EP0049352A1 - Impact printer having readily replaceable rotary print member - Google Patents
Impact printer having readily replaceable rotary print member Download PDFInfo
- Publication number
- EP0049352A1 EP0049352A1 EP19810106440 EP81106440A EP0049352A1 EP 0049352 A1 EP0049352 A1 EP 0049352A1 EP 19810106440 EP19810106440 EP 19810106440 EP 81106440 A EP81106440 A EP 81106440A EP 0049352 A1 EP0049352 A1 EP 0049352A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hammer
- impact
- print member
- characters
- 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
Links
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J9/00—Hammer-impression mechanisms
- B41J9/02—Hammers; Arrangements thereof
- B41J9/04—Hammers; Arrangements thereof of single hammers, e.g. travelling along printing line
Definitions
- the present invention relates to impact printers wherein the print member is moved relative to the printing medium and impact printing is carried out at a plurality of print positions along a lateral line on said printing medium by moving said print member so that a selected type character on said print member coincides with a particular print position and then impacting said character against said print medium through a suitable ink release ribbon or sheet.
- printers which utilize rotating disks with characters arranged on the periphery thereof have been_ extensively used commercially. These printers generally fall into the daisy wheel class of printers in which print elements having a plurality of type characters respectively are mounted at the ends of a corresponding plurality of spokes or petals extending from a central hub.
- Patents US-A-4,178,108, 4,189,246, 3,858,509 and 4,044,880 are directed to impact printers using such print wheels.
- type-ball impact printers such as those described in Patents US-A3,703,230, 3,826,345, 3,924,726 and 3,618,735, the type-ball assembly itself serves both the function of character select and the impact hammer function. Because these type-ball impact printers contain no separate hammer assembly, font changing is relatively simple. On the other hand, because the type- balls have a self-contained relatively heavy hammer assembly, they can only operate at relatively low speeds because the high inertia of these relatively heavy balls substantially slows down the impact procedure. Type-ball impact printers generally operate in the order of from 15-30 cps while print wheel impact printers which have a much lower inertia because of the separation of the hammer assembly are capable of operations in the order of 60 cps or greater.
- Patent US-A-4,037,707 which shows the combination of a cup-shaped print wheel containing a plurality of type characters on fingers and a hammer assembly for driving selected ones of said characters against the printing medium.
- the curve of rotation of a selected character through the print position does not extend above the position. Rather, the curve is at a level or plane passing through the print position but not extending above.
- the hammer assembly extends above the print position. Consequently, the print element cannot be readily removed without manipulating the hammer assembly.
- This object of the present invention is realized by providing a print wheel impact printer having a separate hammer assembly wherein the print wheel may be removed and replaced without manipulating the hammer assembly.
- the present invention involves an improvement to the conventional print wheel impact printer wherein the print member or print wheel is mounted in a position whereat the curve of rotation formed by rotating each selected character through the print position extends above the print position.
- the print element can be conveniently mounted so that it extends above the print hammer assembly since the print hammer assembly is conventionally at or below the print position.
- the print wheel may be readily removed and/or inserted into the printer to change fonts.
- Step motor 15 is mounted on stanchion 16 of carrier 11 by bracket 17.
- Step motor 15 drives shaft 18 which in turn drives print member shaft 19 through universal joint 20.
- Shaft 19 is journaled in shaft bearing housing 21.
- Spherical print element 22 has a central elastic hub 23 which may be detachably received by a friction fit on stud 24 extending from shaft 19.
- central hub 23 has an orientation notch 42 which is aligned with and receives orientation finger 41 of arm 40 which is affixed to shaft 19.
- Print element 22 is comprised of a plurality of radial fingers or petals 25 extending from hub 23 to form a composite spherical shape.
- Type characters 27 are arrayed in a pair of concentric rows along the ends of petals 25.
- carrier 11 In order to carry out a printing operation, carrier 11 is moved along the print line past the print positions 26 on said print line. As the carrier 11 is being moved from print position to print position, the next type character 27 to be printed is selected from the peripheral array in the following manner. Let us assume that the character "B" is to be printed at the next print position.
- the control system for the print wheel which may be any standard print wheel control system, determines the row and petal position of the character "B". As indicated, shaft 19 is tiltable through an angle 6 by solenoid 28 which is activated to drive shaft 29 forward against housing tab 30 when print element 22 is being tilted clockwise around universal joint 20 to bring the inner row of type characters into coincidence with the print position 26 as shown in Fig. 2.
- solenoid 28 retracts shaft 29 which releases tab 30.
- shaft 19 and consequently print element 22 mounted thereon are urged counterclockwise by spring means 37 to rotate the print element 22 about universal joint 20 for an angle of e so that the outer row of type characters is in the print position. While the row of type characters is selected, the print element 22 is rotated to the selected character in that row in the conventional manner.
- carrier 11 In addition to carrying print wheel assembly 10, carrier 11 also carries impact hammer assembly 31.
- the assembly 31 which is shown diagrammatically may be any conventional impact hammer or missile assembly which can be mounted on the carrier 11 so that hammer 32 may be driven against print point 26.
- it consists of coil member 33 which is activated through the application of current by conventional means (not shown) during a firing cycle to attract actuator arm 34 and drive hammer 32 against selected character 27 on petal 25 which in turn drives ribbon 35 against paper 13 to imprint the selected character on the paper.
- coil 33 At the end of the hammer firing cycle, coil 33 is deactivated permitting actuator arm 34 which is spring loaded to be retracted by spring means 38. With arm 34 retracted, spring arm assembly 39 urges hammer 32 into the initial rest position shown in Fig. 2.
- print element 22 As print element 22 is rotated, type character 27 will be rotated in a curve of rotation which extends above print position 26. With this type of a positional arrangement, it may be seen that when it is necessary to change the font, a print element such as print element 22 may be readily removed and/or reinserted on stud 24 without any movement of impact hammer assembly 31.
Landscapes
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
Description
- The present invention relates to impact printers wherein the print member is moved relative to the printing medium and impact printing is carried out at a plurality of print positions along a lateral line on said printing medium by moving said print member so that a selected type character on said print member coincides with a particular print position and then impacting said character against said print medium through a suitable ink release ribbon or sheet.
- In accordance with the present state of the art, printers which utilize rotating disks with characters arranged on the periphery thereof have been_ extensively used commercially. These printers generally fall into the daisy wheel class of printers in which print elements having a plurality of type characters respectively are mounted at the ends of a corresponding plurality of spokes or petals extending from a central hub. Patents US-A-4,178,108, 4,189,246, 3,858,509 and 4,044,880 are directed to impact printers using such print wheels.
- Most present day impact printer operations require the use of multiple fonts, i.e., multiple print wheels each containing a somewhat different character font. With most print wheel impact printers of the type set forth above, font changing requires some manipulation. Unlike the type-ball impact printers which do not have separate hammer mechanism, in conventional standard print wheel impact printers it has been customary practice to provide some sort of means for getting the hammer assembly out of the way during removal or replacement of the print wheel.
- On the other hand, in the above-mentioned type-ball impact printers such as those described in Patents US-A3,703,230, 3,826,345, 3,924,726 and 3,618,735, the type-ball assembly itself serves both the function of character select and the impact hammer function. Because these type-ball impact printers contain no separate hammer assembly, font changing is relatively simple. On the other hand, because the type- balls have a self-contained relatively heavy hammer assembly, they can only operate at relatively low speeds because the high inertia of these relatively heavy balls substantially slows down the impact procedure. Type-ball impact printers generally operate in the order of from 15-30 cps while print wheel impact printers which have a much lower inertia because of the separation of the hammer assembly are capable of operations in the order of 60 cps or greater.
- Attention is also directed to Patent US-A-4,037,707 which shows the combination of a cup-shaped print wheel containing a plurality of type characters on fingers and a hammer assembly for driving selected ones of said characters against the printing medium. It should be noted that in this apparatus, the curve of rotation of a selected character through the print position does not extend above the position. Rather, the curve is at a level or plane passing through the print position but not extending above. As the structure of the patent indicates, the hammer assembly extends above the print position. Consequently, the print element cannot be readily removed without manipulating the hammer assembly.
- Accordingly, it is the object of the present invention to provide an impact printer wherein the print wheel is readily removable and replaceable but which still maintains the relatively low inertia and consequently high printing speeds of conventional print wheel impact printers.
- This object of the present invention is realized by providing a print wheel impact printer having a separate hammer assembly wherein the print wheel may be removed and replaced without manipulating the hammer assembly.
- The present invention involves an improvement to the conventional print wheel impact printer wherein the print member or print wheel is mounted in a position whereat the curve of rotation formed by rotating each selected character through the print position extends above the print position. In this manner, the print element can be conveniently mounted so that it extends above the print hammer assembly since the print hammer assembly is conventionally at or below the print position. Thus, positioned above the print assembly, the print wheel may be readily removed and/or inserted into the printer to change fonts.
- Referring now to the drawings, wherein a preferred embodiment of the invention is illustrated, and wherein like reference numerals are used throughout to designate like parts;
- Fig. 1 is a fragmentary generalized view of an impact printer in accordance with the present invention with appropriate sections broken away to illustrate the novel print member assembly structure of the present invention.
- Fig. 2 is a diagrammatic side view of the printer apparatus of Fig. 1 with selected portions sectioned in order to illustrate the structure of the present invention. In addition, Fig. 2 shows an additional diagrammatic standard expedient, i.e., the ribbon.
- In order to illustrate the operating concepts of the preferred embodiment in as simple a form as possible, structures in an impact printer which are standard in the art have been eliminated. First, with reference to Figs. 1 and 2, the
print member assembly 10 of the present invention will be illustrated as being mounted on acarrier 11 which is driven bylead screw 12 past a document such aspaper 13 mounted on aplaten 14. This lead screw carrier drive, details of which have been eliminated, may be any conventional lead screw carrier drive driven by an appropriate stepper motor which is well known in the art. -
Step motor 15 is mounted onstanchion 16 ofcarrier 11 bybracket 17.Step motor 15drives shaft 18 which in turn drivesprint member shaft 19 throughuniversal joint 20. Shaft 19 is journaled inshaft bearing housing 21.Spherical print element 22 has a centralelastic hub 23 which may be detachably received by a friction fit onstud 24 extending fromshaft 19. In order to insure thatprint element 22 is attached in the correct orientation,central hub 23 has anorientation notch 42 which is aligned with and receivesorientation finger 41 of arm 40 which is affixed toshaft 19. -
Print element 22 is comprised of a plurality of radial fingers orpetals 25 extending fromhub 23 to form a composite spherical shape.Type characters 27 are arrayed in a pair of concentric rows along the ends ofpetals 25. - In order to carry out a printing operation,
carrier 11 is moved along the print line past theprint positions 26 on said print line. As thecarrier 11 is being moved from print position to print position, thenext type character 27 to be printed is selected from the peripheral array in the following manner. Let us assume that the character "B" is to be printed at the next print position. The control system for the print wheel which may be any standard print wheel control system, determines the row and petal position of the character "B". As indicated,shaft 19 is tiltable through an angle 6 bysolenoid 28 which is activated to driveshaft 29 forward againsthousing tab 30 whenprint element 22 is being tilted clockwise arounduniversal joint 20 to bring the inner row of type characters into coincidence with theprint position 26 as shown in Fig. 2. When a selected character is in the outer peripheral row, thensolenoid 28 retractsshaft 29 which releasestab 30. Whentab 30 is thus released,shaft 19 and consequentlyprint element 22 mounted thereon are urged counterclockwise by spring means 37 to rotate theprint element 22 aboutuniversal joint 20 for an angle of e so that the outer row of type characters is in the print position. While the row of type characters is selected, theprint element 22 is rotated to the selected character in that row in the conventional manner. - In addition to carrying
print wheel assembly 10,carrier 11 also carriesimpact hammer assembly 31. Theassembly 31 which is shown diagrammatically may be any conventional impact hammer or missile assembly which can be mounted on thecarrier 11 so thathammer 32 may be driven againstprint point 26. In the structure shown, it consists ofcoil member 33 which is activated through the application of current by conventional means (not shown) during a firing cycle to attract actuator arm 34 and drivehammer 32 against selectedcharacter 27 onpetal 25 which in turn drivesribbon 35 againstpaper 13 to imprint the selected character on the paper. At the end of the hammer firing cycle,coil 33 is deactivated permitting actuator arm 34 which is spring loaded to be retracted byspring means 38. With arm 34 retracted,spring arm assembly 39 urgeshammer 32 into the initial rest position shown in Fig. 2. - In the preceding description of the present invention, all of the novel aspects of the structure have been described in detail. On the other hand, whatever would be standard to those skilled in the art has only been described in a limited fashion. The state of the art expedient for controlling the escapement, the hammer firing and character selection and for coordinating these two operations have been described in detail in prior art patents for example, Patents US-A-4,178,108 and 4,189,246 assigned to the assignee of the present invention.
- It should be noted that with the arrangement shown, as
print element 22 is rotated,type character 27 will be rotated in a curve of rotation which extends aboveprint position 26. With this type of a positional arrangement, it may be seen that when it is necessary to change the font, a print element such asprint element 22 may be readily removed and/or reinserted onstud 24 without any movement ofimpact hammer assembly 31. - While the invention has been particularly shown and described with reference to a preferred embodiment it will be understood by those skilled in the art that various other changes in form and detail may be made without departing from the spirit and scope of the invention.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US19388080A | 1980-10-03 | 1980-10-03 | |
US193880 | 1980-10-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0049352A1 true EP0049352A1 (en) | 1982-04-14 |
EP0049352B1 EP0049352B1 (en) | 1984-03-21 |
Family
ID=22715397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19810106440 Expired EP0049352B1 (en) | 1980-10-03 | 1981-08-19 | Impact printer having readily replaceable rotary print member |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0049352B1 (en) |
JP (1) | JPS5764556A (en) |
BR (1) | BR8106276A (en) |
DE (1) | DE3162811D1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59114935U (en) * | 1983-01-24 | 1984-08-03 | 三洋電機株式会社 | printing device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3738189A (en) * | 1971-06-15 | 1973-06-12 | Burroughs Corp | Tension releasing device |
-
1981
- 1981-07-20 JP JP11239881A patent/JPS5764556A/en active Pending
- 1981-08-19 DE DE8181106440T patent/DE3162811D1/en not_active Expired
- 1981-08-19 EP EP19810106440 patent/EP0049352B1/en not_active Expired
- 1981-09-30 BR BR8106276A patent/BR8106276A/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3738189A (en) * | 1971-06-15 | 1973-06-12 | Burroughs Corp | Tension releasing device |
Also Published As
Publication number | Publication date |
---|---|
EP0049352B1 (en) | 1984-03-21 |
JPS5764556A (en) | 1982-04-19 |
DE3162811D1 (en) | 1984-04-26 |
BR8106276A (en) | 1982-06-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4026403A (en) | Automatic printer with plurality of replaceable printing members | |
US4074798A (en) | Encoded print wheel system | |
US3168182A (en) | Type wheel shifting and impacting means in high speed printers | |
US4307969A (en) | Universal ribbon cartridge | |
JPS6438237A (en) | Printing method and device | |
EP0049352B1 (en) | Impact printer having readily replaceable rotary print member | |
US4203677A (en) | Printer ribbon lift assembly | |
US4464071A (en) | Detent apparatus for print wheel | |
CA1079669A (en) | Cup printer | |
CA1243625A (en) | Retractable pin sprocket wheel for model 5310 | |
ES8502915A1 (en) | Typing and erasing device for printing machines. | |
US3814010A (en) | Mechanism for double printing with a possibility for barring second printing | |
US4391536A (en) | Word processor print wheel assembly | |
US4411539A (en) | Print element with plural type layers of varying thickness | |
US4127336A (en) | Type heads | |
EP0075465A2 (en) | Print element shifter | |
US4345846A (en) | Impact printer with dual helix character print elements | |
US4902148A (en) | Typewriter with a print wheel and hammer driven by one motor | |
JPS584635B2 (en) | serial printer | |
EP0166290B1 (en) | Drive mechanism for a ribbon disc | |
EP0031401B1 (en) | Print velocity control apparatus for single element impact printers | |
JPS6341168Y2 (en) | ||
EP0038692A1 (en) | Print wheel aligning apparatus and rotary print wheel | |
JPH10147047A (en) | Printing selection device in two row printer | |
US4278357A (en) | Apparatus for controlling impression in a daisy wheel printer |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19810819 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 19840321 |
|
REF | Corresponds to: |
Ref document number: 3162811 Country of ref document: DE Date of ref document: 19840426 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: FR Ref legal event code: GC |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19930713 Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19930715 Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19930729 Year of fee payment: 13 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19940819 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19940819 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19950428 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19950503 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |