US3866533A - Electrical print impression control - Google Patents
Electrical print impression control Download PDFInfo
- Publication number
- US3866533A US3866533A US318309A US31830972A US3866533A US 3866533 A US3866533 A US 3866533A US 318309 A US318309 A US 318309A US 31830972 A US31830972 A US 31830972A US 3866533 A US3866533 A US 3866533A
- Authority
- US
- United States
- Prior art keywords
- pulse
- voltage
- delay
- latch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
- B41J1/20—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on endless bands or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J9/00—Hammer-impression mechanisms
- B41J9/44—Control for hammer-impression mechanisms
- B41J9/48—Control for hammer-impression mechanisms for deciding or adjusting hammer-drive energy
Definitions
- ABSTRACT Impression control for an impact printer is provided by changing the width of the pulse applied to the print hammers in accordance with the thickness of the forms on which printing is being performedand in accordance with the voltage of the source energizing the print hammers, so as to maintain a constant impact force to provide uniform print density for different forms thicknesses. Misregistration of characters caused by a variation in the rate of movement of the print hammer is compensated for by changing the start time of the pulse energizing the hammer.
- FIG. 2 PULSE 0 MA WIDTH V A SEC A o 1200- v ⁇ o V L- ⁇ QH V 1000 I SOURCE'VOLTS I PATENTEDFEBI 81915 2.866.533
- Another object of the invention is to provide for varying the print hammer impact energy by modifying the width of the pulse driving the print hammer.
- Yet another object of the invention is to provide for compensating for differences in flight time caused by varying pulse width, by varying the start time of the modified pulse driving the print hammer.
- Yet another important object of the invention is to maintain the impact force and impact time of a print hammer with varying forms thicknesses and varying source voltage.
- FIG. 1 is a schematic block diagram of a printer control system embodying the invention in one of its forms.
- FIG. 2 shows a set of curves illustrating the variation in pulse width with varying forms thicknesses to maintain a 21 lb. impact force.
- FIG. 3 shows a set of curves illustrating the relations between the pulse width, flight time and source voltage for different forms thicknesses.
- FIG. 4 is a schematic block diagram of the impression control portion of the system of FIG. 3.
- FIG. 5 is a schematic circuit diagram of the forms thickness potentiometer and analog function mixer of FIG. 4.
- FIG. 6 is a schematic circuit diagram of an inverting amplifier used in the analog function mixer and amplitier of FIG. 4.
- FIG. 7 is a circuit diagram of a divider and vernier adjustment used in the analog function amplifier and mixer of FIG. 4.
- FIG. 8 is a schematic circuit diagram of a pulse width generator used in the circuit of FIG. 4.
- FIG. 9 is a schematic circuit diagram of a pulse width delay generator which is a non-linear function of the source voltage in FIG. 4 and FIG. 10 is a pulse width delay generator that is a nonlinear function of the forms thickness voltage in FIG. 4.
- the reference numeral 10 denotes generally high-speed printer apparatus of the type described in U.S. Pat. No. 2,993,437 which issued to F. M. Demer et al. on July 25. I96] and has been modified for use with the present invention.
- a type cartridge 11 comprising an endless band l2 having a plurality of type characters 13 thereon is mounted between spacedapart wheels 14 and 15 for movement past a plurality of print positions along a print line on a document or form 22 upon which a printing operation is to be performed.
- a plurality of print hammers 20 are positioned one in each position along the print line for impacting the document 22 and a ribbon 24 against selected type characters 13 as they pass the different print positions.
- Timing marks 16 are provided on the band 12 which are scanned by a transducer 18 and used for producing timing signals for use in the control system.
- Information to be printed is stored in a print line buffer 26 which is scanned by the usual X drivers 28 and Y drivers 30 under the control of an X ring 32 and a Y ring 34 as described in the Demer et al. patent.
- a subcycle gating ring 34 is provided so that the print positions are scanned in a predetermined spaced order as described in the Demer et al. patent.
- stages 2, 3 and l of the subcycle gating ring may be used with the stages being used shifted one position to gate a pulse control system 40 for controlling the actual firing of selected ones of the print hammers 20 simultaneously for each subcycle, on the following subcycle.
- the hammer select circuit 175 is used to set select ones of a plurality of latches 36 which are connected through AND circuit 38 to the different print hammers 20.
- the AND circuits 38 are gated in subcycle groups by the pulse control circuit 40 under the control of the subcycle gating ring 34 for actually firing the print hammers 20 which are selected during the previous subcycle.
- the type cartridge 11 is shown by the arrows as schematically movable toward and away from the print hammers 20 for accommodating different thicknesses of the forms 22.
- a potentiometer 42 is provided which is operatively connected to the cartridge mechanism so as to be operated when the cartridge is moved closer to or further away from the type hammers 20.
- FIG. 2 shows the width of pulses applied to the print hammer magnets required to hold the print force constant at 2] lbs. for l, 3 and 6 part forms at different values of voltage from the source applied to the print hammers 20.
- These conditions relate to print hammers having electromagnetic actuating means whose magnet cores do not saturate during the time that the drive pulse is applied. This condition allows a considerable range of control of the print hammer during the time it is energized, thus altering its output or operating characteristics.
- the main embodiment is the provision of a correct hammer kenetic energy to the paper forms to maintain essentially constant print density over the intended range of forms thicknesses.
- FIG. 3 shows graphically what the circuit must accomplish.
- the pulse width curves F1, F3 and F6 are smoothed data representations of the curves shown in FIG. 2 and the F3.5 curve is calculated from the F1, F3 and F6 relationships: it represents the mid range for the forms control. Subscripts denote the relative number of forms. In reality the forms control is calibrated in thousandths of an inch and is continuously variable such that the pulse width generator circuitry of the pulse control system 40 must produce a pulse width representative of any point within the area A, B, C, D.
- the pulse width function area A, B, C, D shows that for a particular forms thickness (any F curve) the required pulse width is a non-linear inverse function of the print hammer supply voltage. It also shows that (l) for any particular voltage the pulse width is a positive linear function of forms thickness but that 2) the discrete range of widths is an inverse function of the particular voltage.
- the flight time (FLTM) curves F1, F3 and F6 show the time between print hammer energization and hammer impact. (FLTM) is observed to be a non-linear function with respect to voltage and forms thickness in all respects.
- impact time be held constant relative to the type characters 13 of FIG. 1 to prevent printing misregistration; see the IMPACT TIME line. Since actual flight times under any set of conditions is described by the area A, E, G and H, the start of the pulse width generator circuit must be delayed by the amount from any point within the area up to the IMPACT TIME so that the registration will be held constant.
- FIG. 4 shows a block diagram of the pulse control circuit 40 of FIG. 1 for delaying and controlling the width of the pulses used to fire the print hammers 20.
- a typical latch 44 is set by a pulse from the transducer 18 of FIG. 1 and a delay generator 46 is gated on by the latch 44 and its duration is a non-linear function of the 24 volt print hammer power supply.
- a delay generator 48 is reset.
- delay generator 48 is gated on and its duration is a non'linear function of forms thickness as determined by the setting of the potentiometer 42.
- an output pulse causes the latch 44 to be reset and the delay printer cycle is complete and dormant until the next synchronization pulse is received from the transducer 18.
- the delay generator 48 When the delay generator 48 turns off it also turns on one of three AND circuits 50, 52 and 54 which are gated by signals from the subcycle gating ring 34 to start the hammer fire pulses. For example if AND 50 is turned on, it turns on a pulse width latch 56, AND 52 likewise controls a pulse width latch 58, and AND 54 controls a pulse width latch 60.
- These latches provide energizing signals of controlled widths for their respective subcycle groups of print hammers l, 4, 7 etc., 2, 5, 8 etc. or 3, 6, 9 etc. depending on which of the groups of latches 36 had been set.
- the latch 56 When the latch 56 turns on, it starts a pulse width generator 62 which determines the width and hence duration of the pulse applied to print hammers 1, 4, 7, etc., and the latches 58 and 60 start corresponding pulse width generators 64 and 66; the duration of pulse width generators 62, 64 and 66 is dependent upon two independent variables and is non-linear with respect to each.
- the pulse width generators 62, 64 and 66 are controlled by an analog function mixer and amplifier circuit 68 which is responsive to the voltage of the 24 volt source and also to the setting of the potentiometer 42.
- the pulse width generator 62 turns off, the latch 56 is reset and the pulse applied to the print hammers 1, 4, 7, etc. is terminated.
- subscan pulses ll, 2 and 3 are used in sequence to scan the print line buffer 26 while subscan pulses 2, 3, and I are utilized in that order to control the firing of the respective groups of print hammers I, 4, 7; 2, 5, 8, and 3, 6, 9, etc.
- the forms thickness sensing potentiometer 42 is shown as connected to the base and collector of a transistor T1 which with an emitter resistor 70 comprises a common collector amplifier to buffer the potentiometer 42, and it drives each pulse width generator 62, 64 and 66 via terminals 18a, 18b and 180.
- the forms sense voltage from the potentiometer 42 appears at mixer point A of the mixer 68 with less than unity gain while the magnet supply voltage +V and its variations appear there amplified and in phase through the common base amplifier consisting of resistor 72 transistor T2 and the parallel resistors 73, 74 and 75.
- Transistor T3 and resistor 76 form a common collector amplifier to buffer point A and provide drive to terminals 24a, 24b and 240.
- FIG. 6 shows an inverting amplifier comprising transistor T4 which provides a +V correction current to each pulse width generator via terminals 25a, 25b and 250 such that the detector is not a function of the generator capacitor charging current.
- the load for this amplifier is the collective input impedances of the driven circuits.
- Capacitors C1 and C2 in FIGS. 5, and 6 respectively limit the circuit band width to prevent pulse width generator variations for rapid excursions of the print hammer supply voltage. Rapid variations of the supply voltage do not cause appreciable reactions in the print hammer circuit because of magnetic and mechanical integration.
- P2 and P3 form a divider and vernier adjustment so that each of the pulse width generators may be set to the same time duration. These generators must track over a relatively wide range or they will inject print registration variations; print density would vary also but it would be relatively small. Terminals 28a, 28b and 280 feed the adjustable bias voltage to the individual pulse width generators.
- FIG. 8 shows a pulse width generator, for example, the pulse width generator 62 of FIG. 4, each of the generators 62, 64 and 66 being identical.
- the adjusted bias voltage at terminal 280 establishes the level of current in the wire B (and thus the current through transistor T9). Its magnitude is the difference between the currents in resistors 80 and 81 which are functions of +V and the forms thickness respectively.
- the current at B is transmitted to a current in wire D which is less than the current in B because the transistors alphas are less than unity.
- the voltage at point E is related to the voltage at point J which is a composite function of the voltage +V and of the forms thickness.
- Terminal 29a goes positive and transistor T5 turns on. Point G is forced to zero volts and current in D is again diverted through transistor T5 and capacitor C3 is discharged.
- Transistor T6 is wired as a clamp diode to protect transistor T7 and to reduce the circuit restoration time by allowing a high discharge current to flow through capacitor C3 and the transistors T5 and T6. When transistor T6 is no longer forward biased the remainder of the discharge current is supplied through diode 83 and resistor 85.
- the time required for transistor T10 to saturate is a complex function of l) the rate at which capacitor C3 charges as controlled by current at D, which is a nonlinear function of the two independent variables, and
- FIG. 9 shows a pulse width delay generator that is a function of a print hammer voltage V and corresponds to delay generator number 46 of FIG. 4.
- the dash-enclosed portion 88 performs for this delay generator the same function that the circuit of FIG. performs for the delay generator in FIG. 8.
- the generator 46 is gatedon at terminal 89 by the delay fire latch 44 of FIG. 1 and its output at terminal 90 is used to control the next generator '48 of FIG. 4.
- the analysis and operation of this generator are identical in principle to those described for the generator 62 of FIG. 8.
- FIG. shows a pulse width delay generator 48 of FIG. 4 that is a function of the forms thickness voltage F from potentiometer 12 of FIG. 4.
- the dash-enclosed portion 92 of the circuit performs for this generator the same function that the circuit of FIG. 6 performs for the circuit of FIGS. 8 and FIG. 9.
- the forms control voltage is used directly at terminal 18m. This generator is reset when terminal 90 is positive and the voltage function generator in FIG. 9 is on.
- the cumulative delays of the circuits of FIGS. 9 and 10 effectively cause any point within the area AEGI-I in FIG. 3 to be delayed so that any print hammer will cause printing to occur at the same time relative to the synchronizing pulse that relates electrical timing back to a mechanical position of the type characters.
- the voltage and forms delay generators insert fixed minimum delays of 50 and 57.5 microseconds, respectively, so that the common impact time is 107.5 microseconds later than shown in FIG. 3.
- the voltage delay generator 46 provides the function necessary to move the curve EJG up to the Impact Time Line.
- the forms delay generator 48 provides the function necessary to move any curve that parallels EJG up to coincidence with curve EJG. This delay characteristic is represented by curve JKL (as it would appear when plotted against a linear forms thickness scale).
- the print line buffer 26 of FIG. 1 is scanned by the X drivers and Y drivers under the control of the subcycle gating ring 34 to provide 3 subscans of all possible print positions.
- the hammer select circuit 175 sets the different hammer latches 36 in response to a compare between a character contained in the print line buffer for a given print position and the character on the type chain 12 in that position.
- the pulse control circuit 40 operates to gate the output of the selected latches 36 through the ANDS 38 to fire the selected print hammers 20.
- the pulse duration of the gating pulses applied to the ANDS 38 by the pulse control circuit 40 will be a function of the pulse width generator outputs and the delay of the pulses will be a function of the delay generators 46 and 48 in response to the source voltage and forms thickness respectively.
- a new novel printer control circuit is provided utilizing a pulse control circuit which controls the timing and the duration of the pulses applied to the print hammers to not only maintain a constant print force but to also provide good registration regardless of the number of forms (up to six) or of variations in the source voltage.
- circuit means connected to effect selective energization of said print hammer electromagnetic actuating means from said source of electrical energy in accordance with the presence of particular type characters at each of said print positions, and
- control means including means responsive to at least one of the variable operating conditions comprising variation of the voltage of the source and variation in forms thickness which affect the print hammer impact force connected to said circuit means and to said print hammer electromagnetic actuating means to selectively apply energizing pulses of variable width and hence duration to said print hammer electromagnetic actuating means in accordance with said variable operating conditions to correct for changes in print impact force caused by said variable operating conditions so as to provide a substantially constant print hammer print impact force.
- control means operating to dynamically vary the width and duration of the energizing pulses of said print hammers and effect a variable delay in the time of initiating said energizing pulses.
- control means being operable to vary the delay in initiating said energizing pulses of said print hammer in the same sense as a variation in voltage of the source of energization and vary the width and hence duration of the energizing pulses in the opposite sense.
- control means being operable to reduce the width and hence duration of the energizing pulse of said print hammers with a reduction in the thickness of the forms on which printing is being done and reduce the delay in initiating said energizing pulse to provide a substantially constant impact time.
- circuit means including a plurality of latches which are selectively set in accordance with the particular print hammers to be fired, and said control means being connected to gate means connected between said latches and said print hammers.
- control means including a pulse width latch, connected to said gate means and a pulse width generator selectively producing pulse of variable width and hence duration responsive to but in non-linear relation with respect to source voltage and forms thickness connected to said pulse width latch to reset said pulse width latch at different times in a non-linear relation to said source voltage and forms thickness, so as to determine the duration of the energization of said print hammer electromagnetic actuating means by a pulse from said pulse width latch.
- control means including a fire delay latch connected by gate means to said pulse width latch and controlled by a delay generator which is non-linear with respect to source voltage and a delay generator which is non-linear with respect to forms thickness connected in cascade with said fire delay latch to reset said fire delay latch.
- circuit means including a subcycle gating ring connected to said control means to effect selective energization of said latches in groups in a predetermined order, and said subcycle gating ring being also connected to said control means in a different order so as to gate said latches on the following subcycle in which they are selected.
Landscapes
- Impact Printers (AREA)
- Dot-Matrix Printers And Others (AREA)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US318309A US3866533A (en) | 1972-12-26 | 1972-12-26 | Electrical print impression control |
IT31276/73A IT999367B (it) | 1972-12-26 | 1973-11-14 | Stampatrice ad alta velocita perfezionata |
GB5305073A GB1421474A (en) | 1972-12-26 | 1973-11-15 | Printer control system |
CA186,054A CA997208A (en) | 1972-12-26 | 1973-11-16 | Electrical print impression control |
FR7342435A FR2211880A5 (ja) | 1972-12-26 | 1973-11-20 | |
JP12982873A JPS5318367B2 (ja) | 1972-12-26 | 1973-11-20 | |
DE2360323A DE2360323C2 (de) | 1972-12-26 | 1973-12-04 | Schaltungsanordnung zur Steuerung der Anschlagstärke in Druckern |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US318309A US3866533A (en) | 1972-12-26 | 1972-12-26 | Electrical print impression control |
Publications (1)
Publication Number | Publication Date |
---|---|
US3866533A true US3866533A (en) | 1975-02-18 |
Family
ID=23237618
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US318309A Expired - Lifetime US3866533A (en) | 1972-12-26 | 1972-12-26 | Electrical print impression control |
Country Status (7)
Country | Link |
---|---|
US (1) | US3866533A (ja) |
JP (1) | JPS5318367B2 (ja) |
CA (1) | CA997208A (ja) |
DE (1) | DE2360323C2 (ja) |
FR (1) | FR2211880A5 (ja) |
GB (1) | GB1421474A (ja) |
IT (1) | IT999367B (ja) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4027761A (en) * | 1975-10-21 | 1977-06-07 | Ncr Corporation | Matrix print head impact energy control |
DE2726785A1 (de) * | 1976-06-14 | 1977-12-15 | Ricoh Kk | Schnelldrucker |
US4083299A (en) * | 1977-01-24 | 1978-04-11 | C. Itoh Electronics, Inc. | Electromagnetic striking members selectively actuated in time from alternating current power |
US4162131A (en) * | 1977-11-02 | 1979-07-24 | General Electric Company | Drive circuit for printing head |
DE2923640A1 (de) * | 1978-06-12 | 1979-12-13 | Fujitsu Ltd | Schnelldruckersystem |
US4255775A (en) * | 1979-05-29 | 1981-03-10 | Research Cottrell, Inc. | Electrostatic precipitator rapper control system with enhanced accuracy |
US4286516A (en) * | 1979-10-15 | 1981-09-01 | Burroughs Corporation | Electronic control for timing hammers in impact printers |
US4293888A (en) * | 1979-06-25 | 1981-10-06 | International Business Machines Corporation | Print hammer drive circuit with compensation for voltage variation |
US4348119A (en) * | 1980-11-06 | 1982-09-07 | General Electric Company | Bounce control system for moving coil printing element |
US4665371A (en) * | 1983-10-27 | 1987-05-12 | Ncr Corporation | Character spacing circuit for controlling print hammer firing |
US4683817A (en) * | 1986-05-20 | 1987-08-04 | Ncr Corporation | Dot matrix print head energy control circuit |
US4690575A (en) * | 1982-02-17 | 1987-09-01 | Canon Kabushiki Kaisha | Device for controlling printing pressure according to the kind of ink ribbon being used |
US4740094A (en) * | 1982-12-27 | 1988-04-26 | Canon Kabushiki Kaisha | Print pressure control device |
GB2211792A (en) * | 1987-10-30 | 1989-07-12 | Brother Ind Ltd | Dot-matrix impact printer using piezoelectric elements for activating print wires |
US5046413A (en) * | 1990-10-05 | 1991-09-10 | International Business Machines Corp. | Method and apparatus for band printing with automatic home compensation |
US5204802A (en) * | 1988-11-23 | 1993-04-20 | Datacard Corporation | Method and apparatus for driving and controlling an improved solenoid impact printer |
US5263994A (en) * | 1991-04-09 | 1993-11-23 | Brother Kogyo Kabushiki Kaisha | Printer having a plurality of printing modes |
US6616357B2 (en) * | 2000-05-17 | 2003-09-09 | Nec Corporation | Dot line printer |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3834306A (en) * | 1973-03-26 | 1974-09-10 | Ibm | Print density control |
NL7603373A (nl) * | 1976-04-01 | 1977-10-04 | Philips Nv | Drukinrichting. |
JPS5347070U (ja) * | 1976-09-24 | 1978-04-21 | ||
JPS5344123A (en) * | 1976-10-02 | 1978-04-20 | Ricoh Co Ltd | Printing pressure control method of printer |
JPS54114323A (en) * | 1978-02-23 | 1979-09-06 | Canon Kk | Printer |
DE2848786C3 (de) * | 1978-11-10 | 1981-05-21 | Ibm Deutschland Gmbh, 7000 Stuttgart | Schaltungsanordnung für die Synchronisierung der Auftrittszeitpunkte von Druckhammeraufschlag mit dem Eintreffen der Drucktype an der Druckstelle |
US4280404A (en) * | 1979-10-03 | 1981-07-28 | Printronix, Inc. | Printer having variable hammer release drive |
US4327639A (en) * | 1979-11-05 | 1982-05-04 | Xerox Corporation | Print hammer assembly with multi-location impacts |
US4324497A (en) * | 1979-11-05 | 1982-04-13 | Xerox Corporation | Print hammer assembly with amplified multi-location impacts |
US4407193A (en) * | 1980-06-16 | 1983-10-04 | International Business Machines Corporation | Solenoid impact print hammer with uniform free flight time |
JPS57109678A (en) * | 1980-12-27 | 1982-07-08 | Ricoh Co Ltd | Plunger type printing hammer |
JPS58197063A (ja) * | 1982-05-13 | 1983-11-16 | Toshiba Corp | 印字ヘッド駆動方式 |
JPS62242561A (ja) * | 1986-04-08 | 1987-10-23 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | 多重アクチユエ−タ |
US4743821A (en) * | 1986-10-14 | 1988-05-10 | International Business Machines Corporation | Pulse-width-modulating feedback control of electromagnetic actuators |
US5087135A (en) * | 1988-04-14 | 1992-02-11 | Dataproducts Corporation | Printer paper thickness detector |
US7280242B2 (en) | 2002-07-09 | 2007-10-09 | Hewlett-Packard Development Company, L.P. | Printer control based on media attributes |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3172353A (en) * | 1963-06-17 | 1965-03-09 | Data Products Corp | Variable force hammer high speed printer |
US3183830A (en) * | 1960-12-27 | 1965-05-18 | Rca Corp | Print registration control means in high speed printers |
US3443514A (en) * | 1967-05-17 | 1969-05-13 | Potter Instrument Co Inc | Print hammer timing and energizing means in high speed printers |
US3513774A (en) * | 1968-07-01 | 1970-05-26 | Ibm | Printer hammer compensation |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1499415A (fr) * | 1966-09-15 | 1967-10-27 | Bull General Electric | Perfectionnements aux dispositifs de commande d'impression en fonction de l'épaisseur totale des supports d'impressions |
-
1972
- 1972-12-26 US US318309A patent/US3866533A/en not_active Expired - Lifetime
-
1973
- 1973-11-14 IT IT31276/73A patent/IT999367B/it active
- 1973-11-15 GB GB5305073A patent/GB1421474A/en not_active Expired
- 1973-11-16 CA CA186,054A patent/CA997208A/en not_active Expired
- 1973-11-20 JP JP12982873A patent/JPS5318367B2/ja not_active Expired
- 1973-11-20 FR FR7342435A patent/FR2211880A5/fr not_active Expired
- 1973-12-04 DE DE2360323A patent/DE2360323C2/de not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3183830A (en) * | 1960-12-27 | 1965-05-18 | Rca Corp | Print registration control means in high speed printers |
US3172353A (en) * | 1963-06-17 | 1965-03-09 | Data Products Corp | Variable force hammer high speed printer |
US3443514A (en) * | 1967-05-17 | 1969-05-13 | Potter Instrument Co Inc | Print hammer timing and energizing means in high speed printers |
US3513774A (en) * | 1968-07-01 | 1970-05-26 | Ibm | Printer hammer compensation |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4027761A (en) * | 1975-10-21 | 1977-06-07 | Ncr Corporation | Matrix print head impact energy control |
DE2726785A1 (de) * | 1976-06-14 | 1977-12-15 | Ricoh Kk | Schnelldrucker |
US4083299A (en) * | 1977-01-24 | 1978-04-11 | C. Itoh Electronics, Inc. | Electromagnetic striking members selectively actuated in time from alternating current power |
US4162131A (en) * | 1977-11-02 | 1979-07-24 | General Electric Company | Drive circuit for printing head |
DE2923640A1 (de) * | 1978-06-12 | 1979-12-13 | Fujitsu Ltd | Schnelldruckersystem |
US4302117A (en) * | 1978-06-12 | 1981-11-24 | Fujitsu Limited | High speed variable intensity printing system |
US4255775A (en) * | 1979-05-29 | 1981-03-10 | Research Cottrell, Inc. | Electrostatic precipitator rapper control system with enhanced accuracy |
US4293888A (en) * | 1979-06-25 | 1981-10-06 | International Business Machines Corporation | Print hammer drive circuit with compensation for voltage variation |
US4286516A (en) * | 1979-10-15 | 1981-09-01 | Burroughs Corporation | Electronic control for timing hammers in impact printers |
US4348119A (en) * | 1980-11-06 | 1982-09-07 | General Electric Company | Bounce control system for moving coil printing element |
US4690575A (en) * | 1982-02-17 | 1987-09-01 | Canon Kabushiki Kaisha | Device for controlling printing pressure according to the kind of ink ribbon being used |
US4740094A (en) * | 1982-12-27 | 1988-04-26 | Canon Kabushiki Kaisha | Print pressure control device |
US4665371A (en) * | 1983-10-27 | 1987-05-12 | Ncr Corporation | Character spacing circuit for controlling print hammer firing |
WO1987007219A1 (en) * | 1986-05-20 | 1987-12-03 | Ncr Corporation | Printer energy control circuit |
US4683817A (en) * | 1986-05-20 | 1987-08-04 | Ncr Corporation | Dot matrix print head energy control circuit |
GB2211792A (en) * | 1987-10-30 | 1989-07-12 | Brother Ind Ltd | Dot-matrix impact printer using piezoelectric elements for activating print wires |
US5037217A (en) * | 1987-10-30 | 1991-08-06 | Brother Kogyo Kabushiki Kaisha | Dot-matrix impact printer using piezoelectric elements for activating print wires |
GB2211792B (en) * | 1987-10-30 | 1992-04-01 | Brother Ind Ltd | Dot matrix impact printer using piezoelectric elements for activating print wires |
US5204802A (en) * | 1988-11-23 | 1993-04-20 | Datacard Corporation | Method and apparatus for driving and controlling an improved solenoid impact printer |
US5453821A (en) * | 1988-11-23 | 1995-09-26 | Datacard Corporation | Apparatus for driving and controlling solenoid impact imprinter |
US5046413A (en) * | 1990-10-05 | 1991-09-10 | International Business Machines Corp. | Method and apparatus for band printing with automatic home compensation |
US5263994A (en) * | 1991-04-09 | 1993-11-23 | Brother Kogyo Kabushiki Kaisha | Printer having a plurality of printing modes |
US6616357B2 (en) * | 2000-05-17 | 2003-09-09 | Nec Corporation | Dot line printer |
Also Published As
Publication number | Publication date |
---|---|
IT999367B (it) | 1976-02-20 |
DE2360323C2 (de) | 1982-03-04 |
JPS4991725A (ja) | 1974-09-02 |
DE2360323A1 (de) | 1974-07-04 |
JPS5318367B2 (ja) | 1978-06-14 |
FR2211880A5 (ja) | 1974-07-19 |
CA997208A (en) | 1976-09-21 |
GB1421474A (en) | 1976-01-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3866533A (en) | Electrical print impression control | |
US4293888A (en) | Print hammer drive circuit with compensation for voltage variation | |
US4727235A (en) | Method and apparatus for equalizing power output in a laser marking system | |
CA1292286C (en) | Method and apparatus for equalizing power output in a laser marking system | |
US3416442A (en) | Selective hammer actuating means in chain printers | |
US3656427A (en) | Print control system for high speed printers | |
JPH0241424B2 (ja) | ||
US3872788A (en) | Hammer flight time aligning system for impact printers | |
US4210404A (en) | Printhead compensation arrangement for printer | |
US3507213A (en) | High speed flying hammer solenoid systems | |
US4169991A (en) | Variable print speed control | |
US5198833A (en) | Variable density ink-jet dot printer | |
US4119383A (en) | Method and apparatus for inserting intermediate dots in a dot matrix using a dot printer | |
US3513774A (en) | Printer hammer compensation | |
US3834306A (en) | Print density control | |
US4020939A (en) | Matrix print head repetition rate control | |
US3732573A (en) | Electrographic printer matrix circuit | |
US3463081A (en) | Electrical high speed printer | |
US3374402A (en) | Data printing apparatus | |
US4015145A (en) | Voltage compensated timing circuit | |
US3628100A (en) | Hammer driving circuits for high-speed printers | |
US5028157A (en) | Printer having an erasing mechanism | |
US3211087A (en) | Hammer control circuit in a high speed printer | |
JPS6223671B2 (ja) | ||
US3700807A (en) | Impactless printer |