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2-3-2 Sensor mechanisms

This mechanism has two sensors for de-
tection, a dot pulse sensor and a reset
pulse sensor.

(1) Dot pulse sensor

The dot pulse sensor consists of an
encoder (slit disk) directly connected
to the motor and a photointerrupter
reading the rotation. The rotation read
(number of slits counted) is treated as
the DP signal that is the core of the
printing control.

(2) Reset pulse sensor

The reset pulse sensor uses a leaf switch which turns ON/OFF according to the head assem-
bly position.

This sensor detection signal represents the RP signal that specifies the print head home posi-
tion and printing start base position.

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Summary of Contents for MD-910

Page 1: ...DOT PRINTER JAN 1997 MD 910 without price TECHNICAL MANUAL ...

Page 2: ...erminals measuring analyzing equipment medical equipment and communication data equipment and has been designed to be as compact as possible Compact and lightweight High speed printing of up to 2 5 lines sec for MD 910 or 1 8 lines sec for MD 911 Clear printout with high resolution of 8 dots mm Paper width of print head Longer life of print head Simple mechanism for high reliability ...

Page 3: ...mechanism 8 2 3 5 Ribbon cartridge drive mechanism 11 2 4 External connection terminals 11 2 4 1 Terminal arrangement 11 2 4 2 Terminal mechanism 12 2 4 3 Terminal circuit diagram 12 3 Disassembly Reassembly 13 3 1 Tools 13 3 2 Disassembly procedure 13 3 3 Assembly procedure 14 3 3 1 Setting paper feed solenoid assembly 14 3 3 2 Setting the head assembly 15 3 3 3 Setting the paper feed assembly 16...

Page 4: ... off when the printer is carried or not used for a long period 5 Do not feed current to the print head if it is wet or moist If current is fed the print head may be damaged If the print head is wet or moist dry it fully and then start printing 6 Inserting register paper Cut the top end of the register paper straight it should never be fluffed or bent and insert it When the top end of the register ...

Page 5: ...ector Paper feeding solenoid Drive voltage DC 5 0 V Resistance 7 h 3 temperature 25 C Printing solenoid Drive voltage DC 5 0 V Resistance 1 7 h 0 3 temperature 25 C Motor Type DC brush motor Drive voltage DC 5 0 V Max current Approx 1 A Average current 0 3 A or less DC 5 0 V 25 C in continuous printing Paper Type Plane or recommended paper Paper width 57 5 mm Cut sheet 45 to 55 kg thickness 0 06 t...

Page 6: ... cartridge The head assembly is driven by the cylinder cam assembly connected to the gear box assembly which encloses the motor The driving force transmitted to the cylin der cam assembly is sent to the PF cam gear and PF6D cam through the paper feed gear Either the driving force trans mitted to the PF cam gear or the driving force transmitted the PF6D cam can be selected depending on the operatio...

Page 7: ... motor and a photointerrupter reading the rotation The rotation read number of slits counted is treated as the DP signal that is the core of the printing control 2 Reset pulse sensor The reset pulse sensor uses a leaf switch which turns ON OFF according to the head assem bly position This sensor detection signal represents the RP signal that specifies the print head home posi tion and printing sta...

Page 8: ...e register paper only when they move from left to right 1 Printing control Each print head has four printing so lenoids and each solenoid is turned ON OFF according to the printing data and the corresponding printing pins are activated to form character dots This printer however does not have a serial parallel conversion circuit Therefore ON L level OFF H level signals are directly provided to the...

Page 9: ...ne is produced by one print head movement 4 5 4 0 5 horizontal dots make up one character and the total number of horizontal dots in the print able area is 180 20 columns 2 4 5 dots Printable Area Home Position 5 mm 47 5 mm 5 mm Direction of Paper Feed Printing Solenoid A Printing Solenoid B Printing Solenoid C Printing Solenoid D Printing Solenoid A Printing Solenoid B Printing Solenoid C Printin...

Page 10: ...rve in the scribed groove so it moves slowly At this time printing is performed When the head assembly travels be yond the printable area the direction of movement is changed to the home position because the direction of groove is reversed and the head re turn spring tension is activated At this time the head assembly trav els at high speed because the groove is turned to the slow curve Register p...

Page 11: ...ting one line 1 Paper path The register paper is loaded from the back of the printer and moved to the paper feed roller and the pressure roller along the paper pressure guide The register paper moved is pressed against the paper feed roller by the pressure roller and fed upward when the paper feed roller turns The register paper then passes through the platen and the print head and comes out to th...

Page 12: ...iving force Normally this clutch wheel is not in con tact The sector gear assembly has a ful crum at the middle so if the protrusion is pressed down the teeth are raised to turn the clutch gear The clutch gear then is pushed out by the PF clutch spring and engages with the clutch wheel to rotate the paper feed roller This rotation i e the paper feeding depends on the amount of ascent of the teeth ...

Page 13: ...red so the armature assembly is inserted in the thin part of the return ring instead The armature assembly is linked with the paper feed solenoid When performing paper feeding with LF the paper feed solenoid turns ON and the armature assembly is de tached from the return ring The PF6D cam is set on the outside of the return ring and the driving force of the PF cam gear is transmitted by the cotter...

Page 14: ...90 The driving force converted is transmitted from the worm to the worm gear and the ribbon cartridge is turned by the ribbon drive pin Therefore the ribbon cartridge is always moving while printing is being performed 2 4 External connection terminals External connection terminals are located within the PCB terminal assembly and their connections are implemented by directly soldering the print pat...

Page 15: ...h GND 13 Printing solenoid E 14 Printing solenoid G 15 Paper feeding solenoid Solenoid is ON with GND 16 Reset pulse sensor output Power side 17 Reset pulse sensor output GND side 2 4 2 Terminal mechanism 2 4 3 Terminal circuit diagram 2 3 4 5 6 7 8 9 11 10 16 15 12 13 14 Printing Solenoid D Motor Dot Pulse Sensor 1st Printing Head 2nd Printing Head Reset Pulse Sensor Paper Feeding Solenoid Printi...

Page 16: ...without register paper in the printer 4 Check that the register paper is set properly 5 In maintenance work never leave any parts or screws in the printer 6 In disassembly and reassembly check that any wires and cords are not damaged and are laid out properly Handle these wires and cords carefully 3 1 Tools The list of necessary tools is as follows 1 Philips head screwdriver 2 Tweezers 3 Small rad...

Page 17: ...eed solenoid assembly 1 Place the core in core base as sembly At this time align the pro trusion of the core with the hole of the core base assembly 2 Insert the bobbin assembly where the core has already been fitted in the core base assembly At this time the lead wires face outside and there should be no gap be tween the bobbin assembly and the core base assembly ...

Page 18: ...tion of armature spring 4 Secure the armature assembly with the E ring and attach the armature spring to the hole of the armature as sembly Note When installing the E ring and armature spring use small radio pliers or tweezers 3 3 2 Setting the head assembly 1 Two tips of FPC are extended from the head assembly Bend the two tips at right angles from the notch line ...

Page 19: ...stall the head return spring in the head assembly 3 3 3 Setting the paper feed assembly 1 Apply Froil G 311S to the two parts of the paper feed roller shaft where pa per feed bracket touches 2 Apply Epnoc grease AP to the brake groove of the paper feed roller Note The paper feed roller must be free from sticky oil 3 Place the paper feed roller in the pa per feed bracket At this time the longer sha...

Page 20: ...he paper feed bracket with two platen spacers and two screws M2 2 5 7 Insert the clutch wheel in the paper feed roller shaft coming out of the pa per feed bracket Note When inserting push the clutch wheel until the claws of the clutch wheel are engaged with the shaft groove of the paper feed roller 8 Insert the clutch gear in the paper feed roller shaft 9 Apply Froil G 311S to the gear section of ...

Page 21: ...me assembly 2 After assembling align the protru sion a whirl stop of the cam shaft bushing with the notched hole on the right of the frame assembly 3 Bend the notched section on the left of the frame assembly to secure the motor of the gear box assembly Note 1 After securing this check that the cylinder cam assembly turns smoothly If not reinstall it 2 Handle the notched section on the left of the...

Page 22: ...s of the paper feed gear are horizontal At this time the squared notch of the cylinder cam assembly should face the back 2 Four sectored protruding parts of the PF cam gear should face the outside Engage the center of the protrud ing part that is horizontal when the inside cam faces down with the pa per feed gear 7 Apply Froil G 311S to the two cotter pin springs and then insert them in cotter pin...

Page 23: ...the PF6D cam in the PF cam gear and secure it with the E ring 11 Apply Froil G 311S to the outside and surfaces of the PF6D cam 12 Insert the pressure roller in the pres sure roller shaft and set it in the frame assembly Note The pressure roller must be set in the notched hole of the frame assembly ...

Page 24: ...the PF clutch spring is shortened 2 When assembling align the protru sions on the bottom of the paper feed bracket with the holes of the frame assembly 15 Secure both the paper feed and the paper pressure guide to the frame as sembly with two screws M2 2 5 16 Apply Froil G 311S to the pivot of the ribbon drive and the teeth of the sec tor gear assembly 17 Insert the sector gear assembly in the piv...

Page 25: ...ecure it with the E ring 19 Set the sector gear spring between the sector gear assembly and the frame assembly 20 Apply Froil G 311S to the fitting hole of the ribbon drive and then insert the ribbon drive pin from under the bot tom of the frame assembly 21 Insert the worm gear in the ribbon drive pin ...

Page 26: ... assembly to the right of the frame assembly with a single screw 24 Install the reset pulse sensor assem bly to the right of the frame assembly and secure it by bending the notched section of the right of the frame assem bly Note Handle the notched section of the right of the frame assembly carefully because it may be dam aged if it is bent or turned often 25 Secure the PCB terminal assembly to th...

Page 27: ...return spring which is set in the head assem bly on the notched section of the right of the head assembly 29 Insert the tip of the shaft pin which is set in the head assembly in the groove of the cylinder cam assembly Note Before insertion the squared notch of the cylinder cam as sembly should face the back and the head assembly should touch the right of the frame assembly ...

Page 28: ...n to the head as sembly terminals two of the paper feed solenoid assembly and terminals two of the reset pulse sensor assem bly Note When soldering the terminals of the reset pulse sensor assem bly two terminal leaves are pressed back but the leaf tips should not protrude from the case 33 Pass the curl of the grounding spring through the hole in the near side right of the frame and then hang the V...

Page 29: ...4 7605 Armature NC25703 00 1 X 4 7 1904 7593 E Ring 1 2 E60312 00 1 X 4 8 9 2 1904 7607 Screw M2x2 5 E01420 025 2 X 5 1 1904 7608 Head NC09701 05 1 A 5 2 1904 7609 Ribbon mask NC14102 05 1 A 5 3 1904 7610 Spring for head return NC13601 01 1 B 5 4 1904 7611 Pin for shaft NC12001 02 1 X 5 5 1904 7612 Shaft for carrige guide NC02001 03 2 X 6 1 1904 7613 Shaft for pressure roller NC22003 01 1 X 6 10 1...

Page 30: ...36 Gear for PF drive NC20209 01 1 B 11 5 1904 7637 Gear for idler NC20210 00 1 B 11 6 1906 2087 E Ring 2 E60320 00 1 X 12 1 1904 7638 Gear A for knob NC20205 01 1 B 12 2 1904 7639 Gear B for knob NC20206 03 1 B 12 3 1904 7640 Knob NC20901 05 1 B 12 4 1904 7641 Screw M1 4x3 5 E12714 035 1 X 27 ...

Page 31: ... 7 6 9 6 4 6 11 7 5 6 7 6 10 6 8 6 3 12 1 7 1 7 2 7 3 7 4 12 3 12 2 6 1 12 4 11 7 11 4 11 6 11 3 11 2 11 5 3 5 3 1 3 4 11 1 3 2 3 3 2 5 2 6 2 6 2 7 2 8 2 10 2 9 2 7 4 7 4 8 4 6 4 5 4 3 4 2 4 1 8 1 2 4 2 3 5 4 5 4 5 1 2 2 4 4 2 1 9 2 9 1 3 7 3 9 3 8 5 2 3 6 1 1 ...

Page 32: ......

Page 33: ...MA0201571A ...

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