Spf Section - Sharp AR-M550N Service Manual

7. SPF section

No. Name
1 Document tray
2 Pickup roller
3 Document feed roller
4 Separation roller
5 No. 1 resist roller
6 Transport roller 1 (Drive)
7 Transport roller 2 (Drive)
8 No. 2 resist roller
9 Paper exit roller (Drive)
10 CIS unit
B. Operational descriptions
(1) Timing chart
To increase the document replacement speed, preliminary feed is per-
formed for the second and the following documents when two or more
documents of A4/Letter size or smaller are scanned.
For this purpose, each transport roller is provided with a clutch to per-
form independent control.
Transport speed 360mm/s
SPFFAN
Fan motor
SPFMCLK1, 2
Timer from SPF motor ON
SPFC
Document feed clutch
STRRC
Document transport resist clutch
STRRBC
Document transport resist brake clutch
STRC
Document transport clutch
STRBC
Document transport brake clutch
SPPD1
Document transport sensor 1
SPPD2
Document transport sensor 2
SPPD3
Document transport sensor 3
SRRC
Resist clutch
SRRBC
Resist brake clutch
SPPD4
Document transport sensor 4
Scanner scan
CIS scan
SPOD
Document exit sensor
1
9 10 8
Paper feed tray for documents. Max. loading capacity of documents: 150 sheets (80g/m²) or 19.5mm or less
Picks up a document and transports it to the document feed roller.
Feeds documents.
Separates paper to prevent against double feed.
Performs document feed resist.
Transports documents.
Transports documents.
Makes synchronization between the document lead edge and the scan start position.
Discharges documents.
Scans the back surface of a document.
Letter (216mm) 65 sheets (Single surface)
COPY key ON
167 ms 167 ms
(60mm) (60mm)
30 ms
67 ms
67 ms (24mm)
SIM adjustment
SIM adjustment
50 ms
50 ms
(18mm)
(18mm)
10 ms 10 ms
5 ms
5 ms
36 ms
SIM adjustment
5 ms
10 ms
5 ms
10 ms
50 ms 50 ms
(18mm) (18mm)
923 ms
10 ms
10 ms
Default 37mm (102.8ms)
Default 26mm (72.3ms)
SIM adjustment SIM adjustment (Image rear edge alignment)
(Image lead edge alignment)
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 113
A. General
Sheet documents are automatically fed and transported for continuous
scanning.
The front and the back surfaces of duplex sheet documents can be
scanned at a time.
2 3 4 5 6
7
Function
In addition, an electromagnetic brake is employed for each transport
roller because it reduces the motor load when compared with the
mechanical brake.
ON simultaneously with print start
OFF when the last paper SPOD off
First sheet: Paper feed start after booting the motor (Clutch ON)
Off at 24mm (67ms) from SPPD1 on (SIM adjustment)
ON again after 30ms from OFF, and OFF after 60mm (167ms)
Second and the following sheets: The 2nd sheet start simultaneously with SPPD1 off (Clutch ON)
OFF at 24mm (67ms) from SPPD1 on (SIM adjustment)
ON simultaneously with SRRC on, and OFF after 60mm (167ms)
First sheet ON simultaneously with the second ON of SPFC (paper feed CL)
OFF after 18mm (50ms) from SPPF1 off
Second and the following sheets ON simultaneously with SRRC on
OFF after 18mm (50ms) from SPPD1 off
First sheet ON simultaneously with SPPD1 on
Second and the following sheets OFF before10ms of STRRC on
ON after 5ms of STRRC off
First sheet ON simultaneously with STRRC
50 ms and OFF simultaneously with SPPD3 on
ON before 36ms (SIM adjustment) of SRRC on
ON after 5ms of STRC off
OFF before 10ms of STRC on
ON when scan ready OK (cycle time 923ms)
OFF after 18mm (50ms) of SPPD3 off
ON simultaneously with SPPD3 on
OFF before 10ms of SRRC on