JP2009167015A - Roller device for transporting and recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller device for transporting various materials having different properties, capable of adjusting the positional relation between a driving roller and a follower roller for transporting according to the sort of the material to be transported and adopting a transport state suitable to properties of the material to be transported. <P>SOLUTION: The roller device for transporting is equipped with the driving roller 19 to give a transporting force to the material to be transported, the follower roller 37 to make following rotation after the rotation of the driving roller, an energizing member 31 to press the follower roller to the driving roller, and a roller moving mechanism 41 to put the two rollers in relative displacement. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention includes a conveyance driving roller that applies a conveyance force to a material to be conveyed, a conveyance driven roller that is driven to rotate by the conveyance drive roller, and the conveyance driven roller that presses the conveyance driven roller toward the conveyance drive roller. The present invention relates to a conveying roller device including a biasing member and a recording apparatus including the conveying roller device.
Here, the “recording apparatus” is a concept including a printer (line printer, serial printer, etc.), a facsimile, a copying machine, and the like.

  Hereinafter, an ink jet printer which is an example of a recording apparatus will be described as an example. As shown in Patent Document 1 below, in a conventional inkjet printer, a conveyance roller device that guides a fed sheet to a recording position by a recording head is basically a pair of a conveyance driving roller and a conveyance driven roller. It is configured. The positional relationship between the transport driving roller and the transport driven roller is fixed.

  Considering the properties of plain paper that swells and bends easily due to ink impregnation, in order to avoid the problem of paper head rubbing at the recording position under the recording head, the so-called paper is “reversely warped” on the platen surface. The conveyance drive roller and the conveyance driven roller are configured in the arrangement structure to be pressed.

  That is, it is configured in a relative arrangement in which the position of the transport driven roller is positioned on the downstream side in the paper transport direction from the position of the transport drive roller. As a result, the sheet nipped and conveyed by the conveyance driven roller and the conveyance driving roller is conveyed in a posture (reverse warping state) in which the starting edge is pressed onto the platen located below the recording position. Accordingly, since the recording material is pressed against the platen under the recording head, the head rubbing problem is prevented.

On the other hand, when the recording surface is coated, and the special paper is stiffer than the plain paper and has high rigidity, the deflection of the paper due to the swelling of the ink is not as problematic as the plain paper. On the other hand, in the case of dedicated paper, execution of recording with higher image quality than plain paper is required. For this reason, it is required that the sheet is conveyed with high sheet feeding accuracy, and it is desirable that a conveyance mode in which a load is not applied to the sheet as much as possible in the sheet conveyance path.
Japanese Patent Laid-Open No. 2002-19204

  The arrangement structure called the “reverse warp” of the transport driving roller and the transport driven roller forcibly biases the original paper transport path to the platen side, so the load on the transported paper Is big. Conversely, if the position of the transport driven roller is changed to the same level as the transport drive roller by positioning it upstream of the paper transport direction, the transport load will be reduced, so an improvement in the image quality of the dedicated paper can be expected. However, when plain paper is used, there is a problem of head rubbing due to deflection of the paper due to the swelling of the ink.

  An object of the present invention is to adjust the positional relationship between a driving roller for conveyance and a driven roller for conveyance in accordance with the type of material to be conveyed in a conveying roller device that conveys different types of materials to be conveyed having different properties. Therefore, an object of the present invention is to provide a transport roller device that can take a transport state that matches the properties of the transported material, and a recording apparatus that includes the transport roller device.

  In order to solve the above problems, a transport roller device according to a first aspect of the present invention includes a transport drive roller that imparts transport force to a material to be transported, and a transport driven roller that is driven to rotate by the transport drive roller. And a biasing member that presses the transport driven roller toward the transport drive roller, and a roller moving mechanism that relatively displaces the transport drive roller and the transport driven roller. It is.

  According to this aspect, since the driving roller for conveyance and the driven roller for conveyance can be relatively displaced by the roller moving mechanism, the driving roller for conveyance and the driven roller for conveyance according to the type of recording material to be conveyed. It becomes possible to adjust the positional relationship of. Therefore, it is possible to adopt a conveyance state that matches the properties of the material to be conveyed.

  According to a second aspect of the present invention, in the conveyance roller device according to the first aspect, the roller moving mechanism is configured such that a position of the relative displacement is set according to a type of a material to be conveyed. To do.

  According to this aspect, depending on the type of material to be transported, for example, a plain paper is switched between a transport state that does not cause a head rubbing problem and a special paper is transported with high feed accuracy. Can be taken. Therefore, it is possible to realize good conveyance suitable for each type of material to be conveyed.

  According to a third aspect of the present invention, in the conveyance roller device according to the second aspect, the conveyance driven roller is conveyed by a first driven roller provided on the downstream side in the conveyance direction, and the first driven roller. A second driven roller provided on the upstream side in the direction, and when the first transported material is transported, the second driven roller and the transport drive roller cooperate with each other to transport the first transported material. When transporting and transporting a second transported material having a higher elasticity than the first transported material, the first driven roller and the transport driving roller cooperate to transport the second transported material. It is what.

  According to this aspect, when the first transported material is transported, the first driven roller can be brought into contact with the first transported material on the downstream side in the transport direction from the second driven roller. That is, the first driven roller can function as a so-called auxiliary roller. For example, it can function as an auxiliary roller that presses the first transported material against the platen side facing the recording head. Therefore, head rubbing can be reduced when transporting the first transported material.

Furthermore, since it functions as an auxiliary roller that presses against the platen side, so-called cockling, which is a waveform deformation caused by the first conveyed material being applied to the ink droplets ejected from the recording head, can be reduced.
Further, when the second material to be conveyed is conveyed, the roller displacement mechanism causes the relative displacement, and the first driven roller can be paired with the conveying drive roller to function as a conveying roller pair. That is, the auxiliary roller can be retracted. Therefore, there is no possibility that the urging force as the auxiliary roller acts on the second conveyed material, and there is no possibility that the frictional resistance due to being pressed against the platen increases. As a result, when transporting the second transported material, it is possible to maintain a transport state with high feed accuracy.

According to a fourth aspect of the present invention, in the conveying roller device according to the third aspect, when the first material to be conveyed is conveyed, the first driven roller is located downstream of the second driven roller in the conveying direction. The first contacted material is in contact with the first transported material.
According to this aspect, when the first material to be conveyed is conveyed, the first driven roller can function as the auxiliary roller.

According to a fifth aspect of the present invention, in the transport roller device according to the third or fourth aspect, when transporting the second material to be transported, the second driven roller is transported in the transport direction from the first driven roller. The second conveyed material is guided to the nip point between the first driven roller and the conveying driving roller on the upstream side.
According to this aspect, when transporting the second transported material, the second driven roller can function as the second transport material guide member.

  According to a sixth aspect of the present invention, in the transport roller device according to any one of the first to fifth aspects, the roller moving mechanism transports the transport driven material to the transport driven roller. It is configured to be displaced along the direction.

  According to this aspect, a change in the relative position between the transport driving roller and the transport driven roller can be realized by a relatively simple configuration, and the transport drive roller serving as a reference need not be moved. Accuracy is improved. Further, since the conveyance driven roller is configured to be displaced along the conveyance direction of the material to be conveyed, for example, when the conveyance driven roller is displaced to the upstream position, the degree of the “reverse warp” is reduced. It is suitable for special paper with little path load, and on the other hand, when the driven roller for conveyance is displaced to the downstream position, the degree of “reverse warp” is increased to make it suitable for plain paper that does not cause head rubbing. be able to.

  According to a seventh aspect of the present invention, in the conveying roller device according to any one of the first to sixth aspects, the roller moving mechanism includes the conveying driving roller and the conveying driven roller. The urging force transmitted from the urging member to the driven roller for conveyance is changed by relative displacement.

  According to this aspect, by adjusting the positional relationship between the transport driving roller and the transport driven roller, it is possible to adjust the nip pressure with respect to the transported material and the transport force of the recording material different depending on the nip pressure. Also from this point, it is possible to realize conveyance according to the type of material to be conveyed, that is, the properties.

  According to an eighth aspect of the present invention, in the transport roller device according to the seventh aspect, the roller moving mechanism moves the attached roller as the transport driven roller is displaced upstream in the transport direction of the transported material. It is configured to increase the power.

  According to this aspect, when the conveyance driven roller is displaced to the upstream position in the conveyance direction of the recording material, the conveyance force becomes large and the state is suitable for the dedicated paper that requires high-precision conveyance. When the driven roller is displaced to the downstream position, the conveyance force becomes small, and a state suitable for plain paper in which head rubbing does not occur can be achieved.

  According to a ninth aspect of the present invention, in the conveyance roller device according to the eighth aspect, the biasing member is constituted by a torsion coil spring, and the torsion coil spring has one end as a fixed support end, The other end is provided in a cantilever state having a movable free end that is displaced integrally with the conveying driven roller.

  According to this aspect, the urging member is constituted by a torsion coil spring supported in a cantilever state, and the movable free end is thereby changed by a change in the leg angle between the fixed support end and the movable free end of the torsion coil spring. It becomes possible to cope with the displacement of. Therefore, the structure is simplified, and the urging position of the urging member is displaced following the displacement of the conveying driven roller to realize a conveying state with a stable nip pressure and conveying force necessary for conveying the recording material. Can do.

  According to a tenth aspect of the present invention, in the conveyance roller device according to any one of the sixth to ninth aspects, the roller moving mechanism holds the conveyance driven roller so as to freely rotate. A roller holding member, a rocking shaft that rockably holds the roller holding member, and a displacement mechanism that displaces the rocking shaft along the conveyance direction of the material to be conveyed. Is.

  According to this aspect, the configuration of the roller moving mechanism can be made relatively simple, and the driven roller for conveyance is displaced along the conveyance direction of the recording material in a state in which the roller holding member can be swung. It becomes possible.

  A recording apparatus according to an eleventh aspect of the present invention performs recording on a conveyance roller device that guides a fed recording material to a recording position, and a recording surface of the recording material guided to the recording position. A recording head; and a platen that supports and guides the lower surface of the recording material guided to the recording position, and the transport roller device according to any one of the first to tenth aspects. It is a roller device for conveyance.

  According to this aspect, in the recording apparatus such as an ink jet printer, the same operational effects as those of the conveying roller apparatus of each aspect can be obtained. In addition, since it is possible to realize a conveyance state in which the types of recording materials are matched, it is possible to perform recording with an image quality suitable for the types of recording materials.

  According to a twelfth aspect of the present invention, in the recording apparatus according to the eleventh aspect, the displacement mechanism, as a drive source, automatically sets a gap between the recording head and the recording material. The drive motor is used.

  According to this aspect, since the existing power mounted on the recording apparatus is used as the power of the displacement mechanism, the structural members can be effectively used in many ways, and the number of parts and the part cost can be reduced.

  According to a thirteenth aspect of the present invention, in the recording apparatus according to the twelfth aspect, the displacement mechanism includes a gear wheel train for the automatic gap setting mechanism that transmits power of the drive motor, and the gear wheel train. An intermediate gear and an operation rack that moves while meshing with the intermediate gear, the swing shaft being supported by the operation rack and being configured to move integrally with the operation rack. It is a feature.

  According to this aspect, by using the gear train and the intermediate gear in the existing automatic gap setting mechanism in addition to the drive motor as the constituent members of the displacement mechanism, it is possible to further effectively use the constituent members from various aspects. it can.

  Further, the displacement mechanism can be operated in conjunction with the operation of the automatic gap setting mechanism. For example, when a special paper is used as a recording material, the paper between the recording head and the special paper is used to improve the image quality. The operation of reducing the gap is performed, and in conjunction with this operation, the conveyance driven roller can be displaced to a position where the degree of “reverse warping” is small. Therefore, the conveyance load is reduced and high-precision feeding is possible, so that a higher recording image quality can be realized together. On the other hand, when using plain paper as the recording material, the gap between the recording head and the plain paper is increased by the above-mentioned interlocking, and the driven follower roller is displaced to a state where the degree of “reverse warping” is large. It is possible to reduce the possibility of head rubbing.

  Hereinafter, a conveying roller device according to the present invention and a recording apparatus including the conveying roller device will be described. First, an ink jet printer is taken up as the best mode for carrying out the recording apparatus of the present invention, and the outline of the entire configuration will be described with reference to the drawings. FIG. 1 is an enlarged perspective view showing a part of the internal structure of an ink jet printer to which the conveying roller device of the present invention is applied. FIG. 1 shows the internal structure of the carriage on the return position side.

  The ink jet printer 100 described here is a serial in which a carriage 5 on which a recording head 3 is mounted is guided by a carriage guide shaft 7 to reciprocate in a width direction B of a recording material P (hereinafter also referred to as a paper) that is a material to be conveyed. The printer is an ink jet printer including an automatic gap setting mechanism (hereinafter also referred to as an APG mechanism) 11 that automatically sets a gap PG between the recording head 3 and the paper P supported by the platen 9.

  The inkjet printer 100 includes a support frame 17 in which a back frame 13 and left and right side frames 15 and 15 are integrally formed in a U-shape in plan view. Between the left and right side frames 15, 15, the drive shaft 21 of the conveyance drive roller 19 in the conveyance roller device 1 of the present invention, which will be described later, can rotate about the axis, but in the conveyance direction A and width direction B of the paper P It is bridged in a fixed state that cannot be displaced.

  The left and right side frames 15 and 15 are formed with elongated holes 16 and 16 extending in the vertical direction. The above-described carriage guide shaft 7 is bridged between these long holes 16 and 16 so as to be displaceable in the vertical direction by the above-described APG mechanism 11. The APG mechanism 11 includes a drive motor 23, a gear wheel train 25 that transmits power of the drive motor 23, an intermediate gear 27 provided at the end of the gear wheel train 25, and a gap PG adjustment that meshes with the intermediate gear 27. And a displacement gear 29 for use.

  The APG mechanism 11 is provided in the outer space of the left and right side frames 15 and 15 in a state of interlocking with each other. However, the drive motor 23 is provided only on the illustrated return position side, and the drive motor 23 is not provided on the APG mechanism 11 on the home position side. The rear frame 13 is provided with a torsion coil spring 31 that is an example of an urging member in a later-described transport roller device 1 of the present invention in a cantilever state. A roller holding member 33 in the transport roller device 1 of the present invention, which will be described later, is provided in a lower front portion of the back frame 13 in a state of being swingably supported by a swing shaft 35.

  Further, at the free swing end of the roller holding member 33, a transport driven roller 37 that is in contact with the transport drive roller 19 is provided in a freely rotatable state. The transport driven roller 37 is pressed against the transport drive roller 19 with a predetermined nip pressure by receiving a biasing force from the torsion coil spring 31. Further, a recording position 39 for performing recording is provided downstream of the transport roller device 1 in the transport direction A of the paper P. The recording head 3 supported by the above-described carriage 5 is disposed above the recording position 39, and a platen that supports the lower surface of the paper P below the recording position 39 with a predetermined gap PG from the lower surface of the recording head 3. 9 is disposed.

[Example]
Next, the conveyance roller device 1 according to an embodiment of the present invention applied to the ink jet printer 100 configured as described above will be specifically described with reference to the drawings.
FIG. 2 is a side sectional view showing a conveying roller device when conveying plain paper, and FIG. 3 is a side sectional view showing the conveying roller device when conveying dedicated paper. 4 is a side view showing an operation mode of the displacement mechanism in the transport roller device when transporting the plain paper, and FIG. 5 is a side view showing an operation mode of the displacement mechanism in the transport roller device when transporting the dedicated paper. FIG.

  The transport roller device 1 of the present embodiment includes a transport drive roller 19 that imparts a transport force to the paper P, a transport driven roller 37 that is driven to rotate by being pressed against the transport drive roller 19, A torsion coil spring 31 as a biasing member that presses the transport driven roller 37 toward the transport drive roller 19 and the transport driven roller 37 along the transport direction of the paper P, that is, the transport direction A and the transport. A roller moving mechanism 41 that is displaced in the direction A and the reverse direction C is provided.

  The roller moving mechanism 41 includes a roller holding member 33 that holds the transport driven roller 37 in a freely rotatable state, and a swing shaft 35 that holds the roller holding member 33 in a swingable state. The rocking shaft 35 includes a displacement mechanism 43 that displaces the paper P in the conveyance direction A and the direction C opposite to the conveyance direction.

  The conveyance drive roller 19 is a single roller supported by the long drive shaft 21 spanned between the left and right side frames 15 and 15 as described above. The transport driving roller 19 is provided in a fixed state that cannot be displaced in the transport direction A and the width direction B of the paper P as described above. The transport driven roller 37 is a roller having a smaller diameter and a shorter length than the transport drive roller 19, and a plurality of the transport driven rollers 37 are provided in parallel in the width direction B of the paper P with an appropriate interval.

  At both left and right ends of the transport driven roller 37, shaft portions 45 and 45 having a smaller diameter and a shorter length than the transport driven roller 37 are provided, and are provided at the swing free ends of the roller holding member 33 described below. A plurality of bearing portions 47, 47 are supported in a freely rotatable state. A plurality of torsion coil springs 31 are provided at an appropriate interval in the width direction B of the paper P, and one end thereof is displaced integrally with the fixed support end 49 and the other end thereof with the transport driven roller 37. A movable free end 51 is formed. As described above, the torsion coil spring 31 is provided in a cantilever state, and the fixed support end 49 passes through the rear surface side of the back frame 13 and is locked in an appropriate position on the back frame 13 in a fixed state. ing.

  Further, the movable free end 51 extending downstream in the conveyance direction A of the paper P with the coil portion 53 interposed therebetween is locked to the upper surface of the bearing portion 47 of the roller holding member 33. The torsion coil spring 31 has a biasing force in the expanding direction. By this urging force, the bearing portion 47 of the roller holding member 33 locked to the movable free end 51 is pushed downward, and the conveyance driven roller 37 held by the roller holding member 33 is driven to carry. The roller 19 is urged to obtain a predetermined nip pressure necessary for transporting the paper P.

  As described above, the roller holding member 33 is a member that holds the conveyance driven roller 37 in a freely rotatable state, and further functions as a conveyance guide member that contacts the upper surface of the paper P and guides the conveyance of the paper P. It also has. The roller holding member 33 is a substantially rectangular flat plate member formed of a plastic molding material as an example long in the width direction B of the paper P. The roller holding members 33 are arranged in parallel in the width direction B of the paper P, and a plurality of roller holding members 33 having a size capable of holding four of the conveyance driven rollers 37 as an example. In FIG. 1, only three conveyance driven rollers 37 are shown, and one is not shown.

  At the position near the center of the upper surface of the roller holding member 33, the bearings of the rocking shaft 35 described above are arranged at a total of four locations (only three locations are shown in FIG. 1), for example, the left and right ends and two intermediate locations. A swinging fulcrum portion 55 that functions as: The swinging fulcrum 55 is fitted with a single long swinging shaft 35 that passes through the left and right side frames 15, 15 and extends outward from the side frames 15, 15. One swing shaft 35 is structured to hold all the plurality of roller holding members 33 in a suspended state.

  As shown in FIGS. 4 and 5, the displacement mechanism 43 is a mechanism that displaces the transport driven roller 37 to the upstream position A1 and the downstream position A2 in the transport direction A of the paper P. In this embodiment, the power of the drive motor 23 of the existing APG mechanism 11 is used as the power of the displacement mechanism 43 so as to effectively use the constituent members. Further, the displacement mechanism 43 uses the gear train 25 and the intermediate gear 27 of the APG mechanism 11 as they are as power transmission members for the displacement mechanism 43.

  The displacement mechanism 43 is provided with an operation rack 57 that meshes with the intermediate gear 27 that uses the intermediate gear 27 as a pinion. A holder portion 59 that holds both end portions of the swing shaft 35 is provided at the distal end portion of the operation rack 57.

  Next, the operation mode of the transport roller device 1 according to this embodiment configured as described above will be described separately for (1) when transporting plain paper and (2) when transporting dedicated paper. .

(1) When transporting plain paper (see Figs. 2 and 4)
The plain paper P1 is a low-rigidity sheet having no so-called “stiffness” in which a coating is not applied to the surface widely used as an output sheet for a copying machine, a laser printer, or the like. Since the plain paper P1 has a property that it swells and bends due to the impregnation of ink, in order to avoid head rubbing due to the deflection of the paper P, it is directed toward the recording position 39 in a posture called “reverse warp” described above. Sent out.

  When conveying such plain paper P1, the gap PG between the recording head 3 and the plain paper P1 is moved by rotating the drive motor 23 in a predetermined direction to move the carriage guide shaft 7 upward. Increase In this way, by increasing the gap PG, the risk of rubbing the head of the paper P described above is reduced. Further, in conjunction with the operation of the APG mechanism 11, the displacement mechanism 43 in the transport roller device 1 of this embodiment is also operated.

  That is, when the intermediate gear 27 rotates in a predetermined direction, the operation rack 57 is moved in the transport direction A of the paper P by a predetermined stroke. As the operation rack 57 moves, the swing shaft 35 held by the holder portion 59 of the operation rack 57 also moves in the same direction by the same stroke. As the swing shaft 35 moves, the roller holding member 33 and the transport driven roller 37 held by the roller holding member 33 are also displaced by the same stroke in the same direction.

  As shown in FIG. 2, the position of the transport driven roller 37 after the displacement is the downstream position A <b> 2, which is a position advanced in the transport direction A of the paper P from the transport drive roller 19. The plain paper P1 fed between the transport driving roller 19 and the transport driven roller 37 having such a positional relationship has a large entrance angle θ with respect to the platen 9 of θ = θmax, and is pressed against the upper surface of the platen 9. In this state, it is guided to the recording position 39. Therefore, coupled with the large gap PG, the risk of head rubbing of the paper P is greatly reduced.

  Further, the nip point N is moved by the displacement of the transport driven roller 37 to the downstream position A2, so that the nip pressure acting on the plain paper P1 is reduced and the transport force of the paper P is reduced. Further, since the movable free end 51 of the torsion coil spring 31 is also displaced to the downstream position A2 together with the conveying driven roller 37, the leg opening angle α between the fixed support end 49 of the torsion coil spring 31 and the movable free end 51 is large. Thus, the biasing force from the torsion coil spring 31 is also reduced.

(2) When transporting dedicated paper (see FIGS. 3 and 5)
The special paper P2 is an output paper dedicated to an ink jet printer having a so-called “stiffness” and having a high rigidity so that the surface can be subjected to high-precision recording. In the special paper P2, the deflection of the paper P due to the swelling of the ink does not appear remarkably, so the head rubbing does not matter so much, but execution of recording with high image quality is required, and the transport load of the paper P is required. There is a need for stable high feed accuracy by reducing resistance.

  When transporting such special paper P2, the carriage guide shaft 7 is moved downward by rotating the drive motor 23 in the opposite direction to that described above, and between the recording head 3 and the special paper P2. The gap PG is reduced. Even if the gap PG is reduced, in the case of the dedicated paper P2, there is no bending that causes head rubbing, and conversely, by reducing the gap PG, the recording density is increased and high-precision recording can be performed. Become. Further, in conjunction with the operation of the APG mechanism 11, the displacement mechanism 43 in the transport roller device 1 of this embodiment is also operated.

  That is, when the intermediate gear 27 rotates in the opposite direction, the operation rack 57 is moved by a predetermined stroke in the direction C opposite to the conveyance direction of the paper P. As the operation rack 57 moves, the swing shaft 35 held by the holder portion 59 of the operation rack 57 also moves in the same direction by the same stroke. As the swing shaft 35 moves, the roller holding member 33 and the transport driven roller 37 held by the roller holding member 33 are also displaced by the same stroke in the same direction.

  As shown in FIG. 3, the position of the transport driven roller 37 after the displacement is the upstream position A <b> 1, which is almost directly above the transport drive roller 19. In such a positional relationship, the “reverse warp” hardly occurs, and the dedicated paper P2 fed between the transport driving roller 19 and the transport driven roller 37 has an entrance angle θ with respect to the platen 9. Since θ = θmin, the path load for forcibly correcting the conveyance path of the dedicated paper P2 is not applied to the dedicated paper P2. Accordingly, in combination with the small gap PG, it contributes to the improvement of the conveyance accuracy of the paper P and the stabilization of the conveyance, and the high-quality and high-quality recording is executed.

  Further, since the nip point N is moved by the displacement of the transport driven roller 37 to the upstream position A1, the nip pressure acting on the dedicated paper P2 is increased and the transport force of the paper P is increased. Further, since the movable free end 51 of the torsion coil spring 31 is also displaced to the upstream position A1 together with the driven roller 37 for conveyance, the leg opening angle α between the fixed support end 49 of the torsion coil spring 31 and the movable free end 51 is small. Thus, the urging force from the torsion coil spring 31 also increases, so that the high-accuracy conveyance and high-precision recording can be performed.

[Other Example 1]
The conveying roller device 1 according to the present invention and the recording apparatus 100 provided with the conveying roller device 1 are basically configured as described above, but are within a range not departing from the gist of the present invention. It is of course possible to change or omit the general configuration.

  For example, the present invention is not limited to the configuration in which only the transport driven roller 37 is displaced, but the configuration in which only the transport drive roller 19 is displaced or the configuration in which both the transport drive roller 19 and the transport driven roller 37 are displaced. The roller moving mechanism 41 can be employed. In addition, the displacement mechanism 43 in the roller moving mechanism 41 may be a separate configuration including independent components in addition to a configuration using some of the components of the APG mechanism 11, and further, a displacement point. It is also possible to increase the displacement so as to be displaced in multiple stages.

  In addition, the roller moving mechanism 41 is configured to automatically displace one or both of the conveyance drive roller 19 and the conveyance driven roller 37 according to the type of the recording material P, and is also manually displaced. It is also possible to make it. Further, the urging member 31 is not limited to the torsion coil spring, and may be other spring members such as a tension coil spring, a compression coil spring, and a leaf spring, and the support structure of the urging member 31 is the follower for conveyance. Various configurations can be adopted as long as the configuration can displace the roller 37 and the conveyance drive roller 19.

  Further, the conveyance roller device 1 of the present invention is applicable not only to a serial printer but also to a line printer, and to other recording devices 100 other than an inkjet printer including the same conveyance roller device 1. Can also be applied.

[Other Example 2]
FIG. 6 is a perspective view showing an internal structure of an ink jet printer to which the conveyance roller device of another embodiment 2 is applied.
As shown in FIG. 6, the transport roller device 101 according to the second embodiment includes a roller holding member 133 and a transport driven roller 137 that is rotatably held by the roller holding member 133. Among these, the transport driven roller 137 includes a downstream driven roller 137a on the downstream side in the transport direction and an upstream driven roller 137b on the upstream side. The downstream driven roller 137a and the upstream driven roller 137b are arranged in parallel in two rows in the width direction B.

The state shown in FIG. 6 is a state in which the upstream driven roller 137 b is in contact with the transport drive roller 19. Further, the other members are the same as those in the above-described embodiment, so the same reference numerals are used and the description thereof is omitted.
Subsequently, the operation mode of the transport roller device 101 according to the second embodiment configured as described above is divided into (1) when transporting plain paper and (2) when transporting dedicated paper. explain.

(1) When transporting plain paper (see Fig. 7)
FIG. 7 is a side cross-sectional view showing a transport roller device when transporting plain paper in another embodiment 2.
As shown in FIG. 7, when the plain paper P <b> 1 is transported, the upstream driven roller 137 b is in contact with the transport drive roller 19. At this time, the center of the shaft of the upstream driven roller 137b is located downstream of the shaft center of the transport driving roller 19 in the transport direction. Accordingly, the reverse warp can be generated so as to press the plain paper P1 against the platen 9 as in the above-described embodiment.

  Further, the downstream driven roller 137a that is rotatably held by the roller holding member 133 is located on the downstream side of the upstream driven roller 137b. Further, the downstream driven roller 137a is positioned slightly below the position of the upstream driven roller 137b in the height direction. Therefore, the downstream driven roller 137a can contact the surface of the plain paper P1. That is, the downstream driven roller 137a can function as a so-called auxiliary roller.

As a result, the plain paper P1 can be pressed to the platen side, so that the so-called floating that the plain paper P1 is displaced to the recording head side can be prevented. That is, it is possible to more reliably prevent head rubbing where the plain paper P1 comes into contact with the head surface of the recording head 3.
Further, the plain paper P1 generally tends to cause so-called cockling that is deformed into a waveform when it is applied to ink. The downstream driven roller 137a can press the plain paper P1 toward the platen as described above. Therefore, the occurrence of cockling can be reduced.

(2) When transporting dedicated paper (see Fig. 8)
FIG. 8 is a side cross-sectional view showing a transport roller device at the time of dedicated paper transport in another embodiment 2.
As shown in FIG. 8, when transporting the dedicated paper P2, the displacement mechanism 43 and the roller moving mechanism 41 are operated to move the roller holding member 133 to the upstream side in the transport direction from the state of FIG. Then, the upstream driven roller 137 b is separated from the conveying drive roller 19, and the downstream driven roller 137 a is brought into contact with the conveying drive roller 19.

  The position of the downstream driven roller 137a at this time is the same as the position of the transport driven roller 37 when transporting the dedicated paper P2 in the above-described embodiment (see FIGS. 3 and 5). Therefore, “reverse warping” hardly occurs and the conveyance accuracy can be improved. Further, the nip pressure acting on the dedicated paper P2 increases, and the conveyance force of the paper P increases. Furthermore, since the urging force from the torsion coil spring 31 is increased, the highly accurate conveyance can be performed.

Here, the downstream driven roller 137a functioning as an auxiliary roller for transporting the plain paper P1 is retracted to the upstream side. Therefore, there is no possibility that the conveyance accuracy of the dedicated paper P2 is lowered. That is, there is no possibility that the urging force as the auxiliary roller acts on the dedicated paper P2, and there is no possibility that the frictional resistance due to being pressed against the platen 9 increases.
Further, the upstream driven roller 137b can smoothly guide the dedicated paper P2 to the nip point N1 between the downstream driven roller 137a and the conveyance drive roller 19. Specifically, since the upstream driven roller 137b is rotatably held, it is possible to reduce the frictional resistance caused by the relatively strong special paper P2 coming into contact with the lower surface of the roller holding member 133. .

  Furthermore, by providing the upstream driven roller 137b and the downstream driven roller 137a, when the dedicated paper P2 is conveyed, the distance that the roller holding member 133 moves upstream is longer than that in the above-described embodiment. can do. Therefore, the deformation amount of the torsion coil spring 31 can be increased. As a result, the urging force of the torsion coil spring 31 when transporting the dedicated paper P2 can be increased compared to the above-described embodiment. That is, it can be conveyed with higher accuracy.

  In the transport roller device 101 according to the second embodiment, the transport driven roller 137 includes a downstream driven roller 137a as a first driven roller provided on the downstream side in the transport direction, and an upstream in the transport direction from the downstream driven roller 137a. An upstream driven roller 137b as a second driven roller provided on the side, and the upstream side when transporting plain paper P1, which is an example of a first transported material that is relatively less elastic than the dedicated paper P2, When the driven roller 137b and the conveyance drive roller 19 cooperate to convey the plain paper P1, and convey the dedicated paper P2, which is an example of a second material to be conveyed that is relatively more elastic than the plain paper P1, the downstream side The driven roller 137a and the transport drive roller 19 cooperate to transport the dedicated paper P2.

In another embodiment 2, when the plain paper P1 having relatively weak elasticity is transported, the downstream driven roller 137a is in contact with the plain paper P1 on the downstream side in the transport direction from the upstream driven roller 137b. And
In the second embodiment, when the dedicated paper P2 having a relatively strong elasticity is conveyed, the upstream driven roller 137b is disposed upstream of the downstream driven roller 137a in the conveying direction, and the dedicated paper P2 is downstream of the downstream driven roller. Guide to a nip point N1 between the roller 137a and the conveying drive roller 19 is characterized.

The perspective view which shows the internal structure of the inkjet printer to which the roller apparatus for conveyance of a present Example is applied. FIG. 3 is a side sectional view showing a transport roller device when transporting plain paper of the printer. FIG. 3 is a side cross-sectional view illustrating a transport roller device when transporting dedicated paper of the printer. FIG. 3 is a side view showing an operation mode of a displacement mechanism when plain paper is conveyed by the printer. FIG. 3 is a side view showing an operation mode of a displacement mechanism during conveyance of dedicated paper of the printer. FIG. 6 is a perspective view showing an internal structure of an ink jet printer to which a transport roller device according to another embodiment 2 is applied. FIG. 10 is a side sectional view showing a conveyance roller device when conveying plain paper in another embodiment 2. FIG. 10 is a side cross-sectional view showing a conveyance roller device when conveying dedicated paper in another embodiment 2.

Explanation of symbols

1 roller device for conveyance, 3 recording head, 5 carriage, 7 carriage guide shaft,
9 Platen, 11 Automatic gap setting mechanism (APG mechanism), 13 Rear frame,
15 side frames, 16 oblong holes, 17 support frames, 19 transport drive rollers,
21 drive shaft, 23 drive motor, 25 gear train, 27 intermediate gear,
29 Displacement gear, 31 Torsion coil spring (biasing member), 33 Roller holding member,
35 oscillating shaft, 37 driven roller for conveyance, 39 recording position,
41 roller moving mechanism, 43 displacement mechanism, 45 shaft portion, 47 bearing portion,
49 fixed support end, 51 movable free end, 53 coil portion, 55 swing fulcrum portion,
57 rack for operation, 59 holder section, 100 inkjet printer (recording device),
101 (for other embodiment 2) conveying roller device, 133 roller holding member,
137 Conveyor driven roller, 137a downstream driven roller,
137b Upstream driven roller, A transport direction, B width direction, C direction opposite to transport direction,
P paper (recording material), P1 plain paper (recording material), P2 dedicated paper (recording material),
A1 (in the transport direction) upstream position, A2 (in the transport direction) downstream position, θ approach angle,
N nip point, N1 nip point, α leg angle, PG gap

Claims (13)

A driving roller for conveying that imparts a conveying force to the material to be conveyed;
A driven roller for conveyance that is driven and rotated by the driving roller for conveyance;
A biasing member that presses the transport driven roller toward the transport drive roller;
A roller apparatus for conveyance, comprising: a roller moving mechanism for relatively displacing the conveyance drive roller and the conveyance driven roller. In the conveyance roller device according to claim 1,
The roller movement mechanism is characterized in that the position of the relative displacement is set according to the type of material to be conveyed. In the conveyance roller device according to claim 2,
The conveyance driven roller includes a first driven roller provided on the downstream side in the conveyance direction;
A second driven roller provided on the upstream side in the transport direction from the first driven roller,
When transporting the first transported material, the second driven roller and the transport driving roller cooperate to transport the first transported material,
When the second material to be conveyed is stronger than the first material to be conveyed, the first driven roller and the conveyance driving roller cooperate to convey the second material to be conveyed. Roller device. In the roller device for conveyance according to claim 3,
When conveying a 1st material to be conveyed, the said 1st driven roller contacts the 1st material to be conveyed in the conveyance direction downstream from the said 2nd driven roller, The roller apparatus for conveyance characterized by the above-mentioned. In the roller device for conveyance according to claim 3 or 4,
When conveying the second material to be conveyed, the second driven roller has a nip point between the first driven roller and the conveyance driving roller on the upstream side in the conveyance direction from the first driven roller. A conveying roller device characterized by guiding to In the roller device for conveyance according to any one of claims 1 to 5,
The transport roller device, wherein the roller moving mechanism is configured to displace the transport driven roller along a transport direction of a material to be transported. In the conveyance roller device according to any one of claims 1 to 6,
The roller moving mechanism is configured such that an urging force transmitted from the urging member to the driven roller for conveyance is changed by the relative displacement of the conveying drive roller and the driven roller for conveyance. Conveyor roller device. In the roller device for conveyance according to claim 7,
The roller moving mechanism is configured to increase the urging force as the transport driven roller is displaced upstream in the transport direction of the transported material. In the roller device for conveyance according to claim 8,
The biasing member is constituted by a torsion coil spring,
The torsion coil spring is provided in a cantilever state in which one end is a fixed support end and the other end is a movable free end that is integrally displaced with the transport driven roller. In the roller device for conveyance according to any one of claims 6 to 9,
The roller moving mechanism is
A roller holding member that holds the driven roller for conveyance so as to freely rotate;
A swing shaft for swingably holding the roller holding member;
And a displacement mechanism for displacing the swing shaft along a conveyance direction of the material to be conveyed. A transport roller device for guiding the fed recording material to a recording position;
A recording head for performing recording on a recording surface of a recording material guided to the recording position;
A platen that supports and guides the lower surface of the recording material guided to the recording position,
11. The recording apparatus according to claim 1, wherein the conveying roller device is the conveying roller device according to any one of claims 1 to 10. The recording apparatus according to claim 11,
The displacement mechanism uses a drive motor of an automatic gap setting mechanism that automatically sets a gap between a recording head and a recording material as a drive source. The recording apparatus according to claim 12,
The displacement mechanism is
A gear train for the automatic gap setting mechanism for transmitting power of the drive motor;
An intermediate gear that forms the gear train;
An operation rack that moves in mesh with the intermediate gear,
A recording apparatus, wherein the swinging shaft is supported by the operation rack and is configured to move integrally with the operation rack.

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