JP4171460B2 - Belt with protrusion - Google Patents

Description

  The present invention relates to a belt with protrusions provided with protrusions by outsert molding.

The toothed belt 2 is formed by an inner peripheral side tooth portion 12 provided with a plurality of teeth 11 at predetermined intervals in the belt longitudinal direction, and an outer peripheral side back portion 14 in which a core wire 13 is embedded. Such a toothed belt 2 is driven to run by being suspended on a toothed pulley. When this belt 2 is used for transporting a card or paper, the card or paper is locked. Protruding bodies 4 for feeding are formed on the belt 2 by molding with resin. Thus, when the protrusion 4 is formed on the belt 2, if the protrusion 4 is formed so that the teeth 11 inside the belt 2 are embedded, the teeth 11 of the belt 2 cannot be engaged with the pulley. The protrusion 4 is preferably formed on the back surface of the belt 2 .

  FIG. 33 shows an example in which the protrusion 4 is formed by resin molding on the back surface of the belt 2, and the belt 2 is formed by molding the tooth portion 12 and the back portion 14 with an elastomer such as polyurethane. A support protrusion 1 is provided on the back portion 14 of the belt 2 so as to protrude integrally. The belt 2 produced by projecting the support protrusion 1 on the back is set in a molding die for injection molding and injection molding is performed. The belt 2 is set so that the support protrusion 1 is disposed in the cavity provided in the molding die, and the protrusion 4 is formed by injecting thermoplastic resin into the cavity through the gate. be able to. The projection 4 is outsert-molded with the bifurcated joint 5 formed at the base thereof sandwiching both sides of the support projection 1 in the belt longitudinal direction.

  The protrusion 4 can be provided upright on the back surface of the belt 2 by performing outsert molding on the outside of the support protrusion 1 protruding from the back of the belt 2 as described above. Since the inner teeth 11 of the belt 2 are not embedded in the body 4, the teeth 11 of the belt 2 cannot be engaged with the pulley.

  However, the protrusion 4 that is outsert-molded on the support protrusion 1 is only held on the back surface of the belt 2 by sandwiching the support protrusion 1 at the joint 5 of the base. Accordingly, the attachment strength of the protrusion 4 to the belt 2 depends on the adhesion of the protrusion 4 to the support protrusion 1. For example, the belt 2 is made of polyurethane and the protrusion 4 is made of polyacetal. Both resins have low adhesion, and the attachment strength of the protrusions 4 may be extremely low.

  Further, when the projection 4 is outsert-molded, there is a possibility that the support protrusion 1 of the belt 2 may be deformed due to the injection pressure when the resin is injected into the cavity of the molding die. When the protrusion 4 is outsert-molded in a state where the protrusion 1 is deformed, the protrusion 4 is deformed, for example, the rising angle of the protrusion 4 is inclined.

  The present invention has been made in view of the above points, and has an object of providing a protrusion with a high mounting strength on a support protrusion of a belt, and without causing deformation such as inclination. The object is to provide a protrusion.

The belt with protrusions according to the first aspect of the present invention has a support protrusion 1 integrally protruding on the back surface of the belt 2 and has a bifurcated joint 5 on both sides of the support protrusion 1 in the belt longitudinal direction. In a sandwiched state, the protrusion 4 formed by resin outsert molding is integrally provided by raising the back surface of the belt 2 so as to penetrate the support protrusion 1 in the belt longitudinal direction. A bifurcated joint 5 is outsert-molded so as to sandwich the both sides of the support protrusion 1 in the belt longitudinal direction, and the bifurcated joint 5 is made of resin filled in the through-hole 6. Are connected and integrated.

  According to a second aspect of the present invention, in the first aspect, the joint 5 of the protrusion 4 has a narrower width dimension than the support protrusion 1 of the belt 2.

  According to a third aspect of the present invention, in the first or second aspect, the protrusion 4 is formed in a shape in which a body portion 25 having an inverted V-shaped cross section is provided on the bifurcated joint portion 5 of the base portion. It is characterized by.

  According to a fourth aspect of the present invention, in the first aspect, the protrusion 4 is formed in a shape in which a bifurcated joint portion 5 is provided at the base portion and a locking claw 26 protruding in the horizontal direction is provided at the upper end portion. It is characterized by.

  As described above, the belt with protrusions according to the present invention has a through hole penetrating the support protrusion in the longitudinal direction of the belt, and a joint portion and a through hole formed so as to sandwich both sides of the support protrusion in the longitudinal direction of the belt. Since the resin filled in is connected and integrated, the bifurcated joint of the base of the protrusion can be integrated with the support protrusion by the resin formed in the through hole of the support protrusion. The body does not come off from the support protrusion, and the attachment strength of the protrusion formed outsert-molded on the support protrusion can be increased.

  In addition, by forming the joint of the protrusions to be narrower than the support protrusions of the belt, the protrusions can be supported at an accurate standing angle without causing the support protrusions to fall or deform. The protrusion can be outsert-molded.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 shows an example of an embodiment of the present invention. A belt 2 includes an inner peripheral tooth portion 12 provided with a plurality of teeth 11 at predetermined intervals in the belt longitudinal direction (traveling direction of the belt 2). Further, the back portion 14 on the outer peripheral side in which the core wire 13 is embedded is formed, and the tooth portion 12 and the back portion 14 are formed of an elastomer such as polyurethane. Further, support protrusions 1 are integrally provided on the back portion 14 of the belt 2 at four locations along the belt longitudinal direction. The support protrusion 1 includes a hook support protrusion 1a in which one side of the both sides in the belt longitudinal direction is an inclined surface perpendicular to the back surface of the belt 2 and the other side is inclined, and both surfaces in the belt longitudinal direction. Is composed of two types of tower support protrusions 1b perpendicular to the back surface of the belt 2, and the hook support protrusions 1a and the tower support protrusions 1b are paired. The hook support protrusions 1a and the tower support protrusions 1b are respectively provided with through holes 6 penetrating so as to open on both sides in the belt longitudinal direction.

  The protrusion 2 is outsert-molded by setting the belt 2 formed as described above to the molding die 3 and performing injection molding. The plurality of mold parts 16 constituting the molding die 3 are formed. , 17 are formed with recesses 18 for molding. In this molding die 3, after the mold parts 16 and 17 are opened and the belt 2 is set in the molding recess 18, the mold parts 16 and 17 are closed. As shown in FIG. In this part, a cavity 19 that can be filled with resin is formed between the back surface of the belt 2 and the molding recess 18. The cavity 19 is formed corresponding to each support protrusion 1 provided on the belt 2.

  Then, after setting the belt 2 on the molding die 3 as shown in FIG. 3, when a thermoplastic resin such as polyacetal is injected into the molding die 3 from the injection molding machine, the resin is removed from the sprue formed on the molding die 3. It branches to the runner 20 and flows into each cavity 19 from the gate 7 and is filled. As described above, the protrusions 4 can be outsert-molded on the support protrusions 1 by the resin filled in the cavities 19.

  FIG. 2 shows the protrusion 4 outsert-molded on the support protrusion 1 in this manner. The protrusion 4 is formed by outsert molding so that the base bifurcated joint 5 sandwiches both sides of the support protrusion 1 in the longitudinal direction of the belt, and the resin is used when the cavity 19 is filled with resin. A part of the through-hole 22 flows into the through-hole 6 of the support protrusion 1, and the through-molded part 22 formed by the resin flowing into the through-hole 6 is integrally connected to the joint pieces 23 a and 23 b of the bifurcated joint 5. Has been. As described above, since the joining pieces 23 a and 23 b of the bifurcated joint 5 at the base of the protrusion 4 are connected and integrated through the through hole 6 of the support protrusion 1, the protrusion 4 is not detached from the support protrusion 1. The attachment strength of the protrusion 4 that is outsert-molded on the support protrusion 1 can be obtained.

  Here, as the protrusions 4 formed on the belt 2, the hook-shaped protrusions 4a outsert-molded on the hook support protrusions 1a and the tower-shaped protrusions outsert-molded on the tower support protrusions 1b. 4b. The hook-shaped protrusion 4a is formed in a shape in which a bifurcated joint portion 5 is provided at the base portion of the main body portion 25, and a locking claw 26 that protrudes in the horizontal direction is provided at the upper end portion. The belt 2 is erected on the back surface of the belt 2 so as to tilt forward. The tower-shaped protrusion 4a is formed in a shape in which a main body 25 having an inverted V-shaped cross section is provided on the bifurcated joint 5 at the base, and the tower-shaped protrusion 4b is perpendicular to the back surface of the belt 2. It is set up standing up. The hook-shaped protrusions 4a and the tower-shaped protrusions 4b are used as a pair for transporting paper or the like. For example, the front end of the paper is regulated by the tower-shaped protrusions 4b and the rear end is hook-shaped protrusions. The paper is stably fed with the belt 2 so that the paper can be stably fed with the belt 2.

  Of the two types of protrusions 4 described above, as shown in FIG. 1B, the hook-shaped protrusion 4 a includes the joint portion 5, and the overall width direction dimension is the width direction of the support protrusion 1 of the belt 2. However, as shown in FIG. 1 (c), the tower-shaped protrusion 4 b is formed so that the width of the joint 5 is narrower than the width of the support protrusion 1 of the belt 2. The width of the main body 25 is further narrowed.

  In this way, when the projection 4 of the support projection 1 having a narrow width of the joint portion 5 is outsert-molded, the belt 2 is set in the molding recess 18 between the mold portions 16 and 17 as shown in FIG. As described above, both end portions of the support protrusion 1 are fitted into fitting recesses 29 formed on the inner surfaces of the mold portion 17 facing the molding recess 18. By injecting and filling the resin into the cavity 19, the protrusion 4 can be outsert-molded on the support protrusion 1. Is fixed in the molding die 3 and can prevent the support protrusion 1 from being deformed or deformed by the injection pressure when the resin is injected. The protrusion 4 can be outsert-molded on the support protrusion 1 at an accurate standing angle.

  When the belt 2 is set on the molding die 3 and the projection 4 is outsert-molded as described above, for example, in the case of the hook-shaped projection 4a, if the locking claw 26 is deformed and the horizontality varies, Since paper or the like may not be accurately conveyed by the hook-shaped protrusion 4a, it is necessary to mold the hook-shaped protrusion 4a without causing deformation of the locking claw 26. Factors that influence the level of the locking claw 26 include shrinkage deformation of the injection molding resin and deformation of the belt 2 using the pressure distribution in the cavity 19 at the time of injection molding as an external force and restoration from the deformation. Broadly divided. Then, the injection molding process is simulated and analyzed by CAE (Computer Aided Engineering), the shrinkage deformation prediction and the pressure distribution around the belt 2 are predicted so that the locking claw 26 can be molded without deformation. Is possible. Therefore, in the present invention, the position of the gate 7 when the projection 4 is injection-molded and the thickness of each of the bifurcated joining pieces 23a and 23b of the joint 5 at the base of the projection 4 are set, and the projection 4 is out. A simulation analysis of sart molding was performed. Input data for the simulation analysis is as follows. In order to analyze the flow, as the shape data, the shape of the part where the resin flows is created as an assembly of elements based on CAD, the thickness data and the resin flow field representing the shape of the mold Input data such as viscosity, shear rate, density, specific heat, thermal conductivity, etc. of the resin used as the material of the resin, and injection conditions, resin melting temperature, The pressure holding time, cooling time, switching point between pressure holding and injection were entered. For deformation analysis, the elastic modulus, Poisson's ratio, linear expansion coefficient, thermal conductivity, mold material thermal conductivity, etc. were input.

  FIG. 5A shows the thickness of the joint piece 23a on the front side in the direction in which the locking claw 26 protrudes out of the bifurcated joint pieces 23a and 23b of the joint portion 5 of the projection body 4 (hook-shaped projection body 4a). FIG. 5B shows a diagram designed by CAD so as to be thicker than the thickness of the joining piece 23b of FIG. 5, and FIG. 5B shows that the thickness of the front joining piece 23a and the thickness of the rear joining piece 23b are as equal as possible. The designed figure is shown. In addition, the unit of the numerical value described in FIG. 5 is mm.

  FIG. 6A shows a CAD design in which the position of the gate 7 is provided so as to correspond to the side end surface of the base portion of the main body 25 of the protrusion 4, and FIG. 6B shows the gate 7. The figure which designed by CAD so that this position may be provided corresponding to opening of the through-hole 6 of the support protrusion 1 is shown. The numbers shown in FIG. 6 indicate the positions and sensor numbers of virtual sensors that are arranged in the cavity 19 so as to surround the support protrusion 1 of the belt 2 and detect pressure and temperature. .

  7 and 8, the design of the joint 5 of the hook-shaped protrusion 4a is set so that the thickness of the front joint piece 23a is thicker than the rear joint piece 23b as shown in FIG. The position of the gate 7 is set on the side surface of the main body 25 of the protrusion 4 as shown in FIG. 6A, and the analysis result obtained by simulating injection molding under these conditions is displayed on the display in color print It is a thing.

  FIG. 7 shows the time course of the resin flow from the injection start to the cavity 19 through the sprue 21 and the runner 20 until 99% of the resin is filled in the mold 3. is there. The vertical multicolored band displayed on the left of the figure indicates the elapsed time from the start of injection in color, and the arrival position of the resin immediately after the start of injection is indicated in red. When about 0.2 seconds to 0.3 seconds pass, it passes through the sprue 21 as shown in yellow, and after about 0.3 seconds to 0.7 seconds passes through the runner 20 as shown in green. 7, when about 0.8 seconds elapse, it can be predicted from FIG. 7 that the projection 4 starts to flow into the cavity 19 as shown in blue. In the cavity 19, it can be predicted that the main body portion 25 of the protrusion 4 and then the portion of the locking claw 26 are filled with resin, and then the portion of the joint portion 5 is filled with resin. FIG. 7 shows a state in which 99% of the resin is filled, and brown indicates a portion not filled with the resin. This brown part is the rear joining piece 23b of the joint 5 of the hook-shaped protrusion 4a, and therefore it can be predicted that the part of the rear joining piece 23b of the hook-shaped protrusion 4a will be formed last. it can.

  FIG. 8 shows the pressure distribution when resin is injected from the gate 7 through the sprue 21 and the runner 20 into the cavity 19 and 100% of the resin is filled. The vertical multicolored band displayed on the left side of the figure shows the relationship between pressure and color. From FIG. 8, the pressure in the molding die 3 is the cavity of the sprue 21, runner 20, and tower-shaped protrusion 4b. 19 and the cavity 19 of the hook-shaped protrusion 4a are lowered in this order, and the pressure of the joint portion 5 is lower than that of the main body 25 and the locking claw 26 in the cavity 19 for forming the hook-shaped protrusion 4a. It is predicted. Furthermore, at the joint 5 of the hook-shaped protrusion 4a, the pressure of the rear joint piece 23b is lower than that of the front joint piece 23a, and is expected to be close to 0 MPa.

  FIG. 9 shows that the design of the joint 5 of the hook-shaped protrusion 4a is set so that the thickness of the front joint piece 23a is thicker than that of the rear joint piece 23b, as in FIG. 5A. At the same time, when the position of the gate 7 is set on the side surface of the main body 25 of the hook-shaped protrusion 4a as shown in FIG. 6A, injection of resin from the gate 7 to the cavity 19 is started and then the cavity 19 The time course of the flow of the resin until 94.5% of the resin is filled is shown. Brown indicates a resin-unfilled portion, and from FIG. 9, it can be predicted that the tip end portion of the rear joint piece 23b of the hook-shaped protrusion 4a is molded last.

  FIG. 10 shows the pressure distribution in the cavity 19 when the resin 19 is completely filled when the design of the joint 5 of the hook-shaped protrusion 4a and the position of the gate 7 are set in the same manner as in FIG. Is shown. In the cavity 19 for forming the hook-shaped protrusion 4a, the pressure of the rear joint piece 23b is lower than that of the front joint piece 23a, and is expected to be close to 0 MPa.

  FIG. 11 shows the relationship between the pressure measured by the sensor at the position shown in FIG. 6A and the injection molding time when pressure is measured under the same conditions as in FIG. Of the pressure around the support protrusion 1, that is, the pressure difference between the front joint piece 23a and the rear joint piece 23b, the pressure difference between the top and bottom of the front joint piece 23a, and the top and bottom of the rear joint piece 23b. Can be predicted. Further, FIG. 12 shows the relationship between the average temperature measured by the sensor at the position shown in FIG. 6A and the time of injection molding, and the distribution of the temperature around the support protrusion 1 of the belt 2, that is, The temperature difference between the front side joining piece 23a and the rear side joining piece 23b, the temperature difference between the upper and lower sides of the front side joining piece 23a, and the upper and lower sides of the rear side joining piece 23b can be predicted.

  FIG. 13 shows the design of the joint 5 of the hook-shaped protrusion 4a so that the thickness of the front joint piece 23a and the rear joint piece 23b is set to be the same as shown in FIG. When the position is set on the side surface of the main body 25 of the hook-shaped protrusion 4a as shown in FIG. 6A, the resin is injected into the cavity 19 after the injection of the resin from the gate 7 to the cavity 19 starts. It shows the time course of the flow of the resin until it is filled in%. Brown indicates a resin-unfilled portion, and it can be predicted from FIG. 13 that the hook-shaped protrusion 4a is finally formed with the tip portion of the rear joining piece 23b.

  FIG. 14 shows the pressure distribution in the cavity 19 when the resin 19 is completely filled with the design of the joint 5 of the hook-shaped protrusion 4a and the position of the gate 7 as in FIG. Is shown. In the cavity 19 for forming the hook-shaped protrusion 4a, it is expected that the pressure of the rear joint piece 23b is lower than that of the front joint piece 23a.

  FIG. 15 shows the relationship between the pressure measured by the sensor at the position shown in FIG. 6A and the injection molding time when pressure is measured under the same conditions as in FIG. Of the pressure around the support protrusion 1, that is, the pressure difference between the front joint piece 23a and the rear joint piece 23b, the pressure difference between the top and bottom of the front joint piece 23a, and the top and bottom of the rear joint piece 23b. Can be predicted. Further, FIG. 16 shows the relationship between the average temperature measured by the sensor at the position shown in FIG. 6A and the time of injection molding, that is, the temperature distribution around the support protrusion 1 of the belt 2, that is, The temperature difference between the front side joining piece 23a and the rear side joining piece 23b, the temperature difference between the upper and lower sides of the front side joining piece 23a, and the upper and lower sides of the rear side joining piece 23b can be predicted.

  From the prediction result of the simulation analysis, the design of the joint 5 of the hook-shaped protrusion 4a is set so that the thickness of the front joint piece 23a is thicker than that of the rear joint piece 23b as shown in FIG. Rather than setting the thickness of the front joining piece 23a and the rear joining piece 23b as much as possible as shown in FIG. 5 (b), the pressure distribution around the support protrusion 1 of the belt 2 can be reduced. It is confirmed that the difference can be reduced.

  FIG. 17 shows the design of the joint 5 of the hook-shaped protrusion 4a so that the front joint piece 23a is thicker than the rear joint piece 23b as shown in FIG. Is set at a position corresponding to the opening of the through-hole 6 of the support protrusion 1 as shown in FIG. 6B, the injection of resin from the gate 7 to the cavity 19 is started, and then the resin is added to the cavity 19. It shows the time course of the flow of the resin until it is filled in%. From FIG. 17, it can be predicted that the tip end portion of the locking claw 26 is formed last in the hook-shaped protrusion 4 a.

  FIG. 18 shows the pressure distribution in the cavity 19 when the resin is completely filled in the cavity 19 when the design of the joint 5 of the hook-shaped protrusion 4a and the position of the gate 7 are set in the same manner as in FIG. Is shown. In the cavity 19 for forming the hook-shaped protrusion 4a, the pressure at the tip of the locking claw 26 is the lowest, and the pressure difference between the front joint piece 23a and the rear joint piece 23b is expected to be small. The

  FIG. 19 shows the relationship between the pressure measured by the sensor at the position shown in FIG. 6B and the injection molding time when pressure is measured under the same conditions as in FIG. Of the pressure around the support protrusion 1, that is, the pressure difference between the front joint piece 23a and the rear joint piece 23b, the pressure difference between the top and bottom of the front joint piece 23a, and the top and bottom of the rear joint piece 23b. Can be predicted. FIG. 20 shows the relationship between the average temperature measured by the sensor at the position shown in FIG. 6B and the injection molding time. The temperature distribution around the support protrusion 1 of the belt 2, that is, The temperature difference between the front side joining piece 23a and the rear side joining piece 23b, the temperature difference between the upper and lower sides of the front side joining piece 23a, and the upper and lower sides of the rear side joining piece 23b can be predicted.

  From the prediction result of the above simulation analysis, the position of the gate 7 of the cavity 19 is set as shown in FIG. 6B rather than being set on the side surface of the main body 25 of the hook-shaped protrusion 4a as shown in FIG. It is confirmed that the difference in the pressure distribution around the support protrusion 1 of the belt 2 can be reduced by setting the position corresponding to the opening of the through hole 6 of the support protrusion 1.

  FIG. 21 shows that the design of the joint 5 of the hook-shaped protrusion 4a is set so that the thickness of the front joint piece 23a and the rear joint piece 23b is the same as possible as shown in FIG. When the position is set to a position corresponding to the opening of the through hole 6 of the support protrusion 1 as shown in FIG. 6B, the resin is injected into the cavity 19 after injection of the resin from the gate 7 to the cavity 19 is started. This shows the time course of the flow of the resin until it is 100% filled. From FIG. 21, it can be predicted that the tip end portion of the locking claw 26 is formed last in the hook-shaped protrusion 4a.

  FIG. 22 shows the pressure distribution in the cavity 19 when the resin is completely filled in the cavity 19 when the design of the joint 5 of the hook-shaped protrusion 4a and the position of the gate 7 are set in the same manner as in FIG. Is shown. In the cavity 19 for forming the hook-shaped protrusion 4a, the pressure at the tip of the locking claw 26 is the lowest, and the pressure difference between the front joint piece 23a and the rear joint piece 23b is expected to be small. The

  FIG. 23 shows the relationship between the pressure measured by the sensor at the position shown in FIG. 6B and the injection molding time when pressure is measured under the same conditions as in FIG. Of the pressure around the support protrusion 1, that is, the pressure difference between the front joint piece 23a and the rear joint piece 23b, the pressure difference between the top and bottom of the front joint piece 23a, and the top and bottom of the rear joint piece 23b. Can be predicted. Further, FIG. 24 shows the relationship between the average temperature measured by the sensor at the position shown in FIG. 6B and the injection molding time. The temperature distribution around the support protrusion 1 of the belt 2, that is, The temperature difference between the front side joining piece 23a and the rear side joining piece 23b, the temperature difference between the upper and lower sides of the front side joining piece 23a, and the upper and lower sides of the rear side joining piece 23b can be predicted.

  From the prediction result of the simulation analysis, the design of the joint 5 of the hook-shaped protrusion 4a is set so that the thickness of the front joint piece 23a is thicker than that of the rear joint piece 23b as shown in FIG. As shown in FIG. 5B, the thicknesses of the front side joining piece 23a and the rear side joining piece 23b are set to be as equal as possible, and the position of the gate 7 of the cavity 19 is set as shown in FIG. It is better to set the belt 2 at a position corresponding to the opening of the through hole 6 of the support projection 1 as shown in FIG. 6B than to set the side surface of the main body 25 of the hook-shaped projection 4a. It is confirmed that the difference in the pressure distribution around the support protrusion 1 can be reduced.

  Next, the results of simulation analysis of the deformation amount of the locking claw 26 of the hook-shaped protrusion 4a and the deformation amount of the joint portion 5 are shown in FIGS. FIG. 25 shows twist deformation (deformation of the arrow “Hook1” in FIG. 28) in the front-rear direction (longitudinal direction of the belt 2) of the locking claw 26, and FIG. 28 is a deformation (in the direction of “Hook2” in FIG. 28) of FIG. 28, and FIG. 27 is a deformation of the deformation of the joint 5 in the front-rear direction (longitudinal direction of the belt 2). (Deformation of arrow) is shown respectively. 25 to 27, the shrinkage rate obtained from the change in length is shown by a bar graph, and the average value (RMS) of the deformation angles obtained from the deformation angles in the X, Y, and Z directions is shown by a broken line. . “Org” is designed so that the joint 5 of the hook-shaped protrusion 4a is designed so that the thickness of the front joining piece 23a is larger than that of the rear joining piece 23b as shown in FIG. 7 is set on the side surface of the main body portion 25 of the hook-shaped protrusion 4a as shown in FIG. 6A, and “cct” indicates the design of the joint portion 5 of the hook-shaped protrusion 4a as shown in FIG. Thus, the thickness of the front side joining piece 23a and the rear side joining piece 23b is set as much as possible, and the position of the gate 7 of the cavity 19 is set to the position of the main body portion 25 of the hook-shaped protrusion 4a as shown in FIG. “Cpg” is set on the side, and the design of the joint 5 of the hook-shaped protrusion 4a is set so that the thickness of the front joint piece 23a is larger than that of the rear joint piece 23b as shown in FIG. The position of the gate 7 passes through the support protrusion 1 as shown in FIG. “Cct & cpg” is set to a position corresponding to the opening of the hole 6, and the design of the joint portion 5 of the hook-shaped protrusion 4 a is such that the thickness of the front joint piece 23 a and the rear joint piece 23 b is as shown in FIG. The gate 7 is set to the same position as possible, and the position of the gate 7 is set to a position corresponding to the opening of the through hole 6 of the support protrusion 1 as shown in FIG. Represents the diameter (unit: mm) of the through hole 6 formed in the support protrusion 1 of the belt 2.

  As shown in FIGS. 25 to 27, the design of the joint portion 5 of the hook-shaped protrusion 4a is such that the thickness of the front joint piece 23a and the rear joint piece 23b is as the same as shown in FIG. 5B. 6 and the position of the gate 7 is set to a position corresponding to the opening of the through-hole 6 of the support protrusion 1 as shown in FIG. 6B, the “cct & cpg” can reduce the deformation angle RMS. Is confirmed.

  FIG. 28 to FIG. 32 show deformation prediction diagrams of the hook-shaped protrusions 4a obtained from the results of the above simulation analysis. The design shape is displayed in gray and the deformation shape is displayed in green. Is magnified twice. 28 and 29, the design of the joint portion 5 of the hook-shaped protrusion 4a is set so that the front joint piece 23a is thicker than the rear joint piece 23b as shown in FIG. The position of the gate 7 is set on the side surface of the main body 25 of the hook-shaped protrusion 4a as shown in FIG. 6A. FIG. 30 shows the design of the joint 5 of the hook-shaped protrusion 4a. As shown in FIG. 6A, the thicknesses of the front side joining piece 23a and the rear side joining piece 23b are set to be as equal as possible, and the position of the gate 7 of the cavity 19 is set to the main body portion 25 of the hook-shaped protrusion 4a as shown in FIG. FIG. 31 shows the design of the joint 5 of the hook-shaped protrusion 4a so that the front joint piece 23a is thicker than the rear joint piece 23b as shown in FIG. 5A. The position of the gate 7 passes through the support protrusion 1 as shown in FIG. FIG. 32 shows the design of the joint portion 5 of the hook-shaped protrusion 4a so that the thickness of the front joint piece 23a and the rear joint piece 23b is as large as possible, as shown in FIG. 5B. The gates 7 are set so as to be the same, and the position of the gate 7 is set to a position corresponding to the opening of the through hole 6 of the support protrusion 1 as shown in FIG.

  And by performing simulation analysis of the injection molding process by CAE as described above, the optimal position as the position of the gate 7 and the shape of the joint portion 5 when the projection body 4 is outsert-molded can be obtained. In the present invention, based on the analysis result, the position of the gate 7 is set to a position corresponding to the opening of the through hole 6 of the support protrusion 1, and the design of the joint portion 5 is determined between the front joint piece 23 a and the rear joint piece 23 b. Outsert molding of the protrusions 4 is performed by setting the thicknesses to be as equal as possible.

BRIEF DESCRIPTION OF THE DRAWINGS It shows an example of embodiment of the belt with a protrusion obtained by this invention, (a) is a front view, (b) is a II line sectional view, (c) is a ROLL line sectional view. is there. It is a partially expanded front sectional view same as the above. It is a partial sectional view showing an example of an embodiment of a molding die used for outsert molding of the present invention. FIG. 2 shows a molding die as described above, wherein (a) is a partial cross-sectional view, and (b) is a cross-sectional view taken along a line. FIG. 3A is a design diagram of a joint portion of a hook-shaped protrusion, and FIG. 4A is a diagram in which the thickness of a front joint piece is designed to be thicker than the thickness of a rear joint piece, and FIG. It is the figure which designed the thickness of the side joining piece as equal as possible. FIG. 2 shows a gate position of a molding die and a sensor installation position when molding a hook-shaped protrusion, and FIG. 4A is a diagram in which the gate position is set corresponding to the main body of the hook-shaped protrusion. (B) is the figure which set the gate position corresponding to opening of the through-hole provided in the support protrusion part of the belt. It is the figure which output from a personal computer and analyzed the result of having simulated and analyzed injection molding, and is a figure printed, and shows the filling state of resin inside a mold. It is the figure which output the result of having simulated and simulated injection molding from a personal computer, and was color-printed, and shows the pressure distribution inside a molding die. It is the figure which output from a personal computer and analyzed the result of having simulated and analyzed injection molding, and is a color print, and shows the filling state of the resin inside the cavity which molds a hook-shaped projection. It is the figure which output the result of having simulated and analyzed injection molding from a personal computer, and was color-printed, and shows the pressure distribution inside the cavity which shape | molds a hook-shaped protrusion. It is the figure which output from the personal computer and analyzed the result analyzed by simulating injection molding, and is a color print, and shows the relationship between the pressure measured with the sensor around the support protrusion part of a belt, and the injection elapsed time. It is the figure which output the result of having simulated and analyzed the injection molding from the personal computer, and was color-printed, and shows the relationship between the temperature measured by the sensor around the belt support protrusion and the injection elapsed time. It is the figure which output from a personal computer and analyzed the result of having simulated and analyzed injection molding, and is a color print, and shows the filling state of the resin inside the cavity which molds a hook-shaped projection. It is the figure which output the result of having simulated and analyzed injection molding from a personal computer, and was color-printed, and shows the pressure distribution inside the cavity which shape | molds a hook-shaped protrusion. It is the figure which output from the personal computer and analyzed the result analyzed by simulating injection molding, and is a color print, and shows the relationship between the pressure measured with the sensor around the support protrusion part of a belt, and the injection elapsed time. It is the figure which output the result of having simulated and analyzed the injection molding from the personal computer, and was color-printed, and shows the relationship between the temperature measured by the sensor around the belt support protrusion and the injection elapsed time. It is the figure which output from a personal computer and analyzed the result of having simulated and analyzed injection molding, and is a color print, and shows the filling state of the resin inside the cavity which molds a hook-shaped projection. It is the figure which output the result of having simulated and analyzed injection molding from a personal computer, and was color-printed, and shows the pressure distribution inside the cavity which shape | molds a hook-shaped protrusion. It is the figure which output from the personal computer and analyzed the result analyzed by simulating injection molding, and is a color print, and shows the relationship between the pressure measured with the sensor around the support protrusion part of a belt, and the injection elapsed time. It is the figure which output the result of having simulated and analyzed the injection molding from the personal computer, and was color-printed, and shows the relationship between the temperature measured by the sensor around the belt support protrusion and the injection elapsed time. It is the figure which output from a personal computer and analyzed the result of having simulated and analyzed injection molding, and is a color print, and shows the filling state of the resin inside the cavity which molds a hook-shaped projection. It is the figure which output the result of having simulated and analyzed injection molding from a personal computer, and was color-printed, and shows the pressure distribution inside the cavity which shape | molds a hook-shaped protrusion. It is the figure which output from the personal computer and analyzed the result analyzed by simulating injection molding, and is a color print, and shows the relationship between the pressure measured with the sensor around the support protrusion part of a belt, and the injection elapsed time. It is the figure which output the result of having simulated and analyzed the injection molding from the personal computer, and was color-printed, and shows the relationship between the temperature measured by the sensor around the belt support protrusion and the injection elapsed time. It is a graph which estimates the twist deformation | transformation of the latching claw of a hook-shaped protrusion. It is a graph which predicts the fall deformation | transformation of the latching claw of a hook-shaped protrusion. It is a graph which predicts the fall deformation of the junction part of a hook-shaped projection. It is the figure which output the result of having simulated and analyzed injection molding from a personal computer, and was color-printed, and shows the deformation | transformation prediction of a hook-shaped protrusion. It is the figure which output the result of having simulated and analyzed injection molding from a personal computer, and was color-printed, and shows the deformation | transformation prediction of a hook-shaped protrusion. It is the figure which output the result of having simulated and analyzed injection molding from a personal computer, and was color-printed, and shows the deformation | transformation prediction of a hook-shaped protrusion. It is the figure which output the result of having simulated and analyzed injection molding from a personal computer, and was color-printed, and shows the deformation | transformation prediction of a hook-shaped protrusion. It is the figure which output the result of having simulated and analyzed injection molding from a personal computer, and was color-printed, and shows the deformation | transformation prediction of a hook-shaped protrusion. It is a partial front view which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support protrusion 2 Belt 3 Molding die 4 Projection body 5 Joint part 6 Through-hole 25 Body part 26 Locking claw

Claims (4)

A protrusion formed by resin outsert molding in a state where both sides of the support protrusion in the longitudinal direction of the belt are sandwiched between bifurcated joints of the base on the support protrusion integrally protruding on the back surface of the belt. A belt with protrusions that are integrally provided upright on the back of the belt. The support protrusion has a through hole that penetrates in the longitudinal direction of the belt, and is bifurcated so as to sandwich both sides of the support protrusion in the longitudinal direction of the belt The protrusion-attached belt is characterized in that the joint portion is formed by outsert molding, and the bifurcated joint portion is connected and integrated with the resin filled in the through hole . The belt with protrusions according to claim 1, wherein a width of the joint portion of the protrusion is narrower than that of the support protrusion of the belt.   The protrusion-provided belt according to claim 1 or 2, wherein the protrusion is formed in a shape in which a main body portion having an inverted V-shaped cross section is provided on a bifurcated joint portion of a base portion. The belt with protrusions according to claim 1, wherein the protrusion is formed in a shape in which a bifurcated joint portion is provided at a base portion and a locking claw that protrudes in a horizontal direction is provided at an upper end portion.

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