EP0127361A1 - Print wheel for impact printer - Google Patents
Print wheel for impact printer Download PDFInfo
- Publication number
- EP0127361A1 EP0127361A1 EP19840303191 EP84303191A EP0127361A1 EP 0127361 A1 EP0127361 A1 EP 0127361A1 EP 19840303191 EP19840303191 EP 19840303191 EP 84303191 A EP84303191 A EP 84303191A EP 0127361 A1 EP0127361 A1 EP 0127361A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- character
- characters
- print wheel
- platen
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
- B41J1/22—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
Definitions
- 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.
- the invention as claimed is intended to provide a multicharacter row print wheel which is relatively easy to mold as a one-piece plastics 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.
- Beam I is the standard print wheel beam that carries one character I 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 beam.
- a single print hammer is used, and the print wheel is lowered or raised depending on whether a character from the inner (11a) or outer (11b) row of characters is desired to 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 11a and 11b are aligned on the long axis of the beam on which they are mounted.
- beams 9 are straight and that outboard character pods 11b are formed at an angle to the beams 9.
- character pods 11a and 11b formed such that their centers are on the center of a straight beam 9, but they may also have the arrangement shown in the above- mentioned patent or generally can be placed on a beam 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 wheel 5 to align the desired character pad 11a or 11b as desired on line of printing 15.
- Print hammers 17a and 17b shown as dashed circles in Figure 2 are provided to impact inboard character pods 11a and outboard character pods 11b in line with line of printing 15, respectively.
- a platen 19 is provided against which printing occurs.
- a controller activates drive means 13, which rotates print wheel 5 until preselected character pad 11a or 11b is aligned with line of printing 15.
- the appropriate print hammer 17a, 17b is then activated moving in the direction shown by arrow 21 toward the platen, impacting the preselected character pad 11a or 11b and driving it toward platen 19.
- a wedgeback is provided on the pads carrying characters 11a and 11b, and the hammers 17a and 17b are V-notched correspondingly to ensure a proper capture even in the case of misalignment (hammer to pad) due to manufacturing tolerances accumulation or print-on-the-fly technique.
- a print ink ribbon (not shown) and a print-receiving member such as paper (not shown) are placed between the print wheel and platen 19 to effect printing.
- a print wheel and platen 19 Conventionally, a print ink ribbon (not shown) and a print-receiving member such as paper (not shown) are placed between the print wheel and platen 19 to effect printing.
- the controller can be programmed to type outboard characters out of sequence 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.
- the outboard character pads 11b 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 single plane, confining complex cutting angles to the character pods 11b and characters 23b only.
- FIG. 5A and 6 there is shown an inboard character pad 11a having character 23a formed thereon.
- the face of character pad 11a, which contacts print hammer 17a, is formed as a male dihedral 25a, which is shaped to mate with female dihedral 27a in inboard print hammer 17a.
- the purpose of the dinedral mating surfaces is to align and stabilize the character 23a with reference to the platen 19 at the time of printing.
- the character pad 11a and print hammer 17a shown in dashed lines represent the position of the character pad 11a and print hammer 17a in the "at rest" position; the solid lines represent the character pad 11a and print hammer 17a at the moment of printing.
- Figure 5B shows in dashed lines the relationship between outboard character pad 11b and outboard print hammer 17b in the at rest position.
- Outboard character pad 11b is provided with male dihedral 25b
- outboard 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.
- character printing surface 29b is formed such that at rest it is aligned at a predetermined angle Y relative to platen surface 19.
- outboard character pad 11b surface 31b is formed in the same plane as inboard character pad 11a surface 31a.
- This plane is perpendicular to the axis of rotation of print wheels.
- the character pad 11b is, however, formed at angle Y to the surface 31b. Then as print wheel 5 is moved toward platen 19 and constrained in an arc by beam 9, printing surface 29b will meet platen 19 flush as shown in solid line in Figure 5B.
- the bisecting line 33 of male dihedral 25b of outboard pad 11b 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 11b to properly engage the pad 11b at rest and 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 moment of contact as shown in Figure 5B.
- the beams are spaced at 3.6 0 from one another providing room for 100 beams 9 on the circumference of hub 7.
- the angular span 30 between two spokes 9 bearing pods 11a and 11b and aligned with line of printing 15 is 32.4°. From the center of the hub 7 to the center of the character pods 11a on the inner character row is 1.4789 inches.
- the outer character 11b centers are 1.7516 inches from the center of the disc. The outer characters 11b are placed further out than geometrically required since the beams 9 become, in effect, shorter when bent by hammer 17 impact.
- the axis 33 of character pad 11b is offset from the axis 35 of print hammer 17b an angle Y of about 4.05°. This also is the angle Y that print surface 29b is formed in relationship to surface 31b of character pad 11b as shown in Figure 58.
- 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 0 .
- the outboard hammer 17b is spaced nine intervals (or ten spokes) away from inboard print hammer 17a, equivalent to 32.4 0 on the print wheel 5.
- Figure 8 the concept is subject to generalization to a print wheel with more than two rows of characters and two printing hammers.
- a print wheel with three rows The three characters carried by the same beam are formed at different angles with the long axis of the beam. These angles, along with the diameter of each row, ensure the proper spacing between characters when all three rows are used to print on the same line.
- each row will have its own Y and X angles built on fonts and pad wedgeback and, consequently, its own hammer angle ⁇ .
- design constraints e.g., distance between print wheel and platen 19
- either both angles X, Y or only one of them can be equal to zero or a given row.
Abstract
Description
- 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 characters are arranged in two or more 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 the inner row or a character on the outer row of characters is to be printed. In the second, two or more 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 diffferent rotational positions. This invention relates to an improvement in print wheels for the system using more than one hammer.
- The invention as claimed is intended to provide a multicharacter row print wheel which is relatively easy to mold as a one-piece plastics 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.
- One way of carrying out the invention is described in detail below with reference to the drawings, which illustrate 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 of Fig. 2;
- Figure 4 is a top view of the print wheel of Figure 2 taken along line 4-4 of Fig. 2;
- Figure 5A 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 enlarged at the moment of printing.
- Figure 7 is a side view showing an outboard character greatly enlarged at the moment of printing.
- Figure 8 shows a further character-beam relationship in accordance with this invention.
- The Figures are not drawn to scale, and certain features are exaggerated in size for purposes of explanation.
- Referring now to Figure 1, there are shown three prior art character-bearing beams. Beam I is the standard print wheel beam that carries one character I 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 beam. To print using a beam 2 type print wheel, a single print hammer is used, and the print wheel is lowered or raised depending on whether a character from the inner (11a) or outer (11b) row of characters is desired to 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 ofcharacters 11a and 11b are aligned on the long axis of the beam on which they are mounted. An explanation of how this print wheel can be used in a dual-hammer print wheel system is disclosed in U.S. Patent 4,069,907. - 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 therefrom, a plurality of radially-extendingbeams 9. Formed onbeams 9 are inboard character pods 11a andoutboard character pods 11b. It can be seen thatbeams 9 are straight and thatoutboard character pods 11b are formed at an angle to thebeams 9. Structurally, it is preferred to havecharacter pods 11a and 11b formed such that their centers are on the center of astraight beam 9, but they may also have the arrangement shown in the above- mentioned patent or generally can be placed on a beam 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 rotatingprint wheel 5 to align the desiredcharacter pad 11a or 11b as desired on line ofprinting 15.Print hammers outboard character pods 11b in line with line ofprinting 15, respectively. Aplaten 19 is provided against which printing occurs. - In operation, as
print wheel 5 is moved along the line ofprinting 15 by carriage means (not shown), a controller (not shown) activates drive means 13, which rotatesprint wheel 5 until preselectedcharacter pad 11a or 11b is aligned with line ofprinting 15. Theappropriate print hammer arrow 21 toward the platen, impacting the preselectedcharacter pad 11a or 11b and driving it towardplaten 19. A wedgeback is provided on thepads carrying characters 11a and 11b, and thehammers - Conventionally, a print ink ribbon (not shown) and a print-receiving 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 betweenhammers print wheel 5 relative to theplaten 19 to space the printed characters evenly. Also, the controller can be programmed to type outboard characters out of sequence since outboard characters are printed a number of spaces away from inboard characters so thatprint wheel 5 movement relative toplaten 19 would proceed conventionally without the necessity for rapid back and forth movement. - While printing the inboard character 11a, pure bending stress is induced in the
beam 9. It has been found in this system that thebeams 9 are subject to either pure bending or bending and twisting during operation when theoutboard character pods 11b are printed, depending on the shape of the beam. The straight beam shown in Figure 2 is subject to bending only; and thebeam 3, shaped as shown in Figure 1, is subject to both bending and torsion. Whenoutboard character pad 11b is impacted againstplaten 19, because of its offset position from the vertical centerline of the print wheel and also because of the bend or twist of bearing beam, the character 23b does not meetplaten 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 character pads 11b and characters 23b formed thereon are designed to meet theplaten 19 flush and yet allow the print wheel beams to be formed in a single plane, confining complex cutting angles to thecharacter pods 11b and characters 23b only. - Referring now to Figures 5A and 6, there is shown an inboard character pad
11a having character 23a formed thereon. The face of character pad 11a, which contacts printhammer 17a, is formed as a male dihedral 25a, which is shaped to mate with female dihedral 27a ininboard print hammer 17a. The purpose of the dinedral mating surfaces is to align and stabilize thecharacter 23a with reference to theplaten 19 at the time of printing. The character pad 11a andprint hammer 17a shown in dashed lines represent the position of the character pad 11a and printhammer 17a in the "at rest" position; the solid lines represent the character pad 11a and printhammer 17a at the moment of printing. - it can be seen in connection with Figure 5A that, as
print hammer 17a moves forward indirection 21,character 19 will be flush or strike at a right angle in relation to a radius ofplaten 19 at the time of impact as shown in Figures 5A and 6. Theimpact surface 29a is formed with a surface curvature to match the curve of the platen. It can be seen, however, that, where, for example, theoutboard character pad 11b (as seen in Figure 2) is driven toward the platen, the right hand and lower portions ofcharacter pod 11b will impact theplaten 19 first, causing a shaded printed character andbeam 9 either bending (in the case of straight beam in Figure 2) or bending and twisting (when the beam has the shape ofbeam 3 depicted in Figure 1). - Referring now to Figures 5B and 7, there is shown, in accordance with this invention, a
character pad 11b and character 23b designed to allow character 23b to be presented flush toplaten 19 at the moment of printing as shown in Figure 7. - Figure 5B shows in dashed lines the relationship between
outboard character pad 11b andoutboard print hammer 17b in the at rest position.Outboard character pad 11b is provided with male dihedral 25b, andoutboard print hammer 17b is provided with femaledihedral form 27b for alignment and stabilization of character 23b at the time of impact withplaten 19. In order for thesurface 29b of character 23b to be aligned with theplaten 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 toplaten surface 19. For convenience in molding,outboard character pad 11b surface 31b is formed in the same plane as inboard character pad 11a surface 31a. This plane is perpendicular to the axis of rotation of print wheels. Thecharacter pad 11b is, however, formed at angle Y to the surface 31b. Then asprint wheel 5 is moved towardplaten 19 and constrained in an arc bybeam 9,printing surface 29b will meetplaten 19 flush as shown in solid line in Figure 5B. Thebisecting line 33 of male dihedral 25b ofoutboard pad 11b is formed also at angle Y to the axis of rotation ofprint wheel 5. This will enable the V-surface 27b ofoutboard hammer 11b to properly engage thepad 11b at rest and drive it towards theplaten 19 when printing, so that thebisecting line 33 takes thefinal position 34 perpendicular to platen 19 at the moment of contact as shown in Figure 5B. Also, in order to haveoutboard character surface 29b meetplaten 19 flush vertically, it is necessary to provide a slant ofprinting surface 29b of angle X versus the surface 31b as 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 rest such that when impacting the platen, this surface will uniformly comply with the curvature ofplaten 19. - In a particularly preferred embodiment, the beams are spaced at 3.60 from one another providing room for 100
beams 9 on the circumference ofhub 7. In Figure 2, theangular span 30 between twospokes 9bearing pods 11a and 11b and aligned with line ofprinting 15 is 32.4°. From the center of thehub 7 to the center of the character pods 11a on the inner character row is 1.4789 inches. Theouter character 11b centers are 1.7516 inches from the center of the disc. Theouter characters 11b are placed further out than geometrically required since thebeams 9 become, in effect, shorter when bent by hammer 17 impact. Also, as shown in Figure 5B, theaxis 33 ofcharacter pad 11b is offset from the axis 35 ofprint hammer 17b an angle Y of about 4.05°. This also is the angle Y that printsurface 29b is formed in relationship to surface 31b ofcharacter pad 11b as shown in Figure 58. The angle θ shown in Figures 6 and 7 is designed to be 11.2°; the angle X, 3.05°; and the angle φ to be 8.150. Theoutboard hammer 17b is spaced nine intervals (or ten spokes) away frominboard print hammer 17a, equivalent to 32.40 on theprint wheel 5. - Referring now to Figure 8, the concept is subject to generalization to a print wheel with more 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 same beam are formed at different angles with the long axis of the beam. These angles, along with the diameter of each row, ensure the proper spacing between characters when all three rows are used to print on the same line. Also, each row will have its own Y and X angles built on fonts and pad wedgeback and, consequently, its own hammer angle φ. Depending on design constraints (e.g., distance between print wheel and platen 19), either both angles X, 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. For example, although this invention was described in connection with two character rows and two print hammers, obviously more than two character rows and print hammers could be used employing the some principles. Further, although the preferred print wheel beam in accordance with this invention is straight, this invention would apply to print wheels having beams such as shown in U.S. Patent 4,069,907 or of any other shape.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US49745283A | 1983-05-23 | 1983-05-23 | |
US497452 | 1983-05-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0127361A1 true EP0127361A1 (en) | 1984-12-05 |
EP0127361B1 EP0127361B1 (en) | 1989-01-18 |
Family
ID=23976934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840303191 Expired EP0127361B1 (en) | 1983-05-23 | 1984-05-11 | Print wheel for 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 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4069907A (en) * | 1975-11-21 | 1978-01-24 | Oki Electric Industry Co., Ltd. | High speed printer having spokes with a plurality of sections connected together at an angle greater than zero |
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 |
US4335970A (en) * | 1976-05-01 | 1982-06-22 | Ricoh Company, Ltd. | Type wheel for serial printing apparatus |
DE3145021A1 (en) * | 1981-07-20 | 1983-02-03 | Ricoh Co., Ltd., Tokyo | TYPE CARRIERS |
US4411539A (en) * | 1980-12-18 | 1983-10-25 | Ricoh Company, Ltd. | Print element with plural type layers of varying thickness |
-
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
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4069907A (en) * | 1975-11-21 | 1978-01-24 | Oki Electric Industry Co., Ltd. | High speed printer having spokes with a plurality of sections connected together at an angle greater than zero |
US4335970A (en) * | 1976-05-01 | 1982-06-22 | Ricoh Company, Ltd. | Type wheel for serial printing apparatus |
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 |
US4411539A (en) * | 1980-12-18 | 1983-10-25 | Ricoh Company, Ltd. | Print element with plural type layers of varying thickness |
DE3145021A1 (en) * | 1981-07-20 | 1983-02-03 | Ricoh Co., Ltd., Tokyo | TYPE CARRIERS |
Also Published As
Publication number | Publication date |
---|---|
CA1229318A (en) | 1987-11-17 |
DE3476179D1 (en) | 1989-02-23 |
JPS59225957A (en) | 1984-12-19 |
EP0127361B1 (en) | 1989-01-18 |
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