EP0181876A1 - Drive system for different functions in typewriters or printing machines of similar design, based on the use of an electric motor. - Google Patents
Drive system for different functions in typewriters or printing machines of similar design, based on the use of an electric motor.Info
- Publication number
- EP0181876A1 EP0181876A1 EP85901975A EP85901975A EP0181876A1 EP 0181876 A1 EP0181876 A1 EP 0181876A1 EP 85901975 A EP85901975 A EP 85901975A EP 85901975 A EP85901975 A EP 85901975A EP 0181876 A1 EP0181876 A1 EP 0181876A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- rotor
- drive device
- motor
- print head
- 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
- 238000007639 printing Methods 0.000 title claims description 7
- 101100240595 Mus musculus Nipal4 gene Proteins 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007651 thermal printing Methods 0.000 description 1
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
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
- B41J25/316—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with tilting motion mechanisms relative to paper surface
-
- 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
- B41J23/00—Power drives for actions or mechanisms
- B41J23/32—Electromagnetic power drives, e.g. applied to key levers
- B41J23/34—Electromagnetic power drives, e.g. applied to key levers applied to elements other than key levers
Definitions
- the invention relates to a drive device for different functions in typewriters or printing devices of a similar design using an electric motor of the type specified in the preamble of claim 1.
- a drive device is known from EP-OS 0 038 215, in which a reversibly drivable stepper motor can perform two different functions in an office machine, depending on its direction of rotation. After the first function has expired, the second function can only take place after the direction of rotation of the stepping motor has been reversed. Time losses occur for two functions to be performed immediately one after the other, such as thermal printhead lifting from the recording medium and its transport in the line direction. In addition, a complex circuit arrangement is required for this.
- a thermal writing mechanism is known from DE-PS 24 06 613, in which a stepping motor is provided for the transport of the recording medium and an electromagnet is provided for pressing and lifting the thermal print head from the recording medium.
- the invention has for its object to provide a common drive device for different functions in power-driven machines, in writing or printing devices of a similar design using an electric motor, which is inexpensive and enables a simple and space-saving design. This object is achieved by the invention specified in the characterizing part of patent claim 1.
- a first or a second drive device can either run either at the beginning of the flow of the stepping motor or immediately one after the other.
- a third and a fourth function can be driven further.
- the stator and the rotor can be locked by one locking device each.
- the stator can be pivoted from a starting position into a latchable end position for driving a first drive device, after which, after being blocked in the end position, the drive movement of the rotor starts to drive a second drive device. It is also possible that first the rotor and then the stator are set in rotation.
- a separate locking device z. B. omitted for the rotor In this case it is necessary that the moments of inertia of the drive devices to be driven in one direction of rotation of the stepper motor are different, such that the rotary movement of the rotor starts automatically after the stator is locked. This further simplifies the drive device. Further advantageous features of the invention are characterized in the subclaims. The invention is illustrated in the drawings using exemplary embodiments and is explained in more detail below. It shows
- FIG. 1 shows a schematic illustration of the thermal printer in a side view
- FIG. 2 shows a plan view of some parts essential to the invention according to FIG. 1,
- FIG. 3 shows a side view of a second embodiment
- Figure 4 is a side view of an advantageous embodiment of the subject matter of the invention.
- a drive device for a thermal printer with a transport roller 1 for a heat-sensitive recording medium 2, which can be brought into contact with pressure in a known manner for generating records with a thermal print head 3.
- This thermal print head 3 has thermally insulated areas or dots which are arranged in the form of a matrix, so that an electrical signal for driving one of these matrix dots can be applied, as a result of which the driven matrix dot is heated.
- the thermal print head 3 is fastened on a carrier 4, on which a cable 5 for supplying a signal for driving the matrix points of the thermal print head 3 is fixedly arranged.
- a gear 6 is fastened on one side, which meshes with an intermediate gear 8.
- This intermediate gear 8 is with a drive wheel 9 firmly connected, which can be driven by a pinion 10.
- This pinion 10 is fastened to the rotor 11 of a stepping motor 12, the rotor 11 being rotatably mounted in bearings 15, 16 arranged on both sides of the motor 12 in side walls 13, 14.
- a control element 18 is fixedly connected to the stator 17 of the stepping motor 12 and has a latching recess 19 and control cams 21, 22 symmetrical to this (19), see FIG. 1.
- control element 18 has stop edges 23, 24 Provided, which are limitable to limit the pivoting movement of the stator 17 on the rotor 11 with frame-fixed stops 25, 26 for contact.
- the stop edges 23, 24 consist of flexible webs 27, 28 for the purpose of adjustment, which recesses 29, 30 for engagement of an adjusting tool, for. B. a commercially available screwdriver.
- the spring 32 is articulated on the one hand with the guide pin 34 and on the other hand on a pressure rocker arm 36 such that a stop edge 37 on the print head release arm 36 always rests non-positively on a stop lug 38 of the slide 20 and the slide 20 in the direction of arrow 39 acted upon.
- the printhead release rocker 36 is pivotally mounted about an axis 40 fixed to the frame and has a rail 41 arranged in the row direction. This slide 41 can be brought into contact with a stop arm 42 of the carrier 4 with the thermal print head 3 for releasing this thermal print head 3.
- the carrier 4 is displaceable in the line direction on a guide axis 43 arranged parallel to the transport roller and is pivotably mounted about this (43) against the force of a spring 44.
- the stepping motor 12 is actuated by a control element, not shown, e.g. B. controlled and energized by a microprocessor in the desired direction of rotation. Due to the inertia of the transmission members 9, 8, 6, which are operatively connected to the pinion 10 of the stepping motor 12, and the transport roller 1, the stator 17 is first pivoted about the rotor 11. As a result of the now rotating movement of the stator 17, the slide 20 is displaced via one of the control cams 21, 22 in the opposite direction of the arrow 39, the print head release rocker 36 being pivoted about the axis 40 in the counterclockwise direction.
- a control element not shown, e.g. B. controlled and energized by a microprocessor in the desired direction of rotation. Due to the inertia of the transmission members 9, 8, 6, which are operatively connected to the pinion 10 of the stepping motor 12, and the transport roller 1, the stator 17 is first pivoted about the rotor 11. As a result of the now rotating movement of the stator
- the stop arm 42 of the carrier 4 is pivoted clockwise about the axis 43 via the rail 41.
- the thermal print head 3 detaches from the recording medium 2 so that no wear of the thermal print head 3 can occur during the above-mentioned non-printing relative movements.
- the pivotal movement of the stator 17 is limited clockwise by hitting the stop edge 24 against the stop 26 and counterclockwise by hitting the stop edge 23 against the stop 25.
- the rotor 11 After blocking the pivoting movement of the stator 17, the rotor 11 begins to rotate, whereby the transport roller 1 for transporting the recording medium 2 is rotated in the line feed or line return direction via the gear pairs 10/9 and 8/6.
- the slide 20 is locked via the cam sections 45 and 46, respectively, and thus the print head release rocker 36 and the carrier 24 are held in the pivoted position.
- the direction of rotation of the stepper motor 12 is reversed, this stepper motor 12 receiving so many drive impulses that the slider 20 can snap resiliently into the catch recess 19 of the control element 18 with its catch 31.
- the printhead release speeds are ge 36 and the carrier 24 returned to their working positions.
- the thermal print head 3 is now again in pressure contact with the recording medium 2.
- the rotor 11 stops again, the stator 17 being pivoted back into the central position alone.
- control element 18 it is also possible for the control element 18 to be automatically returned to the latchable central position after the stepper motor 12 has been de-energized by the sprung (22) slide 20.
- the control cams 50, 51 must have a shape according to FIG. 3 such that the slide 20 cannot be locked in the end positions of the stator 17 via the control cams 50, 51.
- the microprocessor after the transport of the recording medium, there is no need to actuate the stepping motor 12 again. B. by the microprocessor.
- two oppositely toothed gear wheels 52, 53 can also be firmly connected to the rotor 11, with the toothings 54, 55 of which pawls 56, 57 engage.
- the pawls 56, 57 are pivotable on both sides of the rotor 11 about fixed axes 58, 59, by a common spring 60 with their locking teeth 61, 62 in engagement with the teeth 54, 55 of the locking gears 52, 53 - And by a pivotable with the stator 12 stop 63 out of engagement with the ratchet gears 52, 53.
- This reliably prevents the rotor from transmitting a rotary movement to the transport roller 1 via the intermediate gearwheels only when the stator 17 has reached one of the end positions.
- a rotary movement of the rotor 11 is only possible when one of the pawls 56, 57 has been disengaged from the teeth 54, 55 of the ratchet gears 52, 53.
- the thermal printer according to the invention is characterized by a simple and inexpensive construction, with a long service life the thermal print head is guaranteed. It can also be used advantageously if characters are generated on plain paper with the interposition of a heat-sensitive ink ribbon.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Common Mechanisms (AREA)
- Character Spaces And Line Spaces In Printers (AREA)
Abstract
Dans les machines à écrire ou les machines de bureau semblables il est connu d'utiliser par exemple pour plusieurs fonctions soit un élément d'entraînement particulier pour chaque fonction, soit un moteur commun. Un changement de fonction dans le cas d'un moteur commun dans l'art antérieur est possible en inversant le sens de rotation du moteur ou en actionnant un embrayage intermédiaire. L'invention a pour but de créer un dispositif d'entraînement commun pour différentes fonctions dans des machines à écrire ou machines de bureau semblables, qui soit moins coûteux et qui permette une construction simple et compacte. Ce problème est résolu par le fait que le stator (17) et le rotor (11) d'un moteur pas à pas (12) peuvent être alternativement actionnés et bloqués pour la transmission de l'énergie fournie par le moteur (12) à un premier ou à un deuxième mécanisme d'entraînement. Le fait que le stator et le rotor (11) du moteur pas à pas (12) peuvent entraîner différentes fonctions permet de réaliser un dispositif d'entraînement à bon marché.In typewriters or similar office machines it is known to use, for example, for several functions either a particular drive element for each function, or a common motor. A change of function in the case of a common motor in the prior art is possible by reversing the direction of rotation of the motor or by actuating an intermediate clutch. The object of the invention is to provide a common drive device for different functions in typewriters or similar office machines, which is less expensive and which allows a simple and compact construction. This problem is solved by the fact that the stator (17) and the rotor (11) of a stepping motor (12) can be alternately actuated and blocked for the transmission of the energy supplied by the motor (12) to a first or a second drive mechanism. The fact that the stator and the rotor (11) of the stepping motor (12) can drive different functions, makes it possible to realize a drive device inexpensively.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3416168 | 1984-05-02 | ||
DE3416168 | 1984-05-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0181876A1 true EP0181876A1 (en) | 1986-05-28 |
EP0181876B1 EP0181876B1 (en) | 1988-07-27 |
Family
ID=6234769
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85901975A Expired EP0181876B1 (en) | 1984-05-02 | 1985-04-19 | Drive system for different functions in typewriters or printing machines of similar design, based on the use of an electric motor |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0181876B1 (en) |
JP (1) | JPS61502047A (en) |
DE (1) | DE3563931D1 (en) |
WO (1) | WO1985005076A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR937012A (en) * | 1941-08-12 | 1948-08-05 | King Ltd Geo W | Braking device for electric motors |
GB1206220A (en) * | 1968-05-31 | 1970-09-23 | Colchester Woods | Improvements in or relating to actuating arrangements for operating shutters associated with electric-motor-driven fans |
JPS49106731A (en) * | 1973-02-12 | 1974-10-09 | ||
US3853024A (en) * | 1973-10-29 | 1974-12-10 | Ibm | Two speed drive system for print mechanism or the like |
IT1130115B (en) * | 1980-04-15 | 1986-06-11 | Olivetti & Co Spa | ACTUATION DEVICE FOR TWO FUNCTIONS OF WRITING MACHINES |
CH663601A5 (en) * | 1982-10-06 | 1987-12-31 | Kurt Ruenzi | METHOD AND TRANSPORT DEVICE FOR SUPPLYING SHEET-SHAPED IMPRESSION MATERIAL TO AN OFFICE MACHINE. |
-
1985
- 1985-04-19 WO PCT/DE1985/000126 patent/WO1985005076A1/en active IP Right Grant
- 1985-04-19 EP EP85901975A patent/EP0181876B1/en not_active Expired
- 1985-04-19 DE DE8585901975T patent/DE3563931D1/en not_active Expired
- 1985-04-19 JP JP60501943A patent/JPS61502047A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO8505076A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3563931D1 (en) | 1988-09-01 |
WO1985005076A1 (en) | 1985-11-21 |
JPS61502047A (en) | 1986-09-18 |
EP0181876B1 (en) | 1988-07-27 |
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