errors, in
the counts by resetting the counts to zero when the shafts are at the home position.
This self-correcting feature helps to ensure accurate and consistent operation.
The Off Spot Switch
The off spot switch is an electro-mechanical switch that actuates when the table
contacts a pin that is standing but has moved off its spot beyond the normal respot
range of the table. Its purpose is to prevent damaging the machine if an off-spot
condition occurs.
The Optical Bin Switch (BSO)
The optical bin switch is a light-sensing switch that actuates when the #9 pin (the
last pin delivered by the distributor) is deposited in the bin. Its purpose is to allow
the machine to spot pins only when the bin is full. The optical design eliminates the
need for springs and moving parts that could interfere with the proper positioning
of the pin in the bin pocket.
3.2.3 Protection Devices
In addition to the circuit breakers on the power supply panels and chassis, as well as
fuses contained in the chassis (see Chassis Manual), the back end motor and the
table and sweep motors are protected by thermal overload devices called “Klixon”
switches that can be identified by a red reset button located on each motor. They
shut off the motor when it exceeds a predetermined temperature caused by an
overload or an electrical fault, and must be manually reset after an appropriate cool
down period.
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