US3302562A - Means to prevent excessive frictional loading in a wire printer - Google Patents

Means to prevent excessive frictional loading in a wire printer Download PDF

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US3302562A
US3302562A US378616A US37861664A US3302562A US 3302562 A US3302562 A US 3302562A US 378616 A US378616 A US 378616A US 37861664 A US37861664 A US 37861664A US 3302562 A US3302562 A US 3302562A
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character forming
forming elements
portions
enclosure
fluent material
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US378616A
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Roland D Nelson
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International Business Machines Corp
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International Business Machines Corp
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Priority to US378616A priority Critical patent/US3302562A/en
Priority to GB24717/65A priority patent/GB1048514A/en
Priority to DEJ28379A priority patent/DE1239874B/en
Priority to NL656508256A priority patent/NL149312B/en
Priority to FR22237A priority patent/FR1442666A/en
Priority to CH895965A priority patent/CH423325A/en
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    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/265—Guides for print wires

Definitions

  • the sliding motion of the wire causes the ink to work its way from the print end of the print wires throughout the entire length of the wire and the tube to the setup mechanism.
  • the resultant high friction causes excessive wear of the actuating device and the other parts of the system and also appreciably increases the operative force required to operate the printer.
  • the excessive wire friction caused by the ink has become an even greater problem since it is more diflicult to drive the wires at the rate required. It is therefore the principal object of this invention to provide a printing apparatus which prevents ink and other foreign matter from entering the working area of the print mechanism.
  • a print mechanism comprising a plurality of selectively axially displaceable character forming elements, wherein a portion of the character forming elements passes through an enclosure and wherein a fluent material is disposed within the enclosure and is subjected to pressure to provide a seal around each character forming element so that ink, card dust, and other foreign matter is blocked from moving from the character forming ends of the character forming elements to the printer operating mechanism.
  • FIG. 1 is a perspective view, partly in section along lines AA of FIG. 4, of a print head assembly embodying the invention
  • FIG. 2 is a 90-degree segment of the control cam of the wire printer of FIG. 3;
  • FIG. 3 is a perspective view of a wire printer utilizing a plurality of the print head assemblies shown in FIG. 1;
  • FIG. 4 is an end view of the print head assembly.
  • the print mechanism comprises a print head comprising a housing having hollow portions 12 through which the print guide tubes 14 are inserted and fixed into position in the proper alignment.
  • Character forming wires 16 are mounted within the guide tubes 14 so that by selective axial displacement of the print wires 16 a character is formed, and the selected character is recorded on record member 18 by driving the character forming ends 20 of the print wires against an inked ribbon 22, record card 18, and a relatively fixed platen member (not shown).
  • the wire print head 10 is provided with a reservoir or cavity 24 through which print wires 16 pass from the ends of guide tubes Patented Feb. 7-, l67
  • a fluent material is injected into the cavity and subjected to pressure so that the fluent material closely surrounds the portion of the print wires extending through the cavity.
  • the fluent material consists of a mixture of three components, a flow restricting material, a filler material, and a bonding material.
  • the particle size of the flow restricting material must be small enough to permit entry between the wires in the matrix, but large enough to prevent entry of the mixture between print wires 16 and their guide tubes 14. Also, the material must be chemically inert and have a low coeflicient of friction.
  • a nylon powder has been found suitable for the flow restricting material of the mixture.
  • the filler powder must be of very small particle size to seal 01f the pores in the flow restricting powder and thereby prevent ink from flowing through the material.
  • the filler powder also must be chemically inert and have a low coefficient of friction. Polyethylene powder has been found suitable for the filler material.
  • a chemically inert bonding material must be used to seal the small pores of the mixture of the filler powder and the flow restricting powder and to improve the flow characteristics of the mixture.
  • a silicone grease such as that manufactured under the trade name of Dow Corning No. 3, has been found suitable.
  • the proportions of the three components of the fluent material can be determined experimentally for a particular application, and equal volume of each of the three components has been found to be one suitable mixture.
  • the fluent material is pressurized to insure that the material closely surrounds each of print wires 16, and the small reservoir provides a suflicient quantity of the fluent material to compensate for leakage, wear and thermal expansion.
  • the fluent material is injected into the cavity through a loading opening 40, and a bleed hole 42 is provided to aid in the removal of excess material.
  • Bleed hole opening 42 is then closed as by the application of a tight fitting screw 43, and the fluent material is then pressurized by applying a force to a tight fitting pressure piston 44 which is inserted within loading opening 40.
  • a second bleed hole 46 is provided to remove excess fluent material, and the material is maintained under pressure by a pressure spring 48 held in position by a suitable means such as a set screw 50 applied in loading opening 40.
  • a balance in the pressure used may be determined experimentally from the opposing consideration of complete stoppage of ink flow by a high pressure and the increased frictional forces on the print wires by the high pressure of the fluent material. In practice, a pressure of approximately 45 pounds per square inch has been found suitable since this pressure completely stops the flow of ink from reaching guide tubes 14 and produces a frictional drag on each wire of approximately ten grams force, which is not objectionable in the embodiment shown. If the friction force is too high, the print wires may fail to operate dynamically at full speed.
  • the print wires have an outside diameter of .008 inch, and these wires operate in a guide tube having a .010 inch inside diameter.
  • the wires are set on .015 inch centers so that a nominal .007 inch gap is present between wire surfaces as they pass through enclosure 24.
  • a flow restricting material consisting of a nylon powder having a particle size of .002 to .007 inch is suitable.
  • the filler powder consists of polyethylene powder having a particle size of 500 microns, and the bonding material consists of a silicone grease.
  • the components of the fluent material are combined in equal volume.
  • FIG. 3 A diagrammatic view of a Wire printer embodying the invention is shown in FIG. 3.
  • a platen member (not shown) backs up a suitable recording material, such as a ribbon 22, disposed opposite the record member and the platen member.
  • the character forming ends 20 of a plurality of print wires 16 are positioned on the other side of the ribbon.
  • the print wires 16 are slideably supported in guide tubes 14 which converge at the print ends of the wires to form a print head 10.
  • the print heads are movably mounted by bracket 15 so that each printhead is operator adjustable to provide printing of a line in any location on record card 18.
  • the other ends of the guide tubes and wires fan out, and the wires 16 are attached to a wire setting mechanism.
  • the wire setting mechanism comprises a cam 28 which controls the movement of bell cranks 30 which comprise armatures for magnetic holding means 33.
  • bell cranks 30 which comprise armatures for magnetic holding means 33.
  • armatures 30 When the armatures 30 are released by magnetic bucking coils 32, the motive force for driving the print wires to the operative position is supplied by a resilient means, such as coil springs 34.
  • the contour of the cam is provided with a wire setup portion 36 and a printing portion 38.
  • the print data is provided by suitable electronic control circuitry (not shown), and the operation is timed so that at the zero point in FIG. 2 the release of the character forming elements comprising the selected character is initiated. This operation is performed by electronically selecting individual bucking coils 32 to buck out the flux generated by the hold coil 33 so that the bell crank is released to wire setup portion 36 of the cam.
  • the print cam controls the character setup, regulates the impact of the wires, and restores the armatures to the hold magnet after printing.
  • the released armatures have stabilized by the start of the print zone 38 of the cam, and the bell cranks are driven by the force of the springs 34 so that the print ends of the character forming elements are moved to the print position to impress the selected character upon the record member.
  • a print head assembly to solve the problem of excessive friction caused by ink and other foreign material being moved into the operating mechanism of a wire printer.
  • the print head assembly possesses small size, low inertia, and high mobility, so that it is suitable for solving this problem in not only the wire printer shown in the drawings but also in wire printers of the type shown in U.S. Patents 2,580,- 788, 2,785,627 and 2,802,414.
  • a wire printing mechanism comprising:
  • pressure forming means to pressurize said fluent material in said enclosure to block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements.
  • a printing transducer comprising:
  • each of said character forming elements having character forming ends extending from said guide means;
  • a housing having a cavity filled with a fluent material
  • pressure forming means to apply pressure to said fluent material to prevent foreign material from moving along said character forming elements to said guide means.
  • a printing transducer comprising:
  • each of said character forming elements having character forming ends extending from said guide means;
  • a housing having a cavity filled with a fluent material, said fluent material comprising a mixture of plastic powders and a bonding material;
  • pressure forming means to apply pressure to said fluent material to prevent foreign material from moving along said character forming elements to said guide means.
  • a printing transducer comprising:
  • each of said character forming elements having character forming ends extending from said guide means;
  • a housing having a cavity filled with a fluent material said fluent material comprising a fiow restricting material, a filler material, and a bonding material;
  • pressure forming means to apply pressure to said fluent material to prevent foreign material from moving along said character forming elements to said guide means.
  • a wire printing mechanism comprising:
  • said fluent material comprising a mixture of plastic powders and a bonding material
  • pressure forming means to pressurize said fluent material in said enclosure to block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements.
  • a wire printing mechanism comprising:
  • a fluent material disposed in said enclosure surrounding said second portions of said character forming elements, said fluent material comprising a flow restricting material, a filler material, and a bonding material; and z pressure forming means to pressurize said fluent material in said enclosure to block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements.
  • a wire printing mechanism comprising:
  • a fluent material disposed in said enclosure surroundin g said second portions of said character forming elements, said fluent material comprising a mixture of plastic powders and a bonding material;
  • resilient means to drive selected ones of said character forming elements to a record marking position.
  • a Wire printing mechanism comprising:
  • a fluent material disposed in said enclosure, said fiuent material comprising a flow restricting material, a filler material, and a bonding material;
  • resilient means to drive selected ones of said character forming elements to a record marking position.
  • a wire printing mechanism comprising:
  • a housing having a central enclosure and a plurality of openings thereto;
  • a fluent material comprising a mixture of plastic powders and a bonding material
  • resilient means to drive selected ones of said character forming elements to a record marking position.
  • a wire printing mechanism comprising:
  • a housing having a central enclosure and a plurality of openings thereto;
  • a fluent material comprising a mixture of nylon powder
  • pressure forming means to pressurize said fluent material in said enclosure to :block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements;
  • resilient means to drive selected ones of said character forming elements to a record marking position.

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Description

Feb. 7, 1967 R. D. NELSON 3,302,562
MEANS TO PREVENT EXCESSIVE FRICTIONAL LOADING IN A WIRE PRINTER Filed June 29, 1964 2 Sheets-Sheet 1 INVENTOR.
ROLAND D. NELSON ATTORNEY Feb. 7, 1967 NELSON 3,302,562
MEANS TO PREVENT EXCESSIVE FRICTIONAL LOADING IN A WIRE PRINTER Filed June 29, 1964 2 Sheets-Sheet 2 FIG. 4
United States Patent f 3,302,562 MEANS TO PREVENT EXESSIVE FRICTIONAL LOADING IN A WERE PRINTER Roland D. Nelson, San Jose, Calif., assignor to International Business Machines Corporation, New York, N.Y., a corporation of New York Filed June 29, 1964, Ser. No. 378,616 11 Claims. (Cl. 101-103) This invention relates to wire printers and, more particularly, to print head assemblies.
A problem has long existed in wire printers of increased frictional loading of the mechanism over a period of operation due to ink from the ribbon working its way into the space between the print wire and its guide tube. The sliding motion of the wire causes the ink to work its way from the print end of the print wires throughout the entire length of the wire and the tube to the setup mechanism. The resultant high friction causes excessive wear of the actuating device and the other parts of the system and also appreciably increases the operative force required to operate the printer. As the speed of operation of wire printers has increased, the excessive wire friction caused by the ink has become an even greater problem since it is more diflicult to drive the wires at the rate required. It is therefore the principal object of this invention to provide a printing apparatus which prevents ink and other foreign matter from entering the working area of the print mechanism.
It is another object of this invention to provide a printing apparatus which is adapted to use in a high speed printer and which is reliable in operation.
It is a further object of the invention to provide a print head assembly that is usable in high speed printers which utilize springs to provide the force to actuate the print mechanism.
Briefly, according to the invention, a print mechanism is provided comprising a plurality of selectively axially displaceable character forming elements, wherein a portion of the character forming elements passes through an enclosure and wherein a fluent material is disposed within the enclosure and is subjected to pressure to provide a seal around each character forming element so that ink, card dust, and other foreign matter is blocked from moving from the character forming ends of the character forming elements to the printer operating mechanism.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of a preferred embodiment of the invention, as illustrated in the accompanying drawings.
FIG. 1 is a perspective view, partly in section along lines AA of FIG. 4, of a print head assembly embodying the invention;
FIG. 2 is a 90-degree segment of the control cam of the wire printer of FIG. 3;
FIG. 3 is a perspective view of a wire printer utilizing a plurality of the print head assemblies shown in FIG. 1;
FIG. 4 is an end view of the print head assembly.
In accordance with the invention, the print mechanism comprises a print head comprising a housing having hollow portions 12 through which the print guide tubes 14 are inserted and fixed into position in the proper alignment. Character forming wires 16 are mounted within the guide tubes 14 so that by selective axial displacement of the print wires 16 a character is formed, and the selected character is recorded on record member 18 by driving the character forming ends 20 of the print wires against an inked ribbon 22, record card 18, and a relatively fixed platen member (not shown). The wire print head 10 is provided with a reservoir or cavity 24 through which print wires 16 pass from the ends of guide tubes Patented Feb. 7-, l67
14 to the print wire guide matrix 26 formed in the print head face. A fluent material is injected into the cavity and subjected to pressure so that the fluent material closely surrounds the portion of the print wires extending through the cavity.
The fluent material consists of a mixture of three components, a flow restricting material, a filler material, and a bonding material. The particle size of the flow restricting material must be small enough to permit entry between the wires in the matrix, but large enough to prevent entry of the mixture between print wires 16 and their guide tubes 14. Also, the material must be chemically inert and have a low coeflicient of friction. A nylon powder has been found suitable for the flow restricting material of the mixture. The filler powder must be of very small particle size to seal 01f the pores in the flow restricting powder and thereby prevent ink from flowing through the material. The filler powder also must be chemically inert and have a low coefficient of friction. Polyethylene powder has been found suitable for the filler material. A chemically inert bonding material must be used to seal the small pores of the mixture of the filler powder and the flow restricting powder and to improve the flow characteristics of the mixture. A silicone grease, such as that manufactured under the trade name of Dow Corning No. 3, has been found suitable. The proportions of the three components of the fluent material can be determined experimentally for a particular application, and equal volume of each of the three components has been found to be one suitable mixture.
The fluent material is pressurized to insure that the material closely surrounds each of print wires 16, and the small reservoir provides a suflicient quantity of the fluent material to compensate for leakage, wear and thermal expansion. In the embodiment shown, the fluent material is injected into the cavity through a loading opening 40, and a bleed hole 42 is provided to aid in the removal of excess material. When the cavity is first loaded, the material is added until an excess is extruded at bleed hole opening 42. Bleed hole opening 42 is then closed as by the application of a tight fitting screw 43, and the fluent material is then pressurized by applying a force to a tight fitting pressure piston 44 which is inserted within loading opening 40. A second bleed hole 46 is provided to remove excess fluent material, and the material is maintained under pressure by a pressure spring 48 held in position by a suitable means such as a set screw 50 applied in loading opening 40. A balance in the pressure used may be determined experimentally from the opposing consideration of complete stoppage of ink flow by a high pressure and the increased frictional forces on the print wires by the high pressure of the fluent material. In practice, a pressure of approximately 45 pounds per square inch has been found suitable since this pressure completely stops the flow of ink from reaching guide tubes 14 and produces a frictional drag on each wire of approximately ten grams force, which is not objectionable in the embodiment shown. If the friction force is too high, the print wires may fail to operate dynamically at full speed.
In a specific printer mechanism, the print wires have an outside diameter of .008 inch, and these wires operate in a guide tube having a .010 inch inside diameter. The wires are set on .015 inch centers so that a nominal .007 inch gap is present between wire surfaces as they pass through enclosure 24. For this mechanism a flow restricting material consisting of a nylon powder having a particle size of .002 to .007 inch is suitable. The filler powder consists of polyethylene powder having a particle size of 500 microns, and the bonding material consists of a silicone grease. The components of the fluent material are combined in equal volume.
A diagrammatic view of a Wire printer embodying the invention is shown in FIG. 3. A platen member (not shown) backs up a suitable recording material, such as a ribbon 22, disposed opposite the record member and the platen member. The character forming ends 20 of a plurality of print wires 16 are positioned on the other side of the ribbon. The print wires 16 are slideably supported in guide tubes 14 which converge at the print ends of the wires to form a print head 10. The print heads are movably mounted by bracket 15 so that each printhead is operator adjustable to provide printing of a line in any location on record card 18. The other ends of the guide tubes and wires fan out, and the wires 16 are attached to a wire setting mechanism. The wire setting mechanism comprises a cam 28 which controls the movement of bell cranks 30 which comprise armatures for magnetic holding means 33. When the armatures 30 are released by magnetic bucking coils 32, the motive force for driving the print wires to the operative position is supplied by a resilient means, such as coil springs 34. The contour of the cam is provided with a wire setup portion 36 and a printing portion 38. The print data is provided by suitable electronic control circuitry (not shown), and the operation is timed so that at the zero point in FIG. 2 the release of the character forming elements comprising the selected character is initiated. This operation is performed by electronically selecting individual bucking coils 32 to buck out the flux generated by the hold coil 33 so that the bell crank is released to wire setup portion 36 of the cam. The print cam controls the character setup, regulates the impact of the wires, and restores the armatures to the hold magnet after printing. The released armatures have stabilized by the start of the print zone 38 of the cam, and the bell cranks are driven by the force of the springs 34 so that the print ends of the character forming elements are moved to the print position to impress the selected character upon the record member.
Thus, it can be seen that there is provided a print head assembly to solve the problem of excessive friction caused by ink and other foreign material being moved into the operating mechanism of a wire printer. The print head assembly possesses small size, low inertia, and high mobility, so that it is suitable for solving this problem in not only the wire printer shown in the drawings but also in wire printers of the type shown in U.S. Patents 2,580,- 788, 2,785,627 and 2,802,414.
While the invention has been particularly shown and described with reference to a preferred embodiment thereof, it will be understood by those skilled in the art that the foregoing and other changes in the form and details may be made therein without departing from the spirit and scope of the invention.
What is claimed is:
1. A wire printing mechanism, comprising:
an enclosure;
a plurality of selectively movable character forming elements having first character forming portions and having second portions thereof passing through said enclosure;
a fluent material disposed in said enclosure surrounding said second portions of said character forming elements; and
pressure forming means to pressurize said fluent material in said enclosure to block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements.
2. In a recording device:
a plurality of character forming elements selectively actuable for moving the character forming ends into and out of engagement with a record medium;
a fluent material;
means for positioning said fluent material to surround a portion of said character forming elements; and
means for applying pressure to said fluent material so that the movement of foreign material along the character forming elements from said character forming ends is limited thereby.
3. A printing transducer, comprising:
a plurality of character forming elements mounted within guide means, each of said character forming elements having character forming ends extending from said guide means;
a housing having a cavity filled with a fluent material;
means for mounting the character forming elements within said housing so that a portion of each of the character forming elements extending from said guide means passes through said fluent material; and
pressure forming means to apply pressure to said fluent material to prevent foreign material from moving along said character forming elements to said guide means.
4. A printing transducer, comprising:
a plurality of character forming elements mounted within guide means, each of said character forming elements having character forming ends extending from said guide means;
a housing having a cavity filled with a fluent material, said fluent material comprising a mixture of plastic powders and a bonding material;
means for mounting the character forming elements within said housing so that a portion of each of the character forming elements extending from said guide means passes through said fluent material; and
pressure forming means to apply pressure to said fluent material to prevent foreign material from moving along said character forming elements to said guide means.
5. A printing transducer, comprising:
a plurality of character forming elements mounted within guide means, each of said character forming elements having character forming ends extending from said guide means;
a housing having a cavity filled with a fluent material said fluent material comprising a fiow restricting material, a filler material, and a bonding material;
means for mounting the character forming elements within said housing so that a portion of each of the character forming elements extending from said guide means passes through said fluent material; and
pressure forming means to apply pressure to said fluent material to prevent foreign material from moving along said character forming elements to said guide means.
6. A wire printing mechanism, comprising:
an enclosure;
a plurality of selectively movable character forming elements having first character forming portions and having second portions thereof passing through said enclosure;
a fluent material disposed in said enclosure surrounding said second portions of said character forming elements. said fluent material comprising a mixture of plastic powders and a bonding material; and
pressure forming means to pressurize said fluent material in said enclosure to block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements.
7. A wire printing mechanism, comprising:
an enclosure;
a plurality of selectively movable character forming elements having first character forming portions and having second portions thereof passing through said enclosure;
a fluent material disposed in said enclosure surrounding said second portions of said character forming elements, said fluent material comprising a flow restricting material, a filler material, and a bonding material; and z pressure forming means to pressurize said fluent material in said enclosure to block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements.
8. A wire printing mechanism, comprising:
an enclosure;
a plurality of selectively movable character forming elements having first character forming portions and having second portions thereof passing through said enclosure;
a fluent material disposed in said enclosure surroundin g said second portions of said character forming elements, said fluent material comprising a mixture of plastic powders and a bonding material;
pressure forming means to pressurize said fluent material in said enclosure to block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements; and
resilient means to drive selected ones of said character forming elements to a record marking position.
9. A Wire printing mechanism, comprising:
an enclosure;
a plurality of selectively movable character forming elements having first character forming portions and having second portions thereof passing through said enclosure surrounding said second portions of said character forming elements;
a fluent material disposed in said enclosure, said fiuent material comprising a flow restricting material, a filler material, and a bonding material;
pressure forming means to pressurize said fluent material in said enclosure to block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements; and
resilient means to drive selected ones of said character forming elements to a record marking position.
10. A wire printing mechanism, comprising:
a housing having a central enclosure and a plurality of openings thereto;
a plurality of selectively movable character forming elements mounted in said omnings, said character forming elements having first character forming portions extending beyond said enclosure and having second portions thereof passing through said enclosure;
a fluent material comprising a mixture of plastic powders and a bonding material;
&
means for loading said fluent material into said enclosure surrounding said second portions of said character forming elements;
pressure forming means to pressurize said fluent material in said enclosure to block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements; and
resilient means to drive selected ones of said character forming elements to a record marking position.
11. A wire printing mechanism, comprising:
a housing having a central enclosure and a plurality of openings thereto;
a plurality of selectively movaible character forming elements mounted in said openings, said character forming elements having first character forming portions extending beyond said enclosure and having second portions thereof passing through said enclosure;
a fluent material comprising a mixture of nylon powder,
polyethylene powder and silicone grease;
means for loading said fluent material into said enclosure surrounding said second portions of said character forming elements;
pressure forming means to pressurize said fluent material in said enclosure to :block the passage of foreign material from said character forming portions beyond said second portions of said character forming elements; and
resilient means to drive selected ones of said character forming elements to a record marking position.
References Cited by the Examiner UNITED STATES PATENTS 2,712,862 7/1955 Pemberton 188-205 2,785,627 3/1957 Johnson 101-93 2,787,952 4/1957 Roche 10193 2,928,338 3/1960 Wockenfuss 101-93 3,087,420 4/1963 Brehm 10193 References Cited by the Applicant UNITED STATES PATENTS 1,056,010 3/1913 Dailey. 2,712,862 7/1955 Pemberton. 2,928,338 3/1960 Wockenfuss.
5O WILLIAM B. PENN, Primary Examiner.

Claims (1)

1. A WIRE PRINTING MECHANISM, COMPRISING: AN ENCLOSURE; A PLURALITY OF SELECTIVELY MOVABLE CHARACTER FORMING ELEMENTS HAVING FIRST CHARACTER FORMING PORTIONS AND HAVING SECOND PORTIONS THEREOF PASSING THROUGH SAID ENCLOSURE; A FLUENT MATERIAL DISPOSED IN SAID ENCLOSURE SURROUNDING SAID SECOND PORTIONS OF SAID CHARACTER FORMING ELEMENTS; AND PRESSURE FORMING MEANS TO PRESSURIZE SAID FLUENT MATERIAL IN SAID ENCLOSURE TO BLOCK THE PASSAGE OF FOREIGN MATERIAL FROM SAID CHARACTER FORMING PORTIONS BEYOND SAID SECOND PORTIONS OF SAID CHARACTER FORMING ELEMENTS.
US378616A 1964-06-29 1964-06-29 Means to prevent excessive frictional loading in a wire printer Expired - Lifetime US3302562A (en)

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Application Number Priority Date Filing Date Title
US378616A US3302562A (en) 1964-06-29 1964-06-29 Means to prevent excessive frictional loading in a wire printer
GB24717/65A GB1048514A (en) 1964-06-29 1965-06-11 Improvements in or relating to wire printers
DEJ28379A DE1239874B (en) 1964-06-29 1965-06-19 Print head for wire printer
NL656508256A NL149312B (en) 1964-06-29 1965-06-25 PRINT HEAD FOR A PRINT DEVICE.
FR22237A FR1442666A (en) 1964-06-29 1965-06-25 Wire printer
CH895965A CH423325A (en) 1964-06-29 1965-06-25 Print head for wire printer

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US378616A US3302562A (en) 1964-06-29 1964-06-29 Means to prevent excessive frictional loading in a wire printer

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US3302562A true US3302562A (en) 1967-02-07

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CH (1) CH423325A (en)
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NL (1) NL149312B (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592311A (en) * 1968-10-02 1971-07-13 Ibm Wire printing head
US3854564A (en) * 1970-06-17 1974-12-17 Logabax Printing heads for printing machines
US3889793A (en) * 1972-06-15 1975-06-17 Honeywell Inf Systems Mosaic printing head
US3900094A (en) * 1973-05-10 1975-08-19 Lrc Inc Matrix printer with overlapping print dots
US3991871A (en) * 1971-09-09 1976-11-16 Centronics Data Computer Corporation Print head and plastic bearings therefor
US4010836A (en) * 1974-04-10 1977-03-08 Ing. C. Olivetti & C., S.P.A. Wire printing device
US4023663A (en) * 1974-09-10 1977-05-17 U.S. Philips Corporation Matrix printer comprising lubricated printing wires
US4061219A (en) * 1972-02-24 1977-12-06 Canon Kabushiki Kaisha Printing device
US4155229A (en) * 1976-02-27 1979-05-22 Mathias Mitter Printing apparatus
US4264219A (en) * 1978-05-31 1981-04-28 Copal Company Limited Device for driving dot printing bars in a dot printer
US4308794A (en) * 1978-07-13 1982-01-05 Contardo Adamoli Hammer assembly for a serial typing device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897865A (en) * 1973-12-11 1975-08-05 Ibm Dot printing apparatus

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US1056010A (en) * 1910-08-04 1913-03-18 Fred A Dailey Plastic packing.
US2712862A (en) * 1950-02-04 1955-07-12 Robert C Pemberton Brake cable lubricator
US2785627A (en) * 1953-10-07 1957-03-19 Ibm Wire printer
US2787952A (en) * 1955-04-29 1957-04-09 Curtis H Roche High-speed printer apparatus
US2928338A (en) * 1954-04-15 1960-03-15 Burroughs Corp Wire printing mechanism
US3087420A (en) * 1959-11-19 1963-04-30 Ibm Ultra speed printer

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US1056010A (en) * 1910-08-04 1913-03-18 Fred A Dailey Plastic packing.
US2712862A (en) * 1950-02-04 1955-07-12 Robert C Pemberton Brake cable lubricator
US2785627A (en) * 1953-10-07 1957-03-19 Ibm Wire printer
US2928338A (en) * 1954-04-15 1960-03-15 Burroughs Corp Wire printing mechanism
US2787952A (en) * 1955-04-29 1957-04-09 Curtis H Roche High-speed printer apparatus
US3087420A (en) * 1959-11-19 1963-04-30 Ibm Ultra speed printer

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592311A (en) * 1968-10-02 1971-07-13 Ibm Wire printing head
US3854564A (en) * 1970-06-17 1974-12-17 Logabax Printing heads for printing machines
US3991871A (en) * 1971-09-09 1976-11-16 Centronics Data Computer Corporation Print head and plastic bearings therefor
US4061219A (en) * 1972-02-24 1977-12-06 Canon Kabushiki Kaisha Printing device
US3889793A (en) * 1972-06-15 1975-06-17 Honeywell Inf Systems Mosaic printing head
US3900094A (en) * 1973-05-10 1975-08-19 Lrc Inc Matrix printer with overlapping print dots
US4010836A (en) * 1974-04-10 1977-03-08 Ing. C. Olivetti & C., S.P.A. Wire printing device
US4023663A (en) * 1974-09-10 1977-05-17 U.S. Philips Corporation Matrix printer comprising lubricated printing wires
US4155229A (en) * 1976-02-27 1979-05-22 Mathias Mitter Printing apparatus
US4264219A (en) * 1978-05-31 1981-04-28 Copal Company Limited Device for driving dot printing bars in a dot printer
US4308794A (en) * 1978-07-13 1982-01-05 Contardo Adamoli Hammer assembly for a serial typing device

Also Published As

Publication number Publication date
NL149312B (en) 1976-04-15
CH423325A (en) 1966-10-31
DE1239874B (en) 1967-05-03
NL6508256A (en) 1965-12-30
GB1048514A (en) 1966-11-16

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