EP0128558A2
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EP
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Ink dot printer
Assignee: Toshiba TEC Corp
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Filing: 1984-06-08
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Granted: —
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Expires: 2004-06-08
Abstract
Abstract An ink dot printer to form dots of magnetic ink on a recording paper (84) on a platen (86) so as to print thereon symbols such as characters or numerals by the grouping of these dots comprises stoppers (90) which collide with needles (62) in the course of their moving from a first position where their one end portions (64) are immersed in a magnetic ink film (88) formed in a slit (34) between a pair of magnetic pole plates (26, 28) to stop the needles at a second position where their one end portions are projected from the film, and the driving force produced in electromagnets (74) for driving the needles from the first to the second position is so set that the magnetic ink (60) is splashed from the one end portions onto a recording paper (84) on a platen (86), thanks to inertia in the magnetic ink which is caused when the needles collide with the stoppers.
Inventors
- 👤 Shizuko Kimura
- 👤 Takeyoshi Tsuge
- 👤 Yoshihiro Torisawa
- 👤 Ayumu Makino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 17:55
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/305; B41J2/235; B41J2/25; B41J2/255
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
340 words
An ink dot printer comprising a means (36) for storing magnetic ink (60); a pair of magnetic pole plates (26, 28) arranged opposite to each other to form a slit (34) whose one end is immersed in the magnetic ink supplied from the magnetic ink storing means; a magnetism generating means (24) for magnetizing the paired magnetic pole plates to introduce the magnetic ink supplied from the magnetic ink storing means into the slit to form a magnetic ink film (88) therein; a plurality of needles (62) arranged adjacent to one another along the longitudinal direction of the slit where each is freely movable in its longitudinal direction between a first position where its one end portion is immersed in the magnetic ink film in the slit formed by the paired magnetic pole plates and a second position where its one end portion is projected from the magnetic ink film in the slit; and a driving means (74) for selectively driving the needles to move from the first position to the second position, wherein one or more needles as selected force the magnetic ink, which has been stuck on their one end faces of the one end portions at the first position, onto a recording paper (84) on a platen (86) at the second position to form dots of the magnetic ink on the recording paper so as to print thereon symbols such as characters or numerals by the grouping of these dots; characterized in that end faces of one end portions (64) of the needles (62) located at the second position are separated from the recording paper (84) on the platen (86) by a distance greater than the thickness of the magnetic ink (60) on each of the end faces, and characterized by a magnetic ink flying means for flying the magnetic ink (60) from the end faces of the one end portions (64) of the needles (62) located at the second position onto the recording paper (84) on the platen (86) to force the magnetic ink (60) thereon.
Claim 2
Dependent Claim
340 words
An ink dot printer comprising a means (36) for storing magnetic ink (60); a pair of magnetic pole plates (26, 28) arranged opposite to each other to form a slit (34) whose one end is immersed in the magnetic ink supplied from the magnetic ink storing means; a magnetism generating means (24) for magnetizing the paired magnetic pole plates to introduce the magnetic ink supplied from the magnetic ink storing means into the slit to form a magnetic ink film (88) therein; a plurality of needles (62) arranged adjacent to one another along the longitudinal direction of the slit where each is freely movable in its longitudinal direction between a first position where its one end portion is immersed in the magnetic ink film in the slit formed by the paired magnetic pole plates and a second position where its one end portion is projected from the magnetic ink film in the slit; and a driving means (74) for selectively driving the needles to move from the first position to the second position, wherein one or more needles as selected force the magnetic ink, which has been stuck on their one end faces of the one end portions at the first position, onto a recording paper (84) on a platen (86) at the second position to form dots of the magnetic ink on the recording paper so as to print thereon symbols such as characters or numerals by the grouping of these dots; characterized in that end faces of one end portions (64) of the needles (62) located at the second position are separated from the recording paper (84) on the platen (86) by a distance greater than the thickness of the magnetic ink (60) on each of the end faces, and characterized by a magnetic ink flying means for flying the magnetic ink (60) from the end faces of the one end portions (64) of the needles (62) located at the second position onto the recording paper (84) on the platen (86) to force the magnetic ink (60) thereon.
Claim 3
Dependent Claim
44 words
An ink dot printer according to claim 1, characterized in that the magnetic ink flying means has a magnet located on the side of the platen (86) which is opposite to the end faces of the one end portions (64) of the needles (62).
Claim 4
Dependent Claim
18 words
An ink dot printer according to claim 2, characterized in that said magnet is a magnetized platen (86).
Claim 5
Dependent Claim
36 words
An ink dot printer according to claim 2, characterized in that the needles (62) are stopped at the second position when they collide with stoppers (90) in the course of their moving from the first position.
Claim 6
Dependent Claim
18 words
An ink dot printer according to claim 4, characterized in that said magnet is a magnetized platen (86).
Claim 7
Dependent Claim
85 words
An ink dot printer according to claim 4, characterized in that armatures (76) which follow the needle (62) moving between the first and second positions are attached to the other end portions of the needles (62), the driving means includes electromagnets (74) to selectively draw the armatures to selectively move the needles from the first to the second position, and the armatures collide with the stoppers (90) to stop the needles at the second position in the course of their moving from the first position.
Claim 8
Dependent Claim
18 words
An ink dot printer according to claim 6, characterized in that said magnet is a magnetized platen (86).
Claim 9
Dependent Claim
21 words
An ink dot printer according to claim 6, characterized in that said stoppers are the cores (90) of the electromagnets (74).
Claim 10
Dependent Claim
18 words
An ink dot printer according to claim 8, characterized in that said magnet is a magnetized platen (86).
Claim 11
Dependent Claim
60 words
An ink dot printer according to claim 2, characterized in that the needles (62) can be stopped at the second position without applying any external force to them in the course of their moving from the first position by setting the mass of each of them a predetermined value corresponding to the predetermined driving force applied from the driving means.
Claim 12
Dependent Claim
18 words
An ink dot printer according to claim 10, characterized in that said magnet is a magnetized platen (86).
Claim 13
Dependent Claim
84 words
An ink dot printer according to claim 10, characterized in that armatures (76) movable in the movement direction of the needles (62) are disposed depending on the positions of the other ends of the respective needles, and the driving means includes an electromagnets (74) to selectively draw the armatures to selectively move the needles from the first to the second position, the magnitude of the driving force of the driving means being adjusted by the magnitude of the magnetic force generated by the electromagnets.
Claim 14
Dependent Claim
107 words
An ink dot printer according to claim 1, characterized in that the needles (62) are stopped at the second position by their collision with the stoppers (90) in the course of their moving from the first position, and the magentic ink flying means is constructed by setting the driving force of the driving means (74) in such a way that the magnetic ink is splashed from the end faces of their one end portions onto the recording paper (84), thanks to that inertia in the magnetic ink (60) on the end faces of their one end portions (64) which is caused when they collide with the stoppers.
Claim 15
Dependent Claim
85 words
An ink dot printer according to claim 13, characterized in that armatures (76) which follow the needles (62) moving between the first and second positions are attached to the other end portions of the needles (62), the driving means includes electromagnets (74) to selectively draw the armatures to selectively move the needles from the first to the second position, and the armatures collide with the stoppers (90) to stop the needles at the second position in the course of their moving from the first position.
Claim 16
Dependent Claim
21 words
An ink dot printer according to claim 14, characterized in that said stoppers are the cores (90) of the electromagnets (74).
Claim 17
Dependent Claim
31 words
An ink dot printer according to claim 14, characterized in that the driving force of said driving means is adjusted by the magnitude of the magnetic force generated by the electromagnets.
Claim 18
Dependent Claim
21 words
An ink dot printer according to claim 16, characterized in that said stoppers are the cores (90) of the electromagnets (74).
References Cited (Backward Citations)
No citation records indexed.
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