JP2006273519A - Pressing member, transport device equipped with it, and liquid jetting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transport a recording sheet of paper 160 certainly without generating a roller mark with a transporting follower roller 220. <P>SOLUTION: The pressing member comprises a body part 226 in columnar shape, a pair of transporting follower rollers 220 formed at one end of the body part 226 coaxially with the body part 226 and each having an extension part 228 smaller in diameter than the body part 226, a supporting member 230 where the two follower rollers 220 are mounted on a single shaft approximately adjacently and which supports the follower rollers 220 in such a way that the extension parts 228 are mutually positioned outside, and an energizing member 240 to depress the supporting member 230 between the follower rollers 220. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pressing member and a conveying device including the pressing member. More specifically, in a conveying apparatus that conveys an object to be conveyed with at least a pair of rollers, a pressing member for pressing one roller against the other roller, a conveying apparatus including the pressing member, and a liquid ejecting apparatus About.

  A liquid ejecting apparatus that conveys a recording object, which is an object to be conveyed, in a certain conveying direction and moves a liquid ejecting head in a direction intersecting the conveying direction to record a two-dimensional image on the surface of the recording object. is there. The liquid ejecting apparatus includes a transport device that transports an object to be transported.

  As the above-mentioned transport device, there is a transport device that sandwiches and transports an object to be transported with a pair of rollers. The transport device includes a transport drive roller that is rotationally driven by a drive source, a transport driven roller that can freely rotate about an axis parallel to the shaft of the transport drive roller, and a transport driven roller that is driven by the transport drive roller. A load applying unit that presses the transport driven roller against the transport driving roller.

  In this type of transport device, while accurate control of the transport amount is required, it is strongly required that the transport device itself does not damage the object to be transported. Among these requirements, in order to improve the control accuracy of the transport amount, it is desirable to strongly sandwich the object to be transported by the transport driving roller and the transport driven roller. Therefore, the pressing member including the transport driven roller itself is equipped with a strong biasing member, and the transport driven roller is often pressed strongly against the transport driving roller.

  On the other hand, the conveyance driven roller is often formed by combining a plurality of narrow rollers with respect to the conveyance driving roller having the same length as the width of the object to be conveyed. For this reason, the edge part of each roller has contacted the surface of the to-be-conveyed object. If each roller is strongly pressed in such a state, the trace of the edge of each roller may remain on the surface of the conveyed object.

Patent Document 1 below discloses a technique for relaxing the roller marks caused by the transport driven roller having a high pressing force as described above. That is, according to the description of Patent Document 1, it is possible to prevent a high pressure from being locally applied to the conveyed object by covering the conveyed driven roller with the fluorine-containing urethane elastomer material and bringing it into contact with the conveyed object.
Japanese Patent Laid-Open No. 11-314789

  As described above, by covering the surface of the transport driven roller with a flexible material, it is possible to eliminate the roller marks on the recording material. However, the types of objects to be conveyed handled by the conveying device are increasing, and it is constantly demanded that more types of objects to be conveyed can be dealt with reliably without generating a roller trace.

  In order to solve the above problems, as a first embodiment of the present invention, a columnar main body portion and an extension portion formed coaxially with the main body portion at one end of the main body portion and having a smaller diameter than the main body portion, respectively. A pair of rollers, a support member that supports the pair of rollers so that the pair of rollers are mounted substantially adjacent to a single shaft, and the extension portions are located outside each other, and the pair of rollers A pressing member including an urging member that lowers the supporting member is provided. As a result, the edge of the roller that is most strongly pressed when being pressed down by the biasing member approaches the biasing member, and deformation of the support member is reduced. Therefore, it is suppressed that an edge presses a pressed object extremely strongly.

  Further, as one embodiment, in the pressing member, each of the rollers has a columnar core main body portion and one end portion of the core main body portion formed coaxially with the core main body portion and having a smaller diameter than the core main body portion. It includes a hard core member having a core extension and a flexible resin tube attached to the peripheral surface of the core body. As a result, the contact surface that directly contacts the pressed object is formed by the soft flexible resin tube, so that the surface of the transferred object can be transported more reliably without being damaged.

  Furthermore, as another embodiment, in the pressing member, the peripheral surface and the end surface adjacent thereto are smoothly continuous. As a result, an increase in local pressure is suppressed, and the object to be pressed can be more reliably transported without being damaged.

  In addition, as a second form of the present invention, a columnar body whose peripheral surface abuts on the object to be transported, and an extension formed on one end of the body coaxially with the body and having a smaller diameter than the body. A pair of rollers each having a portion, a support member that supports the pair of rollers such that the shafts of the pair of rollers are arranged on a single straight line, and the extension portions are respectively located outside, and a pair of rollers The object to be conveyed is sandwiched between a pair of rollers and a pressing member having an urging member that lowers the support member between the rollers, and is transported while the pair of rollers are rotated. There is provided a conveying device for a sheet-like object to be conveyed provided with a conveying driving roller. Thereby, in the conveyance of a sheet-like recording material, it can convey, without damaging the surface of a conveyance material more reliably.

  Furthermore, as a third form of the present invention, a columnar body portion whose peripheral surface abuts on the object to be conveyed, and one end portion of the body portion formed coaxially with the body portion and having a smaller diameter than the body portion. A pair of rollers each having a portion, a support member that supports the pair of rollers such that the shafts of the pair of rollers are arranged on a single straight line, and the extension portions are respectively located outside, and a pair of rollers The object to be conveyed is sandwiched between a pair of rollers and a pressing member having an urging member that squeezes the supporting member between the rollers, and is rotated to convey the object to be conveyed while the pair of rollers are rotated. There is provided a liquid ejecting apparatus including a transport driving roller and an ejection head that ejects liquid onto an object to be transported conveyed by a transport driven roller. Thereby, the effect similar to the 1st form can be acquired.

  Further, as a fourth embodiment of the present invention, a columnar body portion whose peripheral surface is in contact with the recording material, and an extension formed on one end of the body portion coaxially with the body portion and having a smaller diameter than the body portion. A pair of rollers each having a portion, a support member that supports the pair of rollers such that the shafts of the pair of rollers are arranged on a single straight line, and the extension portions are respectively located outside, and a pair of rollers The recording material is sandwiched between a pair of rollers and a pressing member having an urging member that squeezes the support member between the rollers, and the recording material is conveyed while being rotated together by being driven to rotate. A recording apparatus is provided that includes a conveyance driving roller and a recording head that ejects liquid onto a recording material conveyed by a conveyance driven roller. Thereby, the effect similar to the 1st form can be acquired.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the scope of claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  FIG. 1 is a perspective view illustrating an overview of an ink jet recording apparatus 10 that is one of liquid ejecting apparatuses including a transport apparatus 200 according to the present embodiment. As shown in FIG. 1, the ink jet recording apparatus 10 includes a lower case 100 serving as a base of the entire apparatus, an upper case 110 that forms a casing together with the lower case 100, and a paper attached to the rear part of the lower case 100. A support 120 and a discharge tray 130 formed on the front surface of the lower case 100 are provided. In addition, the ink jet recording apparatus 10 includes a platen 140 that is horizontally disposed inside the lower case 100, a transport device 200 that is formed behind the platen 140, and a carriage 150 that is disposed above the platen 140. Provided inside.

  In the ink jet recording apparatus 10 as described above, the recording paper 160 accommodated in the paper support 120 is sent onto the platen 140 by the transport device 200 and further sent out to the discharge tray 130 by a discharge device (not shown). In the ink jet recording apparatus 10, the carriage 150 reciprocates in a direction perpendicular to the conveyance direction of the recording paper 160 above the platen 140. Accordingly, by alternately performing the reciprocating movement of the carriage 150 as the main scanning and the conveyance of the recording paper 160 as the sub-scanning, the entire upper surface of the recording paper 160 can be scanned by the carriage 150, and ink can be applied to an arbitrary area on the recording paper 160. Can be discharged.

  FIG. 2 is a diagram showing the ink jet recording apparatus 10 shown in FIG. As shown in the figure, the transport apparatus 200 includes a transport driven roller 210 and a transport driven roller 220 that are arranged to face each other, and a support member 230 that supports the transport driven roller 220 from substantially the rear. The transport driving roller 210 is supported by the frame 170 behind the platen 140, and thereby contacts the recording paper 160 from below. The transport driven roller 220 contacts the recording paper 160 from above. Accordingly, the transport driving roller 210 and the transport driven roller 220 sandwich the recording paper 160 from above and below, and transport the recording paper 160 according to the rotation of the transport driving roller 210. In addition, above the platen 140, the carriage 150 reciprocates in a direction orthogonal to the transport direction.

  Here, paying attention to the dimension in the axial direction, the transport driving roller 210 is a single roller longer than the width of the recording paper 160. On the other hand, each conveyance driven roller 220 is pressed over the entire width of the recording paper 160 by mounting a plurality of short conveyance driven rollers 220. The support members 230 each support the pair of transport driven rollers 220 to form the transport driven roller assembly 40.

  FIG. 3 is an enlarged view showing the vicinity of the pressing member 30 in the transport apparatus 200 shown in FIG. In addition, in order to clarify the positional relationship with other drawings, a part of the platen 140 is also shown in the same drawing.

  As shown in the figure, each pressing member 30 includes a pair of transport driven rollers 220, a support member 230 that supports them, and an urging force that presses the transport driven roller 220 against the transport drive roller 210 via the support member 230. Member 240. The front end of the support member 230 has a side bearing portion 234 formed on both sides thereof, and a center bearing portion 236 formed in the center of the side bearing portion 234.

  A pair of conveying driven rollers 220 is inserted into one shaft bearing 234 from the one side bearing portion 234 through the central bearing portion 236 to the other side bearing portion 234 by inserting a shaft that is not visible in the figure. It is attached to be freely rotatable. Further, the support member 230 is mounted so as to be able to roll with respect to an axis parallel to the axis of the transport driving roller 210 by being supported by the shaft 170 from the frame 170.

  Further, the front end of the biasing member 240 abuts on the central bearing portion 236 of the support member 230 from above. The rear end of the urging member 240 is fixed to a frame 170 (not shown), and the conveyance driven roller 220 is pressed down toward the conveyance drive roller 210 via the central bearing portion 236.

  FIG. 4 is a perspective view showing the transport driven roller assembly 40 in which the transport driven roller 220 and the support member 230 shown in FIG. As shown in the figure, the support member 230 is a member integrally formed by injection molding, and is reinforced by a large number of reinforcing ribs 238 and has high rigidity.

  Further, a groove portion 231 is formed on the upper surface of the central bearing portion 236 to receive the reduction by the urging member 240 and prevent the position to be reduced from shifting. As described above, the common shaft of the pair of transport driven rollers 220 is inserted into the central bearing portion 236. Therefore, the pressing force by the biasing member 240 is applied to the transport driven roller 220 almost directly via the central bearing portion 236 and the shaft.

  FIG. 5 is a view showing a state in which the transport driven roller assembly 40 shown in FIG. 4 is viewed from the front in the direction of arrow A in FIG. Here, the shaft 221 is slightly visible between each transport driven roller 220 and the central bearing portion 236. The urging member 240 applies a strong pressing force to the conveyance driven roller assembly 40 from above.

  FIG. 6 is a sectional view independently showing the shape of the transport driven roller 220 mounted on the transport driven roller assembly 40 shown in FIG. As shown in the figure, the conveyance driven roller 220 is formed of a hard material such as POM (polyoxymethylene resin), which is a core member 222 that serves as a core, and a flexible member that is attached to the surface of the core member 222. A conductive resin tube 224. As a material of the flexible resin tube 224, for example, a fluorine-containing urethane resin or the like is used. A shaft hole 223 that penetrates the shaft 221 is formed in the center of the core member 222.

  Further, focusing on the shape of the core member 222, it can be seen that a small-diameter extension 228 is formed on the right side of the large-diameter main body 226 to which the flexible resin tube 224 is attached. . The extension 228 is a portion with which the ejector comes into contact when the core member 222 is manufactured by injection molding. Because of the extension 228, the overall shape of the transport driven roller 220 formed by the core member 222 is asymmetric on the left and right. Further, the flexible resin tube 224 attached to the main body portion 226 of the core member 222 having such a shape is also in a state where the center is offset to the opposite side to the extension portion 228.

  Further, a pair of steps 229 are formed on the peripheral surface of the main body 226 of the core member 222, and both sides have a large diameter. The flexible resin tube 224 is attached to the core member 222 so as to fill a gap between the pair of steps 229 without any gap, and is formed so that the attachment position does not shift laterally. In such a transport driven roller 220, the surface of the flexible resin tube 224 serves as a contact surface 227 that directly presses the surface of the recording paper 160.

  FIG. 7 shows a state in which the urging member 240 applies a pressing force to the transport driven roller assembly 40 shown in FIG. In addition, what is shown by the arrow P in the figure is the pressing force by the urging member 240.

  The pressing force P reduces the groove portion 231 formed in the central bearing portion 236 at the center of the support member 230. At this time, as described above, the rolling force by the biasing member 240 is considerably high, and the support member 230 and the shaft 221 are inevitably deformed as shown in FIG. However, since the transport driven roller 220 is in contact with the transport drive roller 210 at the lower side, even if it is pressed downward, it does not drop further. Therefore, each conveyance driven roller 220 is in a state where the outer end of the contact surface 227 is lifted with the inner edge of the contact surface 227 as a fulcrum.

  As a result, the transport driven roller 220 is extremely strongly pressed against the transport drive roller 210 at the inner edge portion of the contact surface 227, and is relatively high in this portion due to a reduction in effective contact area. Pressure is generated. The generation of the roller marks on the recording paper 160 starts from a region where the local pressure is applied.

  However, as shown in FIGS. 6 and 7, in the transport driven roller assembly 40, the extension portions 228 of the core members 222 of the transport driven rollers 220 are attached to the support member 230 so as to be outside each other. As a result, the distance D between the inner edge portion of the contact surface 227 that becomes a fulcrum during deformation and the central bearing portion 236 that receives the pressing force of the urging member 240 is shortened, and the outer end portion of the transport driven roller 220 is reduced. The force acting to lift is relatively reduced.

  Accordingly, the inclination of the entire conveyance driven roller 220 becomes gentle, and the effective contact area with the conveyance driving roller 210 at the inner edge of the contact surface 227 increases. For this reason, the local press of the edge of the contact surface 227 of the conveyance driven roller 220 is relieved. As described above, the extension portion 228 of the core member 222 is disposed on the outer side, and the conveyance driven roller 220 is brought into contact with the conveyance driving roller 210 on the inner side, so that the recording sheet 160 is more reliably generated without generating a roller trace. Can be transported.

  FIG. 8 is a cross-sectional view showing another form of the transport driven roller 220 that can be used in the pressing member 30 and the transport apparatus 200 including the press member 30 as described above. In addition, the same referential mark is attached | subjected to the member which is common in FIG. 6, and the overlapping description is abbreviate | omitted.

  As shown in the figure, the conveyance driven roller 220 has chamfered portions 225 at both ends of a peripheral surface that becomes a contact surface 227 in a flexible resin tube 224 attached to a main body portion 226 of the core member 222. Is formed. As a result, the local pressure applied to the recording paper 160 by the edge of the contact surface 227 is further relaxed.

  As described above in detail, according to the present invention, deformation of the support member 230 in the pressing member 30 can be reduced, and an increase in local pressure at the edge of the transport driven roller 220 can be suppressed. Therefore, it is possible to convey the object to be conveyed more reliably without generating a roller mark. Such a pressing member 30 can be widely applied to various transport devices that transport a transported object between rollers. Note that there are a wide variety of devices in which a conveyance device using a roller is used, such as the inside of a copying machine or a page printer.

  Moreover, the conveying apparatus provided with this pressing member can be used in various liquid ejecting apparatuses. Specific examples of the liquid ejecting apparatus include a color material ejecting apparatus in the manufacture of a color filter for a liquid crystal display, an electrode forming apparatus in the manufacture of an organic EL display, an FED (surface emitting display), etc., or a sample ejecting head used for biochip manufacturing. However, it is not limited to these.

  As mentioned above, although demonstrated with reference to embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 is a perspective view of an overview of an ink jet recording apparatus 10 that is one embodiment. FIG. FIG. 2 is a perspective view showing an internal mechanism 20 of the ink jet recording apparatus 10. The perspective view which expands and shows the press member 30 periphery of the conveying apparatus 200. FIG. FIG. 3 is a perspective view showing a conveyance driven roller assembly 40 extracted from the pressing member 30. The figure which shows a mode that the conveyance driven roller assembly 40 was seen from the front. The figure which shows the state which the conveyance driven roller assembly 40 deform | transformed from the same viewpoint as FIG. Sectional drawing which shows the conveyance driven roller 220 independently. FIG. 10 is a cross-sectional view showing another form of the transport driven roller 220.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inkjet recording device, 20 internal mechanism, 30 pressing member, 40 conveyance driven roller assembly, 100 lower case, 110 upper case, 120 paper support, 130 discharge tray, 140 platen, 150 carriage, 160 recording paper, 170 frame, 200 Conveying Device, 210 Conveying Driving Roller, 220 Conveying Driven Roller, 221 Axis, 222 Core Member, 223 Shaft Hole, 224 Flexible Resin Tube, 225 Chamfered Part, 226 Main Body Part, 228 Extension Part, 229 Step, 230 Support Member 231 groove portion, 232 shaft portion, 234 side bearing portion, 236 central bearing portion, 238 reinforcing rib, 240 biasing member

Claims (6)

A pair of rollers each having a columnar main body and an extension formed coaxially with the main body at one end of the main body and smaller in diameter than the main body;
A support member that supports the pair of rollers so that the pair of rollers is mounted substantially adjacent to a single shaft, and the extensions are located on the outside;
A pressing member comprising: an urging member that presses down the support member between the pair of rollers.   Each of the rollers is a hard core having a cylindrical core body and a core extension formed coaxially with the core body at one end of the core body and having a smaller diameter than the core body. The pressing member according to claim 1, comprising a member and a flexible resin tube attached to the peripheral surface of the core body portion.   The pressing member according to claim 2, wherein a peripheral surface of the flexible resin tube and an end surface adjacent to the peripheral surface are smoothly continuous. A pair of body portions each having a cylindrical shape whose peripheral surface is in contact with an object to be conveyed and an extension portion formed coaxially with the body portion at one end of the body portion and having a smaller diameter than the body portion. roller,
A support member for supporting the pair of rollers such that the shafts of the pair of rollers are arranged on a single straight line, and the extension portions are respectively located outside; and
A pressing member having an urging member for reducing the support member between the pair of rollers;
A transport apparatus for a sheet-like transported object, comprising: a transport driving roller configured to sandwich the transported object between the pair of rollers and rotate to drive the transported object while rotating the pair of rollers. . A pair of body portions each having a cylindrical shape whose peripheral surface is in contact with an object to be conveyed and an extension portion formed coaxially with the body portion at one end of the body portion and having a smaller diameter than the body portion. roller,
A support member for supporting the pair of rollers such that the shafts of the pair of rollers are arranged on a single straight line, and the extension portions are respectively located outside; and
A pressing member having an urging member for reducing the support member between the pair of rollers;
A conveyance driving roller that conveys the conveyance object while rotating the pair of rollers by sandwiching the conveyance object between the pair of rollers and being driven to rotate;
A liquid ejecting apparatus comprising: an ejecting head that ejects liquid onto the object to be transported transported by the transport driving roller. A pair of body portions each having a cylindrical shape whose peripheral surface is in contact with the recording material and an extension portion formed coaxially with the body portion at one end of the body portion and having a smaller diameter than the body portion. roller,
A support member for supporting the pair of rollers such that the shafts of the pair of rollers are arranged on a single straight line, and the extension portions are respectively located outside; and
A pressing member having an urging member for reducing the support member between the pair of rollers;
A conveyance driving roller that conveys the recording material while rotating the pair of rollers by sandwiching the recording material between the pair of rollers and being driven to rotate;
A recording apparatus comprising: a recording head that ejects ink onto the recording material conveyed by the conveyance driving roller.

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