JPH07137903A - Paper sheet discharging mechanism in ink jet recording device - Google Patents

Abstract

PURPOSE:To enable ink or paper powder remaining on protrusion tips of a conveyer belt to be surely eliminated, so as to improve printing quality by providing a cleaner roller reciprocating means for reciprocating cleaner rollers in the direction perpendicular to the traveling direction of the conveyer belt. CONSTITUTION:First and second cleaner rollers 11, 12 capable of being freely rotated in the state where their rotational surfaces slightly bite protrusions 16, 17 of first and second conveyer belts 4, 5 are provided, and elliptical cam grooves 26 inclined to the vertical section are formed on fixed shafts 22 of respective cleaner rollers 11, 12. Pins 27 fixed on roller bushes 25 are engaged with respective cam grooves 26. Thereby respective cleaner rollers 11, 12 are reciprocated in the direction perpendicular to the conveying direction of recording paper sheets according to the circulation of the conveyer belts 4, 5, and many protrusions 16, 17 on respective conveyer belts 4, 5 are evenly brought in contact with the rotational surfaces of the cleaner rollers 11, 12, thereby ink or paper powder stuck on many protrusions 16, 17 on respective conveyer belts 4, 5 are removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper ejection mechanism in an ink jet recording apparatus, and more particularly to a paper ejection mechanism in an ink jet recording apparatus suitable for improving print quality.

[0002]

2. Description of the Related Art Conventionally, an ink jet recording apparatus has a structure in which recording is performed by directly ejecting ink from a nozzle portion onto a recording sheet, so that the recording sheet is touched until the ink is dried. I can't.
For this reason, in the conventional ink jet recording apparatus, a paper ejection mechanism that combines a spur or belt-shaped conveyance means having a projection on its surface and a cleaning member for removing ink, paper dust, etc. adhering to the tip of the projection. Often equipped with. As this type of ink jet recording device, for example, the one described in JP-A-63-221046 has been proposed.

FIG. 5 is a view showing an example of a paper discharge mechanism equipped in a conventional ink jet recording apparatus, and FIG. 6 is a view showing a positional relationship between a cleaner roller and a conveyor belt.
The paper discharge mechanism is a discharge roller 50 that is disposed on the back side of the printed recording paper P and discharges the recording paper P.
An endless belt 52 having a large number of protrusions 51 along the longitudinal centerline of the outer peripheral surface, which is arranged on the side facing the discharge roller 50 with the sheet surface of the recording sheet interposed therebetween, and parallel to the discharge direction of the recording sheet. 1 with the conveyor belt 52 wound around it
A pair of belt roller 53 and drive roller 54, and a water-absorbing member that is rotatably supported by a shaft 54 so that its rotation surface slightly bites into the protrusion 51 of the belt 52 and is arranged in contact with the conveyor belt 52. The cleaner roller 55 is made of a porous material having a powder absorbing property. In the figure, reference numeral 56 is a cleaner roller bush disposed between the cleaner roller 55 and the shaft 54, and the drive shafts of the discharge roller 50 and the drive roller 54 are not shown.

[0004]

However, the above-described conventional paper discharge mechanism has the following problems. Since the contact portion of the cleaner roller 55 with the projection 51 on the surface of the conveyor belt 52 exists on the same line in the circumferential direction of the cleaner roller 55, if the cleaner roller 55 is used more frequently, as shown in FIG. Ink, paper dust or the like adheres to and stays at the portion 57 along the circumferential direction of the outer peripheral surface of the cleaner roller 55, and it becomes impossible to remove the ink, paper dust or the like attached to the tips of the protrusions 51 of the belt 52. As a result, the ink, paper dust, etc. remaining on the tip of the protrusion 51 is retransferred to the recording sheet, and the protrusion 51 is formed on the recording sheet.
There was a problem that a dotted line-like stain was generated at the tip of the. Further, since the tip of the protrusion 51 of the conveyor belt 52 is formed in a sharp state so as to reduce the contact area between the protrusion 51 and the recording sheet as much as possible, when the cleaner roller 55 is used frequently, the cleaner roller 55 is used. The surface of the sheet is apt to be damaged, and as a result, the ink, paper dust and the like adhering to the tips of the projections 51 cannot be accurately removed, and thus there is a problem that the recording paper is stained as in the above case. Therefore, in order to prevent the phenomenon that the recording paper is contaminated due to the above-mentioned ink or paper dust attached to the tip of the protrusion 51, the cleaner roller 55 should be regularly cleaned or replaced with a new cleaner roller. Although it is conceivable, there arises a problem that the cleaning work and the replacement work are troublesome and the cost is high.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to improve the disadvantages of the above-mentioned conventional example, and in particular, to improve the printing quality by surely removing the ink, paper dust and the like remaining on the tips of the projections of the conveyor belt. An object of the present invention is to provide a paper discharge mechanism in a recording device.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a guide means for guiding a printed recording sheet supplied from a predetermined printing mechanism through a non-printing surface of the recording sheet, and to the guide means. The recording paper is wound around a pair of rollers arranged opposite to each other with the surface of the recording paper sandwiched therebetween, and a large number of projections are provided along the center line of the outer peripheral surface, and the printing surface of the recording paper is brought into contact with the tip of each projection. And a cleaning roller made of a porous material having a water-absorbing property and a powder-absorbing property, which is rotatably provided with its rotating surface slightly biting into the projection tip of the conveying belt. In the paper discharge mechanism of the provided inkjet recording apparatus, the cleaning roller reciprocating means for reciprocating the cleaning roller in a direction orthogonal to the traveling direction of the conveyor belt is provided. There. This is intended to achieve the above-mentioned object.

[0007]

According to the present invention, when the printed recording sheet is supplied from the printing mechanism section to the sheet discharging mechanism, the recording sheet is guided by the guide means of the sheet discharging mechanism while the non-printing surface is guided. By the circulation drive, the print surface is conveyed in a predetermined direction with the tip of the projection being in contact with the print surface. At this time, since the cleaning roller is rotatably arranged with its rotation surface slightly biting into the protrusion of the conveyor belt, it rotates in conjunction with the circulation of the conveyor belt. Further, the cleaning roller is reciprocated by the cleaning roller reciprocating means in the direction orthogonal to the traveling direction of the conveyor belt at the same time as the conveyor belt is rotated by the circulation of the conveyor belt. That is, the cleaning roller rotates while biting slightly into the tips of the projections on the conveyor belt, and reciprocates in the direction orthogonal to the traveling direction of the conveyor belt. It is possible to make uniform contact with the rotating surface. As a result, the cleaning roller can reliably suck and remove ink, paper dust, and the like attached to the tips of many protrusions on the conveyor belt.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment to which a paper discharge mechanism in an ink jet recording apparatus of the present invention is applied will be described below with reference to the drawings.

The structure of the paper discharge mechanism of the present embodiment will be described with reference to FIGS. 1 to 4. The paper discharge mechanism is provided at the rear stage side of the printing mechanism section (not shown) of the ink jet recording apparatus. The discharge mechanism includes a pair of first discharge rollers 1, a second discharge roller 2, a discharge roller drive shaft 3, a pair of endless first conveyor belts 4, a second conveyor belt 5, and a pair of first conveyors. Belt roller 6, second belt roller 7, pair of first drive roller 8, second drive roller 9, drive roller drive shaft 10, pair of first cleaner roller 1
1, 2nd cleaner roller 12 and 1st discharge roller gear 1
3, the second discharge roller gear 14, and the drive roller gear 15.

The structure of the paper discharge mechanism will be described in detail. The first discharge roller gear 13 is fixed to one end of the discharge roller drive shaft 3 in the axial direction, and the other end in the axial direction is connected to the first discharge roller gear 13.
The second discharge roller gear 14 is fixed, and further, the first discharge roller 1 and the second discharge roller 2 are fixed at positions slightly deviated from both ends of the discharge roller drive shaft 3 toward the central portion in the axial direction. ing. The first discharge roller gear 13 transmits the rotational driving force of a paper feed motor (not shown) to the first discharge roller 1 and the second discharge roller 2 via the discharge roller drive shaft 3.

The first discharge roller 1 is formed in a shape having, for example, six cutout portions 1a ... And six paper guide portions 1b .. The recording paper P (see FIG. 2) is arranged at a position facing one end side of the back surface (non-printing surface) in the width direction.
Similarly, the second discharge roller 2 has the same shape as the first discharge roller 1, and the recording paper P conveyed from the printing mechanism unit.
Is disposed at a position facing the other end side of the back surface in the width direction. The first discharge roller 1 and the second discharge roller 2 are rotationally driven in the direction of arrow Y5 in FIG. 2 by the paper feed motor via the discharge roller drive shaft 3 and the like, so that the first conveyor belt 4 and the second conveyor belt 5 are formed. The recording paper P is conveyed in cooperation with each other and discharged in the direction of arrow Y1 in FIG.

The drive roller drive shaft 10 is arranged in parallel with the discharge roller drive shaft 3 at a predetermined interval, and one end portion of the drive roller drive shaft 10 in the axial direction is
The first drive roller 8 is fixed, and the drive roller gear 15 is fixed to the other end portion in the axial direction. Further, the drive roller gear 15 is fixed at a position slightly deviated from the fixed side of the drive roller gear 15 toward the central portion side in the axial direction. Has the second drive roller 9 fixed thereto. The drive roller gear 15 meshes with the second discharge roller gear 14, and transmits the rotational driving force of the paper feed motor to the first drive roller 8 and the second drive roller 9 via the drive roller drive shaft 10. ing.

A large number of projections 16 with sharp tips are fixed to the first conveyor belt 4 at predetermined intervals along the longitudinal centerline of the outer peripheral surface of the belt. Reference numeral 4 is arranged at a position facing one end side in the width direction of the surface (printing surface) of the recording paper guided by the paper guide portion 1b of the first discharge roller 1. Similarly, the second
A large number of projections 17 with sharp tips are fixed to the conveyor belt 5 at predetermined intervals along the longitudinal centerline of the outer peripheral surface of the belt. It is arranged at a position facing the other end side in the width direction of the surface of the recording paper guided by the paper guide portion of the discharge roller 2.

The first conveyor belt 4 includes a first belt roller 6
And the first drive roller 8 is wound around the outer peripheral surface of the second drive belt 5.
And the second drive belt 9 is wound around the outer peripheral surface of the second drive roller 9. The first transport belt 4 and the second transport belt 5 are composed of a first discharge roller gear 13, a discharge roller drive shaft 3, a second discharge roller gear 14, and a drive roller. The rotational force transmitted from the paper feed motor to the first drive roller 8 and the second drive roller 9 via the gear 15 and the drive roller drive shaft 10 causes the rotational drive in the direction of arrow Y1 in FIG.

In this case, the first conveyor belt 4, the first belt roller 6, and the first drive roller 8 constitute a paper conveyor 18 for conveying one end side of the recording paper in the width direction, and similarly. , The second conveyor belt 5, the second belt roller 7,
The second drive roller 9 constitutes a paper transport unit 19 that transports the other end side in the recording paper width direction. In FIG. 2, reference numeral 20 indicates a paper support plate that supports the back side of the recording paper supplied from the printing mechanism unit, and reference numeral 21 indicates an ejection mechanism entrance guide for advancing the recording paper into the paper ejection mechanism.

The printed recording paper P supplied from the printing mechanism section (not shown) on the lower side of FIG.
One end portion side in the width direction is sandwiched by the projection 16 of the first conveyor belt 4 which constitutes the paper conveying portion 18 and the paper guide portion 1b of the first discharge roller 1, and the other end portion in the width direction thereof. The side of the first conveyor belt 4 and the second conveyor belt 5 is sandwiched between the protrusion 17 of the second conveyor belt 5 and the paper guide portion of the second discharge roller 2, and the arrow Y1 in FIG. By the circulation drive in the direction, the sheet is discharged in the direction of the arrow Y2 in FIG.

The first cleaner roller 11 is made of a porous material having a water-absorbing property and a powder-absorbing property, and is parallel to the drive roller driving shaft 10 and penetrates the first and second cleaner rollers 11 and 12. Fixed shaft 2 placed in
2 (see FIGS. 2 to 4) is rotatably supported in the Y3 direction of FIG. 3 and reciprocally movable in the Y4 direction of FIG. 3. Similarly, the twelfth cleaner roller 12 absorbs water and absorbs water. It is formed of a porous material having a powder-absorbing property and is supported via the fixed shaft 22 so as to be rotatable in the same direction as the first cleaner roller 11 and reciprocally movable in the same direction as the first cleaner roller 11. There is.

The first cleaner roller 11 is arranged such that the outer peripheral surface thereof slightly digs into the tip of the protrusion 16 of the first conveyor belt 4, and similarly, the second cleaner roller 12 is provided.
Is arranged such that its outer peripheral surface slightly bites into the tip of the protrusion 17 of the second conveyor belt 5. As a result, the first cleaner roller 11 and the second cleaner roller 12
Is rotated in conjunction with the circulation operation of the first conveyor belt 4 and the second conveyor belt 5.

The internal structure of the first cleaner roller 11 will now be described with reference to FIGS. 3 and 4. The fixed shaft 22 is provided inside the hole 24 formed in the axial direction inside the first cleaner roller 11. Is arranged in a penetrating state, and a cleaner roller bush 25 is inserted on the outer peripheral portion of the fixed shaft 22. An elliptical cam groove 26 that is inclined with respect to the vertical cross section 22a of the fixed shaft 22 is formed in the axially central portion of the fixed shaft 22 inside the first cleaner roller 11, and the cam groove 26 is formed in the cam groove 26. The pin 27 (engaging member) fixed to the inner peripheral portion of the first cleaner roller 11 is engaged.

As the first cleaner roller 11 circulates the first conveyor belt 4 in the direction of the arrow Y1 in FIG.
It is designed to rotate in the direction. Further, the first cleaner roller 11 rotates in the direction of the arrow Y3 in FIG. 3 and at the same time, the pin 27 fixed to the cleaner roller bush 25 at the inner peripheral portion of the first cleaner roller 11 has the cam groove 2 of the fixed shaft 22.
6 to move in the circumferential direction, the arrow Y4 in FIG.
It is designed to reciprocate in the direction. In this case, the second
The internal structure and operation of the cleaner roller 12 are the same as those of the first cleaner roller 11, and therefore illustration and description thereof are omitted.

Next, the operation of this embodiment configured as described above will be described.

The recording paper P, which has been printed by the printing mechanism of the ink jet recording apparatus, constitutes a paper ejection mechanism via the paper support plate 20 and the ejection mechanism entrance guide 1.
A pair of first discharge roller 1 and a second discharge roller 2 and a pair of first discharge roller 1
When the recording paper P is fed into between the conveyor belt 4 and the second conveyor belt 5, both widthwise end portions of the recording paper P and the paper guide portions of the first discharge roller 1 and the second discharge roller 2 and the first conveyor belt. 4, and is sandwiched between the large number of protrusions 16 and 17 of the second conveyor belt 5.

As the paper feed motor rotates, the first discharge roller gear 13 and the second discharge roller drive shaft 3 rotate the first discharge roller 1 and the second discharge roller 2 in the direction of arrow Y5 in FIG. , Drive roller gear 1
5, the drive roller drive shaft 10, the first drive roller 8, the second drive roller 9 through the first conveyor belt 4,
Since the second conveyor belt 5 is circularly driven in the direction of the arrow Y1 in FIG. 2 is conveyed and ejected in the direction of arrow Y2 in FIG.

At this time, the first cleaner roller 11 is
As the conveyor belt 4 is driven to circulate, the protrusions 16 of the first conveyor belt 4 bite slightly into the tips of the protrusions 16 and the arrow Y in FIG.
As the pin 27 fixed to the cleaner roller bush 25 at the inner peripheral portion of the first cleaner roller 11 rotates in the cam groove 26 along the circumferential direction while rotating in three directions, arrow Y4 in FIG. Move back and forth. Similarly, the second cleaner roller 12 rotates in the same direction as the first cleaner roller 11 while slightly biting into the tips of the many protrusions 17 of the second conveyor belt 5 as the second conveyor belt 5 circulates. , Reciprocate in the same direction.

As the first cleaner roller 11 and the second cleaner roller 12 rotate and reciprocate, the first conveyor belt 4
Projections 16 of the second conveyor belt 5
Since the tip of each of the first cleaner roller 11 and the second cleaner roller 12 evenly contacts the surface of the first cleaner roller 11 and the second cleaner roller 12, ink, paper dust, and the like attached to the tips of the large number of protrusions 16 and 17 will not contact the first cleaner roller 11 and the second cleaner roller 11. The cleaner roller 12 sucks and removes the surface of the cleaner roller 12.

As described above, according to the present embodiment, the projection 16 of the first conveyor belt 4 is used when the printed recording paper sent from the printing mechanism of the ink jet recording apparatus is discharged by the paper discharging mechanism. The first cleaner roller 11 arranged in a state of slightly intruding into the first conveyor belt 4 and the second cleaner roller 12 arranged in a state of slightly intruding into the protrusion 17 of the second conveyor belt 5, Of the first and second conveyor belts 4 and 5 by rotating reciprocally in the direction perpendicular to the conveying direction of the recording sheet while rotating in accordance with the circulation of the first and second conveying belts 4 and 5.
Since the rotating surfaces of the second cleaner rollers 11 and 12 are evenly contacted with each other, it is possible to reliably absorb the ink, paper dust, and the like adhering to the tips of the many protrusions 16 and 17 on the first and second conveyor belts 4 and 5. Can be removed.

As a result, as in the case of the conventional sheet discharging mechanism, the cleaner roller surface is in contact with the tip of the protrusion of the conveyor belt on the same line in the circumferential direction of the cleaner roller. As the frequency of use increases, ink, paper dust, etc. adheres to and stays on the circumferential portion of the cleaner roller surface, and the ink, paper dust, etc. remaining at the tip of the protrusion is retransferred to the recording paper.
It is possible to solve the problem that a dotted line-shaped stain corresponding to the tip of the protrusion is generated on the recording sheet. Therefore,
It is possible to improve the print quality on the recording paper.

[0028]

As described above, according to the paper discharging mechanism in the ink jet recording apparatus of the present invention, the cleaning roller made of the material having the water absorbing property and the powder absorbing property is rotated along with the circulation of the conveyor belt. Since it reciprocates in the direction orthogonal to the traveling direction of the conveyor belt, it is possible to make many protrusions on the conveyor belt evenly contact the rotating surface of the cleaning roller, and as a result, attach to the tips of many protrusions. It is possible to reliably suck and remove the accumulated ink and paper dust. As a result, like the cleaning roller equipped in the conventional paper discharge mechanism, the ink and paper dust are on the line along the circumferential direction of the rotating surface. It is possible to improve the print quality on the recording paper as compared with the conventional method, because it is possible to solve the problem that the adhered materials and the like are accumulated and re-transferred to the recording paper to stain the recording paper. It can exhibit a remarkable effect that.

Further, in the paper discharge mechanism of the ink jet recording apparatus of the present invention, the cleaning roller reciprocating means is formed obliquely with respect to the vertical cross section of the fixed shaft at the axial central portion of the cleaning roller penetrating portion of the fixed shaft. When the cleaning roller itself and the fixing member are provided at a location facing the cam groove on the inner peripheral portion of the cleaning roller and engaged with the cam groove, the cleaning roller itself and the fixing roller are fixed. As with the case described above, it is possible to achieve the effect that the improvement of the printing quality on the recording paper can be realized by the simple mechanism in which the shaft is slightly improved.

[Brief description of drawings]

FIG. 1 is a perspective view, partly omitted, showing the configuration of a paper discharge mechanism of the present embodiment to which the present invention is applied.

FIG. 2 is an explanatory diagram showing a positional relationship among a first discharge roller, a first conveyor belt, and a first cleaner roller in FIG.

FIG. 3 is a partially cutaway explanatory view showing a rotational movement and a reciprocating movement of a first cleaner roller in FIG.

FIG. 4 is an explanatory diagram showing an internal structure of a first cleaner roller and a shaft in FIG.

FIG. 5 is an explanatory view illustrating a configuration of a conventional paper ejection mechanism with a part omitted.

FIG. 6 is an explanatory diagram showing a positional relationship between a cleaner roller and a conveyor belt in a conventional example.

FIG. 7 is an explanatory diagram showing deposits generated on the surface of the cleaner roller in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st discharge roller as guide means 2 2nd discharge roller as guide means 4 1st conveyance belt as a conveyance belt 5 2nd conveyance belts as a conveyance belt 16,17 Protrusion 11 1st cleaner roller as a cleaning roller 12 second cleaner roller as cleaning roller 22 fixed shaft 26 cam groove as cleaning roller reciprocating means 27 pin as cleaning roller reciprocating means P recording paper

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area // B65G 45/10 A 9245-3F

Claims (2)

[Claims] 1. A guide means for guiding a printed recording paper supplied from a predetermined printing mechanism through a non-printing surface of the recording paper, and a guide means opposed to the guide means with the recording paper surface sandwiched therebetween. Conveyance that is wound around a pair of arranged rollers and has a number of protrusions provided along the center line of the outer peripheral surface and conveys the recording paper by bringing the printing surface of the recording paper into contact with the tip of each protrusion. Paper discharge in an ink jet recording apparatus provided with a belt and a cleaning roller made of a porous material having a water-absorbing property and a powder-absorbing property, which is rotatably provided with its rotating surface slightly biting into the projection tip of the conveyor belt. The mechanism includes a cleaning roller reciprocating means for reciprocating the cleaning roller in a direction orthogonal to the traveling direction of the conveyor belt. Paper ejection mechanism for recording equipment. 2. The cleaning roller is rotatably provided around a fixed shaft arranged in parallel with the roller shaft of the conveyor belt, and the cleaning roller reciprocating means cleans the fixed shaft. An elliptical cam groove formed obliquely with respect to the vertical cross section of the fixed shaft in the axial center portion of the roller penetration portion,
The sheet discharge device according to claim 1, further comprising: an engagement member that is fixed to an inner peripheral portion of the cleaning roller and faces the cam groove, and that engages with the cam groove. mechanism.