CN211280291U - Printing device - Google Patents

Abstract

The present application provides a printing device. In the printing apparatus of the structure in which the conveyance roller is supported from the lower part by the support roller, the portion of the conveyance roller in contact with the support roller is made highly durable, and the wear of the conveyance roller is suppressed. A printing device (1) is configured to include a conveying roller (3) that conveys a medium (P), and a backup roller (11) that supports the conveying roller (3) from a side opposite to the medium (P), wherein the conveying roller ( 3) The portion (7) of the outer peripheral surface (5) in contact with the backup roller (11) has an outer peripheral layer (15) harder than the outer peripheral portion (13) of the backup roller (11).

Description

printing device

technical field

The utility model relates to a printing device such as an ink jet printer and a manufacturing method of a conveying roller used for the printing device.

Background technique

Patent Document 1 discloses a bearing using a metal bearing instead of a resin-made sliding bearing as a bearing of a conveying roller. Thereby, it can be said that the problems such as wear of the bearing are reduced compared with the sliding bearing made of resin.

Patent Document 1: Japanese Patent Laid-Open No. 2017-100290

However, in the bearing described in Patent Document 1, since the metal bearing is made of a material harder than the conveyance roller, there is a concern that the conveyance roller is worn. The hardness of the surface of the conveying roller can be increased by chrome plating or the like, but a large-scale facility is required, and the manufacturing cost is increased.

Utility model content

The printing apparatus according to the first aspect of the present invention is characterized by comprising: a conveying roller to convey a medium; and a backup roller that supports the conveying roller from a side opposite to the medium, and an outer peripheral surface of the conveying roller is characterized in that: The portion in contact with the backup roller has an outer peripheral layer harder than the outer peripheral portion of the backup roller.

According to this aspect, since the portion of the outer peripheral surface of the conveyance roller that is in contact with the backup roller has the outer peripheral layer harder than the outer peripheral portion of the backup roller, wear of the conveyance roller can be suppressed. Even if the backup roller is made of a material as hard as the existing metal bearing (for example, SUJ (high carbon chromium bearing steel) material, SCr (chromium steel) material), since the conveying roller is harder, it is possible to inhibit its wear.

In addition, since the base material of the conveying roller is provided with the hard outer peripheral layer on its surface, the base material itself can be made of a material with low abrasion resistance. Thereby, the degree of freedom in the material selection of the base material of the conveyance roller is improved, and cost reduction can be easily achieved.

The printing apparatus according to the second aspect of the present invention is characterized in that a portion of the conveying roller that is in contact with the back-up roller is smaller than an outer peripheral surface formed by a portion that is not in contact with the back-up roller but is in contact with the medium. recessed.

According to this aspect, the portion of the conveying roller that is in contact with the back-up roller is more recessed than the outer peripheral surface formed by the portion that is not in contact with the back-up roller but is in contact with the medium. In other words, the portion of the conveying roller that is in contact with the backup roller is not in contact with the medium when conveying the medium due to the recess. Thereby, the conveying force provided by the conveying roller to the medium may not be affected by the recessed portion, and thus, the conveying state is stable.

The printing apparatus according to the third aspect of the present invention is characterized in that a portion of the conveying roller that is not in contact with the backup roller but is in contact with the medium is provided with a conveying function that contacts the medium and provides conveying force Floor.

According to this aspect, the conveyance action layer is provided at the portion of the conveyance roller that is in contact with the medium (the portion not in contact with the backup roller), and therefore, it is possible to easily select the material of the conveyance action layer appropriately. to stabilize the transport of the medium.

The printing device according to the fourth aspect of the present invention is characterized in that the outer peripheral layer is provided on a groove portion formed on the outer peripheral surface of the base material of the conveying roller, and the outer peripheral surface formed by the outer peripheral layer is the same as the outer peripheral surface. The outer peripheral surface of the substrate is flush.

According to this aspect, since the outer peripheral layer is provided in the groove portion formed on the outer peripheral surface of the base material of the conveying roller, the fixed state of the outer peripheral layer on the conveying roller can be made firm. In addition, since the outer peripheral surface formed by the outer peripheral layer is flush with the outer peripheral surface of the base material, it can be easily produced as compared with known cylindrical grinding.

The printing device according to the fifth aspect of the present invention is characterized in that the base material of the conveying roller is free-cutting steel, and the outer peripheral layer is an alloy tool steel.

According to this aspect, it is possible to easily manufacture using common materials such as free-cutting steel and alloy tool steel.

The printing apparatus according to the sixth aspect of the present invention is characterized in that the printing apparatus includes a pressing roller for pressing the medium to the conveying roller.

By providing the pressing roller, the conveyance of the medium can be stabilized, but the force with which the conveying roller is pressed against the backup roller also increases according to the pressing force of the pressing roller. Therefore, the wear problem of the conveying roller tends to occur, but according to the present aspect, this problem can be suppressed due to the presence of the hard outer peripheral layer.

The printing apparatus according to the seventh aspect of the present invention is characterized in that both end portions of the conveying roller not facing the medium are rotatably supported by bearings, and the support roller is located at two of the conveying rollers. the area between the bearings at the ends.

According to this aspect, the two end parts of the conveying roller not facing the medium are rotatably supported by bearings, and the support roller is located in the region between the bearings at the both ends of the common intermediate support structure. The effects of the above-mentioned aspects are obtained in the conveying roller.

Description of drawings

1 : is a figure which shows the printing apparatus which concerns on Embodiment 1 of this invention, and is a front view which shows a conveyance roller, a backup roller, a pressing roller, and these support structures.

2 is a diagram showing the printing apparatus according to the first embodiment, and is a side cross-sectional view showing a conveyance roller, a backup roller, a pressing roller, a print head, and a support structure thereof.

3 is a diagram showing a configuration around a conveyance roller of the printing apparatus according to the first embodiment, and is a front view showing a conveyance roller and a backup roller.

4 is a diagram showing a configuration around a conveyance roller of the printing apparatus according to the first embodiment, and is a side cross-sectional view showing the conveyance roller and the backup roller.

5 is a diagram showing a configuration around a conveyance roller of the printing apparatus according to the first embodiment, and is a longitudinal front view showing a conveyance roller and a backup roller.

6 : is a figure which shows the structure of the periphery of the conveyance roller of the printing apparatus which concerns on Embodiment 2 of this invention, and is a longitudinal cross-sectional front view which shows a conveyance roller and a backup roller.

7 : is a figure which shows the structure of the periphery of the conveyance roller of the printing apparatus which concerns on Embodiment 3 of this invention, and is a longitudinal cross-sectional front view which shows a conveyance roller and a backup roller.

It is a figure which shows the process of the manufacturing method of the conveyance roller which concerns on Embodiment 4 of this invention, and is an explanatory figure which shows the shaft part formation process.

It is a figure which shows the process of the manufacturing method of the conveyance roller which concerns on this Embodiment 4, and is an explanatory figure which shows the shaft part grinding|polishing process.

It is a figure which shows the process of the manufacturing method of the conveyance roller which concerns on this Embodiment 4, and is an explanatory figure which shows the outer peripheral layer formation process.

FIG. 11 is a diagram showing the steps of the method of manufacturing the conveyance roller according to the fourth embodiment, and is an explanatory diagram showing the outer peripheral layer polishing step.

FIG. 12 is a diagram showing a process of the method of manufacturing a conveyance roller according to the fourth embodiment, and is an explanatory diagram showing a shielding process.

FIG. 13 is a diagram showing the steps of the method of manufacturing a conveyance roller according to the fourth embodiment, and is an explanatory diagram showing a plating layer forming step.

It is a figure which shows the process of the manufacturing method of the conveyance roller which concerns on this Embodiment 4, and is an explanatory figure which shows a coating process.

It is a figure which shows the process of the manufacturing method of the conveyance roller which concerns on Embodiment 5 of this invention, and is an explanatory figure which shows the formation process of a shaft part / a groove part.

FIG. 16 is a diagram showing the steps of the method of manufacturing the conveyance roller according to the fifth embodiment, and is an explanatory diagram showing the outer peripheral layer forming step.

It is a figure which shows the process of the manufacturing method of the conveyance roller which concerns on this Embodiment 5, and is an explanatory figure which shows the grinding|polishing process of a shaft part and an outer peripheral layer.

FIG. 18 is a diagram showing the steps of the method of manufacturing a conveyance roller according to the fifth embodiment, and is an explanatory diagram showing a shielding step.

FIG. 19 is a diagram showing a process of the method of manufacturing a conveyance roller according to the fifth embodiment, and is an explanatory diagram showing a plating layer forming process.

It is a figure which shows the process of the manufacturing method of the conveyance roll which concerns on this Embodiment 5, and is an explanatory figure which shows a coating process.

It is a figure which shows the process of the manufacturing method of the conveyance roller which concerns on Embodiment 6 of this invention, and is an explanatory figure which shows the formation process of a shaft part / a groove part.

FIG. 22 is a diagram showing the steps of the method of manufacturing a conveyance roller according to the sixth embodiment, and is an explanatory diagram showing a shaft portion grinding step.

FIG. 23 is a diagram showing a process of the method of manufacturing a conveyance roller according to the sixth embodiment, and is an explanatory diagram showing a plating layer forming process.

FIG. 24 is a diagram showing the steps of the method of manufacturing the conveyance roller according to the sixth embodiment, and is an explanatory diagram showing the outer peripheral layer forming step.

FIG. 25 is a diagram showing the steps of the method of manufacturing the conveyance roller according to the sixth embodiment, and is an explanatory diagram showing the outer peripheral layer polishing step.

FIG. 26 is a diagram showing a process of the method of manufacturing a conveyance roller according to the sixth embodiment, and is an explanatory diagram showing a coating process.

Description of reference numerals

1. Printing unit, 2. Printer body, 3. Conveying roller, 4. Frame, 5. Outer peripheral surface, 7. Part in contact with the backup roller, 9. Part in contact with the medium, 11. Back-up roller, 13. Outer peripheral portion, 15. Outer peripheral layer, 17 supporting parts, 19 supporting bases, 21 pressing rollers, 23 bearings, 25 printing heads, 27 carriages, 29 guides, 31 grooves, 33 holes, 35 shaft parts, 37 plating layers, 39 transmission action layers, 41 groove parts , 43 shaft blank, 45 masking tape, P medium, A conveying direction, B width direction, D outer diameter, t thickness, u thickness, v thickness, E depth, W raw material, Q1 shaft part forming process, Q2 shaft part grinding Process, Q3 outer peripheral layer forming process, Q4 outer peripheral layer grinding process, Q5 masking process, Q6 plating layer forming process, Q7 coating process, R1 shaft part/groove part forming process, R2 outer peripheral layer forming process, R3 shaft part/outer peripheral layer Grinding process, R4 masking process, R5 plating layer forming process, R6 coating process, S1 shaft part/groove part forming process, S2 shaft part grinding process, S3 plating layer forming process, S4 outer peripheral layer forming process, S5 peripheral layer grinding process, S6 painting process.

Detailed ways

First, the present invention will be briefly described.

A printing apparatus according to a first aspect of the present invention for solving the above-mentioned problems is characterized by comprising: a conveying roller for conveying a medium; and a backup roller that supports the conveying roller from a side opposite to the medium, and the conveying A portion of the outer peripheral surface of the roller that is in contact with the backup roller has an outer peripheral layer harder than the outer peripheral portion of the backup roller.

Here, the "hard outer peripheral layer" in "having an outer peripheral layer harder than the outer peripheral portion of the backup roller" means the relationship of the surface properties of the conveying roller which is less likely to be worn at the contact portion between the conveying roller and the backup roller.

A printing apparatus according to a second aspect of the present invention is characterized in that, in the first aspect, a portion of the transport roller that is in contact with the back-up roller is smaller than a portion of the conveying roller that is not in contact with the back-up roller but is in contact with the medium. The outer peripheral surface is formed to be recessed.

A printing apparatus according to a third aspect of the present invention is characterized in that, in the second aspect, a portion of the conveying roller that is not in contact with the backup roller but is in contact with the medium is provided with a portion that is in contact with the medium to provide conveyance Force transmission layer.

The printing device according to the fourth aspect of the present invention is characterized in that, in any one of the first aspect to the third aspect, the outer peripheral layer is provided on the groove portion formed on the outer peripheral surface of the base material of the conveying roller, The outer peripheral surface formed by the outer peripheral layer is flush with the outer peripheral surface of the base material.

The printing device according to the fifth aspect of the present invention is characterized in that, in any one of the first to fourth aspects, the base material of the conveying roller is free-cutting steel, and the outer peripheral layer is alloy tool steel.

A printing apparatus according to a sixth aspect of the present invention, in any one of the first to fifth aspects, includes a pressing roller for pressing the medium to the conveying roller.

The printing apparatus according to a seventh aspect of the present invention is characterized in that in any one of the first to sixth aspects, both end portions of the conveying roller that are not opposed to the medium are rotatably supported by bearings, so The backup roller is located in the area between the bearings at the two ends.

An eighth aspect of the present invention is characterized in that it is a method of manufacturing a conveying roller for a printing apparatus including: a conveying roller conveying a medium; and supporting the conveying from a side opposite to the medium. A back-up roll of a roller, in the method for manufacturing a conveyance roller, includes a first step of providing an outer peripheral layer harder than an outer peripheral portion of the back-up roller on a portion of the outer peripheral surface of the conveyance roller that is in contact with the back-up roller process.

According to this aspect, the conveyance roller according to the first aspect can be easily manufactured.

According to a ninth aspect of the present invention, in the eighth aspect, a second step is provided after the first step, and the second step is performed in a manner that is not related to the transport roller. A step of providing a conveying action layer that contacts the medium and provides a conveying force on the outer peripheral surface of the base material of the conveying roller at the portion where the backup roller is in contact with the medium.

According to this aspect, the conveyance roller according to the third aspect can be easily manufactured.

According to a tenth aspect of the present invention, the method for manufacturing a conveying roller, in the eighth or ninth aspect, includes a groove portion forming step of forming a groove portion on an outer peripheral surface of a base material of the conveying roller. ; the first step of providing the outer peripheral layer in the groove portion; and the grinding step of making the outer peripheral surface formed by the outer peripheral layer flush with the outer peripheral surface of the base material.

According to this aspect, the transport roller according to the fourth aspect can be easily manufactured.

Hereinafter, referring to the accompanying drawings, the printing apparatus and the manufacturing method of the conveying roller of the present invention will be described in detail by taking the six embodiments of the first embodiment to the sixth embodiment as examples.

It should be noted that, in the following description, first, the printing device is selected as the first embodiment of the present invention, and the general structure of the printing device and the specific structure around the conveying roller as the characteristic structure of the printing device are described. Explain, and describe its function and effect.

Then, the printing devices are similarly selected as the second and third embodiments of the present invention, and the structures around the conveying rollers of each printing device will be described in detail around the differences from the first embodiment, and their functions and effects will be described in detail. describe.

Next, the manufacturing method of a conveyance roller is selected as Embodiment 4 of the present invention, and the content of the manufacturing method of this conveyance roller is divided into each process, and is demonstrated concretely, and its action and effect are described.

Next, similarly select the manufacturing method of the conveying roller as Embodiment 5 and Embodiment 6 of the present invention, divide the content of the manufacturing method of the conveying roller of each embodiment into each step, and focus on the difference from Embodiment 4. Specifically, their functions and effects are described.

Finally, another embodiment of the printing apparatus and the manufacturing method of the conveyance roller of the present invention whose partial configuration is different from those of the six embodiments will be briefly described.

Embodiment 1

(1) Schematic overall configuration of the printing apparatus (refer to FIGS. 1 and 2 )

The printing apparatus 1 according to the first embodiment of the present invention includes a conveyance roller 3 that conveys the medium P, and a backup roller 11 that supports the conveyance roller 3 from the side opposite to the medium P.

In addition, the portion 7 of the outer peripheral surface 5 of the conveyance roller 3 that is in contact with the backup roller 11 has an outer peripheral layer 15 that is harder than the outer peripheral portion 13 of the backup roller 11 .

Specifically, the printing apparatus 1 of the present embodiment is a target of a large-scale inkjet printer having a medium P which is long in the width direction B for printing a medium P that is large in the conveyance direction A and the width direction B. transfer roller 3.

In addition, in this printing apparatus 1, in order to prevent the intermediate portion of the conveying roller 3 that is installed between the left and right frames 4L and 4R of the printer main body 2 from being bent downward, a conveying roller 3 that supports the conveying from below as an intermediate support is provided in the intermediate portion. The support member 17 of the roller 3 .

In the first embodiment, three sets (17L, 17M, 17R) of support members 17 are provided at appropriate intervals in the width direction B. As shown in FIG. Each of the support members 17L, 17M, and 17R includes two support rollers 11A and 11B ( FIG. 2 ) formed of high-hardness metal bearings such as STKM11A, which directly contact and rotate with the outer peripheral surface 5 of the conveyance roller 3A, and two support rollers 11A and 11B ( FIG. 2 ). These two support rollers 11A and 11B are supported by a rotatable support base 19 .

Further, above the conveyance roller 3A, a pressing roller 21 for pressing the medium P toward the conveyance roller 3A through the medium P is provided. A plurality of pressing rollers 21 are provided in series along the width direction B so that a pressing force can be uniformly applied in the width direction B. As shown in FIG.

In addition, both end parts of the conveyance roller 3A which are not opposed to the medium P are rotatably supported, for example, by bearings 23L and 23R attached to the left and right frames 4L and 4R. The three sets of six backup rolls 11 provided in groups of two are arranged in the area between the bearings 23L and 23R at both ends of the conveying roll 3A at appropriate intervals in the width direction B as described above. , that is, the middle part.

Moreover, the print head 25 is arrange|positioned in the downstream position of the conveyance direction A of the conveyance roller 3A. It should be noted that the print head 25 may be a so-called serial head or a so-called line head, and the serial head is mounted on the carriage 27 and guided by a guide 29 extending in the width direction B, The reciprocating movement is performed in the width direction B, and the line head performs printing of the entire width direction B at one time at a predetermined conveying pitch.

(2) The specific structure of the periphery of the conveying roller and its function and effect (refer to FIGS. 3 to 5 )

Next, a specific configuration around the conveyance roller 3A, which is a characteristic configuration of the first embodiment, and its function and effect will be described.

The conveying roller 3A itself is a shaft-shaped member, and as an example, a groove 31 and a hole 33 for the purpose of marking and cooperating with other members are formed on the peripheral surface, and a substantially circle long in the width direction B is formed. The rod-shaped shaft portion main body 35 is provided at the center thereof as a base material. Further, the shaft portion main body 35 is made of free-cutting steel that is easily cut by an NC lathe or the like. In addition, materials with low hardness, such as STKM material, SUM material, or SUS material, are used as free-cutting steel.

In addition, on the surface of the shaft portion main body 35 , in order to prevent corrosion of the shaft portion main body 35 , a plating layer 37 having a thickness of, for example, 3 to 5 μm is formed ( FIG. 5 ). In addition, when forming the plating layer 37, rather than using the hard chrome plating etc. which require a large-scale facility, comparatively inexpensive nickel plating, zinc plating, etc. are used.

Moreover, as mentioned above, the outer peripheral layer 15 which is harder than the outer peripheral part 13 of the backup roller 11 is formed in the part 7 of the conveyance roller 3A which contact|connects the backup roller 11. Further, as an example, the outer peripheral layer 15 is formed of an alloy tool steel material to which hard powders such as SDK and TiC are adhered by irradiating the surface of the shaft portion main body 35 with a laser and welding.

Further, the portion 7 of the conveying roller 3A that is in contact with the backup roller 11 is recessed from the outer peripheral surface 5 formed by the portion 9 that is not in contact with the backup roller 11 but is in contact with the medium P. Further, as described above, the portion 7 of the conveying roller 3A that is in contact with the backup roller 11 is formed by the outer peripheral layer 15 that is harder than the outer peripheral portion 13 of the backup roller 11 .

On the other hand, the conveying action layer 39 which is in contact with the medium P and provides a conveying force is provided in the portion 9 of the conveying roller 3A which is not in contact with the backup roller 11 but is in contact with the medium P. In addition, as the conveyance action layer 39, the well-known precision roughening coating which provides the friction force required for conveying the medium P is applied to the outer peripheral surface 5 of the conveyance roller 3A, for example.

Regarding the dimension of the outer diameter D of each portion of the conveyance roller 3A thus configured, when the outer diameter when the plating layer 37 is formed on the shaft portion main body 35 is defined as D1, the outer diameter of the shaft portion main body 35 before the plating layer 37 is formed D0 is D0 = D1 - 2t minus the thickness t of the plating layer 37 . Further, the outer diameter D2 of the portion 7 of the conveying roller 3A in contact with the backup roller 11 is D2=D0+2u which is the outer diameter D0 of the shaft portion main body 35 plus the thickness u of the outer peripheral layer 15 .

Further, the outer diameter D3 of the portion 9 of the transport roller 3A in contact with the medium P is D3=D1+2v obtained by adding the outer diameter D1 when the plating layer 37 is formed on the shaft portion main body 35 and the thickness v of the transport action layer 39 . Further, the relationship between the outer diameter D3 of the portion 9 of the conveying roller 3A in contact with the medium P and the outer diameter D2 of the portion 7 of the conveying roller 3A that is in contact with the backup roller 11 is D3>D2.

With the printing apparatus 1A of the first embodiment configured in this way, the hardness of the portion 7 of the conveying roller 3A in contact with the backup roller 11 is improved, and the durability of the conveying roller 3A can be improved. In addition, the outer peripheral layer 15 is formed on the portion 7 of the conveying roller 3 in contact with the backup roller 11 by relatively inexpensive laser processing without using a process such as hard chrome plating that requires large equipment, thereby reducing the manufacturing cost of the conveying roller 3A.

Therefore, by using the conveyance roller 3A having such high durability and being inexpensively manufactured, the performance of conveying the medium P stably over a long period of time can be exhibited, and the printing apparatus 1A which contributes to the reduction of the running cost can be provided at a low cost.

Embodiment 2 (refer to FIG. 6 )

Next, the printing apparatus 1B according to the second embodiment of the present invention will be described. In the printing apparatus 1B of the second embodiment, the configuration of the transport roller 3B is only partially different from that of the transport roller 3A of the printing apparatus 1A of the first embodiment, and the other configuration is the same as that of the first embodiment.

Therefore, the description of the same configuration as that of the first embodiment is omitted here, and the configuration of the conveying roller 3B in the printing apparatus 1B according to the second embodiment, which is different from the first embodiment, will be described, and the functions and effects thereof will be described. .

As shown in FIG. 6 , in the printing apparatus 1B according to the second embodiment, the shaft portion main body 35 of the conveying roller 3B is formed with grooves 31 and holes 33 for the purpose of the above marks and functions, and is connected with the backup roller. A groove portion 41 having a predetermined depth E is also formed in the portion 7 that is in contact with the portion 11 .

Moreover, the outer peripheral layer 15 which is harder than the outer peripheral part 13 of the backup roll 11 is formed so that the groove part 41 may be filled. In addition, the outer peripheral surface formed by the outer peripheral layer 15 is formed flush with the outer peripheral surface of the shaft portion main body 35 serving as the base material.

Regarding the dimension of the outer diameter D of each portion of the conveyance roller 3B configured in this way, when the outer diameter when the plating layer 37 is formed on the shaft portion main body 35 is defined as D1, the outer diameter of the shaft portion main body 35 before the plating layer 37 is formed D0 is D0 = D1 - 2t minus the thickness t of the plating layer 37 . The outer diameter D2 of the portion 7 of the conveying roller 3B in contact with the backup roller 11 is the outer diameter D4 of the groove portion 41 of the shaft portion main body 35 plus the thickness u of the outer peripheral layer 15 D2 = D4 + 2u, which is D2 = D0 .

The outer diameter D3 of the portion 9 of the transport roller 3B in contact with the medium P is the outer diameter D1 when the plating layer 37 is formed on the shaft body 35 plus the thickness v of the transport action layer 39 D3=D1+2v. In addition, the relationship between the outer diameter D3 of the portion 9 of the transport roller 3B in contact with the medium P and the outer diameter D2 of the portion 7 of the transport roller 3B in contact with the backup roller 11 is the same as in the first embodiment, D3>D2.

The printing apparatus 1B of the second embodiment configured in this way can also exhibit the same functions and effects as the printing apparatus 1A according to the first embodiment, and the durability of the transport roller 3B can be improved and the manufacturing cost can be reduced. The printing apparatus 1B that exhibits the performance of conveying the medium P stably.

Embodiment 3 (refer to FIG. 7 )

Next, the printing apparatus 1C of Embodiment 3 which concerns on this invention is demonstrated. In the printing apparatus 1C of the third embodiment, the configuration of the conveying roller 3C is only partially different from that of the conveying roller 3B of the printing apparatus 1B of the second embodiment, and the other configurations are the same as those of the first and second embodiments.

Therefore, the description of the same configuration as the first and second embodiments is omitted here, and the configuration of the transport roller 3C in the printing apparatus 1C according to the third embodiment, which is different from the first and second embodiments, will be described. And describe its function and effect.

In the printing apparatus 1C of the third embodiment, as in the second embodiment, as shown in FIG. 7 , the shaft portion main body 35 of the conveying roller 3C is formed with the groove 31 and the hole 33 for the purpose of the marks and functions described above. In addition, a groove portion 41 having a predetermined depth E is formed in the portion 7 in contact with the backup roll 11 .

Further, in the groove portion 41 , the plating layer 37 is formed on the bottom side, and the outer peripheral layer 15 harder than the outer peripheral portion 13 of the backup roll 11 is formed on the surface side of the plating layer 37 . In addition, as in the second embodiment, the outer peripheral surface formed by the outer peripheral layer 15 is formed flush with the outer peripheral surface of the shaft portion main body 35 serving as the base material.

It should be noted that, here, the depth E of the groove portion 41 of the third embodiment is set to be the same as the depth E of the groove portion 41 of the second embodiment, the thickness t of the plating layer 37 and the thickness u of the outer peripheral layer 15 . Accordingly, the outer peripheral layer 15 protrudes from the outer peripheral surface of the shaft portion main body 35 . In addition, a plating layer 37 having a thickness t is also formed on the outer peripheral surface of the shaft portion main body 35 .

Regarding the dimension of the outer diameter D of each portion of the conveyance roller 3C configured in this way, when the outer diameter when the plating layer 37 is formed on the shaft portion main body 35 is defined as D1, the outer diameter of the shaft portion main body 35 before the plating layer 37 is formed D0 is D0 = D1 - 2t minus the thickness t of the plating layer 37 . The outer diameter D2 of the portion 7 of the conveying roller 3C in contact with the backup roller 11 is the outer diameter D4 of the groove portion 41 of the shaft portion main body 35 plus the thickness t of the plating layer 37 and the thickness u of the outer peripheral layer 15 D2 = D4 + 2t +2u, and as an example, set D2>D1.

In addition, as in the second embodiment, the outer diameter D3 of the portion 9 of the transport roller 3C that is in contact with the medium P is the outer diameter D1 when the plating layer 37 is formed on the shaft portion main body 35 plus D3 of the thickness v of the transport action layer 39 =D1+2v. In addition, the relationship between the outer diameter D3 of the portion 9 of the conveying roller 3C in contact with the medium P and the outer diameter D2 of the portion 7 of the conveying roller 3C that is in contact with the backup roller 11 is the same as in the first and second embodiments, D3>D2 .

In addition, the printing apparatus 1C according to the third embodiment configured in this way can also exhibit the same functions and effects as the printing apparatus 1A according to the first embodiment and the printing apparatus 1B according to the second embodiment. Therefore, it is possible to provide a printing apparatus 1C capable of stably conveying the medium P over a long period of time.

Embodiment 4 (refer to FIGS. 8 to 14 )

Next, the manufacturing method of the conveyance roller of Embodiment 4 which concerns on this invention is demonstrated. The manufacturing method of the conveyance roller of this Embodiment 4 is a method of manufacturing the conveyance roller 3A used for the printing apparatus 1A of Embodiment 1 shown in FIG.

The manufacturing method of the conveyance roller according to the present embodiment is a method of manufacturing the conveyance roller 3 used in the printing apparatus 1 including the conveyance roller 3 that conveys the medium P, and the conveyance roller 3 that supports the conveyance roller 3 from the side opposite to the medium P. The backup roll 11 has an outer peripheral layer forming step Q3 ( FIG. 10 ) in the manufacturing method of the transport roll 3 as an outer peripheral layer 15 harder than the outer peripheral portion 13 of the backup roll 11 is provided on the outer peripheral surface 5 of the transport roll 3 and the backup roll 3 is formed. The first process of the portion 7 where the roller 11 contacts.

Further, after the outer peripheral layer forming step Q3 as the first step, a coating step Q7 ( FIG. 14 ) is provided to provide contact with the medium P on the outer peripheral surface of the shaft portion main body 35 serving as the base material of the conveying roller 3 The second step of the transport action layer 39 for transporting force, the transport action layer 39 being the portion 9 of the transport roller 3 that is not in contact with the backup roller 11 but is in contact with the medium P.

Furthermore, in the fourth embodiment, in addition to the two steps of the outer peripheral layer forming step Q3 and the coating step Q7, the shaft portion forming step Q1 ( FIG. 8 ), the shaft portion grinding step Q2 ( FIG. 9 ), and the outer peripheral portion forming step Q1 ( FIG. 8 ) are included. There are five steps: layer polishing step Q4 ( FIG. 11 ), masking step Q5 ( FIG. 12 ), and plating layer forming step Q6 ( FIG. 13 ). Hereinafter, these steps will be specifically described in accordance with the flow of manufacture of the conveyance roller 3A.

(1) Shaft forming step (refer to FIG. 8 )

The shaft portion forming step Q1 is a step of processing the raw material W to form a shaft portion blank 43 that is one turn larger than the shaft portion main body 35 after the shaft portion grinding step Q2 in the next step.

In this step, the outer shape of the shaft portion blank 43 is modified by cutting using an NC lathe or the like to have a predetermined shape, and grooves 31 and holes 33 for symbols and functions are formed.

(2) Shaft grinding step (refer to FIG. 9 )

The shaft portion grinding step Q2 is a step of processing the shaft portion blank 43 formed in the shaft portion forming step Q1 to obtain the shaft portion main body 35 having a predetermined outer diameter D0.

In this step, as an example, the entire axial direction of the shaft portion blank 43 is ground by centerless grinding, and the shaft portion main body 35 having a small diameter corresponding to the thickness t of the plating layer 37 is processed.

(3) Outer peripheral layer forming step (refer to FIG. 10 )

The outer peripheral layer forming step Q3 is a step of forming the outer peripheral layer 15 harder than the outer peripheral portion 13 of the backup roller 11 in the portion of the shaft portion main body 35 that is in contact with the backup roller 11 .

In this step, as an example, the outer peripheral layer 15 is formed by build-up welding of hard powders such as SKD and TiC using a fiber laser welding apparatus used for repair of a mold or the like. Alternatively, the outer peripheral layer 15 may be formed by moving the shaft portion main body 35 to a high-temperature sintering furnace or the like and subjecting the hard powder to heat treatment.

(4) Outer peripheral layer polishing step (refer to FIG. 11 )

The outer peripheral layer polishing step Q4 is a step of processing the surface of the outer peripheral layer 15 formed in the outer peripheral layer forming step Q3 into the outer peripheral layer 15 having a predetermined outer diameter D2.

In this step, for example, cylindrical grinding is preferably used, and the surfaces of the outer peripheral layer 15 protruding outward by the thickness u from the outer peripheral surface of the shaft portion main body 35 are simultaneously processed while securing the shaft center. In addition, in this process, in order to process the outer peripheral layer 15 of high hardness, the grindstone etc. which are suitable for this grinding|polishing process are selected.

(5) Masking step (refer to FIG. 12 )

The masking step Q5 is a step of masking the outer peripheral layer 15 whose surface has been processed in the outer peripheral layer polishing step Q4 with a masking tape 45 or the like.

In this step, the masking tape 45 or the like is attached and covered on the surface of the outer peripheral layer 15 so that the plating layer does not adhere to the surface of the outer peripheral layer 15 after polishing in the plating layer forming step Q6 in the next step.

(6) Plating layer forming step (refer to FIG. 13 )

The plating layer forming step Q6 is a step of forming the plating layer 37 on the surface of the shaft portion main body 35 where the outer peripheral layer 15 is shielded by the shielding step Q5 by a plating process.

In this step, the plating layer 37 is formed on the surface of the shaft portion main body 35 mainly for the purpose of suppressing corrosion of the shaft portion main body 35 by a relatively inexpensive plating process. In addition, by peeling off the masking tape 45 after a plating process, the surface of the outer peripheral layer 15 is maintained in the state after grinding|polishing by the outer peripheral part grinding|polishing process Q4.

(7) Painting process (refer to FIG. 14 )

The coating step Q7 is a step of coating the surface of the shaft portion main body 35 having the plating layer 37 formed on the surface thereof in the plating layer forming step Q6 to form the transport action layer 39 having a predetermined thickness v.

In this step, for example, known fine roughening coating is performed, and the transport action layer 39 is formed only on the surface of the plating layer 37 attached to the outer peripheral surface of the shaft portion main body 35 excluding the grooves 31 and the holes 33 .

Then, according to the manufacturing method of the conveyance roller of this Embodiment 4 comprised in this way, the conveyance roller 3A which has high durability used in the printing apparatus 1A of Embodiment 1 can be manufactured efficiently and inexpensively.

In addition, the transport roller 3A manufactured in this way can exhibit the performance of stably transporting the medium P over a long period of time, and thus can contribute to the reduction of running costs.

Embodiment 5 (refer to FIGS. 15 to 20 )

Next, the manufacturing method of the conveyance roller of Embodiment 5 which concerns on this invention is demonstrated. The manufacturing method of the conveyance roller of this Embodiment 5 is a method of manufacturing the conveyance roller 3B used for the printing apparatus 1B which concerns on Embodiment 2 shown in FIG.

That is, in the fifth embodiment, the shaft portion/groove portion forming step R1 ( FIG. 15 ) includes the groove portion forming in which the groove portion 41 is formed on the outer peripheral surface of the shaft portion main body 35 serving as the base material of the conveying roller 3 . The step includes a first step of providing the outer peripheral layer 15 in the groove portion 41 in the outer peripheral layer forming step R2 ( FIG. 16 ). Further, in the shaft portion/outer peripheral layer polishing step R3 ( FIG. 17 ), there is a polishing step of making the outer peripheral surface formed by the outer peripheral layer 15 flush with the outer peripheral surface of the shaft portion main body 35 serving as the base material.

Furthermore, in the fifth embodiment, in addition to the three steps of the shaft portion/groove portion forming step R1, the outer peripheral layer forming step R2, and the shaft portion/outer peripheral layer polishing step R3, a masking step R4 ( FIG. 18 ) is included. , the three steps of the plating layer forming step R5 ( FIG. 19 ) and the coating step R6 ( FIG. 20 ). Hereinafter, these six steps will be specifically described in accordance with the manufacturing flow of the conveying roller 3B.

(1) Shaft portion/groove portion forming step (refer to FIG. 15 )

The shaft portion/groove portion forming step R1 is a step of processing the raw material W to form a shaft portion blank 43 that is one turn larger than the shaft portion main body 35 after the shaft portion/outer peripheral layer grinding step R3 described later, The recessed portion 41 is formed at a predetermined position of the shaft portion blank 43 .

In this step, the outer shape of the shaft portion blank 43 is modified by cutting processing using an NC lathe or the like to obtain a predetermined shape, and in addition to forming grooves 31 and holes 33 for marking and function purposes, and The portion 7 that the backup roller 11 contacts forms a groove portion 41 for providing the outer peripheral layer 15 .

(2) Outer peripheral layer forming step (refer to FIG. 16 )

The outer peripheral layer forming step R2 is a step of forming the outer peripheral layer 15 harder than the outer peripheral portion 13 of the backup roller 11 in the groove portion 41 formed in the portion of the shaft portion main body 35 in contact with the backup roller 11 .

In this step, as in the outer peripheral layer forming step Q3 of the fourth embodiment, the outer peripheral layer 15 is formed by depositing hard powder onto the groove portion 41 of the shaft portion main body 35 before grinding, for example, using a fiber laser welding apparatus.

In addition, in this step, the thickness u of the outer peripheral layer 15 is adjusted so that there is no difference in height between the surface of the outer peripheral layer 15 and the outer peripheral surface of the shaft portion blank 43 in the next step. This is because if the thickness u of the outer peripheral layer 15 is small, polishing of the surface of the outer peripheral layer 15 may not be performed in the next step, and if the thickness u of the outer peripheral layer 15 is large, the outer peripheral layer 15 may remain in the next step. The protruding part causes a height difference.

(3) Shaft/Outer Peripheral Layer Grinding Step (refer to FIG. 17 )

The shaft portion/outer peripheral layer grinding step R3 is a step of processing the outer peripheral surface of the shaft portion blank 43 formed in the shaft portion/groove portion forming step R1 to obtain the shaft portion main body 35 having a predetermined outer diameter D0, and At the same time, the surface of the outer peripheral layer 15 formed in the outer peripheral layer forming step R2 is processed to form the outer peripheral layer 15 having a predetermined outer diameter D2 at a time.

In this step, the outer peripheral surface of the shaft portion blank 43 and the outer peripheral surface of the outer layer portion 15 are entirely ground in the axial direction by, for example, centerless grinding. Therefore, the outer diameter D0 of the shaft portion main body 35 and the outer diameter D2 of the outer peripheral layer 15 must be D0=D2. In addition, in this process, when performing centerless grinding, selection of lateral feed and through feed is performed. When the shaft portion main body 35 is an elongated shaft, through feed is selected, and when a grinding process like cylindrical grinding is to be performed, lateral feed is selected. In addition, also in this process, in order to perform grinding|polishing process of the outer peripheral layer 15 with high hardness, an appropriate grindstone etc. are selected.

(4) Masking step (refer to FIG. 18 )

The masking step R4 is a step of masking the outer peripheral layer 15 whose surface has been processed in the shaft portion/peripheral layer polishing step R3 with the masking tape 45 or the like similarly to the masking step Q5 in the fourth embodiment.

In this step, the masking tape 45 or the like is attached and covered on the surface of the outer peripheral layer 15 so that the plating layer does not adhere to the surface of the outer peripheral layer 15 after polishing in the plating layer forming step R5 in the next step.

(5) Plating layer forming step (refer to FIG. 19 )

The plating layer forming step R5 is a step of forming the plating layer 37 by plating the surface of the shaft portion main body 35 masked by the outer peripheral layer 15 in the masking step R4 as in the plating layer forming step Q6 in the fourth embodiment.

In this step, the plating layer 37 is formed on the surface of the shaft portion main body 35 mainly for the purpose of suppressing corrosion of the shaft portion main body 35 by a relatively inexpensive plating process. In addition, by peeling off the masking tape 45 after a plating process, the surface of the outer peripheral layer 15 maintains the state after the grinding|polishing process by the shaft part / outer peripheral layer grinding|polishing process R3.

(6) Painting process (refer to FIG. 20 )

The coating step R6 is to coat the surface of the shaft portion main body 35 having the plating layer 37 formed on the surface in the plating layer forming step R5 in the same manner as the coating step Q7 in the fourth embodiment to form the transport action layer 39 of the predetermined thickness v. process.

In this step, for example, known fine roughening coating is performed, and the transport action layer 39 is formed only on the surface of the plating layer 37 attached to the outer peripheral surface of the shaft main body 35 excluding the grooves 31 , the holes 33 and the outer peripheral layer 15 .

Therefore, the manufacturing method of the conveying roller according to the fifth embodiment configured in this way can also exhibit the same functions and effects as those of the fourth embodiment, and the printing apparatus 1B according to the second embodiment can be manufactured with high efficiency and low cost. High durability transfer roller 3B.

In addition, the thus-produced transport roller 3B can exhibit the performance of stably transporting the medium P over a long period of time, and thus can contribute to reduction in running costs. Furthermore, in the fifth embodiment, the grinding of the shaft portion blank 43 and the outer peripheral layer 15 is performed at one time in the same step, and thus one step is less than that in the fourth embodiment. Therefore, the conveyance roller 3B can be manufactured more efficiently.

Embodiment 6 (refer to FIGS. 21 to 26 )

Next, the manufacturing method of the conveyance roller of Embodiment 6 which concerns on this invention is demonstrated. The manufacturing method of the conveyance roller of the sixth embodiment is a method of manufacturing the conveyance roller 3C employed in the printing apparatus 1C according to the third embodiment shown in FIG. 7 .

That is, in the sixth embodiment, there are six shaft portion/groove portion forming step S1, shaft portion grinding step S2, plating layer forming step S3, outer peripheral layer forming step S4, outer peripheral layer grinding step S5, and coating step S6. process. Hereinafter, these six steps will be specifically described in accordance with the manufacturing flow of the conveying roller 3C.

(1) Shaft portion/groove portion forming step (refer to FIG. 21 )

The shaft portion/groove portion forming step S1 is a step of processing the raw material W in the same manner as in the fifth embodiment to form a shaft that is one turn larger than the shaft portion main body 35 after the shaft portion grinding step S2 in the next step. A portion blank 43 is formed, and a groove portion 41 is formed at a predetermined position of the shaft portion blank 43 .

In this step, the outer shape of the shaft portion blank 43 is modified by cutting processing using an NC lathe or the like to obtain a predetermined shape, and in addition to forming grooves 31 and holes 33 for marking and function purposes, and The portion 7 that the backup roller 11 contacts forms a groove portion 41 for providing the outer peripheral layer 15 .

(2) Shaft grinding step (refer to Fig. 22)

The shaft portion grinding step S2 is a step of processing the outer peripheral surface of the shaft portion blank 43 formed in the shaft portion/groove portion forming step S1 to obtain the shaft portion main body 35 having a predetermined outer diameter D0.

In this step, for example, centerless grinding is used to grind the entire axial direction of the shaft portion blank 43 to form the shaft portion main body 35 having a small diameter corresponding to the thickness t of the plating layer 37 . In addition, in this step, in order to secure the shaft center in the outer peripheral layer grinding step S5 to be described later, a transverse feed capable of processing similar to cylindrical grinding is selected, and the outer diameter of the shaft portion blank 43 is clamped.

(3) Plating layer forming step (refer to FIG. 23 )

The plating layer forming step S3 is a step of forming the plating layer 37 on the surface of the shaft portion main body 35 by the plating process as in the plating layer forming step Q6 in the fourth embodiment.

In this step, the plating layer 37 is formed on the surface of the shaft portion main body 35 mainly for the purpose of suppressing corrosion of the shaft portion main body 35 by a relatively inexpensive plating process.

(4) Outer peripheral layer forming step S4 (see FIG. 24 )

The outer peripheral layer forming step S4 is a step of forming the outer peripheral layer 15 harder than the outer peripheral portion 13 of the backup roller 11 in the groove portion 41 formed in the portion of the shaft portion main body 35 in contact with the backup roller 11 .

In this step, as in the outer peripheral layer forming step Q3 of the fourth embodiment, the outer peripheral layer 15 is formed by depositing hard powder on the groove portion 41 of the shaft portion main body 35 on which the plating layer 37 is formed, for example, using a fiber laser welding apparatus. In addition, when the outer peripheral layer 15 is built-up on the surface of the plating layer 37, in order to avoid insufficient bonding between the two, the type and combination of plating and hard powder to be used are adjusted, or the surface of the plating layer 37 is roughened as necessary. preprocessing, etc.

(5) Outer peripheral layer polishing step (refer to FIG. 25 )

The outer peripheral layer polishing step S5 is a step of processing the surface of the outer peripheral layer 15 formed in the outer peripheral layer forming step S4 into the outer peripheral layer 15 having a predetermined outer diameter D2.

In this step, for example, cylindrical grinding is preferably used, and the surfaces of the outer peripheral layer 15 are simultaneously processed at a plurality of places protruding outward from the outer peripheral surface of the plating layer 37 formed on the outer peripheral surface of the shaft portion main body 35 while securing the shaft center. . In addition, in this process, in order to process the outer peripheral layer 15 of high hardness, the grindstone etc. which are suitable for this grinding|polishing process are selected.

(6) Painting process (refer to FIG. 26 )

The coating step S6 is a conveyance for forming a predetermined thickness v by coating the surface of the shaft portion main body 35 having the plating layer 37 formed on the surface in the plating layer forming step S3 as in the coating step Q7 ( FIG. 4 ) in the fourth embodiment. Process of working layer 39 .

In this step, for example, a well-known precision roughening coating is performed and formed only on the surface of the plating layer 37 attached to the outer peripheral surface of the shaft portion main body 35 excluding the plating layer 37 attached to the groove 31 and the hole 33 and the outer peripheral layer 15 . Transport layer 39 .

Therefore, the manufacturing method of the conveying roller according to the sixth embodiment configured in this way can exhibit the same functions and effects as those of the fourth embodiment, and can efficiently and inexpensively manufacture the printing apparatus 1C according to the third embodiment. High durability transfer roller 3C.

In addition, the transport roller 3C manufactured in this way can exhibit the performance of stably transporting the medium P over a long period of time, and thus can contribute to the reduction of running costs. Furthermore, in the sixth embodiment, the masking step is omitted, so that one step is less than that in the fourth embodiment. Therefore, the conveyance roller 3C can be manufactured more efficiently.

Other implementations

The printing apparatus 1 and the manufacturing method of the conveying roller according to the present invention are based on the above-described structures, but it goes without saying that changes in some of the structures may be made without departing from the gist of the present invention. , omitted, etc.

For example, the printing apparatus 1 of the present invention is not limited to the large-scale inkjet printers described in the above-described embodiments, and can be applied to a problem in which deflection (regardless of degree difference) in the intermediate portion of the conveying roller 3 is a problem Various printing devices.

In addition, the role of the plating layer 37 of the conveying roller 3 is to improve the hardness of the shaft portion main body 35 as a base material and inhibit corrosion, but in the present invention, sufficient hardness is provided by providing the outer peripheral layer 15, therefore, It is also possible to omit the plating layer 37 and provide it by primer coating or the like.

In addition, the coating performed in order to impart a predetermined conveyance force to the conveyance roller 3 may be performed by spraying the paint with an air gun or the like. However, in this case, in order to prevent paint from entering the grooves 31, holes 33, grooves 41 and the like formed in the shaft portion main body 35, it is preferable to perform a process such as filling or masking them with a filler.

In addition, when a material with relatively strong corrosion resistance such as SUS material is selected as the material of the shaft portion main body 35 , the formation of the plating layer 37 may be omitted.

Claims (10)

1. A printing apparatus is characterized by comprising:

a transfer roller that transfers the medium; and

a supporting roller supporting the conveying roller from a side opposite to the medium,

the outer peripheral surface of the transport roller has an outer peripheral layer harder than the outer peripheral portion of the backup roller.

2. Printing device according to claim 1,

the outer peripheral surface of the conveying roller in contact with the backup roller is recessed from the outer peripheral surface of the conveying roller in contact with the medium without being in contact with the backup roller.

3. Printing device according to claim 2,

a portion of the transport roller, which is not in contact with the backup roller but in contact with the medium, is provided with a transport action layer that is in contact with the medium to provide a transport force.

4. Printing device according to claim 1,

the outer peripheral layer is arranged in a groove portion formed in the outer peripheral surface of the base material of the conveying roller, and the outer peripheral surface formed by the outer peripheral layer is flush with the outer peripheral surface of the base material.

5. Printing device according to claim 2,

the outer peripheral layer is arranged in a groove portion formed in the outer peripheral surface of the base material of the conveying roller, and the outer peripheral surface formed by the outer peripheral layer is flush with the outer peripheral surface of the base material.

6. A printing device according to claim 3,

the outer peripheral layer is arranged in a groove portion formed in the outer peripheral surface of the base material of the conveying roller, and the outer peripheral surface formed by the outer peripheral layer is flush with the outer peripheral surface of the base material.

7. Printing device according to claim 1,

the base material of the transfer roll is free-cutting steel,

the outer peripheral layer is made of alloy tool steel.

8. Printing device according to claim 2,

the base material of the transfer roll is free-cutting steel,

the outer peripheral layer is made of alloy tool steel.

9. Printing device according to claim 1,

the printing device includes a pressing roller for pressing the medium against the conveying roller.

10. Printing device according to claim 1,

both end portions of the conveying roller not opposed to the medium are rotatably supported by bearings,

the support roller is located in an area between the bearings at both ends in the transfer roller.

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