JP2001072273A - Roller shaft and flapper for paper feed and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a roller shaft and a flapper with no burrs even though resin parts of the roller shaft and the flapper have large wall thickness, simply at a remarkably reduced const while having a strong torque. SOLUTION: A roller shaft 1 is composed of a metal shaft 2 and resin rollers 5, 6, 7 fitted on the metal shaft 2. The resin rollers 5, 6, 7 are formed by such a method that core parts 8, 9, 10 are integrally molded around the metal shaft through injection molding, and thereafter, the surfaces of the core parts and the outer surface of the shaft are integrally molded thereto with outer shell parts 11, 12, 13. During the manufacture thereof, dies having a primary molding part which can integrally molding the core parts of the rollers on the metal shaft, and a secondary molding part 17 which can integrally mold the outer shell parts around the outer surfaces of the roller core parts and the shaft. A molded product in the primary molding part is inserted in the secondary molding part so that the primary molded product and a completed product can be simultaneously molded. Further, a flapper 21 can be molded in a similar configuration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed roller shaft built into office automation equipment such as office computers, copiers and fax machines, and a flapper used to control the direction of paper movement. It is about.

[0002]

2. Description of the Related Art Conventionally, a resin roller or a resin flapper with a metal shaft used for OA equipment is formed by separately molding a resin roller portion and a resin blade in accordance with the shape thereof, and press-fitting the metal shaft. In many cases, the contact portion is fixed with an adhesive before use. However, according to this method, in the case of a thick shape, a required number of faces are produced for a complex mold with a cutout, each is molded separately, and the molded product is fixed at a designated position with a fixing jig. It must be set and the metal shaft and the molded product must be bonded and fixed. Therefore, there are many manufacturing processes, which contributes to high cost, and furthermore, press-fitting the shaft,
Due to the adhesion, the rotation torque is weak, and the dimensional accuracy such as vibration is lost. Further, in general, the thermoplastic resin shrinks after molding, and in particular, a phenomenon of sink occurs in a thick part, resulting in poor appearance or deformation due to sink, which may deteriorate dimensional accuracy.

[0003] In view of the above problems, the conventional gas forming method,
Integral molding with twin-screw molding machines, measures to prevent sink marks, etc. are also performed, but all of these require special equipment and molding machines with special specifications, and the dies used are special Since a mold was required, it was difficult for an ordinary molding manufacturer to handle it. Further, the cost of metal shafts is very high at present, and is a bottleneck for OA equipment shafts. Therefore, the cost is reduced by converting the shaft to 100% resin and integrating it with the roller. However, according to this method, it is necessary to use a resin having higher strength, but this is inevitably expensive. Use of the resin increases the cost. Further, even if the resin shaft has high strength, its accuracy is far lower than that of a metal shaft. Further, when the outer peripheral portion of the roller or the outer peripheral portion of the rubber roller mounted on the resin roller is polished, the shaft is bent due to the polishing pressure, and the polishing cannot be performed.

[0004]

Therefore, according to the present invention, sink does not occur even if the resin portion of the roller shaft or the flapper is thick, so that the dimensional accuracy is high and the appearance is good. Another object of the present invention is to provide a roller shaft or a flapper which is easy to manufacture, can further reduce the cost, and has a strong rotating torque.

[0005]

In order to achieve the above-mentioned object, a roller shaft according to the present invention has a required number of resin rollers arranged in parallel at a predetermined interval around a metal shaft. The shaft is provided with a locking portion at a roller fixing portion. The resin roller is formed by integrally molding a core portion around the shaft by injection molding, and then integrally molding a skin portion on the surface of the core portion. In some cases, the core portion of the resin roller is integrally formed by injection molding, and then the skin portion of the roller and the skin portion of the shaft body are integrally formed.
Further, the roller skin portion and the entire skin portion of the shaft can be integrally formed.

In order to manufacture the roller shaft, a mold provided with a primary molding portion and a secondary molding portion of the roller shaft on an injection molding die surface is used. Is arranged such that a required number of resin material cores can be arranged side by side at predetermined intervals around a metal shaft, and the secondary molding part is a roller core material part molded by the primary molding part. The roller skin portion can be integrally formed. Thus, a metal shaft is inserted into the primary molding part, and a primary molded product in which the roller core is integrally molded in the primary molding part is inserted into the secondary molding part to form the primary molded product and the finished product I did it. In addition, the roller
By providing a primary molding part and a secondary molding part of a shaft on one surface of a mold and using a mold connected by a runner, it is possible to simultaneously mold a primary molded product and a completed secondary molded product. In some cases, the secondary forming portion forms a mold so that the roller skin portion and the skin portion of the entire shaft can be integrally formed.

Further, in the flapper according to the present invention, a required number of resin blades having a suitable shape are arranged in parallel around a metal shaft at a predetermined interval, and the resin blade is integrally formed with its core by injection molding. After that, the blade skin and the shaft body skin were integrally formed.

In order to manufacture the flapper, a mold having a flapper primary molding portion and a secondary molding portion provided on an injection molding die surface is used. The primary molding portion comprises:
A required number of resin blade core portions having an appropriate shape can be arranged in parallel around the shaft at regular intervals, and the secondary molding portion includes a blade core portion molded by the primary molding portion and a shaft surface. The surface of the skin part can be integrally molded, a metal shaft is inserted in the primary molding part, and a primary molded product in which the blade core material part is integrally molded in the primary molding part is inserted in the secondary molding part, The primary and finished products were molded. Further, by providing the primary molding portion and the secondary molding portion of the flapper on one surface of a mold and using a mold connected by a runner, it is also possible to simultaneously produce a primary molded product and a completed secondary molded product. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A roller shaft according to the present invention has a required number of resin rollers arranged in parallel at a predetermined interval around a metal shaft.
A locking portion was provided at the roller fixing point. The resin roller was formed by integrally molding a core portion around the shaft by injection molding, and then integrally molding a skin portion on the surface of the core portion. In some cases, the core portion of the resin roller is integrally formed by injection molding, and then the skin portion of the roller and the skin portion of the shaft body are integrally formed. Further, the roller skin portion and the entire skin portion of the shaft can be integrally formed.

In order to manufacture the roller shaft, a mold provided with a primary molding portion and a secondary molding portion of the roller shaft on an injection molding die surface is used. In the peripheral diagram of the shaft, a required number of resin roller core portions having an appropriate shape can be arranged in parallel at a predetermined interval, and the secondary molding portion is a roller core material portion molded by the primary molding portion. The roller skin portion can be integrally formed. Thus, a metal shaft is inserted into the primary molding part, and a primary molded product in which the roller core is integrally molded in the primary molding part is inserted into the secondary molding part to form the primary molded product and the finished product I did it. Further, a primary molding portion and a secondary molding portion of the roller shaft are provided on one surface of a mold,
When a mold connected by a runner is used, the primary molded product and the finished product can be molded simultaneously by directly inserting the primary molded product into the secondary molded portion. On the other hand, when the primary molding section and the secondary molding section are provided on different mold surfaces, the primary molded article molded by the mold of the primary molding section is inserted into the secondary molding section of another mold. A finished product of secondary molding can also be obtained. In some cases, the secondary forming portion is formed so that the roller skin portion and the shaft body portion or the entire skin portion of the shaft can be integrally formed.

Further, in the flapper according to the present invention, a required number of resin blades of an appropriate shape are arranged in parallel around the metal shaft at a predetermined interval, and the resin blade is integrally formed with its core portion by injection molding. After that, the blade skin and the shaft body skin were integrally formed.

In order to manufacture the flapper, a mold provided with a flapper primary molding section and a secondary molding section on an injection molding mold surface is used, and the primary molding section comprises:
A required number of resin blade core portions having an appropriate shape can be arranged in parallel around the shaft at regular intervals, and the secondary molding portion includes a blade core portion molded by the primary molding portion and a shaft surface. The skin portion can be integrally molded. Thus, the shaft is inserted into the primary molding portion, and the primary molding product in which the blade core portion is integrally molded in the primary molding portion is inserted into the secondary molding portion to form the primary molded product and the finished product. I did it. In addition, when the primary molding part and the secondary molding part of the flapper are provided on one surface of a mold, and a mold connected by a runner is used, the primary molding part is directly inserted into the secondary molding part, so that the primary molding part is formed. And finished products can be molded at the same time.

[0013]

Embodiment 1 Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes the entire roller shaft, 2 denotes its metal shaft, 3 denotes a shaft body,
Denotes a shaft bearing portion, and 5, 6, and 7 denote respective resin roller portions. Reference numerals 8, 9, and 10 denote respective core portions of the resin rollers 5, 6, and 7, and reference numerals 11, 12, and 13 denote respective skin portions. Therefore,
The resin roller portion has a core portion around a shaft 2 forming a metal core, and a skin portion is integrally formed outside the core portion to form a three-layer structure. The shaft main body portion 3 is formed to have a larger diameter than the bearing portion 4, and a locking portion 14 formed by knurling or hole processing is provided at a position where the roller is provided, in order to prevent the position shift and rotation of the roller. is there. In order to mold the roller shaft 1, an injection mold as shown in FIG.
Use 15. A primary molding section 16 and a secondary molding section 17 are provided on the mold surface, and are connected by a runner 19 having an injection port 18. In the figure, reference numeral 23 denotes a mold fixing pin. Primary molding section
In 16, core members 8, 9, and 10 of resin rollers having an appropriate shape can be arranged in parallel around the shaft body 3 at a predetermined interval. The secondary forming part 17 is formed so that the roller skin parts 11, 12, 13 can be integrally formed with the roller core parts 5, 6, 7 formed by the primary forming part 16.
Therefore, when this mold 15 is used, the shaft 3 is inserted into the primary molding portion 16, and the primary molded product in which the roller core portion is integrally molded in the primary molding portion is inserted into the secondary molding portion 17. The primary and secondary molded products are simultaneously molded.

[0014]

[Embodiment 2] In the above example, the shaft main body 3 is formed to have a larger diameter than the bearings 4 at both ends, but in this embodiment, the shaft main body 3 has the same diameter as the bearing 4 as shown in FIG. When the secondary molding of the skin 20 is performed using the roller skin 1
It was integrally molded with the bearings 1, 12, and 13 to form a larger diameter than the bearing part 4. In other words, the secondary molding portion 17 of the mold is provided, and a resin skin portion 20 is provided on the shaft main body portion 3 so that a large diameter molding can be performed. Other configurations are the same as the above example.

[0015]

Embodiment 3 In this embodiment, as shown in FIG. 5, a resin skin portion is provided on the entire shaft main body 3 and bearing 4. That is, the secondary molding portion 17 of the mold is used to form the skin portion 20 on the entire shaft. Other configurations are the same as the above example.

[0016]

Fourth Embodiment In FIGS. 6 to 10, 21 indicates the entire flapper as a finished product, 22 indicates a metal shaft, 24 indicates a shaft bearing, and 25, 26 and 27 indicate resin blades. Thus,
28, 29, 30 are the core parts of the resin blades 25, 26, 27, 31, 32,
Numeral 33 indicates its epidermis. Therefore, each resin blade portion has a core portion around the shaft 22 forming a core, and a skin portion is integrally formed on the outside of the shaft portion to form three layers. Reference numeral 34 denotes a shaft skin portion. To mold the flapper, although not shown, an injection mold as shown in FIG. 2 is used. In this case, the mold surface is provided with a primary molding portion and a secondary molding portion, and the structure is the same as that of the mold surface, which is connected by a runner having an injection port. Thus, as can be seen from the primary molded product 35 shown in FIG. 7, core portions 28, 29, and 30 of resin blades of an appropriate shape are provided at regular intervals around the shaft 22 in the primary molded portion of the mold. The required number can be arranged in parallel. Further, as can be seen from the finished secondary molded product 21 shown in FIG. 6, the blade core portions 28, 2 formed in the primary molded portion are provided in the secondary molded portion.
The blade skins 31, 32, 33 are formed integrally with the blades 9, 30, respectively. Therefore, when using the mold of the present example, the shaft 22 is inserted into the primary molding portion, and the primary molded product 35 in which the blade core portion is integrally molded in the primary molding portion is inserted into the secondary molding portion, The primary molded product and the finished product were molded at the same time.

[0017]

According to the present invention having the above structure, the following effects are obtained. According to the configuration of the first aspect, the roller is formed by integrally molding the core portion of the roller with the shaft by primary molding and then integrally molding the roller skin portion by secondary molding, so that the resin roller portion is thick. No sink marks occur. Therefore, the dimensional accuracy is not impaired and the appearance is good. Further, it is easy to manufacture, the cost can be reduced, and the rotating torque is strong. According to the second aspect of the present invention, since the skin portion of the shaft body and the skin portion of the roller are integrally formed, a metal material for the shaft can be saved, and a hole for preventing displacement of the roller and preventing rotation of the shaft is provided on the shaft. No processing or knurling is required. Further, the weight of the roller shaft can be reduced and the rotational torque can be increased. As described above, it is possible to prevent sinks in the thick resin portion. According to the configuration of the third aspect, the roller is formed integrally with the core material portion, and then the roller skin portion and the entire skin portion of the shaft are integrally formed of resin, thereby preventing rust and improving dimensional accuracy such as runout. In addition to the fact that the rotational torque can be increased, various effects such as the prevention of sink marks are produced as in the preceding paragraph.

According to a fourth aspect of the present invention, a primary molded article molded in a primary molding section of a mold is put into a secondary molding section and molded to form a thick resin roller. A general molding company can easily produce a finished product that produces various effects such as no sink marks even in a part using a general-purpose molding machine and an extremely general mold structure. According to the configuration of the fifth aspect, since the primary molding portion and the secondary molding portion are provided on the same surface of the mold, the production cost of the mold can be significantly reduced, and the molding operation becomes very easy, so that the cost can be further reduced. Can be measured.

According to the configuration of the seventh aspect, also for the flapper, the core portion of the resin blade is primarily formed and the skin portion is formed secondarily so that the roll shaft can be formed even if the resin blade portion is thick. The same effects as in the case occur. According to the constitutions of the eighth and ninth aspects, an excellent flapper can be easily formed at a reduced cost with respect to the molding of the flapper, similarly to the case of the roll and shaft molding according to the fourth and fifth aspects. .

[Brief description of the drawings]

FIG. 1 is a plan view, partially in section, of a roll shaft according to the present invention.

FIG. 2 is a plan view of a mold.

FIG. 3 is a plan view showing a state of a molded product after molding.

FIG. 4 is a plan view and a partial cross section of a roll shaft according to a second embodiment.

FIG. 5 is a plan view and a partial cross section of a roll shaft according to a third embodiment.

FIG. 6 is a plan view of a flapper according to the present invention.

FIG. 7 is a plan view of a primary molded product of the flapper.

FIG. 8 is a sectional view taken along line AA in FIG. 6;

FIG. 9 is a sectional view taken along line BB in FIG. 6;

FIG. 10 is a sectional view taken along line CC in FIG. 6;

[Sign]

 DESCRIPTION OF SYMBOLS 1 Roller shaft 2 Metal shaft 3 Shaft main body part 4 Shaft bearing part 5 Resin roller 6 Resin roller 7 Resin roller 8 Roller core part 9 Roller core part 10 Roller core part 11 Roller skin part 12 Roller skin part 13 Roller skin part Part 14 Locking part 15 Injection molding die 16 Primary molding part 17 Secondary molding part 18 Inlet 19 Runner 20 Shaft skin part 21 Flapper 22 Metal shaft 24 Shaft bearing part 25 Resin blade 26 Resin blade 27 Resin blade 28 Blade core Material part 29 Blade core part 30 Blade core part 31 Blade skin part 32 Blade skin part 33 Blade skin part 34 Shaft skin part

Claims (9)

[Claims] 1. A roller shaft in which a required number of resin rollers of a suitable shape are arranged side by side at a predetermined interval around a metal shaft, wherein the metal shaft has a locking portion at a roller fixing portion. A paper feed roller shaft wherein the resin roller is formed by integrally molding a core portion around the shaft by injection molding, and then integrally molding a skin portion on the surface of the core portion. 2. A roller shaft in which a required number of resin rollers are arranged in parallel around a metal shaft at a predetermined interval at a predetermined interval, and said resin roller is formed by integrally molding a core portion thereof by injection molding. A roller shaft for paper feeding, in which the roller skin and the skin of the shaft body are integrally formed. 3. A roller shaft in which a required number of resin rollers are arranged in parallel around a metal shaft at a predetermined interval at a predetermined interval. The resin roller is formed by integrally molding a core portion thereof by injection molding. A paper feed roller shaft formed by integrally molding the roller skin and the entire shaft. 4. A mold in which a primary molding portion and a secondary molding portion of a roller shaft are provided on an injection molding die surface, wherein the primary molding portion has an appropriate shape around the shaft. The required number of core portions of the resin roller can be arranged in parallel at regular intervals, and the secondary molding portion can integrally form a roller skin portion with the roller core portion molded by the primary molding portion. A metal shaft is inserted into the primary molding part, and a shaft in which the roller core part is integrally molded in the primary molding part is inserted into the secondary molding part, so that the primary molded product and the finished product are molded. Manufacturing method of roller shaft for paper feed. 5. A mold for injection molding, wherein a primary molding part and a secondary molding part of a roller shaft are provided on one surface, and a mold connected by a runner is used, wherein the primary molding part comprises:
A required number of resin roller cores having an appropriate shape can be arranged in parallel around the metal at regular intervals, and the secondary molding part is provided with a roller skin on the roller core part molded by the primary molding part. The part can be integrally molded, the shaft is inserted into the primary molding part, the primary molded part with the roller core material integrally molded in the primary molding part is inserted into the secondary molding part, and the primary molded part is completed A method for manufacturing a roller shaft for paper feeding in which articles are formed simultaneously. 6. The method of manufacturing a roller shaft for paper feeding according to claim 4, wherein the secondary forming portion of the mold is configured such that a roller skin portion and a shaft skin portion can be integrally formed. 7. A flapper in which a required number of resin blades are arranged side by side at predetermined intervals around a metal shaft. The resin blades are formed by integrally molding a core portion thereof by injection molding, and then the blade skin is formed. Paper feed flapper formed integrally with the shaft and the skin of the shaft body. 8. A mold in which a primary molding portion and a secondary molding portion of a flapper are provided on a surface of a mold for injection molding, wherein the primary molding portion includes a resin having an appropriate shape around a shaft. A required number of core portions of the blades can be arranged in parallel at regular intervals, and the secondary forming portion is capable of integrally forming a skin portion on the shaft surface with the blade core portion formed by the primary forming portion. Insert the shaft into the primary molding part, insert the primary molded product in which the blade core material is integrally molded in the primary molding part into the secondary molding part, and mold the primary molded product and the finished product Manufacturing method of flapper for paper feeding. 9. A flapper primary molding section and a secondary molding section are provided on one surface of an injection molding mold, and a mold connected by a runner is used, wherein the primary molding section comprises a metal shaft. A required number of resin blade cores of a suitable shape can be arranged in parallel at regular intervals around the periphery, and the secondary molding section is provided with a skin on the shaft surface and the shaft core section molded by the primary molding section. The part can be integrally molded, the shaft is inserted into the primary molded part, the primary molded part in which the blade core part is integrally molded in the primary molded part is inserted into the secondary molded part, and the primary molded part is completed A method of manufacturing a paper feed flapper that is configured to simultaneously mold articles.