Canon Color Bubble Jet BJC-5000 Series, Руководство по обслуживанию

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Part 4: Technical Reference
4-4
BJC-5000
1.4 Print Drive
To discharge ink from the head for printing, the printer outputs control signals from
the printer controller to the BJ head.
The control signals consists of the drive control signal for discharging ink from the
head’s nozzles and the temperature control signal for adjusting the head’s temperature
so that the ink discharge is uniform.
To achieve best printing results, both these control signals are optimized by the MPU &
printer controller and sent from the carriage ribbon cable’s signal contacts to the BJ
head.
The drive frequency varies depending on the printing mode and installed BJ cartridge.
1.4.1 Print drive control
a) Black BJ cartridge drive control
The black BJ cartridge drive control is performed by dividing the head’s 128 nozzles
into 8 blocks (16 nozzles per block). These blocks are further divided into odd and
even blocks (8 nozzles per odd/even block). Ink is simultaneously discharged either
from all odd block nozzles or from all even block nozzles. Control signals for the odd
block nozzles are block enable signals 1, 2, and 3 (BENB 1, 2, 3). Control signals for
the even block nozzles are the even/odd enable signals (Even/Odd ENB).
Heat enable 0 and 1 (HENB 0, 1), which are the heater drive control signals for
discharging the ink, are comprised of a pre-pulse and main pulse. To achieve
optimum ink discharge constantly, internal conditions such as the head’s rank,
printer temperature, and head temperature are monitored and the heater drive pulse
width is varied before the pulse is output. Furthermore, the print drive signal from
the printer controller is transferred to the shift resistor in the BJ head according to
the HLATCH timing. When the print drive signal (HDATA) is latched and the print
control and heater drive control signals are output together, the heater for the
corresponding nozzles is driven and ink is discharged.
b) Color BJ cartridge (multi-drop) drive control
The printhead of the multi-drop type color BJ cartridge has 136 nozzles and each
nozzle has two heater boards at the front and back. The multi-drop drive is
performed by appropriately using these front and back heaters.
The sequence of ink discharge is as follows. The 136 nozzles in the head are divided
into 8 blocks (16 nozzles per block) and each block is separated into two functional
units (8 nozzles per unit). Ink is sequentially discharged from each unit. The
nozzles for discharging ink are selected by block enable signals (BENB 1, 2, 3) and
Figure 4-4 Printing Sequence (Black BJ Cartridge/Standard Mode)
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
E
O
BE8
E
O
E
O
E
O
E
O
E
O
E
O
E
O
BE7
BE6
BE5
BE4
BE3
BE2
BE1
: :
BE1 to BE8: Block Enable 1 to 8
E: Even Enable
O: Odd Enable
A: Heat Enable 0
B: Heat Enable 1