CA1229318A - Print wheel for multihammer impact printer - Google Patents
Print wheel for multihammer impact printerInfo
- Publication number
- CA1229318A CA1229318A CA000451287A CA451287A CA1229318A CA 1229318 A CA1229318 A CA 1229318A CA 000451287 A CA000451287 A CA 000451287A CA 451287 A CA451287 A CA 451287A CA 1229318 A CA1229318 A CA 1229318A
- Authority
- CA
- Canada
- Prior art keywords
- character
- platen
- angle
- print wheel
- 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
Links
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
- B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
- B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation
- B41J1/28—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers
- B41J1/30—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers with the types or dies moving relative to the carriers or mounted on flexible carriers
Landscapes
- Handling Of Sheets (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A print wheel for o multi hammer impact printer which includes at least two characters carried by each print wheel beam. The characters on each row are shaped such that when they are moved into contact with the print wheel platen, they will contact the platen uniformly.
A print wheel for o multi hammer impact printer which includes at least two characters carried by each print wheel beam. The characters on each row are shaped such that when they are moved into contact with the print wheel platen, they will contact the platen uniformly.
Description
93~
PRINT WHEEL FOR MULTI HAMMER IMPACT PRINTER
The invention relates to a print wheel for serial printing devices and particularly to high-speed serial printers having multiple print characters arranged on beams of a disc member.
There are two types of systems known wherein multiple characters are arranged in concentric circles on the disc. In the first, the disc is caused to move up or down relative to a horizontal line of printing depending on whether a character on lo the inner row or a character on the outer row of characters is to be printed. In the second, multiple print hammers are provided, one for each row of characters, and the axes of the characters in each row differ so that they are aligned correctly for printing at different rotational positions. This invention relates to an improvement in print wheels for the multiple hammer system.
The invention as claimed is intended to provide a multi character row print wheel which is relatively easy to mold as a one-piece plastic wheel, and wherein each row of characters and corresponding pads is formed to align accurately with the Face of the printer platen when impacted by its associated hammer.
An aspect of this invention is as follows:
A printwheel for a multi hammer impact printer having a platen, the printwheel comprising:
a disc hub, beams extending radially outwardly in a single common plane from said hub, at least two concentric circular rows of characters formed on said beams, each character having a pad portion and a printing surface portion, said pad portion of each character of at least one of said rows being oriented relative to said beams by a first angle and said printing surface portion of each character of said at least one of said rows lying in a first plane, and AL
-lo-said pad portion of each character of at least one other row being oriented relative to said beams by a second angle disposed at an angle X relative to said first angle and said printing surface portions of each character of said at least one of said rows lying in a second plane disposed at an angle Y to said first plane.
One way of carrying out the invention is described in detail below with reference to the drawing, which illustrates only one specific embodiment in which:
Figure 1 shows prior art character-beam relationships.
Figure 2 shows a partial plan view of a print wheel in accordance with this invention.
Figure 3 is a cross-sectional side view of the print wheel of Figure 2 taken along line 3-3.
Figure 4 is a top view of the print wheel of Figure
PRINT WHEEL FOR MULTI HAMMER IMPACT PRINTER
The invention relates to a print wheel for serial printing devices and particularly to high-speed serial printers having multiple print characters arranged on beams of a disc member.
There are two types of systems known wherein multiple characters are arranged in concentric circles on the disc. In the first, the disc is caused to move up or down relative to a horizontal line of printing depending on whether a character on lo the inner row or a character on the outer row of characters is to be printed. In the second, multiple print hammers are provided, one for each row of characters, and the axes of the characters in each row differ so that they are aligned correctly for printing at different rotational positions. This invention relates to an improvement in print wheels for the multiple hammer system.
The invention as claimed is intended to provide a multi character row print wheel which is relatively easy to mold as a one-piece plastic wheel, and wherein each row of characters and corresponding pads is formed to align accurately with the Face of the printer platen when impacted by its associated hammer.
An aspect of this invention is as follows:
A printwheel for a multi hammer impact printer having a platen, the printwheel comprising:
a disc hub, beams extending radially outwardly in a single common plane from said hub, at least two concentric circular rows of characters formed on said beams, each character having a pad portion and a printing surface portion, said pad portion of each character of at least one of said rows being oriented relative to said beams by a first angle and said printing surface portion of each character of said at least one of said rows lying in a first plane, and AL
-lo-said pad portion of each character of at least one other row being oriented relative to said beams by a second angle disposed at an angle X relative to said first angle and said printing surface portions of each character of said at least one of said rows lying in a second plane disposed at an angle Y to said first plane.
One way of carrying out the invention is described in detail below with reference to the drawing, which illustrates only one specific embodiment in which:
Figure 1 shows prior art character-beam relationships.
Figure 2 shows a partial plan view of a print wheel in accordance with this invention.
Figure 3 is a cross-sectional side view of the print wheel of Figure 2 taken along line 3-3.
Figure 4 is a top view of the print wheel of Figure
2 taken along line 4-4.
Figure PA is a top view showing greatly enlarged the relationship between the inboard and outboard print wheel hammers, characters and platen at rest, in dashed lines, and at the moment of printing.
Figure 5B is a top view showing greatly enlarged the relationship between the outboard print wheel hammer, outboard character and platen at rest, in dashed lines, and at the moment of impact.
Figure 6 is a side view showing an inboard character greatly ~2;~3~L~
enlarged at the moment of printing.
Figure 7 is a side view showing on outboard character greatly enlarged at the moment of printing.
Figure 8 shows a further character-beam relationship in 5 accordance with this invention.
The Figures ore not drown to scale, and certain features ore exaggerated in size for purposes of explanation.
Referring now to Figure 1, there are shown three prior art character bearing beams. Berm I is the standard print wheel beam that 10 carries one character 11 per beam. Beam 2 has two concentric circular rows of characters on it, the axis of each of the characters being aligned with the long axis of the berm. To print using a beam 2 type print wheel, a single print hummer is used, end the print wheel is Leonard or raised depending on whether a character from the inner (I lay or outer (I IBM row of characters is desired to 15 be printed. A print wheel with character bearing spokes such as beam 3 utilize two print hammers. The print wheel is rotated into the position shown in Figure I where the lower or inner character is to be printed. The print wheel is rotated in the plane of the disc until the outer character is aligned with the line of printing to print the outer character. The centers of characters I It 20 and I It are aligned on the long axis of the beam on which they are mounted.
An explqnqtion of how this print wheel can be used in a dual-hammer print wheel system is disclosed in US. Patent 4,û69,907, issued January 24, 1978.
Referring now to Figures 2-4, there is seen a print wheel disc designated generally as 5, which is made up of a hub 7 and extending 25 therefrom, a plurality of radially extending beams 9. Formed on beams 9 are inboard character pads I I a and outboard character pads I I b. It can be seen that beams 9 ore straight end that outboard character pads I It are formed at on angle to the beams 9. Structurally, it is preferred to have character pods I lo and I It formed such that their centers ore on the center of a straight 30 beam 9, but they may also have the arrangement shown in the above-mentioned potent or generally con be placed on a berm of any non-linear shape.
Drive means 13 is provided for rotating print wheel 5. Drive means 13 may be driven, for example, by a servo or stepper motor for rotating print 35 wheel 5 to align the desired character pad ha or fib as desired on line of printing 15. Print hammers aye and 17b shown as dashed circles in Figure 2 -Sue are provided to impact inboard character pods aye and outboard character pads l lb in line with line of printing 15, respectively. A platen 19 is provided against which printing occurs.
In operation, as print wheel S is moved along the line of printing 15 5 by carriage means (not shown), a controller (not shown) activates drive means 13, which rotates print wheel 5 unit! preselected character pad ha or fib is aligned with line of printing 15. The appropriate print hammer aye, 17b is then activated moving in the direction shown by arrow 21 toward the platen, impacting the preselected character pad ha or fib and driving it toward lo platen 19. A wedge back is provided on the pads carrying characters l lo and fib, and the hammers aye and i7b are V-notched correspondingly to ensure a proper capture even in the case of misalignment shammer to pad) due to manufacturing tolerances accumulation or print-on-the-fly technique.
Conventionally, a print ink ribbon (not shown) and a print receiving 5 member such as paper (not shown) are placed between the print wheel and platen 19 to effect printing. Depending on how much distance there is between hammers aye and 17b, it may be necessary to move the print wheel 5 relative to the platen 19 to space the printed characters evenly. Also, the controller can be programmed to type outboard characters out of sequence 20 since outboard characters are printed a number of spaces away from inboard characters so that print wheel 5 movement relative to platen 19 would proceed conventionally without the necessity for rapid back and forth movement.
While printing the inboard character l lay pure bending stress is induced in the beam 9. It has been found in this system that the beams 9 are 25 subject to either pure bending or bending and twisting during operation when the outboard character pads fib are printed, depending on the shape of the beam. The straight beam shown in Figure 2 is subject to bending only; and the beam 3, shaped as shown in Figure 1, is subject to both bending and torsion.
When outboard character pad l lb is impacted against platen 19~ because of its 30 offset position from the vertical centerline of the print wheel and also due to the bend or twist of bearing beam, the character 23b does not meet platen 19 exactly flush but meets instead at an angle, which can cause shaded printed characters.
In order to overcome the problem recited above, the outboard 35 character pads l lb and characters 23b formed thereon are designed to meet the platen 19 flush and yet allow the print wheel beams to be formed in a aye single plane, confining complex cutting angles to the character pads l lb and characters 23b only.
Referring now to Figures PA and 6, there is shown an inboard character pad I I a having character aye formed thereon. rho face of 5 character pad ha, which contacts print hammer aye, is formed as a male dihedral aye, which is shaped to mate with female dihedral aye in inboard print hammer aye. The purpose of the dihedral mating surfaces is to align and stabilize the character aye with reference to the platen 19 at the time of printing. The character pad 11 a and print hammer aye shown in dashed lines 10 represent the position of the character pad l lo and print hammer 17s~ in the"at rest" position; the solid lines represent the character pad ha and print hammer aye at the moment of printing.
It can be seen in connection with Figure PA that, as print hammer aye moves forward in direction 21, character 19 will be flush or strike at a IS right angle in relation to a radius of platen 19 at the time of impact as shown in Figures PA and 6. The impact surface aye is formed with a surface curvature to match the curve of the platen. It can be seen, however, that, where for example, the outboard character pad fib was seen in Figure) is driven toward the platen, the right hand and lower portions of character pad 20 1 by will impact the platen 19 first, causing a shaded printed character and beam 9 either bending (in the case of straight beam in Figure 2) or bending and twisting (when the beam has the shape of beam 3 depicted in Figure 1).
Referring now to Figures SUB and 7, there is shown, in accordance with this invention, a character pad l lb and character 23b designed to allow 25 character 23b to be presented flush to platen 19 at the moment of printing as shown in Figure 7.
Figure 5B shows in dashed lines the relationship between outboard character pad fib and outboard print hemmer 17b in the at rest position.
Outboard character pad l lb is provided with male dihedral 25b, and outboard 3û print hammer 17b is provided with female dihedral form 27b for alignment and stabilization of character 23b at the time of impact with platen 19. In order for the surface 29b of character 23b to be aligned with the platen 19 horizontally at the time of impact, character printing surface 29b is formed such that at rest it is aligned at a predetermined angle Y relative to platen 35 surface 19. For convenience in molding, outboard character pad l lb surface 31b is formed in the same plane as inboard character pad l lo surface aye.
2~93~L8 This plane is perpendicular to the axis of rotation of print wheels. The character pad i It is, however, formed it angle Y to the surface 31b. Then as print wheel 5 is moved toward platen 19 and constrained in an arc by berm 9, printing surface 29b wit! meet platen 19 flush as shown in solid line in Figure 5B. The bisecting line 33 of mule dihedral 25b of outboard pad l lb is formed also at angle Y to the axis of rotation of print wheel 5. This will enable the V-surface 27b of outboard hammer I It to properly engage the pod l lb at rest end drive it towards the platen 19 when printing so that the bisecting line 33 takes the final position 34 perpendicular to platen 19 at the lo moment of contact as shown in Figure EYE. Also, in order to have outboardcharacter surface 29b meet platen 19 flush vertically, it is necessary to provide a slant of printing surface 29b of angle X versus the surface 31b us shown in Figure 7. The superposition of cutting angles X, Y defines the spatial position of a plane tangent to the curved print surface of the character at restsuch that when impacting the platen, this surface will uniformly comply with the curvature of platen 19.
In a particularly preferred embodiment, the beams are spaced at
Figure PA is a top view showing greatly enlarged the relationship between the inboard and outboard print wheel hammers, characters and platen at rest, in dashed lines, and at the moment of printing.
Figure 5B is a top view showing greatly enlarged the relationship between the outboard print wheel hammer, outboard character and platen at rest, in dashed lines, and at the moment of impact.
Figure 6 is a side view showing an inboard character greatly ~2;~3~L~
enlarged at the moment of printing.
Figure 7 is a side view showing on outboard character greatly enlarged at the moment of printing.
Figure 8 shows a further character-beam relationship in 5 accordance with this invention.
The Figures ore not drown to scale, and certain features ore exaggerated in size for purposes of explanation.
Referring now to Figure 1, there are shown three prior art character bearing beams. Berm I is the standard print wheel beam that 10 carries one character 11 per beam. Beam 2 has two concentric circular rows of characters on it, the axis of each of the characters being aligned with the long axis of the berm. To print using a beam 2 type print wheel, a single print hummer is used, end the print wheel is Leonard or raised depending on whether a character from the inner (I lay or outer (I IBM row of characters is desired to 15 be printed. A print wheel with character bearing spokes such as beam 3 utilize two print hammers. The print wheel is rotated into the position shown in Figure I where the lower or inner character is to be printed. The print wheel is rotated in the plane of the disc until the outer character is aligned with the line of printing to print the outer character. The centers of characters I It 20 and I It are aligned on the long axis of the beam on which they are mounted.
An explqnqtion of how this print wheel can be used in a dual-hammer print wheel system is disclosed in US. Patent 4,û69,907, issued January 24, 1978.
Referring now to Figures 2-4, there is seen a print wheel disc designated generally as 5, which is made up of a hub 7 and extending 25 therefrom, a plurality of radially extending beams 9. Formed on beams 9 are inboard character pads I I a and outboard character pads I I b. It can be seen that beams 9 ore straight end that outboard character pads I It are formed at on angle to the beams 9. Structurally, it is preferred to have character pods I lo and I It formed such that their centers ore on the center of a straight 30 beam 9, but they may also have the arrangement shown in the above-mentioned potent or generally con be placed on a berm of any non-linear shape.
Drive means 13 is provided for rotating print wheel 5. Drive means 13 may be driven, for example, by a servo or stepper motor for rotating print 35 wheel 5 to align the desired character pad ha or fib as desired on line of printing 15. Print hammers aye and 17b shown as dashed circles in Figure 2 -Sue are provided to impact inboard character pods aye and outboard character pads l lb in line with line of printing 15, respectively. A platen 19 is provided against which printing occurs.
In operation, as print wheel S is moved along the line of printing 15 5 by carriage means (not shown), a controller (not shown) activates drive means 13, which rotates print wheel 5 unit! preselected character pad ha or fib is aligned with line of printing 15. The appropriate print hammer aye, 17b is then activated moving in the direction shown by arrow 21 toward the platen, impacting the preselected character pad ha or fib and driving it toward lo platen 19. A wedge back is provided on the pads carrying characters l lo and fib, and the hammers aye and i7b are V-notched correspondingly to ensure a proper capture even in the case of misalignment shammer to pad) due to manufacturing tolerances accumulation or print-on-the-fly technique.
Conventionally, a print ink ribbon (not shown) and a print receiving 5 member such as paper (not shown) are placed between the print wheel and platen 19 to effect printing. Depending on how much distance there is between hammers aye and 17b, it may be necessary to move the print wheel 5 relative to the platen 19 to space the printed characters evenly. Also, the controller can be programmed to type outboard characters out of sequence 20 since outboard characters are printed a number of spaces away from inboard characters so that print wheel 5 movement relative to platen 19 would proceed conventionally without the necessity for rapid back and forth movement.
While printing the inboard character l lay pure bending stress is induced in the beam 9. It has been found in this system that the beams 9 are 25 subject to either pure bending or bending and twisting during operation when the outboard character pads fib are printed, depending on the shape of the beam. The straight beam shown in Figure 2 is subject to bending only; and the beam 3, shaped as shown in Figure 1, is subject to both bending and torsion.
When outboard character pad l lb is impacted against platen 19~ because of its 30 offset position from the vertical centerline of the print wheel and also due to the bend or twist of bearing beam, the character 23b does not meet platen 19 exactly flush but meets instead at an angle, which can cause shaded printed characters.
In order to overcome the problem recited above, the outboard 35 character pads l lb and characters 23b formed thereon are designed to meet the platen 19 flush and yet allow the print wheel beams to be formed in a aye single plane, confining complex cutting angles to the character pads l lb and characters 23b only.
Referring now to Figures PA and 6, there is shown an inboard character pad I I a having character aye formed thereon. rho face of 5 character pad ha, which contacts print hammer aye, is formed as a male dihedral aye, which is shaped to mate with female dihedral aye in inboard print hammer aye. The purpose of the dihedral mating surfaces is to align and stabilize the character aye with reference to the platen 19 at the time of printing. The character pad 11 a and print hammer aye shown in dashed lines 10 represent the position of the character pad l lo and print hammer 17s~ in the"at rest" position; the solid lines represent the character pad ha and print hammer aye at the moment of printing.
It can be seen in connection with Figure PA that, as print hammer aye moves forward in direction 21, character 19 will be flush or strike at a IS right angle in relation to a radius of platen 19 at the time of impact as shown in Figures PA and 6. The impact surface aye is formed with a surface curvature to match the curve of the platen. It can be seen, however, that, where for example, the outboard character pad fib was seen in Figure) is driven toward the platen, the right hand and lower portions of character pad 20 1 by will impact the platen 19 first, causing a shaded printed character and beam 9 either bending (in the case of straight beam in Figure 2) or bending and twisting (when the beam has the shape of beam 3 depicted in Figure 1).
Referring now to Figures SUB and 7, there is shown, in accordance with this invention, a character pad l lb and character 23b designed to allow 25 character 23b to be presented flush to platen 19 at the moment of printing as shown in Figure 7.
Figure 5B shows in dashed lines the relationship between outboard character pad fib and outboard print hemmer 17b in the at rest position.
Outboard character pad l lb is provided with male dihedral 25b, and outboard 3û print hammer 17b is provided with female dihedral form 27b for alignment and stabilization of character 23b at the time of impact with platen 19. In order for the surface 29b of character 23b to be aligned with the platen 19 horizontally at the time of impact, character printing surface 29b is formed such that at rest it is aligned at a predetermined angle Y relative to platen 35 surface 19. For convenience in molding, outboard character pad l lb surface 31b is formed in the same plane as inboard character pad l lo surface aye.
2~93~L8 This plane is perpendicular to the axis of rotation of print wheels. The character pad i It is, however, formed it angle Y to the surface 31b. Then as print wheel 5 is moved toward platen 19 and constrained in an arc by berm 9, printing surface 29b wit! meet platen 19 flush as shown in solid line in Figure 5B. The bisecting line 33 of mule dihedral 25b of outboard pad l lb is formed also at angle Y to the axis of rotation of print wheel 5. This will enable the V-surface 27b of outboard hammer I It to properly engage the pod l lb at rest end drive it towards the platen 19 when printing so that the bisecting line 33 takes the final position 34 perpendicular to platen 19 at the lo moment of contact as shown in Figure EYE. Also, in order to have outboardcharacter surface 29b meet platen 19 flush vertically, it is necessary to provide a slant of printing surface 29b of angle X versus the surface 31b us shown in Figure 7. The superposition of cutting angles X, Y defines the spatial position of a plane tangent to the curved print surface of the character at restsuch that when impacting the platen, this surface will uniformly comply with the curvature of platen 19.
In a particularly preferred embodiment, the beams are spaced at
3.6 from one another providing room for Lou berms 9 on the circumference of hub 7. In Figure 2, the angular span 30 between two spokes 9 bearing pads 11 a 2û and l lb and aligned with line of printing 15 is 32.4. From the center of the hub 7 to the center of the character pads l lo on the inner character row is 1.4789 inches. The outer character fib centers are 1.7516 inches from the center of the disc. The outer characters fib are placed further out than geometrically required since the berms 9 become, in effect, shorter when bent by hummer 17 impact. Also, us shown in Figure 5B, the axis 33 of character pad l lb is offset from the axis 35 of print hammer 17b on angle Y of bout
4.05. This also is the angle Y that print surface 29b is formed in relationshipto surface 31b of character pad l lb us shown in Figure 5B. The angle shown in Figures 6 and 7 is designed to be 11.2; the angle X, 3.05; and the angle to be 8.15. The outboard hammer 17b is spaced nine intervals (or ten spokes) away from inboard print hammer aye, equivalent to 32.4 on the print wheel 5.
Referring now to Figure 8, the concept is subject to generalization to a print wheel with snore than two rows of characters and two printing hammers. In Figure 8 is depicted a print wheel with three rows. The three characters carried by the some berm are formed at different angles with the long axis of the berm. These Jingles along with the diameter of etch row, ~2~2~3~
ensure the proper spicing between characters when all three rows are used to print on the same line. Also, each row will hove its own Y and X angles built on fonts and pad wedge buck and, consequently, its own hammer angle 0.
Depending on design constraints (e.g., distance between print wheel and platen
Referring now to Figure 8, the concept is subject to generalization to a print wheel with snore than two rows of characters and two printing hammers. In Figure 8 is depicted a print wheel with three rows. The three characters carried by the some berm are formed at different angles with the long axis of the berm. These Jingles along with the diameter of etch row, ~2~2~3~
ensure the proper spicing between characters when all three rows are used to print on the same line. Also, each row will hove its own Y and X angles built on fonts and pad wedge buck and, consequently, its own hammer angle 0.
Depending on design constraints (e.g., distance between print wheel and platen
5 19), either both angles I Y or Only one of them can be equal to zero or a given row.
While the principles of the invention have been made clear in the illustrative embodiments, there will be many modifications in structure, arrangement, proportions, etc., which will occur to those skilled in the art.
10 For example, although this invention was described in connection with two character rows and two print hammers, obviously more than two character rows end print hammers could be used employing the same principles. Further, although the preferred print wheel beam in accordance with this invention is straight, the same principles of this invention would apply to the print wheels having beams such as shown in US. Patent 4,069,907 or of any other shape.
The appended claims are, therefore, intended to cover and embrace any such modifications within the scope and spirit of the invention.
While the principles of the invention have been made clear in the illustrative embodiments, there will be many modifications in structure, arrangement, proportions, etc., which will occur to those skilled in the art.
10 For example, although this invention was described in connection with two character rows and two print hammers, obviously more than two character rows end print hammers could be used employing the same principles. Further, although the preferred print wheel beam in accordance with this invention is straight, the same principles of this invention would apply to the print wheels having beams such as shown in US. Patent 4,069,907 or of any other shape.
The appended claims are, therefore, intended to cover and embrace any such modifications within the scope and spirit of the invention.
Claims
1. A printwheel for a multi hammer impact printer having a platen, the printwheel comprising:
a disc hub, beams extending radially outwardly in a single common plane from said hub, at least two concentric circular rows of characters formed on said beams, each character having a pad portion and a printing surface portion, said pad portion of each character of at least one of said rows being oriented relative to said beams by a first angle and said printing surface portion of each character of said at least one of said rows lying in a first plane, and said pad portion of each character of at least one other row being oriented relative to said beams by a second angle disposed at an angle X relative to said first angle and said printing surface portions of each character of said at least one of said rows lying in a second plane disposed at an angle Y to said first plane.
a disc hub, beams extending radially outwardly in a single common plane from said hub, at least two concentric circular rows of characters formed on said beams, each character having a pad portion and a printing surface portion, said pad portion of each character of at least one of said rows being oriented relative to said beams by a first angle and said printing surface portion of each character of said at least one of said rows lying in a first plane, and said pad portion of each character of at least one other row being oriented relative to said beams by a second angle disposed at an angle X relative to said first angle and said printing surface portions of each character of said at least one of said rows lying in a second plane disposed at an angle Y to said first plane.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US49745283A | 1983-05-23 | 1983-05-23 | |
| US497,452 | 1990-03-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1229318A true CA1229318A (en) | 1987-11-17 |
Family
ID=23976934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000451287A Expired CA1229318A (en) | 1983-05-23 | 1984-04-04 | Print wheel for multihammer impact printer |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0127361B1 (en) |
| JP (1) | JPS59225957A (en) |
| CA (1) | CA1229318A (en) |
| DE (1) | DE3476179D1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61152453A (en) * | 1984-12-26 | 1986-07-11 | Nec Corp | Impact type printer |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5264312A (en) * | 1975-11-21 | 1977-05-27 | Oki Electric Ind Co Ltd | High speed printer |
| JPS52134513A (en) * | 1976-05-01 | 1977-11-10 | Ricoh Kk | Petal type printing wheel |
| DE2756410A1 (en) * | 1977-12-17 | 1979-06-21 | Ibm Deutschland | High speed daisy wheel printer - in which hammers strike symbols at selected contact or crossing points of circles with print line |
| JPS57102358A (en) * | 1980-12-18 | 1982-06-25 | Ricoh Co Ltd | Type element |
| JPS5814753A (en) * | 1981-07-20 | 1983-01-27 | Ricoh Co Ltd | Type body for printer |
-
1984
- 1984-04-04 CA CA000451287A patent/CA1229318A/en not_active Expired
- 1984-05-11 EP EP19840303191 patent/EP0127361B1/en not_active Expired
- 1984-05-11 DE DE8484303191T patent/DE3476179D1/en not_active Expired
- 1984-05-16 JP JP9669884A patent/JPS59225957A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE3476179D1 (en) | 1989-02-23 |
| JPS59225957A (en) | 1984-12-19 |
| EP0127361A1 (en) | 1984-12-05 |
| EP0127361B1 (en) | 1989-01-18 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |