3 Stage Conveyor - 第24页
TECH NICAL RE FERE NCE DRIVES & SE NSOR S 1.18 High Throughput Conveyor Manual Chapter Issue 2 May 02 Board at Lef t/Right Sensors The board at lef t and board at right sensors are bac kground suppression opto type s…
TECHNICAL REFERENCE
DRIVES & SENSORS
Chapter Issue 2 May 02 High Throughput Conveyor Manual 1.17
Rail Home Sensor The rail home sensor is a through beam opto type sensor.
The rail home sensor feeds directly to the Multiplexer controller and is used to
set the datum position for the moving rear rail. From this datum position, the
moving rail stepper motor moves the rear rail the amount of steps needed to
obtain the rail width set in the current board file. During machine initialization,
(power-up or upon exiting diagnostics), the rear rail moves to the rear of the
machine until the rail opto vane enters the rail home sensor, the motor is driven
in the opposite direction until the vane clears the home sensor and the motor
stops, the rear rail is now at the home position.
NOTE
Homing Sequence of this chapter refers.
Figure 1-13 Rail Home Sensor Location
Rail Home
Sensor
Rail Home
Opto Flag
(home vane)
View on Right Hand Side of Machine
TECHNICAL REFERENCE
DRIVES & SENSORS
1.18 High Throughput Conveyor Manual Chapter Issue 2 May 02
Board at Left/Right
Sensors
The board at left and board at right sensors are background suppression opto
type sensors.
These two sensors are used to detect a board at the input and output of the print
station rail. As the machine is bi-directional the functions of both sensors are
reversed when the pass through direction is changed.
The input sensor is used to check for the presence of a board when upline
transfer starts. The board is transported to its position and processed after
which it is transferred to the output sensor where it stops unless the downline
conveyor is free to receive it.
These optos are fitted with a yellow LED along with a sensitivity control. There
is a small amount of positional adjustment in the bracket but generally it is not
necessary to reset it.
NOTE
For sensor sensitivity adjustment refer to Adjustment and Settings section of
this chapter.
Figure 1-14 Board at Left/Right Sensor Locations
Auxiliary Rail
Sensors
The auxiliary rail sensors are diffuse opto type sensors.
There are two sensors, one on each of the auxiliary conveyors. As the machine
is bi-directional the position of each sensor is reversed when the pass thru
direction is changed.
Each sensor is used to detect a board on the conveyor. The belt motors stop
when a board is detected unless, the downline machine, (which can either be
the print station or an external machine, depending on the conveyor and the
pass thru direction) is free to receive it.
Board at Right Sensor
Board at Left Sensor
Front Print Station Rail
Plan View on Machine - Printhead Removed
PULNIX
TM-6EX
WARNING SHARP EDGE
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WARNING SHARP EDGE
PATENTNo 5157438
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Auxiliary Rail (4 Positions)
Rear Print Sation Rail
Auxiliary Rail
Sensor
Auxiliary Rail
Sensor
TECHNICAL REFERENCE
SEQUENCES
Chapter Issue 2 May 02 High Throughput Conveyor Manual 1.19
SEQUENCES
Homing
Sequences
The print station rail is homed during machine initialization only, (during power-
up or upon exiting diagnostics).
When the home command is received the rear print station rail is driven (in the
reverse direction) to the rear of the machine until the home vane, attached to it,
is detected by the rail home sensor. Upon detection (sensor ON) the motor is
driven in the opposite direction until the vane clears the home sensor and the
motor stops (sensor OFF).
Figure 1-15 Rail Timing Diagram
Rail Positioning There is a fixed relationship between steps of the stepper drive motor and rail
movement (in mm) due to the gearing ratios and pitch of the driving leadscrews.
Therefore when a width is selected this is multiplied by the steps/mm factor and
sent to the stepper drive system.
All positions are relative to the home position.
Home Position
Fwd
Stepper
Motor
Home
Sensor
0
Stopped
Rev
Vane leaves sensor
Vane enters sensor