JP4235072B2 - Mold for molding magnet rollers - Google Patents

Description

  The present invention relates to a molding die for a magnet roller for molding a magnet roller incorporated in an image forming apparatus such as a copying machine, a printer, a facsimile machine, or the like.

  A magnet roller incorporated in an image forming apparatus using powder toner in a copying machine, a printer, a facsimile machine, or the like is generally composed of a cylindrical roller body and shafts integrally provided at both ends of the roller body. ing.

  The outer periphery of the roller main body is magnetized by being divided into a plurality of poles, and has the function of developing the toner by uniformly applying the developing toner to the photosensitive drum or belt to which the latent image is transferred. Therefore, in order to develop a clear image, it is necessary to apply the toner as uniformly as possible. For this purpose, the roller body must be uniformly magnetized. Of course, the magnetization of the magnet roller is uniform, but it is important that the positional relationship between the roller body of the magnet roller and the photosensitive drum or belt is parallel. That is, when the magnet roller is slightly warped or decentered, parallelism cannot be maintained in the positional relationship, and uniform development cannot be performed.

  When the magnet roller is formed by injection molding, a split mold method shown in FIG. 6A and a vertical punching method shown in FIG. In the split mold method, the cavity 4 is provided so that the split surfaces 1 a and 2 a of the fixed mold 1 and the movable mold 2 are along the axial direction of the magnet roller 3. That is, the roller body molding cavity 5 and the shaft molding cavity portion 6 of the magnet roller 3 are provided along the split surfaces 1 a and 2 a of the fixed mold 1 and the movable mold 2.

  The vertical punching method includes a fixed mold 7 and a movable mold 8, and the movable mold 8 has a roller body molding cavity 9 of the magnet roller 3 along the axial direction in the moving direction of the movable mold 8. Is provided. Further, one shaft portion 3 b of the main body portion 3 a of the magnet roller 3 is formed by the shaft forming cavity portion 9 a of the fixed die 7, and the other shaft portion 3 c is formed by the shaft forming cavity portion 9 b of the movable die 8. It is like that. Further, the fixed mold 7 is provided with a plurality of guide pins 10a, and the movable mold 8 is provided with a guide hole 10b that fits into the guide pins 10a.

  In the split mold, the roller body molding cavity 5 and the shaft molding cavity 6 forming the main body 3a and the shaft 3b of the magnet roller 3 are divided into the fixed mold 1 and the movable mold 2. Since it is provided along the surfaces 1a and 2a, the axis of the main body 3a of the magnet roller 3 and the axis of the shafts 3b and 3c can be aligned with relatively high accuracy.

  The vertical punching molding die is provided with a shaft molding cavity portion 9 a for molding one shaft portion 3 b of the main body portion 3 a of the magnet roller 3 in the fixed die 7, and the movable die 8 is a roller of the magnet roller 3. A body molding cavity 9 is provided. Accordingly, the positional deviation occurs due to processing errors of component parts, wear of the guide pins, etc., and it is difficult to align the central axes of the main body 3a and the shaft 3b of the magnet roller 3.

  The present invention has been made paying attention to the above circumstances, and its object is to provide a shaft forming cavity portion for forming a shaft portion of a magnet roller provided in a fixed die and a magnet provided in a movable die. To provide an injection mold for a magnet roller in which the relative positioning of the roller with the roller body molding cavity can be accurately performed, and the center axis of the magnet roller body and the shaft can be aligned. It is in.

  In order to achieve the above-described object, the present invention provides a fixed mold, a movable mold that can be moved forward and backward with respect to the fixed mold, and the fixed mold and the movable mold that are coaxial with each other. A cavity block having shaft forming cavities provided opposite to each other and forming shafts at both ends of the magnet roller, at least the movable die having a roller body forming cavity portion of the magnet roller, and the fixed mold Alternatively, it is provided on at least one of the movable molds, and the cavity block is moved and adjusted in a direction perpendicular to the axis of the roller body molding cavity with respect to the mold to thereby shift the axis of the roller body molding cavity. The present invention provides a magnet roller molding die including an adjustment mechanism for adjusting an axial misalignment.

According to a second aspect of the present invention, there is provided a fixed mold, a movable mold that is movable forward and backward with respect to the fixed mold, and a roller that is provided on a split surface between the fixed mold and the movable mold and that forms a roller body portion of a magnet roller a cavity block having an axial mold cavity for molding the shaft portion of the cavity block and ends having a body molding cavity portion, provided on at least one of the stationary mold and the movable mold, having a shaft shaped cavity A magnet roller molding comprising: an axis misalignment adjusting mechanism that adjusts a deviation of an axis from the axis of the roller body molding cavity by moving and adjusting a cavity block in a direction perpendicular to the axis of the cavity block. In the mold.

  According to a third aspect of the present invention, the shaft misalignment adjusting mechanism according to the first or second aspect is disposed around the cavity block and has an eccentric cam having a cam surface that presses the outer peripheral surface of the cavity block in the axial direction. It is an operation part which rotates this eccentric cam, It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, the shaft misalignment adjusting mechanism according to the first aspect is disposed around the cavity block, the wedge-shaped block pressing the outer peripheral surface of the cavity block in the axial direction, and the adjustment for moving the wedge-shaped block forward and backward. It is an operation part having a screw.

  A fifth aspect of the present invention is characterized in that the operation section according to the fourth aspect is provided on the front surface of the movable mold and can be operated from the front surface side of the movable mold.

  According to the present invention, the relative positioning of the roller main body forming cavity portion and the shaft forming cavity portion of the magnet roller can be easily and accurately performed, and the center axis of the main body portion and that of the shaft portion are aligned with each other. It is possible to provide an injection mold of a magnet roller that can form a roller.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a first embodiment of a magnet roller molding die, FIG. 1 is a longitudinal side view of the molding die, and FIG. 2 is a front view of a movable die. As shown in FIGS. 1 and 2, the molding die for the magnet roller includes a fixed die 11 and a movable die 12 that can move forward and backward with respect to the fixed die 11. A plurality of guide pins 13 project from the dividing surface side of the fixed mold 11, and a guide hole 14 that fits the guide pin 13 is provided on the dividing surface side of the movable mold 12. Then, when the fixed mold 11 and the movable mold 12 are clamped, the guide pin 13 and the guide hole 14 are fitted to be positioned.

  First, the fixed mold 11 will be described. The fixed mold main body 15 is provided with a sprue bush 17 having a nozzle touch surface 16 for joining with a nozzle of an injection molding machine (not shown) for injecting a molten resin magnet material. . In this embodiment, the sprue bush 17 is connected to a hot runner manifold 19 having resin passages 18a and 18b branched to the left and right.

  The hot runner manifold 19 is provided with hot runner nozzles 20a and 20b corresponding to the resin passages 18a and 18b. The hot runner nozzles 20a and 20b are advanced and retracted by a hydraulic cylinder 21, and needle valves 22 for opening and closing the nozzle ports are provided. Is provided.

  The mold material 23 provided on the dividing surface side of the fixed mold body 15 is provided with magnet molding shaft forming cavities 24a and 24b corresponding to the hot runner nozzles 20a and 20b, and the periphery of the shaft forming cavities 24a and 24b. Is provided with a cooling water channel 25. Further, a heat insulating material 26 is provided between the shaft forming cavities 24a and 24b and the hot runner nozzles 20a and 20b.

  Next, the movable mold 12 will be described. The movable mold body 27 is provided with a pair of left and right cavity blocks 28a, 28b corresponding to the pair of left and right shaft forming cavities 24a, 24b of the fixed mold 11. . Since these cavity blocks 28a and 28b have the same structure, one of them (cavity block 28a) will be described. The roller body molding cavity 29 of the magnet roller 3 has its axis parallel to the moving direction of the movable mold 12. Is provided.

  The cavity block 28 a has a cylindrical shape and is fitted into a cylindrical cavity portion 27 a provided in the movable mold body 27. The outer peripheral surface of the base end portion of the cavity block 28a is closely fitted into the cavity portion 27a of the movable mold body 27, and the other outer peripheral surface except the base end portion of the cavity block 28a is the cavity portion of the movable mold body 27. The diameter is slightly smaller than 27a. Accordingly, a gap g is formed on the outer peripheral surface of the cavity block 28a, and the opening edge side of the cavity block 28a can move in the radial direction by the gap g. Further, the roller body molding cavity 29 is open on the dividing surface side of the movable mold body 27, and the opening edge is chamfered in a tapered shape.

  A shaft forming cavity 30 is provided at the other end of the roller body forming cavity 29, that is, at the end opposite to the shaft forming cavity 24 a at one end provided in the fixed mold 11. The shaft forming cavity portion 30 is composed of a cylindrical slide die 31 that can advance and retreat in the axial direction of the roller body forming cavity portion 29, and a protruding pin 32 that can advance and retreat in the axial direction about the axis of the slide die 31. Yes.

  Therefore, the cavity of the magnet roller 3 includes a roller body forming cavity portion 29 provided in the movable die 12, a shaft forming cavity portion 24 a provided in the fixed die 11, and a shaft forming cavity provided in the movable die 12. Part 30.

  Further, magnetic field generating permanent magnets 33 are arranged radially on the outer periphery of the roller body molding cavity 29 provided in the movable mold 12, and a cooling water channel 34 is provided between the magnetic field generating permanent magnets 33. ing.

  Also, a plurality of movable mold main bodies 27 located on the outer periphery of the cavity block 28a, in this embodiment, four eccentric cams 35 serving as axial misalignment adjusting mechanisms are provided at equal intervals in the circumferential direction. The eccentric cam 35 is provided with a tool engaging portion 35c such as a hexagonal cap nut as an operation portion on a rotating shaft 35b having a cam surface 35a that presses the outer peripheral surface of the cavity block 38a in the axial direction. The tool engaging portion 35 c faces the dividing surface side of the movable mold body 27 so that the operator can operate the eccentric cam 35 from the dividing surface side of the movable mold body 27.

  Further, an eccentric gauge 36 is detachably inserted into the opening of the roller body molding cavity 29 of the cavity block 28a. An insertion shaft 36a of the eccentric gauge 36 is closely inserted into the opening of the roller body forming cavity 29, and a cross-shaped index 36c is provided on the head 36b. On the other hand, 37 is a microscope for an operator to observe, and is detachably fixed to a part of the movable mold body 27. Then, by observing the index 36c of the eccentric gauge 36 with the microscope 37, the eccentric direction and the eccentric amount of the roller body molding cavity 29 of the cavity block 28a can be measured with respect to the shaft molding cavity 24a of the fixed mold 11. It has become.

  Next, the operation of the first embodiment will be described.

  Before molding the magnet roller, it is necessary to first position the axis of the shaft molding cavity 24a provided in the fixed mold 11 and the axis of the roller body molding cavity 29 provided in the movable mold 12. There is. Therefore, the movable mold 12 is moved backward with respect to the fixed mold 11 and is set in a state where the dividing surfaces are separated.

  Therefore, the insertion shaft 36 a of the eccentric gauge 36 is inserted into the opening of the roller body molding cavity 29 provided in the movable mold 12. Then, the operator observes the index of the eccentric gauge 36 with the microscope 37 and measures the eccentric direction and the eccentric amount of the roller main body forming cavity portion 29 with respect to the shaft forming cavity portion 24 a of the fixed mold 11.

  Next, a plurality of eccentric cams 35 arranged on the outer periphery of each of the cavity blocks 28a and 28b provided in the movable mold 12 are rotated based on the measurement result of the eccentric direction and the eccentric amount of the roller main body forming cavity portion 29. Then, the axis of the roller body forming cavity 29 is adjusted so as to coincide with the axis of the shaft forming cavity 24 a of the fixed mold 11.

  In this case, when the tool is engaged with the tool engaging portion 35c of each eccentric cam 35 and rotated, the cam surface 35a moves forward or backward with respect to the axis of the cavity block 28a. Therefore, one eccentric cam 35 is rotated across the axis of the cavity block 28a, and is advanced with respect to the axis of the cavity block 28a, and the other eccentric cam 35 is rotated, so that the axis of the cavity block 28a is rotated. Retreat.

  In this way, the opening edge side of the cavity block 28a moves in the radial direction by the gap g formed on the outer peripheral surface of the cavity block 28a, and the axis of the roller body molding cavity 29 is the axis of the shaft molding cavity 24a. Can match with the heart. In addition, since the cavity block 28a is constrained by the plurality of eccentric cams 35, the cavity block 28a is moved in the radial direction after aligning the axis of the roller body forming cavity 29 with the axis of the shaft forming cavity 24a. Never move. Accordingly, by moving the movable mold 12 forward to the fixed mold 11, the guide pins 13 and the guide holes 14 can be fitted to clamp the fixed mold 11 and the movable mold 12.

  Therefore, a highly accurate magnet roller 3 in which the axis of the main body 3a of the magnet roller 3 and the axis of the shafts 3b and 3c are coincident can be formed, and the core generated by processing errors of component parts, wear of guide pins, etc. Misalignment can be prevented.

  Further, since the eccentric cams 35 are independently arranged in the cavity blocks 28a and 28b, the axis of the roller body forming cavity 29 of each of the cavity blocks 28a and 28b is used as the axis of the shaft forming cavity 24a. Can be matched. Moreover, since the tool engaging part 35c of the eccentric cam 35 is provided facing the dividing surface of the movable mold 12, the operation direction is the same direction, and the operability can be improved.

  FIG. 3 shows a second embodiment, and FIG. 3 is a longitudinal side view of the movable mold. The same components as those in the first embodiment are given the same reference numerals, and description thereof is omitted. The movable mold body 27 located on the outer periphery of the cavity block 28a is provided with a plurality of wedge-shaped blocks 40 serving as a mechanism for adjusting the axial misalignment in the circumferential direction, and FIG. 4 shows one of them.

  The wedge-shaped block 40 has a guide surface 40a formed of a flat surface on the outer surface, an inclined surface 40b on the inner surface, and a screw hole 40c provided in the central portion in parallel with the moving direction of the movable mold 12. The wedge-shaped block 40 is housed in a recessed portion 41 provided in the movable mold body 27 so as to be able to advance and retreat, and the inclined surface 40b is slidably joined to the inclined surface 42 provided on a part of the outer peripheral surface of the cavity block 28a. Has been.

  A through hole 43 facing the screw hole 40c is formed in the dividing surface of the movable mold body 27 facing the wedge-shaped block 40, and the adjusting screw having a screw portion 44a screwed into the screw hole 40c. 44 is inserted. A tool engagement portion 44 b as an operation portion is provided at the base end portion of the adjustment screw 44. The tool engaging portion 44 b faces the dividing surface side of the movable mold body 27 so that the operator can operate the adjustment screw 44 from the dividing surface side of the movable mold body 27.

  According to the present embodiment, as in the first embodiment, after measuring the eccentric direction and the amount of eccentricity of the roller main body forming cavity portion 29 with respect to the shaft forming cavity portion 24a of the fixed mold 11, the roller main body forming cavity portion 29 is measured. On the basis of the measurement results of the eccentric direction and the eccentric amount, the plurality of wedge-shaped blocks 40 arranged on the outer periphery of the respective cavity blocks 28a and 28b provided in the movable mold 12 are advanced and retracted so that the shaft of the roller main body forming cavity portion 29 is moved forward and backward. Adjustment is made so that the center coincides with the axis of the shaft forming cavity portion 24 a of the fixed mold 11.

  In this case, when the tool is engaged with the tool engaging portion 44b of each wedge-shaped block 40 and rotated, the rotational motion becomes a linear motion due to the screw engagement between the screw portion 44a of the adjusting screw 44 and the screw hole 40c of the wedge-shaped block 40. Converted. Accordingly, the cavity block 28a moves forward and backward by sliding between the inclined surface 40b of the wedge-shaped block 40 and the inclined surface 42 of the cavity block 28a. Accordingly, one wedge-shaped block 40 is moved forward with the axis of the cavity block 28a interposed therebetween to move the cavity block 28a in the axial direction, and the other wedge-shaped block 40 is moved backward to move backward from the axis of the cavity block 28a.

  In this way, the opening edge side of the cavity block 28a moves in the radial direction by the gap g formed on the outer peripheral surface of the cavity block 28a, and the axis of the roller body molding cavity 29 is the axis of the shaft molding cavity 24a. Can match with the heart. In addition, since the cavity block 28a is constrained by a plurality of wedge-shaped blocks 40, after the axis of the roller body forming cavity portion 29 is aligned with the axis of the shaft forming cavity portion 24a, the cavity block 28a is moved in the radial direction. Never move. Accordingly, by moving the movable mold 12 forward to the fixed mold 11, the guide pins 13 and the guide holes 14 can be fitted to clamp the fixed mold 11 and the movable mold 12.

4 and 5 show a third embodiment, FIG. 4 is a perspective view of a split mold, and FIG. 5 is an enlarged front view of a portion A in FIG. The split mold mold is composed of a fixed mold 51 and a movable mold 52 that is movable relative to the fixed mold 51. A cavity block 53a having a roller body molding cavity 53 for molding the roller body 3a of the magnet roller 3 and shafts for molding the shafts 3b and 3c at both ends are formed on the dividing surface of the fixed mold 51 and the movable mold 52. cavity block 54a having a mold cavity portion 54 is provided.

The movable mold 52 has an eccentric cam 56 as an axis misalignment adjusting mechanism that moves and adjusts the shaft forming cavity portion 54 in a direction perpendicular to the axis so that the cavity block 54a of the shaft forming cavity portion 54 is sandwiched from the left and right. Is provided. The eccentric cam 56 adjusts the shift of the shaft center of the shaft forming cavity portion 54 with respect to the shaft center of the roller main body forming cavity portion 53, and is displaced from the shaft forming cavity portion 54 on the fixed mold 51 side. Can be adjusted in case.

  The eccentric cam 56 has the same structure as the eccentric cam 35 of the first embodiment, and the tool engaging portion 56a of the eccentric cam 56 is provided to face the dividing surface of the movable mold 52, so that the operation direction is The direction is the same, and operability can be improved.

  In the above-described embodiment, the case where the movable mold is provided with the axis misalignment adjusting mechanism has been described. However, the fixed mold may be provided with the axis misalignment adjusting mechanism. Moreover, although the material which comprises a mechanism is not limited, the thing of high hardness by hardening and surface treatment is desirable.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of a magnet roller molding die according to a first embodiment of the present invention. The front view of the movable metal mold | die which shows the embodiment. The 2nd Embodiment of this invention is shown, The vertical side view of a movable metal mold | die. The perspective view of the molding die of a split mold type | mold which shows 3rd Embodiment of this invention. The front view which showed the same embodiment and expanded the A section of FIG. A prior art example is shown, (a) is a perspective view of a split mold molding die, and (b) is a perspective view of a vertical punching mold.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Magnet roller, 3a ... Main body part, 3b, 3c ... Shaft part, 11 ... Fixed mold, 12 ... Movable mold, 24a, 30 ... Shaft molding cavity part, 28a, 28b ... Cavity block, 29 ... Roller main body molding Cavity, 35 ... Eccentric cam (shaft center adjustment mechanism)

Claims (5)

A fixed mold,
A movable mold that is movable back and forth with respect to the fixed mold;
The fixed mold and the movable mold are coaxially opposed to each other and have shaft forming cavities for forming the shafts at both ends of the magnet roller, and at least the movable mold has a roller body molding cavity for the magnet roller. A cavity block having a portion;
It is provided in at least one of the fixed mold or the movable mold, and the cavity block is moved and adjusted in a direction perpendicular to the axis of the roller body molding cavity with respect to the mold, so that the roller body molding cavity An axis misalignment adjusting mechanism for adjusting an axis misalignment;
A mold for forming a magnet roller, comprising: A fixed mold,
A movable mold that is movable back and forth with respect to the fixed mold;
Cavity block having a roller body molding cavity portion for molding a roller body portion of a magnet roller provided on a split surface between the fixed mold and the movable mold and a shaft molding cavity portion for molding shaft portions at both ends. Block,
A cavity block provided on at least one of the fixed mold and the movable mold and having the shaft molding cavity portion is moved and adjusted in a direction perpendicular to the axis of the cavity block . An axial misalignment adjusting mechanism for adjusting the misalignment;
A mold for forming a magnet roller, comprising: The shaft misalignment adjusting mechanism is an eccentric cam that is disposed around the cavity block and has a cam surface that presses the outer peripheral surface of the cavity block in the axial direction, and an operation unit that rotates the eccentric cam. The mold for molding a magnet roller according to claim 1 or 2. The shaft misalignment adjusting mechanism is an operation unit that is disposed around the cavity block and has a wedge-shaped block that presses the outer peripheral surface of the cavity block in the axial direction, and an adjustment screw that advances and retracts the wedge-shaped block. The mold for molding a magnet roller according to claim 1, wherein The magnet roller molding die according to claim 4, wherein the operation unit is provided on a front surface of the movable die and is operable from a front side of the movable die.

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