JP2005212129A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer which can bring about a high-quality recording result by preventing a wrinkle from occurring in an ink film for use in recording. <P>SOLUTION: A first film wrinkle removing member 11, which can be brought into sliding contact with the traveling ink film 21 in a head-down, is formed near the upstream side, in the carrying direction of the ink film 21, of a heating element of a line thermal head 2. A second film wrinkle removing member 12, which is composed of an electrostatic attraction film with excellent electrostatic charging properties, whose leading end is positioned near the upstream side, in the carrying direction of the ink film 21, of the member 11, and which is brought into surface contact with the ink film 21 in the head-down, so as to be supported in such a manner as to be capable of attracting the ink film 21, is arranged in a printer body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a printer that performs a desired recording by transferring ink of an ink film onto a sheet by selectively generating heat from a plurality of heating elements of a thermal head, and more particularly to the entire region in the row direction in the recording range of a recording sheet. The present invention relates to a printer equipped with a line thermal head in which a plurality of heating elements are arranged in a straight line so as to face each other.

  In general, a line thermal head as a recording head mounted on a thermal printer or the like that performs recording using an ink film forms a plurality of heating elements made of heating resistors in a line on a substrate, and according to recording information, By selectively energizing the heat generating element to generate heat, the ink of the ink film is melted and transferred to a recording paper such as plain paper or OHP paper to perform desired recording.

  In such a conventional line thermal head, a heat insulating layer is formed on the surface of the heat-dissipating substrate, and a convex portion protruding at a predetermined height is formed in the vicinity of the tip of the upper surface of the heat insulating layer. Yes. Further, a heating resistor is laminated on the upper surface of the heat insulating layer including the convex portion, and a voltage is applied to the heating resistor on the front end side and the base end side of the heating resistor, respectively. Common electrodes and individual electrodes are formed. A plurality of heating elements in the form of dots are formed in a straight line at a portion sandwiched between the common electrode and each individual electrode of the heating resistor.

  A driver IC chip (hereinafter referred to as an IC chip) connected to the common electrode and the individual electrodes is disposed on the base end side of the substrate. The IC chip is covered and protected by a sealing member made of a sealing resin material.

  In such a conventional line thermal head, the substrate is mounted on the printer main body by being attached to the head mounting base, and the heating element is moved through the ink film and the recording paper by rotating the head mounting base. The center of the portion where the heat generating element and the platen come into contact with each other in the conveyance direction of the recording paper is referred to as a “contact position”).

  When recording is performed using the line thermal head, the heating element of the line thermal head is brought into contact with the platen via the ink film and the recording paper, and the ink film and the paper are transported, and a plurality of recordings are performed based on the recording information. By selectively heating the heat generating element and heating the ink film, the ink of the ink film is transferred to a recording sheet, and characters, images, and the like are recorded on the sheet (see, for example, Patent Document 1).

  By the way, in printers equipped with the above-described line thermal head, there is a demand for miniaturization as in other electrical products. There is also a request for cost reduction. Therefore, the size of the printer in the direction perpendicular to the arrangement direction of the heating elements of the line thermal head substrate is made much smaller than that of the conventional line thermal head, thereby realizing the downsizing of the printer. It has been studied to reduce the cost by increasing the number of line thermal head substrates cut out from one mother substrate.

  As described above, when the dimension of the substrate in the direction perpendicular to the arrangement direction of the heat generating elements is reduced, the sealing member that protects the IC chip comes close to the heat generating elements on the upper surface of the substrate. Therefore, in a printer equipped with a line thermal head in which the dimension in the direction perpendicular to the arrangement direction of the heating elements on the substrate is reduced, the contact angle of the line thermal head when the line thermal head contacts the platen, that is, The angle formed by the substrate of the line thermal head with respect to the tangent of the platen at the contact position between the line thermal head and the platen is adjusted so as to be larger than before, and only the heating element is appropriately applied to the platen. It is necessary to configure so that they abut.

Japanese Patent Laid-Open No. 10-129023

  However, as the contact angle of the line thermal head to the platen increases, the space formed between the platen and the substrate of the line thermal head also increases. In this large space, the transport of the ink film supplied to the recording position where the heating element of the line thermal head and the platen come into contact is likely to be unstable, and the ink film used for recording is loosened. There was a concern that wrinkles were likely to occur and the recording results were adversely affected. In particular, the wrinkles are likely to occur in a recording environment where the temperature and humidity are high.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a printer that can prevent wrinkling of an ink film used for recording and obtain a high-quality recording result.

  In order to achieve the above-described object, in the printer of the present invention, the first film wrinkle removal member slidably contactable with the ink film traveling when the head is down is located upstream of the heat generating element of the line thermal head in the ink film transport direction. It is formed in the vicinity and is made of an electrostatic adsorption film having high electrostatic chargeability, and its tip is positioned in the vicinity of the first film wrinkle removal member on the upstream side in the transport direction of the ink film. A second film wrinkle removing member that is in surface contact with the ink film and is supported so as to be able to adsorb the ink film is disposed in the printer main body.

  The first film wrinkle removing member is a protruding member formed in a line shape parallel to the arrangement direction of the heat generating elements.

  Furthermore, the first film wrinkle removal member is formed of an elastic body.

  According to the printer of the present invention, the tip of the second film wrinkle removal member that is cantilevered is brought into surface contact with the back surface of the ink film that faces the thermal head, and the second film wrinkle is moved when the ink film travels. The ink film can be smoothly adsorbed on the surface of the second film wrinkle removal member by using the electrostatic attraction force of the removing member, and wrinkles generated on the ink film can be extended.

  Further, on the downstream side in the transport direction of the ink film, the second film wrinkle removal member extends the wrinkles of the ink film, and on the back surface of the removed ribbon film facing the thermal head, the line thermal head While the formed first film wrinkle removing member is brought into contact with the ink film, tension is applied to the recording sheet conveyed between the ink film and the platen to extend the wrinkles, and the ink film wrinkles are formed on the ink film. By acting to push back toward the upstream side in the transport direction, it is possible to prevent the flange from reaching the contact position (recording position) where the heating element of the thermal head contacts the platen via the ink film and the recording paper. . In addition, in the printer of the present invention, the first film wrinkle removal member is positioned immediately in front of the heating element, which is upstream in the transport direction of the ink film. The ink film can be stretched again, and the ink film becomes slack again before reaching the recording position, thereby reducing the possibility of wrinkles.

  Further, the first film wrinkle removing member may be a protrusion-like member formed in a line in the gap between the heating element and the sealing member on the substrate surface of the line thermal head in parallel with the arrangement direction of the heating elements. By doing so, wrinkles generated in the ink film can be reliably performed in the arrangement direction of the heat generating elements, that is, in the width direction of the ink film.

  Furthermore, by forming the first film wrinkle removal member with an elastic body, the ink film can be pressed against the recording paper with an appropriate pressing force that does not impede traveling.

  Then, the base end portion of the second film wrinkle removal member is fixed to the head mounting base and supported so as to face the space portion formed between the thermal head and the platen. In a printer equipped with a thermal head whose dimensions in the direction orthogonal to the arrangement direction are reduced, even if the contact angle of the thermal head when the thermal head contacts the platen is increased, the second film wrinkle removal member is By facing the space formed between the thermal head and the platen, the space formed between the platen and the substrate of the thermal head can be narrowed, and the transported ink film is violent and unstable. High quality because the ink film can be securely adsorbed to the surface of the second film wrinkle removal member. It is possible to obtain a printed result.

  The present invention will be described below with reference to embodiments shown in the drawings.

  FIG. 1 is a front view showing a configuration of a main part in a recording state of a line printer (hereinafter simply referred to as a printer) as a printer according to the present invention.

  A platen roller 1 as a platen is rotatably disposed in the main body of the printer of this embodiment. Above the platen roller 1, a line thermal head 2 as a recording head has a heating element 3 formed so as to be aligned on the recording surface facing the outer peripheral surface of the platen roller 1, and the longitudinal direction of the platen roller 1. Are arranged so as to extend in a direction parallel to the axial direction.

Here, the line thermal head 2 in the printer of this embodiment is provided with a substrate 4 with good heat dissipation, and a heat insulating layer (not shown) made of glaze or the like with high heat insulating properties is formed on the upper surface of this substrate. ing. In the vicinity of the tip of the upper surface of the heat retaining layer, a convex portion 5 is formed by partially projecting the surface by a photolithographic technique or the like. A heating resistor (not shown) made of Ta—N, Ta—SiO ₂ or the like is laminated on the upper surface of the heat insulating layer including the convex portions 5. A common electrode (not shown) and individual electrodes (not shown) for applying a voltage to the heating resistor are respectively formed on the distal end side and the base end side of the substrate 4 of the heating resistor. It is laminated and patterned by sputtering of Au or the like and photolithography technology. A plurality of heating elements 3 are formed in a dot-like arrangement in the portion sandwiched between the common electrode and the individual electrodes of the heating resistor, and the line thermal head 2 is set at a predetermined position during recording. The heating element 3 can come into contact with the platen roller 1 via the ink film 21 (shown by a one-dot chain line in FIG. 1) and the recording paper 22 (shown by a two-dot chain line in FIG. 1) when tilted at a contact angle. It has become. Note that the shape of the convex portion 5 is appropriately designed in a shape suitable for contact with the platen roller 1 from the contact angle, contact position, etc. of the line thermal head 2.

  Further, a driver IC chip (not shown) connected to the common electrode and the individual electrodes (hereinafter referred to as an IC chip) is disposed on the substrate 4. The IC chip controls the amount of heat generated by the heating element 3 by controlling the voltage of energization pulses applied to the plurality of heating elements 3, for example. The IC chip is covered and protected by a sealing member 6 made of a sealing resin material in order to protect it from external factors such as mechanical, thermal stress and moisture. As the form of the IC chip and the sealing member 6, COB (Chip On Board) in which the IC chip is directly mounted on the common electrode and the individual electrode on the substrate 4 and the mounting region is sealed with the sealing member 8 is also used. Alternatively, the IC chip may be packaged with a sealing member and mounted on the line thermal head 2.

  Further, the upper surfaces of the heating element 3 and the common electrode and the individual electrodes are hard ceramics such as Si—O—N and SiAlON, which have excellent oxidation resistance and wear resistance, in order to prevent their oxidation and wear. A protective layer (not shown) made of is coated with a predetermined thickness by sputtering or the like.

  Further, an external terminal portion (not shown) composed of an FPC (flexible substrate) connected to the terminal portion of the IC chip is drawn out from the heat insulating layer at the other end portion of the substrate 4 of the line thermal head 2. Yes.

  The line thermal head 2 is attached to a head mounting base 7 made of a metal material such as an aluminum alloy that is lightweight and excellent in heat dissipation (thermal conductivity), and heat is stored in the heat retaining layer during recording. Heat is dissipated through the substrate. The head mount 7 is attached to the tip of a head lever (not shown) whose base end is pivotally supported by a support shaft (not shown), and the head lever is driven by a driving force from a driving source (not shown). And a head-down position where the line thermal head 2 mounted on the head mount 7 is brought into contact with the platen roller 1 and a head-up position separated from the platen roller 1. These two positions are selectively taken.

  Further, in the present embodiment, the first film that is in sliding contact with the traveling ink film 21 when the head is down is located near the heating element on the upstream side in the transport direction of the ink film 21 used for recording by the line thermal head 2. A wrinkle removal member is formed. As shown in FIG. 1, the first film wrinkle removal member 11 is a protrusion-like member made of an elastic material such as low-viscosity rubber, sponge, or poron, which is formed in a line shape parallel to the arrangement direction of the heating elements. Has been.

  As shown in FIG. 1, the recording paper 22 and the ink film 21 are sequentially supplied from the platen roller 1 side between the platen roller 1 and the line thermal head 2 in the head down state. . The contact position between the line thermal head 2 and the platen roller 1 in the head-down state in which the line thermal head 2 is in contact with the platen roller 1 with a predetermined contact force is used for recording ink on the ink film 21. The recording position PP is to be transferred to the recording paper 22 to be transferred.

  Further, a transport path is formed upstream of the recording position PP in the transport direction of the ink film 21 on the head mounting base 7 so that the ink film 21 used for recording does not come into contact with any part other than the heating element 3. An ink film guide 9 is formed. Further, on the downstream side of the recording position PP in the transport direction of the ink film 21 of the head mounting base 7, a peeling member 10 for peeling the ink film 21 used for recording from the recording paper is formed.

  In the printer of this embodiment, the head mounting base 7 is further provided with a second film wrinkle removal member 12 for preventing the ink film 21 from wrinkling.

  The second film wrinkle removal member 12 is formed of a sheet material made of an electrostatic adsorption film made of a resin having high electrostatic chargeability such as polyvinyl chloride. Furthermore, in the present embodiment, the second film wrinkle removal member 12 is formed of a sheet material having a low surface friction coefficient, and by improving the slipperiness in the direction (width direction) perpendicular to the transport direction of the ink film 21, The wrinkles generated in the ink film 21 are formed more easily. Furthermore, in the present embodiment, the second film wrinkle removal member 12 has a substantially rectangular shape in which the length of the edge is approximately the same as the line length of the heating element 3. One of the opposing sides of the second film wrinkle removal member 12 is fixed to the head mount 7 as a base end portion 12a of the second film wrinkle removal member 12, and faces the one end side. Covering the sealing member 6 exposed on the surface of the line thermal head 2 with the other end side to be a tip portion 12b facing a space formed between the line thermal head 2 and the platen roller 1, The ink film 21 is cantilevered so as to be positioned immediately before the first film wrinkle removal member 11 on the upstream side in the transport direction of the ink film 21.

  The ink film 21 has a width corresponding to a recording width (recording width) that is a dimension in the row direction of the recording range of the paper 22, and can be transported together with the paper 22. At the time of recording, the paper 22 is fed out from the ink film cartridge 23 disposed on the sending side (the right side in FIG. 1) upstream of the recording position PP in the transport direction of the paper 22 and guided to the ink film guide 9. The first film wrinkle removing member 11 and the second film wrinkle removing member 12 are supplied to the recording position PP in a state in which the slack of the ink film 21 and wrinkles caused by the slack are removed, and are used for recording. It is configured to be sequentially wound on the winding side (the left side in FIG. 1) which is the downstream side.

  At the time of recording, the heating element 3 generates Joule heat and selectively generates heat by selectively applying a voltage to the heating element 3 based on the recording information in a state where the line thermal head 2 is headed down. To do. Due to the heat generated by the heat generating element 3, the ink film 21 is partially heated, and ink (not shown) of the ink film 21 is transferred so that characters or images can be recorded on the recording paper 22 positioned on the platen roller 1. It has become.

  In this embodiment configured as described above, when the line thermal head 2 is in the head down state, the second film wrinkle removal member 12 faces the line thermal head 2 of the traveling ink film 21. The ink film 21 can be adsorbed by surface contact with the surface. Then, by using the electrostatic attraction force of the second film wrinkle removal member 12, the running ink film 21 is smoothly adsorbed to the surface of the second film wrinkle removal member 12 facing the platen roller 1, and the ink film By extending the wrinkles generated in the ink 21, the wrinkles of the ink film 21 can be extended and removed.

  In the present embodiment, the first film wrinkle removal member 11 formed on the line thermal head 2 is further moved immediately before the heating element on the downstream side in the ink film conveyance direction. It is brought into contact with the surface facing the line thermal head 2 and is brought into sliding contact with the travel of the ink film 21. At that time, the first film wrinkle removing member 11 applies tension to the ink film 21, stretches the wrinkles so as to press the ink film 21 against the recording paper 22, and moves the wrinkles of the ink film 21 in the transport direction of the ink film. By pushing back to the upstream side, the wrinkles can be prevented from reaching the contact position (recording position) where the heating element of the line thermal head 2 contacts the platen 1 via the ink film 21 and the recording paper 22.

  In the printer of the present embodiment, the first film wrinkle removal member 11 formed on the line thermal head 2 is disposed in the vicinity (immediately before) of the heating element 3 on the upstream side in the transport direction of the ink film 21. Thus, the wrinkle of the ink film 21 can be extended in the immediate vicinity of the contact position (recording position PP) where the heating element of the line thermal head 2 contacts the platen roller 1 via the ink film and recording paper. In the meantime, it is possible to reduce the possibility that the ink film 21 is slack again and wrinkles are generated.

  In addition, since the first film wrinkle removal member 11 in the present embodiment is a protruding member formed in a line shape parallel to the arrangement direction of the heat generating elements, wrinkles generated in the ink film 21 are generated in the heat generating elements. In the arrangement direction, that is, in the width direction of the ink film 21.

  Furthermore, by forming the first film wrinkle removal member 11 in the present embodiment by an elastic body such as low-viscosity rubber, the ink film 21 is pressed against the recording paper 22 with an appropriate pressing force that does not hinder running. It becomes possible.

  In addition, this invention is not limited to the said embodiment, A various change can be made as needed.

  The ink film used with the line thermal head of the present invention is obtained by applying a heat-meltable ink or heat-sublimation ink to a base film such as a plastic film, and is a concept including an ink ribbon and an ink sheet.

FIG. 2 is a schematic cross-sectional view showing the main configuration of the printer of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Platen roller 2 Line thermal head 3 Heating element 4 Board | substrate 5 Protruding part 6 Sealing member 7 Head mounting base 9 Ink film guide 10 Peeling member 11 1st film wrinkle removal member 12 2nd film wrinkle removal member 21 Ink film 22 Recording paper PP recording position

Claims (3)

A heat insulating layer formed with a convex portion that partially protrudes on the front end side of the upper surface of the substrate, a plurality of heat generating elements formed on the upper surface of the convex portion, an individual electrode for supplying power to each of the heat generating elements, and a common An ink film comprising a line thermal head that is protected by covering at least a part of the surface of the substrate on the base end side of the heat generating element with a sealing member, and is stacked in order from the line thermal head side. A printer that performs a desired recording by selectively applying a voltage to the heating element in a state where the line thermal head is brought into contact with a platen via a recording sheet,
A first film wrinkle removal member that is slidable against the ink film that travels when the head is down is formed in the vicinity of the heat generating element of the line thermal head on the upstream side in the transport direction of the ink film, and
The ink film is made of an electrostatically adsorbing film having high electrostatic chargeability, and its front end portion is positioned in the vicinity of the upstream side in the transport direction of the ink film of the first film wrinkle removing member, and comes into surface contact with the ink film when the head is down. A printer, wherein a second film wrinkle removal member supported so as to be capable of adsorbing is disposed in the printer main body.   2. The printer according to claim 1, wherein the first film wrinkle removing member is a protrusion-like member formed in a line shape parallel to the arrangement direction of the heat generating elements. The printer according to claim 1, wherein the first film wrinkle removing member is formed of an elastic body.