JP2011006173A - Medium reversing device and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medium reversing device in consideration of downsizing of the device.SOLUTION: The medium reversing device (61) includes a roller (62). The roller rotates in one direction thereby to wind a conveyed medium (P) conveyed from an upstream side in a conveyance direction, from a front end side as a downstream side (Y) in the conveyance direction of the conveyed medium (P), and rotates in the reverse direction to the one direction thereby to unwind the wound conveyed medium (P). The roller conveys the conveyed medium (P) toward the downstream side (Y) in the conveyance direction with the rear end of the wound conveyed medium set at the front.

Description

The present invention relates to a medium reversing device for reversing the front and back of a medium to be fed and a recording apparatus including the medium reversing device.
In the present application, the recording apparatus includes an inkjet printer, a wire dot printer,
Include types such as laser printers, line printers, copiers, and facsimiles.

Conventionally, as shown in Patent Document 1, a recording apparatus includes a sheet reversing unit as a medium reversing apparatus that reverses the front and back of a sheet, which is an example of a medium to be fed. The sheet reversing unit of the first form in the prior art has a sheet feeding path divided into two forks. Then, the paper is fed from one of the two forks to the junction of the two forks, and the paper is stopped at the position where the paper has passed the junction. Thereafter, the paper traveling direction was reversed and the paper was sent to the merging point side and sent to the other of the two branches. As a result, the front and back of the paper can be reversed on the other side of the bifurcated state with respect to the state of the paper located on the one side of the bifurcated side. This is a so-called inversion method by switchback.

Further, the sheet reversing unit according to the second aspect of the prior art has a substantially circular feeding path when viewed from the side, and the sheet enters from one end side of the feeding path and is turned over. Then, by retreating the sheet from the other end side, the front and back of the sheet could be reversed. This is a so-called reverse method using a U-shaped path.

However, in the sheet reversing unit according to the first aspect of the prior art, it is necessary to extend the bifurcated feeding path by at least the length of the sheet from the joining point. This hinders downsizing the sheet reversing unit.
In the paper reversing unit according to the second aspect of the prior art, it is necessary to extend a substantially circular feeding path in side view at least as long as the length of the paper. This hinders downsizing the sheet reversing unit.

The present invention has been made in view of such a situation, and an object thereof is to provide a medium reversing device in consideration of downsizing of the device and a recording apparatus including the medium reversing device.

In order to achieve the above object, the medium reversing device according to the first aspect of the present invention is the downstream of the fed medium in the feeding direction by rotating the fed medium sent from the upstream side in the feeding direction in one direction. Wrapping from the leading end side, which is the side, and rotating in the direction opposite to the one direction, the wound medium to be wound is unwound, and the trailing end when the medium is wound is sent to the downstream in the feeding direction. It is provided with a roller.

According to the first aspect of the present invention, the roller can be wound around the roller from the leading end side of the medium to be fed by rotating in the one direction. Then, by rotating in the reverse direction, the wound medium to be fed can be unwound from the rear end side. At this time, the rear end can be sent to the downstream side in the feed direction. As a result, the front and back of the medium to be fed can be reversed.

Here, the roller can be provided relatively small. In other words, the diameter of the roller can be reduced regardless of the length of the medium to be fed.
As a result, the medium inversion device can be reduced in size as compared with the conventional so-called inversion method by switchback and the inversion method by the U-shaped path. That is, since a relatively long path required for switchback or a U-shaped path is not required, the size can be reduced accordingly.

The medium reversing device according to the second aspect of the present invention includes a roller that winds a medium to be fed that has been fed from the upstream side in the feeding direction from the tip side that is the downstream side in the feeding direction of the medium to be fed, and the roller that is wound around the roller. And feeding means for unwinding the medium to be fed from the roller while feeding the medium to the downstream side in the feeding direction starting from the rear end of the medium to be fed.
According to the second aspect of the present invention, the medium to be fed can be wound around the roller.
Then, the feeding means unwinds the feeding medium wound around the roller and feeds it to the downstream side in the feeding direction, so that the front and back of the feeding medium can be reversed.
As a result, the same effect as the first aspect can be obtained.

According to a third aspect of the present invention, in the first or second aspect, the roller is provided on a rotating body and is configured to rotate about a point different from the rotating fulcrum of the rotating body. To do.
According to the 3rd aspect of this invention, in addition to the effect similar to the 1st or 2nd aspect, the rear-end side of a to-be-delivered medium can be wound around the said rotary body. Therefore, the winding to the trailing end of the medium to be fed can be completed at an earlier timing than in the case where the winding is performed only on the roller.

Moreover, compared with the case where it winds around only the said roller, the curl of a to-be-delivered medium can be loosened.
Furthermore, a medium to be fed that is longer than the outer periphery of the roller can be wound without being overlapped. For example, when a medium immediately after recording with ink or the like is wound, the front and back of the medium to be fed can be reversed without contacting the semi-dry ink anywhere.

According to a fourth aspect of the present invention, in the third aspect, a sun gear provided at a rotation fulcrum of the rotating body and fixed to a medium reversing device, and a planet provided at the roller and meshing with the sun gear. And a gear.
According to the 4th aspect of this invention, in addition to the effect similar to a 3rd aspect, the said sun gear,
Since it has the planetary gear, the roller can also be rotated by rotating the rotating body. That is, a power transmission mechanism to the roller can be configured with a simple configuration.

According to a fifth aspect of the present invention, in the fourth aspect, on the outer periphery of the sun gear,
A toothless portion is provided, and when the medium to be fed is unwound from the roller, the planetary gear provided on the roller is configured to face the toothless portion.
According to the 5th aspect of this invention, in addition to the effect similar to a 4th aspect, when unwinding a to-be-delivered medium from the said roller, the said roller can be made into a rotatable state. As a result, when the feeding unit is provided, the medium to be fed can be easily unwound from the roller and fed to the downstream side in the feeding direction. That is, there is no possibility that the configuration of the sun gear and the planetary gear hinders the operation of the feeding means.
Further, even if the feeding means is not provided, the roller can be made to be rotatable, and therefore, by providing a power transmission means different from the sun gear, the roller is rotated in the reverse direction. The delivered medium can be solved.

A recording apparatus according to a sixth aspect of the present invention is a recording apparatus that includes a recording unit that records on a recording medium, and an inversion unit that inverts the front and back of the recording medium. The medium inversion device according to any one of the first to fifth aspects is provided.
According to a sixth aspect of the present invention, the reversing unit includes the medium reversing device according to any one of the first to fifth aspects. Therefore, the recording apparatus can obtain the same operational effects as in any one of the first to fifth aspects.

1 is a schematic side view illustrating an outline of a printer according to the invention. The perspective view which shows the inversion part which concerns on this invention. The schematic side view which looked at the inversion part which concerns on this invention from the width direction one end side of the paper. The schematic side view which looked at the inversion part which concerns on this invention from the width direction other end side of the paper. The schematic side view which shows the state which the rotating drum which concerns on this invention rotated 30 degree | times. The schematic side view which shows the state which the rotating drum which concerns on this invention rotated about 77 degree | times. The schematic side view which shows the state which the rotating drum which concerns on this invention rotated 120 degree | times. The schematic side view which shows the state which the rotating drum which concerns on this invention rotated 180 degree | times. The schematic side view which shows the state which the rotating drum which concerns on this invention rotated 240 degree | times. The schematic side view which shows a mode that a sheet | seat is unwound in the inversion part which concerns on this invention. FIG. 6 is a schematic side view showing a swing mechanism of a discharge roller according to another embodiment 1; (A) (B) is a schematic side view which shows operation | movement of the inversion part which concerns on other Embodiment 2. FIG. The schematic side view which looked at the inversion part which concerns on other Embodiment 3 from the width direction one end side of the paper. The schematic side view which looked at the inversion part which concerns on other Embodiment 3 from the width direction other end side of the paper. The schematic side view which looked at the inversion part which concerns on other Embodiment 4 from the width direction one end side of the paper.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view showing an outline of an interior of an ink jet printer (hereinafter referred to as “printer”) 1 as an example of a “recording apparatus” or a “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) jetting head,
Examples thereof include a bio-organic matter ejecting head used for biochip manufacturing, a sample ejecting head for ejecting a sample as a precision pipette, and the like.

As shown in FIG. 1, the printer 1 includes a placement unit 2, a feeding unit 3, a first recording unit 4, a reversing unit 5, a second recording unit 6, and a discharge unit 7. Among these, the placement unit 2 is provided so that the paper P can be placed thereon. The feeding unit 3 is provided so as to pick up the loaded paper P and feed the paper P downstream in the feeding direction (in the direction of the arrow on the Y axis) by feeding means such as a roller (not shown). Yes.

Then, the paper P is fed through the first path R1 to the fourth path R4 by flaps or the like according to the recording mode.
It is distributed to. In the case of distribution to the first route R1 to the third route R3, the first recording unit 4
Sent to. The first recording unit 4 includes a plurality of recording units 4a, 4a,.
It is comprised so that it can record with respect to the surface which is one surface. First recording unit 4
The paper P recorded at is fed to the reversing unit 5 on the downstream side in the feeding direction. The fourth route R
The paper P sorted into 4 is also sent to the reversing unit 5.
Note that the sheet P is sorted into the fourth path R4 in the mode in which recording is performed in the second recording unit 6 only on the second surface which is the back surface when one surface is the front surface. Or
This is a mode in which recording is performed only on the front surface in the second recording unit 6.

The reversing unit 5 is configured so that the paper P sent from the upstream side in the feeding direction can be reversed as necessary. When reversing the front and back, the reversing unit 5 reverses the paper P and sends the paper P to the fifth path R5. The detailed configuration of the reversing unit 5 and the operation for reversing will be described later.
On the other hand, when the front and back are not reversed, the reversing unit 5 passes the paper P as it is. Then, the paper P is further sent downstream in the feed direction by the sixth path R6.

The paper P sent from the reversing unit 5 is sent to the second recording unit 6 through the seventh path R7 to the ninth path R9. The second recording unit 6 includes a plurality of recording units 6a and 6 as in the first recording unit 4 described above.
.., and is configured to be able to record on the paper P. When the reversing unit 5 is reversed, the second recording unit 6 is provided so as to perform recording on the second surface which is the back surface.

On the other hand, when the front and back are not reversed in the reversing unit 5, that is, when the second recording unit 6 is sent through the fourth route R4 and the sixth route R6, the second recording unit 6 is directed to the first surface which is the surface. Is provided to perform recording. The paper P recorded in the second recording unit 6 is
It is sent to the discharge section 7 which is downstream in the feed direction. Further, the sheet P sent from the sixth path R6 to the tenth path R10 is also sent to the discharge unit 7.

Note that the sheet P is sorted into the tenth path R10 in a mode in which recording is performed only on the front surface in the first recording unit 4.
The discharge unit 7 is configured to discharge the sheet P sent from the second recording unit 6 and the sheet P sent by the tenth path R10 onto the tray. For example, it has a plurality of trays so that it can be sorted for each mode or for each number of copies.

Subsequently, the operation will be described in detail after the configuration of the inverting unit 5 is described.
FIG. 2 is a perspective view showing an inversion portion according to the present invention. FIG. 3 is a schematic side view of the reversing portion according to the present invention as viewed from one end in the width direction of the paper. FIG. 4 is a schematic side view of the reversing unit according to the present invention as viewed from the other end in the width direction of the paper.
As shown in FIGS. 2 to 4, the reversing unit 5 includes a first conveying roller pair 46 as a first feeding unit, a rotating drum 8, a discharge roller 39 as a second feeding unit, and a third feeding unit. A second conveying roller pair 48.

Among these, the 1st conveyance roller pair 46 is provided so that it can drive with the motive power of the motor which is not shown in figure. The paper P that is fed while being guided by the first paper guide portion 47 can be sent to the rotary drum 8 on the downstream side in the feed direction.
Note that a so-called one-way clutch having a structure that allows relative rotation in one rotational direction is built in between the roller and the shaft of the first transport roller pair 46. This is to prevent damage to the paper P when the paper P is pulled downstream by the rotating drum.

Specifically, the first conveying roller pair 4 in the rotation direction when the paper P is fed downstream in the feeding direction.
6 rollers are provided to allow rotation. That is, the paper P can be fed at a predetermined speed V1 by the first transport roller pair 46. However, when the rotary drum side pulls the paper P at a speed V2 faster than the speed V1, the first transport roller pair 46 allows it. It is configured to be able to.

A sensor 50 is provided between the first transport roller pair 46 and the rotating drum 8. The sensor 50 is configured to detect the leading edge and the trailing edge of the paper P.
The sensor 50 may be a non-contact type optical sensor having a light emitting part and a light receiving part,
A contact-type mechanical sensor that has a lever or the like and detects the lever by swinging in contact with the paper may be used.

Furthermore, the rotating drum 8 is provided so as to be able to rotate around the rotation fulcrum and to wind the paper P from the front end side which is the downstream side in the feed direction. In particular,
The rotating drum 8 has a first winding roller 22 to a third winding roller 24 around the rotation fulcrum of the rotating drum 8. First winding roller 22 to third winding roller 24
Is provided so as to be able to rotate with respect to the rotating drum 8. And the 1st winding roller 22-the 3rd winding roller 24 are provided so that the paper P sent from the feed direction upstream side can be wound.
Any number of winding rollers may be used. In the present embodiment, description will be made with three configurations.

Further, as shown in FIG. 3, the rotary drum 8 includes the second power transmission means 45 and the first guide portions 16 to 16.
Third guide portion 18, first pinching roller 19 to third pinching roller 21, and first outer peripheral surface portion 10
To third outer peripheral surface portion 12.
Among these, the second power transmission means 45 transmits the power of the motor 40 to the first winding roller 22.
It is provided so that it can be transmitted to the third winding roller 24.

Specifically, the first planetary gear 25 to the third planetary gear 27 corresponding to the first winding roller 22 to the third winding roller 24, respectively, and the sun gear 9 are provided. Of these, the first
The planetary gear 25 to the third planetary gear 27 are configured to be able to rotate integrally with the first winding roller 22 to the third winding roller 24, respectively. The rotating drum 8
It is provided so that it can mesh with the sun gear 9 fixedly provided at the position of the rotation fulcrum.

Further, a tooth portion 9 a and a toothless portion 9 b are provided on the outer periphery of the sun gear 9. Therefore, when the first planetary gear 25 to the third planetary gear 27 mesh with the tooth portion 9a of the sun gear 9,
When the rotating drum 8 rotates, power is received from the sun gear 9, and the first winding roller 22 to the third winding roller 24 can rotate. On the other hand, when the first planetary gear 25 to the third planetary gear 27 are opposed to the toothless portion 9b of the sun gear 9, since no power is received from the sun gear 9, the first winding roller 22 to the third winding roller 24 are used. Is in a so-called free state that can rotate freely.

Furthermore, the first guide part 16 to the third guide part 18 are each provided with a first winding roller 22.
-It forms along the outer periphery with a slight gap from the outer periphery of the third winding roller 24. Further, the end portions 16a to 18a of the first guide portion 16 to the third guide portion 18 are located on the outer periphery of the rotary drum 8 in order to make it easier to capture the leading end of the paper P sent from the upstream side in the feed direction. It is formed to spread outward. Therefore, the paper P can be guided so that the paper P is wound around the first winding roller 22 to the third winding roller 24.

Further, the first pinching roller 19 to the third pinching roller 21 are freely rotatable to positions located slightly downstream in the feed direction from the end portions 16a to 18a of the first guide portion 16 to the third guide portion 18, respectively. Is provided. Moreover, it is comprised so that the outer periphery of the 1st winding roller 22-the 3rd winding roller 24 may respectively circumscribe.
Accordingly, the leading ends of the paper P are the end portions 16a to 18 of the first guide portion 16 to the third guide portion 18, respectively.
From a, the 1st clamping roller 19-the 3rd clamping roller 21, and the 1st guide part 16-the 3rd guide part 18
The first winding rollers 22-corresponding to the leading ends of the paper P respectively.
Clamping can be performed by the third winding roller 24 and the first clamping roller 19 to the third clamping roller 21. And as the 1st winding roller 22-the 3rd winding roller 24 rotate, the front end side of the paper P is moved along the 1st guide part 16-the 3rd guide part 18, respectively, and the 1st winding roller 22-the 2nd Three winding rollers 24 can be wound.

Furthermore, the first outer peripheral surface portion 10 to the third outer peripheral surface portion 12 are formed on the outer periphery of the rotating drum 8 and upstream of the first winding roller 22 to the third winding roller 24 in the rotation direction of the rotating drum 8. ing. Therefore, the first outer peripheral surface portion 10 to the third outer peripheral surface portion 12 are the first
The rear end side of the paper P wound around the winding roller 22 to the third winding roller 24 can be wound respectively.

Moreover, the 1st outer peripheral surface part 10-the 3rd outer peripheral surface part 12 are provided with the 1st driven roller 13-the 3rd driven roller 15, respectively. The first driven roller 13 to the third driven roller 15 are rotatably held, and the paper P wound around the first winding roller 22 to the third winding roller 24 in cooperation with the discharge roller 39 at a predetermined position. The rear end side can be clamped. The paper P wound around in cooperation with the discharge roller 39 is provided so that it can be sent to the downstream side in the feed direction while unwinding.

Furthermore, the discharge roller 39 is rotated by the power of the motor 40 to rotate the rotating drum 8.
It is provided so as to be movable toward and away from. And in the state which approached the rotating drum 8, it rotates clockwise in FIG. Thereby, the rear end side of the paper P wound around the first winding roller 22 to the third winding roller 24 in cooperation with the first driven roller 13 to the third driven roller 15 is set to the second transport roller pair on the downstream side in the feed direction. 48 is configured to be able to send to 48. At this time, the paper P wound around the first winding roller 22 to the third winding roller 24 is configured to be unwound.

Specifically, as shown in FIG. 4, the power of the motor 40 is provided so as to be transmitted to the rotary drum 8 and the discharge roller 39 by the first power transmission means 44. The first power transmission means 44 includes a motor 40, a pinion gear 41, a drum side pulley 28, a driven pulley 36, a first toothed belt 42, a second toothed belt 43, a first gear 34, Second
And a gear 35.

Among these, the motor 40 is configured such that it can be driven forward and backward by a control unit (not shown). Incidentally, the counterclockwise rotation in FIG. 4 is the direction of forward rotation driving.
The pinion gear 41 is provided on the shaft of the motor 40. Furthermore, the drum-side pulley 28 is provided at the rotation fulcrum of the rotary drum 8. The first toothed belt 42 is wound around the small diameter portions of the pinion gear 41 and the drum-side pulley 28. Therefore, the power of the motor 40 can be transmitted to the drum-side pulley 28.

Here, between the drum-side pulley 28 and the rotating drum 8, a so-called one-way bearing having a structure that allows relative rotation in one rotation direction is incorporated. In the present embodiment, when the drum-side pulley 28 rotates counterclockwise in FIG. 4, power is transmitted also to the rotating drum 8, so the rotating drum 8 also rotates counterclockwise. On the other hand, when the drum-side pulley 28 rotates in the clockwise direction, no power is transmitted to the rotating drum 8, and the rotating drum 8 is in a stopped state.

A driven pulley 36 is provided at the swing fulcrum of the swing arm portion 37. And
The second toothed belt 43 is wound around the large diameter portion of the drum-side pulley 28 and the driven pulley 36. The swing arm portion 37 includes a first gear 34 that rotates integrally with the driven pulley 36 and a second gear 35 that rotates integrally with the discharge roller 39 provided on the free end side. Is provided. The second gear 35 is provided so as to mesh with the first gear 34. Accordingly, the power of the motor 40 can be transmitted to the discharge roller 39.

The swing arm 37 is always urged in a direction in which the discharge roller 39 approaches the rotating drum 8 by an urging means (not shown). In addition, a torsion coil spring, a leaf | plate spring, a coil spring etc. can be used as a biasing means.
A cam follower 38 is formed on the free end side of the swing arm portion 37. A pair of cam followers 38 are provided at positions facing the cams 29 formed on both sides of the rotary drum 8 in the width direction X of the paper P, and are configured to move along the cams 29.

The cam 29 is formed with first concave portions 31 to third concave portions 33 as small diameter portions at locations corresponding to the large diameter portion 30 and the first driven roller 13 to the third driven roller 15, respectively. Therefore, when the cam follower 38 faces the first driven roller 13 to the third driven roller 15, the discharge roller 39 can approach the first driven roller 13 to the third driven roller 15 to form a roller pair. When the motor 40 is driven forward, the discharge roller 39 rotates in the clockwise direction in FIG. On the other hand, the motor 40 is configured to rotate counterclockwise when driven in reverse.

A second transport roller pair 48 is provided on the downstream side of the discharge roller 39 in the feed direction. The second transport roller pair 48 is provided so that it can be driven by the power of a motor (not shown).
Therefore, the paper P sent by the discharge roller 39 while being guided by the second paper guide portion 49 can be further sent to the downstream side in the feed direction.

Next, an operation for turning the paper P upside down will be described.
FIG. 3 is a schematic side view showing a state when the first transport roller pair 46 sends the paper P before reversing the front and back to the rotary drum 8. At this time, the rotating drum 8 is stopped in a state where the first winding roller 22 is at the 12 o'clock position. In this embodiment, this position is set to the rotary drum 8.
The reference position is 0 degree.

When the rotary drum 8 is at 0 degree, the end portion 16 a of the first guide portion 16 can guide the leading edge of the fed paper P between the first guide portion 16 and the first winding roller 22. Is provided.
Note that the position (angle) of the rotating drum 8 can be determined by the control unit, for example, by providing the rotating drum 8 with a rotary encoder as position detecting means.

When the leading edge of the paper P passes the sensor 50, the control unit (not shown) can determine that the leading edge has passed the paper P. Then, at the timing when the leading edge of the paper P enters between the first guide unit 16 and the first winding roller 22, the control unit drives the motor 40 to rotate forward.
The speed at which the first transport roller pair 46 feeds the paper P is faster than the speed at which the outer periphery of the rotary drum 8 rotates.

FIG. 5 is a schematic side view showing a state where the rotating drum of the reversing unit according to the present invention is rotated by 30 degrees.
As shown in FIG. 5, when the motor 40 is driven to rotate forward, the power is transmitted by the first power transmission means 44 described above. Accordingly, the rotating drum 8 starts to rotate in the clockwise direction in the drawing.
At this time, the first winding roller 22 to the third winding roller 24 held by the rotary drum 8 start to rotate about the rotation fulcrum of the rotary drum 8.

Here, as described above, the sun gear 9 is fixed. And the rotating drum 8 is 0
In the state of 30 degrees, the first planetary gear 25 and the second planetary gear 26 are in contact with the tooth portion 9a of the sun gear 9.
Are engaged. Therefore, when the rotating drum 8 rotates in the clockwise direction in the drawing, the first winding roller 22 and the second winding roller 23 receive the power from the sun gear 9 and rotate clockwise with the respective rollers as fulcrums. On the other hand, the third planetary gear 27 is opposed to the toothless portion 9 b of the sun gear 9 and therefore receives no power from the sun gear 9. Therefore, the 3rd winding roller 24 will be in the state which stopped relatively with respect to the rotating drum 8 in the state which can rotate.

Further, since the leading end side of the paper P is fed by the first conveyance roller pair 46 between the first guide portion 16 and the first winding roller 22, the paper P enters so as to be pushed in. At this time, since the first winding roller 22 is rotating in the clockwise direction, the first winding roller 22 also acts to lightly pull the leading end side of the paper P. Accordingly, the leading end side of the paper P can be wound around the outer periphery of the first winding roller 22.

FIG. 6 is a schematic side view showing a state in which the rotating drum of the reversing unit according to the present invention is rotated about 77 degrees.
As shown in FIG. 6, when the rotating drum 8 further rotates in the clockwise direction in the drawing from the state shown in FIG. 5, the first winding roller 22 and the second winding roller 23 further rotate in the clockwise direction using the respective rollers as fulcrums. .

At this time, the leading end side of the paper P further enters between the first guide unit 16 and the first winding roller 22 by the rotation of the first transport roller pair 46 and the first winding roller 22.
That is, the amount that the paper P is wound around the outer periphery of the first winding roller 22 is increased. Then, the leading end side of the paper P reaches the first pinching roller 19 and is in a state of being pinched by the first pinching roller 19 and the first winding roller 22.

FIG. 7 is a schematic side view showing a state where the rotating drum of the reversing unit according to the present invention is rotated 120 degrees.
As shown in FIG. 7, when the rotating drum 8 further rotates in the clockwise direction in the drawing from the state shown in FIG. 6, the first winding roller 22 and the second winding roller 23 further rotate in the clockwise direction using the respective rollers as fulcrums. .

At this time, the first winding roller 22 and the first pinching roller 19 feed the leading end side of the paper P in a further winding direction so as to be drawn at a slightly higher speed than the first transport roller pair 46. Here, since the one-way clutch is built in the first transport roller pair 46 as described above, the pulling of the paper P by the first winding roller 22 and the first pinching roller 19 can be allowed. Therefore, even when the paper P is pulled downstream in the feeding direction, there is no possibility that the first transport roller pair 46 damages the paper P. At this time, the rear end on the upstream side in the feeding direction of the sheet P passes through the sensor 50 and the first sheet guide unit 4.
Exit 7

The second planetary gear 26 is disengaged from the tooth portion 9a of the sun gear 9, and the toothless portion 9
Opposite to b. Therefore, the second winding roller 23 is in a rotatable state.
In addition, the third planetary gear 27 starts to mesh with the tooth portion 9 a of the sun gear 9. Therefore, the 3rd winding roller 24 will be in the state which receives power from the sun gear 9 from the rotatable state, and rotates.

FIG. 8 is a schematic side view showing a state where the rotating drum of the reversing unit according to the present invention is rotated 180 degrees.
As shown in FIG. 8, when the rotating drum 8 further rotates in the clockwise direction in the drawing from the state shown in FIG. 7, the first winding roller 22 and the third winding roller 24 further rotate in the clockwise direction using the respective rollers as fulcrums. .
At this time, the first winding roller 22 and the first pinching roller 19 feed the leading end side of the paper P in the winding direction so as to be further drawn.

FIG. 9 is a schematic side view showing a state where the rotating drum of the reversing unit according to the present invention is rotated 240 degrees.
As shown in FIG. 9, when the rotating drum 8 further rotates in the clockwise direction in the drawing from the state shown in FIG. 8, the first winding roller 22 and the third winding roller 24 further rotate clockwise with the respective rollers as fulcrums. .

At this time, the first winding roller 22 and the first pinching roller 19 are fed in the direction of winding so that the leading end side is further drawn into the paper P. Then, the first planetary gear 25 is disengaged from the tooth portion 9a of the sun gear 9 and faces the toothless portion 9b. Accordingly, the first winding roller 22 is in a rotatable state.
Further, the second planetary gear 26 starts to mesh with the tooth portion 9 a of the sun gear 9. Therefore, the 2nd winding roller 23 will be in the state which receives power from the sun gear 9 from the state which can rotate, and will rotate.

Furthermore, since the cam follower 38 faces the first recess 31, the discharge roller 39 is
The urging force of the urging means (not shown) moves closer to the first driven roller 13 of the rotating drum 8. At this time, the discharge roller 39 and the first driven roller 13 are the first winding roller 2.
2 is configured such that the rear end side of the paper P wound around 2 can be clamped.
When the discharge roller 39 moves closer to the rotary drum 8, the discharge roller 39 receives the power of the motor 40 and rotates counterclockwise in the drawing. Therefore, there is no possibility of damaging the paper P around which the discharge roller 39 is wound immediately before the rotation of the rotary drum 8 is stopped.
Then, the control unit stops the motor 40 and stops the rotation of the rotary drum 8. Thereby, the discharge roller 39 is also stopped.

FIG. 10 is a schematic side view showing how the paper is unwound in the reversing unit according to the present invention.
As shown in FIG. 10, from the state shown in FIG. 9, the control unit drives the motor 40 in the reverse direction.
Here, the drum-side pulley 28 incorporates a one-way bearing as described above. Therefore, no power is transmitted to the rotating drum 8 even when the drum-side pulley 28 rotates clockwise in FIG. As a result, the rotating drum 8 remains stopped.

On the other hand, the power of the reverse drive of the motor 40 is the drum side pulley 28, the driven pulley 36,
It is transmitted to the discharge roller 39 via the first gear 34 and the second gear 35. Accordingly, the discharge roller 39 rotates counterclockwise in FIG. That is, it rotates in the clockwise direction in FIG.
Accordingly, the discharge roller 39 and the first driven roller 13 can cooperate to feed the rear end side of the paper P wound around the first winding roller 22 to the second transport roller pair 48 on the downstream side in the feeding direction.

At this time, the first winding roller 22 is in a rotatable state as described above. Therefore, when the discharge roller 39 and the first driven roller 13 pull the paper P wound around the first winding roller 22, the first winding roller 22 can be rotated counterclockwise in the drawing. Then, the paper P wound around the first winding roller 22 is the first
While being unwound from the winding roller 22, it can be sent to the second conveying roller pair 48.

That is, the paper P can be fed downstream in the feeding direction with the trailing edge of the paper P as the leading edge.
As a result, the paper P is unwound from the rear end side wound around the first winding roller 22 and sent to the downstream side in the feeding direction, so that the front and back of the paper P can be reversed.
Note that the amount of rotation of the discharge roller 39 in the clockwise direction is the first conveyance roller pair 46, the rotating drum 8 and the first time from when the sensor 50 detects the leading edge of the paper P to when the trailing edge is detected.
It can be calculated from the rotation amount of the winding roller 22. Therefore, the paper P can be completely unwound.

Then, the control unit stops the reverse drive of the motor 40. Accordingly, the discharge roller 39
The rotation in the clockwise direction in FIG.
The unrolled paper P is sent to the second transport roller pair 48 while being guided by the second paper guide portion 49. Then, the second transport roller pair 48 is driven by the power of a motor (not shown) to make the paper P
Is further sent downstream in the feed direction.

At this time, the rotating drum 8 is stopped with the second winding roller 23 at the 12 o'clock position. In this state, the end portion 17 a of the second guide portion 17 is provided so as to be able to guide the leading edge of the subsequent paper P <b> 1 sent between the second guide portion 17 and the second winding roller 23. ing.
And after a control part stops the forward rotation drive of the motor 40, and stops rotation of the rotating drum 8, until the unwinding paper P is sent to the downstream by the 2nd conveyance roller pair 48,
The first transport roller pair 46 is configured to send the subsequent sheet P1 to the downstream side.

When the leading edge of the succeeding sheet P1 passes the sensor 50, the control unit can determine that the leading edge has passed the succeeding sheet P1. As in the case where the leading edge of the preceding paper P enters between the first guide portion 16 and the first winding roller 22, the leading edge of the subsequent paper P1 is between the second guiding portion 17 and the second winding roller 23. The control unit drives the motor 40 to rotate in the forward direction at the timing of entering.

Accordingly, the rotating drum 8 starts to rotate in the clockwise direction in the drawing. At this time, the cam follower 38 is disengaged from the position facing the first recess 31 and faces the large-diameter portion 30. Accordingly, the discharge roller 39 moves away from the rotary drum 8. This is because the discharge roller 39 rotates counterclockwise in the drawing when the motor 40 is driven to rotate forward, and there is a risk of hindering the winding and unwinding operations of the paper P.

Thereafter, similarly to the case of the first winding roller 22, the subsequent paper P1 is wound around the second winding roller 23, and the rotary drum 8 is stopped. Then, the motor 40 is driven in reverse to unwind the succeeding paper P1 wound around the second winding roller 23 and sent to the downstream side in the feed direction by the discharge roller 39.
Subsequently, the control unit drives the motor 40 to rotate forward, winds the subsequent paper (not shown) around the third winding roller 24 as in the case of the first winding roller 22, and stops the rotating drum 8. The motor 40 is driven in reverse to unwind further subsequent paper (not shown) wound around the third winding roller 24 and sent to the downstream side in the feed direction by the discharge roller 39.

As described above, the paper P can be wound around the first winding roller 22 to the third winding roller 24, and the paper P wound by the discharge roller 39 can be unwound and reversed. Therefore, the inversion part 5 can be reduced in size compared with the conventional structure.
Further, since the plurality of winding rollers (22 to 24) are provided, the reversing operation of the succeeding paper P1 can be started before the front and back reversing of the preceding paper P is completed. As a result, the number of sheets P that can be reversed upside down per unit time can be increased. That is, it is possible to improve the efficiency of the operation of reversing the front and back.

In the above embodiment, when the rotary drum 8 is stopped, the operation of unwinding the preceding sheet P wound around one winding roller (for example, reference numeral 22) and the subsequent sheet to another winding roller (for example, reference numeral 23). Although it comprised so that the operation | movement which winds P1 may be started, it is not restricted to this.
For example, when the paper P preceding the one winding roller (for example, reference numeral 22) is being wound, the rotary drum 8 may be stopped and the subsequent paper P1 may be started to be wound on another winding roller (for example, reference numeral 24). Specifically, it is stopped at the position of the rotary drum 8 shown in FIG. 7, and the subsequent paper P1 is started to be wound around the third winding roller 24 in a state where the paper P preceding the first winding roller 22 is being wound. It may be configured.

In the present embodiment, when the rotary drum 8 is stopped, the operation of unwinding the preceding paper P wound around one winding roller (for example, reference numeral 22) and the subsequent paper P1 to the other winding roller (for example, reference numeral 23). The reason why the winding operation is started is to reduce the number of times the rotating drum 8 is stopped. Furthermore, it is for shortening the time which has stopped. That is, it is for improving the working efficiency of the operation of turning the front and back.

In the above-described embodiment, the paper P wound around the first winding roller 22 to the third winding roller 24 is pulled by driving the discharge roller 39, but the invention is not limited thereto. Needless to say, the first winding roller 22 to the third winding roller 24 may be configured to unwind the paper P that is wound by rotating in reverse by the power of the motor.

Furthermore, in the said Example, although the 1st clamping roller 19-the 3rd clamping roller 21 were provided, it is not restricted to this. Any structure that can generate a frictional resistance between the paper P and the first winding roller 22 to the third winding roller 24 to apply a feeding force to the paper P may be used. For example, the feeding force can be applied by pressing the paper P against the outer periphery of the first winding roller 22 to the third winding roller 24 with a leaf spring or the like.

Moreover, you may provide a some small hole in the outer peripheral surface of the 1st winding roller 22-the 3rd winding roller 24, and a suction means inside this winding roller. In such a case, the sheet can be attracted to the outer peripheral surface of the winding roller to apply the feeding force to the sheet.
Furthermore, heating means may be provided inside the first winding roller 22 to the third winding roller 24. In such a case, the ink recorded on the paper can be promoted to be dried and the ink can be reliably dried.

The reversing unit 5 as the medium reversing device of the present embodiment rotates the paper P, which is an example of the medium to be fed, sent from the upstream side in the feeding direction in the one direction, thereby downstream the feeding direction of the paper P. A roller serving as a roller that unwinds the rolled paper P by rotating from the leading end side and rotating in the direction opposite to the one direction, and feeds the trailing end when the paper P is wound to the downstream in the feed direction. 1
A winding roller 22 (second winding roller 23, third winding roller 24) is provided.

The reversing unit 5 as the medium reversing device of the present embodiment includes a first winding roller 22 (first winding roller) that winds the paper P that has been fed from the upstream side in the feeding direction from the leading end side that is the downstream side in the feeding direction of the paper P. 2 winding roller 23, third winding roller 24) and paper P wound around first winding roller 22 (second winding roller 23, third winding roller 24)
The paper P is fed to the first winding roller 22 (
And a discharge roller 39 as a feeding means that is unwound from the second winding roller 23 and the third winding roller 24).

In the present embodiment, the first winding roller 22 (second winding roller 23,
The third winding roller 24) is provided on a rotating drum 8 as a rotating body, and is characterized in that the third winding roller 24) rotates on a point different from the rotating fulcrum of the rotating drum 8.
Furthermore, in this embodiment, the sun gear 9 provided at the rotation fulcrum of the rotary drum 8 and fixed to the reversing unit 5, and the first winding roller 22 (second winding roller 23,
And a first planetary gear 25 (second planetary gear 26, third planetary gear 27) as a planetary gear that is provided on the third winding roller 24) and meshes with the sun gear 9.

Moreover, in this embodiment, the tooth part 9a and the toothless part 9b are provided in the outer periphery of the sun gear 9, and the paper P is fed to the first winding roller 22 (second winding roller 23,
When unwinding from the third winding roller 24), the first planetary gear 25 (second planetary gear 2) provided on the first winding roller 22 (second winding roller 23, third winding roller 24).
6. The third planetary gear 27) is characterized in that it is configured to face the toothless portion 9b.
Further, the present embodiment is characterized in that first power transmission means 44 is provided as power transmission means for transmitting the power of the motor 40 to the rotary drum 8 and the discharge roller 39.

A printer 1 as an example of a recording apparatus according to the present embodiment has a first recording unit 4 and a second recording unit 6 as recording units that record on a sheet P as an example of a recording medium, and the front and back of the sheet P. And a reversing unit 5 for reversing.
In the present embodiment, two recording units are provided. Needless to say, the number is not limited to two. Of course, it may be one, or three or more.

[Other embodiment 1]
FIG. 11 is a schematic side view showing a swing mechanism of the discharge roller according to another embodiment 1.
As shown in FIG. 11, in the reversing unit 51 of the first embodiment, the driven pulley 55 and the first gear 53 are arranged upstream of the discharge roller 39 and the second gear 35 in the feed direction Y of the discharge roller 39. Has been. That is, in the above-described embodiment (see particularly FIG. 4), the driven pulley 36 and the first gear 34 are disposed on the downstream side of the discharge roller 39 and the second gear 35 in the feed direction Y of the discharge roller 39. However, the other embodiment 1 has the opposite configuration.
Note that members that are not specifically described are the same as those in the above-described embodiment, and therefore the same reference numerals are used and description thereof is omitted.

The swing arm portion 54 is provided so that it can swing about the rotation shaft of the driven pulley 55 as a fulcrum. With this configuration, when the motor 40 is driven to rotate in the counterclockwise direction in the drawing, the first toothed belt 42, the drum-side pulley 28,
The first gear 53 can be rotated counterclockwise via the second toothed belt 43 and the driven pulley 55.

At this time, the second gear 35 can be rotated counterclockwise with the rotation center of the first gear 53 as a fulcrum. That is, the first gear 53 is the sun gear 9 and the second gear 35 is the planetary gear. Accordingly, the second gear 35 and the swing arm portion 54 can be swung counterclockwise with the rotation center of the first gear 53 as a fulcrum. As a result, the discharge roller 39 can be moved away from the rotary drum 52.

On the other hand, when the motor 40 is driven to rotate in the clockwise direction in the drawing, the first gear 53 can be rotated in the clockwise direction. Therefore, the second gear 35 and the swing arm portion 54 can be swung clockwise with the rotation center of the first gear 53 as a fulcrum. As a result, the discharge roller 39 can be moved closer to the rotary drum 52. At this time, the discharge roller 39
Rotates counterclockwise in the figure. Accordingly, in the same manner as in the above-described embodiment, the paper P wound around the first winding roller 22 to the third winding roller 24 can be unwound in cooperation with the first driven roller 13 to the third driven roller 15. And it can send to the 2nd conveyance roller pair 48.

As described above, with the configuration of the other embodiment 1, it is possible to obtain the same operational effects as the above-described embodiment. Further, the first gear 53 is connected to the swing arm portion 54 via the second gear 35.
Since the discharge roller 39 can be swung, the above-described embodiment (see FIG. 4)
The cam 29, the first concave portion 31 to the third concave portion 33, the cam follower 38, and the urging means (not shown) are not required. As a result, the discharge roller 39 can be swung with respect to the rotating drum 52 with a simpler configuration.

[Other embodiment 2]
FIGS. 12A and 12B are schematic side views showing the operation of the reversing unit according to the second embodiment. Of these, FIG. 12A shows the winding operation. On the other hand, FIG. 12B shows the unwinding operation.
As shown in FIGS. 12 (A) and 12 (B), the reversing unit 61 of the other embodiment 2 includes the winding roller 6.
2, a first pinching roller 63, a second pinching roller 64, and a guide unit 65.

Note that members that are not specifically described are the same as those in the above-described embodiment, and therefore the same reference numerals are used and description thereof is omitted.

As shown in FIG. 12A, the paper P is sent to the winding roller 62 by the first conveying roller pair 46. When the sensor 50 detects the leading edge of the paper P, the winding roller 62 starts to rotate forward in the clockwise direction in the drawing. Accordingly, the leading end side of the paper P is fed so as to be wound around the winding roller 62 while being pressed by the winding roller 62 and the first pressing roller 63.

At this time, the paper P is guided in the circumferential direction of the winding roller 62 by the guide unit 65. When the winding roller 62 further rotates in the clockwise direction, the leading end side of the paper P reaches the second nipping roller 64. Then, the sheet is fed so as to be further wound around the winding roller 62 while being pressed between the winding roller 62 and the second pressing roller 64. At this time, the paper P
May be overlapped with the rear end side of the paper P.

When the trailing edge of the paper P passes the sensor 50, the sensor 50 detects the trailing edge of the paper P. From this time, the control unit drives the winding roller 62 by a predetermined amount to stop it. Specifically, the sheet P is stopped when the rear end of the sheet P comes to a position facing the second sheet guide portion 49.
Then, as shown in FIG. 12B, the control unit drives the winding roller 62 to rotate in the counterclockwise direction in the drawing.

Therefore, it is possible to feed the paper P to the second transport roller pair 48 along the second paper guide portion 49 with the rear end side of the paper P when being wound as the head. As a result, the front and back of the paper P can be reversed.
Here, the length of the paper P can be calculated from the amount of rotation of the winding roller 62 from when the sensor 50 detects the leading edge of the paper P to when the trailing edge is detected. Therefore, based on the calculated length of the paper P, the amount by which the winding roller 62 is driven in reverse can be determined. Thereafter, the winding roller 62 is driven to rotate forward so that the succeeding sheet P1 can be turned upside down in the same manner as the preceding sheet P.

As described above, after winding the paper P around the winding roller 62, the front and back of the paper P can be reversed by unwinding from the rear end side of the paper P.
Moreover, according to this structure, it can respond to the length of any paper P.
Furthermore, similarly to the above-described embodiment, the inversion unit 61 can be downsized as compared with the conventional configuration.

The reversing unit 61 according to the second embodiment winds the paper P sent from the upstream side in the feed direction from the leading end side, which is the downstream side in the feed direction of the paper P, by rotating in the one direction. A winding roller 62 is provided as a roller that unwinds the sheet P by rotating in the direction opposite to the direction and feeds the sheet P to the downstream side in the feeding direction with the trailing edge when the sheet P is wound as the head. To do.

[Other embodiment 3]
FIG. 13 is a schematic side view of the reversing unit according to another embodiment 3 as viewed from one end side in the width direction of the sheet. FIG. 14 is a schematic side view of the reversing unit according to another embodiment 3 as viewed from the other end in the width direction of the paper.
As shown in FIG. 13, the reversing unit 71 of the third embodiment is replaced with the first belt mechanism 78 to the third belt instead of the first driven roller 13 to the third driven roller 15 of the above-described embodiment (see FIG. 3). A belt mechanism 80 is provided. The first belt mechanism 78 to the third belt mechanism 80 are provided in ranges in which the first recess 31 to the third recess 33 are formed in the circumferential direction on the outer periphery of the rotary drum 8, respectively.

Further, as shown in FIG. 14, the reversing unit 71 of the third embodiment has a third gear 72 to a fifth gear instead of the first gear 34 and the second gear 35 of the above-described embodiment (see FIG. 4). 74.
Note that members that are not specifically described are the same as those in the above-described embodiment, and therefore the same reference numerals are used and description thereof is omitted.
The third gear 72 is provided integrally with the driven pulley 75 on the same axis. The fourth gear 73 is provided so as to circumscribe the third gear 72.

Furthermore, the fifth gear 74 is circumscribed with the fourth gear 73 and is provided integrally with the discharge roller 77 on the same axis. The swing arm portion 76 is provided so as to swing about the rotation shaft of the fourth gear 73 as a fulcrum, and has a fifth gear 74, a discharge roller 77, and a cam follower 38 on the free end side. Further, the swing arm portion 76 is always urged in a direction in which the discharge roller 77 approaches the rotating drum 8 by an urging means (not shown).

Therefore, when the motor 40 is driven to rotate in the counterclockwise direction in FIG. 14, the rotary drum 8 can be rotated in the counterclockwise direction as in the above-described embodiment. Other embodiment 3
Then, unlike the embodiment described above, when the motor 40 is driven forward, the discharge roller 7
7 can be rotated counterclockwise.
This is because when the motor 40 is driven to rotate forward, the drum side pulley 28 and the second toothed belt 4 are driven.
3 and the driven pulley 75, the third gear 72 rotates counterclockwise. And third
The fourth gear 73 rotates in the clockwise direction under the power of the gear 72. Furthermore, the fifth gear 74 rotates counterclockwise upon receiving the power of the fourth gear 73.

Then, when the rotary drum 8 is rotated counterclockwise in FIG. 14 by the forward rotation of the motor 40, when the cam follower 38 faces the first concave portion 31 to the third concave portion 33, the discharge roller 77 is counteracted. The rotating drum 8 can be moved closer to the rotating drum 8 while being rotated clockwise.
As shown in FIG. 13, when the cam follower 38 faces the first recess 31, the discharge roller 77
Further, the rear end side of the paper P wound around the first winding roller 22 can be clamped by the cooperation of the first belt mechanism 78.

In addition, before the discharge roller 77 moves closer to the rotary drum 8, the tooth portion 9 of the sun gear 9.
a and one gear of the first planetary gear 25 to the third planetary gear 27 (in the case of FIG. 13, the first planetary gear 2
It is assumed that the engagement with 5) is released. That is, the discharge roller 7
Immediately before 7 moves closer to the rotating drum 8, one of the first winding roller 22 to the third winding roller 24 (the first winding roller 22 in the case of FIG. 13) around which the paper P is wound is rotated. It is configured to be free and free. Therefore, there is no possibility that the paper P is damaged when the discharge roller 8 moves closer.

Then, by feeding the rear end side of the paper P so as to be pulled downstream in the feeding direction, the paper P when the paper P wound around the first winding roller 22 is unwound and wound as in the embodiment described above. It can be sent to the second conveying roller pair 48 with the rear end as the head. As a result, the front and back of the paper P can be reversed.
Here, the difference from the above-described embodiment is that it is not necessary to stop the forward rotation driving of the motor 40 and stop the rotating drum 8.

That is, the paper P wound around the first winding roller 22 to the third winding roller 24 can be unwound while rotating the rotating drum 8 in the clockwise direction in FIG. for that reason,
The first recess 31 to the third recess 33 and the first belt mechanism 78 to the third belt mechanism 80 are provided to be somewhat long in the circumferential direction of the rotary drum 8. In other words, the first concave portion 31 to the third concave portion 33 and the first belt mechanism 78 to the third belt mechanism 80 are provided to be long so that the paper P around which the discharge roller 77 is wound can be completely unwound.
Of course, the rotation speed of the discharge roller 77 may be increased so that the paper P around which the discharge roller 77 is wound can be completely unwound.

In addition, when the first transport roller pair 46 feeds the paper P and causes the leading end of the paper P to enter between the first winding roller 22 to the third winding roller 24 and the first guide unit 16 to the third guide unit 18. By adjusting the timing, the rotary drum 8 can be made to enter without stopping. Specifically, at the timing when the end portions 16a to 18a of the first guide portion 16 to the third guide portion 18 face the first paper guide portion 47, the first transport roller pair 46 feeds the paper P downstream in the feed direction. This can be realized by sending.

As a result, the succeeding sheet P, the succeeding sheet P1, and the succeeding sheet P2 can be wound around the first winding roller 22 to the third winding roller 24 in order, respectively.

In addition, according to the timing when the first transport roller pair 46 sends the paper P to the downstream side in the feed direction,
The rotary drum 8 is rotated so that the end portions 16a to 18a of the first guide portion 16 to the third guide portion 18 are first.
You may comprise so that it may oppose with the paper guide part 47. FIG. Since the leading edge of the paper P can be detected by the sensor 50, the timing can be easily adjusted.

As described above, the reversing unit 71 according to the third embodiment receives the paper P to which the rotary drum 8 has been sent, and the first winding roller 22 to the third winding roller 2 on the leading end side of the paper P.
It is not necessary to stop the rotating drum 8 when it is wound around the wire 4. Furthermore, when the paper P is unwound from the rear end side of the paper P when it is wound and fed to the downstream side in the feed direction, it is not necessary to stop the rotating drum 8.
Further, there is no need to drive the motor 40 in the reverse direction.
As a result, the efficiency of reversing the front and back of the paper P can be improved by the amount that the rotating drum 8 is not stopped.

In the third embodiment, the first belt mechanism 78 to the third belt mechanism 80 extending in the circumferential direction of the rotary drum 8 are used, but the present invention is not limited to this.
For example, the smooth first outer peripheral surface portion 10 to the third outer peripheral surface portion 12 and the discharge roller 77 pinch the rear end side of the paper P wound in cooperation, from the first winding roller 22 to the third winding roller 24. You may comprise so that the paper P which wound may be unwound.

In the third embodiment, the paper P wound around the first winding roller 22 to the third winding roller 24 is pulled by driving the discharge roller 77, but the invention is not limited thereto. The first winding roller 22 to the third winding roller 24 are
Of course, it may be configured to unwind the paper P that is wound by rotating in reverse by the power of the motor 40.
For example, it can be configured as a reversing unit according to another embodiment 4 described below.

[Other embodiment 4]
FIG. 15 is a schematic side view of a reversing unit according to another embodiment 4 viewed from one end in the width direction of the paper.
As shown in FIG. 15, the reversing unit 81 of the third embodiment is the same as that of the third embodiment described above (FIG. 13).
The discharge roller 77, the first belt mechanism 78 to the third belt mechanism 80, and the cam 29 are replaced with an arc gear 82 and a first pinion 83 to a third pinion 85.
Note that members that are not specifically described are the same as those in the above-described embodiment, and therefore the same reference numerals are used and description thereof is omitted.

Among these, the arc-shaped gear 82 is fixed with respect to the reversing part 81 similarly to the sun gear 9,
It is provided in a range where the toothless portion 9b of the sun gear 9 in the circumferential direction is formed. The first pinion 83 has a smaller diameter than the first planetary gear 25 and is provided integrally with the first planetary gear 25 on the same axis. Similarly, the second pinion 84 has the same diameter as the first pinion 83 and is provided integrally with the second planetary gear 26 on the same axis. Similarly, the third pinion 85 has the same diameter as the first pinion 83 and is provided integrally with the third planetary gear 27 on the same axis.

Then, the rotating drum 8 rotates in the clockwise direction in the drawing, and the meshing between the first planetary gear 25 and the tooth portion 9a of the sun gear 9 is released. Thereafter, the first pinion 83 meshes with the arcuate gear 82 provided on the outside when the sun gear 9 is on the inside. At this time, the first pinion 83
Receives a force rotating counterclockwise from the arcuate gear 82. Accordingly, the first winding roller 22 can rotate counterclockwise in the drawing. That is, the first winding roller 22 can rotate in the counterclockwise direction, which is the reverse direction to the rotation direction when the paper P is wound. As a result, the paper P can be sent to the downstream side in the feed direction with the trailing edge of the paper P when it is wound while unwinding the paper P being wound. That is, the front and back of the paper P can be reversed.

The speed at which the first winding roller 22 rotates counterclockwise is determined by the rotational drum 8.
Is sufficiently larger than the speed of the clockwise rotation. This is for reliably feeding the undissolved paper P downstream in the feed direction. For this purpose, the diameter of the first pinion 83 is configured to be smaller than that of the first winding roller 22 and the first planetary gear 25.
In addition, since the discharge roller 77 of the other embodiment 3 described above is not required, the second amount is accordingly increased.
It goes without saying that the lower side of the sheet guide portion 49 is provided long along the outer periphery of the rotary drum 8.

Thereafter, when the rotating drum 8 further rotates in the clockwise direction in the figure, the first pinion 83
And the arcuate gear 82 are disengaged. The first winding roller 22 is approximately 12
When the hour position is reached, the first planetary gear 25 and the tooth portion 9a of the sun gear 9 mesh with each other. At this time, the meshing between the third planetary gear 27 and the tooth portion 9a of the sun gear 9 is released. Thereafter, like the first pinion 83 described above, the third pinion 85 meshes with an arcuate gear 82 provided on the outside when the sun gear 9 is on the inside. Thereafter, as with the first winding roller 22 described above, the third winding roller 24 feeds the paper P1 downstream in the feed direction with the rear end of the paper P1 when being wound while unwinding the subsequent paper P1 being wound. Can be sent to the side.

When the rotating drum 8 further rotates clockwise in the figure, the meshing between the second planetary gear 26 and the tooth portion 9a of the sun gear 9 is released. Thereafter, the second pinion 84 is connected to the first pinion described above.
Similarly to the pinion 83, it meshes with an arcuate gear 82 provided on the outside when the sun gear 9 is on the inside. After that, the second winding roller 23, like the first winding roller 22 described above, feeds the paper P2 in the feed direction with the rear end of the paper P2 when the paper P2 is wound while unwinding the subsequent paper P2 being unwound. It can be sent downstream.

As described above, the reversing unit 81 according to the other embodiment 4 can reversely drive the first winding roller 22 to the third winding roller 24 by the power of the motor 40 when unwinding the wound paper P. Therefore, in addition to the operational effects of the third embodiment described above, the discharge roller 77, the first belt mechanism 78 to the third belt mechanism 80, and the cam 29 of the third embodiment described above are not required. As a result, the configuration can be made simpler than the configuration of the third embodiment (see FIG. 13) described above.
That is, the front and back of the paper P can be continuously reversed without stopping the rotation of the rotary drum 8, and the swing mechanism of the discharge roller 77 of the third embodiment described above is not required.

Further, in the reversing unit 81 of the other embodiment 4, when unwinding the wound paper P, the rear end side of the paper P when wound is the other embodiment 3 (unlike the other embodiment 3 described above. It is not necessary to be located at the position where the discharge roller 77 of FIG. That is, the paper P may be completely wound around the winding rollers (22 to 24) up to the rear end of the paper P. Therefore,
In the reversing unit 81 of the other embodiment 4, the winding roller (22 to 2) when winding the paper P is wound.
The amount of winding can be increased by increasing the number of rotations of 4). As a result, it is possible to wind a longer paper P as compared with the above-described third embodiment (see FIG. 13).

Then, when unwinding the paper P, the number of rotations at the time of winding, and the winding rollers (22 to 24) after the rotation when the rotary drum 8 is rotated during unwinding to the second transport roller pair 48 Winding rollers (22-
24) can be provided for reverse rotation.
The paper P is fed to the second conveying roller pair 48 with the trailing edge of the paper P as the leading edge when wound, and then the meshing between the arcuate gear 82 and the pinions (83 to 85) is released and the winding roller (22 ˜24) may be in a free state. Second transport roller pair 48
This is because the paper P can be completely unwound from the winding rollers (22 to 24) by pulling the paper P downstream in the feed direction.
Here, the rear end side of the paper P is a winding roller (22 to 24) in a wound state.
Although it bends along the outer periphery, it tries to return to a straight posture by being unwound.

Accordingly, the paper P can be sent to the second transport roller pair 48 via the second paper guide portion 49 with the trailing edge of the paper P being wound at the top.
As a result, it is possible to surely solve even the longer paper P as compared to the above-described third embodiment (see FIG. 13). Then, a longer paper P can be sent to the downstream side in the feed direction.
That is, in the above-described third embodiment, it is not possible to cope with sheets having different lengths. However, the reversing unit 81 according to the other embodiment 4 can also correspond to sheets having different lengths.

Specifically, the longest paper that can be handled is the paper that faces the entrance of the second paper guide portion 49 when starting reverse rotation when unwinding the paper P being wound. That is, the paper is such that when it is wound, the trailing edge of the paper is not completely wound around the winding roller. And if it is the paper of the length shorter than that, and if it is the paper more than the distance from the pinching roller (19-21) to the 2nd conveyance roller pair 48 at the time of unwinding, paper of all lengths It can correspond to.
That is, it is possible to increase the length of the paper that can be handled by increasing the number of rotations when the winding rollers (22 to 24) wind and unwind the paper P.

Note that the distance at which the lower side of the second paper guide portion 49 is provided long along the outer periphery of the rotary drum 8 is such that at least the winding rollers (22 to 24) pass through the entrance of the second paper guide portion 49 and then the winding roller. It is desirable to set the distance that the rotating drum 8 is rotationally moved until (22-24) rotates once in the opposite direction. When unwinding the wound paper, the lower side of the extended second paper guide portion 49 can reliably guide the entrance of the second paper guide portion 49 with the rear end of the wound paper at the top. is there.

In addition, when the amount of rotation of the winding rollers (22 to 24) in the reverse direction when unwinding the wound paper is large, the entrance of the second paper guide portion 49 is widened so that the paper can be bent. Is desirable. This is because the difference between the paper feed amount by the winding rollers (22 to 24) and the feed amount by the second transport roller pair 48 when unwinding the paper can be absorbed.

Still further, the second transport roller pair 48 may be configured to incorporate a one-way clutch in the same manner as the first transport roller pair. In such a case, the winding roller (22-
This is to prevent damage to the paper P when the paper is fed so as to be pushed downstream in the feeding direction according to 24).

Specifically, the second conveying roller pair 4 in the rotation direction when feeding the paper P downstream in the feeding direction.
8 rollers can be provided to allow rotation. That is, the second transport roller pair 4
8, the paper P can be fed at a predetermined speed V3.
4) When the side feeds the paper P at a speed V4 faster than the speed V3, the second conveying roller pair 48 can allow it.
Further, the present invention is not limited to the above-described embodiments, and various modifications are possible 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 printer, 2 placement unit, 3 feeding unit, 4 first recording unit, 4a recording unit,
5 reversing unit, 6 second recording unit, 6a recording unit, 7 discharging unit, 8 rotating drum,
9 sun gear, 9a tooth portion, 9b toothless portion, 10 first outer peripheral surface portion,
11 2nd outer peripheral surface part, 12 3rd outer peripheral surface part, 13 1st driven roller,
14 2nd driven roller, 15 3rd driven roller, 16 1st guide part, 16a edge part,
17 2nd guide part, 17a edge part, 18 3rd guide part, 18a edge part,
19 1st clamping roller, 20 2nd clamping roller, 21 3rd clamping roller,
22 first winding roller, 23 second winding roller,
24 3rd winding roller, 25 1st planetary gear, 26 2nd planetary gear,
27 3rd planetary gear, 28 drum side pulley, 29 cam, 30 large diameter part,
31 1st recessed part, 32 2nd recessed part, 33 3rd recessed part, 34 1st gear, 35 2nd gear,
36 driven pulley, 37 swing arm, 38 cam follower, 39 discharge roller,
40 motor, 41 pinion gear, 42 first toothed belt,
43 second toothed belt, 44 first power transmission means, 45 second power transmission means,
46 1st conveyance roller pair, 47 1st paper guide part, 48 2nd conveyance roller pair,
49 Second paper guide part, 50 sensor, 51 Inversion part (of other embodiment 1),
52 rotating drum, 53 first gear, 54 swing arm, 55 driven pulley,
61 (in other embodiment 2) reversing part, 62 winding roller,
63 1st clamping roller, 64 2nd clamping roller, 65 guide part,
71 (of other embodiment 3) reversing unit, 72 3rd gear, 73 4th gear,
74 fifth gear, 75 driven pulley, 76 swing arm, 77 discharge roller,
78 1st belt mechanism, 79 2nd belt mechanism, 80 3rd belt mechanism,
81 (in other embodiment 4) reversing part, 82 arcuate gear, 83 first pinion,
84 second pinion, 85 third pinion, P paper, P1 succeeding paper,
P2 Further subsequent paper, R1 first path, R2 second path, R3 third path,
R4 4th path, R5 5th path, R6 6th path, R7 7th path, R8 8th path,
R9 9th path, R10 10th path, X paper width direction, Y feed direction

JP 2004-315195 A

Claims (6)

The medium to be fed sent from the upstream side in the feed direction is wound from the tip side that is the feed direction downstream side of the medium to be fed by rotating in one direction,
A roller is provided that unwinds the medium to be wound by rotating in a direction opposite to the one direction, and feeds the trailing end when the medium is wound to the downstream in the feeding direction. Media reversing device. A roller that winds the medium to be fed sent from the upstream side in the feeding direction from the tip side that is the downstream side in the feeding direction of the medium to be fed;
A medium reversing apparatus, comprising: a feeding unit that unwinds the medium to be fed from the roller while feeding the medium to the downstream side in the feeding direction with the rear end of the medium wound around the roller as a head. 3. The medium reversing device according to claim 1, wherein the roller is provided on a rotating body and rotates around a point different from the rotating fulcrum of the rotating body. The medium reversing device according to claim 3, wherein a sun gear provided at a rotation fulcrum of the rotating body and fixed to the medium reversing device;
A medium reversing device having a planetary gear provided on the roller and meshing with the sun gear. The medium reversing device according to claim 4, wherein a tooth portion and a toothless portion are provided on an outer periphery of the sun gear,
The medium reversing device, wherein when the medium to be fed is unwound from the roller, the planetary gear provided on the roller is opposed to the toothless portion. A recording unit for recording on a recording medium;
A reversing unit for reversing the front and back of the recording medium,
A recording apparatus comprising the medium inverting device according to claim 1, wherein the inverting unit includes the medium inverting device according to claim 1.

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