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US3804009A - Spring-driven printing hammer arrangement - Google Patents

Spring-driven printing hammer arrangement Download PDF

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Publication number
US3804009A
US3804009A US00310174A US31017472A US3804009A US 3804009 A US3804009 A US 3804009A US 00310174 A US00310174 A US 00310174A US 31017472 A US31017472 A US 31017472A US 3804009 A US3804009 A US 3804009A
Authority
US
United States
Prior art keywords
hammer
pawl
spring
printing
lever
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
US00310174A
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English (en)
Inventor
P Blume
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.)
US Philips Corp
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3804009A publication Critical patent/US3804009A/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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/30—Springs

Definitions

  • the spring is a helical spring which engages a frame which is rigidly secured to the hammer.
  • the spring is a leaf-spring which engages a pal] pawl which is journalled on the hammer.
  • the invention relates to a printing hammer arrangement for printing on the fly, for example, for parallel printers, in which the hammer is influenced by a spring which can be locked and unlocked.
  • a number of printing hammer arrangements are already known in which the driving of the hammers occurs electromagnetically or electrodynamically.
  • the use of electro-mechanical converters has proven to be disadvantageous; due to their very poor efficiency to percent), and their comparatively large consumption of electric energies necessary for printing. Since up to I36 printing hammer units are arranged beside each other in the parallel printer, the heat dissipation in itself is a particular problem.
  • the energy present in the hammer during the return stroke is dissipated by the impact against a second movable mass, so that the system comes to rest in the neutral position of the spring.
  • a drawback in these known devices is that their reliability depends upon relatively undefined properties, for example, the coefficient of friction of the clamping device, or the impact upon contacting a second mass. Furthermore, it is unfavorable for the hammer not to be returned to the starting position after impact. The hammer is usually considerably closer to the paper and the ink ribbon than is desirable.
  • the coupling pawl is weighted by means of an extra mass. After the impact of the body (hammer or driving lever) which supports the pawl, it is rotated out of the engagement zone at a sudden initial angular velocity due to the inertia action of said extra mass.
  • the velocity in the pawl-mass" system at the instant of uncoupling can without objection be made approximately as large as the velocity of the hammer. Therefore it is only necessary for the hammer to have a free stroke which is comparable to the distance over which uncoupling takes place.
  • FIG. 1 is a schematic drawing of a rotational hammer mechanism according to the invention
  • FIG. 2 is a schematic drawing of a translational hammer-mechanism according to the invention.
  • FIG. 3 is a graphical representation of the pawl showing the inertia effect.
  • the hammer l which is rotatably journalled about the pivot M, is maintained in the rest position by the action of the permanent magnet 2.
  • a force is exerted on the hammer via a driving lever 4, which is rigidly secured to the hammer 1 and the pawl 5.
  • the spring force tries to move the hammer in the direction of the paper 6, the ink ribbon 7 and the type roller 8.
  • the action of the permanent magnetic field is removed for a short period of time, by
  • the pawl 5 is rotated'out of the field of the hammer by the inertia movement of the mass 11, so that the hammer can immediately return to the rest position without being hindered by the driving lever. It is held in the rest position by the permanent magnet. Since the rest position is approximately 3 mm remote from the point of impact, a double print resulting from impact vibrations is avoid'edwith certainty.
  • the driving lever 4 is moved'back to the rest position by the pin 13 of the continuously rotating eccentric 14.
  • the spring is tensioned, and the pawl 5 is coupled to the hammer by means of the spring 15. The printing cycle is thus completed, and the printing device is ready for printing the next line.
  • the printing device shown in FIG. 2 is of a construction similar to that of the above-described device of FIG. 1, and its pawl functions in like manner.
  • a hammer 16 which is secured to the leaf springs 17 and 18 is provided, and a leaf spring l9is usedas a driving element. Since the pawl 20 weighted with the extra mass 21, is secured to the hammer, rotation of the pawl begins only when the hammer impacts, and not when the spring impacts the abutment 22. It can be proved, however, that for similar changes of linear velocity and pawl dimensions, the coupling pawl will pivot an equal distance to that obtained with a rotational hammer and lever.
  • the tip of the pawl then has a velocity a M M 0 8 in which a is the distance from the tip of the pawl to the fulcrum.
  • v By a suitable distribution of the masses over the arm and the head of the pawl, v, can be made as large as v, to an approximation.
  • the mass of the pawl In order to limit the energy losses of the system, the mass of the pawl must be kept minimum and the kinetic energy stored in the head of the pawl may not be more than 10 to percent of the overall energy.
  • FIGS. 1 and 2 are mere examples. It will be obvious that the system in FIG. 1 can be driven with a leaf spring, and the system shown in FIG. 2 can be driven with a helical spring. It is also possible to cause the permanent magnet to hold the driving lever 4 instead of the hammer. Finally, instead of the axial bearing for the lever and pawl, a leaf spring bearing without friction may be chosen.
  • a printing hammer arrangement for use in impact printers comprising:
  • coupling means pivotably connected to said hammer for transmitting driving force from said spring to said hammer, said coupling means comprising a pawl having a weighted portion at one end thereof, the inertia of said weighted portion causing rotation of said pawl from a coupled position to an uncoupled position after said hammer has reached a pre-determined position while traveling from said rest position toward said printing position;
  • said coupling means further comprises a driving lever pivotably connected at one end thereofto said hammer, said spring being connected to said lever at a point removed from said one end, said pawl being pivotably connected about a mid-portion thereof to said lever at a point removed from said one end, said pawl engaging said hammer at the end opposite said weighted portion when in said coupled position for transmitting driving force from said spring, and
  • said arrangement further comprises abutment means fixed in position for contacting said lever at a point removed from said one end when said hammer has reached said pre-determined position so as to stop motion of that portion of the lever, whereby the inertia of said weighted portion will rotate said pawl to said uncoupled position disengaging said pawl from said hammer.
  • hammer mounting means comprises a mounting for rotational movement of said hammer between said rest and printing positions about the same point at which said lever is connected to said hammer
  • said re-setting means comprises means for moving said lever out of contact with said abutment means.

Landscapes

  • Impact Printers (AREA)
US00310174A 1971-12-03 1972-11-28 Spring-driven printing hammer arrangement Expired - Lifetime US3804009A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2160032A DE2160032C2 (de) 1971-12-03 1971-12-03 Druckhammeranordnung mit Federantrieb

Publications (1)

Publication Number Publication Date
US3804009A true US3804009A (en) 1974-04-16

Family

ID=5826921

Family Applications (1)

Application Number Title Priority Date Filing Date
US00310174A Expired - Lifetime US3804009A (en) 1971-12-03 1972-11-28 Spring-driven printing hammer arrangement

Country Status (8)

Country Link
US (1) US3804009A (it)
JP (1) JPS5411730B2 (it)
DE (1) DE2160032C2 (it)
FR (1) FR2164202A5 (it)
GB (1) GB1340839A (it)
IT (1) IT973825B (it)
NL (1) NL7216166A (it)
SE (1) SE385414B (it)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881412A (en) * 1972-11-18 1975-05-06 Olympia Werke Ag Printer for data processing machines
US3905294A (en) * 1973-02-16 1975-09-16 Pertec Corp High speed line printing apparatus
US3935813A (en) * 1973-10-11 1976-02-03 Tokyo Juki Kogyo Kabushiki Kaisha Print hammer device
US3967551A (en) * 1974-07-31 1976-07-06 Tokyo Juki Kogyo Kabushiki Kaisha Print mechanism with rockable interposing lever for print hammer
US3985218A (en) * 1975-05-16 1976-10-12 Gerry Martin E Low inertia impact printing means
US4009655A (en) * 1975-07-07 1977-03-01 Tokyo Juki Kogyo Kabushiki Kaisha Print hammer actuation device
US4037704A (en) * 1975-07-03 1977-07-26 Ncr Corporation Actuator for a wire matrix printer and method of making
US4233894A (en) * 1978-06-02 1980-11-18 Printronix, Inc. Print hammer mechanism having dual pole pieces
US4324497A (en) * 1979-11-05 1982-04-13 Xerox Corporation Print hammer assembly with amplified multi-location impacts
US4327639A (en) * 1979-11-05 1982-05-04 Xerox Corporation Print hammer assembly with multi-location impacts
US4329921A (en) * 1979-08-20 1982-05-18 Siemens Aktiengesellschaft Damping device for an electromagnetically driven printing hammer
US4393769A (en) * 1980-12-31 1983-07-19 International Business Machines Corporation Electrostatic clutch-operated printing mechanism
US4423675A (en) 1982-03-08 1984-01-03 Hewlett-Packard Company Magnetic circuit and print hammer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5714994B2 (it) * 1974-02-28 1982-03-27

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164085A (en) * 1961-12-20 1965-01-05 Solartron Electronic Group Mechanical linkages to electro-magnets and solenoids controlling print hammer mechanisms
US3351007A (en) * 1965-10-18 1967-11-07 Control Data Corp Print hammer rapid reset means in high speed printers
US3507214A (en) * 1969-06-13 1970-04-21 Scm Corp Print hammer module apparatus
US3587456A (en) * 1969-01-15 1971-06-28 Klaus H Jaensch High speed print hammer construction
US3648602A (en) * 1970-04-27 1972-03-14 Avgerinos Inc Parallel input printing mechanism
US3673956A (en) * 1969-01-31 1972-07-04 English Numbering Machines High speed print mechanism with interposer arm for print hammer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB674812A (en) * 1949-11-18 1952-07-02 Ncr Co Rebound dampening devices for printing hammers
US3155033A (en) * 1961-05-29 1964-11-03 Ibm Print hammer drive mechanism
US3780648A (en) * 1969-09-02 1973-12-25 Nortec Computer Devices High speed print hammer with dynamic damper means

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164085A (en) * 1961-12-20 1965-01-05 Solartron Electronic Group Mechanical linkages to electro-magnets and solenoids controlling print hammer mechanisms
US3351007A (en) * 1965-10-18 1967-11-07 Control Data Corp Print hammer rapid reset means in high speed printers
US3587456A (en) * 1969-01-15 1971-06-28 Klaus H Jaensch High speed print hammer construction
US3673956A (en) * 1969-01-31 1972-07-04 English Numbering Machines High speed print mechanism with interposer arm for print hammer
US3507214A (en) * 1969-06-13 1970-04-21 Scm Corp Print hammer module apparatus
US3648602A (en) * 1970-04-27 1972-03-14 Avgerinos Inc Parallel input printing mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin, Vol. 5, No. 11, April 1963, pp. 27 29, Bear and McGuine. *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881412A (en) * 1972-11-18 1975-05-06 Olympia Werke Ag Printer for data processing machines
US3905294A (en) * 1973-02-16 1975-09-16 Pertec Corp High speed line printing apparatus
US3935813A (en) * 1973-10-11 1976-02-03 Tokyo Juki Kogyo Kabushiki Kaisha Print hammer device
US3967551A (en) * 1974-07-31 1976-07-06 Tokyo Juki Kogyo Kabushiki Kaisha Print mechanism with rockable interposing lever for print hammer
US3985218A (en) * 1975-05-16 1976-10-12 Gerry Martin E Low inertia impact printing means
US4037704A (en) * 1975-07-03 1977-07-26 Ncr Corporation Actuator for a wire matrix printer and method of making
US4009655A (en) * 1975-07-07 1977-03-01 Tokyo Juki Kogyo Kabushiki Kaisha Print hammer actuation device
US4233894A (en) * 1978-06-02 1980-11-18 Printronix, Inc. Print hammer mechanism having dual pole pieces
US4329921A (en) * 1979-08-20 1982-05-18 Siemens Aktiengesellschaft Damping device for an electromagnetically driven printing hammer
US4324497A (en) * 1979-11-05 1982-04-13 Xerox Corporation Print hammer assembly with amplified multi-location impacts
US4327639A (en) * 1979-11-05 1982-05-04 Xerox Corporation Print hammer assembly with multi-location impacts
US4393769A (en) * 1980-12-31 1983-07-19 International Business Machines Corporation Electrostatic clutch-operated printing mechanism
US4423675A (en) 1982-03-08 1984-01-03 Hewlett-Packard Company Magnetic circuit and print hammer

Also Published As

Publication number Publication date
GB1340839A (en) 1973-12-19
SE385414B (sv) 1976-06-28
DE2160032A1 (de) 1973-06-07
DE2160032C2 (de) 1981-12-17
IT973825B (it) 1974-06-10
FR2164202A5 (it) 1973-07-27
JPS4865847A (it) 1973-09-10
NL7216166A (it) 1973-06-05
JPS5411730B2 (it) 1979-05-17

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