JP2000247483A - Sheet conveyance device and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent change in an outside diameter of a paper feeding roller and reduce cost greatly while keeping transmission efficiency of transmission force transmitted from the paper feeding roller to a paper discharge roller. SOLUTION: In a sheet conveyance device having a paper feeding roller 14 conveying a sheet, a paper discharge roller 34 conveying a sheet or more downstream side in the conveyance direction than the paper feeding roller 14, a transmission roller 35 for transmitting driving force from the paper feeding roller 14 to the paper discharge roller 34, and an elastic shaft 41 for energizing the transmission roller 35 for the paper feeding roller 14 and the paper discharge roller 34 so as to rotate freely, the paper feeding roller 14 and the paper discharge roller 34 are formed by a material having high coefficient of friction, and the transmission roller 35 is formed by a plastic molding material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus for conveying a sheet, and more particularly, to a conveying apparatus for conveying a recording medium in a recording apparatus having functions such as a printer, a copying machine, and a facsimile.

[0002]

2. Description of the Related Art A recording apparatus having functions such as a printer, a copying machine, and a facsimile, or a recording apparatus used as an output device of a composite electronic device or a workstation including a computer or a word processor, etc. It is configured to record an image on a recording medium such as a thin plastic plate. The recording apparatus can be classified into an ink jet type, a wire dot type, a thermal type, a laser beam type and the like according to a recording method.

In a serial type printing apparatus employing a serial scan system in which main scanning is performed in a direction intersecting with a conveying direction (sub-scanning direction) of a recording medium, an image is formed by a recording means mounted on a carriage which moves along the recording medium. Is printed (main scanning), a predetermined amount of paper is fed (pitch transport) after printing of one line is completed, and then the image of the next line is printed (main scanning) on the stopped recording medium. ) Is repeated to record the entire recording medium. On the other hand, in a line-type printing apparatus that performs printing only in the sub-scanning direction in the transport direction of the printing medium, the printing medium is set at a predetermined printing position, printing is performed for one line at a time, and then a predetermined amount of paper is printed. By repeating the operation of feeding (pitch conveying) and further collectively recording the next line, recording of the entire recording medium is performed.

[0004] Among the above recording apparatuses, an ink jet recording apparatus (ink jet recording apparatus) performs recording by discharging ink from a recording means (recording head) onto a recording medium, so that it is easy to make the recording means compact. It can record high-definition images at high speed, can record on plain paper without special processing, has low running cost, and has low noise due to non-impact method. It has the advantage that it is easy to record a color image using color inks. Among them,
A line-type apparatus using a line-type recording means in which a number of ejection ports are arranged in the paper width direction can further increase the recording speed.

[0005] In particular, an ink jet type recording means (recording head) for discharging ink by using thermal energy,
Through a semiconductor manufacturing process such as etching, vapor deposition, sputtering, etc., an electrothermal converter, an electrode,
By forming the liquid path wall, the top plate, and the like, it is possible to easily manufacture a device having a high-density liquid path arrangement (discharge port arrangement), and to further reduce the size. Also,
By utilizing the advantages of the IC technology and the micromachining technology, it is easy to make the recording means longer and more planar (two-dimensional), and it is also easier to make the recording means full-multi and high-density mounting.

FIG. 8 is a perspective view of a conventional ink jet recording apparatus. In the ink jet recording apparatus, the recording medium fed by the sheet feeding device 101 is fed by a paper feed roller 1.
After being conveyed to a printing area by the platen 32 and held by a platen 122 having a flat conveying surface in the printing area, and an image formed by the recording head 124, the sheet is discharged by a sheet discharging means 133 provided on the downstream side in the conveying direction. Is done.

The recording medium transport section of the paper feed roller 132 is made of EPDM having a high coefficient of friction.

The paper discharging means 133 comprises a paper discharging roller 134, and a special paper pressing member (spur) 136 positioned opposite to the paper discharging roller 134 to press and convey the recording medium by point contact. By rotating them, a recording medium to which unfixed ink has adhered immediately after printing is conveyed.

The paper discharge roller 134 has a platen 122 at both ends of the shaft.
The recording medium conveyance section is wrapped with a material having a high friction coefficient, for example, rubber or sponge-like material, so that the recording medium conveyance section does not slip easily when the recording medium is conveyed.

A spur 136 having a toothed circumference is widely used because it hardly leaves a pressure root or an ink mark on a recording medium. The spur 136 is mounted so as to rotate about an elastic axis, and the pressing force on the recording medium is generated by the elastic axis.

The spur 136 suppresses waving (cockling) of the recording medium in a direction perpendicular to the transport direction when recording with a high recording density (duty) is performed, thereby maintaining print quality. In addition, there is an action of protecting the recording head 124 by avoiding contact between the recording head 124 and the recording medium.

The driving force of the paper discharge means 133 to the paper discharge roller 134 is transmitted from the paper feed roller 132 via a transmission roller 135. In a conventional recording apparatus, two pairs of transmission rollers 135 are provided so as to be substantially symmetrical with respect to the central axis of the apparatus. The transmission roller 135 includes a paper feed roller 132 and a paper discharge roller 13.
4 is urged by an elastic shaft so as to press against both.

In the conventional recording apparatus, the paper feed roller 13
2) Uses EPDM with a hardness of about 70 degrees for the recording medium transport section, and achieves high recording medium transport accuracy while securing the transport force (high friction coefficient) for transporting various types of recording media. Is widely used because it is possible. Also,
The driving force transmission portion of the transmission roller 135 that is in pressure contact with the paper feed roller 132 is formed of an elastomer having a hardness of about 60 degrees.
It is formed by color molding or outsert molding. Conventionally, from the EPDM paper feed roller 132 having a hardness of 70 degrees,
The hardness of about 60 degrees was appropriate for transmitting the driving force to the paper discharge roller 134 by the transmission roller 135 of the elastomer.

[0014]

However, in the conventional ink jet recording apparatus, the softener (oil component) contained in the elastomer forming the driving force transmission portion of the transmission roller 135 is transmitted by the paper feed roller 132. The transition to the EPDM at the roller contact portion, swelling, and the transmission roller 13
In some cases, the outer diameter of the paper feed roller 132 at the portion where 5 is in contact is increased.

This is a phenomenon in which oil moves from a rubber-like elastic material having a low hardness to a rubber-like elastic material having a high hardness.
The higher the contact pressure between the rollers is, the more noticeable it appears.

When the paper feed roller 132 swells as described above, the transport amount of the recording medium becomes uneven or the transport amount becomes excessive, and the image formed on the recording medium is reduced. There was a possibility that the quality of the product was lowered.

Therefore, in order to prevent the swelling of the paper feed roller 132, a measure to reduce the urging force of the elastic shaft which urges the transmission roller 135 to the paper feed roller 132 and the paper discharge roller 134 can be considered. With a decrease in efficiency, there is a possibility that the conveyance force of the paper discharge roller 134 may be reduced, or the conveyance accuracy when the recording medium is conveyed only by the paper discharge roller 134 may be reduced.

Also, there are cost problems such as the necessity of molding the parts by a molding method requiring a lot of man-hours, such as two-color molding and outsert molding, and the necessity of using an elastomer, which is an expensive material. there were.

Accordingly, a main object of the present invention is to prevent a change in the outer diameter of the paper feed roller and to greatly reduce the cost while maintaining the transmission efficiency of the transmission force from the paper feed roller to the paper discharge roller. is there.

[0020]

In order to achieve the above object, a typical configuration of the present invention is a first transport rotating body for transporting a sheet, and a sheet rotating downstream of the first transport rotating body in the transport direction. A second transport rotator for transporting, a transmission rotator for transmitting a driving force from the first transport rotator to the second transport rotator, and a first transport rotator and the second transport rotator. A sheet conveying device having a biasing means for rotatably biasing the transmission rotator, wherein the first transport rotator and the second transport rotator are formed of a material having a high coefficient of friction, and The transmission rotator is formed of a plastic mold material.

According to the above configuration, it is possible to prevent a change in the outer diameter of the first transport rotator, and to further reduce the cost while maintaining the transmission efficiency of the transmission force from the first transport rotator to the second transport rotator. Can be greatly reduced.

Further, by forming the driving force transmitting portion of the transmission rotator in contact with the first rotator and the second transport rotator in a knurl shape, the first transport rotator can be moved to the second transport rotator. It is possible to further improve the transmission efficiency of the transmission force, and to reduce the urging force of the urging means for urging the transmission rotator against the first transport rotator and the second transport rotator. Therefore, stress on peripheral components can be reduced.

In the second rotating member, the sheet conveying portion in contact with the sheet and the driving force transmitting portion in contact with the driving force transmitting portion of the transmitting rotating member are formed of the same material having a high friction coefficient. As a result, easiness in production and molding and improvement in assemblability can be expected, and cost reduction is expected due to reduction in the number of assembly steps.

In the second rotating member, the shaft portion is formed of a molding material, and the sheet conveying portion in contact with the sheet and the driving force transmitting portion in contact with the driving force transmitting portion of the transmitting rotating member are formed of an elastomer. This facilitates two-color molding, insert, and outsert molding of the second transport rotating body, so that further improvement in production and molding easiness and assemblability can be expected, and reduction in assembly man-hours and cost. Is also expected.

Further, by using a single transmitting rotary member for transmitting the driving force from the first transport rotary member to the second transport rotary member, it is possible to reduce the number of parts and the number of assembly steps, thereby reducing costs. Become.

In addition, bearing portions of the second transport rotating body are disposed at two positions on both ends, and a driving force receiving portion of the second transport rotating body is disposed in a sheet transport area, and the driving force transmitting portion is disposed in the sheet transport area. By setting the distance between the portion and the nearest bearing portion to 30 mm or less, it is possible to minimize bending, creep, and the like of the second transport rotating body.

[0027] The bearing portion of the second transport rotator is provided at two positions at both ends and at one or more locations within the shaft of the second transport rotator, and the driving force of the second transport rotator is transmitted. By disposing the portion between the bearing portion inside the shaft outside the sheet transport region and the bearing portion at one end, it is possible to prevent the second transport rotating body from bending, creeping, and the like.

Further, by providing a plurality of the second transport rotating members in the axial direction and providing a plurality of the transmitting rotary members in the axial direction corresponding to each of the second transport rotating members, the number of rotations generated according to molding conditions is increased. Thus, the influence of the deformation and runout of the shaft of the second transport rotating body is reduced, and the creep of the shaft due to the urging force can be almost completely prevented.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a sheet conveying apparatus to which the present invention is applied will be described in detail with reference to the drawings. In the following embodiments, a sheet conveying device used in a recording apparatus will be described as an example.

[First Embodiment] A recording apparatus provided with a sheet conveying apparatus according to a first embodiment will be described with reference to FIGS. The present embodiment will be described using an ink jet recording apparatus. FIG. 1 is an explanatory front view showing a schematic configuration of the ink jet recording apparatus according to the present embodiment, FIG. 2 is a cross-sectional explanatory view of the ink jet recording apparatus, FIG. 3 is a schematic diagram showing a positional relationship between respective rollers in the ink jet recording apparatus, FIG. 4 is a detailed view of a transmission roller in the inkjet recording apparatus.

The ink jet recording apparatus described in the present embodiment is a recording apparatus integrated with a recording medium (hereinafter, referred to as “sheet”) feeding apparatus, and includes a sheet feeding apparatus 1, a sheet feeding section 13, and a sheet discharging section 33. , A recording unit 25, a cleaning unit 40, and the like. Hereinafter, these configurations will be described.

First, the structure of the sheet feeding apparatus 1 will be described. As shown in FIG. 2, the sheet feeding apparatus 1 is attached to a main body of the apparatus at a predetermined angle (about 30 ° to 60 ° in the present embodiment). The set sheet P is configured to be discharged substantially horizontally after recording.

The recording head 24 is provided with a sheet P conveyed by a paper feed roller 14 and a pinch roller 15 constituting the paper feed unit 13.
Is recorded with an image such as a character by ink. As a recording unit in this apparatus, an ink jet recording system for discharging ink from a recording head for recording is used. That is, the recording head has a fine liquid discharge port (orifice), a liquid path, an energy action section provided in a part of the liquid path, and an energy generation section for generating droplet forming energy to act on the liquid in the action section. Means.

As shown in FIGS. 1 and 2, the paper feeding section 13
Paper feed roller 14, pinch roller 15, pinch roller guide 1
6, equipped with a pinch roller spring 17, a PE sensor lever 18, an upper guide 21, a platen 22, and the like.

The sheet P sent to the paper feeding section 13 is guided by a platen 22, an upper guide 21, and a pinch roller guide 16, and is sent to a nip between the paper feeding roller 14 and the pinch roller 15. A PE sensor lever 18 is rotatably provided on the upper guide 21 on the upstream side of the pair of rollers 14 and 15 in the sheet conveyance direction. When the sheet P does not exist in the conveyance path, the PE sensor lever 18 is moved relative to the rotation center. The downstream end of 18 is placed at a position where it blocks the sheet conveying path, and the upstream light-shielding portion 18a blocks a photo-interrupter-type PE sensor (not shown) from light. On the other hand, the leading end of the sheet P is
When the end of the sheet P is reached, the end of the PE sensor lever 18 is pushed up by the sheet P and rotates, the light shielding portion 18a moves, and the end of the sheet P is detected by the PE sensor (not shown) being in a light transmitting state. . This is a reference for determining the recording start position of the sheet P. The pinch roller 15 is pressed by the paper feed roller 14 by urging a pinch roller guide 16 by a pinch roller spring 17, and is rotated by the rotation of the paper feed roller 14 to generate a conveying force of the sheet P. ing. The sheet P conveyed between the paper feed roller 14 and the pinch roller 15 is driven by an LF motor
By rotating the pinch roller 14 and the pinch roller 15, the sheet is conveyed on the platen 22 to a recording start position by a predetermined amount.

The recording head 24 performs recording based on predetermined image information on the sheet P fed to the recording start position in this manner.

The recording unit 25 includes, as shown in FIGS.
A carriage 26 for mounting the recording head 24, a guide shaft 27 for reciprocally scanning the carriage 26 in a direction perpendicular to the sheet conveying direction, and holding the rear end of the carriage 26 to maintain a distance between the recording head 24 and the sheet P. Guide 28, a timing belt 30 for transmitting the drive of the carriage motor 29 to the carriage 26, an idle pulley 31 on which the timing belt 30 is stretched, and a flexible substrate 32 for transmitting a head drive signal from the electric substrate to the recording head 24. Etc. are equipped. The recording head 24 according to the present embodiment is a replaceable recording head that is formed integrally with the ink tank, and scans integrally with the carriage 26, so that the ink is applied to the sheet P conveyed on the platen 22. An image such as a character is recorded.

The cleaning unit 40 includes, as shown in FIG.
A pump (not shown) for cleaning the recording head 24,
A cap (not shown) for suppressing drying of the recording head 24,
And a drive switching arm (not shown) for switching the drive from the paper feed roller 14 to the sheet feeding device 1 and the pump.

As shown in FIGS. 1 to 3, the paper discharge unit 33 includes a paper discharge roller 34, a transmission roller 35 for transmitting the drive of the paper feed roller 14 to the paper discharge roller 34, and assists the discharge of the sheet P. Spur
Equipped with 36 mag. The sheet is discharged without soiling the sheet recording surface after recording by the sheet discharging roller 34 and the spur 36. In the present embodiment, the spur 36 is attached to a spur stay formed integrally with the platen 22.

The spur 36 has a small contact area with the sheet so that the recorded image on the sheet is not disturbed even if the sheet contacts the sheet surface after recording. In the present embodiment, a rotating body having a tooth portion that presses and conveys a sheet by point contact is used.

In the present embodiment, each of the spurs 36 constituting the spur group has a thickness of a steel plate forming a tooth portion at the tip thereof.
It is formed by etching so that 0.1 mm, the tip angle is 45 to 50 degrees, and the number of teeth is 24 (the arrangement angle is 15 degrees). Further, the tip of the tooth tip of each spur 36 is a paper discharge roller facing
An R shape of R20 to 30 μm is provided so as not to damage the surface of the conveying member 38 of 34 and the surface of the sheet P to be conveyed.

As the above-mentioned etching method, double-sided etching is employed in order to reduce costs by shortening the etching time. After arranging a plurality of spur teeth on one rectangular steel sheet, POM outsert molding is performed to form a tooth supporting rotor.

In the present embodiment, the sheet conveying portion of the paper feed roller 14 is formed so that an EPDM roller having a hardness of 70 degrees is pressed into a metal core rod. Also, transmission roller
As shown in FIG. 4, 35 is formed by injection-molding an ABS resin or the like, which is one of plastic molding materials, and a driving force transmitting portion 39 as a driving force transmitting surface thereof is formed on a solid cylindrical surface. Has become.

In this embodiment, an ABS resin is used as a plastic mold material for forming the transmission roller 35, and the transmission roller is formed by injection molding the ABS resin or the like.
Although 35 is exemplified, the present invention is not limited to this. For example, if a commonly used resin such as PC, POM, or PP is used, the same effect as that of the present embodiment can be obtained.

In the sheet discharging section 33, the sheet discharging roller 34 is constituted by a single shaft, and as shown in FIG. 3, a first bearing section 51 on the left side of the apparatus main body and a second bearing section on the right side. Bearing part
52 and is rotatably supported by
From the paper feed roller 14 through the transmission roller 35. In the present embodiment, one transmission roller 35 for driving the discharge roller 34 is provided, and the transmission roller 35 is provided with an elastic shaft 41.
As a result, it is pressed against the driving force transmission portion 37 of the paper discharge roller 34.

In the present embodiment, the paper discharge roller 34 is composed of a conveying member 38 for conveying a sheet and a driving force transmitting portion 39 of the transmitting roller 35.
The driving force transmitted portion 37 is formed of an elastomer having a hardness of 60 degrees, and is disposed between the conveying members 38 of the paper discharge rollers 34. Further, since the driving force transmission portion 37 of the discharge roller 34 is formed of a member having a high friction coefficient, high transmission efficiency can be obtained even if the driving force transmission portion 39 of the transmission roller 35 is formed of a mold resin. Obtainable.

As shown in FIGS. 1 and 3, the drive force receiving portion 37 of the paper discharge roller 34 is disposed at the leftmost transport member 38a toward the apparatus main body and at the right transport member 38a. Between the member 38b. This is a position corresponding to the inside of the transport area when the sheet is discharged. By disposing at this position, bending, creep, and the like of the paper discharge roller 34 due to a spring force can be minimized. In the case of the present embodiment, the distance from the first bearing 51 to the driving force transmitted portion 37 is:
It is about 15 mm.

Further, since the conveying member 38 of the paper discharge roller 34 is formed of the same elastomer as the driving force transmitting portion 37, the easiness of forming the parts is ensured.

In this embodiment, the transmission roller 35
The elastic shaft 41 is used as a member for urging the paper discharge roller 34, but this is a general sliding rotation shaft, and a commonly used urging member such as a compression spring, a tension spring, and a leaf spring. The same effect can be obtained even if the configuration is replaced with.

As described above, according to the present embodiment, the transmission roller 35 for transmitting the driving force from the paper feed roller 14 to the paper discharge roller 34 is formed of the mold resin.
Factors that change the outer diameter of the paper feed roller 14 can be completely eliminated, and the transmission efficiency of the transmission force from the paper feed roller 14 to the paper discharge roller 34 can be maintained.

Further, in the present embodiment, as shown in FIGS. 1 and 3, one transmission roller 35 is configured to transmit the driving force from the paper feed roller 14 to the paper discharge roller 34. Therefore, the cost, the cost, and the bending, deformation, creep, and the like of the paper discharge roller 34 can be minimized as compared with the conventional configuration in which the driving force is transmitted by the two transmission rollers.

[Second Embodiment] A sheet conveying apparatus according to a second embodiment will be described in detail. Note that the schematic configuration of the entire apparatus is the same as that of the above-described embodiment, and a detailed description thereof will be omitted. Hereinafter, features of the sheet conveying apparatus according to the present embodiment will be described in detail. The members having the same functions will be described using the same reference numerals.

In the above-described first embodiment, the surface of the driving force transmitting portion 39 of the transmitting roller 35 formed of mold resin is a solid cylindrical surface. In the present embodiment, the driving force of the transmitting roller 35 is used. The surface (cylindrical surface) of the transmission section 39 is formed in a knurled shape. As shown in FIG. 5, the knurled shape in the present embodiment has a circumferential pitch t of 0.
A flat knurl with 2 mm, height h of 0.08 mm and angle θ of 90 degrees, with radii R at the top and valley of the knurl, respectively.
It has an R shape of 0.02. Other configurations are the same as those of the above-described first embodiment.

As described above, by adopting the knurled shape on the surface of the driving force transmission portion 39 of the transmission roller 35, the transmission efficiency from the paper feed roller 14 to the paper discharge roller 34 is further increased, so that a weaker force is applied. A driving force similar to that of the configuration of the above-described first embodiment can be generated by the force. Further, with this configuration, it is not necessary to apply excessive stress to the transmission roller mounting portion and the fulcrum of the urging means, so that creep deformation and the like can be prevented. Note that, similarly to the configuration of the first embodiment, the outer diameter of the paper feed roller 14 is not changed in the configuration of the present embodiment.

[Third Embodiment] A sheet conveying apparatus according to a third embodiment will be described in detail. Note that the schematic configuration of the entire apparatus is the same as that of the above-described embodiment, and a detailed description thereof will be omitted. Hereinafter, features of the sheet conveying apparatus according to the present embodiment will be described in detail. The members having the same functions will be described using the same reference numerals.

In the above-described first embodiment, the driving force transmission portion 37 in which the transmission roller 35 contacts the paper discharge roller 34 is
Although disposed inside the first bearing portion 51 and the second bearing portion 52 of the paper discharge roller 34, in the present embodiment, as shown in FIG. 37 to the first bearing 51
And a third bearing 53 that is disposed outside the second bearing 52 and supports the shaft end. That is, unlike the above-described first embodiment, in the present embodiment, the position of the driving force transmission portion 37 of the paper discharge roller 34 is outside the conveyance area of the sheet P. Other configurations are the same as those of the above-described first embodiment.

With this configuration, it is possible to further reduce the deflection and creep of the shaft of the paper discharge roller 34.

[Fourth Embodiment] A sheet conveying apparatus according to a fourth embodiment will be described in detail. Note that the schematic configuration of the entire apparatus is the same as that of the above-described embodiment, and a detailed description thereof will be omitted. Hereinafter, features of the sheet conveying apparatus according to the present embodiment will be described in detail. The members having the same functions will be described using the same reference numerals.

In the present embodiment, as shown in FIG. 7, one paper feed roller 14 and a plurality of paper discharge rollers 34 divided in the axial direction are provided. The transmission rollers 35 for transmitting the driving force to the paper discharge rollers 34 are arranged one-to-one with respect to the respective discharge rollers 34.
Other configurations are the same as those of the above-described first embodiment.

As described above, by providing a configuration including a plurality of discharge rollers 34 divided in the axial direction, that is, a configuration in which the length of the discharge rollers 34 in the axial direction is shortened, the discharge generated according to the molding conditions. It is also possible to increase the allowable amount of warpage of the paper roller shaft. In addition, since the size of a single component is reduced, it is easy to reduce the cost by performing multi-cavity molding with one mold. Further, by employing a configuration using a plurality of small parts, it is easy to divert and deploy the parts to other models having different sizes, and it is also possible to increase the degree of freedom in design.

[Other Embodiments] In the above embodiment,
The transmission roller has been described as an example of a device configured to transmit a driving force from a paper feed roller on the upstream side in the transport direction to a discharge roller on the downstream side in the transport direction, but the present invention is not limited to this. The same effect can be obtained by applying the present invention to an apparatus configured to transmit a driving force from a discharge roller on the downstream side in the transport direction to a paper feed roller on the upstream side in the transport direction.

Further, the present invention is not limited to an apparatus having a configuration in which a driving roller transmits a driving force between a paper feed roller and a paper discharge roller. For example, a pickup roller that picks up and conveys a sheet from a storage unit such as a cassette may be used. The same effect can be obtained by applying the present invention to an apparatus configured to transmit the driving force between the pickup roller and a separation roller that separates the conveyed sheets one by one by a transmission roller.

Further, in the above-described embodiment, the sheet conveying apparatus for conveying a sheet (recording medium) such as recording paper as a recording target is exemplified. However, the present invention is not limited to this. The same effect can be obtained by applying the present invention to a sheet conveying apparatus that conveys a sheet such as a document.

In the above-described embodiment, the case of an ink jet recording apparatus using one recording head has been described as an example. However, the present invention is not limited to this.
For example, an inkjet recording apparatus for color recording using a plurality of recording heads that record with inks of different colors, or an inkjet recording apparatus for gradation recording using a plurality of recording heads that record with the same color and different density inks, The present invention can be similarly applied regardless of the number of recording heads, and can achieve the same operation and effect.

Further, as a recording means (recording head), a cartridge type in which a recording head and an ink tank are integrated, a recording head and an ink tank which are separated and connected by an ink supply tube, and the like, are used. Regardless of the configuration of the recording means and the ink tank, the same can be applied and the same effect can be achieved.

When the present invention is applied to an ink jet recording apparatus, for example, the present invention can be applied to an apparatus using a recording means using an electromechanical transducer such as a piezo element.
In particular, the present invention brings about an excellent effect in an ink jet recording apparatus using a recording means of a method of discharging ink by using thermal energy. According to such a method, it is possible to achieve higher density and higher definition of recording.

Further, the present invention can be effectively applied to a full-line type recording head having a length corresponding to the maximum width of a recording medium on which a recording apparatus can record. Such a recording head may have a configuration that satisfies the length by combining a plurality of recording heads, or a configuration as a single recording head that is integrally formed. in addition,
Even with the serial type described above, a print head fixed to the apparatus main body, or a replaceable chip that can be electrically connected to the apparatus main body or supplied with ink from the apparatus main body when attached to the apparatus main body The present invention is also effective when a recording head of a type or a cartridge type recording head in which an ink tank is provided integrally with the recording head itself is used.

It is preferable to add recording head recovery means, preliminary auxiliary means, and the like provided as components of the recording apparatus of the present invention since the effects of the present invention can be further stabilized. If these are specifically mentioned, capping means for the recording head, cleaning means, pressurizing or suction means, preheating means using an electrothermal converter or another heating element or a combination thereof, and printing Performing a preliminary ejection mode for performing another ejection is also effective for performing stable printing.

The type and number of recording heads to be mounted are, for example, not only those provided for one color ink but also a plurality of inks having different recording colors and densities. May be provided in plurality. That is, for example, as the recording mode of the recording device,
The recording mode is not limited to the recording mode of only the mainstream color such as black, and may be any combination of a plurality of recording heads integrally formed, but a device provided with at least one of multiple colors of different colors or full color by mixing colors. It can also be applied to

In addition to the above, the form of the above-mentioned ink jet recording apparatus is not only used as an image output terminal of an information processing apparatus such as a computer, but also an ink jet apparatus capable of mounting a scanner other than a recording head on a carriage. It may be a copying machine combined with an input / output device, a reader, or the like, or a facsimile machine having a transmission / reception function.

In the above-described embodiment, the ink jet recording method is exemplified as the recording method. However, the recording method is not limited to this.
Furthermore, an impact recording method such as a wire dot recording method or a recording method such as another electrophotographic method can be applied.

[0072]

As described above, according to the present invention,
A first transport rotator and a second transport rotator formed of a material having a high coefficient of friction;
Since the transmission rotator for transmitting the driving force to the transport rotator is formed of a plastic mold material, the first
Factors that change the outer diameter of the transport rotator can be completely eliminated, and the cost can be significantly reduced while maintaining the transmission efficiency of the transmission force from the first transport rotator to the second transport rotator.

Further, by forming the driving force transmitting portion of the transmission rotating body into a knurled shape, the transmission efficiency of the transmitting force from the first transport rotating body to the second transport rotating body can be further improved, and the transmission rotation speed can be improved. Since the urging force of the urging means for urging the body against the first transport rotator and the second transport rotator can be reduced, stress on peripheral components can be reduced.

Further, by forming the sheet conveying portion and the driving force transmitting portion of the second conveying rotating body with the same material having a high friction coefficient, it is expected that the production and molding are easy and the assembling property is improved. Also, cost reduction is expected due to reduction in the number of assembly steps.

Further, by forming the shaft portion of the second transport rotary member with a molding material and forming the sheet transport portion and the driving force transmitting portion (driving force transmitting surface) with an elastomer, the second transport rotating member is formed. Since the two-color molding, insert, and outsert molding are facilitated, further improvement in production / molding easiness and assemblability can be expected, and cost reduction is expected due to reduction in the number of assembly steps.

Further, by using only one transmission rotary member for transmitting the driving force from the first transport rotary member to the second transport rotary member, cost can be reduced by reducing the number of parts and the number of assembly steps.

Further, bearing portions of the second transport rotating body are provided at two positions on both ends, and a driving force receiving portion of the second transport rotating body is provided in a sheet transport area, and the driving force receiving portion is provided. By setting the distance between the transmitting portion and the nearest bearing portion to 30 mm or less, it is possible to minimize the bending, creep, and the like of the second transport rotating body.

Further, one or more bearing portions of the second transport rotator are provided at two ends and at one or a plurality of positions in the axis of the second transport rotator, and the driving force of the second transport rotator is transmitted. By disposing the portion between the bearing portion inside the shaft outside the sheet conveyance region and the bearing portion at one end, it is possible to prevent bending, creep, and the like of the second conveyance rotating body.

In addition, a plurality of the second transport rotators are provided in the axial direction, and a plurality of transmission rotators are provided in the axial direction corresponding to each of the second transport rotators. The effect of deformation and runout of the shaft of the second transport rotating body is reduced, and creep of the shaft due to the urging force can be almost completely prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory front view showing a schematic configuration of a recording apparatus according to a first embodiment.

FIG. 2 is an explanatory cross-sectional view of the recording apparatus according to the first embodiment.

FIG. 3 is a schematic diagram illustrating a positional relationship between respective rollers in the recording apparatus according to the first embodiment.

FIG. 4 is a detailed view of a transmission roller in the recording apparatus according to the first embodiment.

FIG. 5 is a detailed view of a transmission roller in the recording apparatus according to the second embodiment.

FIG. 6 is a schematic diagram illustrating a positional relationship between rollers in a recording apparatus according to a third embodiment.

FIG. 7 is a schematic diagram illustrating a positional relationship between rollers in a recording apparatus according to a fourth embodiment.

FIG. 8 is an explanatory perspective view of a conventional recording apparatus.

[Explanation of symbols]

 P: Sheet 1: Sheet feeding device 13: Paper feed unit 14: Paper feed roller 15: Pinch roller 16: Pinch roller guide 17: Pinch roller spring 18: PE sensor lever 18a: Light shielding unit 21: Upper guide 22: Platen 23 LF motor 24 Recording head 25 Recording section 26 Carriage 28 Guide 29 Carriage motor 30 Timing belt 31 Idle pulley 32 Flexible board 33 Paper discharge section 34 Paper discharge roller 35 Transmission roller 36 Spur 37… Drive force transmission part 38, 38a, 38b… Conveying member 39… Drive force transmission part 41… Elastic shafts 51, 52, 53… Bearing part

Claims (10)

[Claims] A first conveying rotator for conveying a sheet, a second conveying rotator for conveying a sheet downstream of the first conveying rotator in the conveying direction, and a second conveying rotator from the first conveying rotator. A transmission rotator for transmitting a driving force to the rotator; and urging means for rotatably urging the transmission rotator with respect to the first transport rotator and the second transport rotator. In the sheet conveying apparatus, the first conveying rotator and the second conveying rotator are formed of a material having a high friction coefficient, and the transmission rotator is formed of a plastic mold material. 2. The sheet conveying device according to claim 1, wherein a driving force transmitting portion of the transmission rotating body that contacts the first rotating body and the second transport rotating body is formed in a knurled shape. 3. The second conveying rotating body, wherein a sheet conveying section in contact with a sheet and a driving force transmitting section in contact with a driving force transmitting section of the transmitting rotating body are formed of the same material having a high coefficient of friction. The sheet conveying device according to claim 1, wherein: 4. The second conveying rotating body has a shaft portion formed of a molding material, and a sheet conveying portion in contact with a sheet and a driving force receiving portion in contact with a driving force transmitting portion of the transmitting rotating member are formed of an elastomer. The sheet conveying device according to claim 1, wherein: 5. The sheet conveying apparatus according to claim 1, wherein there is a single transmitting rotating body for transmitting a driving force from the first conveying rotating body to the second conveying rotating body. 6. The driving force transmission unit according to claim 6, wherein bearing portions of the second conveyance rotation unit are disposed at two positions on both ends, and a driving force transmission unit of the second conveyance rotation unit is disposed in a sheet conveyance region. 2. The sheet conveying apparatus according to claim 1, wherein a distance between the portion and the nearest bearing portion is set to 30 mm or less. 7. The bearing of the second transport rotator is provided at two locations at both ends and at one or a plurality of locations in the axis of the second transport rotator, and the driving force of the second transport rotator is transmitted. The sheet conveying device according to claim 1, wherein the portion is disposed between a bearing portion inside the shaft outside the sheet conveying region and a bearing portion at one end. 8. The apparatus according to claim 1, wherein a plurality of said second transport rotators are provided in the axial direction, and a plurality of said transmission rotators are provided in the axial direction corresponding to each second transport rotator. Item 1
3. The sheet conveying device according to 1. 9. Recording means for recording an image on a recording medium,
A printing apparatus comprising: a conveying unit configured to convey a recording medium; and a sheet conveying device according to claim 1 as the conveying unit. 10. The recording apparatus according to claim 9, wherein the recording apparatus is an inkjet recording type recording unit in which the recording unit discharges ink according to a signal to perform recording.