JP3644646B2 - Conveying roller for recording medium and method for manufacturing the same - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a conveyance roller for a recording medium provided in an information device that reads, outputs, and processes information recorded on a disk-shaped recording medium.
[0002]
[Prior art]
A conventional conveying roller for a recording medium (for example, Japanese Patent Laid-Open No. 63-298761) is shown in FIGS. The transport roller 100 includes an elastomer roller main body 101 and a support shaft 102 that supports the roller main body 101. When the recording medium 103 is inserted between the rotating conveying rollers 100, the recording medium 103 is conveyed by the frictional resistance between the roller body 101 and the recording medium 103.
[0003]
In order to prevent damage to the information recorded on the center side of the recording medium 103 during the conveyance, the roller body 101 has a symmetrical taper with a small diameter at the center in the longitudinal direction and a gradually increasing diameter from the center toward both ends. Thus, only the both ends of the roller main body 101 come into contact with the end of the recording medium 103 to generate a conveying force.
[0004]
FIG. 9 is a cross-sectional view of the manufacturing apparatus A for the roller body 101. The manufacturing apparatus A forms a cavity B by the dies 104 and 105, and injects and cures the fluidized elastomer C into the cavity B. 101 is formed.
[0005]
[Problems to be solved by the invention]
However, in the conventional roller body 101, a longitudinal boundary line Y is generated (protruded) in the roller body 101 corresponding to the parting line X formed by the mating surfaces 106 and 107 of the molds 104 and 105 in the manufacturing process. It was. For this reason, there is a problem in that the shape accuracy of the roller main body 101 in the circumferential direction is lowered and the conveyance failure of the recording medium 103 is caused.
[0006]
SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and provides a conveyance roller for a recording medium having improved shape accuracy in the circumferential direction at both ends of the roller body, that is, a portion that contacts the recording medium, and a method for manufacturing the same. The purpose is that.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention provides a roller body which is provided with a symmetrical taper having a large diameter from the center in the longitudinal direction to both ends, and is integrally formed of an elastomer, and the longitudinal direction of the roller body. And a boundary line corresponding to the parting line of the mold at the time of integral molding.
[0008]
The invention according to claim 2 is a symmetrical shape in which a plurality of molds that can be opened and closed linearly and a parting line of the plurality of molds are opposed to each other and have a large diameter along the opening and closing direction. A plurality of cavity-constituting holes having a taper, and a cavity is formed by closing the plurality of molds, and then a fluidized elastomer is injected into the cavity to be cured. A roller main body having a symmetrical taper having a large diameter from the center in the direction to both ends and having a boundary line around the entire circumference in the center in the longitudinal direction is integrally formed.
[0009]
[Action]
Since the boundary line exists in the center in the longitudinal direction of the roller body, the shape accuracy in the circumferential direction on both ends of the roller body is high.
[0010]
【Example】
INDUSTRIAL APPLICABILITY The present invention is provided in a transport path of information equipment that reads, outputs, processes, etc. information recorded on a disk-shaped recording medium (optical disk, magnetic disk, etc.), such as an audio equipment for automobiles or office equipment. It is for conveying a recording medium.
[0011]
FIG. 1A is a schematic perspective view of the vicinity of the conveyance path D provided with the present invention, and FIG. 1B is a side view. In the figure, reference numeral 1 denotes a disk-shaped recording medium, and various types of information are recorded photoelectrically or magnetically on the center side of the surface of the recording medium 1.
[0012]
A pair of transport rollers 2 is provided horizontally and in parallel on the transport path D. The pair of transport rollers 2 includes a roller main body 3 integrally formed of an elastomer and a metal support shaft 4 that rotatably supports the roller main body 3. The elastomer may be a thermosetting elastomer (silicone, phenol, urea, melamine, unsaturated polyester, epoxy, diallyl phthalate, polyurethane, etc.), or a thermoplastic elastomer (polystyrene, polyolefin). In this embodiment, silicone rubber is selected from thermosetting elastomers. However, in this embodiment, polyvinyl chloride, polyurethane, polyester, polyamide, etc. may be used.
[0013]
The length of the roller main body 3 is set to be equal to or larger than the outer diameter of the recording medium 1, and the tapered portions 5 and 6 having a tapered shape having a large diameter from the center to both ends are arranged in series. The roller body 3 has a circular outer peripheral shape in a radial cross section at any position in the longitudinal direction, and a boundary line E is formed at the center in the longitudinal direction over the entire circumference.
[0014]
FIG. 2 is a schematic cross-sectional view showing a manufacturing apparatus (for example, a main part of a pressure molding machine, an injection molding machine, a transfer molding machine, etc.) F of the conveying roller 2. In FIG. 2, reference numerals 7 to 10 denote a plurality of dies, which are opened and closed in a straight line, that is, in the vertical direction in the drawing by the operation of an actuator (not shown) such as a hydraulic mechanism.
[0015]
The molds 8 and 9 have the same thickness in the opening and closing direction, and have a circular cross section with a symmetrical taper having a large diameter from the mating surfaces 11 and 12 to the mating surfaces 13 and 14 on the opposite side. The tee constituting holes 15 and 16 are separately formed through. The cavity constituting holes 15 and 16 are arranged on the same center line (not shown).
[0016]
The mold 7 is provided with four sprues 17 (two are shown in the figure for convenience) penetrating the positions corresponding to the cavity constituting holes 15 in the thickness direction. The sprue 17 is located on the same circumference around a center line (not shown). A pin 18 is fixed to the mold 10 at a position corresponding to the cavity constituting holes 15 and 16. The protruding amount of the pin 18 is the same as the sum of the thicknesses of the dies 8 and 9.
[0017]
Next, the operation | movement which shape | molds the roller main body 3 with the manufacturing apparatus F is demonstrated. First, a plurality of molds 7 to 10 shown in FIG. 2 are closed as shown in FIG.
[0018]
After that, the fluidized elastomer Z is injected from the sprue 17 into the cavity G and spread, and the roller body 3 as shown in FIG. At the time of molding, the roller body 3 is formed with a symmetrical taper having a small diameter at the center in the longitudinal direction and a large diameter from the center to both ends. In addition, a boundary line E is generated around the entire circumference of the center of the roller body 3 corresponding to the parting line H of the mating surfaces 11 and 12, and a shaft hole 23 is formed by the pin 18.
[0019]
After the molding of the roller body 3, first, as shown in FIG. 5, when the molds 7 and 10 are opened in the vertical direction in the figure, the sprue 19 engaged with the mold 7 is torn off from the roller body 3. Next, as shown in FIG. 6, the molds 8 and 9 are simultaneously opened by the same amount. Then, elastic deformation (contraction) occurs along the shape of the cavity constituting holes 15 and 16 in a state where both ends of the taper portions 5 and 6 constituting the roller body 3 are separately supported by the engaging force with the molds 8 and 9. Therefore, the taper portions 5 and 6 come out of the cavity constituting holes 15 and 16 by equal amounts, and finally, the roller body 3 is completely released from the molds 8 and 9.
[0020]
When the conveyance roller 2 according to this embodiment is rotated as shown in FIG. 1 and the recording medium 1 is inserted therebetween, the recording medium 1 is conveyed by the frictional resistance between the roller body 2 and the recording medium 1. At the time of this conveyance, as shown in FIG. 1B, only the both ends of the roller main body 3 come into contact with the end of the recording medium 1 to generate a conveyance force, so that the information recorded on the recording medium 1 can be prevented from being damaged.
[0021]
During this conveyance, since the boundary line E is in the center in the longitudinal direction of the roller body 3, the shape accuracy in the circumferential direction at both ends of the roller body 3 is high, and the conveyance property to the recording medium 1 is good.
[0022]
Moreover, since the roller main body 3 is integrally formed using the manufacturing apparatus F, there is no adhesion part, and manufacturing cost and manufacturing time can be suppressed, and manufacturing cost can be reduced.
If a plurality of sets of sprues 17, cavity constituting holes 15, 16 and pins 18 are provided in the molds 7 to 10 of the manufacturing apparatus F shown in FIGS. 2 to 6, a plurality of rollers can be formed in one molding operation. Of course, the main body 3 can be molded.
[0023]
FIG. 7A is a perspective view illustrating a conveyance roller 30 according to another embodiment. The transport roller 30 has a roller body 31 integrally formed of an elastomer and a support shaft 4 that supports the roller body 31.
[0024]
The roller body 31 includes a straight portion 32 provided at the center in the longitudinal direction and a tapered portion 33 provided with a symmetrical taper having a large diameter from the straight portion 32 to both ends. A boundary line J is formed on the entire circumference of the center of the straight portion 32 in the longitudinal direction.
[0025]
Other configurations, manufacturing methods, and effects are the same as those of the transport roller 2 shown in FIG. In addition, as for the metal mold | die (not shown) which shape | molds the conveyance roller 30, of course, the cavity structure hole becomes a shape corresponding to the straight part 32. FIG.
[0026]
FIG. 7B is a perspective view showing a conveying roller 40 according to still another embodiment. The transport roller 40 has a roller body 41 integrally formed of an elastomer and a support shaft 4 that supports the roller body 41.
[0027]
The roller body 41 has a tapered portion 42 provided with a symmetrical taper having a large diameter from the center in the longitudinal direction to both ends. A boundary line K is formed on the entire circumference of the center of the roller body 41 in the longitudinal direction. Further, the roller main body 41 has a hexagonal cross-sectional shape in the radial direction at any position in the longitudinal direction. The roller body 41 rotates intermittently by a predetermined angle and intermittently conveys the recording medium.
[0028]
Other configurations, manufacturing methods, and effects are the same as those of the transport roller 2 shown in FIG. Of course, a mold (not shown) for forming the transport roller 40 has a cavity-constituting hole corresponding to the straight portion 42. The cross-sectional shape of the roller body may be another polygon. Further, although a synthetic resin may be used as the elastomer, since the amount of elastic deformation is very small compared to the synthetic rubber, it is important to set the taper of the roller body at an angle at which it can be released from the mold.
[0029]
【The invention's effect】
As described above, since the boundary line exists in the center of the longitudinal direction of the roller main body, the invention according to the first aspect and the second aspect of the invention can improve the shape accuracy in the circumferential direction on both ends of the roller main body. Can be transported to the recording medium.
[Brief description of the drawings]
FIG. 1A is a schematic perspective view of the vicinity of a conveyance path provided with a conveyance roller according to the present invention;
(B) is a side view of a state in which the recording medium is conveyed by the conveying roller of the present invention.
FIG. 2 is a cross-sectional view showing a manufacturing apparatus for manufacturing a transport roller according to the present invention before a plurality of molds are closed.
FIG. 3 is a cross-sectional view showing a state where a plurality of molds are closed and an elastomer is injected into a cavity in the manufacturing apparatus of the present invention.
FIG. 4 is a cross-sectional view of a state in which a roller body is formed by curing an elastomer in a cavity in the manufacturing apparatus of the present invention.
FIG. 5 is a cross-sectional view showing a state in which two molds are opened after forming a roller body in the manufacturing apparatus of the present invention.
FIG. 6 is a cross-sectional view of a state in which all the molds are opened after the roller body is molded and the roller body is released from the mold in the manufacturing apparatus of the present invention.
FIG. 7A is a perspective view showing a conveyance roller according to another embodiment of the present invention,
(B) is a perspective view showing a conveyance roller according to still another embodiment of the present invention.
FIG. 8A is a schematic perspective view of the vicinity of a conveyance path provided with a conventional conveyance roller;
(B) is a side view of a state in which a recording medium is conveyed by a conventional conveying roller.
FIG. 9 is a cross-sectional view of a state in which a roller body is formed by a conventional manufacturing apparatus.
[Explanation of symbols]
7, 8, 9, 10 Die 3, 31, 41 Roller body 15, 16 Cavity hole Z Elastomer E, J, K Boundary line G Cavity H Parting line

Claims (2)

A roller body which is symmetrically tapered with a large diameter from the center in the longitudinal direction to both ends and is integrally formed with an elastomer, and is provided on the entire circumference of the center in the longitudinal direction of the roller body. And a boundary line corresponding to the parting line of the mold. A plurality of molds that can be opened and closed in a straight line, and a plurality of cavities that are arranged opposite to each other across the parting lines of the molds and that are provided with symmetrical tapers that have a large diameter along the opening and closing direction. And forming a cavity by closing the plurality of molds, and then injecting and curing a fluidized elastomer into the cavity, thereby increasing the diameter from the center in the longitudinal direction to both ends. A method for producing a conveyance roller for a recording medium, comprising: integrally forming a roller body provided with a symmetrical taper and having a boundary line around the entire circumference in the center in the longitudinal direction.

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