JP2006312279A - Inkjet printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet printer in which motor terminals are prevented from getting short-circuited. <P>SOLUTION: The inkjet printer has a sheet pressing member 1 arranged downstream from an inkjet head in a printed matter transfer route where an ink is discharged and a motor 2 arranged upstream from the sheet pressing member 1 in the transfer route when seen in a plane view. The sheet pressing member 1 includes a supporting substrate 11 formed in a state of being extended in the width direction. The supporting substrate 11 has a covering portion 14 to cover the upper sides of the terminals 22a and 22b of the motor 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an inkjet printer.

  An ink jet printer performs printing by ejecting ink of each color onto a printing material such as paper in the form of droplets. The substrate is transported by being sandwiched between cylindrical transport rollers and the like.

  The ink jet head is formed so as to hold ink tanks of respective colors. The ink jet head is formed so that ink can be appropriately extracted from the ink tanks of the respective colors and ejected onto the printing material.

  The ink jet printer includes a motor for driving a transport roller for transporting a substrate. The inkjet printer also includes a motor for moving the inkjet head in the paper width direction.

  These motors are fixed to an inner frame or an outer casing. Each motor is disposed at a position that does not hinder the movement of the inkjet head (see, for example, Japanese Patent Application Laid-Open No. 11-138783 or Japanese Patent Application Laid-Open No. 2004-345126).

  Some ink jet printers include a sheet pressing member arranged on the downstream side of the position where the ink jet head ejects ink in the transport path of the substrate.

  Ink or the like discharged on the printing material is not dried instantly but is moist for a while. In this state, when the conveyance roller makes a line contact with the substrate, ink adheres to the conveyance roller and stains a printed image or the like.

  For this reason, the seal pressing member disposed on the downstream side of the position where the ink jet head ejects ink in the conveyance path of the printed material includes a star wheel formed so as to make point contact with the printed material. The star wheel includes a portion having a pointed tip along the circumferential direction, and the tip of the pointed portion contacts the substrate.

  FIG. 7 shows a schematic perspective view when the upper cover of the ink jet printer is removed. This ink jet printer includes a lower cover 52. The lower cover 52 includes a paper discharge tray 54 for temporarily placing a printed material to be printed. The paper discharge tray 54 is formed so that it can be taken in and out of the lower cover 52.

  The lower cover 52 includes support pillars 57 that are erected upward from the bottom surface. The sheet pressing member 9 is fixed to the support column 57 with screws 17. The sheet pressing member 9 includes a support substrate 91 and a star wheel 12. The star wheel 12 is disposed in an opening formed in the support substrate 91.

  The ink jet printer includes a frame 6 fixed to the lower cover 52. The frame 6 is formed in a plate shape. The inkjet head 4 is supported by the frame body 6. The inkjet head 4 is formed so as to be movable in the width direction indicated by the arrow 81.

  The ink jet printer includes a conveyance roller 7 and a counter roller 3. The conveyance roller 7 and the counter roller 3 are formed in a columnar shape. The conveyance roller 7 and the counter roller 3 are formed so as to be in line contact with each other. As the conveying roller 7 and the counter roller 3 rotate, the substrate is formed so as to be conveyed as indicated by arrows 82 and 83. The ink jet printer includes a motor 2 for driving the transport roller 7.

  FIG. 8 shows an enlarged schematic plan view of a portion where the motor is arranged. The motor base 27 is disposed on the bottom surface of the lower cover 52. The motor 2 is fixed to the motor base 27. A motor pin 24 is connected to the motor 2. When the motor 2 is driven, the gears 25 and 26 are formed to rotate via the motor pin 24. When the gears 25 and 26 are rotated, the transport roller 7 is rotated via the shaft 28.

Terminals 22 a and 22 b for applying a voltage are arranged on the side opposite to the side where the motor pins 24 are arranged in the motor 2. The terminal 22a is connected to the conducting wire 23a. The terminal 22b is connected to the conducting wire 23b. The motor 2 is driven by applying a voltage to the conducting wires 23a and 23b. Thus, the motor 2 is formed so as to be exposed when the upper cover is opened and viewed in plan.
JP 11-138783 A JP 2004-345126 A

  Referring to FIGS. 7 and 8, the inkjet printer includes a printer in which a motor for transporting a printed material or a motor for driving an inkjet head is exposed when seen in a plan view.

  When the ink of a predetermined color runs out during use of the ink jet printer, the ink tank of the corresponding color is replaced. When the ink tank is replaced or repaired, the upper cover of the printer may be removed or the open / close door formed on the upper cover of the printer may be opened.

  In such a case, there is a problem that the terminal of the motor may be short-circuited with another conductive member by accidentally dropping the conductive member into the lower cover. Or there existed a problem that the terminals arrange | positioned at a motor will short-circuit.

  An object of the present invention is to provide an ink jet printer that prevents a short circuit of a motor terminal.

  An ink jet printer according to an aspect of the present invention drives a sheet pressing member disposed on a downstream side of a position where ink is ejected by an ink jet head and a transport roller for transporting the print medium in a transport path of the print medium. And a motor. The motor is disposed on the upstream side of the conveyance path from the sheet pressing member when seen in a plan view. The sheet pressing member includes a support substrate formed to extend in the width direction. The sheet pressing member includes a star wheel supported by the support substrate. The support substrate has a cover portion formed so as to cover the upper side of the terminal of the motor. The cover portion is formed in a curved shape so as to follow the shape of the casing of the motor. When the conductive member is dropped from the upper side of the covering portion, the terminal is prevented from being short-circuited.

  An ink jet printer according to another aspect of the present invention includes a sheet pressing member disposed on a downstream side of a position where ink is ejected by an ink jet head in a conveyance path of a substrate, and the sheet pressing member when viewed in plan. And a motor disposed upstream of the transport path. The sheet pressing member includes a support substrate formed to extend in the width direction. The support substrate has a cover portion formed so as to cover the upper side of the terminal of the motor.

  In the above invention, preferably, the cover portion has a portion formed in a curved shape so as to follow the shape of the motor.

  Preferably, in the above invention, the covering portion is disposed at an end portion on the upstream side of the transport path, and has a recessed portion whose cross-sectional shape is formed in a V shape or a U shape.

  ADVANTAGE OF THE INVENTION According to this invention, the inkjet printer which prevented the short circuit of the terminal of a motor can be provided.

(Embodiment 1)
The ink jet printer according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3 and FIG. The ink jet printer in this embodiment is a composite ink jet printer having a scanner function.

  FIG. 6 is a schematic perspective view of the ink jet printer according to the present embodiment. The ink jet printer in the present embodiment includes a housing 5. The housing 5 includes an upper cover 51 and a lower cover 52. The housing 5 is formed in a box shape. An intermediate cover is disposed between the upper cover 51 and the lower cover 52 (not shown).

  Inside the housing 5, devices such as an inkjet head are arranged. An operation unit 56 having a plurality of buttons and the like is formed on the front surface of the upper cover 51. On the front surface of the lower cover 52, a paper discharge tray 54 that can be put in and out is arranged.

  An opening is formed on the upper surface of the housing 5, and a glass 55 is disposed in the opening. A scanner device is disposed below the glass 55. A document presser 53 that can be opened and closed is disposed on the upper side of the housing 5.

  When this ink jet printer is used as a scanner, a document is placed on the glass 55 and the document is pressed by the document presser 53. An image of a document is read by a scanner device arranged on the lower side of the glass 55. The printed material on which the read image or the like is printed is discharged from the paper discharge tray 54.

  FIG. 1 shows a schematic perspective view of the ink jet printer according to the present embodiment when the upper cover and the middle cover are removed.

  The lower cover 52 is formed in a box shape whose upper side is open. The frame body 6 is fixed to the bottom surface of the lower cover 52. The frame body 6 is formed of a metal plate. The frame body 6 supports the inkjet head 4.

  The inkjet head 4 has an ink tank that holds ink of each color. In the present embodiment, two ink tanks are arranged. The ink jet head 4 is formed to be movable in the width direction of the ink jet printer (width direction of paper or the like) indicated by an arrow 81.

  On the lower side of the inkjet head 4, ejection ports for ejecting the respective color inks are formed. The ink-jet head 4 is formed so that a controlled amount of each color of ink can be ejected onto a substrate such as paper while moving in the width direction indicated by the arrow 81.

  The ink jet printer includes a transport roller 7 for transporting the printing material. The ink jet printer also includes a counter roller 3 disposed so as to be in line contact with the transport roller 7. Each of the transport roller 7 and the counter roller 3 in the present embodiment is formed in a cylindrical shape. The transport roller 7 and the counter roller 3 are arranged on the upstream side of the position where the ink jet head ejects ink in the transport path of the printed material.

  A support column 57 is formed on the bottom surface of the lower cover 52 so as to stand from the bottom surface. In the present embodiment, two support columns 57 are arranged in the width direction. The sheet pressing member 1 is fixed to the support column 57. The sheet pressing member 1 is fixed by screws 17. The sheet pressing member 1 is formed so as to sandwich and convey the printed material and guide the printed material to the paper discharge tray 54. The sheet pressing member in the present embodiment is disposed on the downstream side of the position where ink is ejected onto the printing material.

  The sheet pressing member 1 includes a support substrate 11 formed so as to extend in the width direction of the ink jet printer. The support substrate 11 is formed in a plate shape. The sheet pressing member 1 includes a star wheel 12 supported by a support substrate 11. The star wheel 12 is disposed in an opening formed in the support substrate 11. The sheet pressing member 1 includes a pressing roller disposed so as to face the star wheel 12 (not shown). The presser roller is formed in a cylindrical shape. The presser roller is disposed so as to make point contact with the star wheel. The star wheel and the presser roller are formed so that they can come into contact with each other and can sandwich the substrate.

  A printed material such as paper is sandwiched between the transport roller 7 and the counter roller 3 and transported in the direction indicated by the arrow 82. The substrate is conveyed toward the sheet pressing member 1 as indicated by an arrow 82. Ink is ejected onto the surface of the printed material by the inkjet head 4 between the sheet pressing member 1 and the transport roller 7 in the transport path. The printed material is conveyed toward the paper discharge tray 54 by the sheet pressing member as indicated by an arrow 83.

  The ink jet printer in the present embodiment includes a motor 2 for driving the transport roller.

  FIG. 2 shows an enlarged schematic plan view of a portion where the motor is arranged. The motor 2 is arranged upstream of the sheet pressing member 1 in the conveyance path of the printed material when viewed in plan. The motor base 27 is disposed on the bottom surface of the lower cover 52. The motor 2 includes a motor housing 21. The motor housing 21 is fixed to the motor base 27. The motor 2 is disposed at the end of the frame 6 in the width direction.

  A motor pin 24 is connected to the motor 2. The motor 2 is disposed so that the motor pins 24 face outward. The motor pin 24 is engaged with the gears 25 and 26. When the motor pin 24 rotates, the gears 25 and 26 are formed to rotate. The gear 25 is connected to the shaft 28. The motor 2 is close to the sheet pressing member.

  The shaft 28 is connected to the transport roller 7. When the motor 2 is driven, the transport roller 7 is formed to rotate via the motor pin 24, the gear 25 and the shaft 28.

  The motor 2 includes terminals 22a and 22b for applying a voltage. The terminal 22a is connected to the conducting wire 23a. The terminal 22b is connected to the conducting wire 23b. The terminals 22a and 22b face the inside of the ink jet printer. The motor 2 is formed such that a voltage is applied to the terminals 22a and 22b via the conductors 23a and 23b under the control of a control unit (not shown). That is, the motor 2 is driven by the control of the control unit.

  The support substrate 11 in the present embodiment has a cover portion 14 formed so as to cover the terminals 22 a and 22 b of the motor 2. The cover part 14 in this Embodiment is formed so that a planar shape may become a substantially rectangular shape. The cover 14 is formed by extending the end of the support substrate 11. The cover portion 14 is formed so as to cover almost the entire motor 2.

  FIG. 3 shows a cross-sectional view taken along the line III-III in FIG. FIG. 3 is a schematic cross-sectional view of the cover portion in the present embodiment. As described above, the support substrate 11 is fixed to the support column 57 with the screws 17. The motor 2 is disposed on the upper surface of the motor base 27 fixed to the lower cover 52.

  The cover portion 14 of the support substrate 11 has a portion formed in a curved shape so as to follow the shape of the housing of the motor 2. In the present embodiment, the tip end portion of the cover portion 14 is formed in a curved surface shape. The distal end portion of the cover portion 14 is formed so that the cross-sectional shape is an arc shape. The cover 14 is formed to extend toward the rear side of the ink jet printer.

  As described above, the support substrate is provided with a cover portion formed so as to cover the upper side of the motor terminal, so that even when a conductive member is dropped in the vicinity of the motor, the motor terminal has another conductivity. It is possible to prevent a short circuit due to contact with the member. Or it can prevent that the terminals of a motor short-circuit.

  Moreover, the cover part for covering a motor can be formed only by changing the shape of the support substrate contained in the sheet pressing member. That is, a portion covering the motor terminal can be formed without forming another member.

  Moreover, the cover part 14 in this Embodiment is formed so that the shape of the motor 2 may be followed. By adopting this configuration, it is possible to reduce the space in which the cover portion is to be arranged. For example, as shown in FIG. 1, the inkjet head 4 moves above the sheet pressing member 1. Even in such an ink jet printer, it is possible to avoid the cover 14 from hindering the movement of the ink jet head.

  Although the cover part in this Embodiment is formed so that a planar shape may become a substantially square shape, it is not restricted to this form, Arbitrary shapes can be employ | adopted. Moreover, although the cover part in this Embodiment contains the part formed in the curved surface shape, it is not restricted to this form, Arbitrary shapes can be employ | adopted.

  Further, the cover portion in the present embodiment is formed so as to cover almost the entire motor terminal and motor housing, but is not limited to this form, and is formed so as to cover at least the motor terminal portion. It doesn't matter if it is done. Furthermore, in the present embodiment, a motor for driving the conveyance roller is disposed as the motor. However, the present invention is not limited to this, and for example, a motor for moving the inkjet head may be used.

  In the present embodiment, an inkjet printer having a scanner function has been described. However, the present invention is not limited to this embodiment, and the present invention can be applied to any inkjet printer.

(Embodiment 2)
With reference to FIG. 4 and FIG. 5, the ink jet printer in Embodiment 2 of this invention is demonstrated. In the ink jet printer according to the present embodiment, the configuration of the cover formed on the sheet pressing member is different from that of the first embodiment.

  FIG. 4 shows an enlarged schematic plan view of a portion where a motor for driving the conveyance roller in the present embodiment is arranged. FIG. 5 is a cross-sectional view taken along the line VV in FIG. The sheet pressing member 8 in the present embodiment includes a support substrate 18. The support substrate 18 has a cover 15.

  The cover part 15 in this Embodiment has the recessed parts 61 and 62 in which cross-sectional shape was formed in V shape. The cover portion 15 is formed in a curved shape so as to follow the shape of the housing of the motor 2 between the recess portion 61 and the recess portion 62. The indented portion 61 is formed at the upstream end of the transport path of the printing material.

  Thus, when the conductive member is dropped, the conductive member gathers in the concave portion by forming the concave portion having a V-shaped cross section in the cover portion. The members gathered in the recess can be easily taken out. Thus, by forming a dent part in a cover part, it can prevent that a member falls to the lower side of a cover part. Also, when the member is dropped, it can be easily collected.

  Although the dent part in this Embodiment is formed so that a cross-sectional shape may become V shape, it is not restricted to this form, For example, the cross-sectional shape may be formed in U shape.

  Since configurations, operations, and effects other than those described above are the same as those in the first embodiment, description thereof will not be repeated here.

  In the respective drawings according to the above-described embodiments, the same or corresponding parts are denoted by the same reference numerals.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It is not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and includes all modifications within the scope and meaning equivalent to the terms of the claims.

FIG. 3 is a schematic perspective view when the upper cover and the middle cover of the inkjet printer according to Embodiment 1 are removed. 3 is an enlarged schematic plan view of a portion of a motor for driving a conveyance roller in Embodiment 1. FIG. 3 is an enlarged schematic cross-sectional view of a portion of a motor for driving a conveyance roller in Embodiment 1. FIG. FIG. 10 is an enlarged schematic plan view of a motor portion for driving a conveyance roller in the second embodiment. 6 is an enlarged schematic cross-sectional view of a motor portion for driving a conveyance roller in Embodiment 2. FIG. It is a schematic perspective view of an inkjet printer. It is a schematic perspective view when the upper cover of the inkjet printer in a prior art is removed. It is an expansion schematic plan view of the part of the motor for driving the conveyance roller of the inkjet printer in a prior art.

Explanation of symbols

  1,8,9 Sheet pressing member, 2 motor, 3 opposing roller, 4 inkjet head, 5 housing, 6 frame, 7 transport roller, 11, 18, 91 support substrate, 12 star wheel, 14, 15 cover, 17 screw, 21 motor housing, 22a, 22b terminal, 23a, 23b conductor, 24 motor pin, 25, 26 gear, 27 motor base, 28 shaft, 51 upper cover, 52 lower cover, 53 document presser, 54 discharge tray, 55 glass, 56 operation part, 57 support pillar, 61,62 dent part, 81-83 arrow.

Claims (4)

A sheet pressing member disposed on the downstream side of a position where ink is ejected by the inkjet head in the conveyance path of the substrate;
A motor for driving a transport roller for transporting the substrate,
The motor is disposed on the upstream side of the conveyance path from the sheet pressing member when viewed in plan,
The sheet pressing member, a support substrate formed to extend in the width direction,
A star wheel supported by the support substrate,
The support substrate has a cover portion formed so as to cover the upper side of the terminal of the motor,
The cover is formed in a curved shape so as to follow the shape of the casing of the motor.
An ink jet printer that prevents the terminals from being short-circuited when a conductive member is dropped from the upper side of the cover. A sheet pressing member disposed on the downstream side of a position where ink is ejected by the inkjet head in the conveyance path of the substrate;
A motor disposed on the upstream side of the transport path from the sheet pressing member when viewed in plan,
The sheet pressing member includes a support substrate formed to extend in the width direction,
The said support substrate is an inkjet printer which has a cover part formed so that the upper side of the terminal of the said motor might be covered.   The inkjet printer according to claim 2, wherein the cover has a portion formed in a curved shape so as to follow the shape of the motor.   4. The ink jet printer according to claim 2, wherein the cover portion is disposed at an end portion on the upstream side of the conveyance path, and has a recess portion having a V-shaped or U-shaped cross-sectional shape.

Images