WO1991006429A1 - Wire driving mechanism - Google Patents
Wire driving mechanism Download PDFInfo
- Publication number
- WO1991006429A1 WO1991006429A1 PCT/JP1990/001382 JP9001382W WO9106429A1 WO 1991006429 A1 WO1991006429 A1 WO 1991006429A1 JP 9001382 W JP9001382 W JP 9001382W WO 9106429 A1 WO9106429 A1 WO 9106429A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- arms
- wire
- arm
- drive source
- expansion
- Prior art date
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 46
- 238000006073 displacement reaction Methods 0.000 claims abstract description 40
- 238000007639 printing Methods 0.000 claims abstract description 30
- 230000008602 contraction Effects 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 230000009466 transformation Effects 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
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
- B41J2/27—Actuators for print wires
- B41J2/295—Actuators for print wires using piezoelectric elements
Definitions
- the present invention relates to a wire driving mechanism used for wire-dot printing head, and more particularly to a wire driving mechanism suitable for using a piezoelectric element or a magnetostrictive element as a driving source. (Background technology)
- a wire dot printing head in which a piezoelectric element having a property of converting electric vibration into mechanical vibration or a magnetostrictive element having a property of being distorted by a magnetic field is used as a driving source. Since the piezoelectric element and the magnetostrictive element can follow a high-frequency drive pulse, high-speed printing can be performed by using these elements as a drive source.
- the piezoelectric element and the magnetostrictive element have such advantages, but on the other hand, the extension amount of these elements is generally 5 m to 15 m.
- the stroke of the print wire in the print head needs to be at least about 0.3 mm, and the stroke of about 0.5 mm is required to print on various print media with sufficient quality. is necessary.
- the method disclosed in Japanese Patent Publication No. 60-54191 uses a plurality of magnetostrictive elements and adds the displacement of each element.
- the method described in Japanese Patent Application Laid-Open No. 63-144055 The horn increases the vibration displacement of the element.
- An object of the present invention is to provide a wire drive mechanism for a head.
- a further object of the present invention is to provide a highly reliable print head having a long life of a wire drive mechanism.
- two arms each having one end fixed are provided in parallel, and these arms are rotated by the expansion and contraction force of a telescopic drive source. Due to this surface movement, a displacement amount in which the amount of deformation of the drive source is increased is obtained at the free end of each arm, and this displacement amount is applied stepwise to both sides of the drive body via a pair of support pieces, and Is rotated.
- the printing wire advances in the printing direction by this rotating power, and a required printing stroke is obtained.
- the amount of deformation of the drive source can be sufficiently increased despite a simple configuration, and a sufficient printing stroke for performing impact printing can be obtained and good printing can be performed. . Therefore, printing heads with high speed and low power consumption can be provided at low cost.
- FIG. 1 is a perspective view of a main part of a piezoelectric element driving type wire driving mechanism according to the present invention
- FIG. 2 is a front view of a magnetostrictive element driving type wire driving mechanism
- FIG. FIG. 4 is a plan view of the piezoelectric element assembly
- FIG. 5 is an explanatory diagram of an operation at the time of driving
- FIG. 6 is a wire driving mechanism shown in FIG.
- FIG. 7 is a perspective view of a wire drive mechanism as a first improvement example of FIG. 7
- FIG. 7 is a displacement characteristic diagram of a printing wire
- FIG. 8 is a second improvement of the wire drive mechanism shown in FIG.
- FIG. 9 is a perspective view of an example wire drive mechanism
- FIG. 9 is a sectional view taken along the line HH of FIG. 8, and FIG. 10 is a perspective view of the piezoelectric element assembly shown in FIG. Yes, FIG. 11 is a front view of a wire driving mechanism as a modification of FIG. 1, and FIG. 12 is a modification of FIG. 2 of a wire driving mechanism. It is a surface view.
- FIGS. 1 and 2 show an embodiment of a wire drive mechanism of the present invention. Show.
- FIG. 1 is a perspective view of an essential part of a piezoelectric element driving type wire driving mechanism
- FIG. 2 is a front view of a magnetostrictive element driving type wire driving mechanism.
- a frame 1 of the apparatus is configured by first and second arms 3a and 3b standing from both ends of a base 2, respectively.
- This frame 1 is integrally formed of, for example, metal, and as shown in the dimensional explanatory view of each part in FIG. 3, the length £ 3 of the second arm 3b is equal to the length of the first arm 3a. It is longer than £ 2 .
- the lower ends of the first and second arms 3a, 3b are formed thinner than the other portions, and the joint between the arms 3a, 3b and the base 2 is an elastic bent portion 4a. , 4b.
- the first leaf spring 6a is fixed to the upper end of the first arm 3a
- the second leaf spring 6b is fixed to the upper end of the second arm 3b.
- These leaf springs 6a, 6b are arranged in parallel with the base 2, that is, in a direction perpendicular to the longitudinal direction of the first and second arms 3a, 3b.
- the free ends of b face each other at the approximate center of frame 1.
- the second leaf spring 6b is greater than the first leaf spring 6a.
- the leaf springs 6a and 6b are arranged at an upper position, and are stepped. ;
- the printing wire 7 is advanced in the printing direction.
- a driving body 8 is supported by these leaf springs 6a and 6b and attached to the frame 1 substantially at the center. That is, engaging grooves 8a and 8b are formed on the side wall of the driving body 8, and the tips of the leaf springs 6a and 6b are engaged with these engaging grooves 8a and 8b, respectively.
- the driving body 8 is attached to the center of the frame 1 as shown in FIG. In FIG. 3, the center lines of the driving body 8 and the frame 1 are shown as vertical lines 20.
- the piezoelectric element 5a is used as a driving source for driving the wire driving mechanism configured as described above.
- the piezoelectric element 5a is disposed between the first arm 3a and the second arm 3b so that its extension direction is parallel to the base 2, and is applied via the lead wire 9.
- the printing operation is performed by the expansion and contraction of the piezoelectric element 5a according to the voltage.
- a plurality of piezoelectric elements 5a are bonded with an adhesive 30, and the respective bonding surfaces are connected in parallel with lead wires 31a and 31b to form a piezoelectric element assembly 5. Is also good.
- the magnetostrictive element driving type wire driving mechanism shown in FIG. 2 uses a magnetostrictive element 32 as a drive source, and a coil 33 for generating a magnetic field is wound around the magnetostrictive element 32.
- a magnetostrictive element 32 as a drive source
- a coil 33 for generating a magnetic field is wound around the magnetostrictive element 32.
- the displacement and movement in the following description cause movement on a circular arc, but since the angle of rotation is small, the displacement approximates a straight line. Therefore, for ease of explanation, the movement on the arc is also a linear movement;
- the directions on the drawing are expressed as -X, + X, + y, -y, corresponding to the left, right, top, and bottom, respectively. If only the direction is referred to, the bent parts 4a, 4b X along the left-right direction line 2 1 passing through Direction, the direction along the vertical line 20 is described as the y direction.
- the first arm 3a is pressed in the X direction
- the second arm 3b is pressed in the X direction.
- the first arm 3a and the second arm 3b are slightly separated in the directions away from each other with the bent portions 4a and 4b as their respective plane fulcrums, that is, in the X direction and the + X direction. Rotates by an angle, where the extension of the piezoelectric element 5a is ⁇ .
- each of the arms 3a, 3b The displacement at the tip of each of the arms 3a, 3b is transmitted to the driver 8 via the leaf springs 6a, 6b.
- these leaf springs 6 a and 6 b have a length from the fulcrum of £ z, respectively.
- i 3 is attached to the free end of each arm and attached parallel to the X axis. Therefore, the engagement grooves 8 a and 8 b on the driving body 8 engaged with the distal ends of these leaf springs 6 a and 6 b are spaced from the left-right direction line 21 by a distance of £ 2 , S> 3, respectively. It is in.
- the displacement amount and the force based on the (J 3 is applied to the engaging grooves 8 a, 8 b,
- the frame 8 is turned clockwise around the virtual center point 10 on the y-axis as shown in Fig. 5 (B).
- the plane rotation angle ⁇ of the driving body 8 is approximately
- the printing wire 7 is displaced in the X direction due to the image transformation of the moving body 8.
- the distance from the connecting point between the driving body 8 and the printing wire 7 to the virtual moving image center point 10 is £ 7
- the displacement amount of the printing wire 7 5 4 (the amount of movement to the position indicated by the dotted line in FIG. 3)
- the deformation amount of the piezoelectric element 5a is 5.
- the arms of the U-shaped frame are changed in length to support the movable members alternately with flat plate panels.
- the arm length is the same, and the plate panels are bent stepwise.
- the movable members may be supported alternately.
- FIG. 6 is a first modification of the wire drive mechanism of FIG.
- FIG. 9 is a perspective view of a main part of a wire drive mechanism improved so as to obtain a larger vibration displacement amount than the print head described above.
- a horn 11 is provided between the piezoelectric element assembly 5 and the second arm 3b.
- the horn 11 is made of, for example, a solid material such as a metal, and has one end face formed into a large circular shape and the other end face formed into a small circular shape.
- the horn 11 configured in this way has one end face 11 a formed with a large area facing the piezoelectric element assembly 5 and the other end face 11 b formed with a small area with the other.
- the piezoelectric element assembly 5 is provided between the second arm 3b and the piezoelectric element assembly 5 in the direction of the second arm 3b. Then, the horn 11 is fixed to the piezoelectric element assembly 5 by bonding or the like, so that slack or the like due to vibration does not occur.
- FIG. 7 is a diagram showing the relationship between the voltage applied to the piezoelectric element assembly 5 and the displacement of the wire, wherein the characteristic A is the characteristic of the print head having the wire moving mechanism provided with the horn 11; The characteristic B shows the characteristic of the print head of FIG. 1 in which the horn 11 is not provided. As is clear from FIG. 7, the print head having the horn 11 can obtain a large wire displacement if the applied voltage is the same. Conversely, the applied voltage for obtaining a predetermined wire displacement can be reduced. 06429
- the shape and size of the horn 11 can be variously formed according to the use condition.
- the horn 11 is fixed only to one end of the piezoelectric element assembly 5.
- the shape of the horn 11 is modified to be attached to both ends of the piezoelectric element assembly 5 to further increase the displacement. It is also possible.
- FIG. 8 is a perspective view of a main part of a wire drive mechanism as a second improved example
- FIG. 9 is a sectional view taken along the line HH of FIG.
- FIG. 10 is a perspective view of the piezoelectric element assembly of FIG.
- the difference from Fig. 1 is that the piezoelectric element assembly 5 is fixed between the first and second arms 3a and 3b with screws 24 as shown in Figs. Upon fixing, the piezoelectric element assembly 5 is compressed with a predetermined screw tightening force.
- the piezoelectric element assembly 5 has metal pieces (for example, iron plates) 26 and 27 adhered to both end faces.
- the piezoelectric element assembly 5 changes from a compressed state to a state without distortion.
- the first and second arms 3a and 3b of the frame 1 bend at the bending portions 4a and 4b, respectively, and perform the printing operation.
- the ⁇ of the compressed state and the undistorted state of the piezoelectric element can be used.
- the life of the piezoelectric element is extended, As a result, the life of the wire drive mechanism is extended and a highly reliable head print head can be provided.
- adjusting means such as screws are used, so that a plurality of piezoelectric elements are fixed with an adhesive or the like and assembled. In this case, it is not necessary to control the length of the wire, and it is possible to provide an inexpensive wire dot printing head with a high production yield.
- FIGS. 11 and 12 are modifications of the wire drive mechanism shown in FIGS. 1 and 2, in which one arm is provided rotatably and the other arm is fixed. is there.
- the frame 41 includes an L-shaped base 42 that holds a fixed arm, a rotatable arm 43, and an elastic bending portion 44 that connects the base 42 and the arm 43. Is done.
- a piezoelectric element assembly 5 is fixed between the base 42 and the arm 43.
- the magnetostrictive element 32 is fixed between the base 42 and the arm 43, and the coil 33 is wound around the magnetostrictive element 32. I have.
- a first leaf spring 46 a is fixed to the end 42 a of the base 42, and a second leaf spring 46 b is fixed to the end 43 a of the arm 43.
- the horizontal positions of the ends 4 2a and 4 3a are shifted, so that the first leaf spring 46a and the second leaf spring 46b do not lie on a straight line. It has become.
- the tip of the first leaf spring 46 a and the tip of the second leaf panel 46 b are engaged with the driving body 48 to which the printing wire 47 is fixed at one end.
- the grooves 48a and 48b are engaged.
- This displacement X 2 is transmitted to the driving body 48 by the second leaf spring 46 b.
- the first leaf spring 46a and the second leaf spring 46b do not ride on a straight line, and one of the engagement grooves 48a of the driving body 48 is Since the driving member 48 is not displaced by being connected to the driving member 48, the driving body 48 performs a minute angle shift by ⁇ X 2 in the other engaging groove 48 b with the engaging groove 48 a as a fulcrum.
- the key driving mechanism according to the present invention is used for a dot matrix type printer, a key printer head of a serial printer, particularly a key printer head capable of high-speed printing. Are suitable.
Landscapes
- Impact Printers (AREA)
Description
Claims
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12717989 | 1989-11-01 | ||
JP1/127179U | 1989-11-01 | ||
JP32657989 | 1989-12-15 | ||
JP1/326579 | 1989-12-15 | ||
JP2/2639U | 1990-01-16 | ||
JP263990 | 1990-01-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991006429A1 true WO1991006429A1 (en) | 1991-05-16 |
Family
ID=27275453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1990/001382 WO1991006429A1 (en) | 1989-11-01 | 1990-10-26 | Wire driving mechanism |
Country Status (3)
Country | Link |
---|---|
US (1) | US5167458A (ja) |
EP (1) | EP0452502A4 (ja) |
WO (1) | WO1991006429A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19710601C2 (de) * | 1997-03-14 | 1999-05-20 | Univ Magdeburg Tech | Bewegungsgenerator |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04109147U (ja) * | 1991-03-04 | 1992-09-21 | ブラザー工業株式会社 | ドツトインパクト印字ヘツド装置 |
EP0756938A3 (en) * | 1992-05-08 | 1998-01-14 | Fujitsu Limited | Printing head |
DE19833782A1 (de) | 1998-07-27 | 2000-02-03 | Abb Instrumentation Ltd | Antriebsanordnung für einen Schreibkopf |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5614040U (ja) * | 1979-07-13 | 1981-02-06 | ||
JPS62209877A (ja) * | 1986-03-10 | 1987-09-16 | Ngk Spark Plug Co Ltd | 圧電変位素子 |
JPS6475256A (en) * | 1987-09-17 | 1989-03-20 | Nec Corp | Printing element |
JPH01275150A (ja) * | 1988-04-28 | 1989-11-02 | Fujitsu Ltd | 印字ヘッド |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5614040A (en) * | 1979-07-17 | 1981-02-10 | Japan Crown Cork Co Ltd | Production of vessel cover and device used for this |
JPS5814765A (ja) * | 1981-07-17 | 1983-01-27 | Nec Corp | インパクトプリンタヘツド |
US4435666A (en) * | 1981-05-26 | 1984-03-06 | Nippon Electric Co., Ltd. | Lever actuator comprising a longitudinal-effect electroexpansive transducer and designed to prevent actuation from degrading the actuator |
JPS5916767A (ja) * | 1982-07-20 | 1984-01-27 | Nec Corp | 印字ユニツト |
US4547086A (en) * | 1982-12-06 | 1985-10-15 | Nec Corporation | Piezoelectrically driven printing mechanism for dot matrix printers |
JPS6256155A (ja) * | 1985-09-05 | 1987-03-11 | Nec Corp | 印字ヘツド |
JPH043809Y2 (ja) * | 1985-12-25 | 1992-02-05 | ||
JPS63144054A (ja) * | 1986-12-05 | 1988-06-16 | Nec Corp | 印字ヘツド |
-
1990
- 1990-10-26 EP EP19900915831 patent/EP0452502A4/en not_active Ceased
- 1990-10-26 WO PCT/JP1990/001382 patent/WO1991006429A1/ja not_active Application Discontinuation
- 1990-10-26 US US07/720,435 patent/US5167458A/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5614040U (ja) * | 1979-07-13 | 1981-02-06 | ||
JPS62209877A (ja) * | 1986-03-10 | 1987-09-16 | Ngk Spark Plug Co Ltd | 圧電変位素子 |
JPS6475256A (en) * | 1987-09-17 | 1989-03-20 | Nec Corp | Printing element |
JPH01275150A (ja) * | 1988-04-28 | 1989-11-02 | Fujitsu Ltd | 印字ヘッド |
Non-Patent Citations (1)
Title |
---|
See also references of EP0452502A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19710601C2 (de) * | 1997-03-14 | 1999-05-20 | Univ Magdeburg Tech | Bewegungsgenerator |
Also Published As
Publication number | Publication date |
---|---|
US5167458A (en) | 1992-12-01 |
EP0452502A1 (en) | 1991-10-23 |
EP0452502A4 (en) | 1992-03-25 |
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