PS288_OwnersMnl_PriorTo2009 - 第132页

System Theory • Input and Output Modules 4—8 PS288 Owner’s Manual Input and Output Modules Devices may be presented to and re-p ackaged from the system in various combinations. The input and out put modules include: • T …

System Theory • Vision System

PS288 Owner’s Manual 4—7

motion controller interface card. When combined with the X–Y gantry sys-

tem, devices may be picked up and placed into any physical location within

the operating envelope.

The PNP head has an integrated probe tip through which a vacuum or posi-

tive pressure may be applied to attach or remove devices from the probe tip.

The probe tip is interchangeable to accommodate various sizes and package

types.

Socket Actuator

The Socket Actuator is a pneumatic driven solenoid used to actuate the sock-

ets before the PNP head places devices into or removes devices from them.

Sensors attached to the solenoid indicate the position of the Socket Actuator

and verify that it is safe to move devices to and from the socket.

The two sensors, one for the up position and one for the down position, are

adjustable for optimum sensing of the Socket Actuator’s position. When the

“up” sensor is active, the gantry system may retract the PNP head and move

to another area of the machine. When the “down” sensor is active, the PNP

head may extend to pick up a device from or place a device into a program-

ming socket. The Socket Actuator is not used when picking devices from or

placing devices into their input/output media.

Each sensor has an LED which turns red when the Socket Actuator is in the

up or down position.

Vision System

The vision system is used in conjunction with the PNP head to ensure accu-

rate alignment of the devices to be inserted into the sockets for program-

ming. Using data in a reference vision file for the device type to be

programmed, the PNP head can compensate for the misalignment of a device

in the X, Y, and R (up to 30 degrees) axes. Misalignments can be corrected

within 0.001 inches. The vision system cannot compensate for Z-axis errors.

The vision system consists of a camera, light ring, interface card, and soft-

ware. The light ring and camera are mounted onto a specialized bracket

below the work surface in a location dependent upon the configuration of the

machine. The interface card is installed in the Handler Computer, as is its

software interface.

The light ring is used to illuminate the device being analyzed by the camera

so that an accurate picture may be taken. The LED light source is powered

by 24VDC.

The camera is mounted to a bracket below the work surface and is optimally

focused onto a device attached to the PNP head when in the down position.

Focus and alignment data are set using the calibration routine described in

“Calibrating the Vision System” on page 5-41, and by the vision system soft-

ware.

System Theory • Input and Output Modules

4—8 PS288 Owner’s Manual

Input and

Output Modules

Devices may be presented to and re-packaged from the system in various

combinations. The input and output modules include:

• Tube input

• Tube output

• Tape input

• Tape output

• Tray input

• Tray output

These input and output modules may be used in any combination.

Tube Input and Output

The tube input and tube output modules are attached to the work surface

toward the front of the machine. Each module accommodates a number of

different sized tubes and each is adjustable. Tubes are inserted into the mod-

ules through holes in the safety shield designed for them. The input tube

module is slanted to cause the devices to slide toward the staging area, while

the output tube module is slanted to cause devices to slide away from the

staging area. There are no sensors to alert the user when a tube is full or

empty.

The tubes are gently vibrated to keep devices moving freely and reduce the

likelihood of device jams. The level of vibration may be varied using the

adjustment controls found on the right front panel of the machine. Each tube

vibrator is powered by 115 VAC from the I/O Controller.

Tape Input and Output

Manipulation of devices in a tape and reel form is supported in both input

and output modules, depending upon the configuration of the PS288. A tape

input feeder may be placed in a bracket on the right front of the PS288 to

provide the machine with devices to be programmed. Additionally, a tape

output system, attached to the Option Bay, can be equipped with either pres-

sure sealed cover tape or heat sealed cover tape capabilities.

The tape input feeder provides the system with devices to be programmed

via tape and reel. The tape is fed by a toothed sprocket along an adjustable

rail system. As the tape is fed, the cover tape is removed by a motorized

take-up reel, exposing the device to be picked from the tape. The tape is

advanced into the operating envelope one tape pocket at a time. Optical sen-

sors in the input tape module determine whether the tape pocket has a device

in place or is empty, as well as the position of the pocket in the tape. When

the PNP head removes the device from the tape pocket, the sensors detect the

pocket is empty and the tape is moved one position forward. Empty input

tape exits from the bottom of the tape feeder. It is not taken up on a reel, but

falls freely.

The tape output system allows programmed and marked (if a marking stage

is installed) devices to be placed in an output tape for use with another pick

and place machine on the production line or another facility. A reel of empty

pocket tape is placed on a spindle, and the tape is fed into an adjust-

able-width track. The tape is pulled through the track with a toothed sprocket

at a rate determined by the pitch (pocket size and distance) of the tape. Sen-

System Theory • Label Marking System

PS288 Owner’s Manual 4—9

sors determine the position of the tape and whether the tape pocket contains

a device or is empty. Other sensors determine whether the device is seated

properly in the tape before being covered.

When a device has been programmed, the PNP head moves the device to the

rear of the machine where a shuttle mechanism transports the device to the

marking stage (if installed), then to an empty tape pocket. Sensors determine

that the tape pocket contains a device, and the tape is advanced one position

as set by the pitch control on the tape output controller.

A roll of cover tape is installed on its dedicated spindle on the machine. It is

threaded through the tape output system so that it is applied to the pocket

tape before it is placed on an output spool. The cover tape may be pressure

sealed with a cold adhesive and pressure rollers or heat sealed with a hot

iron. The tape output system must be specifically configured for the type of

cover tape to be used. Sensors determine when the cover tape roll is empty

and needs to be changed.

When the tape is sealed, it is then collected on a takeup spool at the other

side of the tape output system. Sensors determine when the takeup spool is

full and needs to be removed.

Tray Input and Output

Devices may be presented from and returned to trays within the operating

envelope. Regardless of whether the PS288 uses static trays, the TF20 auto-

matic tray feeder, or the TF30 automatic tray feeder, there are two tray posi-

tions. Typically, blank devices are taken from the right-most tray,

programmed, and then placed back on the tray from which they came. The

left-most tray is typically used as a reject tray for devices that fail an opera-

tion during the programming routine.

The static tray input and tray output modules accept JEDEC and non-JEDEC

standard trays. The TF20 automatic tray feeder accepts JEDEC standard

trays, and the TF30 accepts all types of trays, including JEDEC standard.

Each type of tray must be “learned” by the PS288 so that the number of rows

and columns, as well as the pitch, is properly interpreted when picking

devices from, and placing devices in, the tray. Tray positions are fixed and

require no adjustment or calibration.

Label Marking

System

An option for marking devices is the label marking system which uses adhe-

sive labels.

In the label marking system the device is moved into the marking position. A

newly printed label is removed from its backing tape assisted by an “air

knife” mechanism. An air operated solenoid contains a specialized label

placement head consisting of a replaceable application surface designed for

the specific device package in use and a vacuum system. The labelling head

is moved over to and slightly above the waiting label, and a vacuum is

applied, removing the label from the backing. The head is then moved over

the device and lowered until the label adheres to the surface of the device

with direct pressure. Once the label is placed, the vacuum is removed, and

the head is moved back to the ready position above a newly printed label.