US3842736A - Print hammer registration control - Google Patents

Print hammer registration control Download PDF

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Publication number
US3842736A
US3842736A US00338133A US33813373A US3842736A US 3842736 A US3842736 A US 3842736A US 00338133 A US00338133 A US 00338133A US 33813373 A US33813373 A US 33813373A US 3842736 A US3842736 A US 3842736A
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US
United States
Prior art keywords
print
motor
source
voltage
type
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
Application number
US00338133A
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English (en)
Inventor
R Gilbert
M Hryck
J Mako
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US00338133A priority Critical patent/US3842736A/en
Priority to IT19659/74A priority patent/IT1003480B/it
Priority to DE2404799A priority patent/DE2404799C2/de
Priority to JP1687474A priority patent/JPS5340421B2/ja
Priority to FR7405831A priority patent/FR2220385B1/fr
Priority to GB690274A priority patent/GB1435846A/en
Priority to CA193,590A priority patent/CA981588A/en
Application granted granted Critical
Publication of US3842736A publication Critical patent/US3842736A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism

Definitions

  • BELT SPEED vs. VOLTAGE 7/8 -KIV BELT SPEED, 80 L /o IN/SEC.
  • L/B v 200 I o I90 o I I Q I I80 IMPACT VELOCITY I L70 I I 2800 160 FLIGHT TIME I I 2000 I50 I I 2400
  • the reference numeral 10 denotes The invention relates generally to high speed impact 5 generally a Portion of a Printer mechanism wherein an printers and it has reference in particular to printers having electromagnetically operated print hammers and a motor driven type character train or chain.
  • this invention provides for controlling the speed of a type carrier in a high speed printer to compensate for changes in flight time of the prin hammers with changes in source voltage.
  • Another object of the invention is to provide for driving a type chain/train by means of a stepping motor and for varying the frequency of the pulses applied to the stepping motor in accordance with variations in the source voltage.
  • Yet another object of the invention is to provide for compensating for the effects of source voltage variations on the flight time of a print hammer in a simple and effective manner.
  • FIG. I is a partial schematic drawing of a high speed printer embodying the invention in one of its forms
  • FIG. 2 is a slightly enlarged side elevational view of a print hammer of FIG. 1;
  • FIG. 3 is a schematic circuit diagram of the motor control circuit of FIG. 1; 7
  • FIG. 4 shows a curve illustrating the relation between source voltage and type carrier speed according to the invention.
  • FIG. 5 shows curves illustrating the relations between the input power to the print hammer and hammer flight time and impact velocity respectively.
  • the endless type belt 12 is supported on spaced pulleys, of which only one pulley 14 is shown, for moving a plurality of type characters 16 positioned on upstanding fingers 18 on the type belt 12 past a number of print positions along a print line on a document not shown.
  • the type belt 12 contains a plurality of timing marks 20 which are spaced in predetermined relation to the type characters 16 and are sensed by a transducer 21 for controlling the operation of a plurality of print hammers represented by the print hammer 22.
  • the hammer 22 has an operating winding 23 which is energized in timed relation with movement of the type belt 12 through print control means 24 energized from a source of electrical energy over conductors 28.
  • the type belt 12 is operated by means .of a motor 30 which is connected in driving relation with the pulley l4 and is energized through a motor control circuit 32 also connected to the source through conductors 28.
  • the motor 30 may comprise a stepping motor which is operated by means of pulses applied to the operating windings thereof.
  • the stepping motor 30 may be of the type described in the article entitled Characteristics of a Synchronous Conductor Motor by Arthur E. Snowdon and Elmer W. Madsen, published in Applications and Industry, March, 1962 after being the subject of paper 61-650 recommended by the AIEE Industrial Control Committee and approved by the AIEE Technical Operations Department for presentation at the AIEE Northeastern District Meeting, Hartford, Conn. May 17-19, 1961.
  • Such a motor has a speed proportional to the rate at which pulses are appliedto it, and is normally substantially unaffected by variations in the value of the source voltage.
  • the print hammer 22 may comprise an armature 34 pivotally supported by a pivot 35 an having an upstanding extension 36 with a hammer face 38 at the upper end for impacting the type characters 16.
  • a substantially u-shaped magnet core 40 is provided having the operating winding 23 mounted on the lower leg which terminates within the winding so that a hooked end portion 42 of the armature 34 projects into the winding.
  • the motor control circuit 32 comprises a pair of triggers 42A and 42B connected to operate as a binary counter in response to input pulses from an oscillator 44.
  • the outputs of the triggers 42A and 42B are connected to AND circuits 46A, 46A, 46B and 46B which are connected to the terminals A, A, B and E of the motor 30 respectively.
  • the oscillator 44 may be of any suitable type comprising for example a well-known relaxation oscillator which includes in its circuit a capacitor 48 which is charged and discharged to provide the oscillator function and determine the frequency of oscillation.
  • the capacitor 48 may be charged from a current source represented by-a transistor 50 which is connected to a source of direct current through conductors 28, fixed resistors R15 and R18, and variable resistor R17, which may be adjusted to vary the charging rate of the capacitor 48.
  • Resistor R16 and capacitor C16 provide a stabilizing filter.
  • the base of the transistor 50 is connected to the source through a bias network including diodes D2, D10, and D11 and resistor R19.
  • a resistor R20 is connected in shunt with the diodes, and this circuit provides the base drive for the transistor 50.
  • a ramp generator 52 including a capacitor 53 is connected to the base of 'the transistor 50 through a resistor R21, for initially biasing the transistor 50 off, and permitting it to gradually conduct so that a delay is prosite occurs. Accordingly the speed of the stepping vided during which themotor 30 may pick up to its running speed.
  • the ramp generator 52 is turned on by application of a Belt Run signal at terminal 54.
  • a Belt Gate signal is applied to the AND circuits 46A, 46A, 46B and 4613, for controlling the operation of the motor 30 independently of the oscillator 44.
  • V B be such that SS /8V, is within acceptable limits over a range of voltage.
  • V t K VK IV K, K where K, and K are constants.
  • the subject invention relates to a stepper motor belt drive scheme that provides automatic compensation for power supply voltage variations that affect print registration.
  • the print hammer 22 uses a work type magnet.
  • One of the properties of such a hammer is its high sensitivity to input power.
  • Curves a and b of FIG. show how flight time changes'when the input power is varied and how the impact velocity varies with input power. Variations in the supply voltage also cause an undesired variation in the flight time resulting in print misregistration. 1
  • the type belt 12 is driven by a stepping motor 30 whose velocity is dependent on the stepping rate, which in turn is controlled by a voltage sensitive oscillator 44 thus giving velocity proportional to voltage.
  • the base of the transistor 50 When the circuit 32 is first activated the base of the transistor 50 is held at a positive value by the ramp generator 52, blocking its conductivity. As the voltage of the ramp generator decays the transistor 50 is gradually turned over to the control of its base biasing circuit including the diodes D2, D and D11. The transistor 50 acts as a current source and the capacitor 48 is gradually charged and then discharged under the control of the relaxation oscillator 44. The charging rate of the capacitor 48 is determined by the diode resistor network in the base and emitter of the transistor 50. If the supply voltage increases the transistor 50 will be turned on harder by the'diode network. This will result in a faster charge and a higher frequency of oscillation of the oscillator 44.
  • the oppomotor 30 is controlled in accordance with the value of the source voltage to which the conductors 28 are connected.
  • the speed of the motor 30 is reduced so that the type character belt 12 moves at a slower rate, and proper registration of the print hammer 22 with the type characters 16 on the type belt is maintained.
  • the improvement which comprises connecting a pulse operated motor whose speed varies with the frequency of the applied pulses to drive said type carrier, and connecting a voltage responsive variable frequency device whose frequency varies with the applied voltage to be energized from said source to generate pulses and connecting said device to said motor to thereby vary the speed of said motor for driving said motor, whereby changes in the flight time of said electromagnetically operated print hammer means with variations in source voltage are compensated for by corresponding changes in the speed of said type carrier so as to maintain proper registration under varying source voltage conditions between said print hammer means and type characters when impacting said document and selected type characters to print.
  • the invention as defined in claim 2 characterized by a transistor connected to said source and to said oscillator to control the charging rate and hence frequency of a capacitor which determines the frequency of said relaxation oscillator.

Landscapes

  • Impact Printers (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
US00338133A 1973-03-05 1973-03-05 Print hammer registration control Expired - Lifetime US3842736A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00338133A US3842736A (en) 1973-03-05 1973-03-05 Print hammer registration control
IT19659/74A IT1003480B (it) 1973-03-05 1974-01-23 Controllo perfezionato per la regi strazione dei martelletti in stampa trici ad impatto operanti ad alta velocita
DE2404799A DE2404799C2 (de) 1973-03-05 1974-02-01 Steuerschaltung für die Ausrichtung von Druckhämmern in Schnelldruckern
JP1687474A JPS5340421B2 (fr) 1973-03-05 1974-02-13
FR7405831A FR2220385B1 (fr) 1973-03-05 1974-02-13
GB690274A GB1435846A (en) 1973-03-05 1974-02-15 Selective printer
CA193,590A CA981588A (en) 1973-03-05 1974-02-27 Print hammer registration control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00338133A US3842736A (en) 1973-03-05 1973-03-05 Print hammer registration control

Publications (1)

Publication Number Publication Date
US3842736A true US3842736A (en) 1974-10-22

Family

ID=23323540

Family Applications (1)

Application Number Title Priority Date Filing Date
US00338133A Expired - Lifetime US3842736A (en) 1973-03-05 1973-03-05 Print hammer registration control

Country Status (7)

Country Link
US (1) US3842736A (fr)
JP (1) JPS5340421B2 (fr)
CA (1) CA981588A (fr)
DE (1) DE2404799C2 (fr)
FR (1) FR2220385B1 (fr)
GB (1) GB1435846A (fr)
IT (1) IT1003480B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111817610A (zh) * 2020-06-03 2020-10-23 中国人民解放军海军工程大学 用于电机驱动能源复用的电机选通装置及工作方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834306A (en) * 1973-03-26 1974-09-10 Ibm Print density control
DD125620A1 (fr) * 1976-03-29 1977-05-04
US4464833A (en) * 1982-09-01 1984-08-14 Usm Corporation Variable rate control logic for component insertion machine
DE3929196A1 (de) * 1989-09-02 1991-03-07 Apag Elektronik Ag Duebendorf Wasserbedeckungsabhaengige wischer-intervallsteuerung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
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
US3513774A (en) * 1968-07-01 1970-05-26 Ibm Printer hammer compensation
US3636867A (en) * 1969-06-28 1972-01-25 Honeywell Inf Systems Print timing and speed control circuit for high-speed printers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111817610A (zh) * 2020-06-03 2020-10-23 中国人民解放军海军工程大学 用于电机驱动能源复用的电机选通装置及工作方法
CN111817610B (zh) * 2020-06-03 2021-11-02 中国人民解放军海军工程大学 用于电机驱动能源复用的电机选通装置及工作方法

Also Published As

Publication number Publication date
DE2404799C2 (de) 1982-04-08
JPS5340421B2 (fr) 1978-10-27
DE2404799A1 (de) 1974-09-19
IT1003480B (it) 1976-06-10
JPS49121444A (fr) 1974-11-20
FR2220385A1 (fr) 1974-10-04
GB1435846A (en) 1976-05-19
CA981588A (en) 1976-01-13
FR2220385B1 (fr) 1979-01-05

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