JP2005069444A - Molding method for roller connection body and mold and molding device used in molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding method for a roller connection body for preventing unreasonable force from being applied to a spacer having undercut when releasing from a mold. <P>SOLUTION: This molding method for the roller connection body comprises a process for preparing a fixed mold 21 having a fixed mold side protruding part 21a whose shape is matched with either 12a of a pair of curved face recessed parts in which adjacent spacers 12 face mutually and a movable mold 22 having a movable mold side protruding part 22a whose shape is matched with the other 12a of the curved face recessed parts, a process for tightening the fixed mold 21 and the movable mold 22 to form a cavity corresponding to shapes of the spacer 12 and a flexible band 13, a process for injecting resin into the cavity, and a process for opening the mold to retract the movable mold 22 obliquely for a matching face 24 of the fixed mold 21 and the movable mold 22 so as to avoid the spacer 12 in which the movable mold side protruding part 22a of the movable mold 22 is formed by resin. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for forming a roller assembly that holds a roller incorporated in a motion guide device such as a linear guide or a ball spline in a series of freely rotatable manner, and a mold and a forming apparatus used in this forming method.

  A general motion guide device such as a linear guide or a ball spline has a track rail and a moving block assembled so as to be movable relative to the track rail, and a guide target such as a table moves linearly or curvedly. Guide you to do.

  A plurality of rolling elements that roll and intervene between the track rail and the moving block so that the guide object can move smoothly. A roller-type motion guide device uses a plurality of roller groups as rolling elements. As the moving block moves relative to the track rail, these rollers roll between the track rail and the moving block and circulate in the circulation path. That is, when it reaches the end of the moving block, it is scooped up into the moving block, and is again sent from the moving block between the track rail and the moving block through the roller return path of the moving block.

  The roller coupling body holds a plurality of rollers so that they rotate smoothly without contacting each other. The central axis is interposed between a plurality of parallel rollers, and curved concave portions corresponding to the circumferential surface of the rollers are provided at both ends. A plurality of spacers formed in the above are connected by a flexible band.

  In general, such a roller assembly is manufactured by injection molding a resin such as an elastomer. Conventionally, as a method for forming a roller linked body, a roller is inserted in a mold in advance, and then the roller linked body is injection molded. This is because an undercut is formed in the spacer of the roller coupling body. Since the curved concave portions corresponding to the circumferential surface of the roller are formed at both ends in the left and right direction of the spacer, an undercut that becomes a depression is formed at the center in the vertical direction of the spacer.

  However, when a roller coupling body is formed by inserting a roller in advance as in the prior art, a sufficient gap is not formed between the roller and the spacer, and the roller may not rotate smoothly. In order to solve this problem, a technique has been devised in which a die having a roller row protruding as a core in a concave portion of the die is used to forcibly pull the roller coupling body out of the roller row after injection molding. In Patent Document 1, an interposition part (spacer) interposed between a large number of rolling elements (rollers) arranged in a line at a predetermined interval is a flexible connection part (belt). In a method of injection molding of a flexible band that is connected, a rolling element (roller) fixed to the tip of a protruding pin is fitted as a core in a recess provided in a movable side mold plate and a fixed side mold plate. In this state, injection molding is performed, and when the mold is opened, the longitudinal end portion of the molded product protruding from the movable side mold plate together with each of the molding rolling elements is gripped and pulled in a direction in which the connecting portion is curved, and the protruding pin is moved to the side. There has been proposed a flexible band forming method for obtaining the flexible band by sequentially pulling out the interposition part from between the adjacent forming rolling elements while being elastically deformed in the direction.

  According to this method, the end portion in the longitudinal direction of the connecting portion (belt) protruding when the mold is opened is gripped, and the interposed portion (spacer) is removed from the rolling element (roller) for molding while elastically deforming the protruding pin. Since it is made to pull out sequentially, the flexible band can be easily released from the mold with a small force.

Japanese Patent No. 3281952

  However, even if the molding method described in Patent Document 1 is used, the spacer has an undercut, so that the interposed portion (spacer) is forcibly released from the molding rolling element (roller). For this reason, there exists a possibility that an interposed part and a connection part (belt) may be caught on the rolling element for shaping | molding, and may be damaged at the time of mold release. Even if the intervening part is not damaged, when the intervening part is pulled out from the rolling element for molding, the upper and lower edges of the intervening part having a width larger than the gap between the rolling elements for molding are deformed. There is also a fear.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a method for forming a roller assembly in which an excessive force is not applied to a spacer having an undercut at the time of mold release, and a mold and a molding apparatus used in this forming method.

  The present invention will be described below. In addition, in order to make an understanding of this invention easy, the reference number of an accompanying drawing is attached in parenthesis, However, This invention is not limited to the form of illustration by it.

  In order to solve the above-mentioned problems, the present inventor has provided a protrusion having a shape matched to the curved concave portion of the spacer on both the fixed mold and the movable mold, and after injection molding, the spacer having the resin mold formed on the movable mold. In order to avoid this, the movable mold was retracted obliquely with respect to the mating surface of the fixed mold and the movable mold.

  Specifically, in the method for forming a roller assembly according to the present invention, the curved recesses (12a) corresponding to the circumferential surface of the roller (3) are disposed at both ends. A plurality of spacers (12) formed on a roller connecting body (11) formed by connecting a plurality of spacers (12) with a flexible band (13), wherein a pair of curved surfaces of adjacent spacers (12) face each other. A fixed mold (21) having a fixed mold-side protrusion (21a) matched to one of the recesses (12a), and a movable mold-side protrusion (22a) matched to the other curved face (12a) ) Having a movable mold (22), and the fixed mold (21) and the movable mold (22) so that cavities corresponding to the shapes of the spacer (12) and the flexible band (13) can be formed. ) A step of injecting resin into the cavity, and the movable mold (22) and the movable mold side protrusion (22a) so as to avoid the resin-molded spacer (12) and the fixed mold (21) and the movable mold (22). A mold opening step of retracting the movable mold (22) obliquely with respect to the mating surface (24) of the mold (22).

  According to this invention, an excessive force is not applied to the spacer having an undercut at the time of mold release.

  In the mold clamping step of the fixed mold (21) and the movable mold (22), a protrusion mating surface (32) which is a mating surface between the fixed mold side protrusion (21a) and the movable mold side protrusion (22a). ) Includes the axis of the roller (3) hypothesized between the spacers (12), and in the mold opening step, the movable mold (22) is preferably retracted along the projecting surface (32). .

  According to the present invention, the movable mold can be moved backward from the fixed mold so that the movable mold-side protrusion of the movable mold avoids the resin-molded spacer.

  The method of forming the roller coupling body (11) further includes the step of projecting the resin-molded roller coupling body (11) remaining on the stationary mold (21) by a projecting pin (25) that can project from the stationary mold (21). It is desirable to provide a discharge step of discharging from the fixed mold (21).

  As described above, since an excessive force is not applied to the spacer at the time of mold release, the molded roller assembly is less likely to adhere to the movable mold, and is likely to remain on the fixed mold. By providing the discharging step as in the present invention, the roller coupling body attached to the movable mold is not collected manually, and the roller coupling body can be automatically collected.

  The present invention includes a plurality of spacers (12) interposed between a plurality of rollers (3) whose central axes are parallel to each other, and curved concave portions (12a) corresponding to the peripheral surfaces of the rollers (3) are formed at both ends. A die for forming a roller assembly, which is connected by a flexible band (13), and has a shape matched to one (12a) of a pair of curved concave portions facing each other of the adjacent spacer (12). A fixed mold (21) having a fixed mold side protrusion (21a) and a movable mold side protrusion (22a) having a shape matched to the other curved surface recess (12a). When the movable mold (22) is clamped, a cavity corresponding to the shape of the spacer (12) and the flexible band (13) is formed. Can be configured.

  Further, according to the present invention, a plurality of spacers (12) are interposed between a plurality of rollers (3) whose central axes are parallel to each other, and curved concave portions (12a) corresponding to the peripheral surfaces of the rollers (3) are formed at both ends. Is a roller connecting body (11) forming device connected by a flexible band (13), and is formed in one of a pair of curved concave portions facing each other (12a) of the adjacent spacer (12). A movable mold (22) having a fixed mold (21) having a fixed mold-side protrusion (21a) and a movable mold-side protrusion (22a) having a shape matched to the other curved surface recess (12a); And molds (21, 22) in which cavities corresponding to the shapes of the spacer (12) and the flexible band (13) are formed by clamping the fixed mold (21) and the movable mold (22). And opening the movable mold (22) Sometimes, the movable mold side protrusion (22a) of the movable mold (22) has a mating surface (24) between the fixed mold (21) and the movable mold (22) so as to avoid the resin-molded spacer (12). ) And a mold opening mechanism (30) for retracting the movable mold (22) at an angle to the molding apparatus.

  In the molding apparatus, the fixed mold (21) is attached, and the fixed mold side inclined surface (23a) inclined obliquely with respect to the mating surface (24) of the fixed mold (21) and the movable mold (22). And a movable mold support section having a movable mold side inclined surface (26a) which is attached to the movable mold (22) and has an inclination angle with the fixed mold side inclined surface (23a). (26), and the mold opening mechanism (30) fixes the movable mold (22) while urging the movable mold side inclined surface (26a) against the fixed mold side inclined surface (23a). The mold (21) may be retracted.

  According to the present invention, the movable mold can be retracted obliquely with respect to the mating surface of the fixed mold and the movable mold.

  As described above, according to the present invention, both the fixed mold and the movable mold are provided with protrusions having shapes matched to the curved concave portions of the spacers, and after injection molding, the spacers in which the movable protrusions are resin-molded are provided. Since the movable mold is retracted obliquely with respect to the mating surface of the fixed mold and the movable mold so as to avoid, an excessive force is not applied to the spacer having the undercut at the time of mold release.

  1 to 3 show a roller type linear guide as a motion guide device in which a roller coupling body is incorporated. 1 shows a perspective view of the linear guide, FIG. 2 shows a cross-sectional view in a direction orthogonal to the longitudinal direction of the track rail, and FIG. 3 shows a cross-sectional view along the path of the roller circulation path.

  The configuration of the linear guide will be described. The linear guide includes a track rail 1 as a track shaft extending linearly and a moving block 2 as a moving member that is movably assembled to the track rail 1. A large number of rollers 3 are interposed between the track rail 1 and the moving block 2 so as to allow rolling motion.

  Roller rolling surfaces are formed on the left and right side surfaces of the elongated track rail 1 along the longitudinal direction. In this embodiment, a groove 1a having a substantially V-shaped cross section is formed on the left and right side surfaces of the track rail 1, and two roller rolling surfaces 1b and 1b are formed above and below the groove 1a. A total of four roller rolling surfaces 1b are provided.

  The moving block 2 is formed in a bowl shape, and includes a horizontal portion 2a facing the upper surface of the track rail 1, and sleeve portions 2b and 2b extending downward from the left and right sides of the horizontal portion 2a and facing the left and right side surfaces of the track rail 1. Prepare. Two roller circulation paths including load roller rolling surfaces 4 and 4 facing the roller rolling surfaces 1b and 1b of the track rail 1 are formed in the left and right sleeve portions 2b and 2b.

  The roller circulation path will be described. As shown in FIG. 2, upper and lower two load roller rolling surfaces 4, 4 facing the roller rolling surfaces 1 b, 1 b of the track rail 1 are formed on the sleeve portions 2 b, 2 b of the moving block 2. A load region of the roller circulation path is formed between the loaded roller rolling surfaces 4 and 4 and the roller rolling surfaces 1b and 1b. The sleeve portions 2b, 2b are provided with two upper and lower roller escape passages 5, 5 in parallel with the load roller rolling surfaces 4, 4 at a predetermined interval. The roller escape passages 5 and 5 constitute a no-load region of the roller circulation path. Further, the sleeve portions 2b and 2b are provided with U-shaped direction change paths 6 and 6 that connect both ends of the linear load roller rolling surfaces 4 and 4 and the linear roller escape passages 5 and 5 (FIG. 3). The direction change paths 6 and 6 are provided on end plates 7 provided at both ends of the moving block 2 in the traveling direction. The two direction change paths 6 and 6 include the upper load roller rolling surface 4 and the lower roller escape passage 5 and the lower load roller rolling surface 4 and the upper roller escape passage 5 shown in FIG. Are connected so as to cross three-dimensionally. These direction change paths 6 and 6 also constitute a no-load region of the roller circulation path.

  An annular roller circulation path is constituted by the loaded roller rolling surfaces 4 and 4, the pair of direction changing paths 6 and 6, and the roller escape paths 5 and 5. When the moving block 2 moves relative to the track rail 1, the plurality of roller groups 3... Circulate along the roller circulation path. The roller group 3... Rolls along a load rolling path between the roller rolling surface 1 b of the track rail 1 and the loaded roller rolling surface 4 of the moving block 2, and then in the direction changing path 6 formed on the end plate 7. Then, after passing sequentially through the roller escape passage 5 and the direction change path 6 formed in the end plate 7 on the opposite side, it is returned to the load rolling path again.

  In the present embodiment, two roller rows are provided on the left and right side surfaces of the track rail 1, but the number and arrangement positions of the roller rows can be appropriately changed according to the magnitude of the load, the load direction, and the like. Further, the configuration itself of the track rail 1 and the moving block 2 is not limited to the example of this embodiment.

  The roller groups 3... Are held in series by a roller coupling body 11 so as to be rotatable and slidable. FIG. 4 is a perspective view of the roller coupling body 11. 5A is a plan view of the roller coupling body 11, FIG. 5B is a cross-sectional view taken along line AA of FIG. 5A, and FIG. 5C is B of FIG. 5B. -B line sectional drawing is shown, FIG.5 (d) shows the CC sectional view taken on the line of FIG.5 (b).

  The roller coupling body 11 is formed by integrally molding a plurality of spacers 12... And flexible bands 13, 13 and has an end band shape as a whole. Specifically, the roller coupling body 11 is interposed between a plurality of rollers 3 whose central axes are parallel to each other, and has a plurality of spacers 12 each having curved concave portions 12a corresponding to the peripheral surfaces of the rollers 3. Connected with a flexible band 13.

  Curved recesses 12a and 12a are formed at both ends of the spacer 12 in the traveling direction so as to conform to the outer peripheral surface of the adjacent rollers 3 and 3 and to slidably contact the outer peripheral surface of the rollers 3 and 3. The radius of curvature of the curved recess 12a may be set slightly larger than the radius of the roller. By forming the curved concave portion 12a, an undercut 12b that becomes a depression is formed at the center in the vertical direction of the spacer 12 (see FIG. 5B).

  The pair of flexible bands 13, 13 are connected to the center portions in the vertical direction of both side surfaces 12 c, 12 c of the spacers 12 in the axial direction of the roller 3, and protrude outward from the end surface of the roller 3. The thicknesses of the flexible bands 13 and 13 are formed thin so that they can be flexed corresponding to the roller circulation path.

  As shown in FIG. 2, a guide groove 9 is formed in the roller circulation path to guide the movement of the flexible band 13 of the roller coupling body 11 over the entire circumference. Of course, a guide groove 9 for guiding the movement of the flexible band 13 is also formed in the ball circulation path of the load rolling path, so that the roller coupling body 11 moves when the moving block 2 is removed from the track rail 1. It is prevented from falling out of the block 2. Here, since the roller groups 3 are held by the roller coupling body 11, the roller groups 3 do not fall off the moving block 2.

  6 to 8 show a molding apparatus according to an embodiment of the present invention for injection molding the roller coupling body 11. 6 shows the mold clamping state, FIG. 7 shows the mold opening state, FIG. 8 shows the mold opening completion, and the roller coupling body discharging state. The mold of the molding apparatus includes a fixed mold 21 and a movable mold 22 that can move forward and backward with respect to the fixed mold 21.

  Both ends of the fixed mold 21 are attached to fixed mold support portions 23 and 23. A pair of inclined surfaces 23 a and 23 b that are inclined at a predetermined angle with respect to the mating surface 24 of the fixed mold 21 and the movable mold 22 are formed on the pair of fixed mold support portions 23 and 23. The inclined surfaces 23a and 23b are inclined at an equal angle with respect to the mating surface 24 so as to be gradually separated from each other toward the upper side. As will be described in detail later, the movable mold 22 retreats from the fixed mold 21 along one of the inclined surfaces 23a when the mold is opened.

  A fixed mold side protrusion 21a for forming a spacer cavity of the roller coupling body 11 is formed on the upper surface of the fixed mold 21, and a flexible band cavity is formed around the fixed mold side protrusion 21a. A groove portion 21b is formed. The fixed mold 21 is provided with a plurality of projecting pins 25 for discharging the resin-molded roller coupling body 11 from the fixed mold 21 in accordance with the number of spacers 12. As shown in FIG. 6, when the mold is clamped, the tips of the protruding pins 25 ... form a cavity for the spacer. As shown in FIG. 8, after injection molding, the protruding pins 25... Protrude from the fixed mold 21 and discharge the roller coupling body 11 remaining on the fixed mold.

  Both ends of the movable mold 22 are also attached to the movable support sections 26 and 26. A pair of movable mold side inclined surfaces 26a, 26b having the same inclination angle as that of the fixed mold side inclined surfaces 23a, 23b are also formed on the pair of movable support portions 26, 26. The movable mold 22 and the movable mold supports 26 and 26 are attached to vertical movement sections 27 and 27 that are movable in the vertical direction with respect to the fixed mold 21 so as to be slidable in the horizontal direction. A spring 28 is provided between one of the vertical moving parts 27, 27 and the movable support 26, and the spring 28 urges the movable mold 22 and the movable support 26, 26 to the other of the vertical moving parts 27. (See FIG. 7). These vertical moving parts 27 and 27 and the spring 28 constitute a mold opening mechanism 30. When the mold is opened, the movable mold 22 is retracted from the fixed mold 21 obliquely with respect to the mating surface 24 by the mold opening mechanism 30.

  On the lower surface of the movable mold 22, a movable mold-side protrusion 22 a for forming a spacer cavity of the roller coupling body 11 is formed. The movable mold 22 is formed with a gate 22b for supplying molten resin from the nozzle of the injection molding apparatus to the cavity.

  When the vertical moving portions 27 and 27 are lowered during mold clamping, the movable mold side inclined surfaces 26a and 26b come into contact with the fixed mold side inclined surfaces 23a and 23b as shown in FIG. The movable mold 22 is positioned with respect to. When the vertical moving portions 27 and 27 are raised when the mold is opened, the movable mold 22 is retracted in the vertical direction from the fixed mold 21 while the spring 28 urges the movable mold-side inclined face 26a to the fixed mold-side inclined face 23a. For this reason, the movable mold | type 22 retreats diagonally with respect to the mating surface 24 along the fixed mold | type side inclined surface 23a which is neither perpendicular nor horizontal. When the movable mold 22 is further retracted from the fixed mold 21, the movable mold 22 is urged by the other of the vertical moving portions 27 and retracts in the vertical direction.

  9 to 12 show detailed views of the fixed mold 21 and the movable mold 22. 9 shows the mold clamping state, FIGS. 10 and 11 show the mold opening state, and FIG. 12 shows the mold opening completion and the roller connected body discharging state. The fixed mold 21 is formed with a fixed mold-side protrusion 21a having a shape matched to one of a pair of curved concave sections 12a facing each other of the adjacent spacer 12, and the movable mold 22 is formed on the other of the curved concave sections 12a. A movable side protrusion 22a is formed. When the mold is clamped, the fixed mold side protrusion 21a and the movable mold side protrusion 22a constitute the core of the roller 3 virtually between the spacers. The rotation axes of the plurality of rollers 3 imaginary between the plurality of spacers 12 are arranged parallel to each other and arranged in a horizontal plane. A protrusion mating surface 32 which is a mating surface between the fixed mold side protrusion 21 a and the movable mold side protrusion 22 a is an inclined surface including an axis of a roller virtually between the spacers 12 and 12. The protrusion mating surface 32 is parallel to the fixed mold side inclined surface 23 a and is inclined at a predetermined angle with respect to the mating surface 24 (horizontal plane) of the fixed mold 21 and the movable mold 22. When the mold is opened, the movable mold 22 moves along the projecting surface 32.

  Next, a molding method for molding the roller coupling body using the molding apparatus and the mold having the above-described configuration will be described. First, the mold clamping state shown in FIG. 9 is set, and the spacers 12 and the cavity for the flexible band 13 are formed between the fixed mold 21 and the movable mold 22. Next, the molten resin is injected into the cavity and injection molding is performed by holding and cooling.

  Next, the mold is opened as shown in FIG. At this time, the movable mold 22 is retreated obliquely along the fixed mold side inclined surface 23a (projection mating surface 32) so that the movable mold side protrusion 22a of the movable mold 22 avoids the resin-molded spacer 12. At this time, an excessive force is not applied to the spacer 12 from the movable mold-side protrusion 22 a, and the roller coupling body 11 remains on the fixed mold 21. As shown in FIG. 11, when the movable mold 22 that avoids the spacer 12 is further retracted, the movable mold 22 is retracted in the vertical direction.

  Finally, as shown in FIG. 12, the resin-molded roller coupling body 11 remaining on the fixed mold 21 is discharged from the fixed mold 21 by the protruding pins 25 that can protrude from the fixed mold 21.

  The rollers 3 are interposed between the spacers 12 while curving the flexible band 13 in the roller coupling body 11 thus obtained. Since a gap is formed between the rollers 3 and the spacers 12, the rollers 3 circulate smoothly with respect to the roller coupling body 11.

  In addition, this invention is not restricted to the said embodiment, A various change is possible in the range which does not change the summary of this invention. For example, the specific structures of the fixed type and the movable type may be other than those described above, a recess for forming a cavity for the flexible band may be formed on the movable type side, and the gate on the fixed type side. It may be formed. Further, the roller coupling body may be released manually without providing the protruding pin on the fixed mold. Further, the mold opening mechanism is not limited to the above embodiment as long as the movable mold can be moved obliquely.

  Even in the shape and structure of the roller coupling body, a groove for accommodating the lubricant may be formed in the curved concave portion of the spacer, and various changes can be made. Moreover, although the said embodiment demonstrated the example which integrated the roller coupling body in the linear guide as a motion guide apparatus, you may integrate in a spline, a roller screw, etc.

The perspective view of a linear guide. Sectional drawing of the linear guide of the direction orthogonal to the longitudinal direction of a track rail. Sectional drawing of the linear guide along the path | route of a roller circulation path. The perspective view of a roller coupling body. 5A is a plan view of the roller assembly, FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5A, and FIG. 5C is a cross-sectional view taken along the line BB in FIG. 5B. FIG.5 (d) is CC sectional view taken on the line of FIG.5 (b). Sectional drawing (mold clamping state) which shows the shaping | molding apparatus of one Embodiment of this invention Sectional drawing (mold open state) which shows the shaping | molding apparatus of one Embodiment of this invention. Sectional drawing which shows the shaping | molding apparatus of one Embodiment of this invention (The mold opening completion | finish, a roller coupling body discharge state). Detailed view of fixed type and movable type (clamped state). Detailed view of fixed type and movable type (opened state). Detailed view of fixed type and movable type (opened state). Detailed view of fixed type and movable type (end of mold opening, roller assembly discharged state).

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Roller 11 ... Roller coupling body 12 ... Spacer 12a ... Curved concave part 13 ... Flexible band 21 ... Fixed mold 21a ... Fixed mold side protrusion 22 ... Movable mold 22a ... Movable mold side protrusion 23 ... Fixed mold support part 23a ... Fixed mold side inclined surface 26 ... Movable mold support part 26a ... Movable mold side inclined surface 30 ... Mold opening mechanism 32 ... Projection mating surface

Claims (6)

A method for forming a roller assembly in which a plurality of spacers having central axes interposed between a plurality of parallel rollers and curved recesses formed at both ends corresponding to the circumferential surfaces of the rollers are connected by flexible bands. There,
A movable mold having a fixed mold having a fixed mold-side protrusion matched to one of a pair of curved curved depressions facing each other, and a movable mold-shaped protrusion matching the other of the curved depressions. Preparing the mold,
Clamping the fixed mold and the movable mold so that a cavity corresponding to the shape of the spacer and the flexible band can be formed;
Injecting resin into the cavity;
A mold opening step of retracting the movable mold obliquely with respect to the mating surface of the fixed mold and the movable mold so that the movable mold-side protrusion of the movable mold avoids the resin-molded spacer. A method for forming a roller assembly, wherein: In the mold clamping step of the fixed mold and the movable mold, the projecting surface that is the mating surface of the stationary mold side projecting portion and the movable mold side projecting portion includes a roller axis that is virtually between the spacers,
2. The method for forming a roller linked body according to claim 1, wherein, in the mold opening step, the movable mold is retracted along the projecting surface. The method for forming the roller assembly further includes:
The roller coupling according to claim 1, further comprising: a discharging step of discharging the resin-molded roller coupling body remaining on the stationary mold from the stationary mold by a projecting pin that can project from the stationary mold. Body molding method. A gold for forming a roller assembly, in which a plurality of spacers, which are interposed between a plurality of rollers whose central axes are parallel to each other and have curved concave portions corresponding to the peripheral surfaces of the rollers at both ends, are connected by flexible bands. Type,
A fixed mold having a fixed mold-side protrusion that matches the shape of one of a pair of curved concave portions facing each other of the adjacent spacer; and a movable mold-side protrusion that matches the shape of the other curved recess. A mold for forming a roller assembly, wherein a cavity corresponding to the shape of the spacer and the flexible band is formed when the fixed mold and the movable mold are clamped. An apparatus for forming a roller assembly in which a plurality of spacers having central axes interposed between a plurality of parallel rollers and curved recesses corresponding to the peripheral surface of the roller are formed at both ends by flexible bands. There,
A fixed mold having a fixed mold-side protrusion that matches the shape of one of a pair of curved concave portions facing each other of the adjacent spacer; and a movable mold-side protrusion that matches the shape of the other curved recess. A mold in which a cavity corresponding to the shape of the spacer and the flexible band is formed by clamping the fixed mold and the movable mold;
When the movable mold is opened, the movable mold is retracted obliquely with respect to the mating surface of the fixed mold and the movable mold so that the movable mold side protrusion of the movable mold avoids the resin-molded spacer. And a mold opening mechanism. The molding device includes:
A fixed mold support portion having a fixed mold side inclined surface to which the fixed mold is attached and inclined with respect to a mating surface of the fixed mold and the movable mold;
The movable mold is attached, and a movable mold support section having a movable mold side inclined surface with a tilt angle matched to the fixed mold side inclined surface,
The molding apparatus according to claim 5, wherein the mold opening mechanism retracts the movable mold from the fixed mold while urging the movable mold side inclined surface to the fixed mold side inclined surface.

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