Infinity EX Rail System Module.pdf - 第10页

INFINITY EX RAIL S YSTEM M ODULE DRIVE S AND SEN SORS 15.1 0 Technical Reference Manual Chapter Issue 2 Jan 04 Board at Left/Right Sens ors The board at left and board at right sensors are diffuse opto type sensors. Thes…

INFINITY

RAIL SYSTEM MODULE

DRIVES AND SENSORS

Chapter Issue 2 Jan 04 Technical Reference Manual 15.9

Rail Home Sensor The rail home sensor is a through beam opto type sensor.

The sensor is used for accurately determining the front and rear rail widths.

During machine initialization, (power-up or upon exiting diagnostics), the rear

rail moves to the rear of the machine where upon the rail opto vane enters the

rail home sensor, the rear rail is now at the home position.

NOTE

Homing Sequence of this chapter refers.

The rail home sensor feeds directly to the Multiplexer controller and is used to

set the datum value for the rail width (508.5mm - 508.7mm).

Figure 15-6 Rail Home Setting

Home Position

Adjustment

508.5 - 508.7mm

85mm Rail Transport Height

Front Rail

(Fixed)

Rear Rail

(Moving)

Adjustable Through

Beam Opto Sensor

Home Sensor Adjustment

Screw (0.5mm Pitched

Thread)

Rear Rail

Opto Flag

Sensor Forward Securing Screw

View on Right Hand Side of Machine

Enlarged View of Rail Home Position Sensor

INFINITY

RAIL SYSTEM MODULE

DRIVES AND SENSORS

15.10 Technical Reference Manual Chapter Issue 2 Jan 04

Board at Left/Right

Sensors

The board at left and board at right sensors are diffuse opto type sensors.

These two sensors are used to detect a board at the input and output of the

transport belt. As the machine is bi-directional the functions of both optos are

reversed when the pass through direction is changed.

The input sensor is used to start the transport belt on detection of a board. The

board is transported into the machine and processed after which it is transferred

to the output sensor where it stops and waits for the command to be passed onto

the next machine in the line.

These optos are fitted with a red and green 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 as the footprint used by the diffuse opto is large enough

to cope with the holes in an average production board.

Figure 15-7 Board at Left/Right Opto Locations

BoardTransport

Belts

Boardat Right

Sensor

Boardat Left

Sensor

Moving Rail

FixedRail

Plan View on Machine - Printhead Removed

PULNIX

TM-6EX

INFINITY

RAIL SYSTEM MODULE

SEQUENCES

Chapter Issue 2 Jan 04 Technical Reference Manual 15.11

SEQUENCES

Homing Sequence The rail system is homed during machine initialization only, (during power-up

or upon exiting diagnostics).

When the home command is received the rear moving 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).

This position has a set dimension of 508.5mm to 508.7mm measured between

the inside of each rail, (Positioning section of this chapter refers)

Figure 15-8 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

12V

Stopped

Rev

Vane leaves sensor

Vane enters sensor