EP0013719A1 - Typenscheibe mit Kassette - Google Patents

Typenscheibe mit Kassette Download PDF

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Publication number
EP0013719A1
EP0013719A1 EP79104880A EP79104880A EP0013719A1 EP 0013719 A1 EP0013719 A1 EP 0013719A1 EP 79104880 A EP79104880 A EP 79104880A EP 79104880 A EP79104880 A EP 79104880A EP 0013719 A1 EP0013719 A1 EP 0013719A1
Authority
EP
European Patent Office
Prior art keywords
printing
cartridge
hub
recess
printing 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.)
Granted
Application number
EP79104880A
Other languages
English (en)
French (fr)
Other versions
EP0013719B1 (de
Inventor
Adolph Broaddus Habich
Ronald Eugene Hunt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lexmark International Inc
Original Assignee
International Business Machines Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0013719A1 publication Critical patent/EP0013719A1/de
Application granted granted Critical
Publication of EP0013719B1 publication Critical patent/EP0013719B1/de
Expired legal-status Critical Current

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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
    • B41J1/246—Cartridges for the carriers

Definitions

  • the present invention relates generally to printers with a print wheel with radial character tabs and more particularly it relates to a particular structure of such a print wheel designed to be housed and positioned in a cartridge both during its storage and use in a printer.
  • the present invention relates to a print element or wheel of the type with radial character tabs which can be housed in a cartridge and removed from it.
  • the printing element and the cartridge form a printing assembly which can be stored, shipped, etc. and used for printing in a printer.
  • the printing element has a side struck by the hammer of the printer and a printing side and is basically composed of a central hub supporting radial tabs which bear printing characters at their free ends. When a tab of the printing member is struck by the hammer, the character mounted on the printing side of the tab is driven against a recording medium where it is printed.
  • the central hub is cup-shaped and its projecting side is on the struck side of the printing element.
  • the projecting side of the central hub has a relief element (also referred to hereinafter as "positioning element") in relief having a stabilizing surface.
  • the orientation element is intended to engage in a corresponding opening of the cartridge to maintain the printing element in a desired angular position.
  • the stabilization surface is intended to bear against a corresponding surface of a drive hub of a selection motor to stabilize the printing element.
  • the relief orientation element has a recess which has an opening radially offset from the axis of rotation of the printing element. Also found in the recess is a cylindrical crown centered on the axis of rotation of the printing element.
  • the open radially offset is provided to receive a centering finger of a drive hub and the central bore of the crown is provided to receive the drive shaft of a selection motor, passing through the drive hub .
  • the drive shaft has no play in the bore of the crown and the depth of this bore is sufficient to allow said stabilization surfaces to be in contact without the drive shaft coming into contact. contact with the bottom of the crown bore.
  • In the center of the hollow side of the central hub there is a raised part which serves both as a cam follower and as a bearing.
  • a curved flexible blade is disposed in the cartridge.
  • the drive hub rests on the printing element, the orientation element then being released from the opening receiving it, to allow rotation of said printing element.
  • the central raised part located on the hollow side of the hub rests and turns on the spring which acts as a bearing.
  • the central hub described here is in the form of a cup, the outside of which is turned on the striking side of the printing wheel.
  • This character teristics offers the following advantages: the overall printing wheel can be relatively thin while resisting warping; the print wheel being thin, the problems associated with its mass are reduced; when the print wheel is housed in a cartridge during a storage period or in use on a machine, the tabs are not in contact with the adjacent surface of the cartridge and the surface of the print wheel in contact with the cartridge, is minimized during storage.
  • the outer face of the central hub of the device of the present invention carries a projecting positioning element.
  • This positioning element as said above is intended to engage in a corresponding cutout formed in the cartridge to lock the print wheel in an angular position required by the printer.
  • the hub structure allows the stabilization of the printing wheel as mentioned above, as well as the reduction of the mass of the printing wheel thanks to the recess formed in the positioning element. .
  • FIG. 1 the cartridge is referenced 1, the printing wheel 2 and the drive hub of the selection motor 3. Only the printing element is part of the invention claimed below. During the printing operations, the printing element 2 is housed and rotated in the cartridge 1 by the drive hub 3.
  • the motor Before this assembly, the motor must however be removed or tilted to leave sufficient free space in the region of the printing device, allowing the operator to change or install the printing element. Even in this case, the space freed up is not important and the operation can prove to be very messy. Even after these disassembly and reassembly operations have been carried out, the simple manipulation of the printing element which has been removed from the machine can be very messy.
  • the printing element of the present invention is designed so that it can be housed in and removed from a cartridge, which provides substantial assistance in solving the problems indicated above.
  • the space to be freed in the area of the printing device is no longer a critical factor since the cartridge containing the printing element is designed to be introduced vertically into a printer. .. Furthermore, since the printing element is practically entirely contained in the cartridge, changing the cartridge is no longer a messy operation.
  • the housing 4 has a front face 6 in which are formed a positioning opening 7 and a cutout 8 for the passage of a hammer.
  • the front face 6 is arranged opposite a printing device which comprises a selection motor and a striking hammer carried by a printer carriage.
  • the cutout 8 allows the passage of the hammer which is used in a well known manner to ensure printing.
  • the positioning opening 7 has somewhat the shape of an arrow head and is formed approximately in the center of the face 6.
  • the opening . 7 cooperates with the printing element 2 to ensure and maintain an appropriate positioning of the printing element 2 when the cartridge is not in use, as will be described later.
  • the cartridge 1 has an open bottom used for the introduction and the withdrawal of the printing element 2.
  • cut corners 13 and 14 and the corresponding cut corners. of the rear face 5 have two functions. All first these cut corners reduce the weight of the cartridge which is carried by the printer carriage during printing operations. Then, they guide the cartridge in its housing in the carriage when said cartridge is introduced into the machine.
  • the upper part of the front housing 4 has two ramp sections 16 and 17 starting from the recesses 11 and 12 and converging towards the raised central part of the housing 4 in which the cutout 8 is formed which has lateral sides 18 and 19 and a lower side 20.
  • the dimensions of the cutout 8 are such that they allow the passage of a striking hammer during printing, but practically prevent any manual contact of the printing element 2 by the operator.
  • the ramp sections 16 and 17 protect the upper part of the printing element 2 when it is housed in the cartridge and ensure the best possible vision of the writing line.
  • the housing 4 carries the ribbon guide 21 which can be produced from a suitably shaped metal rod. Passing momentarily to FIG. 3, it can be seen that the housing body 4 has supports 22 and 23 in which the ends of the ribbon guide are fixed.
  • the ribbon guide 21 guides the printing ribbon during the passages of this last towards its high or low position relative to the cutout 8 during the printing operations.
  • a paper guide screen 24 is integral with the upper part of the rear face 5.
  • a printing window 25 is centered horizontally in the guide paper 24 and aligned with the cutout 8.
  • the window 25 must be arranged so that it can be aligned with the platen of the printer and must have a sufficient width for, when performing printing operations at the stolen, allow the rebound of a print character tab without it coming into contact with one side of the window 25. While satisfying these requirements, the window 25 must be of sufficiently small dimensions to limit operator access to the printing element 2.
  • the front face 6 and the rear face 5 are close enough to limit operator access to the printing element 2 by the top or bottom of the cartridge 1. Therefore, when the printing element 2 is housed in the cartridge 1, the only part of said printing element which can be touched by the operator during normal handling of the cartridge is the part accessible through the opening 7.
  • the printing element 2 which, as indicated above, is intended to be housed and rotated in the cartridge 1 during the printing operations. When it is rotated, the printing element 2 is placed midway between the front 6 and rear 5 sides of the cartridge 1.
  • the printing element 2 consists of a central hub 26 at which are attached to the radial tabs or petals 27 which bear at their outer ends of the printing characters 28 used for printing in a well known manner.
  • the characters 28 of the tabs 27 are arranged on the printing side of the element 2.
  • the opposite side is the side impact. On the impact side, the structure of the tongues 27 is such that it allows them to be struck by a striking hammer.
  • the central hub 26 is in the form of a circular cup having a peripheral flange 55 to which are attached the tongues 27.
  • the hub 26 has, on its convex face, a raised element 29 ensuring the correct positioning (or orientation) of the element 2.
  • This relief element 29 is therefore on the impact side of the element 2, surrounds its axis of rotation and its periphery is in the shape of an arrowhead and corresponds to the shape of the opening 7 of the cartridge 1.
  • the element in relief 29 can fit into the opening 7.
  • the asymmetrical shapes of the element in relief 29 and the opening 7 ensure the installation of the element 2 in the cartridge 1 in the appropriate angular position.
  • a circular recess 30 is formed in the relief element 29.
  • the axis of rotation of the element 2 passes through the center of this recess, the bottom of which is constituted by the hub 26.
  • This recess 30 also has a radial extension 43 At the center of the recess 30, there is a ring 31 with an inner bowl 32 having a bottom 33.
  • the bowl 32 is centered on the axis of rotation of the element 2 (see FIG. 6) and is deeper than the 'depression 30.
  • the cup 32 is intended to receive the drive shaft of a selection motor which passes through the hub 3 to center and avoid the buckling of the element 2 in a manner which will be described in detail later.
  • the drive hub 3 is formed by a cylinder 34 with a flange 35.
  • a central D-shaped passage 36 passes axially through the cylinder 34 and the flange 35.
  • the passage 36 receives the drive shaft 37, corresponding form, of a selection engine.
  • the shape of the passage 36 and of the shaft 37 allows the latter to rotate the hub 3.
  • the hub 3 can be glued to the shaft 37. If the fitting of the shaft 37 in the passage 32 is sufficiently tight and sufficiently deep, the element 2 is stabilized in a radial direction perpendicular to its axis of rotation. That is to say, any risk of the element 2 becoming clouded is considerably reduced. Since the front 6 and rear 5 faces of the cartridge are very close together, any warping of the element 2 on the shaft 37 would cause wear, breakage and braking when the said printing element rotates.
  • the flange 35 carries a radial arm 39 which itself carries at its outer end a drive finger 40 designed to be housed in the hole 41 ( Figure 2) formed in the element 2.
  • the hole 41 is formed in the end of the extension 43 of the recess 30 and passes through the element 2.
  • the finger 40 introduced into the hole 41, when the hub 36 is driven in rotation by the shaft 37, causes the drive in rotation of the element 2.
  • the finger 40 and the hole 41 are of corresponding shapes, that is to say on two straight sides connected by two parts in an arc.
  • the width of the hole 41 is only slightly greater than that of the finger 40 in order to reduce the clearance between the element 2 and the hub 3 during the driving in rotation of the element 2 by the hub 3. However, in order to compensate for variations in tolerances, the height of the hole 41 slightly exceeds that of the finger 40.
  • the flat sides of these two elements constitute sufficient driving contact surfaces making it possible to reduce wear and indentation.
  • the rigidity of the arm 39 is increased by the rib 42.
  • the extension 43 of the depression 30 is wide enough to receive, without friction, the rib 42.
  • the outside diameter of the flange 35 is larger than the inside diameter 44 of the recess 30.
  • the surface 45 of the flange 35 bears against the surface of the raised element 29 to ensure radial alignment and stabilization of element 2 in order to further reduce the risks of warping.
  • Good contact between the surface 45 and the corresponding surface of the raised element 29 is facilitated by the spring 48 which applies the element 2 against the hub 3.
  • the function of the spring 48 will be described in more detail below.
  • the shape of the recess 30 has the effect of reducing the weight of the element 2.
  • the internal part of the collar 35 is hollowed out to reduce the weight. Any reduction in weight results in an improved response time with regard to starting and stopping the rotation of element 2.
  • FIG. 2 shows the rear face or printing face 56 of the printing element 2.
  • the rear face 56 carries a stud 46 placed at the center of the depression 47 of the hub 26.
  • the stud 46 extends slightly beyond the plane of the tongues 27 and is designed to operate in association with the spring 48 disposed in the cartridge 1 ( Figures 1 and 3).
  • the stud 46 is composed of a cylindrical part 49 ending in a spherical section 50.
  • the spherical section 50 acts as a bearing for the element 2 against the flexible blade or spring 48 during the rotation of the element 2.
  • the spring 48 bears against the spherical section 50 and maintains the element 2 in the locked condition in the cartridge 1.
  • the spring 48 is a flexible blade with a curved central part 51 oriented towards the opening 7 and facing the latter. This curved part 51 bears against the interior surface of the front face 6 of the cartridge.
  • the rear face 5 has a rectangular recess 52 which receives and maintains the spring 48 in a desired position relative to the opening 7. That is to say that the spring 48 will remain in place and oriented correctly both when it is curved as shown in the figures and when it is loaded and deformed by the printing element contained in the cartridge 1 between the spring 48 and the front face 6.
  • the ends 57 and 58 of the spring 48 are housed in the recess 52 and are supported on the inner surface of the rear face 5.
  • the recess 52 is long enough to receive the spring 48 when the latter is loaded and deformed by the printing element and the spring 48 is sufficiently long to ensure a gradual ramp.
  • the ends 57 and 58 are retained in the recess 52 by the contact between the front face 6 of the cartridge and the curved part 51 of the spring 48.
  • the orientation and the length of the spring 48 and the extent of the part curved 51 are such that the spring 48 acts as a ramp for the spherical end 50 of the stud 46 of the element 2, in order to guide the element in relief 29 towards the opening 7 during the introduction of the element 2 in cartridge 1.
  • the force exerted by the spring 48 must be surpassed.
  • the spherical end 50 of the stud 46 moves on the curved part 51.
  • the end 57 of the spring 48 being housed in the recess 52, there will be no no attachment between the part 50 and the end 57.
  • the spring 48 pushes and guides the element 29 into the opening 7.
  • the element 29 engages in the opening 7 this causes the locking of the element 2 in the desired orientation or angular position in the cartridge 1.
  • the printing assembly formed of the element 2 and of cartridge 1 is ready for use on a printer or stored.
  • the width of the spring 48 is of great importance for the introduction of a printing element into an empty cartridge.
  • the width of the spring 48 must be sufficient to prevent the passage of a printing tab 27 through the opening 7 during the introduction of the element 2 into the cartridge 1. If the spring 48 is comparatively narrow with respect to at the opening 7, the tongues may be offset from the plane of all the tongues. To eliminate this risk, the spring 48 of the embodiment illustrated here is wider than the opening 7. This allows all the tongues adjacent to the opening 7 to remain in the same plane.
  • the orientation of the spring 48 relative to the tongues 27 is also important. Indeed, since the tongues 27 are arranged radially, there will be no attachment between them and the spring 48 if the latter is oriented parallel to the direction of introduction of the element 2 into the cartridge .
  • the cartridge 1 in which the element 2 is locked is inserted into the housing provided for this purpose in print wheel printers. Then, the drive hub 3 and the selection motor and the shaft which are connected to it are brought to the central hub 26. The shaft 37 enters the cup 32, the finger 40 in the hole 41 and the surface 45 comes into contact with the surface of the element in relief 29. The further movement of the hub 3 in the same direction will cause the vertical extension of the ends 57 and 58 of the spring 48 by the spherical end 50 of the stud 46 of the element 2. Finally, the element in relief 29 will be released from the opening 7 and the element 2 will thus be unlocked in order to be able to rotate in the cartridge 1. During the rotation of the element 2 for selection and printing operations, the arm 39 and the finger 40 are arranged in the cartridge 1 and the spring 48 acts of range for the spherical end 50 of the stud 46.
  • the cup-shaped structure of the central hub 26 has a number of advantages.
  • One of these advantages is due to the design of the arrangement presented here and consists in the fact that the printing element 2 taken as a whole can be relatively thin while resisting warping.
  • the thickness of the central hub 26, apart from the relief element 29 and the stud 46 can be essentially equal to the total thickness of the element 2.
  • Another advantage lies in the fact that the element relief 29 is brought closer to the positioning opening 7. This reduces the risk of interference between the rest of the printing element 2 and the cartridge 1.
  • the rest of the printing element 2 is separated from the spring 48 during the rotation of the element 2.
  • the relief element 29 is pressed with the thumb to cause the element 2 to be unlocked and a downward movement is exerted. If the lower part of the outer periphery of the element 2 is relatively close to the bottom 15 of the cartridge when the element 2 is locked in it, a very slight downward movement of the element is sufficient to provide a sufficient input area for the operator.

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  • Time Recorders, Dirve Recorders, Access Control (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Common Mechanisms (AREA)
EP79104880A 1978-12-11 1979-12-04 Typenscheibe mit Kassette Expired EP0013719B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US968322 1978-12-11
US05/968,322 US4245916A (en) 1978-12-11 1978-12-11 Daisy wheel print element structured for use in a cartridge

Publications (2)

Publication Number Publication Date
EP0013719A1 true EP0013719A1 (de) 1980-08-06
EP0013719B1 EP0013719B1 (de) 1981-11-25

Family

ID=25514072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104880A Expired EP0013719B1 (de) 1978-12-11 1979-12-04 Typenscheibe mit Kassette

Country Status (7)

Country Link
US (1) US4245916A (de)
EP (1) EP0013719B1 (de)
JP (1) JPS5579160A (de)
AU (1) AU523780B2 (de)
DE (1) DE2961473D1 (de)
ES (1) ES486228A1 (de)
IT (1) IT1172401B (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6054186B2 (ja) * 1978-09-18 1985-11-29 株式会社リコー 印字装置
US4389129A (en) * 1980-06-30 1983-06-21 Brother Kogyo Kabushiki Kaisha Type wheel printer
US4410288A (en) * 1981-12-14 1983-10-18 Holmes Lawrence Jr Vertical replacement daisy wheel element
NL8105753A (nl) * 1981-12-21 1983-07-18 Business Systems Inc Bv Tekstverwerkende inrichting voorzien van een verwisselbare schijf met flexibele symboolarmen.
GB2135246B (en) * 1983-02-23 1987-05-13 Ricoh Kk Daisy wheel supporting structure
JPH01137231U (de) * 1988-03-05 1989-09-20
US5074689A (en) * 1990-01-12 1991-12-24 Smith Corona Corporation Ribbon cassette with integral paper guide
US5098208A (en) * 1990-01-12 1992-03-24 Smith Corona Corporation Ribbon cassette with integral paper guide
US20060204153A1 (en) * 2005-03-10 2006-09-14 Honeywell International Inc. Compact resilient anisotropic support for bearing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986593A (en) * 1975-05-14 1976-10-19 Pitney-Bowes, Inc. Snap-action fastener assembly
FR2380139A1 (fr) * 1977-02-10 1978-09-08 Xerox Corp Imprimante a impact avec roue d'impression en cartouche
US4124312A (en) * 1977-02-10 1978-11-07 Xerox Corporation Impact printer with print wheel cartridge

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4209262A (en) * 1978-11-15 1980-06-24 Xerox Corporation Print wheel loading apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986593A (en) * 1975-05-14 1976-10-19 Pitney-Bowes, Inc. Snap-action fastener assembly
FR2380139A1 (fr) * 1977-02-10 1978-09-08 Xerox Corp Imprimante a impact avec roue d'impression en cartouche
US4124312A (en) * 1977-02-10 1978-11-07 Xerox Corporation Impact printer with print wheel cartridge

Also Published As

Publication number Publication date
JPS647870B2 (de) 1989-02-10
AU523780B2 (en) 1982-08-12
IT7927736A0 (it) 1979-11-30
ES486228A1 (es) 1980-05-16
AU5254879A (en) 1980-06-19
IT1172401B (it) 1987-06-18
DE2961473D1 (en) 1982-01-28
EP0013719B1 (de) 1981-11-25
US4245916A (en) 1981-01-20
JPS5579160A (en) 1980-06-14

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