JPH0446896Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a roller mold.
More specifically, the present invention includes a cylindrical medium mold that can be used to form a rubber roller or plastic roller, a small diameter part that can be inserted into the lower part of the medium mold, and a large diameter part that is integrally fixed to the small diameter part. It consists of a lower mold with a shaft hole passing through the center of the shaft, a small diameter part that can be inserted into the lower part of the medium mold, and a large diameter part that is integrally fixed to the small diameter part. Furthermore, the present invention relates to a vertically divided three-part type roller forming mold consisting of an upper mold having a shaft hole passing through the center of the shaft.

[Prior Art] In recent years, the development of office automation equipment such as electronic copiers, word processors, personal computers, and fax machines has been truly remarkable. These office automation devices use rollers such as printing paper feed rollers and printer platen rollers.

These rollers are constructed by covering a shaft core material with a roller member.

FIG. 2A shows a front view of the roller, and FIG. As the roller member 1, rubber or plastic is used. Further, as the shaft core material 2, a metal rod or the like is used.

Conventional roller molding molds are shown in Figures 3 to 6.
A mold as shown in the figure was used.

Fig. 3 is a perspective view of a horizontally split mold, Fig. 4 is a partially omitted perspective view of its lower horizontally split mold, and Fig. 5 is a vertically divided type of upper, middle, and lower molds. FIG. 6 is an exploded perspective view of the roller molding die, and a vertical sectional view thereof.

In Figures 2 to 6, 3 is the center hole, 4
is the shaft hole, 5 is the injection port of the roller member, 6 is between the mold holes,
7 is the upper horizontally split horizontal mold, 8 is the lower horizontally split mold, 9
1 is an upper mold, 10 is a middle mold, and 11 is a lower mold.

To use the horizontally split mold shown in FIGS. 3 and 4, first, the core material 2 is inserted into the shaft hole 4, and then rubber or plastic is injected through the injection port 5 and molded. Molding is performed by simple heating, heat vulcanization, or heat press hardening. After molding, the upper horizontally split mold 7 and the lower horizontally split mold 8 are removed and the rollers are taken out. The removed roller has burrs on the upper and lower mold matching parts, resulting in non-uniformity, and it is necessary to grind or polish the burr parts.

On the other hand, the upper mold 9 in FIGS. 5 and 6,
In a roller molding mold that is vertically divided into three parts, the middle mold 10 and the lower mold 11, the upper mold 9, the middle mold 10, and the lower mold 11 are first assembled into a single piece.
Insert the shaft core material 2 through the shaft hole 4, then insert the injection port 5.
Rubber or plastic is injected and molded.

The removed roller after molding is characterized by the fact that there is no burr at the mating part unlike the roller molded with the horizontal mold shown in FIG.
The work of assembling and removing the middle mold 10 and the lower mold 11, the work of inserting the shaft core material 2, etc., were troublesome, and the practicality was poor.

That is, in assembling and disassembling the roller forming molds shown in FIGS. If it is extremely large, the shaft holes 4, 4
It is difficult to accurately set the shaft core materials 2, 2 at the center of the shaft. Conversely, when the inner circumferential diameter of the shaft holes 4, 4 is the same as or smaller than the outer diameter of the shaft core materials 2, 2, the insertability is extremely poor, making it difficult to improve productivity.

For this reason, the inner circumferential diameter of the shaft holes 4, 4 in practical use is usually set to be slightly larger than the outer diameter of the shaft core materials 2, 2. For this reason, the upper mold 9, the middle mold 1
0. In the operation of the 3-part type roller molding mold of the lower mold 11, the shaft core material 2 inserted into the shaft hole 4 is eccentric as shown in FIG. 7, and a roller with uniform rotation performance is formed. It was difficult to obtain.

When the eccentric roller was used as a roller for office automation equipment, it caused uneven paper feeding speed and irregular printing, making it impractical.

On the other hand, in order to correct the eccentricity of such an eccentric roller, extensive grinding and polishing work is required, which is not a good idea in terms of productivity, dimensional accuracy, cost, etc.

[Problems to be solved by the invention] The present invention has been developed based on the above points, and its purpose is to eliminate the drawbacks of the prior art mentioned above and to speed up the assembly and disassembly of molds. To provide a vertically divided three-part type roller molding die consisting of a lower die, a middle die, and an upper die, which can be made into a roller and which is free from burrs and eccentricity.

[Means for Solving the Problems] The gist of the present invention is to provide a cylindrical medium size, a small diameter part that can be inserted into the lower part of the medium size, and a large diameter part that is integrally fixed to the small diameter part. It consists of a lower mold with a shaft hole passing through the center of the shaft, a small diameter part that can be inserted into the lower part of the medium mold, and a large diameter part that is integrally fixed to the small diameter part. In a vertically split type roller molding mold consisting of an upper mold with a shaft hole passing through the center of the shaft, the ends of the shaft holes of the upper mold and the lower mold are circularly shaped. The roller molding die is characterized in that an alignment pin is inserted therein, and a pin stopper part is provided on the outer end side of the shaft hole to prevent the alignment pin from popping out.

In the present invention, the inner diameter of the shaft hole penetrating along the shaft center of the upper mold and the lower mold is 0.03 mm or more, preferably 0.05 mm or more larger than the outer diameter of the shaft core material of the roller to be molded. Mold assembly can be done quickly,
Appropriate for demolition work.

In the present invention, it is appropriate to provide the raw material injection port on either side of the upper mold or the lower mold.

[Function] The roller molding mold of the present invention has a cylindrical medium mold,
The lower mold consists of a small diameter part that can be inserted into the lower part of the medium mold, and a large diameter part that is integrally fixed to the small diameter part. A vertically divided three-part type consisting of a small diameter part that can be inserted into the lower part, a large diameter part that is integrally fixed to the small diameter part, and an upper mold that has a shaft hole penetrated through the center of the shaft. By using a roller mold, it is possible to achieve high precision during roller molding and completely prevent the occurrence of burrs.Furthermore, the shaft holes of the upper and lower molds each have a circularly shaped tip. By inserting the centering pin and providing a pin stopper on the outer end side of the centering pin to prevent the centering pin from popping out, the core material of the roller to be formed can be aligned quickly and with high precision. This allows the inner circumferential diameter of the shaft holes of the upper and lower molds to be larger than the outer diameter of the shaft center material of the roller to be molded, resulting in a vertically divided three-part type roller consisting of a lower mold, a middle mold, and an upper mold. By speeding up the assembly and disassembly of molding molds, these components work synergistically to produce high-quality, high-precision rollers that completely eliminate eccentricity with high productivity. .

[Example] Next, an example of the roller molding die of the present invention will be described with reference to the drawings.

FIG. 1 is an enlarged explanatory view of a main part showing one embodiment of a roller molding die of the present invention, and FIG. 8 is an enlarged explanatory view of a main part showing another embodiment.

In FIG. 1, reference numeral 4 denotes a shaft hole opened along the axis center line of the upper mold 9 and the lower mold 11;
0 is the centering pin inserted into the shaft hole 4, 21 is the pin stopper part provided at the outer end of the centering pin, and 2 is the shaft center material of the forming roller inserted into the shaft hole 4. , 3 is a center hole provided in the end face of the shaft core material.

In FIG. 1, the distal end of the centering pin 20 is inserted into the shaft hole 4, but the rear end thereof is held by a pin stopper portion 21. The pin stopper portion 21 can be held down by another member.

As shown in FIG. 9, the axes of the shaft holes 4, 4 of the upper mold 9 and lower mold 11 of FIG. Moreover, they can be matched easily.

Therefore, the roller molded using the roller molding die of the present invention has no eccentricity, and high-quality, high-precision rollers can be produced with high productivity.

Since the eccentricity of the shaft core material 2 can be eliminated in this way, the shaft holes 4 of the upper mold 9 and the lower mold 11,
To speed up the assembly and disassembly work of a vertically divided three-part type roller molding mold, which is larger than the outer diameter of the shaft center material 2 of a roller for molding 4, and is composed of a lower mold 11, a middle mold, and an upper mold 9. can be measured.

As a result, in the roller molding die of the present invention, these components work synergistically to produce high-quality, high-precision rollers that completely eliminate eccentricity with high productivity.

FIG. 8 shows another embodiment of the roller molding die of the present invention in which the centering pin 20 is movable.

The roller molding die shown in Fig. 8 has a bearing 23 and a spring 24.
Since it can move in the direction of the arrow, it is possible to check for changes in the position of the end surface 22 of the alignment pin 20, and as a result, it is possible to detect cases where an abnormal force is applied to the shaft core material 2 in the direction of the arrow. be able to.

[Effects of the invention] The roller forming mold of the invention can significantly improve the workability of inserting and aligning the roller core material into the shaft holes of the upper and lower molds, and as a result, eccentricity can be improved. It is possible to produce high-quality, high-precision rollers with high productivity and is industrially useful.

[Brief explanation of drawings]

Fig. 1 is an enlarged explanatory view of the main parts showing one embodiment of the roller molding die of the present invention, Fig. 2 is a roller, Fig. 2 A is its front view, and Fig. 2 B is its right side. Figure 3 is a perspective view of a conventional horizontally split mold, and Figure 4 is a perspective view of a conventional horizontally split mold.
The figure is a partially omitted perspective view of the lower horizontally split mold, No. 5
The figure is an exploded perspective view of a conventional upper/middle/lower split type roller molding die, and Fig. 6 is a longitudinal sectional view thereof.
FIG. 7 is a cross-sectional explanatory diagram showing the misalignment of the conventional upper, middle, and lower split type roller molding mold, and FIG. 8 is another embodiment of the roller molding mold of the present invention. FIG. 9 is an explanatory cross-sectional view showing the alignment state of the roller molding die of the present invention. 1... Roller member, 2... Shaft core material, 3... Center hole, 4... Shaft hole, 5... Inlet, 6... Between mold holes, 7... Upper side split mold, 8... Lower horizontally split mold, 9... Upper mold, 10... Middle mold, 11... Lower mold, 12... Center of shaft core material, 13... Center of shaft hole, 20... Aligning pin , 21... Pin stopper part, 22... Aligning pin end face, 23... Bearing,
24...Spring.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical medium 10, a small diameter part that can be inserted into the lower part of the medium 10, and a large diameter part that is integrally fixed to the small diameter part, and a shaft hole 4 passes through the center of the shaft. It consists of a lower mold, a small diameter part that can be inserted into the lower part of the middle mold 10, and a large diameter part that is integrally fixed to the small diameter part, and a shaft hole 4 passes through the center of the shaft. In a roller molding die of a vertically divided type consisting of an upper die 9 and a lower die 11, the shaft holes 4, 4 of the upper die 9 and the lower die 11 are
Aligning pins 20, 20 each having a conical tip are inserted therein, and the shaft holes 4,
4. A roller molding die characterized in that a pin stopper portion 21 is provided on the outer end side of the centering pins 20, 20 to prevent the alignment pins 20, 20 from popping out.