JP5532721B2 - Drum pad and manufacturing method thereof - Google Patents

Description

  The present invention relates to a drum pad used as an electronic drum pad or a practice pad, and a method of manufacturing the same.

  Conventionally, a drum pad applied to an electronic drum or the like is known. In this type of drum pad, there is a demand to make the hitting feel as close as possible to that of an acoustic drum pad, and improvements in the material of the drum pad main body are being studied.

  Incidentally, electronic drums are known in which a base portion to which a sensor for detecting the impact of a drum pad is attached is provided on the back surface of the main body portion of the drum pad. For example, in the electronic drum pad of Patent Document 1 below, an iron plate as a base portion is fixed to the back surface of the main body portion of the drum pad with an adhesive or the like. A sensor board having a sensor fixed to the back surface is fixed to the back surface of the iron plate.

  The base portion to which the sensor is fixed is usually fixed to the main body portion of the drum pad with an adhesive or the like. In particular, the base portion needs to be firmly fixed to the main body portion of the drum pad so that the hitting feel and the detection of the hitting signal can be performed satisfactorily.

JP 2005-227535 A

  However, as a material for the drum pad main body, there are some materials that are difficult to adhere to as long as the hitting feel is limited. Therefore, the types of materials that are actually used have been limited. For example, a rubber material such as silicone does not adhere well to a general adhesive, and therefore, for example, it is difficult to bond a base portion whose bonding surface is a metal surface, and a double-sided tape for silicone and an adhesive for silicone are not suitable. In addition to being very expensive, it is difficult to ensure the necessary adhesive strength. Therefore, in practice, it has been an obstacle to adopting a rubber material such as silicone as the material of the drum pad body.

  Furthermore, when examining the material used for the drum pad body, how to ensure that the surface material, etc., disposed on the surface of the body, which is the striking side, is securely bonded to the body. It is necessary to consider whether or not.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is to realize a good hitting feel and firmly bond the base portion to the back surface of the rubber pad portion. It is an object of the present invention to provide a drum pad and a method of manufacturing the same.

  In order to achieve the above object, the drum pad according to claim 1 of the present invention includes a main body portion (14) made of rubber and a back surface (14b) which is a surface opposite to the side to be struck of the main body portion. And at least a member (41) in which a plurality of holes (41a) penetrating in the front and back direction are formed, and the side of the member is the back surface (32b) of the back fabric material (32b). ) And a base portion (40) fixed via a fixing layer (31) made of an adhesive or an adhesive, and the back side cloth-like material is impregnated with the rubber and the back side cloth The main body is bonded to the surface (32a) of the shaped material.

  Preferably, the disposition density of the holes is higher as the position is farther from the outer edge (41b) of the base portion (claim 2).

  Preferably, a front side cloth-like material (20) having a surface (20a) which is a surface to be struck and a back surface (20b) opposite to the front surface, and thinner than the front side cloth-like material and the front side cloth A stretchable resin material (12) that can be heat-sealed to the shaped material, and the molten resin material is included in a region that includes the front surface and does not include the back surface of the front cloth-like material. A first layer portion (21) formed by solidifying the resin material and the front side cloth-like material integrally is formed, and is the remaining entire region other than the first layer portion of the front-side cloth-like material, A second layer portion (22M2) impregnated with the rubber is formed between the main body portion and the first layer portion, and the main body portion is joined to the back surface of the front cloth material. (Claim 3).

  In order to achieve the above object, a drum pad manufacturing method according to claim 4 of the present invention is provided on a main body portion made of rubber and a back surface which is a surface opposite to the side to be struck of the main body portion. A drum pad having a backside cloth-like material, wherein the member side of the base portion having at least a member in which a plurality of holes penetrating in the front and back direction is formed on the back surface of the backside cloth-like material, A fixing step of fixing through a fixing layer made of an adhesive or an adhesive, and a liquid resin material or heat that becomes the rubber material from the surface side of the back-side cloth-like material with the base portion fixed to the back surface By casting and reacting softened unvulcanized rubber, the body portion is molded to impregnate the rubber into the backside cloth-like material, and the surface of the backside cloth-like material is joined to the body portion Characterized by having a molding process to make a state .

In order to achieve the above object, a drum pad manufacturing method according to claim 5 of the present invention includes a front cloth material having a surface which is a surface to be hit and a back surface opposite to the surface, and the front cloth. A stretchable resin material that is thinner than the material and can be heat-sealed to the front cloth material, a main body made of rubber, and a surface of the main body opposite to the side to be struck A drum pad having a backside cloth-like material provided on the back surface, wherein the resin material is heat-sealed to the surface of the front-side cloth-like material, whereby the front-side cloth-like material A heat fusion step of forming a first layer portion in which the molten resin material enters a region including the front surface and does not include the back surface, and the resin material and the front cloth material are solidified integrally; The member of the base portion having at least a member formed with a plurality of holes penetrating in the front and back direction Side, on the back surface of the back side cloth-like material, a fixing step of fixing through a fixing layer formed by the pressure-sensitive adhesive or an adhesive, said first layer portion in the region that does not include and the back comprise said surface forming A liquid resin material or a heat-softened unvulcanized material to be the rubber material between the back surface of the front fabric material and the surface of the back fabric material with the base portion fixed to the back surface. By casting and reacting rubber to form the main body part, the remaining part other than the first layer part of the front-side cloth-like material is between the main body part and the first layer part. Forming a second layer part impregnated with rubber, bringing the back surface of the front side cloth-like material into contact with the main body part, impregnating the back side cloth-like material with the rubber, and forming the back side cloth-like material; Having a molding step of bringing the surface of the material and the main body into a joined state. And butterflies.

  Preferably, the rubber is foamed rubber or silicone rubber having a siloxane bond. (Claims 6-9).

  In addition, the code | symbol in the said parenthesis is an illustration.

  According to the first aspect of the present invention, according to the first and fourth aspects of the present invention, a good hitting feel is achieved and the base portion is firmly bonded to the back surface of the rubber pad portion. can do.

  According to the second aspect of the present invention, the closer to the center of gravity (center) of the base portion, the better the gas can escape, and the fixing strength can be made closer to the entire surface.

  According to claim 3, it is possible to prevent the hitting surface from being soiled and to maintain durability.

  According to the fifth aspect of the present invention, it is possible to realize a good hitting feel, to firmly bond the base portion to the back surface of the rubber pad portion, and to prevent the hitting surface from being soiled and to be durable. Can be maintained. Further, since both the front and back sides can be processed in parallel in a single molding process, the manufacturing process can be simplified.

  According to the sixth and eighth aspects, it is effective to make a softly bouncy striking surface.

  According to the seventh and ninth aspects, it is effective not only for casting as a liquid rubber but also for producing a drum pad excellent in resilience and weather resistance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view (FIG. (A)) and sectional view (FIG. (B)) of a drum pad according to an embodiment of the present invention. Cross-sectional view of resin material, front side cloth-like material (figure (a), (b)), cross-sectional view of temporary composite layer (figure (c)) which is in the previous stage of front-side composite layer, composite layer with release paper It is sectional drawing (figure (d)) and sectional drawing (figure (e)) of a base part. It is sectional drawing (figure (a)) which shows the mode of shaping | molding by the metal mold | die of the drum pad except a base part, and a schematic diagram (figure (b)) of a front side composite layer. It is a figure (Drawing (a)-(c)) which shows the decay time of the acceleration of the vibration of a base part based on the actual measurement at the time of "no vibration control type", "non-restraint type", and "restraint type". It is a figure (Drawing (a)-(c)) which shows the amplitude of vibration of a base part for every frequency of "non-damping type", "non-restraining type", and "restraining type" based on actual measurement at the time of hitting. It is a figure (a figure (a), (b)) showing a modification of a molding method by a die of a drum pad. It is sectional drawing (a figure (a)) which shows typically the structure of the drum pad which employ | adopts the base part which has a gas vent hole, and is a figure (a figure (b)) which shows the shaping | molding method by the metal mold | die of the same drum pad.

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

  FIG. 1A is a schematic perspective view of a drum pad according to an embodiment of the present invention. The drum pad 10 is applied to, for example, a pad for an electronic drum or a striking input device that inputs striking data to obtain data for sound generation, and is hit with a stick 11 or the like. However, the present invention is not limited to this, and it may simply be placed on a table or the like and used for practice of batting. As an example of the size, for example, the diameter φ of the drum pad 10 is 260 mm, the thickness t is 20 mm, and a 10 inch or 12 inch snare or tom is assumed as an application. However, it is not restricted to these.

  FIG. 1B is a cross-sectional view schematically showing the configuration of the drum pad 10. As shown in FIG. 1B, the drum pad 10 is formed by laminating a pad portion 15, a back-side composite layer 30M2, and a base portion 40 from the upper side. The pad portion 15 is formed by forming a front-side composite layer 20M2 including a first layer portion 21 and a second layer portion 22M2 on the upper surface 14a of the main body portion 14. The direction of the drum pad 10 during performance is not limited, but for the sake of explanation, the up and down direction is referred to in the state shown in FIG. The upper side is the front side, and the lower side is the back side. Moreover, the thickness of each component is exaggerated, and the scale may be different from the actual one.

  The surface 20Ma of the front composite layer 20M2 is the upper surface of the drum pad 10, that is, the striking surface 10a. The back surface 20Mb of the front side composite layer 20M2 is bonded to the upper surface 14a of the main body portion 14. The first layer portion 21 and the second layer portion 22M2 in the front side composite layer 20M2 are divided into upper and lower portions at the boundary portion 23. The second layer portion 22M2 occupies the entire remaining area other than the first layer portion 21 in the front side composite layer 20M2. The front surface 20Ma and the back surface 20Mb of the front-side composite layer 20M2 are flat, but the boundary portion 23 is not necessarily flat, and may be flat or non-flat.

  The back-side composite layer 30M2 includes a back-side cloth material 32M2 and an adhesive 31 applied to the back surface 32b of the back-side cloth material 32M2. The front surface 32a of the back side cloth-like material 32M2 is joined to the lower surface 14b of the main body 14.

  Moreover, the base part 40 is provided under the back side composite layer 30M2. The base part 40 has a three-layer structure in which a resin layer 43 is interposed between a first metal plate 41 on the front side and a second metal plate 42 on the back side. The upper surface 40a of the base portion 40, which is the upper surface of the first metal plate 41, is opposed to the rear surface 32b of the back-side cloth material 32M2, and the upper surface 40a is bonded to the rear surface 32b by the adhesive 31.

  On the lower surface 40b of the base portion 40, which is the lower surface of the second metal plate 42, the impact sensor 19 is fixed substantially at the center position. The impact sensor 19 includes a piezoelectric element or the like, converts vibrations of the base portion 40 into an electrical signal, and detects the signal as presence / absence or strength of the impact. However, any configuration may be used as long as the impact is detected by vibration, and the configuration and arrangement position are not limited. When the striking surface 10 a is hit, the base portion 40 vibrates and is detected by the hit sensor 19. A trigger is detected based on the detection signal, and a drum sound can be generated by a musical sound generator (not shown).

  FIGS. 2A and 2B are cross-sectional views of the resin material 12 and the front cloth material 20. FIG. 2C is a cross-sectional view of the provisional composite layer that is in the previous stage of the front-side composite layer 20M2.

  In the raw material stage, the pad portion 15 includes a resin material 12, a front cloth material 20, and a rubber material 13 (see FIG. 3A) that is a molding material. The rubber material 13 corresponds to the main body portion 14 before molding. The resin material 12 and the front cloth material 20 are both sufficiently thin with respect to the main body portion 14, and the resin material 12 is thinner than the front cloth material 20.

  The front cloth material 20 (see FIG. 2B) is a material that is stretchable in two directions (two-way stretch), and a knit material is preferably used. May be. In these cases, the rebound direction of the stick 11 is the same as that of the acoustic.

  Here, the knit refers to a fabric in which loops of a curved shape are connected in the horizontal direction or the vertical direction, such as a knitted fabric. Nonwoven fabric refers to a fabric in which fibers are bonded together without being woven or knitted. The type of fiber is not limited, and a non-woven fabric made of natural fiber or synthetic fiber may be used.

  As the resin material 12 (see FIG. 2A), an elastic film-like resin material that can be heat-sealed to the front fabric material 20, for example, polyolefin is employed. In addition, it may be a polyurethane-based resin, a mixture of polyurethane and polyester, or a mixture of polyurethane and nylon.

  As the rubber material 13 (see FIG. 3A), silicone rubber having a siloxane bond, for example, foamable silicone RTV rubber is suitable.

  As will be described later, as the rubber material 13 is molded into the main body portion 14, the temporary second layer portion 22M1 in the temporary composite layer 20M1 shown in FIG. It becomes the second layer portion 22M2 in the front side composite layer 20M2 shown in FIG.

  FIG. 2D is a cross-sectional view of the composite layer with release paper. The composite layer 35 with release paper is composed of the temporary composite layer 30M1 and the release paper 33. In the temporary composite layer 30M1, the adhesive 31 is added to the lower surface of the temporary back cloth material 32M1 by coating or the like, and the release paper 33 is stuck from the back side of the adhesive 31. As will be described later, as the rubber material 13 is molded into the main body portion 14, the temporary backside cloth material 32M1 in the temporary composite layer 30M1 shown in FIG. It becomes the back side cloth-like material 32M2 in the back side composite layer 30M2 shown in 1 (b).

  The material of the temporary back fabric material 32M1 is the same as that of the front fabric material 20 (see FIG. 2B), and a knit material is adopted, but a non-woven fabric may be used. It should be noted that the front fabric material 20 may be knit and the temporary back fabric material 32M1 may be a non-woven fabric, or vice versa. The provisional back side cloth-like material 32M1 is not essential, and may be a cloth other than knit or non-woven fabric, or may be felt.

  The pressure-sensitive adhesive 31 is preferably, for example, acrylic, but has adhesiveness to the first metal plate 41 such as rubber-based, silicone-based, hot-melt, etc. according to the material used for the first metal plate 41. A good one should be adopted.

  FIG. 2E is a cross-sectional view of the base portion 40. Both the first metal plate 41 and the second metal plate 42 have a thickness of t1 and the same configuration. The metal plates 41 and 42 are general steel plates made of materials such as aluminum, stainless steel, and iron. The thickness of the resin layer 43 serving as the intermediate plate is t2. Resins that can be employed as the resin layer 43 are, for example, vinyl chloride, acrylic resin, and the like, but are not limited thereto. For example, the first metal plate 41 and the resin layer 43 are bonded to each other, and the second metal plate 42 and the resin layer 43 are bonded to each other, for example, by attaching the resin layer 43 formed in a sheet shape to the metal plates 41 and 42 on both sides. This is done by bonding with tape or the like.

  Here, the base portion 40 is a vibration-damping steel plate having a three-layer structure with the resin layer 43 interposed therebetween, which has improved damping effect, particularly high-frequency damping effect. The thickness t1 of the metal plates 41 and 42 is in the range of 0.3 to 2.3 mm (for example, 0.8 mm) in order to exert such a damping effect as necessary and sufficiently, and to keep the cost low. The thickness t2 of the resin layer 43 is set in a range of 0.1 to 0.5 mm (for example, 0.5 mm).

  That is, with respect to the thickness t1 of the metal plates 41 and 42, the above range is selected as a range in which the metal plate 41 and 42 are vibrated appropriately by hitting the hitting surface 10a. In addition, as for the thickness t2 of the resin layer 43, if the thickness t2 is less than 0.1 mm, the vibration damping effect is reduced, and the resin layer 43 is too thin to be manufactured. On the other hand, even if the thickness t2 is greater than 0.5 mm, the effect does not change much. If the thickness t2 is too thick, the material cost of the resin is wasted, so the above range is selected. Of course, even if it is thicker than 0.5 mm, the damping function can be achieved, so it is not necessary to limit the thickness to 0.5 mm or less.

  From the viewpoint of reducing the waste of the resin and reducing the cost, the thickness t2 of the resin layer 43 is preferably thinner than the thinner thickness t1 of the metal plates 41 and. The metal plates 41 and 42 need only be within the above range, and need not have the same thickness.

  Next, a method for manufacturing the drum pad 10 will be described.

  FIG. 3A is a cross-sectional view showing how the drum pad 10 excluding the base portion 40 is molded by a mold.

  First, a resin material 12, a front cloth material 20, and a composite layer 35 with release paper formed in a predetermined shape (for example, a circle) and a predetermined thickness are prepared (FIGS. 2A, 2B, 2D). )reference). The thickness of the resin material 12 is about 0.1 mm, and the thickness of the front cloth material 20 is about 0.2 mm. In addition, you may cut out circularly with the main-body part 14 after shaping | molding the main-body part 14, without unifying the original shape in planar view of the resin material 12, the front-side cloth-like material 20, and the composite layer 35 with a release paper.

  Then, the back surface 12b (see FIG. 2A) side of the resin material 12 is heat-sealed to the front surface 20a side of the front fabric material 20. This is achieved, for example, by passing a superposition of the resin material 12 and the front cloth material 20 between two heated rollers.

  Here, it is assumed that the melting point of the resin material 12 is lower than that of the front cloth material 20. Moreover, the resin material 12 is thinner than the front cloth material 20. Therefore, when the fusion treatment is performed at a temperature at which the resin material 12 is melted, as shown in FIG. 2C, the melted resin material 12 enters a region on the side including the surface 20 a of the front cloth material 20. The region is a region from the surface 20 a to the boundary portion 23 corresponding to the thickness of the resin material 12. And when it cools in this state, in the area | region where the resin material 12 entered, the 1st layer part 21 formed by solidifying the resin material 12 and the upper half part of the front side cloth-like material 20 integrally is formed. On the other hand, a region other than the first layer portion 21 (region from the boundary portion 23 to the back surface 20b of the front fabric material 20) of the front fabric material 20 is a provisional second layer portion 22M1 made of only a knit material.

  In the temporary composite layer 20M1 thus formed, the surface that was the surface 20a of the front cloth-like material 20 becomes the surface 20Ma that is also the surface of the first layer portion 21 into which the resin material 12 has entered. On the other hand, the back surface 20b of the front fabric material 20 becomes the back surface 20Mb of the temporary composite layer 20M1 as it is.

  Next, as shown in FIG. 3A, in the mold 24, the composite layer 35 with release paper is laid on the bottom of the mold 24 so that the temporary back cloth material 32M1 is on the upper side, and the temporary composite The layer 20M1 is installed on the ceiling side of the mold 24 so that the provisional second layer portion 22M1 is on the lower side. Then, the rubber material 13 is cast between the composite layer 35 with release paper and the temporary composite layer 20M1, and reacted to form the main body portion 14.

  Specifically, first, the liquid A agent and B agent to be a two-component RTV rubber are weighed and mixed well. Next, the mixed agent A and agent B are injected into the mold 24, and the mold 24 is closed and foamed and solidified at room temperature. The space S1 initially formed on the back surface 20Mb side of the temporary composite layer 20M1 in the mold 24 is eventually filled with the rubber material 13 foamed.

  At the stage where the rubber material 13 is foamed, the rubber material 13 impregnates the temporary backside cloth material 32M1 of the temporary composite layer 30M1 from above. The impregnation stops at the boundary with the adhesive 31. When the rubber material 13 is foamed and reaches the ceiling, this time, the rubber material 13 is impregnated from the back surface 20Mb of the temporary composite layer 20M1 into the region of the temporary second layer portion 22M1. However, since the resin material 12 has entered the first layer portion 21, the rubber material 13 is not impregnated, and the impregnation stops at the boundary portion 23. In this sense, the first layer portion 21 serves as a stopper for preventing the components of the rubber material 13 from being exposed to the surface 20Ma side of the temporary composite layer 20M1. Thereafter, annealing is performed.

  Thereby, on the upper side of the main body part 14, the provisional second layer part 22M1 becomes the second layer part 22M2 impregnated with the rubber material 13, and as shown in FIG. The front-side composite layer 20M2 is formed with the layer portion 21. Further, the pad portion 15 is formed in a state where the back surface 20Mb of the front-side composite layer 20M2 is bonded to the upper surface 14a of the main body portion 14 made of the foamed and solidified rubber material 13.

  On the other hand, on the lower side of the main body 14, the temporary backside cloth material 32M1 becomes a backside cloth material 32M2 impregnated with the rubber material 13, and the backside cloth material 32M2 and the adhesive 31 form the backside composite layer 30M2. The In addition, the surface 32a of the back-side cloth material 32M2 is joined to the lower surface 14b (see FIG. 1B) of the main body portion 14 made of the foamed and solidified rubber material 13.

  Here, the portion impregnated with the rubber material 13 (the second layer portion 22M2, the back side cloth-like material 32M2) and the main body portion 14 are connected to each other, and the knit and the nonwoven fabric are connected through the both layers. Is expensive. In addition, since an adhesive or the like for joining is unnecessary, the manufacturing process can be simplified. Note that the configuration and orientation of the mold 24 are not limited to those illustrated.

  FIG. 3B is a schematic diagram of the front-side composite layer 20M2. Since the fiber 20c of the front cloth material 20 enters the first layer portion 21 and the second layer portion 22M2, and it bites in like an anchor, it functions as a bridge that connects the two layers and is reinforced. . This not only makes the first layer portion 21 difficult to peel off from the second layer portion 22M2, but also functions to reinforce and strengthen both layers, making it difficult to tear or tear at the time of impact. These are the same regardless of whether the front fabric material 20 is knit or non-woven.

  In this way, after the surface-side composite layer 20M2 and the back-side composite layer 30M2 are joined to the front side and the back side of the main body part 14 are taken out from the mold, a separately prepared base part 40 is attached. That is, the release paper 33 attached to the back side composite layer 30M2 is peeled off to expose the adhesive 31, and the upper surface 40a (the upper surface of the first metal plate 41) of the base portion 40 is adhered or adhered thereto. As a result, the base portion 40 is fixed to the back surface 32b of the back-side cloth material 32M2, and the drum pad 10 is completed.

  When striking the striking surface 10a, in addition to the stretchability of the resin material 12 itself, a large stretchability is obtained by the 2-way stretch characteristics of the front cloth-like material 20. As a result, the hit location is locally deformed and the restoring force is strong, so that the hit feeling is not too hard, and the stick 11 bounces well.

  By the way, although the base part 40 in this Embodiment has improved the damping effect with the 3 layer structure, the damping effect is compared with the thing which is not a 3 layer structure. This three-layer structure is called “restraint type”. As a comparison object, a structure in which the resin layer 43 is simply provided on the back side of the first metal plate 41, that is, a structure in which the second metal plate 42 is removed from the base portion 40 is referred to as “unconstrained type”. Further, the first metal plate 41 alone, that is, the one in which the resin layer 43 and the second metal plate 42 are removed from the base portion 40 and the damping function is eliminated is referred to as a “non-damping type”.

4 (a), 4 (b), and 4 (c) show the decay time of the acceleration of the vibration of the base 40 based on the actual measurement at the time of “no vibration control type”, “non-restraint type”, and “restraint type”. FIG. The horizontal axis represents elapsed time (s), and the vertical axis represents vibration acceleration (m / sec ² ). 5 (a), 5 (b), and 5 (c) show the vibration amplitude of the base unit 40 for each frequency based on the actual measurement at the time of “no vibration control type”, “non-restraint type”, and “restraint type”. FIG. The horizontal axis represents vibration amplitude (dB), and the vertical axis represents vibration frequency (Hz).

  At the time of actual measurement, the acceleration pickup was placed at the center position of the back surface of the base portion 40 (which is either one layer, two layers or three layers depending on the mold), and the center of the striking surface 10a was hit with a constant load. An electrogalvanized steel plate (SECC) was adopted as the first metal plate 41, and vinyl chloride was adopted as the resin layer 43.

  The actually measured acceleration in this case indicates the degree of vertical displacement of the base portion 40, and is a scale indicating the intensity or energy of vibration. As can be seen from FIGS. 4A to 4C, the vibration is not easily attenuated in the “non-vibration type”, and the vibration continues after 0.2 s. The “unconstrained type” is a little faster and almost attenuates around 0.2 s. In the “constrained type”, it quickly decays and becomes almost zero around 0.02 s. In order to realize good vibration with a large damping effect with less noise component, it is preferable that the vibration of the base portion 40 converges to almost zero within 0.1 s. Meet.

  Further, in order to exert a preferable vibration damping effect, a damping effect is important at a high frequency, particularly in a frequency range of 80 to 350 Hz. As shown in FIG. 5A, in the “non-vibration type”, the peak of resonance near 100 Hz is very sharp, and there is also a peak at 200 to 350 Hz. The same tendency is observed in the “unconstrained type” shown in FIG. 5B, but the peak of the mountain is slightly reduced. On the other hand, in the “unrestrained type” shown in FIG. 5C, there is a small mountain in the region lower than 80 Hz that does not affect the sound generation of the hitting sound, but there is no resonance mountain in the high frequency region. Excellent damping effect is observed.

  According to the present embodiment, the resin material 12 is heat-sealed to the front cloth-like material 20 to create the temporary composite layer 20M1, and further, the rubber material between the composite layer 35 with release paper and the temporary composite layer 20M1. 13 was foamed and solidified to form the main body 14.

  Thereby, in the drum pad 10 in the previous stage to which the base portion 40 is bonded, the back side cloth-like material 32M2 made of a knit material is impregnated with the rubber 13, and the main body portion 14 is applied to the surface 32a of the back-side cloth-like material 32M2. Is in a bonded state, and the adhesive 31 is applied to the back surface 32b of the back-side cloth-like material 32M2.

  Therefore, even if the adhesive 31 is not directly attached to the main body 14 made of rubber 13, it can be attached to the main body 14 via the back-side cloth material 32M2. As a result of the fact that the metal can be fixed using the non-special pressure-sensitive adhesive 31, the base portion 40 having the metal surface as the surface to be bonded is firmly against the back surface of the rubber pad portion 15 (the lower surface 14b of the main body portion 14). Can be allowed to adhere to. Moreover, since the main body portion 14 is made of the rubber material 13 which is silicone rubber, the coefficient of restitution is large and the hit feeling is good.

  Further, the first layer portion 21 into which the resin material 12 has entered and the second layer portion 22M2 impregnated with the rubber material 13 form the front side composite layer 20M2, and the front side composite layer 20M2 is basically made of a knit material or the like. It becomes as. Therefore, the rebound direction of the stick 11 becomes the same as that of the acoustic drum, and a natural hitting feel is realized. Furthermore, since the first layer portion 21 into which the resin material 12 has entered and solidified provides the striking surface 10a, not only is the quietness improved at the time of striking and the strength against striking is improved, but the knit material is improved by the resin material 12. By being protected, the dirt prevention effect is high. Therefore, the hitting surface 10a can be prevented from being soiled and durability can be maintained, and a natural and good hitting feel can be realized.

  In addition, since the rubber material 13 can be impregnated into the provisional back side cloth-like material 32M1 and the provisional second layer portion 22M1 in a single molding process, the front and back sides can be processed in parallel, and the production process Can be simplified. The process of foaming the rubber material 13 in two stages and impregnating the rubber material 13 with the temporary backside cloth-like material 32M1 and the temporary second layer portion 22M1 may be divided.

  In addition, by adopting a silicone rubber having a siloxane bond as the rubber 13, it is effective not only for casting as a liquid rubber but also for making a drum pad having excellent resilience and weather resistance. In addition, the use of foamed rubber as the rubber 13 is effective for making a softly resilient striking surface.

  Also according to the present embodiment, the base portion 40 disposed on the back side of the pad portion 15 (the lower surface 14b of the main body portion 14) and on which the impact sensor 19 is disposed includes the first metal plate 41 and the second metal plate. Since the resin layer 43 is interposed between the two layers 42, the mechanical striking sound is suppressed, the high-frequency damping effect by striking is increased, and an error occurs when sound is generated based on the striking detection. Pronunciation can be prevented. Moreover, there is little noise and it is uniform.

  Moreover, since the thickness t1 of the metal plates 41 and 42 is set to 0.3 to 2.3 mm and the thickness t2 of the resin layer 43 is set to 0.1 to 0.5 mm, the high-frequency damping effect is appropriately suppressed while suppressing the cost. Can be secured.

  Moreover, since the metal plates 41 and 42 have the same configuration, the number of parts can be reduced and the configuration can be simplified.

  By the way, in this Embodiment, what was provided in the back surface 32b (lower surface of provisional back side cloth-like material 32M1) of back side cloth-like material 32M2 was the adhering layer which consists of adhesive 31, However, it is not restricted to this, Adhesive It may be a fixed layer made of In that case, for example, a hot-melt type adhesive film is soaked into the lower half region of the temporary backside cloth material 32M1 and fused, and then fused to the base portion 40 before or after the body portion 14 is molded. To do. Alternatively, the liquid adhesive is applied to the base portion 40, the provisional back side cloth material 32M1 is placed on the applied surface, and the liquid adhesive is infiltrated into the lower half area of the provisional back side cloth material 32M1 and cured. Integrate. Thereafter, the rubber material 13 is soaked into the temporary backside cloth material 32M1 by the molding of the main body portion 14 and integrated.

  By the way, in this Embodiment, the main-body part 14 employ | adopted the rubber material 13 in order to improve a hit feeling, and to improve a weather resistance, but generally a urethane type film and a metal are adhere | attached on silicone type rubber. Is difficult. However, in the present embodiment, since the joining with the main body portion 14 is realized through the front side cloth-like material 20 such as the knit material and the back side cloth-like material 32M2, it is easy to adopt the silicone rubber.

  In particular, since the base portion 40 has the metal plates 41 and 42 and is heavy, conventionally, it has not been possible to employ silicone rubber that is difficult to be fixed, but by a fixing method using impregnation of the rubber 13, A combination of a damping steel plate having a multi-layer structure such as the base portion 40 and a silicone pad portion is easily realized.

  Furthermore, when the rubber material 13 impregnates the front cloth-like material 20, it is conceivable that the impregnation speed varies depending on the location. However, in the present embodiment, since the first layer portion 21 has a function of stopping the impregnation of the rubber material 13 at the boundary portion 23, there is no possibility that the impregnation region varies. Thereby, the striking surface 10a can be made into a smooth and uniform state.

  By the way, the molding method of the drum pad 10 using the mold is not limited to the above-described example, and a process as shown in FIG. 6 may be adopted.

  For example, as illustrated in FIG. 6A, the installation positions of the composite layer 35 with release paper and the temporary composite layer 20M1 in the mold 24 may be turned upside down at the time of molding.

  Alternatively, in the molding step shown in FIG. 3A, the composite layer 35 with release paper is set on the bottom of the mold 24. However, as shown in FIG. 6B, the temporary composite layer 30M1 is formed on the temporary composite layer 30M1. You may set what adhered base part 40 beforehand. That is, the release paper 33 is peeled off from the composite layer with release paper 35, and the base part 40 bonded is set on the bottom of the mold 24 and then molded in the same manner as described above.

  Various modifications of the rubber material 13 are also conceivable. In the above embodiment, foamed rubber is employed as the rubber material 13, but non-foamed rubber may be employed. For example, non-foamed silicone rubber made by curing liquid silicone without foaming, or non-foamed urethane rubber made by curing liquid urethane resin without foaming can be employed.

  For example, the molding step shown in FIG. 6A is adopted, and a lid mold (not shown) is provided in the mold 24. When the rubber material 13 which is a non-foamed resin is cast on the temporary composite layer 20M1, and the lid is put together with the composite layer 35 with the release paper, and then pressed and heat cured, the overall shape is defined by the lid. Thus, the main body 14 is formed. A part of the rubber material 13 protrudes from the gap between the lower mold and the lid mold.

  Further, an unvulcanized rubber compound may be employed as the rubber material 13 instead of a liquid resin. For example, a rubber material mainly composed of NR (natural rubber) and BR (butadiene rubber) can be used as the material of the rubber material 13. The blending ratio of the rubber material is, by weight, 3 parts of zinc oxide, 1 part of stearic acid, 6 parts of sulfur, and 6 parts of calcium carbonate as auxiliary materials to 40 parts of NR and 60 parts of BR. 15 parts, 10 parts carbon. These are kneaded with a roll to produce a rubber material 13 as a compound.

  For example, the molding step shown in FIG. 6A is adopted, and a lid mold (not shown) is provided in the mold 24. The rubber material 13 which is a non-foamed and unvulcanized rubber compound is placed on the temporary composite layer 20M1. Then, a cover mold is put together with the composite layer 35 with release paper, and pressure is applied and heated at 160 ° C. for 10 minutes. Then, the rubber material 13 is first softened and impregnated into the provisional back side cloth-like material 32M1 and the provisional second layer part 22M1 to become the back side cloth-like material 32M2 and the second layer part 22M2. A part of the rubber material 13 protrudes from the gap between the lower mold and the lid mold. Further, the vulcanization proceeds and the main body portion 14 is made of elastic rubber.

  As an example of adopting an unvulcanized rubber compound as the rubber material 13, a foaming agent (for example, 4,4′-oxybisbenzenesulfonyl hydrazide (decomposition temperature 160 ° C.)) is added. Also good. These are kneaded with a roll to produce a rubber material 13 as a compound.

  For example, the molding step shown in FIG. 6A is adopted, and a lid mold (not shown) is provided in the mold 24. The rubber material 13 which is a non-foamed, unvulcanized rubber compound is placed on the temporary composite layer 20M1. Then, a cover mold is put together with the composite layer 35 with release paper, and pressure is applied and heated at 160 ° C. for 10 minutes. Then, the rubber material 13 is first softened and impregnated into the provisional back side cloth-like material 32M1 and the provisional second layer part 22M1 to become the back side cloth-like material 32M2 and the second layer part 22M2. The rubber material 13 becomes a soft rubber material, and part of the rubber material 13 protrudes from the gap between the lower mold and the lid mold. Thereafter, since the softened rubber material starts to foam and vulcanization starts, the pressure of the mold is gradually lowered. Then, the softening rubber material expands due to the foaming pressure, and the space in the mold is foam-filled to form the main body portion 14.

  Even when the material of the rubber material 13 is changed, the installation position of the composite layer 35 with release paper and the temporary composite layer 20M1 in the mold 24 is not limited, and before the molding, the temporary composite layer is used. The base portion 40 may be bonded to 30M1.

  As described in the above embodiment, the material used for the main body 14 is not limited to foamable silicone rubber, and may be non-silicone rubber or non-foamable rubber. For example, for foaming, urethane rubber, natural rubber, butadiene rubber, or the like can be used. For non-foaming, silicone rubber, urethane rubber, natural rubber, butadiene rubber, etc. can be used.

  By the way, although the base part 40 was made into the 3 layer structure, it is good also as a 4 or more layer structure which makes a metal plate the top and laminates | stacks a metal plate and a resin layer alternately. For example, a five-layer structure in which the first metal plate 41, the resin layer 43, the second metal plate 42, the resin layer 43, and the first metal plate 41 are stacked in this order from the top may be used. In the base portion 40, an acrylic plate or the like may be employed instead of the metal plate.

  The impact sensor 19 is not necessarily disposed on the lower surface 40b of the base portion 40. For example, you may arrange | position in parts other than the lower surface 40b in the base part 40, the inside of the main-body part 14, or between the main-body part 14 and the base part 40. FIG.

  By the way, the liquid A agent and the B agent which are the two-component RTV rubber exemplified as the rubber material 13 are foamed and solidified in the mold 24, and the temporary backside cloth-like material 32M1 of the temporary composite layer 30M1 and the temporary composite layer 20M1. In the process of impregnating the provisional second layer portion 22M1, gas (hydrogen gas) is generated by a chemical reaction between the A agent and the B agent. Here, as shown in FIG. 6B, a manufacturing method in which the base portion 40 is previously bonded to the temporary composite layer 30M1 is set at the bottom of the mold 24, and the base portion 40 is inserted and molded. Consider the case of adopting. In this case, the generated gas can escape to the side through the provisional second layer portion 22M1 and the provisional back-side cloth material 32M1.

  However, since the first metal plate 41 of the base portion 40 does not allow the gas to pass therethrough, the generated gas does not escape sufficiently to the side, particularly in a region near the center of the first metal plate 41. As a result, there is a problem in that the central region of the first metal plate 41 tends to peel off from the temporary composite layer 30M1.

  Therefore, as will be described with reference to FIG. 7, it is preferable to provide a gas vent hole in the first metal plate 41 of the base portion 40 for releasing the gas generated in the molding process.

  FIG. 7A is a cross-sectional view schematically showing the configuration of the drum pad 10 that employs the base portion 40 having the gas vent holes. FIG.7 (b) is a figure which shows the shaping | molding method by the metal mold | die of the drum pad 10 shown to Fig.7 (a).

  As shown in FIG. 7A, in the base portion 40, the first metal plate 41 is formed with a number of gas vent holes 41a penetrating in the front and back direction (vertical direction). The vent hole 41a has a diameter of 1.6 mm. Further, the arrangement density of the gas vent holes 41 a is provided so as to be denser in a region farther from the outer edge 41 b of the first metal plate 41. That is, when the first metal plate 41 is a uniform flat plate, the gas vent holes 41a are formed so as to be closer to the center of gravity (center in the case of a circle). As a result, the efficiency of degassing from the degassing holes 41a is improved in the central region where gas is difficult to escape from the side.

  The size of the gas vent hole 41a may be determined in consideration of easiness of formation and the like as long as gas can pass therethrough and may be smaller than 1.6 mm. For example, in the case of forming by press working, the above 1.6 mm is appropriate, but is not limited thereto. Further, if the total area of the gas vent holes 41a is sufficient, there is not much problem with the arrangement density, so that the distance between them may be equal (for example, 40 mm). Regardless of the method of forming the gas vent hole 41a, for example, it may be drilled by machining with a drill.

  Molding is performed as follows. First, the upper surface (upper surface 40 a) of the first metal plate 41 provided with the gas vent holes 41 a is bonded to the lower surface of the temporary back-side cloth material 32 </ b> M <b> 1 via the adhesive 31. It is laid on the bottom of the mold 24 so that the temporary backside cloth material 32M1 is on the upper side, and the temporary composite layer 20M1 is placed on the ceiling side of the mold 24 so that the temporary second layer 22M1 is on the lower side. Install. Then, the rubber material 13 is cast between the temporary composite layer 20M1 and the temporary composite layer 20M1, and the main body portion 14 is formed by reaction.

  Of the hydrogen gas generated in the molding process, the gas that reaches the vicinity of the first metal plate 41 and the gas that is generated in the vicinity of the hydrogen gas pass through the vent hole 41a through the temporary back cloth material 32M1 and the adhesive 31, and Go out to the outside. Here, since the temporary backside cloth-like material 32M1 and the pressure-sensitive adhesive 31 have a minute gap through which gas can pass, there is no need to provide a structure for venting anew. Even after the provisional back side cloth-like material 32M1 is impregnated with the rubber material 13 to become the back side cloth-like material 32M2, if there is residual gas, it can be extracted through the vent hole 41a.

  Thereafter, the second metal plate 42 is attached to the first metal plate 41 via the resin layer 43 to form the base portion 40. Thereby, the molded product shown in FIG. 7A is completed.

  As described above, according to the configuration of FIG. 7A, the gas generated in the forming process prevents the first metal plate 41 and the back-side cloth material 32M2 from peeling off. As a result, the fixing strength between the main body portion 14 and the base portion 40 can be maintained high.

  By the way, in performing the molding, the base portion 40 in which the second metal plate 42 is bonded to the first metal plate 41 via the resin layer 43 may be laid on the bottom of the mold 24. In that case, the resin layer It is necessary to adopt a material that is resistant to heat and through which gas can pass. In such a case, the second metal plate 42 may be provided with a vent hole similar to the first metal plate 41.

  The provision of the vent holes 41a in the first metal plate 41 is also applicable to the “non-restraining type” having the two-layer structure described above and the “non-damping type” having only the first metal plate 41. Or it is applicable also to the 5 layer structure laminated | stacked in order of the 1st metal plate 41, the resin layer 43, the 2nd metal plate 42, the resin layer 43, and the 1st metal plate 41. FIG.

  Note that the gas discharged from the vent hole 41a is not limited to hydrogen gas. The degassing hole 41a is widely applicable to measures against degassing generated due to molding, and thus is useful in a production method in which gas is generated regardless of the type of rubber used and the molding method.

  12 resin material, 13 rubber material, 14 main body, 14b bottom surface (back surface), 20 front side cloth-like material, 20a surface, 20b back surface, 21 first layer portion, 22M2 second layer portion, 30M1 provisional composite layer, 30M2 back side composite Layer, 31 adhesive (adhesive layer), 32M1 provisional back cloth material, 32M2 back cloth material, 32a surface, 32b back surface, 40 base portion, first metal plate 41, 41a vent hole, 41b outer edge

Claims (9)

A main body made of rubber;
A back-side cloth-like material provided on the back surface which is the surface opposite to the side to be struck of the main body,
A base portion having at least a member formed with a plurality of holes penetrating in the front-back direction, the side of the member being fixed to the back surface of the back-side cloth-like material via a fixing layer made of an adhesive or an adhesive; Have
The drum pad, wherein the back side cloth-like material is impregnated with the rubber, and the main body is joined to the surface of the back side cloth-like material.   The drum pad according to claim 1, wherein the disposition density of the holes is higher at a position farther from the outer edge of the base portion.   A front-side cloth-like material having a surface that is a surface to be struck and a back surface opposite to the surface, and expansion and contraction that is thinner than the front-side cloth-like material and that can be heat-sealed to the front-side cloth-like material The melted resin material enters a region that includes the front surface and does not include the back surface of the front cloth material, and the resin material and the front cloth material are integrated with each other. A solidified first layer portion is formed, and the rubber is impregnated between the main body portion and the first layer portion in the entire remaining region other than the first layer portion of the front cloth material. The drum pad according to claim 1, wherein a second layer portion is formed, and the main body portion is joined to the back surface of the front cloth material. A drum pad manufacturing method comprising a main body portion made of rubber and a back-side cloth-like material provided on a back surface that is a surface opposite to the side to be struck of the main body portion,
An adhering step of adhering the member side of the base portion having at least a member formed with a plurality of holes penetrating in the front and back directions to the back surface of the back cloth material through an adhering layer made of an adhesive or an adhesive; ,
From the surface side of the backside cloth-like material with the base portion fixed to the back surface, a liquid resin material or heat-softened unvulcanized rubber as the rubber material is cast and reacted to react the main body portion. A drum pad manufacturing method comprising: a molding step of impregnating the rubber on the backside cloth-like material by molding and bringing the surface of the backside cloth-like material and the main body into a joined state. . A front-side cloth-like material having a surface that is a surface to be struck and a back surface opposite to the surface, and expansion and contraction that is thinner than the front-side cloth-like material and that can be heat-sealed to the front-side cloth-like material A drum pad manufacturing method comprising: a flexible resin material; a main body portion made of rubber; and a back-side cloth-like material provided on the back surface of the main body portion on the side opposite to the hit side. And
By heat-sealing the resin material to the surface of the front cloth material, the molten resin material enters a region that includes the front surface and does not include the back surface of the front cloth material. And a heat-sealing step of forming a first layer portion formed by solidifying the front-side cloth-like material integrally,
An adhering step of adhering the member side of the base portion having at least a member formed with a plurality of holes penetrating in the front and back directions to the back surface of the back cloth material through an adhering layer made of an adhesive or an adhesive; ,
Between the back surface of the front cloth material having the first layer portion formed in the region including the front surface and not including the back surface, and the surface of the back cloth material having the base portion fixed to the back surface. In addition, a liquid resin material or a heat-softened unvulcanized rubber, which is a material of the rubber, is cast and reacted to form the main body portion, and between the main body portion and the first layer portion. And forming the second layer portion impregnated with the rubber in the entire remaining region other than the first layer portion of the front cloth material, and bringing the back surface of the front cloth material and the main body portion into a bonded state. And a method of manufacturing a drum pad, comprising: a step of impregnating the backside cloth-like material with the rubber and bringing the surface of the backside cloth-like material into a bonded state.   The drum pad according to claim 1, wherein the rubber is foamed rubber.   The drum pad according to claim 1, wherein the rubber is a silicone rubber having a siloxane bond.   6. The method for manufacturing a drum pad according to claim 4, wherein the rubber is foamed rubber.   6. The method of manufacturing a drum pad according to claim 4, wherein the rubber is a silicone rubber having a siloxane bond.