JP3539162B2 - Manufacturing method and manufacturing apparatus for magnet roll - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for manufacturing a magnet roll used for an electrophotographic developing device such as a copying machine, a facsimile, a printer, and a magnet roll used for other purposes. .
[0002]
[Prior art]
As a method and an apparatus for manufacturing the magnet roll, for example, as shown in Japanese Patent Application No. 8-335463 previously proposed by the present applicant, an injection port for injecting a molten magnet material into one end is provided. By using a cylindrical main mold provided with a mold composed of a slide mold movably disposed in the main mold, uniform magnetic properties in the longitudinal direction of the formed magnet roll can be achieved. Dimensional accuracy, warpage, etc. can be improved.
[0003]
By the way, at least one of the shaft portions formed at both ends of the magnet roll is provided with a notch portion for positioning or driving force transmission. When viewed from the end of the magnet roll, the shaft portion has a notch. It has a shape cut into a mold, a so-called D-cut shape. The standard of the magnet roll is determined by the positional relationship between the position of the notch and each magnetic pole position (magnetic pattern) of the roll body. The specifications of the magnet roll are not limited to one type, but may be many types. In such a case, the position of the notch and the position of each magnetic pole (magnetic pattern) of the roll body are determined. Various types of dies with different positional relationships are prepared, and each time they are replaced with the required dies. Further, by changing the relative position of the slide die forming the shaft with respect to the main forming die forming the roll main body of the magnet roll, the roll main body and the shaft are brought into a set positional relationship.
Here, the D-cut shape has been described as an example of the shaft end portion shape. However, a shape other than the D-cut shape, for example, a polygonal shape, a groove, or the like, may be used as long as the shape allows positioning and transmission of driving force.
[0004]
In the case of preparing the former various types of molds, not only is it disadvantageous in terms of cost, but also the work of replacing the molds is troublesome and troublesome. When changing the relative position of the slide mold with respect to the main mold, the holding of the slide mold held by the position holding means with respect to the main mold is released, and then the relative position of the slide mold with respect to the main mold is changed. Since the position of the slide mold is changed and adjusted, and the position of the slide mold is again held by the position holding means, the work of changing the position of the slide mold requires a great deal of labor and cost.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned circumstances, and aims to solve the problem so that it is possible to easily and quickly change the positional relationship of the shaft portion with respect to the main molding die, and to realize without changing the cost. Is to do.
[0006]
[Means for Solving the Problems]
The present invention provides a method for manufacturing a magnet roll including a roll body and shafts located at both ends of the roll body, for solving the above-mentioned problem, wherein the shaft for forming the at least one shaft is provided. By rotating at least one of a mold (end molding die, slide mold) and a main mold for forming the roll body, the relative position between the shaft and the roll body can be changed. It is possible to change the positional relationship between the position of the notch formed in the shaft and each magnetic pole position (magnetic pattern) of the roll body.
[0007]
A magnet roll manufacturing apparatus for forming a magnet roll composed of a roll body portion and shaft portions located at both ends of the roll body portion, wherein a shaft portion mold for forming the at least one shaft portion is provided, The shaft mold is provided rotatably with respect to the main mold for forming the roll main body, or the main mold is provided rotatably with respect to the shaft mold, and the main mold and the shaft mold are provided. Providing a detecting means for detecting a relative position with the mold, and providing a driving means for driving and rotating at least one of the shaft mold and the main mold based on the relative position information from the detecting means, Established manufacturing equipment for magnet rolls.
In other words, the relative position between the main mold and the shaft mold can be changed by driving and rotating the shaft mold or the main mold or both molds. By driving the driving means based on the relative position information from the detecting means for detecting the relative position of the main mold, the relative position between the main mold and the shaft mold can be changed quickly and reliably.
[0008]
By configuring one of the two shaft molds as a slide mold that is disposed in the main mold so as to be able to move back and forth, and by providing a means for changing the retreat position of the slide mold, The length of the magnet roll in the axial direction can be made freely, and the length of the roll body can be easily changed.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The configuration of the magnet roll integrated with a magnet material and a manufacturing apparatus for forming the same will be described.
FIG. 1 shows a magnet roll formed by using the manufacturing apparatus of the present invention. The magnet roll 1 is formed by projecting shaft portions 3 and 4 having reduced diameters at both ends of a roll body 2 having a circular cross section, A notch 5 for positioning or driving force transmission is formed in the shaft portion 3, that is, the shaft portion 3 is formed in a so-called D-cut shape when viewed from the front, and is integrally formed using a magnet material. In addition, as the magnet roll 1, the roll portion 2 is not a cylinder but a polygonal pillar, the other shaft portion 4, or the notch portion 5 formed on both the shaft portions 3 and 4, or the magnet roll 1 The present invention can be similarly applied to a case in which the shaft center and the shaft centers of the shaft portions 3 and 4 are intentionally decentered.
[0010]
The magnet material constituting the magnet roll 1 is mainly composed of a magnetic powder and a binder for binding the magnetic powders, and a silane or titanate coupling agent for strengthening the binding, and a fluidity. It is a mixture containing a small amount of a lubricant to improve the performance, a stabilizer to prevent the thermal decomposition of the binder, etc.It is also possible to mix a flame retardant and a reinforcing agent if necessary. (SmCo-based, NdFeB-based), MnAIC-based, Alnico-based, SmFeN-based, and the like. As the binder, a thermoplastic resin, a thermosetting resin, a low melting point alloy, or the like can be used.
[0011]
The magnet roll 1 is used as a developing roll and a cleaning roll in an electrophotographic developing device such as a copying machine, a facsimile, and a printer, but can be used for other purposes.
[0012]
Next, an apparatus for manufacturing the magnet roll 1 will be described.
As shown in FIG. 2, a cylindrical fixed-side main mold 6 for forming the roll main body 2 of the magnet roll 1, which is disposed at one end of the main mold 6, An end forming die 7 as one shaft portion mold for forming the shaft portion 3, and is disposed in the main forming die 6 so as to be able to move back and forth, and is formed by the main forming die 6. Along with the filling of the molten magnet material into the molding space 9, the slide die 8 moves to the retreat side to form an end of the magnet roll 1, that is, the other shaft die for forming the shaft 4. Constitutes a mold for forming a magnet roll. Magnetic field orienting means 10 for aligning the direction of the magnetic particles during a period until the molten magnet material provided in the main mold 6 and filled in the molding space 9 is solidified is provided. As the magnetic field orienting means 10, various existing structures such as a permanent magnet, an electromagnet, or a combination thereof can be adopted. The molten magnet material is supplied from an injection cylinder (not shown) into the molding space 9 via the injection port 11 shown in the figure.
[0013]
A retreat position detecting means 12 for detecting the retreat position of the slide die 8 is provided, and setting information from the retreat position setting means 13 for setting the retreat position of the slide die 8 and detection information from the retreat position detecting means 12 Is provided so as to control the actuator 14 so that the magnet rolls 1 having different lengths can be formed without changing the main forming die 6. As the actuator 14, for example, an air compressor, a hydraulic cylinder, a pneumatic cylinder, a screw screw, a rack and pinion gear, a linear motor, or the like can be used. The magnet rolls 1 having different lengths may be formed by replacing the main forming dies 6 having different lengths without controlling the retreat position of the slide die 8.
[0014]
The retreat position detecting means 12 is configured to directly detect the position of the slide die 8 by a contact type or non-contact type sensor, and to determine the drive position of the actuator 14 for moving the slide die 8 by a contact type or non-contact type. The position of the slide die 8 may be indirectly determined by detecting with a contact-type sensor.
[0015]
A rotating shaft 16 protrudes from an end face of the end forming die 7, a large-diameter gear 17 is fixed to the rotating shaft 16, and a driving shaft 19 </ b> A of an electric motor 19 is connected to a small-diameter gear 18 that meshes with the large-diameter gear 17. By coupling, the end forming die 7 is configured to be rotatable around the axis X in the longitudinal direction of the magnet roll 1. Further, a light transmission type photo interrupter 20 for detecting the rotation angle of the large-diameter gear 17 is provided to constitute a detecting means for detecting the relative position of the end molding 7 with respect to the main molding 6. Further, setting information from the relative position setting means 21 is input to the control device 15, and the setting information is input to the control device 15 by the setting information from the relative position setting means 21. The electric motor 19 is driven such that the end molding die 7 is rotated to the position where the end molding die 7 is rotated. The detecting means may be constituted by another non-contact type sensor, or may be constituted by a contact type sensor in addition to the photo interrupter. In addition, by configuring the electric motor 19 by a step motor, the detection means can also be configured by a step motor.
[0016]
Next, a method for manufacturing the magnet roll 1 will be described.
First, the control device 15 determines whether or not the setting information from the relative position setting means 21 and the detection information from the relative position detecting means 20 match. If they match, the next step is performed. If it is determined that they do not match, the electric motor 19 is driven to match the two information, and then the process proceeds to the next step. Next, as shown in FIG. 3, the actuator 14 is driven to move the slide die 8 to the forward position. Thereafter, as shown in FIG. 4, the injection cylinder is driven to inject and inject the molten magnet material into the molding space 9 through the injection port 11, and the resultant force of the injection pressure of the molten magnet material and the driving force by the actuator 14 is applied. The molding space 9 is filled with the molten magnet material while the slide die 8 is retracted to the retracted position. At this time, it is determined from the detection information from the retreat position detecting means 12 whether or not the slide die 8 is located at the retreat position supported by the retreat position setting means 13. Is stopped, and the slide die 8 is stopped at that position. When a hydraulic cylinder is used as the actuator 14, the working oil is leaked while being squeezed, thereby applying a braking force to the backward movement of the slide die 8, thereby filling the molding space 9 with the molten magnet material without gaps. It becomes possible to go. However, a braking force applying means for applying a braking force by friction or the like may be provided to apply the braking force when the slide die 8 moves backward. Further, the slide die 8 may be retracted while applying a braking force by the actuator according to the injection injection speed of the molten magnet material. Further, when the molten magnet material is filled, the driving by the actuator may be stopped. During the period until the molten magnet material filled in the molding space 9 is solidified, the directions of the magnetic particles are aligned by the magnetic field orientation means 10.
[0017]
Next, as shown in FIG. 5, after the injected and injected molten magnet material is solidified, the main mold 6 is moved away from the end mold 7, and then the slide mold 8 is advanced to move the magnet roll 1 to the position. Let go. The end molding die 7 may be moved away from the main molding die 6.
[0018]
In the above embodiment, the end forming die 7 for forming the notch 5 of the shaft is rotated. However, as shown in FIG. Means that the slide die 8 is rotated. Specifically, a rotation driving means 22 is provided from an electric motor or the like for rotating the slide die 8, and a relative position detection means 23 for detecting a relative position of the slide die 8 with respect to the main molding die is provided. The drive signal is output from the control device 15 to the rotation drive means 22 so that the detection information from the means 23 matches the setting information from the relative position setting means 21. The relative position detecting means 23 may be constituted by a non-contact type or contact type sensor for detecting the rotational position of the slide die 8. Although not shown, when the notch 5 of the shaft portion is formed in the end molding die 7 and the slide die 8, the main molding die 6 may be rotated, or the end molding die may be rotated. The rotary operation of the slide die 7 and the slide die 8 may be performed. Further, in order to quickly perform the rotational position alignment, a plurality of dies among the three dies 6, 7, 8 may be simultaneously rotated. Further, the main molding die 6 and the end molding die 7 may be integrated and implemented. Further, the main mold 6 may be constituted by two split molds.
[0019]
Further, in the above embodiment, the shaft portion and the roll portion are integrally formed, but the present invention is applicable to a shaft insert type magnet roll in which a metal or synthetic resin shaft is inserted. Can be. In the above-described embodiment, the slide die 8 and the end molding die 7 are controlled to rotate based on the detection information from the relative position detection means 23 and the setting information from the relative position setting means 21. A reference position is marked on the outer peripheral surface of the main molding die 6, and graduations for the reference position are marked on the outer peripheral surfaces of the slide die 8 and the end molding die 7, so that these marks and the graduation are at desired positions. By driving an electric motor or the like so as to establish a relationship, the relative position detecting unit 23 and the relative position setting unit 21 may be omitted to implement the present invention.
[0020]
【The invention's effect】
According to the first aspect, the position of the notch formed in the shaft and the position of each magnetic pole position (magnetic pattern) of the roll body by rotating the shaft mold, the main mold, or both molds. Relationships can be changed. And, the change is disadvantageous in terms of cost due to the exchange of the mold as in the conventional case, the trouble of releasing the position holding of the slide mold held in position with respect to the main mold, and the slide for the main mold. This can be realized while simultaneously resolving the difficulty of the mold position changing operation and the like.
[0021]
According to the second aspect, the driving means is driven by the relative position information from the detecting means for detecting the relative position between the main mold and the shaft part mold, so that the main mold and the shaft part are quickly and surely and reliably. When the relative position with respect to the mold can be changed, and various types of magnet rolls are formed in which the positional relationship between the position of the notch formed in the shaft and the position of each magnetic pole (magnetic pattern) of the roll body is different. Is particularly advantageous.
[0022]
According to the third aspect, by changing the retreat position of the slide mold, the length of the roll body can be changed, and it is not necessary to replace a mold for the roll body having a different length. The molding operation can be performed quickly. Further, by filling the molten magnet material while the shaft die is retracted, the molten magnet material can be filled into the molding space without any gap.
[Brief description of the drawings]
FIG. 1 is a perspective view of a magnet roll integrated with a magnet material.
FIG. 2 is a cross-sectional view schematically showing a manufacturing apparatus according to the present invention.
FIG. 3 is a schematic cross-sectional view of a molding apparatus showing a state immediately before a molten magnet material is injected into a molding space.
FIG. 4 is a schematic cross-sectional view of the molding apparatus showing a state where the injection of the molten magnet material is completed.
FIG. 5 is a schematic cross-sectional view of a molding apparatus showing a state where a magnet roll molded from a mold is detached.
FIG. 6 is a schematic sectional view showing another embodiment of the manufacturing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Magnet roll 2 Roll main body part 3 Shaft part 4 Shaft part 5 Notch part 6 Main molding die 7 End molding die 8 Slide die 9 Molding space 10 Magnetic field orienting means 11 Inlet 12 Retreat position detecting means 13 Retreat position setting means 14 Actuator Reference Signs List 15 control device 16 rotating shafts 17, 18 gear 19 electric motor 19A drive shaft 20 photo interrupter (detection means)
21 relative position setting means 22 rotation driving means 23 relative position detecting means X axis

Claims (3)

A method of manufacturing a magnet roll comprising a roll body and shafts located at both ends of the roll, wherein a shaft mold for forming the at least one shaft and a roll body for forming the roll body. A method of manufacturing a magnet roll in which the relative position between a shaft portion and a roll body portion can be changed by rotating at least one of a main mold. A magnet roll manufacturing apparatus for forming a magnet roll composed of a roll body and shafts located at both ends of the roll body, wherein a shaft part mold for forming the at least one shaft is provided. The shaft mold is provided rotatably with respect to the main mold for forming the roll body, or the main mold is provided rotatably with respect to the shaft mold, and the main mold and the shaft mold are provided. A detecting means for detecting a relative position with respect to the mold is provided, and a driving means for driving and rotating at least one of the shaft mold and the main mold based on the relative position information from the detecting means is provided. Manufacturing equipment for magnet rolls. By forming one of the two shaft molds as a slide mold that is disposed in the main mold so as to be able to move back and forth, and by providing means for changing the retreat position of the slide mold, 3. The magnet roll manufacturing apparatus according to claim 2, wherein the length of the magnet roll in the axial direction can be freely adjusted.

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