JP2001058750A - Sheet material carrier and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet material carrier and a recording device, capable of effectively preventing ink, etc., from spotting on a sheet material under conveyance. SOLUTION: A sheet material carrier is equipped with a carrying rotor couple consisting of a sheet discharge roller 15 and spur 16 for carrying a sheet material held there between, wherein the roller 15 is furnished with a groove 15a in the axial direction while the spur 16 is furnished with a tooth tip 16a contacting with the roller 15 only in its groove 15a.

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 a recording apparatus having such a sheet conveying apparatus.

[0002]

2. Description of the Related Art Conventionally, 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, a word processor, etc., is based on image information. It is configured to record an image on various sheet materials such as a sheet and a plastic thin plate.

For example, an ink-jet type recording apparatus performs recording by discharging ink from a recording head onto a sheet material such as paper, so that the recording head can be easily made compact and a high-definition image can be formed at high speed. Can be recorded,
It has advantages such as low running cost, low noise due to the non-impact method, and easy recording of a color image using multi-color impact.

Above all, a line type recording apparatus using a line type recording head in which a large number of ink ejection ports are arranged in the width direction of a sheet material can further increase the recording speed.

In the above-described recording apparatus, the sheet material conveyed by the sheet material conveying device is held in a recording area by a flat platen, and an image is recorded by a recording head held by a carriage as a holding means. After that, the sheet is discharged and conveyed by discharge means provided on the downstream side in the conveying direction.

[0006] The discharge means includes a discharge roller and a spur cleaner opposed to the spur cleaner, which is pressed and engaged with a rotating body (hereinafter also referred to as a spur) formed of metal or resin and having a protruding tip at an outer edge thereof. Is the Japanese
No. 1934810.

A sheet conveying apparatus used in an ink jet type recording apparatus transports a sheet material on the downstream side in the conveying direction of a sheet material as a recording medium with respect to a recording head position. This is performed by rotating a conveying roller or a sheet pressing member with a sheet sandwiched between a member formed of a metal or resin having a protrusion or a disk-shaped member made of a highly water-repellent material and a conveying roller. .

[0008] With this configuration, even when the recording head ejects ink onto the sheet material and the sheet pressing member passes over the ink in a state where the ink is not sufficiently absorbed or dried, the spur-shaped object is formed. Is that only the very small part of the tip of the projection contacts the sheet,
The disk-shaped object is made of a material having excellent water repellency, with the tip of the sharp edge of the outer edge being in contact with the material, thereby preventing the ink from being transferred to another position on the sheet and contaminated. .

[0009]

However, in the above-described recording apparatus, the sheet material after recording is sandwiched between the discharge rollers and the spurs to discharge the paper, so that the ink is not completely dried. When the spur is transferred on the recording surface, ink may adhere to the outer periphery of the spur tip, and the ink and paper powder are combined to accumulate on the spur every time the number of recordings is repeated, and consequently, dirt such as ink adhered to the spur. May adhere to the sheet material and the output image may become dirty.

In addition, dirt such as ink deposited on the spurs may transfer to the paper discharge roller, and the dirt on the paper discharge roller may adhere to the back surface of the sheet material, thereby contaminating the sheet material.

Furthermore, the spurs may not rotate smoothly due to dirt such as accumulated and fixed ink, which may cause a jam or the like.

In order to cope with this, in a conventional recording apparatus, it is considered that an absorber is provided in a portion of the paper discharge roller where the spur abuts, and the absorber absorbs and removes ink and the like attached to the spur. However, the workability is poor when incorporating the absorber into the paper ejection roller, and in the case where a large number of spurs are provided in the axial direction of the paper ejection roller, the absorber is attached to the paper ejection roller corresponding to each spur. In addition, there is a problem that the cost must be increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a sheet material transporting apparatus and a sheet material transporting apparatus capable of effectively preventing ink or other deposits from adhering to the sheet material when the sheet material is transported. It is an object to provide a recording device.

[0014]

In order to achieve the above object, a sheet conveying apparatus according to the present invention comprises a first conveying rotating body and a second conveying rotating body for sandwiching and conveying a sheet material. In the sheet material conveying device including a pair of conveying rotators, the first conveying rotator includes a groove in an axial direction, and the second conveying rotator is configured such that: It is characterized by having a tooth tip that contacts only the groove.

Further, after the image is recorded on the sheet material, the conveying rotating body pair conveys the sheet material on which the image is recorded.

Further, the first transport rotating body and the second transport rotating body are in contact only with the groove and the tooth tip.

Further, the apparatus is characterized in that a rotating body cleaner is provided for removing the deposits attached to the second transporting rotating body.

Further, the distance between the adjacent grooves of the first transport rotating body and the groove and the distance between the adjacent tooth tips of the second transport rotating body are different from each other. It is characterized by being equal.

Further, at least one of the grooves is
It is characterized by being formed by a cut having a shape substantially the same as the shape of the tooth tip.

Further, the recording apparatus according to the present invention is provided with recording means for recording an image on the sheet material, and the sheet material on which the image is recorded by the recording means is conveyed by the sheet material conveying device. And

Therefore, according to the sheet conveying apparatus and the recording apparatus according to the present invention, the tooth tip of the second conveying rotating body contacts only the groove of the first conveying rotating body.
For example, even when an adhering substance such as ink adheres to the tooth tip of the second transport rotating body due to the transport of the sheet material, when the transport of the sheet material is completed, the second transport rotating body becomes The tooth tip comes into contact only with the groove of the first transport rotating body, so that the deposit attached to the tooth tip does not adhere to the transport surface of the first transport rotating body. Therefore, it is possible to prevent the deposit from adhering to the sheet material, and to convey the sheet material neatly. However, the groove described in this specification is not limited to a groove having an extension in the axial direction, and may include a concave portion into which a tooth tip fits.

Further, even when a sheet material on which an image is formed is conveyed, ink or the like on the sheet material adheres to the first conveyer rotating body via the tip of the second conveyer rotating body. Therefore, the sheet material can be further conveyed neatly.

Further, since the first transport rotator and the second transport rotator are in contact only with the groove and the tooth tip, the attachment between the first transport rotator and the second transport rotator is performed. The attachment of the kimono can be more effectively prevented.

In addition, the sheet material can be conveyed more clearly by providing the adhering matter cleaner for removing the adhering matter such as ink of the second conveying rotating body.

Further, since the distance between the grooves of the first transport rotating body is equal to the distance between the tips of the second transport rotating body, the tooth tips are reliably formed into the grooves. Can be contacted.

Further, since at least one of the grooves is formed by a cut having substantially the same shape as the shape of the tooth tip, the ratio of the groove on the first transport rotating body is reduced, and Since the surface area of the transport rotator can be widened, sufficient friction can be obtained in transporting the sheet material.

The operation of the present invention will be described in more detail. In the state where the sheet material discharge / conveying performance is improved by the above-described configuration, the grooves formed in the axial direction of the first conveying rotating body are improved. The second transporting rotator as a material pressing rotary body presses the sheet material against the first transporting rotator to finish discharging the paper, and the sheet material is moved between the first transporting rotator and the second transporting rotator. When no longer exists, the tooth tip of the second transport rotator enters the groove (recess) formed in the axial direction of the first transport rotator.

Thus, for example, the tip of the tip of the second transport rotator contacts the front surface of the first transport rotator in contact with the back surface of the sheet material, that is, the second transport rotator moves from the tip of the tooth to the second transport rotator. It is possible to prevent deposits such as ink from adhering to the transport surface, and to prevent deposits such as ink from adhering to the printed sheet material from the transport surface of the first transport rotator, so that a clean printed matter can be prevented. Can be transported.

Therefore, according to the present invention, it is possible to prevent the adhesion of dirt on the conveying surface of the first conveying rotating body due to the adhesion of the ink or the like on the tooth tip of the second conveying rotating body, and to prevent the ink or the like from adhering to the sheet material. It is possible to prevent the attachment of extraneous matter.

Further, by providing the knurled shape, the groove and the like in the axial direction of the conveying surface in the first conveying rotating body, the sheet discharging performance of the sheet material after the image recording can be improved.

[0031]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The material, shape, relative arrangement, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

(First Embodiment) First, a sheet conveying apparatus and a recording apparatus according to a first embodiment of the present invention will be described with reference to the drawings.
This will be described with reference to FIGS. FIG. 1 shows a perspective view of the overall configuration of a printing apparatus according to a first embodiment of the present invention, and FIG. 2 shows a schematic side view of the printing apparatus shown in FIG.

However, a first embodiment of the recording apparatus according to the present invention described below is also a recording apparatus including the first embodiment of the sheet conveying apparatus according to the present invention. Therefore, in the following description, the description of the first embodiment of the recording apparatus according to the present invention also serves as the description of the first embodiment of the sheet material conveying apparatus according to the present invention.

In this embodiment, an ink jet type recording apparatus will be exemplified. First, a schematic configuration of a recording mechanism and a transport mechanism will be described, and then a configuration of a sheet material transport apparatus according to the present invention will be described in detail.

First, the entire recording apparatus will be described with reference to FIGS. In the present embodiment, as shown in FIG. 2, an ink jet type recording head 4 is used as recording means for recording on a recording sheet material by discharging ink droplets according to a signal.

The recording head 4 is mounted on a carriage 6, and ink is similarly supplied from an ink tank 5 mounted on the carriage 6.

As shown in FIG. 1, the carriage 6 is slidably supported by a guide shaft 8 and a guide rail 9 provided on a chassis 7 of the apparatus main body.

The carriage 6 is driven by a carriage motor (not shown), and scans (reciprocates) along the guide shaft 8 and the guide rail 9 in a direction (A1 to A2 direction) orthogonal to the transport direction.

With the above arrangement, the carriage 6 reciprocates, and ink droplets are ejected from the recording head 4 mounted on the carriage 6 in accordance with recording data, and an image is recorded on a sheet material.

Next, a mechanism for conveying the sheet material will be described. As shown in FIG. 1, a sheet material on which an image is recorded by the recording head 4 is stacked on the pressure plate 10 of the sheet feeding unit 1, and the stacking position is regulated by a side guide.

The sheet material is conveyed by a paper feed roller (not shown) provided at a position facing the pressure plate 10, separated one by one by a separation claw (not shown), and sent to the conveyance roller 12.

Next, as shown in FIG. 2, the sheet material is urged toward the transport roller 12 by the transport roller 12 and a spring, and is rotated by the pinch roller 13 driven by the transport roller 12.
(FIG. 1) and transported to a print area on the platen 14.

Here, an image is recorded on the sheet material, and is sent to a sheet discharge transport unit for discharging the sheet material provided further downstream.

As shown in FIG. 2, in the first embodiment of the sheet conveying apparatus according to the present invention, a discharging member as a first conveying rotating body, which is rotated by a driving mechanism including a motor, a gear, and the like. A paper roller 15 and a spur 16 serving as a second transport rotating body that is pressed against the paper discharge roller 15 and is driven to rotate.
And the spur holder 1 for rotatably holding the spur 16
7 are provided.

Next, the detailed structure of the sheet conveying apparatus according to the present invention shown in FIG. 2 will be described with reference to FIGS.

FIG. 3 is an enlarged schematic view of the transport mechanism when the positional relationship between the spurs and the discharge rollers shown in FIG. 2 is viewed from the front of the apparatus. In FIG.
FIG. 5 shows a state in which the spring is biased by the spring shaft 18.

As shown in FIGS. 3 and 4, the spur 16
Is provided with a tip which is an acute tip at every certain angle, and when the discharge roller 15 rotates, the spur 16 urged by the spring shaft 18 becomes a spur 16 It follows and rotates.

Next, the paper discharge transport section shown in FIG. 3 will be described with reference to FIG. FIG. 4 is a schematic sectional view of the transport mechanism shown in FIG.

As shown in FIG. 4, the sheet material conveyed from the paper feeding section is nipped by a conveyance roller 12 and a pinch roller 13 which is a driven roller, sent to a platen 14, and discharged by a paper discharge roller 15 and a spur 16. It is pinched by.

As is apparent from FIGS. 3 and 4, the discharge roller 15 has a groove (recess) 15a formed in parallel with the roller surface axis direction, and a spur 16 is attached to the discharge roller 15 by a spring shaft 18. Being energized.

The pitch between the grooves 15a formed on the paper discharge roller 15 is the same as the pitch of the tooth tip 16a of the spur 16, and the rotation of the paper discharge roller 15 causes the spur 16 to rotate. All tips 1 even when exercising
6a can be kept in a state where it has entered the concave portion on the surface of the paper discharge roller 15.

As described above, in the first embodiment of the sheet conveying apparatus and the recording apparatus according to the present invention, the sheet on which the image is recorded by the recording head 4 is sandwiched between the spur 16 and the discharge roller 15. Even if the sheet material is conveyed, after the sheet material is conveyed, the tip 16a of the spur 16 enters the groove 15a on the surface of the paper discharge roller 15, so that the spur 16 does not touch the surface in contact with the sheet material. So spur 1
6 can prevent the back surface of the sheet material from being stained by ink or the like attached to the tip 16a of the tooth tip.

(Second Embodiment) Next, a second embodiment of the sheet conveying apparatus and the recording apparatus according to the present invention will be described with reference to FIG. FIG. 5 is a schematic cross-sectional view of a second embodiment of the sheet conveying apparatus according to the present invention. In FIG. 5, a groove 25a is dug in the axial direction on the outer peripheral surface of the discharge roller 25 as the first transport rotating body. In FIG. 5, the same members as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

However, the following second embodiment of the sheet conveying apparatus according to the present invention is also a sheet conveying apparatus provided in the second embodiment of the recording apparatus according to the present invention.

Further, in the second embodiment of the recording apparatus according to the present invention, the description of the parts other than the sheet conveying apparatus is as follows.
Since this is the same as the first embodiment of the recording apparatus according to the present invention described with reference to FIG. 1, detailed description thereof will be omitted.

Therefore, in the following description, the second embodiment of the sheet conveying apparatus according to the present invention will be described.
The description of the second embodiment of the recording apparatus according to the present invention is also used.

As shown in FIG. 5, in the present embodiment,
The groove 25a (recess) formed in the paper discharge roller 25 and the groove 25
The cutout groove 25b is formed between the roller and the roller a, so that the ratio of the groove on the surface of the paper discharge roller 25 is reduced and the surface area of the roller can be increased.

Therefore, in the second embodiment of the sheet conveying apparatus according to the present invention, similarly to the above-described first embodiment, the interval between the groove 25a of the concave portion of the sheet discharging roller 25 or the cut groove 25b. And the pitch of the tip 16a as the tip of the spur 16 as the second transport rotating body is equal, and the tip 16a does not contact the surface of the paper discharge roller 25, and the tip 16a The attached matter such as ink attached to the sheet adheres to the discharge roller 25, and the attached matter such as the ink does not adhere to the sheet material.

Here, the notch-shaped groove 25a has a shape substantially the same as the shape of the tip end 16a of the spur roller 16 as is apparent from FIG. Further, the number of the cut grooves 25a is not limited to the example shown in FIG. 5, and may be at least one arbitrary number.

Further, since the contact area between the sheet material and the discharge roller 25 is larger than that of the uneven discharge roller, sufficient friction can be obtained in the conveyance.

(Third Embodiment) Next, a third embodiment of the sheet conveying apparatus and the recording apparatus according to the present invention will be described with reference to FIG. FIG. 6 shows a schematic cross-sectional view of a third embodiment of the sheet conveying apparatus according to the present invention. In FIG. 6, a groove 36a is dug in the axial direction on the outer peripheral surface of the discharge roller 26 as the first transport rotating body. In FIG. 6, the same members as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

However, the following third embodiment of the sheet conveying apparatus according to the present invention is also a sheet conveying apparatus provided in the third embodiment of the recording apparatus according to the present invention.

In the third embodiment of the recording apparatus according to the present invention, the description of the parts other than the sheet conveying apparatus is as follows.
Since this is the same as the first embodiment of the recording apparatus according to the present invention described with reference to FIG. 1, detailed description thereof will be omitted.

Therefore, in the following description, the third embodiment of the sheet conveying apparatus according to the present invention will be described.
The description of the third embodiment of the recording apparatus according to the present invention is also used.

In the third embodiment of the recording apparatus according to the present invention shown in FIG. 6, the width of the groove 36a formed by the unevenness formed in the axial direction on the outer peripheral surface of the paper discharge roller 26 is increased.

When the spur 16 serving as the second transport rotating body is driven by the discharge roller 26 and rotated by two teeth, the discharge roller 26 serves as the first transport rotating body. A convex portion on the surface of the roller 26 has a roller shape between the tooth tips of the spur 16.

Here, it is assumed that the convex portion on the surface of the paper discharge roller 26 when the tooth tip is rotated by two teeth comes between the tooth tip of the spur 16 and the pitch of the tooth tip. The sheet material conveying device is not limited to such a shape. For example, when the sheet material is rotated by an arbitrary tooth tip, such as when it is rotated by three teeth, or when it is rotated by four teeth. The protrusion on the surface of the paper discharge roller 26 may be located between the tooth tips of the spur 16.

Therefore, in the third embodiment, the tip end 16a of the spur 16 comes into contact with the surface (convex portion) of the discharge roller 26, as in the first and second embodiments. Therefore, the attached matter such as the ink attached to the tooth tip 16a does not adhere to the paper discharge roller 26, and the attached matter such as the ink is not transferred to the sheet material.

Here, the sheet conveying apparatus and the recording apparatus according to the present invention are not limited to the above embodiment, and various modifications can be made. For example, each of the above-described embodiments may include a rotating body cleaner for removing extraneous matter such as ink on the spur 16 as the second transport rotating body. By providing the rotating body cleaner, the sheet material can be conveyed more clearly.

[0070]

As described above, according to the present invention, the tooth tip of the second transport rotator that rotates following the first transport rotator contacts the first transport rotator, When rotating, the first conveying rotator surface is in contact with the sheet material by contacting only the concave and convex grooves formed in the axial direction with respect to the outer periphery of the first conveying rotator. A sheet material transport device and a recording device capable of transporting the sheet material in a clean state can be prevented because it is possible to prevent the deposit such as ink from adhering to the upper portion and to prevent show-through of the ink or the like on the sheet material. Can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of the overall configuration of a first embodiment of a recording apparatus according to the present invention.

FIG. 2 is a schematic side view of the recording apparatus shown in FIG.

FIG. 3 is an enlarged schematic view of a transport mechanism when a positional relationship between a spur and a discharge roller shown in FIG. 2 is viewed from the front of the apparatus.

FIG. 4 is a schematic cross-sectional view of the transport mechanism shown in FIG.

FIG. 5 is a schematic sectional view of a second embodiment of the sheet conveying apparatus according to the present invention.

FIG. 6 is a schematic cross-sectional view of a third embodiment of the sheet conveying apparatus according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper feeder 2 transporter 4 recording head 5 ink tank 6 carriage 7 chassis 8 guide shaft 9 guide rail 10 pressure plate 12 transport roller 13 pinch roller 14 platen 15 paper discharge roller 15a groove 16 spur 16a tooth tip 17 spur holder 18 spring Shaft 25 Discharge roller 25a Groove 25b Notch groove 26 Discharge roller 36a Groove

Claims (7)

[Claims] 1. A sheet conveying apparatus comprising: a conveying rotating body pair including a first conveying rotating body and a second conveying rotating body, which sandwiches and conveys a sheet material, wherein the first conveying rotating body is And a groove in the axial direction, wherein the second transport rotator includes a tooth tip that contacts only the groove with respect to the first transport rotator. 2. The sheet conveying apparatus according to claim 1, wherein the conveying rotator pair conveys the sheet on which the image is recorded after the image is recorded on the sheet. 3. The sheet conveying apparatus according to claim 1, wherein the first conveying rotator and the second conveying rotator contact only with the groove and the tooth tip. . 4. The sheet material transporting apparatus according to claim 1, further comprising a rotating body cleaner for removing extraneous matter attached to the second transporting rotating body. 5. An interval between the adjacent grooves of the first transport rotating body and the groove, and an interval between the adjacent tooth tips of the second transport rotating body and the tooth tip, The sheet material conveying device according to claim 1, wherein the sheet material conveying devices are equal. 6. The sheet material according to claim 1, wherein at least one of the grooves is formed by a cut having a shape substantially the same as the shape of the tooth tip. Transport device. 7. A sheet conveying apparatus according to claim 1, further comprising a recording unit for recording an image on the sheet, wherein the sheet on which the image is recorded by the recording unit is transferred by the sheet conveying apparatus according to claim 1. A recording device characterized by being transported.