Section 2-- Identification and Function of Parts 2-14
© 2008, Satake USA Inc.
(ALL RIGHTS RESERVED)
The product flow on each of the Chutes is viewed by one CCD Sensor. If the
ScanMasterII is a two-view machine, the Chute will be viewed from the Front and
the Rear. Each CCD Sensor has 240 pixel elements “looking” at the product flow
across the width of the Chute.
The 240 pixels for each Chute are divided into 10 sets of 24 pixels, one set for each
channel. Defect width detection “counts” the number of successive (one after the
other) Light or Dark pixels within each set of 24 pixels to determine if the defect will
be classified as a reject. It is important to note that the Front and Rear views count
independently. It is also important to note that the counting of Light and Dark
pixels starts over for each channel. This means that a count of Dark or Light pixels
at the end of Channel 1 will not carry over to Channel 2.
For systems using five channel chutes, there are two ejectors for each channel.
When these systems are fitted with the corresponding chip on the Amplifier PCB, the
pixel count is evaluated within each set of 48 pixels. Thus, a spot size count
continues for the full width of each channel, but is reset between channels.
The Light button determines the minimum defect widths when removing products
that are lighter than normal. Setting the button to a low number will reject product
with small and large light defects. Increasing the number will reject only larger light
objects.
The Dark button determines the minimum defect widths when removing products
that are darker than normal. Setting the button to a low number will reject product
with small and large dark defects. Increasing the number will reject only larger dark
objects.
2.5.1.3 BACKGROUND POSITION
Background adjustment is made from the BACKGROUND SCREEN. The position of
the background is displayed on the SETUP1 SCREEN for information only. The
number displayed is the feedback from the position potentiometer on the
background motor. The background adjustment procedure is covered in Section
2.6.
2.5.1.4 EJECTOR TIMING
2.5.1.4.1 DELAY ADJUSTMENT
The air ejector used to reject defective objects is not in the same physical position
as the optical view. In order to remove defects without removing an excess of good
product, some time must pass between when a product is classified as being a reject
and the time when the air ejector “fires”. This time period is called Ejector Delay. A
correct setting of the delay time period will allow the object to travel from the
viewing point to the rejection point.
The Delay button provides an adjustable Delay time from 12.4 milliseconds to 15.4
milliseconds in 0.1 millisecond increments. The button setting does not display the
decimal, so the setting divided by 10 is the actual delay. A Delay button setting of
140 (14.0 ms) is most common for small and medium grain products.
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