JP6358929B2 - Electric friction tool - Google Patents

Description

  The present invention relates to an electric friction tool for changing the color of an image or handwriting drawn with thermochromic ink by applying frictional heat.

  2. Description of the Related Art Conventionally, thermochromic inks that are colorless and transparent when heated to a certain temperature (for example, 65 ° C. or more) are known. When the handwriting drawn with such thermochromic ink is rubbed by a friction tool described in, for example, cited document 1 (Japanese Patent Application Laid-Open No. 2013-116588), a temperature of a certain level or more is generated by frictional heat generated at that time. Because it is heated, it becomes colorless and transparent.

  However, when the handwriting drawn with the thermochromic ink is made colorless and transparent using the friction tool described in Cited Document 1, it is necessary to manually repeat the frictional operation by gripping the friction tool and making small strokes. This is a burden on the user.

  In order to solve such a problem, a friction body is attached to the tip of the rotating shaft of the motor, the friction body is rotated by rotating the motor, and the rotating friction body is drawn with thermochromic ink. There is known an electric friction tool that rubs the handwriting and makes the thermochromic ink at a certain temperature or higher to make it colorless and transparent. An example of such an electric friction tool is described in cited document 2 (Japanese Unexamined Patent Application Publication No. 2011-42151).

  The electric friction tool is convenient because it is not necessary to repeat the frictional operation manually, but the rotating frictional body may accidentally contact the skin, which may cause pain or burns. There is also. There is also a risk that the hair is caught in the rotation of the friction body. Furthermore, if a string-like foreign material that is not hair is involved, there is no danger to the user, but the friction tool itself may be damaged.

JP 2013-116588 A JP 2011-42151 A

  By surrounding the periphery of the friction body with a cylindrical cover and adjusting the rotational torque of the motor, the above problems can be avoided. Since the friction body of the electric friction tool does not wear, when one end of the cover is supported by the case of the electric friction tool via the spring, the Shore A hardness of the friction body in JIS K6253 and the biasing force by the spring The comfort (particularly, the required pressing force) determined by the load required to push the cover against the case against the case does not change even if the use period becomes longer.

  The present invention has been made based on such circumstances, and a cover surrounding the friction body of the electric friction tool is supported on the case of the electric friction tool via a spring, and the friction body is provided. By focusing on the balance between the Shore A hardness, the load required to push the cover, and the distance that the other end of the cover extends from the tip of the friction body, the above-mentioned problem can be solved. It is an object to provide an electric friction tool that is easy to use and avoids.

  Further, the present invention provides a distance for extending the tip of the friction body from the other end of the cover, and a maximum distance of a gap between the inner peripheral surface of the cover and the outer peripheral surface of the friction body at the other end of the cover. By focusing attention on the balance between the two, it is an object to provide an electric friction tool that avoids the above-mentioned problems.

  The present invention is an electric friction tool for changing the color of an image or handwriting drawn with thermochromic ink by applying frictional heat, and is attached to a motor for rotating a rotating shaft and a tip of the rotating shaft. The friction body, a case for supporting the motor, and a cylindrical cover that surrounds the periphery of the friction body and is supported on one end side of the case via an elastic body. A cylindrical sleeve part surrounding at least a part of the region on one end side of the cover is provided, and at least a part of the sleeve part in the circumferential direction of the inner peripheral surface of the sleeve part is provided in at least a part of the sleeve part in the axial direction. A contact portion is formed, and the cover is provided with a contacted portion that is in contact with the contact portion of the sleeve portion from one end side, and the contact portion and the contacted portion are provided. The bullet The rotational force of the motor is selected from the range of 0.10 N · cm to 0.90 N · cm, and the Shore A hardness of the friction body in JIS K6253 is 55 degrees. The load necessary to push the cover against the case against the urging force of the elastic body is selected from the range of 0.1N to 5.0N, and the other end of the cover Is an electric friction tool characterized by being aligned with the tip of the friction body or extending from the tip by a predetermined set distance selected from a range of 5.0 mm or less.

  According to the present invention, by surrounding the friction body with the cover and adjusting the rotational torque of the motor, it is possible to avoid entanglement of hair or string-like foreign matters, and the Shore A hardness of the friction body, By adjusting the balance between the load required to push the cover and the distance of extending the other end of the cover from the tip of the friction body within the above ranges, the service period can be increased. It is possible to provide an electric friction tool that can maintain the comfort of use even when it is long.

  Preferably, the abutted portion of the cover is formed as a flange portion slidably fitted on the inner peripheral surface of the sleeve portion, and is 1.0 mm or more in the axial direction of the cover. It has a length. In this case, since the cover moves in the sleeve portion while the inner peripheral surface of the sleeve portion and the outer peripheral surface of the flange portion slide, the cover can move stably without being inclined in the axial direction. .

  Preferably, a switch for supplying electric power to the motor only when pressed is provided in the case, and the switch is attached to the cover as the cover is pushed into the case. A pressing part for pressing is provided. In this case, since the motor is not driven unless the cover is pushed into the case, useless driving of the motor can be prevented, and battery consumption can be minimized.

  Alternatively, the present invention is an electric friction tool for changing the color of an image or handwriting drawn with thermochromic ink by applying frictional heat, and a motor for rotating a rotating shaft, and a tip of the rotating shaft A friction body attached to the motor, a case for supporting the motor, and a cylindrical cover that surrounds the periphery of the friction body and is supported at one end by the case. It is selected from the range of 10 N · cm to 0.90 N · cm, and the tip of the friction body extends a fixed set distance from the other end of the cover, and the fixed set distance is 0.5 mm. The maximum gap between the inner peripheral surface of the cover and the outer peripheral surface of the friction body at the other end of the cover is selected from the range of 0.03 mm to 1.0 mm. Has been It is a motorized friction member characterized by.

  According to the present invention, by adjusting the rotational torque of the motor within the above range, it is possible to avoid the possibility of causing a burn or the like when the rotating friction body accidentally contacts the skin, and the tip of the friction body. Between the other end of the cover and the maximum distance of the gap between the inner peripheral surface of the cover and the outer peripheral surface of the friction body at the other end of the cover. By adjusting within the range, it is possible to provide an electric friction tool capable of avoiding entrainment of hair or string-like foreign matters.

  In this case, the edge of the other end of the cover is formed as a side-shaped slope of the truncated cone, and at least a part of the tip region of the friction body is formed as a side-shaped slope of the truncated cone. The angle α formed by the inclined surface of the friction body in the cross section passing through the rotation axis of the friction body and the angle β formed by the inclined surface of the cover in the cross section satisfy the relationship of α ≧ β> 30 °. It is preferable. In this case, even if hair, string-like foreign matter, or the like is in contact with the tip region of the friction body, the hair, string-like foreign matter, etc. are smoothly moved to the outside of the cover due to the presence of the inclined surface.

  According to the present invention, the rotating friction body accidentally contacts the skin by surrounding the friction body of the electric friction tool with the cover and adjusting the rotational torque of the motor within the above range. In addition to avoiding the possibility of burns and the like, and entanglement of hair and string-like foreign matters, the Shore A hardness of the friction body, the load necessary to push in the cover, and the tip of the friction body Providing a friction tool that can maintain the comfort of use even when the period of use is extended by adjusting the balance of the three of the distance to extend the other end of the cover within the above ranges. it can.

  Alternatively, according to the present invention, by adjusting the rotational torque of the motor within the above range, it is possible to avoid the possibility of causing a burn or the like when the rotating friction body accidentally contacts the skin, and the friction body. The distance between the front end of the cover extending from the other end of the cover and the maximum distance of the gap between the inner peripheral surface of the cover and the outer peripheral surface of the friction body at the other end of the cover By adjusting within these ranges, it is possible to provide an electric friction tool capable of avoiding entrainment of hair or string-like foreign matters.

It is the schematic of the electric friction tool of the 1st Embodiment of this invention. 1A is a schematic longitudinal sectional view of an electric friction tool, and FIG. 1B is a schematic front view of the electric friction tool viewed from the left side of FIG. 1A. It is the schematic of the friction body of the electric friction tool of FIG. 2 (A) is a schematic front view of the friction body, FIG. 2 (B) is a schematic side view of the friction body viewed from the right side of FIG. 2 (A), and FIG. FIG. 2B is a schematic rear view of the friction body viewed from the right side of FIG. 2B, and FIG. 2D is a cross-sectional view taken along the line DD of FIG. It is the schematic of the cover of the electric friction tool of FIG. 3A is a schematic front view of the cover, FIG. 3B is a schematic side view of the cover viewed from the right side of FIG. 3A, and FIG. 3C is FIG. It is a schematic rear view of the cover seen from the right side of (B). It is a schematic longitudinal cross-sectional view of the electrically driven friction tool of the 2nd Embodiment of this invention. It is the schematic of the cover of the electric friction tool of FIG. 5A is a schematic front view of the cover, FIG. 5B is a schematic side view of the cover viewed from the right side of FIG. 5A, and FIG. 5C is FIG. It is a schematic rear view of the cover seen from the right side of (B). It is a schematic longitudinal cross-sectional view of the electrically driven friction tool of the 3rd Embodiment of this invention. It is a schematic enlarged view of the vicinity of the friction body and cover of the electric friction tool of FIG. It is the schematic of the friction body of the electric friction tool of FIG. 8A is a schematic front view of the friction body, FIG. 8B is a schematic side view of the friction body viewed from the right side of FIG. 8A, and FIG. It is a schematic rear view of the friction body seen from the right side of FIG. It is the schematic of the cover of the electric friction tool of FIG. 9A is a schematic front view of the cover, FIG. 9B is a schematic side view of the cover viewed from the right side of FIG. 9A, and FIG. 9C is FIG. It is a schematic rear view of the cover seen from the right side of (B).

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic view of an electric friction tool 100 according to a first embodiment of the present invention. 1A is a schematic longitudinal sectional view of the electric friction tool 100, and FIG. 1B is a schematic front view of the electric friction tool 100 viewed from the left of FIG. 1A. is there.

  As shown in FIG. 1A, an electric friction tool 100 includes a motor 10 that rotates a rotating shaft 11, a friction body 20 that is attached to the tip of the rotating shaft 11, and a case 30 that supports the motor 10. And a cylindrical cover 40 that surrounds the periphery of the friction body 20 and is supported on one end side (the right side in FIG. 1A) via a spring 50 as an elastic body.

  In the present embodiment, as shown in FIG. 1A, the motor 10 is housed and supported on the other end side in the case 30 (left side in FIG. 1A). A battery 70 is accommodated on one end side in the case 30. The battery 70 is connected to the motor 10 by a conductor 61 disposed via the switch 60, and supplies power to the motor 10 in accordance with the operation of the switch 60. In the present embodiment, the switch 60 allows (conducts) the power supply to the motor 10 by pressing against the case 30 and cuts off the power supply to the motor 10 by pressing again. Yes.

  The motor 10 of the present embodiment has a rotational torque of 0.35 N · cm. The rotational torque of the motor 10 is preferably 0.10 N · cm to 0.90 N · cm. By setting the rotational torque to 0.10 N · cm or more, when the tip region of the friction body 20 is pressed against the handwriting drawn with the thermochromic ink on the paper surface, the motor 10 The frictional force generated between the region and the paper surface can be overcome and the rotation of the friction body 20 can be continued. On the other hand, by setting the rotational torque to 0.90 N · cm or less, the risk of causing a burn or the like is avoided even if the rotating friction body 20 accidentally contacts the skin.

  More preferably, the rotational torque of the motor 10 is 0.15 N · cm to 0.70 N · cm. By setting the rotational torque to 0.15 N · cm or more, even if the front end region of the friction body 20 is more strongly pressed against the paper surface, the motor 10 generates a frictional force generated between the front end region of the friction body 20 and the paper surface. Thus, the rotation of the friction body 20 can be continued. In this case, the time required until the frictional heat is generated after the tip region of the friction body 20 is pressed against the paper surface is sufficiently short, and the handwriting drawn with the thermochromic ink can be made colorless and transparent comfortably. . On the other hand, by setting the rotational torque to 0.70 N · cm or less, when the front end region of the rotating friction body 20 is pressed against the paper surface and rubbed, the paper surface is prevented from being damaged or wrinkled. Can be done.

  Further, a cylindrical sleeve portion 31 having a length of 17 mm, an inner diameter of 14 mm, and an outer diameter of 17 mm is provided on the other end side of the case 30 so as to surround a part of the region on the one end side of the cover 40. The length of the case 30 excluding the sleeve portion 31 is 90 mm. Further, as shown in FIG. 1B, the case 30 of the present embodiment has a circular cross section with a diameter of 30 mm.

  FIG. 2 is a schematic view of the friction body 20 of the electric friction tool 100 of FIG. 2A is a schematic front view of the friction body 20, and FIG. 2B is a schematic side view of the friction body 20 viewed from the right side of FIG. 2A, and FIG. These are the schematic back views of the friction body 20 seen from the right side of FIG. 2 (B), and FIG.2 (D) is the DD sectional view taken on the line of FIG. 2 (B).

  As shown in FIG. 2, the friction body 20 attached to the tip of the rotating shaft 11 of the motor 10 is made of a cylindrical elastic material having a length of 18 mm, a diameter of 6 mm, and a Shore A hardness of 88 degrees. The end side is chamfered in a hemispherical shape. The Shore A hardness of the friction body 20 is preferably 55 degrees or more. In this case, wear of the tip region when the tip region of the rotating friction member 20 is pressed against the paper surface and rubbed is prevented, and the friction member 20 and the cover 40 are deformed by deformation of the friction member 20 during friction. Contact with the inner peripheral surface is prevented.

  Further, as shown in FIGS. 2B and 2D, a striped pattern is provided on the outer peripheral surface of the friction body 20 along the direction of the rotation axis. That is, as shown in FIGS. 2B and 2D, the friction body 20 of the present embodiment is striped on the side surface of the friction body 20 with a material having a color different from the material constituting the tip region. The pattern is formed. For example, the material constituting the tip region of the friction body 20 is yellow, and the material providing the striped pattern is red. Due to such a color arrangement, the side surface of the friction body 20 looks orange, which is an intermediate color between the two colors, during rotation. Furthermore, the material that provides the striped pattern in the present embodiment has a higher hardness than the material that forms the tip region of the friction body 20, and FIG. It spreads to the area as shown in

  Further, as shown in FIG. 2C, a hole 21 having a diameter of 2 mm and a depth of 10 mm is provided at the center of the surface (back surface) on one end side of the friction body 20. The rotary shaft 11 is press-fitted. As shown in FIG. 2D, the other end side of the hole 21 is formed in a region of a material that provides a striped pattern having a higher hardness than the material constituting the tip region of the friction body 20.

  Examples of the elastic material constituting the friction body 20 include an elastic resin (rubber, elastomer). Examples thereof include silicone resins, SBS resins (styrene-butadiene-styrene copolymers), SEBS resins (styrene-ethylene-butadiene-styrene copolymers), fluorine resins, chloroprene resins, nitrile resins, polyester resins, An ethylene propylene diene rubber (EPDM) etc. are mentioned.

  In the present embodiment, the friction body 20 is surrounded by the cover 40. An example of such a cover 40 is shown in FIG. FIG. 3 is a schematic view of the cover 40 of the electric friction tool 100 of FIG. 3A is a schematic front view of the cover 40, FIG. 3B is a schematic side view of the cover 40 viewed from the right side of FIG. 3A, and FIG. FIG. 4 is a schematic rear view of the cover 40 as viewed from the right side of FIG.

  As shown in FIG. 3, the cover 40 has a cylindrical shape with a length of 18 mm, an inner diameter of 7 mm, and an outer diameter of 8.5 mm, and a flange portion with an outer diameter of 13.5 mm and a length of 5 mm on the other end side. 41 is provided as a contacted part. The cover 40 of the present embodiment is made of a transparent resin, and at least the tip region of the friction body 20 in the cover 40 can be visually recognized from the outside.

  Returning to FIG. 1A, the flange portion 41 of the cover 40 is slidably fitted on the inner peripheral surface of the sleeve portion 31 of the case 30, and is supported by the case 30 via a spring 50. . In the present embodiment, the spring 50 is a coil spring, and is adjusted so that the load required to push in the cover 40 supported by the spring 50 is 1.0N.

  The load necessary for pushing the cover 40 is preferably 0.1N to 5.0N. Since the load necessary to push in the cover 40 is 0.1 N or more, the cover 40 is prevented from being moved undesirably, and the resistance characteristics of the spring 50 when the cover 40 is pushed into the case 30 are characterized. Is stable. On the other hand, since the load required to push in the cover 40 is 5.0 N or less, the cover 40 can be pushed into the case 30 smoothly, so that the user's fatigue can be suppressed and the user can be used comfortably. The load on the paper surface by the tip of the cover 40 is small, and it is difficult to damage the paper surface by the tip.

  Further, a throttle portion 32 as a contact portion is provided on the other end side of the sleeve portion 31, and the other end side of the flange portion 41 of the cover 40 is brought into contact with the throttle portion 32 from one end side. Yes. At this time, the spring 50 is compressed from its natural length. That is, a biasing force by the spring 50 acts between the other end side of the flange portion 41 and the throttle portion 32. In this state, as shown in FIG. 1A, the other end of the cover 40 extends from the tip of the friction body 20 by a fixed set distance d. In the present embodiment, the fixed set distance d is set. Is 0.5 mm.

  Next, the operation of the electric friction tool 100 of the present embodiment will be described.

  First, if necessary, the battery cover provided on the case 30 is removed, the battery 70 is loaded in the case 30 in a predetermined direction, and the battery cover is attached again. Next, when the switch 60 is pressed, the motor 10 is driven, and the friction body 20 attached to the rotating shaft 11 is rotated at a high speed. In this state, the case 30 is gripped, and the tip region of the friction body 20 is pressed against the handwriting drawn with the thermochromic ink on the paper surface. In the present embodiment, the other end of the cover 40 comes into contact with the paper surface before the front end region of the friction body 20, but the spring 50 is further compressed by the case 30 being further pressed against the paper surface, thereby covering the cover. 40 is pushed into the case 30 side, and the tip end region of the friction body 20 comes into contact with the paper surface. At this time, since the outer peripheral surface of the flange portion 41 slides on the inner peripheral surface of the sleeve portion 31, the cover 40 moves stably without being inclined in the axial direction. The state in which the front end region of the friction body 20 is in contact with the paper surface is maintained, so that frictional heat is generated between the front end region of the friction body 20 and the paper surface due to the rotation of the friction body 20 by the motor 10. To do. By this frictional heat, the image or handwriting drawn with the thermochromic ink becomes colorless and transparent. In the present embodiment, since the friction body 20 is surrounded by the cover 40, heat radiation to the outside is suppressed, and the thermochromic ink can be efficiently heated.

  After the desired frictional operation is completed, the case 30 is moved away from the paper surface, and the state where the tip region of the friction body 20 is in contact with the paper surface is released. Accordingly, the cover 40 is moved to the other end side by the biasing force of the spring 50 until the other end side of the flange portion 41 abuts on the throttle portion 32 of the case 30. Thereafter, when the switch 60 is pressed again, the motor 10 stops.

  According to the present embodiment as described above, the friction body 20 is surrounded by the cover 40 and the rotational torque of the motor 10 is adjusted within the above range, so that the rotating friction body 20 is erroneously changed. While avoiding the possibility of causing burns and the like when coming into contact with the skin, and the entrapment of hair and string-like foreign matters, the Shore A hardness of the friction body 20, the load necessary to push the cover 40, and the friction body By adjusting the balance of the distance between the other end of the cover 40 to extend the other end of the cover 40 within the above ranges, the electric type can maintain the comfort of use even when the service period is long. The friction tool 100 can be provided.

  Further, according to the present embodiment, the other end side of the flange portion 41 of the cover 40 is brought into contact with the throttle portion 32 of the sleeve portion 31 from one end side, and the other end side of the flange portion 41 and the throttle portion. Since the urging force of the spring 50 is acting between the spring 32 and the spring 50, the resistance force of the spring 50 when the cover 40 is pushed into the case 30 as compared with the case where the urging force is not applied to the spring 50 in advance. The characteristics are stable. Therefore, it is possible to provide the electric friction tool 100 that is more comfortable to use.

  Furthermore, in the present embodiment, since the flange portion 41 of the cover 40 has a length of 5.0 mm, the outer peripheral surface of the flange portion 41 moves while sliding on the inner peripheral surface of the sleeve portion 31. For this reason, the cover 40 can move stably without inclining in the axial direction.

  Next, FIG. 4 is a schematic longitudinal sectional view of an electric friction tool 200 according to the second embodiment of the present invention. FIG. 5 is a schematic view of the cover 240 of the electric friction tool 200 of FIG. 5A is a schematic front view of the cover 240, FIG. 5B is a schematic side view of the cover 240 viewed from the right side of FIG. 5A, and FIG. FIG. 6 is a schematic rear view of the cover 240 as viewed from the right side of FIG.

  As shown in FIG. 4, the electric friction tool 200 of the present embodiment is similar to the electric friction tool 100 of the first embodiment, and includes a motor 210 that rotates a rotation shaft 211 and a rotation shaft 211. The friction body 220 attached to the front end of the motor, the case 230 that supports the motor 210, and the periphery of the friction body 220 are surrounded by one end side (the right side in FIG. 4) via a spring 250 as an elastic body. And a cylindrical cover 240.

  As shown in FIGS. 5 (B) and 5 (C), the cover 240 of the electric friction tool 200 of the present embodiment has a length of 10 mm on the radially inner edge of the annular back surface, A prismatic pressing portion 242 having a width of 4 mm and a thickness of 1.5 mm is integrally formed.

  Referring back to FIG. 4, the conductor 281 connected to one electrode of the battery 270 is fixed to one end side of the pressing portion 242, and the pressing portion is pushed as the cover 240 is pushed into the case 230. 242 moves to one end side together with the conductor 281. In addition, after the conductor 282 connected to one terminal of the motor 210 extends toward the other end side (left side in FIG. 4) in parallel with the rotation shaft 211, the tip is bent toward the rotation shaft 211 side. ing. In the state where the cover 240 is not pushed into the case 230, the conductor 281 and the conductor 282 are not in contact, but in the state where the cover 240 is pushed into the case 230 by 0.5 mm or more, The conductor 281 is in contact with the tip of the conductor 282 in a pressed state (in a bent state). That is, the conductor 281 and the conductor 282 constitute a sub switch 280 of the electric friction tool 200.

  Further, in the present embodiment, a switch 260 is also provided on the side surface of the case 230 as in the case of the electric friction tool 100 of the first embodiment (see FIG. 4). Other configurations are substantially the same as those of the first embodiment.

  Next, the operation of the electric friction tool 200 of the present embodiment will be described.

  Similarly to the electric friction tool 100 of the first embodiment, if necessary, the battery cover provided on the case 230 is removed, the battery 270 is loaded in the case 230 in a predetermined direction, and again. A battery lid is attached. Next, the switch 260 is pressed. At this time, unlike the electric friction tool 100 of the first embodiment, the conductor 281 constituting the sub switch 280 and the tip of the conductor 282 are not in contact with each other, so electric power is not supplied to the motor 210, The motor 210 remains stopped.

  Next, the case 230 is gripped, and the tip region of the friction body 220 is pressed against the handwriting drawn with the thermochromic ink on the paper surface. Also in the present embodiment, the other end of the cover 240 abuts on the paper surface before the front end region of the friction body 220 as in the electric friction tool 100 of the first embodiment, but the case 230 is placed on the paper surface. By being further pressed against the spring, the spring 250 is further compressed and the cover 240 is pushed into the case 230 side. At this time, since the outer peripheral surface of the flange portion 241 slides on the inner peripheral surface of the sleeve portion 231, the cover 240 moves stably without being inclined in the axial direction. The front end region of the friction body 220 abuts on the paper surface, and the conductor 281 moves together with the pressing portion 242 of the cover 240 to contact the front end of the conductor 282. As a result, electric power is supplied to the motor 210, the motor 210 is driven, and the friction body 220 attached to the rotating shaft 211 rotates. The state in which the front end region of the friction body 220 is in contact with the paper surface is maintained, so that frictional heat is generated between the front end region of the friction body 220 and the paper surface due to the rotation of the friction body 220 by the motor 210. To do. Due to this frictional heat, the handwriting drawn with thermochromic ink becomes colorless and transparent.

  After the desired frictional operation is completed, the case 230 is moved away from the paper surface, and the state where the tip region of the friction body 220 is in contact with the paper surface is released. As a result, the cover 240 is moved to the other end side by the biasing force of the spring 250 until the other end side of the flange portion 241 contacts the throttle portion 232 of the case 230. At this time, the contact between the conductor 281 and the tip of the conductor 282 is released, and the driving of the motor 210 is stopped, that is, the rotation of the friction body 220 is stopped.

  Also according to the present embodiment as described above, the friction body 220 is surrounded by the cover 240 and the rotational torque of the motor is adjusted within the above range, so that the rotating friction body accidentally contacts the skin. In addition to avoiding the possibility of causing burns and the like, and the entrapment of hair and string-like foreign matters, the Shore A hardness of the friction body 220, the load necessary to push the cover 240, and the tip of the friction body 220 It is possible to provide an electric friction tool 200 that can maintain the comfort of use even when the period of use is extended by adjusting the balance of the three distances that extend the other end of the cover 240 more. it can.

  Further, according to the present embodiment, the other end side of the flange portion 241 of the cover 240 is brought into contact with the throttle portion 232 of the sleeve portion 231 from one end side, and the other end side of the flange portion 241 and the throttle portion. Since the urging force by the spring 250 is acting between the spring 232 and the 232, the resistance force of the spring 250 when the cover 240 is pushed into the case 230 as compared with the case where the urging force is not applied to the spring 50 in advance. The characteristics are stable. Therefore, it is possible to provide the electric friction tool 200 that is more comfortable to use.

  Further, in the present embodiment, since the flange portion 241 of the cover 240 has a length of 5.0 mm, the outer peripheral surface of the flange portion 241 moves while sliding on the inner peripheral surface of the sleeve portion 231. For this reason, the cover 240 can move stably without inclining in the axial direction.

  In addition, in the electric friction tool 200 according to the present embodiment, since the motor 210 is not driven unless the cover 240 is pushed in due to the presence of the sub switch 280, the unnecessary driving of the motor 210 can be prevented and the battery 270 is consumed. Can be minimized.

  Next, FIG. 6 is a schematic longitudinal sectional view of an electric friction tool 300 according to the third embodiment of the present invention. 7 is a schematic enlarged view of the vicinity of the friction body 320 and the cover 340 of the electric friction tool 300 of FIG. 6, and FIG. 8 is an outline of the friction body 320 of the electric friction tool 300 of FIG. 8A is a schematic front view of the friction body 320, and FIG. 8B is a schematic side view of the friction body 320 viewed from the right side of FIG. 8A. 8C is a schematic rear view of the friction body 320 viewed from the right side of FIG. 8B, and FIG. 9 is a schematic view of the cover 340 of the electric friction tool 300 of FIG. 9A is a schematic front view of the cover 340, FIG. 9B is a schematic side view of the cover 340 viewed from the right side of FIG. 9A, and FIG. It is a schematic rear view of the cover 340 seen from the right side of 9 (B).

  As shown in FIG. 6, the electric friction tool 300 of the present embodiment is similar to the electric friction tools 100 and 200 of the first and second embodiments, and the motor 310 that rotates the rotating shaft 311. And a friction body 320 attached to the tip of the rotating shaft 311, a case 330 that supports the motor 310, and a periphery of the friction body 320, and one end side of the case 330 via a spring 350 as an elastic body (see FIG. 6). And a cylindrical cover 340 supported on the right side.

  In the electric friction tool 300 of the present embodiment, as shown in FIG. 7, the tip of the friction body 320 extends from the other end of the cover 340 by a fixed set distance h. In the present embodiment, the fixed set distance h is 2.5 mm.

  Further, the maximum gap t between the inner peripheral surface of the cover 340 and the outer peripheral surface of the friction body 320 at the other end of the cover 340 is selected from a range of 0.03 mm to 1.0 mm. In the present embodiment, the maximum gap t is 0.3 mm. When the maximum gap t is smaller than 0.03 mm, the friction body 320 may come into contact with the inner peripheral surface of the cover 340 when the electric friction tool 300 is used depending on variations in parts processing or assembly. is there. On the other hand, when the maximum gap t is wider than 1.0 mm, it becomes easy to entrain hair or string-like foreign matters.

  In consideration of the bending of the rotating shaft 311 of the motor 310 and the thermal expansion of the friction body 320 when the friction body 320 is pressed against the paper surface during use, the maximum gap t is preferably 0.05 mm or more. When the body 320 comes into contact with the skin or the like, the maximum gap t is 0.5 mm or less in order to make it difficult to entangle with hair (generally having a thickness of about 0.05 mm to 0.15 mm). Preferably there is.

  Further, as shown in FIG. 8, the friction body 320 of the present embodiment is made of a cylindrical elastic material having a length of 20 mm, a diameter of 6 mm, and a Shore A hardness of 88 degrees. The part is chamfered so as to form a slope having a side shape of a truncated cone.

Furthermore, as shown in FIG. 9, the edge part of the other end of the cover 340 of this Embodiment is also formed as a side-shaped slope of a truncated cone. In the present embodiment, the angle α (the angle formed by the two straight lines l ₁ and l ₂ in FIG. 7) formed by the inclined surface of the friction body 320 in the cross section passing through the rotation axis of the friction body 320 and the cover 340 in the cross section. The angle β formed by the slope (the angle formed by the two straight lines m ₁ and m ₂ in FIG. 7) satisfies the relationship α ≧ β> 30 °.

  Other configurations are substantially the same as those of the electric friction tool 100 of the first embodiment.

  Next, the operation of the electric friction tool 300 of the present embodiment will be described.

  Similar to the electric friction tools 100 and 200 of the first and second embodiments, the battery lid provided on the case 330 is removed as necessary, and the battery 370 is placed in the case 330 in a predetermined direction. After loading, the battery lid is attached again. Next, when the switch 360 is pressed, the motor 310 is driven, and the friction body 320 attached to the rotating shaft 311 is rotated at a high speed. In this state, the case 330 is gripped, and the tip region of the friction body 320 is pressed against the handwriting drawn with the thermochromic ink on the paper surface. The state in which the front end region of the friction body 320 is in contact with the paper surface is maintained, so that frictional heat is generated between the front end region of the friction body 320 and the paper surface due to the rotation of the friction body 320 by the motor 310. To do. Due to this frictional heat, the handwriting drawn with thermochromic ink becomes colorless and transparent.

  In the electric friction tool 300 according to the present embodiment, the tip of the friction body 320 extends 2.5 mm from the other end of the cover 340 so that the rotating shaft of the friction body 320 is pressed perpendicularly to the paper surface. Even when pressed at a slight acute angle with respect to the paper surface, the friction body 320 can rub the image or handwriting drawn with the thermochromic ink. When the other end of the cover 340 is pressed against the paper surface, the spring 350 is further compressed and the cover 340 is pushed into the case 330 side.

  After the desired frictional operation is completed, the case 330 is moved away from the paper surface, and the state where the tip region of the friction body 320 is in contact with the paper surface is released. Thereafter, when the switch 360 is pressed again, the motor 310 stops.

  According to the present embodiment as described above, by adjusting the rotational torque of the motor within the above range, it is possible to avoid the possibility of causing a burn or the like when the rotating friction body accidentally contacts the skin. In addition, the distance by which the tip of the friction body 320 is extended from the other end of the cover 340, and the maximum distance of the gap between the inner peripheral surface of the cover 340 and the outer peripheral surface of the friction body 320 at the other end of the cover 340. By adjusting the balance between t and t within the above ranges, it is possible to provide the electric friction tool 300 that can avoid the entrapment of hair or string-like foreign matters.

  Further, the angle α formed by the inclined surface of the friction body 320 in the cross section passing through the rotation axis of the friction body 320 and the angle β formed by the inclined surface of the cover 340 in the cross section satisfy the relationship of α ≧ β> 30 °. . For this reason, even if hair or string-like foreign matter contacts the tip region of the friction body 320, the hair or string-like foreign matter or the like is smoothly moved to the outside of the cover 340 due to the presence of the inclined surface.

  In any of the above-described embodiments, the friction bodies 20, 220, 320 are attached to the rotating shafts 11, 211, 311 of the motors 10, 210, 310 via attachments (intermediate members). Also good.

  Further, in the present embodiment, red and yellow striped patterns are provided on the outer peripheral surfaces of the friction bodies 20, 220, and 320 so that it can be easily grasped that the friction bodies 20, 220, and 320 are rotating. However, for example, a combination of other colors such as red and white (exhibiting pink when rotated), red and blue (exhibiting purple when rotating) may be used. Furthermore, it is possible to grasp whether or not the friction bodies 20, 220, 320 are rotating by providing a polka dot pattern on the tip area of the friction body or printing characters such as “stopped”. May be. Thereby, when the electric friction tools 100, 200, 300 are not used, it can be easily confirmed that the friction bodies 20, 220, 320 are not rotating, and safety can be further improved.

DESCRIPTION OF SYMBOLS 10 Motor 11 Rotating shaft 20 Friction body 21 Hole 30 Case 31 Sleeve part 32 Restriction part 40 Cover 41 Flange part 50 Spring 60 Switch 61 Conductor 70 Battery 100 Electric friction tool 200 of 1st Embodiment 2nd implementation Motorized friction tool 210 Motor 211 Rotating shaft 220 Friction body 230 Case 231 Sleeve portion 232 Restriction portion 240 Cover 241 Flange portion 242 Pressing portion 250 Spring 260 Switch 270 Battery 280 Sub switch 281 Conductor 282 Conductor 300 Third embodiment Motorized friction tool 310 Motor 311 Rotating shaft 320 Friction body 321 Hole 330 Case 331 Sleeve portion 332 Throttle portion 340 Cover 341 Flange portion 350 Spring 360 Switch 370 Battery d Fixed set distance (from the tip of the friction body to the other of the cover Let the end extend Ku distance)
h Constant set distance (distance that the tip of the friction body extends from the other end of the cover)
t Maximum clearance α Angle formed by the slope of the friction body in the cross section passing through the rotational axis of the friction body β Angle formed by the slope of the cover in the cross section passing through the rotational axis of the friction body

Claims (5)

An electric friction tool for changing the color of an image or handwriting drawn with thermochromic ink by applying frictional heat,
A motor that rotates the rotating shaft;
A friction body attached to the tip of the rotating shaft;
A case for supporting the motor;
A cylindrical cover that surrounds the periphery of the friction body and is supported at one end side by an elastic body in the case;
With
The case is provided with a cylindrical sleeve portion surrounding at least a part of a region on one end side of the cover,
In at least a part of the sleeve part in the axial direction, a contact part is formed on at least a part of the inner peripheral surface of the sleeve part in the circumferential direction,
The cover is provided with a contacted portion that is in contact with the contact portion of the sleeve portion from one end side,
A biasing force by the elastic body acts between the contact portion and the contacted portion,
The rotational torque of the motor is selected from the range of 0.10 N · cm to 0.90 N · cm,
The Shore A hardness of the friction body in JIS K6253 is 55 degrees or more,
The load required to push the cover against the case against the urging force of the elastic body is selected from the range of 0.1N to 5.0N,
The other end of the cover is aligned with the tip of the friction body, or extends from the tip by a certain set distance selected from a range of 5.0 mm or less. Friction tool. The abutted portion of the cover is formed as a flange portion slidably fitted on the inner peripheral surface of the sleeve portion, and has a length of 1.0 mm or more in the axial direction of the cover. The electric friction tool according to claim 1, wherein the electric friction tool is provided. In the case, a switch for supplying electric power to the motor only at the time of pressing is provided,
The electric friction tool according to claim 1, wherein the cover is provided with a pressing portion that presses the switch when the cover is pushed into the case. An electric friction tool for changing the color of an image or handwriting drawn with thermochromic ink by applying frictional heat,
A motor that rotates the rotating shaft;
A friction body attached to the tip of the rotating shaft;
A case for supporting the motor;
A cylindrical cover that surrounds the periphery of the friction body and is supported at one end by the case;
With
The rotational torque of the motor is selected from the range of 0.10 N · cm to 0.90 N · cm,
The front end of the friction body extends a certain set distance from the other end of the cover,
The fixed set distance is selected from a range of 0.5 mm to 10.0 mm,
The maximum friction between the inner peripheral surface of the cover and the outer peripheral surface of the friction body at the other end of the cover is selected from the range of 0.03 mm to 1.0 mm. Ingredients. The edge of the other end of the cover is formed as a side-shaped slope of a truncated cone,
At least a portion of the tip region of the friction body is formed as a side-shaped slope of a truncated cone,
The angle α formed by the inclined surface of the friction body in the cross section passing through the rotation axis of the friction body and the angle β formed by the inclined surface of the cover in the cross section satisfy the relationship of α ≧ β> 30 °. The electric friction tool according to claim 4.

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