JP2015063352A - Recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording device which can correspond more suitably to the difference of the thickness of recording sheets.SOLUTION: A printer 1 includes a recording head 3 for recording on a recording sheet P, a support member 10 which supports the recording sheet P, a gap adjustment means 20A for adjusting the gap between the recording head 3 and the support member, a conveying driving roller 6 for conveying the recording sheet P, and a conveying driven roller 7 which is energized toward the conveying driving roller 6. In addition, a roller position adjusting means 20B is provided which adjusts the gap between the conveying driving roller 6 and the conveying driven roller 7. The roller position adjusting means 20B adjusts, such that when the gap is wide, a first state is adopted in which the conveying driving roller 6 and the conveying driven roller 7 is separated, and when the gap is narrow, a second state is adopted in which the gap between the conveying driving roller 6 and the conveying driven roller 7 is in a positional relationship narrower than the first state.

Description

  The present invention relates to a recording apparatus represented by a facsimile, a printer, and the like.

  In a recording apparatus typified by a facsimile or a printer, a pair of transport rollers that precisely feeds a recording sheet fed from a sheet feeding unit that feeds a recording sheet as an example of a medium under a recording head, There are cases in which a driving roller that is rotationally driven by a driving source and a driven roller that is driven and rotated by niping (pressing) a recording sheet between the driving roller.

  Here, for example, when recording without margins on the recording paper, that is, when performing borderless recording, when the rear end of the recording paper comes out between the driving roller and the driven roller (nip position), the driving roller and the driven roller. The recording paper nip force causes a phenomenon that the recording paper is sent out vigorously in the paper conveyance direction (so-called “kicking phenomenon”), and the recording result may be disturbed when this kicking phenomenon occurs. .

  As a conventional technique for solving such a problem, for example, Patent Document 1 discloses a recording apparatus that is controlled so that the conveyance roller pair is separated when the recording medium passes through the conveyance roller pair.

JP 2005-335911 A

There are recording papers of various thicknesses, and when a thick recording paper is transported, the nip force in the transport roller pair becomes strong, and a roller mark may be formed on the recording surface.
The recording apparatus described in Patent Document 1 is only controlled so that the recording roller pair is separated when the recording medium passes through the conveying roller pair, and the above problem is not particularly taken into consideration.

  Accordingly, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a recording apparatus that can more appropriately cope with the difference in the thickness of the recording paper.

  In order to solve the above problems, a recording apparatus according to a first aspect of the present invention includes a recording head for recording on a recording medium, and a recording medium in a recording area in which recording is performed on the recording medium by the recording head. A recording medium support unit that supports the recording medium, a gap adjusting unit that adjusts a gap between the recording head and the recording medium support unit, a first roller that conveys the recording medium toward the recording area, A second roller urged toward the first roller; and a roller position adjusting unit that adjusts a position of the second roller with respect to the first roller. The roller position adjusting unit has a wide gap. Sometimes, when the first roller and the second roller are separated from each other, and when the gap is narrow, the distance between the first roller and the second roller is the first state. Also it is possible to adjust to assume a second state in which the narrow positional relationship, the gap adjusting means and the roller position adjusting means is characterized in that it is driven by the same motor.

According to this aspect, the roller position adjusting means for adjusting the position of the second roller when the recording medium is nipped by the first roller and the second roller includes the recording head and the recording medium support section. When the gap between the first roller and the second roller is wide, the first state where the first roller and the second roller are separated from each other, and when the gap is narrow, the distance between the first roller and the second roller is the first state. Therefore, the nip state of the recording medium between the first roller and the second roller can be appropriately set according to the thickness of the recording medium. It is possible to prevent or reduce the degree of roller marks on the recording surface.
In addition, since the roller position adjusting means is interlocked with the gap adjusting means, it is possible to more reliably prevent or reduce the degree of roller marks on the recording surface.

According to a second aspect of the present invention, in the first aspect, the roller position adjusting means has a plurality of adjustment values for the position of the second roller.
According to this aspect, since the roller position adjusting means has a plurality of adjustment values of the position of the second roller, roller marks are more appropriately formed on the recording surface by finely adjusting the position of the second roller. Can be prevented or reduced.

  According to a third aspect of the present invention, in the first or second aspect, the roller position adjusting unit is configured to perform recording on the recording medium. The position of the second roller is switched before and after leaving the space between the second roller and the second roller.

  According to this aspect, the roller position adjusting means performs the second operation before and after the rear end of the recording medium comes out from between the first roller and the second roller during recording on the recording medium. Since the position of the roller is switched, the above-described kicking phenomenon can be suppressed or prevented, and thereby good recording quality can be obtained.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the second roller is rotatably supported by a swingable roller support member, and the roller position adjusting means is A cam for pressing the moving member is provided.

  According to this aspect, the second roller is rotatably supported by the swingable roller support member, and the roller position adjusting means includes the cam that presses the swing member. The adjustment means can be obtained at low cost with a simple structure.

FIG. 3 is a side cross-sectional view illustrating a main part of the printer according to the invention. (A), (B), (C) is a figure which shows the change of the press state of the roller support member by a cam. The whole perspective view of a conveyance drive roller, a conveyance driven roller, and a drive mechanism. The perspective view of a drive mechanism. The front view of a gap adjustment means. The front view of a roller position adjustment means. The front view (1st gap state) of a compound gearwheel and its periphery structure. The front view (5th gap state) of compound gearwheel and its peripheral composition. The perspective view (5th gap state) of compound gear and its peripheral composition. The front view of a compound gear and its peripheral configuration (sixth gap state). The perspective view of a compound gear and its peripheral configuration (sixth gap state). The front view of a compound gear and its peripheral configuration (sixth gap state). The perspective view of a compound gear and its peripheral configuration (sixth gap state).

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings. However, the invention is not limited to the embodiment described below, and various modifications are possible within the scope of the invention described in the claims. Assuming that these are also included in the scope of the present invention, one embodiment of the present invention will be described below.

  FIG. 1 is a side sectional view showing a main part of an ink jet printer (hereinafter referred to as “printer”) 1 as an example of a recording apparatus according to the present invention, and FIGS. 2 (A), (B), and (C) are roller supports by a cam 16. FIG. 3 is a diagram showing a change in the pressing state of the member 8, FIG. 3 is an overall perspective view of the transport drive roller 6, the transport driven roller 7, and the drive mechanism 20, FIG. 4 is a perspective view of the drive mechanism 20, and FIG. FIG. 6 is a front view of the roller position adjusting means 20B.

  7 is a front view of the compound gear 26 and its peripheral configuration (first gap state), FIG. 8 is a front view of the compound gear 26 and its peripheral configuration (fifth gap state), and FIG. It is a perspective view (5th gap state) of a periphery structure. 10 is a front view of the compound gear 26 and its peripheral configuration (sixth gap state), FIG. 11 is a perspective view of the compound gear 26 and its peripheral configuration (sixth gap state), and FIG. 12 is the compound gear 26 and its periphery. FIG. 13 is a front view of the configuration (sixth gap state), and FIG. 13 is a perspective view (sixth gap state) of the compound gear 26 and its peripheral configuration.

  In the xyz orthogonal coordinate system shown in each drawing, the x direction and the y direction are horizontal directions, and the x direction is a direction (paper width direction) orthogonal to the paper transport direction. It is also the device width (left and right) direction. In addition, the y direction is a paper conveyance direction, and is also an apparatus depth direction of the printer 1. Furthermore, the z direction is the direction of gravity and is also the device height direction of the printer 1.

  In FIG. 1, a printer 1 as an example of a recording apparatus that records on a recording paper P as an example of a recording medium includes a conveyance driving roller 6 as a first roller, a conveyance driven roller 7 as a second roller, and a recording head. 3, a support member 10, a discharge driving roller 12, and a discharge driven roller 13.

The conveyance drive roller 6 is formed in a cylindrical shape from metal. Of the outer peripheral surface of the transport driving roller 6, the outer peripheral surface of the region in contact with the recording paper P to be transported is an abrasion resistant particle and a coating material that adheres and holds the wear resistant particle to the outer peripheral surface of the transport driving roller 6 The high friction layer formed by is provided. That is, the transport driving roller 6 is formed by attaching particles to the outer peripheral surface of the metal shaft.
The transport driving roller 6 is provided so that the rotation axis is along the x direction, and is rotated by a motor (not shown).

  The conveyance driven roller 7 is made of a thermoplastic resin such as POM (polyoxymethylene). That is, the transport driven roller 7 is made of a resin material. A plurality of the transport driven rollers 7 are provided along the rotation axis direction of the transport driving roller 6.

  The transport driven roller 7 is disposed on the upper side of the transport drive roller 6 and is biased toward the transport drive roller 6, and is displaced between a position in contact with the transport drive roller 6 and a position away from the transport drive roller 6. It is provided as possible. The conveyance driven roller 7 nips (pinch) the recording paper P with the conveyance driving roller 6, and the conveyance driving roller 6 is rotationally driven in the nipped state, whereby the recording paper P is conveyed downstream. .

  The recording head 3 is provided on the downstream side of the conveyance driving roller 6 and the conveyance driven roller 7, and a support member 10 as a recording medium support unit is provided below the recording head 3. That is, the recording paper P nipped by the transport driving roller 6 and the transport driven roller 7 is sent in the downstream direction along the transport path (recording region) between the recording head 3 and the support member 10.

  The recording head 3 performs ink jet recording on the recording paper P by ejecting ink onto the recording paper P supported by the support member 10. The recording head 3 is provided on a carriage 2 that can move in the main scanning direction (x direction). The carriage 2 receives power from a motor (not shown) while being guided by the guide shaft 4 in the main scanning direction. Reciprocates in the main scanning direction.

  The support member 10 is provided at a position facing the recording head 3 and maintains a gap (interval) between the recording paper P and the recording head 3 at a predetermined value. In FIG. 1, the symbol PG is a gap (interval) between the recording head 3 and the support member 10.

  A discharge driving roller 12 and a discharge driven roller 13 are provided downstream of the recording head 3 and the support member 10. The discharge drive roller 12 is made of an elastic material such as rubber. The discharge driving roller 12 is rotationally driven by a motor (not shown) and rotates to feed the recording paper P recorded by the recording head 3 to the downstream side and discharge it from the printer 1.

  The above is the general configuration of the printer 1. Hereinafter, the position of the conveyance driven roller 7 when the recording paper P is nipped by the gap adjusting unit 20 </ b> A for adjusting the gap PG and the conveyance driving roller 6 and the conveyance driven roller 7 is adjusted. The roller position adjusting means 20B to be described will be described.

  FIG. 3 shows the drive mechanism 20. The drive mechanism 20 includes a gap adjusting unit 20A (specifically, FIGS. 4 and 5) and a roller position adjusting unit 20B (specifically, FIG. 6). In FIG. 3, all the components of the gap adjusting unit 20A and the roller position adjusting unit 20B are not illustrated, but are partially omitted.

  Hereinafter, first, the gap adjusting means 20A will be described. The gap adjusting means 20A is a means for adjusting the gap PG by adjusting the height (position in the z direction) of the carriage guide shaft 4, and as shown in FIGS. A gap adjustment cam 29 provided on both sides) and a cam support shaft 30 that supports the gap adjustment cam 29 are provided.

  The gap adjusting cam 29 is formed integrally with the cam gear 28 and switches the contact state with the cam support shaft 30 as the cam gear 28 rotates. The cam gear 28 uses a motor 21 as a power source, and the motor 21 is controlled by a control unit 22. The control unit 22 controls the motor 21 based on driver information including information such as paper type and adjusts the gap PG.

  In the present embodiment, the gap adjusting cam 29 includes these six cam surfaces 29a, 29b, 29c, 29d, 29e, and 29f as shown in FIG. Each cam surface is formed to have a different distance from the rotation center C of the cam gear 28 (indicated by reference symbols a1 to a6). In this embodiment, the distance increases from the cam surface 29a to the cam surface 29f. It is formed as follows.

  The cam support shaft 30 supports each cam surface, thereby defining the gap PG. As the cam gear 28 rotates, the cam surface supported by the cam support shaft 30 is switched, so that the gap PG is switched. In the present embodiment, the gap PG is adjusted in six stages. The gap adjusting cam 29 and the cam support shaft 30 are provided at the shaft ends on both sides of the carriage guide shaft 4, but the rotational torque is transmitted to the gap adjusting cam 29 on one side in this embodiment. A gap adjusting cam 29 provided at the shaft end, that is, a gap adjusting cam 29 provided on the drive mechanism 20 side.

  Next, the roller position adjusting unit 20B will be described. The transport driven roller 7 already described is rotatably supported by a plurality of roller support members 8 provided along the x direction as shown in FIG. 3. In this embodiment, one roller support member 8 has 2 Two transport driven rollers 7 are supported.

  The roller support member 8 is provided so as to be rotatable (swingable) about a rotation shaft 9 extending in the x direction, and is conveyed by a coil spring 5 as an example of an urging means or a pressing means. The roller 7 is urged in a swinging direction (counterclockwise direction in FIG. 1) for urging the roller 7 toward the conveyance driving roller 6. The rotating shaft 9 is supported by the frame 11.

  The roller position adjusting means 20B includes a cam 16 that rotates about a shaft 17 that extends along the x direction, and the cam 16 presses the pressed surface 8a of the roller support member 8 downward. The roller support member 8 is rotated against the urging force of the coil spring 5. The rotation direction is a clockwise direction in FIG. 1, that is, a direction in which the transport driven roller 7 is separated from the transport driving roller 6. When the roller support member 8 swings by a predetermined angle or more, the conveyance driven roller 7 is separated from the conveyance driving roller 6 and the nip state of the recording paper P by the conveyance driving roller 6 and the conveyance driven roller 7 is released (FIG. 2 ( C)). That is, the roller position adjusting unit 20B is also a unit that adjusts the nip force when the sheet is nipped by the conveyance driven roller 7 and the conveyance driven roller 6. 2A is an example of the second state formed by the roller position adjusting means 20B, and FIG. 2C is an example of the first state.

  When the swing angle of the roller support member 8 is equal to or smaller than a predetermined angle, the recording paper P is held by the transport driving roller 6 and the transport driven roller 7 while maintaining the nip state of the recording paper P by the transport driving roller 6 and the transport driven roller 7. The nip force when niping P is adjusted. 2A and 2B both show a state in which the recording paper P is nipped by the transport driving roller 6 and the transport driven roller 7, but the nip force is as shown in FIG. 2B. It is smaller than the state shown in 2 (A).

  When the roller support member 8 is a complete rigid body, the transport driven roller 7 is separated from the transport drive roller 6 when the cam 16 pushes down the pressed surface 8 a of the roller support member 8 even a little. However, the roller support member 8 is made of, for example, a resin material and has a certain degree of elasticity. Accordingly, the roller support member 8 bends between the pressed surface 8a and the position where the coil spring 5 presses the roller support member 8, and the nip force is adjusted via this bend. In addition, the position where the coil spring 5 presses the roller support member 8 is an arrangement position of the conveyance driven roller 7 in the y direction and a position between the two conveyance driven rollers 7 in the x direction in this embodiment.

  The shaft 17 to which the cam 16 is attached uses the motor 21 as a power source, and the power of the motor 21 is transmitted to the shaft 17 via the drive mechanism 20 and rotates. That is, the nip state is adjusted by the rotation of the motor 21. In this embodiment, the adjustment of the nip state is used to mean both the release of the nip and the adjustment of the nip force.

Next, the drive mechanism 20 including the gap adjusting unit 20A and the roller position adjusting unit 20B will be further described.
The power of the motor 21 is transmitted to the composite gear 26 via the gear group 23, and the power is transmitted from the composite gear 26 to the gap adjusting means 20A and the roller position adjusting means 20B.

  The compound gear 26 is integrally provided with a first gear portion 26a, a second gear portion 26b, a restraining portion 26c, and a third gear portion 26d. Among these, the second gear portion 26b transmits power to the gap adjusting means 20A (cam gear 28) via the gear 32, and the third gear portion 26d is supplied to the roller position adjusting means 20B (shaft 17) via the gear 33. ). The gear 33 is attached to the shaft 17 as shown in FIG. 6, and the cam 16 is rotated by the rotation of the gear 33 to adjust the nip state. 7 to 13, the shaft 17 and the cam 16 are not shown.

  Here, in this embodiment, the driving mechanism 20 switches the state so as to displace the transport driven roller 7 upward as the gap PG is increased, thereby reducing the nip force. More specifically, as described above, in this embodiment, the gap PG is adjusted in six stages (first gap state to sixth gap state), but from the first gap state to the fifth gap state, the nip is adjusted. The force is the same, and the nip force is reduced in the sixth gap state. Note that reducing the nip force means that the nip force is zero, that is, includes a form of releasing the nip. Further, the small nip force is synonymous with a small load when the conveyance driven roller 7 comes into contact with the conveyance driving roller 6 in a state where there is no sheet between the conveyance driven roller 7 and the conveyance driving roller 6. Further, a large nip force is synonymous with a large load when the conveyance driven roller 7 comes into contact with the conveyance driving roller 6 in a state where there is no sheet between the conveyance driven roller 7 and the conveyance driving roller 6.

  That is, if the nip force between the transport driven roller 7 and the transport driving roller 6 before the recording paper P is nipped is reduced, the thick recording paper P is nipped between the transport driven roller 7 and the transport driving roller 6. In addition, the nip force is about the same as that of the thin recording paper P, and it is possible to suppress or prevent the thick recording paper P from being damaged. If the nip force is small when the gap PG is maximum compared to when the gap PG is minimum, the gap PG is maintained (not changed) when the gap PG is changed. May exist. For example, there may be gap PG switching in which the distance between the transport driving roller 6 and the transport driven roller 7 does not vary.

  This will be further described below. In FIG. 7, the outermost first gear portion 26 a in the compound gear 26 meshes with the gear group 23 (FIGS. 3 and 4) and receives the power of the motor 21. The second gear portion 26b, which is one step inside the first gear portion 26a, is not formed as a gear over the entire 360 ° circumference, and has a region in which teeth are not formed. 26c. The function of the restraining portion 26c will be described later. At least the region where the teeth are formed in the second gear portion 26b rotates the adjacent gear 32, that is, adjusts the gap.

  Similarly, the third gear portion 26d further inside the second gear 26b is not formed as a gear over the entire 360 ° circumference and has a region where teeth are not formed. The region where the teeth are formed in the third gear portion 26d rotates the adjacent gear 33, that is, adjusts the nip state.

  FIG. 7 shows the state of each gear when the gap PG is the smallest, that is, in the first gap state. When the motor 21 rotates to switch the gap PG in the direction of increasing the gap PG, the compound gear 26 rotates in the direction of the arrow (counterclockwise direction) in FIG.

  In the relationship between the second gear portion 26b and the gear 32, this rotational direction is a region direction in which the second gear portion 26b has teeth. Therefore, from the state of FIG. 7, the compound gear 26 moves in the arrow direction (counterclockwise direction). Is rotated, the gear 32 is rotated and the gap PG is sequentially switched. However, this rotational direction is the region direction in which the third gear portion 26d does not have teeth in the relationship between the third gear portion 26d and the gear 33, so that the compound gear 26 is moved in the direction of the arrow (counterclockwise from the state of FIG. Even if it rotates in the rotation direction), the gear 33 does not rotate and the nip state is not adjusted (the state shown in FIG. 2A is maintained).

  8 and 9 show a state when the gap PG is switched to the fifth gap state. Here, as shown in FIG. 9, the second gear portion 26b has a tooth portion 26b ′ having a small tooth width at the end position of the rotation direction in the gap expansion direction. The formation area of the restraining portion 26c has started. Further, the gear 32 is formed with a tooth portion 32a having a larger tooth width and a tooth portion 32b having a smaller tooth width, and in the region where the tooth portion 32 having a smaller tooth width is thereby formed, a missing tooth portion 32c is formed adjacent to each other. However, in the fifth gap state shown in FIGS. 8 and 9, the tooth part 26 b ′ and the tooth part 32 b having a small tooth width are not yet functioning.

  When the compound gear 26 further rotates from this state, the sixth gap state shown in FIGS. 10 and 11, that is, the state where the gap PG is the largest is obtained. In this state, in the gear 32, the arc-shaped restraining portion 26c of the compound gear 26 enters the missing tooth portion 32c adjacent to the tooth portion 32b having a small tooth width, and the gear 32 is restrained from rotating. . In other words, the gap PG is constrained so as not to change.

  When the compound gear 26 further rotates, as shown in FIGS. 12 and 13, the third gear portion 26d starts to mesh with the gear 33, the gear 33 rotates, that is, the cam 16 rotates, and the cam 16 Presses the pressed surface 8a of the roller support member 8 from above. Thereby, the nip state is adjusted.

  That is, in this embodiment, when the gap PG reaches the sixth gap state, the nip force can be reduced or the nip can be released as the compound gear 26 rotates.

  As described above, the printer 1 according to the present embodiment includes the gap adjusting unit 20A that adjusts the gap PG between the recording head 3 and the support member 10, and the recording area (the recording head 3 and the support member). A conveyance driving roller 6 as a first roller that conveys the recording paper P toward the area 10), a conveyance driven roller 7 as a second roller that is biased toward the conveyance driving roller 6, and It has. Moreover, the roller position adjustment means 20B which adjusts the position with respect to the conveyance drive roller 6 of the conveyance driven roller 7 is provided. When the gap PG is wide (for example, the sixth gap state), the roller position adjusting unit 20B is in a first state in which the transport driving roller 6 and the transport driven roller 7 are separated from each other, and when the gap PG is narrow (for example, the first gap state). It is possible to adjust so that the distance between the transport driving roller 6 and the transport driven roller 7 is in a narrower positional relationship than in the first state. The gap adjusting means 20A and the roller position adjusting means 20B are driven by the same motor 21.

Thereby, when the thickness of the recording paper P is increased, the distance between the transport driving roller 6 and the transport driven roller 7 is increased, that is, the nip force is adjusted so as not to be excessive. It is possible to prevent or reduce the degree of roller marks that are generated by pressing.
In addition, since the roller position adjusting means 20B is a mechanism that is linked to the gap adjustment by the gap adjusting means 20A, it is possible to more reliably prevent or reduce the degree of roller marks on the recording surface.

  In the present embodiment, since the gap adjusting means 20A and the roller position adjusting means 20B share the power source (motor 21), the cost of the apparatus can be reduced.

  In the present embodiment, the distance between the transport drive roller 6 and the transport driven roller 7 is the same from the first gap state to the fifth gap state, and when the sixth gap state is reached, the transport drive roller 6 and the transport driven roller. This is a configuration that widens the distance from 7. However, for example, the same gap may be used from the first gap state to the fourth gap state, and the gap may be increased in the fifth gap state. Alternatively, the unique interval can be set in each gap state. That is, the roller position adjusting means 20B can be configured to have a plurality of adjustment values for the interval (position of the transport driven roller 7). In this way, by finely adjusting the interval (position of the transport driven roller 7), it is possible to prevent or more appropriately reduce the formation of roller marks on the recording surface.

  When recording is performed without a margin at the trailing edge of the recording paper P, the discharge driving roller 12 and the discharging driven roller 13 are also detected after the trailing edge of the recording paper P is separated from between the conveyance driving roller 6 and the conveyance driven roller 7. Thus, recording is performed while the recording paper P is conveyed. Therefore, when a so-called kicking phenomenon occurs when the trailing edge of the recording paper P is separated from between the transport driving roller 6 and the transport driven roller 7, the recording quality is disturbed and deteriorated. For this reason, when the roller position adjusting unit 20 </ b> B is performing recording on the recording paper P, the position of the transport driven roller 7 is switched before and after the trailing edge of the paper comes out from between the transport driving roller 6 and the transport driven roller 7. You may do it.

  More specifically, for example, before the trailing edge of the sheet is removed from between the transport driving roller 6 and the transport driven roller 7, the interval between the transport driving roller 6 and the transport driven roller 7 is switched to a wide state, In the switched state, the rear end of the sheet is sent out between the transport driving roller 6 and the transport driven roller 7. Alternatively, the nip may be released before the trailing edge of the sheet comes out from between the transport driving roller 6 and the transport driven roller 7.

  As a result, when the trailing edge of the sheet comes out between the transport driving roller 6 and the transport driven roller 7, the above-described kicking phenomenon can be suppressed or prevented, and good recording quality can be obtained.

As mentioned above, it cannot be overemphasized that it is changeable suitably about each component demonstrated, without being limited to the content disclosed.
Further, in place of the roller position adjusting means 20B, a load adjusting means for adjusting the load when the conveyance driven roller 7 comes into contact with the conveyance driving roller 6 is adopted even if the distance between the conveyance driven roller 7 and the conveyance driving roller 6 does not change. You may do it. That is, the recording apparatus according to another aspect includes a gap adjusting unit 20A, a first roller (conveying drive roller 6 in the above embodiment) that conveys the sheet toward the recording area, and an urging toward the first roller. A second roller (conveying driven roller 7 in the above embodiment) and a load adjusting means for adjusting a load when the second roller comes into contact with the first roller, the load adjusting means including the gap The load is reduced along with the increase of. The load when the second roller is in contact with the first roller is a load in a state where no sheet exists between the second roller and the first roller.

According to such an aspect, even when the thickness of the paper is increased, the load when the paper is nipped by the first roller and the second roller is not excessive, and roller marks are prevented from being formed on the recording surface. Yes, or it can be reduced.
The load adjusting means reduces the load as the gap is enlarged, that is, the load adjusting means is interlocked with the gap adjusting means 20A, so that a roller mark is more reliably formed on the recording surface. Can be prevented or reduced.

DESCRIPTION OF SYMBOLS 1 Inkjet printer, 2 Carriage, 3 Recording head, 4 Carriage guide shaft, 5 Coil spring, 6 Conveyance drive roller, 7 Conveyance driven roller, 8 Roller support member, 8a Pressed surface, 9 Rotating shaft, 10 Support member, 11 Frame, 12 discharge drive roller, 13 discharge driven roller, 16 cams, 17 axes, 20 drive mechanism, 20A gap adjustment means, 20B roller position adjustment means, 21 motor, 22 control unit, 23 gear group, 26 compound gear, 26a first 1 gear portion, 26b second gear portion, 26c restraint portion, 26d third gear portion, 27 cam transmission gear, 28 cam gear, 29 gap adjustment cam, 29a to 29f cam surface, 30 cam support shaft, 31 shaft, 32 gear , 32a tooth, 32c tooth missing part, 33 gear, P recording paper,

Claims (4)

A recording head for recording on a recording medium;
A recording medium support unit that supports the recording medium in a recording area in which recording is performed on the recording medium by the recording head;
Gap adjusting means for adjusting a gap between the recording head and the recording medium support;
A first roller for conveying a recording medium toward the recording area;
A second roller biased toward the first roller;
Roller position adjusting means for adjusting the position of the second roller with respect to the first roller,
The roller position adjusting means is configured such that when the gap is wide, the first state where the first roller and the second roller are separated from each other, and when the gap is narrow, the distance between the first roller and the second roller is It is possible to adjust to take a second state that is in a narrower positional relationship than the first state,
The gap adjusting means and the roller position adjusting means are driven by the same motor.
A recording apparatus. The recording apparatus according to claim 1, wherein the roller position adjusting unit has a plurality of adjustment values of the position of the second roller.
A recording apparatus. 3. The recording apparatus according to claim 1, wherein the roller position adjusting unit is configured such that a rear end of the recording medium is between the first roller and the second roller during recording on the recording medium. Switching the position of the second roller before and after leaving
A recording apparatus. The recording apparatus according to any one of claims 1 to 3, wherein the second roller is rotatably supported by a swingable roller support member,
The roller position adjusting means includes a cam that presses the rocking member.
A recording apparatus.

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