KE-750_QA表.pdf - 第38页

FUNCTION NAME Feeding PWBs Smoothly - 2 Function/Performance CHECK/ADJUSTMENT METHODS (REMEDIAL ACT ION PROCEDURE) ASSURED QUALITY Reliability QUALITY CHARACTERISTI CS (SPECIFICATION VALUES) CATEGORY Safety Product Image…

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FUNCTION NAME Supporting the PWB from Underside Function/Performance CHECK/ADJUSTMENT METHODS (REMEDIAL ACTION PROCEDURE)
ASSURED QUALITY Reliability
QUALITY CHARACTERISTICS (SPECIFICATION VALUES) CATEGORY Safety
Product Image
ROLE IN FUNCTION (MEANING OF SPECIFICATION VALUES)
POSSIBLE MALFUNCTIONS (CAUSED BY INCORRECT SPECIFICATION VALUES)
COMPONENTS
NO. Part No. Part Name Associated Quality Characteristics
1 E20217150A0 Backup pin assembly
2
3 MODEL KE-750/760
4 UNIT Transport REF. NO.
5
NAME
8
6 FUNCTION Supporting the PWB from
7
NAME Underside
8
9
10
QA Table
1. Loosen the adjusting nut, determine the pin height, and then secure the adjusting nut.
1. Pin height: 96 ±0.1 mm
A
djusting nut
1. Adjustment of height from BT table top surface to PWB bottom surface
1. Too high: The BU pin pushes the PWB up.
Too low: The BU pin does not reach the PWB.
FUNCTION NAME Feeding PWBs Smoothly - 2 Function/Performance CHECK/ADJUSTMENT METHODS (REMEDIAL ACTION PROCEDURE)
ASSURED QUALITY Reliability
QUALITY CHARACTERISTICS (SPECIFICATION VALUES) CATEGORY Safety
Product Image
ROLE IN FUNCTION (MEANING OF SPECIFICATION VALUES)
POSSIBLE MALFUNCTIONS (CAUSED BY INCORRECT SPECIFICATION VALUES)
COMPONENTS
NO. Part No. Part Name Associated Quality Characteristics
1 E2017725000 Transport belt S
2 E2016725000 Transport belt C
3 E2046725000 PWB inner MODEL KE-750/760
4 E2051721000 Drive belt UNIT Transport REF. NO.
5 E2014725000 Drive belt C
NAME
9
6 E2011725000 Drive shaft S FUNCTION Feeding PWBs Smoothly - 2
7 E2004725000 Drive shaft C
NAME
8
9
10
QA Table
1. Mark the transport belt at 200-mm intervals and pull the adjustment pulley so that the distance between the two adjacent
markings measures 202 mm.
1. Transport belt tension: Keep the belt taut with its length stretched by 1% from its free length.
2. Transport pulley movement: The pulley should move smoothly with the belt.
2. The transport pulley should turn smoothly when the belt is driven.
3. Clearance between PWB inner and transport belt: Within 0.2 mm
If it does not turn smoothly, check for sufficient clearance from the PWB inner and a pulley set screw (axis center) left
loose.
4. Transport belt joint thickness: 1 +0.15/-0.1 mm
5. Motor belt C tension: 1.8 to 2.2 kgf
Check grease on drive pulley R x thrust washer x rail plate R.
6. Motor belt tension: 2.7 to 3.3 kgf
Check to see if a thrust washer is wedged in mechanism.
7. Drive shaft torque: 0.2 N.m or less
The optimum gap in drive pulley is 0.3 to 0.5 mm.
3. Apply a 0.2-mm-dia. bar to the space between the PWB inner and transport belt and assemble parts with care not to allow
an excessive gap. Too narrow a gap results in the PWB inner and the belt getting too close together (especially at the
joint).
5. Take measurements using an acoustic wave type belt tensiometer (manufactured by Unitta).
(weight: 0.25, width: 6.0, span: 88)
6. Take measurements using an acoustic wave type belt tensiometer (manufactured by Unitta).
(weight: 0.25, width: 6.0, span: 78)
7. Insert a pin into the set screw tapped hole in drive pulley F and pull the pin end with a spring balance to measure the
starting torque. If the torque is heavy, check for a pulley thrust washer wedged in mechanism and a warped drive shaft.
1 to 4. To drive the transport belt with sufficient clearance or no slip.
5 to 7. To set the optimum torque of the drive shaft. To prevent the timing belt from skipping cogs.
1. Transport belt too slack -> Belt slipping
Transport belt too tight -> Drive shaft torque increased, belt snapping off.
2. Binding transport pulley -> Transport belt stopped, transport motor out of correct timing, generating heat.
3. No gap -> Belt and PWB inner get too close together, belt stopped, transport motor out of correct timing, generating heat.
4. Thick joint -> PWB inner and radius get too close together, belt stopped, transport motor out of correct timing, generating
heat.
5, 6. Too tight -> Large drive shaft torque
Too slack -> Belt cogs being skipped
7. Heavy torque -> Transport motor out of correct timing, generating heat. Transport belt stopped.
FUNCTION NAME Positioning PWBs in Height Direction Function/Performance CHECK/ADJUSTMENT METHODS (REMEDIAL ACTION PROCEDURE)
ASSURED QUALITY Reliability
QUALITY CHARACTERISTICS (SPECIFICATION VALUES) CATEGORY Safety
Product Image
ROLE IN FUNCTION (MEANING OF SPECIFICATION VALUES)
POSSIBLE MALFUNCTIONS (CAUSED BY INCORRECT SPECIFICATION VALUES)
COMPONENTS
NO. Part No. Part Name Associated Quality Characteristics
1 E2044725000 Transport rail FC
2 E2073725000 Transport rail RC
3 E2074725000 Support plate C MODEL KE-750/760
4 E2061725000 Rail stand CL UNIT Transport REF. NO.
5 E2062725000 Rail stand CR
NAME
10
6 E2123721000 PWB guide plate F FUNCTION Positioning PWBs in Height
7 E2124721000 PWB guide plate RA
NAME Direction
8 E2125721000 PWB guide plate RB
9
10
QA Table
Mount a dial indicator on camera bracket D, loosen transport rail F set screws and support plate set screws, and adjust so that
the difference in height among four measurement points shown below is within 0.1 mm and that the difference in height from
the calibration block is within 0.1 mm.
1. With the BU table in the upper position, the difference in height between four points in the transport rail and calibration
block should be within 0.1 mm.
Transport rail set screw
Support plate
set screws
Support plate
set screws
Transport rail F setscrews
Transport rail F set screws
Measurement point
s
Measurement points
The calibration block serves as the reference for components placement in the height direction. Aligning the reference
surface height with the block ensures good component release height of the head.
If the distance between the point of component release and the PWB surface on which the component lands is too wide, the
head tends to throw the component away, resulting in poor placement accuracy.
If the height of the transport rail FC and RC has been changed, check the difference in height from the transport pulley at the
end of the IN and OUT transport rails.
Adjust the transport rail height so that the step difference measures within 0.2 mm (at four places).