JP2007284154A - Manufacturing method for conveying roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a conveying roller capable of accomplishing reduction of manufacturing cost. <P>SOLUTION: In the manufacturing method for the conveying roller for manufacturing the conveying roller 1 in which first and second star wheels 5, 6 having the approximately same outer diameter are provided concentrically relative to a roller body 4, a first molded product 13 in which a first portion 12 of the roller body 4 is provided over front and back surfaces of the first star wheel 5 is molded by first insert molding, and a second portion 15 of the roller body 4 provided over front and back surfaces of the second star wheel 6 is integrated relative to the first molded product by second insertion molding to form a second molded product 16. Further, in the roller body 4 constituting the second molded product 16, the roller body 4 is formed such that a diameter of a portion 17 clamped by the two star wheels 5, 6 becomes larger than diameters of the portions 18, 19 positioned at the outer side of the two star wheels 5, 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a conveyance roller suitable for use as a paper feed roller for a copying machine, a printer, or the like.

  Conventionally, copiers, printers, and the like are provided with a transport roller as a paper feed roller (paper discharge roller), and a plurality of transport rollers are provided on a single rod that rotates about an axis. Each transport roller is provided with one star wheel concentrically, and paper is transported by the rotation of the star wheel.

  Incidentally, in recent years, miniaturization of copiers, printers, and the like has progressed, and accordingly, the transport rollers have also been miniaturized. However, the downsizing of the conveying roller works in the direction of lowering the paper feeding performance, and therefore, to compensate for this, two star wheels are provided on one conveying roller.

  However, in order to manufacture a transport roller having the two star wheels, a mold that slides up and down and a mold that slides left and right must be used, and a large number (for example, about 100) of transport rollers must be used. There was a problem that the roller could not be formed at a time, and its manufacturing cost remained high.

  The present invention has been made in consideration of the above-described matters, and an object thereof is to provide a method for manufacturing a transport roller capable of reducing the manufacturing cost.

  In order to achieve the above object, a method of manufacturing a transport roller according to the present invention manufactures a transport roller in which first and second star wheels having substantially the same outer diameter are provided concentrically with a roller body. It is a manufacturing method of a conveyance roller, and forms the 1st molding in which the 1st part of the roller body was provided over the front and back of the 1st star wheel by the first insert molding, In the first molded body, the second molded body is formed by integrating the second portion of the roller body provided over the front and back surfaces of the second star wheel. In the roller body constituting the second molded body, The roller main body is formed so that the diameter of the portion sandwiched between the two star wheels is larger than the diameter of the portion located outside the two star wheels. 1).

  In the manufacturing method of the transport roller, through holes are formed in the two star wheels, respectively, and in the first insert molding, the first portion of the roller body is inserted through the through hole of the first star wheel. The first molded product is molded so as to be in a state, and in the second insert molding, the second molding is performed so that the second portion of the roller body is inserted through the through hole of the second star wheel. An object may be formed (claim 2).

  Further, in the manufacturing method of the transport roller, in the first insert molding, a recessed portion is formed in the first portion of the roller main body, and in the second insert molding, the roller body second in the recessed portion. A part of the material constituting the part may be filled (claim 3).

  In order to achieve the above object, according to another transport roller manufacturing method of the present invention, in the transport roller manufacturing method, the first, second and third star wheels having substantially the same outer diameter are roller bodies. In the manufacturing method of the transport roller for manufacturing the transport roller provided concentrically with respect to the first, the first portion of the roller body is provided over the front and back of the first star wheel by the first insert molding. 1 molding is formed, and the second molding is formed by integrating the second part of the roller body provided over the front and back of the second star wheel with the first molding by the second insert molding. And, by the third insert molding, the third molding is formed by integrating the third part of the roller body provided over the front and back of the third star wheel with respect to the second molding, In the roller body constituting the third molded product, the diameter of the portion sandwiched between the first and second star wheels is larger than the diameter of the portion sandwiched between the second and third star wheels. In addition, the roller body is formed so that the diameter of the portion sandwiched between the second and third star wheels is larger than the diameter of the portion located outside the first and third star wheels. (Claim 4).

  Further, in the manufacturing method of the transport roller, through holes are respectively formed in the three star wheels, and in the first insert molding, the first portion of the roller body has the through holes of the first star wheel. The first molded product is molded so as to be inserted, and in the second insert molding, the second part of the roller main body is inserted into the through hole of the second star wheel. In the third insert molding, the third molded product is molded so that the third portion of the roller body is inserted through the through hole of the third star wheel. Good (Claim 5).

  Further, in the manufacturing method of the transport roller, in the first insert molding, a recessed portion is formed in the first portion of the roller main body, and in the second insert molding, the roller body second in the recessed portion. In the second insert molding, a recessed portion is formed in the second portion of the roller body, and in the third insert molding, the roller body is filled in the recessed portion. A part of the material forming the third portion may be filled (claim 6).

  According to the first aspect of the present invention, a method for manufacturing a transport roller that can reduce the manufacturing cost can be obtained. That is, if the diameter of the roller body is the same from one end side to the other end side (dimension cylinder), as described above, a mold that slides in multiple directions is required, and a large number of rollers are obtained at once (many a large number are taken. ) And the manufacturing cost increases accordingly. However, in the present invention, the shape of the roller body is made special, and specifically, the diameter of the portion sandwiched between the two star wheels is larger than the diameter of the portion located outside the two star wheels. Therefore, the transport roller can be manufactured using a mold that operates only in the mold opening direction without using the slide mold as described above, and the manufacturing cost can be reduced, and further the manufacturing can be performed. It can also contribute to the improvement of efficiency.

  In the invention according to claim 2, the roller main body and the first and second star wheels are integrated very suitably, and the conveyance roller capable of manufacturing a conveyance roller excellent in strength is provided. A manufacturing method is obtained.

  In the invention according to claim 3, the integration of the first part and the second part of the roller body is very suitably performed, and the manufacture of the transport roller capable of manufacturing the transport roller excellent in strength is achieved. A method is obtained.

  In the inventions according to claims 4 to 6, the same effects as those of the inventions according to claims 1 to 3 can be similarly obtained, and a transport roller having three star wheels and improved transport performance can be manufactured. The manufacturing method of the conveyance roller which also has an effect is obtained.

  FIG. 1 is an explanatory view schematically showing a configuration of a transport body 2 using a transport roller 1 obtained by the transport roller manufacturing method according to the first embodiment of the present invention, FIG. FIG. 2B is a longitudinal sectional view and a side view schematically showing the configuration of the conveying roller 1.

  As shown in FIG. 1, the transport roller 1 obtained by the transport roller manufacturing method of the present embodiment is attached to the shaft body 3 at an appropriate interval, whereby the transport body 2 is configured. The transport body 2 is used as, for example, a paper feed roller for a copying machine or a printer.

  Here, as shown in FIG. 1 and FIGS. 2A and 2B, the transport roller 1 includes a roller main body 4 and a first star wheel provided concentrically with the roller main body 4. 5 and a second star wheel 6, and an insertion hole 1 a through which the shaft body 3 is inserted is provided at the center.

  In the roller body 4, a portion 4a sandwiched between the two star wheels 5 and 6 is located on the outside of the star wheel 5 (on the left side in FIG. 2A) and on the outside of the star wheel 6 (FIG. 2). In (A), the diameter is larger than the part 4c located on the right side). The roller body 4 is made of a synthetic resin such as polyamide or polyacetal.

  The star wheels 5 and 6 have substantially the same outer diameter, and have the same shape in this embodiment. As shown in FIG. 3, each star wheel 5, 6 has a central hole 7 having a relatively large diameter provided in the central portion, and a plurality of relatively small diameters provided around the hole 7 (see FIG. 3). In the example shown, there are four) through-holes 8. The plurality of through holes 8 are provided at substantially equal intervals around the hole 7. The star wheels 5 and 6 are made of metal or synthetic resin.

  And the manufacturing method of the conveyance roller of this Embodiment is performed as shown to FIG. 4 (A)-(C). That is, FIGS. 4A to 4C are explanatory views schematically showing a method of manufacturing the transport roller. In the manufacturing method, the star wheels 5 and 6 are manufactured in advance by an appropriate method. First, as a first step, the first star wheel 5 is set (inserted) in a first mold (mold) 9. (See FIG. 4A). Here, as shown in FIG. 4A, the first mold 9 includes a column part (core part) 9 a that passes through the central hole 7 of the first star wheel 5, and the first star wheel 5. And an annular portion 9b for holding a portion outside the plurality of through holes 8.

  Subsequently, as a second step, the first star wheel 5 set in the first mold 9 is sandwiched between the first mold 9 and the second mold 10 (see FIG. 4A). ). Here, the second mold 10 has an annular portion 10a that abuts a portion of the first star wheel 5 outside the plurality of through holes 8, and the inner diameter of the annular portion 10a is the first mold. 9 is larger than the inner diameter of the annular portion 9b. The second mold 10 includes an annular protrusion 10b for forming an annular recess 11 (see FIG. 4B) in a first molded product 13 described later, and a column portion 9a of the first mold 9. It has an insertion hole 10c for insertion.

  Thereafter, as a third step, a material in which the material of the roller body 4 is melted is poured into the sealed space S1 (see FIG. 4A) formed by the two molds 9 and 10, and is cooled. Thereby, the first insert molding for forming the first molded product 13 (see FIG. 4B) in which the first portion 12 of the roller body 4 is provided on the front and back of the first star wheel 5 is completed. Here, the space in the mold 9 and the space in the mold 10 forming the sealed space S1 are, as shown in FIG. 4 (A), a central hole 7 and a through hole provided in the first star wheel 5. 8 is in a state of communication. Further, in the first molded product 13, the first portion 12 of the roller body 4 is in a state of being inserted through each through hole 8 of the first star wheel 5.

  Next, as a fourth step, the second mold 10 is isolated from the first mold 9, and the second star wheel 6 is set on the first mold 9 with the first molded product 13 set. (See FIG. 4B). At this time, the through holes 8 of the second star wheel 6 are positioned above the recessed portions 11 of the first molded product 13.

  Subsequently, as a fifth step, the second star wheel 6 set in the first mold 9 is sandwiched between the upper portion of the first molded product 13 and the third mold 14 (FIG. 4B). )reference). Here, the third mold 14 is an annular portion that comes into contact with a portion outside the plurality of through holes 8 in the second star wheel 6 (a portion outside the recessed portion 11 above the first molded product 13). 14a, and the inner diameter of the annular portion 14a is smaller than the outer diameter of the upper portion of the first molded product 13 (the first portion 12 of the roller body 4). The third mold 14 has an insertion hole 14b through which the column portion 9a of the first mold 9 is inserted.

  Thereafter, as a sixth step, a material in which the material of the roller body 4 is melted is poured into the sealed space S2 (see FIG. 4B) formed by the first molded product 13 and the third mold 14. Let this cool. As a result, the second molded product 16 is integrated with the first molded product 13 by integrating the second portion 15 of the roller body 4 provided on the front and back surfaces of the second star wheel 6 (see FIG. 4C). The second insert molding to form is completed. Here, the space in the recessed portion 11 forming the sealed space S2 and the space in the third mold 14 are a central hole provided in the second star wheel 6 as shown in FIG. 7 and the through hole 8 communicate with each other. Accordingly, a part of the material forming the second portion 15 of the roller body 4 is filled in the recessed portion 11. As shown in FIG. 4C, in the second molded product 16, the second portion 15 of the roller body 4 is in a state of being inserted through each through hole 8 of the second star wheel 6.

  Finally, as the seventh step, the second mold 16 can be taken out from the first mold 9 by isolating the third mold 14 from the first mold 9, and this is the transfer roller 1. It becomes. That is, the transport roller manufacturing method is completed.

  In the transport roller 1 manufactured by the above manufacturing method, the first portion 12 is formed by filling a part of the second portion 15 into the recessed portion 11 provided in the first portion 12 of the roller body 4. And the second portion 15 are integrated very favorably.

  Further, in the transport roller 1 manufactured by the above manufacturing method, the first portion 12 of the roller body 4 is inserted through each through hole 8 of the first star wheel 5, and similarly, the second portion 15 is the second portion 15. Since the through holes 8 of the second star wheel 6 are inserted, the roller main body 4 and the first and second star wheels 5 and 6 are also integrated very suitably.

  Further, in the above manufacturing method, as shown in FIG. 4C, in the roller body 4 constituting the second molded product 16 (conveying roller 1), a portion 17 sandwiched between the two star wheels 5 and 6 is provided. The roller body 4 is formed such that the diameter (outer diameter) of the roller is larger than the diameters (outer diameters) of the portions 18 and 19 located outside the two star wheels 5 and 6. Therefore, when the second star wheel 6 is sandwiched between the first molded product and the third mold 14 in the fifth step (see FIG. 4B), the annular portion 14a of the third mold 14 is obtained. Can be brought into contact with the upper peripheral edge of the first portion 12 of the roller body 4. Therefore, the downward pressure by the third mold 14 is substantially received by the first portion 12 (first molded product 13), and the second star wheel 6 is deformed by the pressure. In addition, the configuration and forming process of the mold to be used can be simplified. In other words, the transport roller 1 has a structure that enables insert molding without using a slide in a mold (mold) used in the above manufacturing method.

  Further, since both ends of the insertion hole 1a of the conveying roller 1 formed by the above manufacturing method are tapered as shown in FIG. 4C, the shaft body 3 is inserted into the insertion hole 1a. The work to insert is performed more smoothly.

  Further, since the shapes and sizes of the portions 18 and 19 of the transport roller 1 formed by the manufacturing method are substantially the same, the rotation of the transport roller 1 around the axis is performed in a balanced and smooth manner. become.

  In the first embodiment, for example, a plurality of the molds 9, 10, and 14 are arranged side by side, and the star wheel is a sheet-like body (etching sheet or the like) so as to match the arrangement of the molds ) And a plurality of (for example, about 100) transport rollers 1 can be easily manufactured at a time. In this case, the production cost can be reduced. Will be further reduced.

  Here, FIGS. 4A to 4C show a method for manufacturing the transport roller 1 having the two star wheels 5 and 6, but the present invention is not limited to this, and the same shape as the star wheels 5 and 6 is used. You may manufacture the conveyance roller 21 (refer FIG.5 (C)) which also has the 3rd star wheel 20. FIG. Hereinafter, a manufacturing method for manufacturing the transport roller 21 will be described with reference to FIGS. That is, FIGS. 5A to 5C are explanatory views schematically showing a method of manufacturing the transport roller according to the second embodiment of the present invention.

  First, in the manufacturing method according to the second embodiment, the steps from the first step to the fourth step of the manufacturing method according to the first embodiment are similarly performed. Will not be described again. In the first embodiment, the third mold 14 shown in FIG. 4B is used in the fifth step, but in the second embodiment, the third mold 14 is replaced with the third mold 14 shown in FIG. A third mold 22 shown in (A) is used.

  That is, as the fifth step, the second star wheel 6 set in the first mold 9 is sandwiched between the upper portion of the first molded product 13 and the third mold 22 (FIG. 5A). reference). Here, the third mold 22 is an annular portion that comes into contact with a portion outside the plurality of through holes 8 in the second star wheel 6 (a portion outside the recessed portion 11 above the first molded product 13). The inner diameter of the annular portion 22a is smaller than the outer diameter of the upper portion of the first molded product 13 (the first portion 12 of the roller body 4). The third mold 22 includes an annular protrusion 22b for forming an annular recess 25 (see FIG. 5B) in a second molded product 24, which will be described later, and a column portion 9a of the first mold 9. It has an insertion hole 22c for insertion.

  Thereafter, as a sixth step, a material in which the material of the roller body 4 is melted is poured into the sealed space S3 (see FIG. 5A) formed by the first molded product 13 and the third mold 22, Let this cool. As a result, the second molded product 24 is obtained by integrating the second portion 23 of the roller body 4 provided over the front and back surfaces of the second star wheel 6 with respect to the first molded product 13 (see FIG. 5B). The second insert molding to form is completed. Here, the space in the recessed portion 11 and the space in the third mold 22 that form the sealed space S3 are a central hole provided in the second star wheel 6 as shown in FIG. 7 and the through hole 8 communicate with each other. Further, as shown in FIG. 5B, in the second molded product 24, the second portion 23 of the roller body 4 is in a state of being inserted through each through hole 8 of the second star wheel 6.

  Next, as a seventh step, the third mold 22 is isolated from the first mold 9 and the third star wheel 20 is set in the first mold 9 in a state where the second molded product 24 is set. (See FIG. 5B). At this time, each through hole 8 of the third star wheel 20 is positioned above the recessed portion 25 of the second molded product 24.

  Subsequently, as an eighth step, the third star wheel 20 set in the first mold 9 is sandwiched between the upper part of the second molded product 24 and the fourth mold 26 (FIG. 5B). )reference). Here, the fourth mold 26 is an annular portion that comes into contact with a portion outside the plurality of through holes 8 in the third star wheel 20 (a portion outside the recessed portion 25 above the second molded product 24). 26a, and the inner diameter of the annular portion 26a is smaller than the outer diameter of the upper portion of the second molded product 24 (second portion 23 of the roller body 4). The fourth mold 26 has an insertion hole 26b through which the column portion 9a of the first mold 9 is inserted.

  After that, as a ninth step, the melted material of the roller body 4 is poured into the sealed space S4 (see FIG. 5B) formed by the second molded product 24 and the fourth mold 26, Let this cool. As a result, the third portion 28 of the roller body 4 provided on the front and back surfaces of the third star wheel 20 is integrated with the second molded product 24 so as to integrate the third molded product 28 (see FIG. 5C). The third insert molding to form is completed. Here, the space in the recessed portion 25 and the space in the fourth mold 26 that form the sealed space S4 are a central hole provided in the third star wheel 20 as shown in FIG. 7 and the through hole 8 communicate with each other. Further, as shown in FIG. 5C, in the third molded product 28, the third portion 27 of the roller body 4 is in a state of being inserted through each through hole 8 of the third star wheel 20.

  Finally, as the tenth step, by separating the fourth mold 26 from the first mold 9, the third molded product 28 can be taken out from the first mold 9, and this is the transport roller 21. It becomes. That is, the transport roller manufacturing method is completed.

  In the transport roller 21, the diameter (outer diameter) of the portion 17 sandwiched between the first and second star wheels 5, 6 is the portion sandwiched between the second and third star wheels 6, 20. The diameter (outer diameter) of the portion 29 sandwiched between the second and third star wheels 6 and 20 is larger than the diameter (outer diameter) of 29 and the first and third star wheels 5. , 20 is larger than the diameters of the portions 18, 19 located on the outside.

  In the manufacturing method according to the second embodiment, in addition to the effects obtained in the manufacturing method according to the first embodiment, the manufactured transport roller 1 has three star wheels 5, 6, and 20. In addition, an effect of further improving the conveyance performance can be obtained.

  In addition, this invention is not restricted to said embodiment, It can implement in various deformation | transformation. Specifically, the transport rollers 1 and 21 are not limited to paper feeding rollers, and can be used as various rollers or rolling elements.

  Moreover, although the example which manufactures the rollers 1 and 21 which have two or three star wheels was shown in said two embodiment, it uses from the 5th process in the 2nd embodiment to the 7th process. It is also possible to manufacture a conveyance roller having four or more star wheels by repeating the process by reducing the diameter of the annular portion of the mold appropriately.

  In the first embodiment, the first portion 12 and the second portion 15 of the roller body 4 may be made of the same or the same material, or may be made of different materials. . Similarly, in the second embodiment, the first portion 12, the second portion 23, and the third portion 27 of the roller body 4 may be made of the same or the same material, or may be made of different materials. It may be configured.

It is explanatory drawing which shows roughly the structure of the conveyance body using the conveyance roller obtained by the manufacturing method of the conveyance roller which concerns on 1st Embodiment of this invention. (A) And (B) is the longitudinal cross-sectional view and side view which show the structure of the said conveyance roller roughly. It is a side view which shows roughly the structure of the star wheel of the said conveyance roller. (A)-(C) are explanatory drawings which show roughly the manufacturing method of the said conveyance roller. (A)-(C) are explanatory drawings which show roughly the manufacturing method of the conveyance roller which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveyance roller 4 Roller main body 5 1st star wheel 6 2nd star wheel 12 1st part 13 1st molded product 15 2nd part 16 2nd molded product 17 The part pinched | interposed 18 The part located outside 19 Outside Location of position

Claims (6)

  A conveying roller manufacturing method for manufacturing a conveying roller in which first and second star wheels having substantially the same outer diameter are provided concentrically with respect to a roller body. The first molded product provided with the first portion of the roller body was formed over the front and back of the star wheel, and the first molded product was provided over the front and back of the second star wheel by the second insert molding. The second part of the roller body is integrated to form a second molded product, and in the roller body constituting the second molded product, the diameter of the portion sandwiched between the two star wheels is two star A method for manufacturing a transport roller, wherein the roller body is formed so as to be larger than a diameter of a portion located outside the wheel.   Through holes are respectively formed in the two star wheels, and in the first insert molding, the first molding is performed so that the first portion of the roller body is inserted through the through hole of the first star wheel. In the second insert molding, the second molded product is molded such that the second portion of the roller body is in a state of being inserted through the through hole of the second star wheel. The manufacturing method of the conveyance roller of description.   In the first insert molding, a recessed portion is formed in the first portion of the roller body, and in the second insert molding, a portion of the material forming the second portion of the roller body is filled in the recessed portion. The manufacturing method of the conveyance roller of Claim 1 or 2.   A conveying roller manufacturing method for manufacturing a conveying roller in which first, second, and third star wheels having substantially the same outer diameter are provided concentrically with respect to a roller body. The first molded product provided with the first portion of the roller body is formed over the front and back of the first star wheel, and the first molded product is applied to the front and back of the second star wheel by the second insert molding. The second body of the provided roller body is integrated to form the second molded product, and the roller body provided on the front and back of the third star wheel with respect to the second molded product by the third insert molding The third part is integrated to form a third molded product, and in the roller body constituting the third molded product, the diameter of the portion sandwiched between the first and second star wheels is The diameter of the portion sandwiched between the second and third star wheels is larger than the diameter of the portion sandwiched between the second and third star wheels, and the diameter of the portion sandwiched between the second and third star wheels is outside the first and third star wheels. A method for manufacturing a transport roller, wherein the roller body is formed so as to be larger than a diameter of a portion located at a position.   Through holes are respectively formed in the three star wheels, and in the first insert molding, the first molding is performed so that the first portion of the roller body is inserted through the through holes of the first star wheel. Forming a second molded product so that the second portion of the roller body is inserted through the through hole of the second star wheel in the second insert molding, 5. The method of manufacturing a transport roller according to claim 4, wherein in the third insert molding, the third molded product is molded such that the third portion of the roller body is inserted through the through hole of the third star wheel.   In the first insert molding, a recessed portion is formed in the first portion of the roller body, and in the second insert molding, a portion of the material forming the second portion of the roller body is filled in the recessed portion. On the other hand, in the second insert molding, a recessed portion is formed in the second portion of the roller body, and in the third insert molding, a part of the material constituting the third portion of the roller body is formed in the recessed portion. The manufacturing method of the conveyance roller of Claim 4 or 5 with which it fills.

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