JP2009179463A - Medium feed device, recording device, and separation state continuation control method of feed follower roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium feed device capable of preventing creep deformation owing to continuation of a state where a feed follower roller is separated from a feed drive roller. <P>SOLUTION: The medium feed device 30 is provided with a follower roller holder 33, for rotatably holding the feed follower roller 39, capable of moving the feed follower roller 39 to contact with or separate from the feed drive roller 38, an energizing means 36 for energizing the follower roller holder 33 in a direction that the feed follower roller 39 approaches the feed drive roller 38, separating direction displace means 31, 35 for displacing the follower roller holder 33 in a direction that the feed follower roller 39 separates from the feed drive roller 38 and a control part 40 for bringing the feed follower roller 39 being close to the feed drive roller 38 when it is judged that a separation continuation unnecessary condition (there is no need to continue a separation state) is satisfied. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention includes a feed drive roller that is driven by the power of a power source, a driven follower roller that is capable of feeding a medium to be fed in cooperation with the feed drive roller, and the feed follower roller is rotatable. And a driven roller holder capable of moving the driven follower roller toward and away from the feed drive roller, and urging the driven roller holder in a direction in which the feed driven roller approaches the feed drive roller. A medium feeding device comprising: a biasing means; and a separation direction displacing means for displacing the driven roller holder in a direction in which the feeding driven roller is separated from the feeding driving roller; a recording device comprising the medium feeding device; The present invention relates to a separated state continuing control method for driven rollers.
In the present application, the recording apparatus includes types such as an ink jet printer, a wire dot printer, a laser printer, a line printer, a copying machine, and a facsimile.

  Conventionally, as shown in Patent Document 1, the recording apparatus has been provided with a transport device for transporting paper as an example of a feeding device. And this conveyance apparatus had a conveyance roller pair. Specifically, a conveyance driving roller that is driven by the power of the motor and a conveyance driven roller that is driven to rotate in accordance with the conveyance driving roller. The transport driven roller is urged toward the transport drive roller by the urging means. Furthermore, a separation moving means for separating the conveyance driven roller from the conveyance driving roller against the urging force of the urging means is provided. Therefore, when a paper jam occurs in a state where the paper is nipped by the transport driving roller and the transport driven roller, the paper can be taken out without applying a load to each roller by using the separation moving means.

  Further, as disclosed in Patent Document 2, the recording apparatus is provided with a discharge unit that discharges paper as an example of a feeding device. The discharge unit has a discharge roller pair. Specifically, it has a discharge drive roller that is driven by the power of the motor and a discharge driven roller that is driven to rotate in accordance with the discharge drive roller. Further, the discharge driven roller is urged toward the discharge drive roller by the urging means. Furthermore, a separation moving means for moving the discharge driven roller away from the discharge driving roller against the urging force of the urging means is provided.

Therefore, it is not flexible like a recording sheet having a thickness of less than 1 mm, and a relatively thick recording medium such as a board, an information recording medium, and a printed board having a thickness of 3 mm can be conveyed. Specifically, the discharge driven roller is largely moved away from the discharge drive roller using the separation moving means. Then, the relatively thick recording medium is set. Thereby, the relatively thick recording medium can be easily set. Moreover, the load concerning the member which comprises a discharge part can be reduced.
JP 2002-128314 A JP 2002-192882 A

  However, if the state where the transport driven roller is separated from the transport drive roller and the state where the discharge driven roller is separated from the discharge drive roller are continued by the separation moving means although they are unnecessary, the biasing force Therefore, there is a risk that so-called creep deformation, which is plastic deformation, occurs in the members and the like constituting the separation moving means. Specifically, a spring as an example of the urging means is contracted, so that the urging force is increased and creep deformation may occur. In such a case, there is a possibility that postures of the transport driven roller and the discharge driven roller may change with respect to the width direction of the sheet. When the posture changes, the paper feed amount varies between the left and right in the width direction, which causes a skew.

  The present invention has been made in view of such a situation, and the problem is that a medium feeding device capable of preventing creep deformation due to the continued state where the feed driven roller is separated from the feed drive roller, It is to provide a recording apparatus provided with a medium feeding device and a control method in the medium feeding device.

  To achieve the above object, the medium feeding device according to the first aspect of the present invention is capable of feeding a medium to be fed in cooperation with a feed driving roller driven by the power of a power source and the feed driving roller. A driven driven roller that rotates in a driven manner, a driven roller holder that rotatably holds the fed driven roller, and that can move the feed driven roller in and out of contact with the feed drive roller, and the driven roller holder An urging means for urging the driven roller in a direction approaching the feed driving roller; a separation direction displacing means for displacing the driven roller holder in a direction in which the feed driven roller is separated from the feed driving roller; It is determined whether the driven roller does not need to continue to be separated from the feed driving roller, and it is determined whether or not the separated continuous unnecessary condition is satisfied. La is characterized in that it comprises a control unit to a state close to the said feed drive roller.

According to the first aspect of the present invention, the medium feeding device includes the control unit. Accordingly, it is possible to determine whether or not the separation-following unnecessary condition that does not need to continue the state where the feed driven roller is separated from the feed driving roller is satisfied. And when it determines with applicable, the said feed driven roller can be made into the state which approached the said feed drive roller. As a result, it is possible to prevent so-called creep deformation in which the driven roller holder and the feed driven roller are plastically deformed by the urging force of the urging means when left for a long time.
In the state where the feed driven roller is close to the feed drive roller, the biasing force of the biasing means acts on the driven roller holder and the feed driven roller. However, the feed driven roller and the feed drive roller The posture is determined with high accuracy by the contact. Therefore, there is almost no risk of creep deformation.

  That is, in this aspect, creep deformation due to an increase in the urging force in the separated state against the urging force of the urging means, and postures of the driven roller holder and the feed driven roller in the separated state It is possible to prevent creep deformation due to the instability. As a result, the posture of the feed driven roller due to the creep deformation can be prevented from changing with respect to the feed direction and the width direction of the fed medium. Then, it is possible to prevent the skew of the medium to be fed due to the change in the posture.

According to a second aspect of the present invention, in the first aspect, the discontinuation unnecessary condition is that the power of the medium feeding device is in an OFF state.
According to the second aspect of the present invention, in addition to the same effect as the first aspect, the separation continuation unnecessary condition is that the power of the medium feeding device is in an OFF state. Therefore, there is no possibility of being left for a long time in the separated state.

According to a third aspect of the present invention, in the first or second aspect, the separation continuation unnecessary condition is that the medium feeding device is in a power saving mode.
According to the third aspect of the present invention, in addition to the same effect as the first or second aspect, the separation continuation unnecessary condition is that the medium feeding device is in the power saving mode. Therefore, the creep deformation can be prevented more reliably.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the separation continuation unnecessary condition is a feed mode state in which the control unit sends a medium to be fed. The position of the feed driven roller that is separated from the feed drive roller and instructed by the controller is in a state of mismatch with the actual position of the feed driven roller that should correspond to the feed mode. It is characterized by.

  According to the fourth aspect of the present invention, in addition to the same effect as any one of the first to third aspects, the separation continuation unnecessary condition is a feed mode state in which the control unit sends the medium to be fed. However, the feed driven roller is separated from the feed drive roller, and the position of the feed driven roller instructed by the controller does not match the actual position of the feed driven roller that should correspond to the feed mode. It is a state of. Accordingly, the position of the feed driven roller can be aligned. That is, the position of the feed driven roller instructed by the control unit can be aligned with the actual position of the feed driven roller. This is effective when consistency is lost for some reason.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, there is provided a medium detector that detects the presence or absence of a medium to be fed between the feed driving roller and the feed driven roller. The control unit determines whether or not a medium to be fed exists between the feed driving roller and the feed driven roller, and when it is determined that the medium to be fed exists, the feed driven roller is A state of being separated from the driving roller is continued.
According to the fifth aspect of the present invention, in addition to the same effects as in any one of the first to fourth aspects, the presence / absence of a medium to be fed between the feed driving roller and the feed driven roller is determined. A medium detector for detecting, and the control unit determines whether or not a medium to be fed exists between the feed driving roller and the feed driven roller, and determines that there is a medium to be fed The feed driven roller continues to be separated from the feed drive roller. Therefore, there is no possibility that the user cannot take out the medium to be fed.
Here, when it is determined that there is a medium to be sent, the user may be notified of this by a warning display or a warning sound.

A recording apparatus according to a sixth aspect of the present invention includes a transport unit that transports a recording medium to the downstream side in the feeding direction, and a recording unit that performs recording on the recording medium transported from the transport unit. It is an apparatus, Comprising: The said conveyance part is provided with the said medium feeding apparatus in any one of the said 1st to 5th.
According to a sixth aspect of the present invention, the transport unit includes any one of the first to fifth medium feeding devices. Therefore, in the recording apparatus, it is possible to obtain the same function and effect as in any one of the first to fifth aspects.

In the seventh aspect of the present invention, the feed driven roller separated state continuation control method is a state in which the feed driven roller urged toward the feed drive roller via the driven roller holder is separated from the feed drive roller. A separation determination step for determining whether or not the separation state is satisfied, and it is determined whether or not a separation continuation unnecessary condition that does not require the feed driven roller to continue to be separated from the feed driving roller is determined. A separation continuation unnecessary condition determining step, and a feed driven roller approaching / moving step of moving the feed driven roller closer to the feed driving roller when it is determined to be applicable.
According to the 7th aspect of this invention, the effect similar to a 1st aspect can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of an ink jet printer (hereinafter referred to as “printer”) 1 as an example of a “recording apparatus” or “liquid ejecting apparatus” according to the present invention.
Here, the liquid ejecting apparatus refers to an ink jet recording apparatus, a copying machine, a facsimile, or the like that performs recording on a recording material by ejecting ink from a recording head as a liquid ejecting head to a recording material such as recording paper. In addition to the recording apparatus, instead of ink, a liquid corresponding to a specific application is ejected from the liquid ejecting head corresponding to the recording head to the ejected material corresponding to the recording material, and the liquid is ejected to the ejected material. Used to include the device to be attached.

  Further, as the liquid ejecting head, in addition to the recording head described above, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, an electrode material used for forming an electrode such as an organic EL display or a surface emitting display (FED). (Conductive paste) A jet head, a bio-organic matter jet head used for biochip manufacturing, a sample jet head for jetting a sample as a precision pipette, and the like.

The printer 1 is a large-sized printer capable of recording up to a recording medium having a relatively large width, such as a JIS standard A0 size or B0 size, or a roll paper P as a recording medium. And a main body unit 2 including a recording execution unit 4 and a paper discharge receiving unit 5.
The main body 2 is provided on an upper portion of a support column 8 erected on the base 9 and has a discharge port 6 for discharging the recorded roll paper P obliquely downward. An opening 7 of the stacker 10 is located below the discharge port 6, and the recorded roll paper P is discharged from the discharge port 6 toward the opening 7 and received by the stacker 10.

  The roll paper supply unit 3 is configured to store a roll paper roll (hereinafter referred to as “roll”) R, and the roll paper P is fed out from the roll R and supplied obliquely downward to the recording execution unit 4 that executes recording. Is done. Then, the roll R is set in a roll paper holder (not shown). When supplying roll paper, the roll paper holder is rotated by a spindle motor (not shown) as roll driving means, whereby the roll paper P is supplied downstream.

  The recording execution unit 4 ejects (injects) ink as liquid onto the roll paper P, and a recording head (not shown) as a liquid ejecting means or recording means, and a platen (not shown) arranged to face the recording head. 2), a conveyance driving roller 38 (conveying roller pair) (see FIG. 2) that conveys the roll paper P to the downstream side, and a conveyance driven roller 39 that is driven to rotate in pressure contact therewith, 39 (see FIG. 2).

The recording head is provided on a carriage (not shown). The carriage has a guide shaft (not shown) extending in the scanning direction (main scanning direction) of the recording head and a guide plate (not shown) extending in the main scanning direction. ), And moves in the main scanning direction by receiving the power of a motor (not shown).
An air suction unit (not shown) as a paper suction unit is provided on the downstream side of the recording head, and the roll paper P does not float on the downstream side of the recording head by the air suction unit (not shown). Therefore, the recording quality is prevented from being deteriorated due to the rising of the roll paper P.

FIG. 2 is a perspective view showing a transport unit according to the present invention.
As shown in FIG. 2, the transport unit 30 provided in the roll paper supply unit 3 is configured to transport the roll paper P to the recording execution unit 4. Specifically, the conveyance unit 30 includes a conveyance roller pair 37. The conveyance roller pair 37 includes a conveyance drive roller 38 that is driven by the power of the conveyance motor, and a plurality of conveyance driven rollers 39, 39, and the like that rotate following the rotation of the conveyance drive roller 38.

Among these, the conveyance driven rollers 39, 39... Are rotatably held by the driven roller holder 33. In this embodiment, the conveyance driven rollers 39, 39... Are held in the driven roller holder 33 as a set of three.
The driven roller holder 33 is provided with a pair of holder shafts 34, 34, and the pair of holder shafts 34, 34 are held by the base portion 32 so as to be swingable. Accordingly, the transport driven rollers 39, 39... Can move toward and away from the transport drive roller 38.

  Further, the driven roller holder 33 is urged by the torsion coil spring 36 in a direction in which the transport driven rollers 39, 39. Specifically, one end of the torsion coil spring 36 is engaged with the base portion 32, and the other end is engaged with the side of the driven roller holder 33 that holds the transport driven rollers 39, 39. is doing.

And the cam follower part 35 which the cam part 31 (refer FIG. 3 (A) (B)) is on the opposite side to the side holding the conveyance driven rollers 39, 39 ... from the holder shafts 34, 34 in the driven roller holder 33. (See FIGS. 3A and 3B). Therefore, the cam portion 31 can move the transport driven rollers 39, 39... Away from the transport drive roller 38 against the urging force of the torsion coil spring 36.
In this embodiment, it is assumed that a plurality of driven roller holders 33 for holding the transport driven rollers 39, 39... In a set are provided in the width direction of the roll paper P. In the following description, the plurality of driven roller holders 33, 33... Perform the same operation.

FIGS. 3A and 3B are side views showing an outline of the transport section according to the present invention. Among these, FIG. 3A shows a nip state of the pair of conveying rollers. On the other hand, FIG. 3B shows the release state of the conveying roller pair.
As shown in FIG. 3A, when the conveying roller pairs 37, 37... Are in the nip state, the control unit 40 separates the cam portions 31, 31 from the cam follower portions 35, 35. Therefore, the driven roller holders 33, 33... Swing in the direction in which the transport driven rollers 39, 39. As a result, the transport driven rollers 39, 39... In the nip state, the roll paper P can be held and conveyed.
A paper detector 41 that detects the presence or absence of the roll paper P is provided in the vicinity of the conveyance roller pair 37.

  As shown in FIG. 3 (B), when the conveying roller pairs 37, 37... Are in the release state, the control unit 40 causes the cam units 31, 31. .. Are engaged with the cam follower portions 35, 35... And the posture of the driven roller holders 33, 33. Specifically, the transport driven rollers 39, 39... Are swung in a direction away from the transport drive roller 38. As a result, the transport driven rollers 39, 39... Are separated from the transport drive roller 38 and are in a release state. In the release state, the user can set the roll paper P.

Further, when executing a relatively large skew removal of the roll paper P after setting, it is possible to effectively perform a relatively large skew removal by temporarily switching to the release state.
However, in the release state, the conveyance driven rollers 39 are separated from each other against the urging force of the torsion coil springs 36. In other words, the biasing force acts in a relatively unstable posture on the side of the driven roller holders 33, 33... Holding the conveying driven rollers 39, 39.

Further, since the torsion coil springs 36, 36... Are contracted compared to the nip state, the biasing force is large compared to the nip state. Therefore, the so-called creep stress to be deformed acts on the side of the driven roller holders 33, 33... Holding the conveying driven rollers 39, 39. When left in the release state for a long time, the driven roller holders 33, 33... And the transport driven rollers 39, 39.
Therefore, in the present embodiment, the control described below is executed.

FIG. 4 is a chart showing the control of the transport unit according to the present invention.
As shown in FIG. 4, in step 11 (hereinafter referred to as S11), it is determined whether or not the transport roller pairs 37, 37,. Specifically, the control unit 40 can determine whether the release state is established by detecting the positions of the cam units 31, 31. And if it is a release state, it will progress to S12. On the other hand, if the state is not the release state, that is, the nip state, the sequence is terminated.

  In S12, it is determined whether or not the printer 1 is turned off. Specifically, the control unit 40 determines whether or not the power source has been switched to the OFF state or whether or not the power source is in the OFF state. If it is determined that the power has been switched off or the power is off, the process proceeds to S13. On the other hand, if it is determined that the switch has not been switched to the OFF state, that is, it remains in the ON state, the sequence is terminated.

In S13, the conveying roller pairs 37, 37,. Specifically, the control unit 40 separates the cam units 31, 31... From the cam follower units 35, 35. Then, the transport driven rollers 39, 39... Are moved closer to the transport drive roller 38 to be in the nip state. Then, the sequence ends.
Therefore, even if the power supply is turned off, there is no possibility of being left for a long time in the release state. As a result, the creep deformation of the driven roller holders 33, 33... And the transport driven rollers 39, 39.

[Other embodiment 1]
FIG. 5 is a chart showing the control of the transport unit according to another embodiment 1.
Here, since the structural members are the same as those described above, the same reference numerals are used and the description thereof is omitted.
As shown in FIG. 5, in S21, it is determined whether or not the transport roller pairs 37, 37,. Specifically, the control unit 40 can determine whether the release state is established by detecting the positions of the cam units 31, 31. And if it is a release state, it will progress to S22. On the other hand, if the state is not the release state, that is, the nip state, the sequence is terminated.

In S22, it is determined whether or not the printer 1 has shifted to the power saving mode. Specifically, the control unit 40 determines whether or not the mode has been switched to the power saving mode.
Here, the “power saving mode” refers to a mode in which less power is supplied compared to the normal power supply state in order to reduce the power consumed by the printer 1. This is a so-called sleep state that switches when no operation continues in the power-on state.
And when it determines with having switched to the power saving mode, it progresses to S23. On the other hand, if it is determined that the mode has not been switched to the power saving mode, the sequence is terminated.

In S23, the conveyance roller pairs 37, 37. Specifically, the control unit 40 separates the cam units 31, 31... From the cam follower units 35, 35. Then, the transport driven rollers 39, 39... Are moved closer to the transport drive roller 38 to be in the nip state. Then, the sequence ends.
Therefore, even when the printer 1 shifts to the power saving mode, there is no possibility that the printer 1 is left for a long time in the release state. As a result, the creep deformation of the driven roller holders 33, 33... And the transport driven rollers 39, 39.

[Other embodiment 2]
FIG. 6 is a chart showing control of the transport unit according to another embodiment 2.
As shown in FIG. 6, in S31, it is determined whether the transport roller pairs 37, 37,. Specifically, the control unit 40 can determine whether the release state is established by detecting the positions of the cam units 31, 31. And if it is a release state, it will progress to S32. On the other hand, if the state is not the release state, that is, the nip state, the sequence is terminated.

  In S32, it is determined whether or not the paper detector 41 (see FIG. 3) has detected paper. Specifically, the control unit 40 determines whether or not a “no paper” signal is received from a paper detector 41 (see FIG. 3) provided in the vicinity of the pair of conveyance rollers 37, 37. If it is determined that “no paper”, the process proceeds to S33. On the other hand, when it is determined that “paper is not present”, that is, “paper is present”, the sequence is terminated.

  In S33, it is determined whether or not the printer 1 is turned off. Specifically, the control unit 40 determines whether or not the power source has been switched to the OFF state or whether or not the power source is in the OFF state. If it is determined that the power has been switched off or the power is off, the process proceeds to S34. On the other hand, if it is determined that the switch has not been switched to the OFF state, that is, it remains in the ON state, the sequence is terminated.

In S34, the conveying roller pairs 37, 37. Specifically, the control unit 40 separates the cam units 31, 31... From the cam follower units 35, 35. Then, the transport driven rollers 39, 39... Are moved closer to the transport drive roller 38 to be in the nip state. Then, the sequence ends.
Accordingly, when it is determined that “paper is present”, the release state is maintained. As a result, the user can take out the roll paper P at any time.
Moreover, even when the power is turned off, there is no risk of leaving it in a release state for a long time. As a result, the creep deformation of the driven roller holders 33, 33... And the transport driven rollers 39, 39.

[Other embodiment 3]
FIG. 7 is a chart showing control of the transport unit according to another embodiment 3.
As shown in FIG. 7, in S41, it is determined whether or not the transport roller pairs 37, 37,. Specifically, the control unit 40 can determine whether the release state is established by detecting the positions of the cam units 31, 31. And if it is a release state, it will progress to S42. On the other hand, if the state is not the release state, that is, the nip state, the sequence is terminated.

  In S42, it is determined whether or not the paper detector 41 (see FIG. 3) has detected paper. Specifically, the control unit 40 determines whether or not a “no paper” signal is received from a paper detector 41 (see FIG. 3) provided in the vicinity of the pair of conveyance rollers 37, 37. If it is determined that “no paper”, the process proceeds to S43. On the other hand, when it is determined that “paper is not present”, that is, “paper is present”, the sequence is terminated.

In S43, it is determined whether or not the printer 1 has shifted to the power saving mode. Specifically, the control unit 40 determines whether or not the mode has been switched to the power saving mode.
And when it determines with having switched to the power saving mode, it progresses to S44. On the other hand, if it is determined that the mode has not been switched to the power saving mode, the sequence is terminated.
In S44, the conveyance roller pairs 37, 37. Specifically, the control unit 40 separates the cam units 31, 31... From the cam follower units 35, 35. Then, the transport driven rollers 39, 39... Are moved closer to the transport drive roller 38 to be in the nip state. Then, the sequence ends.

Accordingly, when it is determined that “paper is present”, the release state is maintained. As a result, the user can take out the roll paper P at any time.
Further, even when the printer 1 shifts to the power saving mode, there is no possibility that the printer 1 is left for a long time in the release state. As a result, the creep deformation of the driven roller holders 33, 33... And the transport driven rollers 39, 39.

If the position of the transport driven rollers 39, 39... Instructed by the control unit 40 is different from the actual position of the transport driven rollers 39, 39. Specifically, the control unit 40 is in a feed mode state in which the roll paper P is sent, but the transport driven rollers 39, 39... Are separated from the transport drive roller 38. The positions of the transport driven rollers 39, 39... Instructed by the control unit 40 are inconsistent with the actual positions of the transport driven rollers 39, 39.
Here, the actual position of the transport driven rollers 39, 39... Can be recognized by providing a sensor in the vicinity of the driven roller holders 33, 33... And detecting the posture of the driven roller holders 33, 33. .

  The conveyance unit 30 of the roll paper supply unit 3 that is an example of the medium feeding device of the present embodiment is a conveyance drive that is an example of a feed drive roller that is driven by the power of a conveyance motor (not shown) that is an example of a power source. The roller 38, the conveyance driven rollers 39, 39,..., Which are examples of driven rotation rollers which can be driven to rotate and can feed the roll paper P, which is an example of the medium to be fed, in cooperation with the conveyance driving roller 38. The rollers 39, 39... Are rotatably held, and the driven roller holders 33, 33... And the driven roller holders 33, 33. The torsion coil springs 36, 36, and the driven roller holders 33, 33, which are examples of biasing means for biasing the transport driven rollers 39, 39 in the direction approaching the transport drive roller 38, .., And cam follower portions 35, 35..., Which are examples of separation direction displacing means that displace the rollers 39, 39. It is determined whether or not it is necessary to maintain the separated state where it is not necessary to continue the state of being separated from the driving roller 38, and when it is determined that it is true, the conveyance driven rollers 39, 39. And a control unit 40.

In the present embodiment, the discontinuation unnecessary condition is that the power of the inkjet printer 1 is in an OFF state.
In the present embodiment, the separation continuation unnecessary condition is that the inkjet printer 1 is in a power saving mode.
Furthermore, in the present embodiment, the separation continuation unnecessary condition is a feed mode state in which the control unit 40 sends the roll paper P, but the conveyance driven rollers 39, 39. The positions of the transport driven rollers 39, 39... Instructed by the section 40 are inconsistent with the actual positions of the transport driven rollers 39, 39.

In this embodiment, it has a paper detector 41 as a medium detector that detects the presence or absence of the roll paper P between the transport driving roller 38 and the transport driven rollers 39, 39... It is determined whether or not the roll paper P exists between the roller 38 and the transport driven rollers 39, 39... (S32, S42), and when it is determined that the roll paper P exists, the transport driven rollers 39, 39. Is continued from the conveyance drive roller 38.
The ink jet printer 1 which is an example of the recording apparatus of the present embodiment records on the roll paper P which is transported from the transport unit 30 and the transport unit 30 which transports the roll paper P which is an example of a recording medium to the downstream side in the feed direction. And an ink jet printer 1 having a recording execution unit 4 as a recording unit for executing the above-described recording apparatus, wherein the transport unit 30 includes the medium feeding device.

  The separation state continuation control method of the conveyance driven rollers 39, 39... According to the present embodiment is the conveyance driven rollers 39, 39 urged toward the conveyance drive rollers 39, 39. Is a separation determination step (S11, S21, S31, S41) for determining whether or not they are separated from the conveyance drive roller 38, and the conveyance driven rollers 39, 39. 38, a separation continuation unnecessary condition determination step (S12, S22, S32, S42) for determining whether or not a separation continuation unnecessary condition that does not need to continue the state separated from 38 is satisfied. Including a transport driven roller approaching movement step (S13, S23, S34, S44) for moving 39, 39. And butterflies.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

1 is an external perspective view of a printer according to the present invention. The perspective view which shows the conveyance part which concerns on this invention. (A) (B) is a side view which shows the outline of the conveyance part which concerns on this invention. The chart figure which shows control of the conveyance part which concerns on this invention. FIG. 9 is a chart showing control of a transport unit according to another embodiment 1. FIG. 9 is a chart showing control of a transport unit according to another embodiment 2. FIG. 9 is a chart showing control of a conveyance unit according to another embodiment 3.

Explanation of symbols

1 inkjet printer, 2 main body, 3 roll paper supply unit, 4 recording execution unit,
5 Discharge receiving portion, 6 (roll paper) discharge port, 7 opening, 8 struts, 9 base,
10 (roll paper) stacker, 30 transport section, 31 cam section, 32 base section,
33 driven roller holder, 34 holder shaft, 35 cam follower,
36 torsion coil springs, 37 transport roller pairs, 38 transport drive rollers,
39 Conveyance driven roller, 40 control unit, 41 paper detector, P roll paper, R roll

Claims (7)

A feed drive roller driven by the power of the power source;
A driven driven roller that rotates in a driven manner capable of feeding a medium to be fed in cooperation with the feed driving roller;
A driven roller holder that rotatably holds the feed driven roller, and is capable of moving the feed driven roller toward and away from the feed drive roller;
Biasing means for biasing the driven roller holder in a direction in which the feed driven roller approaches the feed drive roller;
A separation direction displacing means for displacing the driven roller holder in a direction in which the feed driven roller is separated from the feed drive roller;
It is determined whether or not the feed driven roller satisfies a separation continuation unnecessary condition where it is not necessary to continue the separated state from the feed drive roller,
And a control unit configured to bring the feed driven roller closer to the feed driving roller when it is determined to be applicable.   The medium feeding apparatus according to claim 1, wherein the separation continuation unnecessary condition is that the power of the medium feeding apparatus is in an OFF state.   3. The medium feeding device according to claim 1, wherein the separation continuation unnecessary condition is that the medium feeding device is in a power saving mode state. 4.   4. The medium feeding device according to claim 1, wherein the separation continuation unnecessary condition is a feeding mode state in which the control unit feeds a medium to be fed, but the feeding driven roller is the feeding driving roller. 5. And a position of the feed driven roller instructed by the control unit is inconsistent with an actual position of the feed driven roller that should correspond to the feed mode. In the medium feeding device according to any one of claims 1 to 4,
A medium detector for detecting presence or absence of a medium to be fed between the feed driving roller and the feed driven roller;
The controller is
Determining whether a medium to be fed exists between the feed drive roller and the feed driven roller;
A medium feeding device that continues the state in which the feeding driven roller is separated from the feeding driving roller when it is determined that a medium to be fed exists. A transport unit for transporting the recording medium downstream in the feed direction;
A recording unit comprising: a recording unit that performs recording on a recording medium conveyed from the conveying unit;
The recording apparatus including the medium feeding device according to any one of claims 1 to 5, wherein the transport unit is provided. A separation determination step for determining whether or not the feed driven roller biased through the driven roller holder toward the feed drive roller is in a state of being separated from the feed drive roller;
A separation continuation unnecessary condition determination step for determining whether or not the separation of the feed driven roller does not need to continue the state of being separated from the feed driving roller when it is determined that the separated state is satisfied;
A feed driven roller separation state continuation control method comprising: a feed driven roller approach moving step of moving the feed driven roller closer to the feed drive roller when it is determined to be applicable.

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