JP5929755B2 - Mechanical pencil - Google Patents

Description

The present invention relates to a mechanical pencil.
In particular, the present invention relates to a mechanical pencil lead feeding structure in which a certain amount of lead feeding with the wear of the lead can be performed with a writing pressure (hereinafter referred to as writing pressure) or higher writing pressure.

  Conventionally, there has been known a mechanical pencil in which a user intentionally protrudes a lead by a lead feeding operation (rear end knocking operation) according to wear of the lead accompanying writing. However, in order to perform the feeding operation for aligning the core during writing, it is necessary to temporarily change the mechanical pencil, which causes troublesome operation.

  Therefore, in Patent Document 1, with the wear of the lead due to writing, the tip pipe functioning as a lead guide is operated so as to gradually recede into the tip, so that the protruding amount of the writing lead from the tip pipe is constant. A pipe-sliding mechanical pencil that can be maintained within the range has been proposed.

JP 2009-233921 A

  The basic structure of the mechanical pencil disclosed in Patent Document 1 is configured such that the lead can be extended forward by releasing and gripping the lead by the back and forth movement of the chuck disposed in the shaft cylinder. And a rotational drive mechanism that rotationally drives the rotor in one direction in response to a retreat operation by the writing pressure received by the core and a forward operation by release of the writing pressure, and is provided at the front end portion of the shaft cylinder. A pipe support member that supports a pipe-shaped core guide is received, and receives a rotational drive operation of the rotor that constitutes the rotational drive mechanism, and is supported by the pipe support member. A retraction drive mechanism for retreating the core guide gradually toward the shaft cylinder is provided.

  However, in the basic structure, it is possible to draw out a certain amount of lead by gradually retreating the lead guide, but if the addition and release of writing pressure is repeated more than necessary, the lead will be written. The problem that the lead is drawn out longer than the wear amount of the lead and when the retraction distance set by the lead guide is reached, the user changes the mechanical pencil and performs the lead feeding operation (rear end knocking operation). There was a need.

The present invention has been made in view of the problems, the shaft tube or previous member, the chuck unit to prevent retraction of the core, in a mechanical pencil the sliding unit is arranged to have a function of holding the core, the sliding unit The sliding unit is moved back and forth by the rotation of a rotor having a sawtooth-like continuous groove formed on the outer periphery and having a projection that engages with the serrated continuous groove, and the distance of the back-and-forth movement of the sliding unit The first gist is that the core is extended by intermittently applying and releasing the writing pressure a plurality of times, and the chuck unit for preventing the core from retreating is held in the shaft cylinder or the tip member. In the mechanical pencil in which the sliding unit having the function to be arranged is arranged, the sliding unit in which the sawtooth-like continuous grooves are formed on the outer periphery is formed into a cylindrical member having a protrusion that engages with the sawtooth-like continuous grooves. Then, the second gist is to rotate and move back and forth, and the distance of the slide unit to move back and forth is intermittently different and the core is extended by applying and releasing the writing pressure a plurality of times. Alternatively, in the mechanical pencil in which the chuck unit for preventing the retreat of the lead and the slide unit having a function of holding the lead are arranged in the tip member, the shaft is arranged in the rear end surface of the slide unit and the tip member. A plurality of serrated cam peaks are formed radially from the center, and a cylindrical member having a protrusion that engages with the serrated cam peaks is rotated and moved back and forth by the back and forth movement of the sliding unit, and the cylindrical member The chuck unit that prevents the retraction of the lead in the shaft cylinder or the tip member is a third gist that the distance of the longitudinal movement is intermittently different, and the lead is drawn out by adding and releasing the writing pressure a plurality of times. Holding the wick In a mechanical pencil in which a sliding unit having a function is arranged, the sliding unit, a sleeve in which the sliding unit is rotatably inserted, and the sleeve are integrated in the shaft tube or the tip member. A core feed unit in which the arranged slider presser is arranged integrally in the axial direction, a rotor, and a rear cam cylinder are sequentially arranged, and the front of the rear cam in the front member and the rear cam cylinder In addition, a plurality of serrated cam peaks are formed radially from the center of each axis, and the rotor having serrated cam peaks engaging with the serrated cam peaks on the front end surface and the rear end surface is provided at the front and rear of the chuck unit. In addition to rotating and back-and-forth movement by the movement, the distance of the back-and-forth movement of the lead feeding unit that rotates with the rotor is intermittently varied, and the lead is fed out by adding and releasing the writing pressure a plurality of times. In the mechanical pencil in which the chuck unit for preventing the retraction of the core and the core feeding unit having a function of holding the core are arranged in the shaft tube or the tip member, the core feeding unit is a slider. A sleeve, a slider presser, and a core holding member. The slider, the sleeve, and the slider presser are integrated into the shaft tube or the tip member, and the core holding member is press-fitted inside. A fixed core feed unit arranged to slide forward and backward, and a rotor and a rear cam cylinder are sequentially arranged, and each shaft is arranged in the front member and on the front face of the rear cam cylinder. A plurality of serrated cam peaks are formed radially from the center, and the rotor having serrated cam peaks engaging with the serrated cam peaks on the front end face and the rear end face is rotated and moved back and forth by the longitudinal movement of the chuck unit. When it moves To, made different intermittently the distance of the back-and-forth movement of the core feed unit rotating with the rotor, by the release and the addition of multiple writing pressure, it is an fifth aspect that feed the core .

The present invention, in the barrel or above member, a chuck unit for blocking the retraction of the core, in a mechanical pencil the sliding unit is arranged to have a function of holding the core, serrated on the outer periphery of the sliding unit The sliding unit is moved back and forth by the rotation of the rotor having a groove formed and a projection engaging with the sawtooth-shaped continuous groove, and the distance of the sliding unit is changed intermittently. sliding with the plurality of additional and release of the writing pressure, that feed the cores to the first aspect, the barrel or above member, a chuck unit for blocking the retraction of the core, the function of holding the core In the mechanical pencil in which the unit is arranged, the sliding unit having a serrated continuous groove formed on the outer periphery is rotated and moved back and forth with respect to a cylindrical member having a protrusion that engages with the serrated continuous groove. And the distance of the back and forth movement of the sliding unit is intermittently different, and the second gist is that the lead is drawn out by applying and releasing the writing pressure a plurality of times. A mechanical pencil in which a chuck unit for preventing retraction and a sliding unit having a function of holding a core are arranged, and a plurality of saw teeth radially from the axial center in the rear end surface of the sliding unit and the tip member A cylindrical member having a projection that engages with the serrated cam crest is rotated and moved back and forth by the back and forth movement of the sliding unit, and the distance of the back and forth movement of the cylindrical member is intermittent. Unlike the above, the third gist is that the lead is drawn out by applying and releasing the writing pressure a plurality of times, and the chuck unit for preventing the lead from retreating in the shaft tube or the tip member and the function of holding the lead. Sliding In a mechanical pencil in which a knit is arranged, the sliding unit, a sleeve in which the sliding unit is rotatably inserted in the shaft cylinder or the tip member, and a slider arranged integrally with the sleeve A core feeding unit in which the presser is integrally arranged in the axial direction, a rotor, and a rear cam cylinder are sequentially arranged, and the center of each axis is arranged in the front member and on the front face of the rear cam of the rear cam cylinder. A plurality of serrated cam peaks are radially formed from the rotor, and the rotor having serrated cam peaks engaging with the serrated cam peaks on the front end surface and the rear end surface is rotated and moved back and forth by the back and forth movement of the chuck unit. In addition, the fourth aspect is that the distance between the longitudinal movements of the lead feeding unit that rotates with the rotor is intermittently varied, and the lead is drawn out by adding and releasing the writing pressure a plurality of times. or Is a mechanical pencil in which a chuck unit for preventing retraction of the lead and a lead feeding unit having a function of holding the lead are arranged in the tip member. The lead feeding unit includes a slider, a sleeve, and a slider. It comprises a presser and a core holding member, and the slider, the sleeve and the slider presser are integrated in the shaft tube or the tip member, and the core holding member is press-fitted and fixed inside, A core feeding unit, a rotor, and a rear cam cylinder are sequentially arranged, and a plurality of saw teeth are radially formed from the center of each axis on the front member and the front surface of the rear cam of the rear cam cylinder. The rotor having a serrated cam peak engaging with the serrated cam peak at the front end face and the rear end face is rotated and moved back and forth by the back and forth movement of the chuck unit, and the rotor Accompanying Made different intermittently the distance of the back-and-forth movement of the core feed unit for rotating, by the release and the addition of multiple writing pressure, so that feeding the core and the fifth aspect, the feeding of the excessive core prevention Te At the same time, it is not necessary for the user to change the mechanical pencil and perform the lead-out operation (rear end knocking operation), thereby improving the writing efficiency.

The longitudinal cross-sectional view which shows the structure of 1st Example of this invention. 1 is a partially enlarged longitudinal sectional view showing the configuration of a first embodiment of the present invention. The AA sectional view of the 1st example of the present invention. The assembly drawing of the sliding unit of 1st Example of this invention. (A) The front view of a sliding unit. (B) External appearance perspective view of a sliding unit. Detailed view of the rotor of the first embodiment of the present invention. The operation | movement figure of 1st Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. The operation | movement figure of 1st Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. The operation | movement figure of 1st Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. The operation | movement figure of 1st Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. The operation | movement figure of 1st Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. FIG. 5 is a detailed perspective view of a modified example of the sliding unit according to the first embodiment of the present invention. The longitudinal cross-sectional view which shows the structure of 2nd Example of this invention. The detailed perspective view of the sliding unit of 2nd Example of this invention. The detail drawing of the cylindrical member of 2nd Example of this invention. The operation | movement figure of 2nd Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. The operation | movement figure of 2nd Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. The operation | movement figure of 2nd Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. The operation | movement figure of 2nd Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. The operation | movement figure of 2nd Example of this invention. (A) The principal part longitudinal cross-sectional view. (B) The external appearance front view which shows a slider and a rotor. The longitudinal cross-sectional view which shows the structure of 3rd Example of this invention. The partial expanded longitudinal cross-sectional view which shows the structure of 3rd Example of this invention. The detailed cross-sectional perspective view of the tip member and slider of 3rd Example of this invention. The operation | movement figure of 3rd Example of this invention. The operation | movement detailed sectional perspective view of 3rd Example of this invention. The operation | movement figure of 3rd Example of this invention. The operation | movement detailed sectional perspective view of 3rd Example of this invention. The operation | movement figure of 3rd Example of this invention. The operation | movement detailed sectional perspective view of 3rd Example of this invention. The operation | movement figure of 3rd Example of this invention. The operation | movement detailed sectional perspective view of 3rd Example of this invention. The operation | movement figure of 3rd Example of this invention. The operation | movement detailed sectional perspective view of 3rd Example of this invention. The detailed cross-sectional perspective view of the tip member and slider of 3rd Example of this invention. The longitudinal cross-sectional view which shows the structure of 4th Example of this invention. The partial expanded longitudinal cross-sectional view which shows the structure of 4th Example of this invention. The partial assembly perspective view which shows the structure of 4th Example of this invention. The operation | movement figure of 4th Example of this invention. The operation | movement detailed cross-sectional perspective view of 4th Example of this invention. The operation | movement figure of 4th Example of this invention. The operation | movement detailed cross-sectional perspective view of 4th Example of this invention. The operation | movement figure of 4th Example of this invention. The operation | movement detailed cross-sectional perspective view of 4th Example of this invention. The operation | movement detailed cross-sectional perspective view of 4th Example of this invention. The operation | movement detailed cross-sectional perspective view of 4th Example of this invention. The longitudinal cross-sectional view which shows the structure of 5th Example of this invention. The partial expanded longitudinal cross-sectional view which shows the structure of 5th Example of this invention. The partial assembly perspective view which shows the structure of 5th Example of this invention. The operation | movement figure of 5th Example of this invention. The operation | movement detailed sectional perspective view of 5th Example of this invention. The operation | movement figure of 5th Example of this invention. The operation | movement detailed sectional perspective view of 5th Example of this invention. The operation | movement figure of 5th Example of this invention. The operation | movement detailed sectional perspective view of 5th Example of this invention. The operation | movement detailed sectional perspective view of 5th Example of this invention. The operation | movement detailed sectional perspective view of 5th Example of this invention. The longitudinal cross-sectional view which shows the structure of 6th Example of this invention. The partial expanded longitudinal cross-sectional view which shows the structure of 6th Example of this invention. The principal part cross-sectional perspective view which shows the structure of 6th Example of this invention.

  A basic structure of a mechanical pencil having a core feeding structure according to the first and second embodiments of the present invention will be described. The shaft cylinder or the tip member receives a sliding unit in which a core holding member is fixed, a retreat operation by the writing pressure received by the core and a forward operation by releasing the writing pressure, and performs the retreat operation and the forward operation. And a rotation drive mechanism that converts the rotation into one direction.

  In this rotary drive mechanism, a protrusion provided on the rotary drive mechanism engages with a sawtooth groove provided on a side surface of the sliding unit, and the difference in the axial length of the sawtooth groove is utilized. Thus, the lead can be intermittently drawn out by restricting the amount of axial movement of the sliding unit. This intermittent lead-out operation realized continuous writing without the user having to change the mechanical pencil during writing.

  The lead-out structure of the mechanical pencil of the present invention will be described based on the first embodiment. FIG. 1 is a longitudinal sectional view showing a configuration of a first embodiment of the present invention, and FIG. 2 is a partially enlarged longitudinal sectional view.

  A front member 105 is fixed in front of the outer shaft cylinder 101 via a joint member 102. Inside the tip member 105, a slide body 113 in which a core holding member 119 is press-fitted and fixed and a core protection tube 121 is fixed at the tip, and a slide member 122 is press-fitted and fixed in the rear end of the slide body 113. The moving unit is arranged to move back and forth.

  A rotor 133 is located on the outer periphery of the sliding unit, and the rotor 133 is arranged to freely rotate inside the tip member 105. A resilient member 135 is in contact with the rear end of the sliding unit, and biases the sliding unit forward. A flanged cylinder 136 is disposed behind the sliding unit, and a flanged cylinder 138 is press-fitted and fixed in front of the flanged cylinder 136. And the chuck | zipper 141 is arrange | positioned in the state biased ahead by the elastic member 145 in the inside of the said hooked cylinder 136 and the hooked cylinder 138. FIG.

  An inclined cylindrical body 139 is disposed on the outer periphery in front of the chuck 141. A spherical ball 144 is disposed between the inner surface of the inclined cylindrical body 139 and a hemispherical concave portion 142 formed in front of the chuck 141. A chuck unit including the hooked cylinder 136 and the chuck 141 is disposed in the outer shaft cylinder 101 so as to be movable back and forth, and is always urged forward by a resilient member 147.

  A cylinder 148 is press-fitted and fixed behind the chuck unit, and a core tank 149 is press-fitted and fixed behind the cylinder 148. A cylindrical body 152 is press-fitted and fixed behind the core tank 149.

  The above is the configuration of the present embodiment. The present embodiment is characterized by the operation of the sliding unit and the rotor 133.

Furthermore, each member which comprises each unit is explained in full detail.
The joint member 102 is a cylindrical body having screw portions 103 and 104 in which screw grooves are formed in a front portion and a rear portion. The outer shaft cylinder 101 is screwed and fixed to the screw portion 104 (rear of the joint member 102), and the tip member 105 is screwed and fixed to the screw portion 103 (front of the joint member 102).

  The tip member 105 has a through hole 106 and stepped portions 107, 108, 109, 110 formed therein. As shown in FIG. 3, the step portion 108 has a circular shape with a flat portion 111 in part. A screw part 112 is formed behind the step part 110 and is screwed and fixed to the screw part 103 of the joint member 102. Further, the sliding unit is housed inside the tip member 105 and is arranged so as to slide back and forth in the axial direction with respect to the tip member 105, but is restricted by the flat portion 111 from being non-rotatable. ing.

  As described above, the sliding unit includes the sliding body 113, the core holding member 119, the core protection tube 121, and the sliding member 122. The core holding member 119 that is press-fitted and fixed to the inner step portion 114 of the sliding body 113 has a through hole 120 in the axial direction, and has a conical shape with a flat tip at the front and a cylindrical shape at the rear. The material used for the core holding member 119 may be an elastic resin, and specific examples thereof include nitrile butadiene rubber, silicone rubber, and fluorine rubber.

  Further, the core protection tube 121 press-fitted and fixed in the through hole 115 of the sliding body 113 is arranged for the purpose of making it easy to distinguish the protection of the fed core and the presence of the core (improvement of visibility). The sliding body 113 may be formed integrally. The material used for the core protection tube 121 is preferably a metal in order to protect the core (addition of a function for preventing core breakage). Specifically, iron and its alloy, copper and its alloy, etc. are mentioned.

  A step portion 116 is formed at the rear portion of the sliding body 113, and the front portion of the sliding member 122 is press-fitted and fixed. In addition, serrated grooves 117, 129 (131), and 130 are formed in the rear part of the sliding body 113 and the intermediate part of the sliding member 122 (see FIGS. 4A and 4B).

  The groove 117 formed in the rear portion of the sliding body 113 has a shape extending in the radial direction, and a plurality of grooves 117 having the same shape are formed in the circumferential direction. In the present embodiment, 24 grooves 117 are formed in the circumferential direction. On the other hand, the groove 129 (131) and the groove 130 formed in the intermediate portion of the sliding member 122 also have a shape extending in the radial direction, and a plurality of grooves 129 (131) are formed in the circumferential direction. The shape is different from the groove 117.

  Specifically, the grooves 129 (131) and the grooves 130 having different depths (lengths in the axial direction) are regularly arranged in the circumferential direction. More specifically, after seven grooves 129 (131), which are grooves having a short length in the axial direction (hereinafter referred to as shallow grooves), are continuously arranged in the circumferential direction, the length is long in the axial direction. One groove 130 which is a long groove (hereinafter referred to as a deep groove) is arranged.

  Seven of the shallow grooves 129 and one of the deep grooves 130 are defined as one block. In this embodiment, three blocks (a total of 24 shallow grooves and deep grooves) are regularly arranged. The serrated grooves regularly formed on the sliding body 113 and the sliding member 122 are arranged as serrated grooves with the apexes 118 and 132 being the opposite apexes shifted by a half pitch. .

  In addition, the sliding member 122 has a through hole 123 in the axial direction inside, and the outer peripheral portion has a thin convex shape at the front, and the step portions 124 and 125 whose diameter gradually increases toward the rear. 126, 127, and 128 are formed. The tip of the stepped portion 124 prevents the lead holding member 119 from coming out backward, and the stepped portion 125 is press-fitted and fixed to the stepped portion 116 of the front sliding body 113.

  A rotor 133 is located on the outer periphery of the sliding unit (the outer periphery of the sliding body 113 and the sliding member 122). On the inner peripheral side of the rotor 133, as shown in FIG. 5, three projections 134 projecting inward are formed at intervals of 120 °. The protrusion 134 can be brought into contact with any one of the serrated grooves (grooves 117, 129 (131), 130) formed in the sliding unit.

  Further, the front end of the resilient member 135 abuts on the stepped portion 128 of the sliding member 122 to urge the sliding member 122 forward. The urging force to the front of the elastic member 135 may be more than the force that pulls the core 146 gripped by the core holding member 119 from the chuck 141. Specifically, since the force with which the core 146 is pulled out from the chuck 141 is about 0.15 N, an urging force of 0.20 to 0.30 N or more is sufficient in consideration of attenuation due to resistance such as friction.

As described above, the chuck unit includes the flanged cylinder 136, the flanged cylinder 138, the inclined cylinder 139, the chuck 141, the ball 144, and the resilient member 145.

  The flanged cylinder 136 is a cylinder, and a flange 137 is press-fitted and fixed to the front portion thereof. In addition, a hooked cylinder 138 is detachably locked in front of the hooked cylinder 136. An inclined cylindrical body 139 is locked inside the flanged cylindrical body 138 in a non-detachable manner.

  On the inner surface of the inclined cylindrical body 139, an inclined surface 140 whose diameter increases toward the front is formed. A chuck 141 is disposed inside the inclined cylindrical body 139 so as to be movable back and forth. A hemispherical concave portion 142 is formed on the front outer peripheral surface of the chuck 141, and a concave core gripping gripping a core on the front inner surface. A portion 143 is formed. A ball 144 is interposed between the concave portion 142 and the inclined surface 140 of the inclined cylindrical body 139.

  Further, a resilient member 145 that urges the chuck 141 rearward is disposed inside the flanged cylinder 136. The elastic member 145 urges the chuck 141 rearward so that the chuck 141 is acted in the closing direction via the ball 144 in contact with the inclined surface 140 of the inclined cylindrical body 139, and the core 146 is gripped. Yes. That is, a ball chuck mechanism that allows the lead to move forward but prevents its backward movement by a wedge action.

  In this embodiment, the lead 146 requires a force of 0.15 N or more to move forward and 0.80 N or more to move backward. Incidentally, the urging force of the elastic member 145 to the rear is about 0.30N. Further, in this embodiment, the chuck 141 is configured by mutually opposing chuck pieces having the same shape divided into two.

  The inclined cylindrical body 139 and the chuck 141 constituting the chuck unit are made of a metal excellent in strength and durability, for example, copper or an alloy thereof, iron or an alloy thereof, aluminum, or the like because the ball 144 is in contact with the recess 142. Its alloys, zinc and its alloys are desirable, but relatively hard synthetic resins such as acrylonitrile, polycarbonate, polyacetal, etc., and those synthetic resins filled with inorganic powder, glass fiber, carbon fiber, etc. May be. Further, the chuck unit is urged forward by a resilient member 147 that contacts the rear of the flange 137 of the flanged cylinder 136. In this embodiment, the forward biasing force of the elastic member 147 is about 1.0N.

  A cylinder 148 is press-fitted and fixed behind the barbed cylinder 136. A lead tank 149 is fixed to the rear of the cylindrical body 148 so as not to be detached. A flange 150 is formed behind the core tank 149, and a resilient member 151 is compressed between the flange 150 and the outer shaft cylinder 101. The core tank 149 is urged backward by the elastic member 151.

  In addition, a cylindrical body 152 whose front diameter is smaller than the rear diameter is detachably locked to the rear end of the core tank 149. An eraser 153 is detachably locked to the inner side of the rear enlarged diameter portion of the cylindrical body 152, and a knock member 154 is detachably attached to the outer side of the rear enlarged diameter portion so as to cover the eraser 153. Locked.

  Next, the operation of intermittently extending the lead in the first embodiment of the present invention will be described. 6 to 10 are operation diagrams for intermittently extending the lead. The operation of intermittently extending the lead will be described together with the relationship between the sawtooth groove formed in the sliding unit and the protrusion 134 formed on the rotor 133.

  FIG. 6A shows a state in which the core 146 protrudes from the tip of the core protection tube 121. The protrusion 134 in this state is located in a shallow groove 129 formed in the sliding member 122 (see FIG. 6B).

  Next, when the tip of the lead 146 protruding from the tip of the lead protection tube 121 is brought into contact with the paper surface 155 for writing, a backward force (writing pressure) is applied to the lead 146 (state in which writing pressure is applied) ). This backward force (writing pressure) is transmitted from the core 146 to the chuck 141, and the chuck 141 attempts to move backward. However, the chuck 141 is firmly closed by the wedge action of the inclined surface 140 with which the ball 144 abutting in the semicircular recess 142 on the front outer peripheral surface of the chuck 141 comes into contact, and the core 146 is firmly held so as not to be retracted. . That is, the retraction of the core 146 is prevented by the wedge action.

  Further, when the user increases the writing pressure applied to the paper surface 155 and the writing pressure exceeds the force for biasing the chuck unit of the elastic member 147 forward, the elastic member 147 cannot resist the writing pressure and the chuck unit is fall back. By the retraction of the chuck unit, the core 146 gripped by the chuck 141 is apparently retracted, and the core holding member 119 that grips the core 146 is also retracted. By this retreat, the sliding unit containing the core holding member 119 also retreats (see FIG. 7A).

  In this state, the protrusion 134 moves from a position where it comes into contact with the groove 129 (shallow groove) to a position where it comes into contact with the groove 117 formed in the sliding body 113. As the protrusion 134 moves, the rotor 133 rotates. In the present embodiment, when viewed from the front of the core 146, only the rotor 133 is rotated clockwise (see FIG. 7B). Although one of the protrusions 134 of the rotor 133 functions, it is desirable to provide two or more if possible in order to prevent the rotor 133 from being twisted by the rearward biasing force and increasing the frictional force. In this embodiment, three protrusions 134 are provided.

  Next, FIG. 8 shows a state where writing is finished and the writing pressure is released. When the writing pressure is released, the chuck unit moves forward while holding the lead 146 by the forward biasing force of the elastic member 147. As the chuck unit advances, the sliding unit including the lead holding member 119 that grips the lead 146 also moves forward by the forward biasing force of the resilient member 135 in front of the chuck unit (see FIG. 8A).

  The protrusion 134 in this state moves from the position of the groove 117 to the deep groove 130 formed in the sliding member 122. In other words, compared to the state before the writing pressure was applied (state of FIG. 6), it moved from the shallow groove 129 to the deep groove 130 which is the next adjacent groove (see FIG. 8B).

  As the protrusion 134 moves, the rotor 133 rotates. In FIG. 8B, the protrusion 134 is in contact with the deep groove 130 of the sliding member 122. When the protrusion 134 abuts on the deep groove 130 of the sliding member 122, the sliding unit moves forward by a difference L between the length (depth) of the shallow groove 129 and the deep groove 130 from the state shown in FIG. Moving.

  As the sliding unit advances, the lead holding member 119 also moves forward while holding the lead 146 in the sliding unit, but the lead holding force of the lead holding member 119 is larger than the force with which the lead is pulled out from the chuck 141, and Since the urging force of the elastic member 135 forward is larger than the force of pulling out the lead from the chuck 141, the lead 146 is pulled forward (see FIG. 8A).

  Here, the lead 146 is pulled forward by the advancement of the sliding unit, but the sliding unit and the lead 146 move relatively, so the distance from the front end of the lead 146 to the front end of the lead protection tube 121 does not change. At this time, the lead 146 is not extended.

  Further, when writing is continued, as shown in FIG. 9A, the tip of the core 146 comes into contact with the paper surface 155 again, and a backward force (writing pressure) acts on the core 146. This backward force (writing pressure) is transmitted from the core 146 to the chuck 141, and the chuck 141 tries to move backward, but the ball 144 interposed in the hemispherical recess 142 on the front outer peripheral surface of the chuck 141, Due to the wedge action of the inclined surface 140 with which the ball 144 abuts, the chuck 141 is firmly closed, and the core 146 is more firmly gripped. That is, the operation is the same as in FIG.

  In this state, the protrusion 134 moves from the position of the deep groove 130 to the groove 117 formed in the sliding body 113 and the sliding unit retracts, and the length (depth) of the shallow groove 129 and the deep groove 130 is reduced. The core 146 protrudes by the difference L (see FIG. 9B).

  Next, FIG. 10 shows a state in which the writing is finished and the writing pressure is released. When the writing pressure is released, the chuck unit moves forward while holding the lead 146 by the forward biasing force of the elastic member 145. Along with the advancement of the chuck unit, the sliding body 113 including the lead holding member 119 that is positioned in front of the chuck unit and grips the lead 146 also advances by receiving the forward biasing force of the elastic member 135. In this state, the protrusion 134 moves from the position of the groove 117 to the shallow groove 131 formed in the sliding member 122 (see FIG. 10B). With this operation, the feeding operation of the lead 146 is completed.

  As shown in FIG. 4, the feeding frequency of the core 146 is determined by the number of deep grooves 130 in the serrated groove formed in the sliding body 113 and the sliding member 122, and the feeding length per one time is shallow. It is determined by the difference L between the distance between the groove and the deep groove.

  The actual mechanical pencil lead consumption varies depending on the hardness and paper quality of the writing lead, the language used, etc., but the number L of the deep grooves and the distance L between the shallow grooves and the deep grooves depends on the use situation. May be set as appropriate. In the present embodiment, since the deep grooves are regularly arranged at a ratio of one shallow groove to seven shallow grooves, the lead 146 is intermittently drawn out by applying and releasing the writing pressure eight times. It becomes operation.

  In the first embodiment, the slide body 113 and the slide member 122 are composed of two parts. However, as shown in FIG. 157 may be formed by cutting. In this case, by configuring the sliding body 156 with one component, there is no need to align the groove positions of the two front and rear components, thereby improving the assemblability and contributing to cost reduction.

FIG. 12 is a longitudinal sectional view showing the configuration of the second embodiment of the present invention.
A front member 205 is fixed to the front of the outer cylinder 201 via a joint member 202. Inside the tip member 205, a core holding member 217 is press-fitted and fixed, and a sliding body 212 having a core protection tube 219 fixed to the tip and a sliding body 220 press-fitted to the rear end of the sliding body 212 are fixed. The unit is arranged so that it can move back and forth and rotate freely.

  A cylindrical member 231 is positioned on the outer periphery of the sliding unit, and the cylindrical member 231 has a circular cross section having a flat portion 233 on a part of the outer peripheral surface as shown in FIG. In addition, a flat portion that engages with the flat portion 233 of the cylindrical member 231 is formed inside the tip member 205, and is press-fitted and fixed so that the rotation of the cylindrical member 231 with respect to the front member 205 is restricted. Has been.

  A resilient member 234 is disposed between the rear end of the sliding unit and the joint member 202 in a compressed state, and biases the sliding unit forward. A flanged cylinder 235 is disposed behind the sliding unit, and the flanged cylinder 236 is press-fitted and fixed in front of the flanged cylinder 235. The chuck 239 is disposed inside the flanged cylinder 235 and the flanged cylinder 236 in a state of being biased forward by the elastic member 242. An inclined cylindrical body 237 is disposed on the outer periphery in front of the chuck 239, and a spherical ball 241 is disposed in a hemispherical recess 240 formed in front of the chuck 239.

  A chuck unit including the flanged cylinder 235, the flanged cylinder 236, the chuck 239, and the like is disposed so as to be movable back and forth in the outer shaft cylinder 201 and is always urged forward by the elastic member 244.

  The above is the configuration of this embodiment. In this embodiment, the sliding unit is arranged so as to move back and forth inside the tip member 205 and be freely rotatable, and a cylindrical member 231 having a protrusion 232 is placed inside the tip member 205. It is different from the first embodiment in that it is fixed so that it cannot rotate.

  Furthermore, each member which comprises each unit is explained in full detail. The joint member 202 is a cylindrical body having screw portions 203 and 204 in which screw grooves are formed in a front portion and a rear portion. The outer shaft cylinder 201 is screwed and fixed to the screw portion 204 (rear of the joint member 202), and the tip member 205 is screwed and fixed to the screw portion 203 (front of the joint member 202).

  The tip member 205 has a through hole 206 inside and step portions 207, 208, 209, and 210 formed on the outer surface. A screw portion 211 is formed behind the step portion 210 and is screwed and fixed to the screw portion 203 of the joint member 202. The sliding member is housed inside the tip member 205, and is arranged so as to slide back and forth in the axial direction with respect to the tip member 205 and to rotate.

  As described above, the sliding unit includes the sliding body 212, the core holding member 217, the core protection tube 219, and the sliding body 220. The core holding member 217 that is press-fitted and fixed to the inner step portion 213 of the sliding body 212 has a through hole 218 in the axial direction, and has a conical shape with a flat tip at the front and a cylindrical shape at the rear. The material used for the core holding member 217 may be any resin having elasticity, and specific examples include nitrile butadiene rubber, silicone rubber, and fluorine rubber.

  Further, the core protection tube 219 that is press-fitted and fixed in the through hole 214 of the sliding body 212 is arranged for the purpose of making it easy to distinguish the protection of the fed core and the presence of the core (improvement of visibility). Alternatively, it may be formed integrally with the sliding body 212. The material used for the core protection tube 219 is preferably a metal for the purpose of protecting the core (adding the function of preventing core breakage). Specifically, iron and its alloy, copper and its alloy, etc. are mentioned.

  A step portion 215 is formed at the rear portion of the sliding body 212, and the sliding body 220 is press-fitted and fixed. In addition, sawtooth-shaped grooves 216, 227 (229), and 228 are formed in the rear portion of the sliding body 212 and the intermediate portion of the sliding body 220 (FIG. 14).

  The groove 216 formed in the rear part of the sliding body 212 has a shape extending in the radial direction, and a plurality of grooves 216 having the same shape are formed in the circumferential direction. In the present embodiment, 24 grooves 216 are formed in the circumferential direction. On the other hand, the groove 227 (229) and the groove 228 formed in the intermediate portion of the sliding body 220 also have a shape extending in the radial direction and are formed in the circumferential direction, but are formed in the sliding body 212. The shape is different from the groove 216. Specifically, the grooves 227 (229) and the grooves 228 having different axial lengths are regularly arranged.

  More specifically, after seven grooves 227 (229), which are grooves having a short length (depth) in the axial direction (hereinafter referred to as shallow grooves), are arranged in the circumferential direction, they are long in the axial direction. One groove 228 which is a groove having a long depth (depth) (hereinafter referred to as a deep groove) is disposed. Seven shallow grooves 227 and 229 and one deep groove 228 are used as one block, and in this embodiment, three blocks (a total of 24 shallow grooves and deep grooves) are regularly arranged. The serrated grooves regularly formed on the sliding body 212 and the sliding body 220 are arranged as serrated grooves with the apexes 246 and 230, which are opposite apexes, shifted by a half pitch.

  The sliding body 220 has a through-hole 221 in the axial direction, and has four step portions 222, 223, 224, 225, and 226 formed on the outer peripheral portion with a narrow convex shape at the front. The tip of the front step portion 222 prevents the lead holding member 217 from coming out backward, and the step portion 223 is fixed to the step portion 215 of the front sliding body 212.

  A cylindrical member 231 is located on the outer periphery of the sliding unit (the outer periphery of the sliding body 212 and the sliding body 220). On the inner peripheral side of the cylindrical member 231, as shown in FIG. 14, three projections 232 projecting inward are formed at intervals of 120 °. The protrusion 232 is engaged with serrated grooves (grooves 216, 227 (229), 228) formed in the sliding unit.

  Further, the front end of the elastic member 234 abuts on the step portion 226 of the sliding body 220, and the elastic member 234 biases the sliding body 220 forward.

  As described above, the chuck unit includes the flanged cylinder 235, the flanged cylinder 236, the inclined cylinder 237, the chuck 239, the ball 241 and the elastic member 242.

  A flanged cylinder 236 is press-fitted and fixed in front of the flanged cylinder 235, and a chuck 239 is urged forward by a resilient member 242 inside the flanged cylinder 235 and the flanged cylinder 236. It is arranged in the state. An inclined cylindrical body 237 is disposed on the outer periphery in front of the chuck 239, and a spherical ball 241 is disposed in a hemispherical recess 240 formed in front of the chuck 239. The chuck unit is disposed so as to be movable back and forth in the outer shaft cylinder 201 and is always urged forward by the resilient member 244.

  Next, the operation of intermittently extending the lead in the second embodiment of the present invention will be described. 15 to 19 are operation diagrams for intermittently extending the lead. The operation of intermittently extending the lead will be described together with the relationship between the sawtooth groove formed in the sliding unit and the protrusion 232 formed in the cylindrical member 231.

  FIG. 15A shows a state where the core 243 protrudes from the tip of the core protection tube 219. The protrusion 232 in this state is located in a groove 227 (shallow groove) formed in the sliding body 220 (see FIG. 15B).

  Next, when the tip of the core 243 protruding from the tip of the core protection tube 219 is brought into contact with the paper surface 245 for writing, a backward force (writing pressure) is applied to the core 243 (the writing pressure is applied). State).

  This backward force (writing pressure) is transmitted from the core 243 to the chuck 239, and the chuck 239 attempts to retreat. However, the chuck 239 is firmly closed by the wedge action of the inclined surface 238 with which the ball 241 interposed in the semicircular concave portion 240 on the front outer peripheral surface of the chuck 239 comes into contact, and the core 243 is firmly held so as not to be retracted. . That is, the retraction of the core 243 is prevented by the wedge action.

  Further, when the user increases the writing pressure applied to the paper surface 245 and the writing pressure exceeds the force urging the chuck unit of the elastic member 244 forward, the elastic member 244 is compressed by the writing pressure, The chuck unit moves backward. By the retraction of the chuck unit, the core 243 gripped by the chuck 239 is also apparently retracted, and the core holding member 217 that grips the core 243 is also retracted. By this retreat, the sliding unit containing the core holding member 217 also retreats (see FIG. 16A).

  The protrusion 232 in this state moves from a position where it contacts the shallow groove 227 to a groove 216 formed in the sliding body 212. Along with the movement of the protrusion 232, the sliding unit is rotated. In the present embodiment, when viewed from the front of the core 243, only the sliding unit receives a clockwise rotating action and rotates clockwise (see FIG. 16B).

  Although one protrusion 232 of the cylindrical member 231 functions, it is desirable to provide two or more if possible, in order to prevent the cylindrical member 231 from being twisted by the rearward biasing force and increasing the frictional force. In this embodiment, there are three protrusions 232.

  Next, FIG. 17 shows a state in which writing is completed and the writing pressure is released. When the writing pressure is released, the chuck unit moves forward while holding the core 243 by the forward biasing force of the elastic member 244. Along with the advancement of the chuck unit, the sliding unit including the lead holding member 217 that holds the lead 243 is also moved forward by the biasing force of the resilient member 234 in front of the chuck unit (see FIG. 17A).

  The protrusion 232 in this state moves from the position of the groove 216 to the deep groove 228 formed in the sliding body 220. That is, compared to before the writing pressure is applied (the state shown in FIG. 15), it moves from the shallow groove 227 to the deep groove 228 which is the next adjacent groove (see FIG. 17B). Along with the movement of the protrusion 232, the sliding unit is rotated.

  In FIG. 17B, the protrusion 232 is in contact with the deep groove 228 of the sliding body 220. When the protrusion 232 comes into contact with the deep groove 228 of the sliding body 220, the sliding unit moves forward by a difference L in the length (depth) of the shallow groove 227 and the deep groove 228 from the state of FIG. 15 before the writing pressure is applied. To do.

  As the slide unit advances, the lead holding member 217 also moves forward while holding the lead 243 in the slide unit, but the lead holding force of the lead holding member 217 is larger than the force for pulling the lead from the chuck 239, and Since the urging force of the elastic member 234 to the front is larger than the force to pull out the wick from the chuck 239, the wick 243 is pulled forward.

  The lead 243 is pulled forward by the advance of the sliding unit, but the sliding unit and the lead 243 move relatively, so the distance from the front end of the lead 243 to the front end of the lead protection tube 219 does not change. At this time, the lead 243 is not extended.

  Further, the difference from the first embodiment is that the core 243 held by the core holding member 217 rotates with the rotation of the sliding unit. By rotating the wick 243, it is possible to prevent the wick from being lost by writing, and an almost constant writing line width is always obtained.

  Furthermore, when writing is continued, as shown in FIG. 18A, the tip of the core 243 comes into contact with the paper surface 245 again, and a backward force (writing pressure) acts on the core 243. This backward force (writing pressure) is transmitted from the core 243 to the chuck 239, and the chuck 239 tries to move backward, but the ball 241 interposed in the hemispherical recess 240 on the front outer peripheral surface of the chuck 239, The chuck 239 is firmly closed by the wedge action with the inclined surface 238 with which the ball 241 abuts, and the core 243 is gripped more firmly. That is, the operation is the same as in FIG.

  In this state, the protrusion 232 moves from the position of the deep groove 228 to the groove 216 formed in the sliding body 212 and the sliding unit moves backward, and the length (depth) of the shallow groove 227 and the deep groove 228 is set. The core 243 protrudes by the difference L (see FIG. 18B).

  Next, FIG. 19 shows a state in which writing is completed and the writing pressure is released. When the writing pressure is released, the chuck unit moves forward while holding the lead 243 by the forward biasing force of the elastic member 242. Along with the advancement of the chuck unit, the sliding unit 212 including the core holding member 217 for gripping the core 243 is also moved forward by the forward biasing force of the elastic member 234 in front of the chuck unit.

  The protrusion 232 in this state moves from the position of the groove 216 to the shallow groove 229 formed in the sliding body 220 (see FIG. 19B). By this operation, the feeding operation of the core 243 is completed.

  As shown in FIG. 17, the feeding frequency of the core 243 is determined by the number of grooves 228 (deep grooves) in the serrated grooves formed on the sliding body 212 and the sliding body 220, and the feeding length per one time. Is determined by the difference L between the distance between the shallow groove and the deep groove.

  The actual mechanical pencil lead consumption varies depending on the hardness and paper quality of the writing lead, the language used, etc., but the number L of the deep grooves and the difference L between the distances of the shallow grooves depends on the use situation. What is necessary is just to set suitably. In this embodiment, since the deep grooves are regularly arranged at a ratio of one shallow groove to seven shallow grooves, the lead 243 is intermittently fed out once by applying and releasing the writing pressure eight times. It becomes operation.

  Next, the basic structure of a mechanical pencil having a lead-out structure according to the third embodiment of the present invention will be described. In the shaft tube or the tip member, the reciprocating operation and the advancing operation are received by the slider having the core holding member fixed therein, the retreating operation by the writing pressure received by the lead and the advancing operation by releasing the writing pressure. And a rotator that converts to one-way rotation.

  In this rotor, when the writing pressure is released, a protrusion provided on the front surface of the rotor is engaged with a serrated cam provided on a step portion in the tip member. By utilizing the difference in the axial length of the cams in the shape of the shape, the amount of movement of the rotor in the axial direction is regulated, so that the lead can be intermittently drawn out. This intermittent lead feeding operation realized continuous writing without the user changing the mechanical pencil during writing.

  Based on the third embodiment, the mechanical pencil lead-out structure of the present invention will be described. FIG. 20 is a longitudinal sectional view showing the configuration of the third embodiment of the present invention, and FIG. 21 is a partially enlarged longitudinal sectional view.

  A front member 302 is fixed in front of the outer shaft cylinder 301 by using a means such as screwing. Inside the tip member 302, a hole 303 having a plurality of step portions penetrates in the axial direction. A slider 316 is inserted in front of the tip member 302 and is slidable back and forth in a state of protruding outward from a slider guide hole 304 opened at the front end of the tip member 302.

  A rotation regulating hole 305 having a diameter larger than that of the slider guide hole 304 is provided behind the slider guide hole 304. A plurality of ribs 306 projecting inward are provided on the inner surface of the rotation restricting hole 305 and inserted into a plurality of guide grooves 317 provided on the outer peripheral surface of the slider 316. . At this time, the width of the rib 306 is slightly narrower than the width of the guide groove 317, and the slider 316 is slidable in the front-rear direction and is disposed with its rotation restricted.

  In this embodiment, the rib 306 and the guide groove 317 are provided at three locations, respectively, but the purpose is to stably and freely move the slider 316 back and forth and to restrict the rotation. The location is not limited.

  Further, a core holding member 324 is press-fitted and fixed in front of the inside of the slider 316 and constitutes a sliding unit 325 together with the slider 316. Further, a rotor guide hole 307 having a diameter larger than that of the rotation restricting hole 305 is provided behind the rotation restricting hole 305, and a rotor 326 is inserted therein and is rotatably arranged. A serrated fixed cam 308 is provided at the front step portion of the rotor guide hole 307.

  A plurality of protrusions 327 projecting forward are provided at equal angular intervals on the front surface of the rotor 326, and the front end surface 328 of the protrusion 327 is in contact with the fixed cam 308. The front end surface 328 of the protrusion 327 is inclined according to the angle of the inclined surface 309 of the fixed cam 308 and is in contact with each other on the surface.

  In the present embodiment, the protrusions 327 are provided at three positions, but the purpose is to stably bring the rotor 326 into contact with the fixed cam 308 and is not limited to three positions.

  Further, as shown in FIG. 23, the rotor 326 is composed of two disk-shaped members arranged at the front and rear positions, and two thin portions provided between the two disk-shaped members and extending in the front-rear direction. Has been. These two thin portions are elastic portions formed in semicircular arc shapes facing each other on either one of the opposing surfaces of the disk-shaped member. When a compressive force in the front-rear direction is applied to the rotor 326, the thin portion is crushed, thereby narrowing the interval between the two disk-shaped members disposed in the front-rear direction so that the rotor 326 can expand and contract in the front-rear direction.

  A chuck lid cylinder 331 is disposed behind the rotor 326. That is, the rotor 326 is disposed between the fixed cam 308 and the chuck lid cylinder 331 with its intermediate portion slightly compressed in the front-rear direction. Further, an inclined cylinder 335 is inserted into the inside of the chuck lid cylinder 331 from the rear, and is arranged to be slidable back and forth.

  A rear end knock spring 341 is disposed between the rear end surface 332 of the chuck lid cylinder 331 and the rear flange 336 of the inclined cylinder body 335, and always urges the chuck lid cylinder 331 forward. Yes.

  Further, a chuck 342 is inserted into the inclined cylinder 335. A hemispherical recess 343 is provided in front of the chuck 342, and a spherical ball 344 is disposed between the inclined cylindrical body 335 and the inclined inner surface 337.

  Further, a flanged cylinder 345 is fitted into the inclined cylinder 335 from behind and is press-fitted and fixed. A chuck spring 348 is disposed between the front inner step 346 of the flanged cylinder 345 and the rear step 347 of the chuck 342, and always urges the chuck 342 backward.

  A chuck unit 350 including the chuck lid cylinder 331 and the chuck 342 is disposed in the outer shaft cylinder 301 so as to be movable back and forth, and is always urged forward by a writing pressure receiving spring 352.

  The rotor 326 is extrapolated in front of the chuck unit 350, and the rotor 326 is always urged forward by the elastic force of the writing pressure receiving spring 352. That is, the front end surface 328 of the protrusion 327 of the rotor 326 is in contact with the inclined surface 309 of the fixed cam 308 by the urging force of the writing pressure receiving spring 352.

  A tip spring 353 is disposed between the front end surface 351 of the chuck unit 350 and the internal step portion 317 of the slider 316, and always urges the slider 316 forward.

  A core receiver 354 is inserted behind the chuck unit, and the core receiver 354 is arranged to be slidable in the front-rear direction. A lead tank 355 is press-fitted into the rear of the lead receiver 354 and is fixed integrally with the lead receiver 354.

  Further, a step portion 356 is provided at the rear portion of the lead tank 355, and a rear end knock auxiliary spring 358 is disposed between the step portion 356 and the intermediate step portion 357 provided at the intermediate portion of the outer shaft cylinder 301, and the lead tank. 355 is always biased backward.

  Further, a knock unit 359 is press fitted into the rear of the lead tank 355, and is fixed integrally with the lead tank. The knock unit 359 includes a stepped cylindrical eraser receiving cylinder 360, an eraser 361 inserted in the eraser receiving cylinder, and a knock member 362 fitted on the eraser receiving cylinder 360.

  A small-diameter portion 363 is provided behind the outer shaft cylinder 301, and the clip 364 is fixed by externally press-fitting a cylindrical attachment portion 365 into the small-diameter portion 363.

  The above is the configuration of the present embodiment. The present embodiment is characterized by the operations of the slider 316 and the rotor 326.

Further, each member will be described in detail.
The sliding unit 325 includes the slider 316 and the core holding member 324 as described above. The core holding member 324 has a through hole 329 in the axial direction, the front is a conical shape with a flat tip, and the rear is a cylindrical shape.

  A core 330 is inserted into the through hole 329. The core holding member 324 is press-fitted and fixed to the inner step 318 of the slider 316 and compressed inward, so that the through hole 329 is slightly reduced in diameter.

  The material used for the core holding member 324 may be a resin having elasticity, and specific examples include nitrile butadiene rubber, silicone rubber, and fluorine rubber. That is, a desired core holding force is generated by the reduced diameter of the through hole 329 by press-fitting and the elastic material.

  A sawtooth moving cam 319 is formed on the rear end surface of the slider 316. The moving cam 319 has a plurality of moving cam peaks 320 formed radially from the axial center of the slider 316. Further, in the plurality of formed moving cam peaks 320, moving cam peaks 321 having deep valleys are formed at equal angular intervals by the same number as the protrusions 327 of the rotor 326.

  In this embodiment, 30 moving cam peaks 320 and three moving cam peaks 321 are formed. After ten moving cam peaks 320 are arranged, one moving cam peak 321 is arranged. Ten moving cam peaks 320 and one moving cam peak 321 constitute one block, and three blocks are regularly arranged in a circle.

  The inclination angle of the moving cam peak 320 and the moving cam peak 321 is the same, and the cam surface of the moving cam peak 321 is twice the cam surface of the moving cam peak 320. Therefore, the cam depth of the moving cam peak 321 is twice the cam depth of the moving cam peak 320.

  The sawtooth fixed cam 308 of the tip member 302 is formed with a plurality of fixed cam peaks 310 radially from the axial center of the tip member 302, as with the movable cam 319. Further, fixed cam peaks 311 having deep valleys are formed at equal angular intervals in the plurality of fixed cam peaks 310 formed by the same number as the protrusions 327 of the rotor 326.

  In the present embodiment, 30 fixed cam peaks 310 and three fixed cam peaks 311 are formed, and after 10 fixed cam peaks 310 are arranged, one fixed cam peak 311 is arranged. Ten fixed cam peaks 310 and one fixed cam deep mountain 311 constitute one block, and three blocks are regularly arranged circumferentially.

  As described above, the slider 316 is slidable in the front-rear direction with respect to the tip member 302 and is disposed with its rotation restricted. Further, the vertex 322 of the moving cam 319 and the vertex 312 of the fixed cam 308 are arranged in a relationship shifted by a half pitch.

  As described above, the chuck unit 350 includes the chuck lid cylinder 331, the inclined cylinder 335, the rear end knock spring 341, the chuck 342, the ball 344, the flanged cylinder 345, and the chuck spring 348.

  The inclined cylinder 335 is inserted into the inside of the chuck lid cylinder 331 from the rear, and the locking hole 338 opened on the outer periphery of the inclined cylinder 335 is directed inward to the rear part of the chuck lid cylinder 331. The protruding locking protrusion 333 is inserted.

  The rear end knock spring 341 is disposed between the rear end surface 332 of the chuck lid cylinder 331 and the rear flange 336 of the inclined cylinder 335 so as to cover the outer periphery 339 of the inclined cylinder 335, and the chuck The lid cylinder 331 is always urged forward. As a result, the locking surface 334 of the locking projection 333 and the front end surface 340 of the locking hole 338 come into contact with each other, and the chuck lid cylinder 331 is locked to the inclined cylinder 335.

  The inner diameter of the chuck lid cylinder 331 is slightly larger than the outer diameter of the outer periphery 339 of the inclined cylinder 335, and slides in the front-rear direction against the urging force of the rear end knock spring 341. It is free to move.

  Further, the chuck 342 is inserted into the inclined cylinder 335. The semispherical concave portion 343 is provided in front of the chuck 342, and a spherical ball 344 is disposed between the inclined cylindrical body 335 and the inclined inner surface 337. Further, the flanged cylinder 345 is fitted into the inclined cylinder 335 from behind and is press-fitted and fixed.

  The chuck spring 348 is disposed between the front inner step 346 of the flanged cylinder 345 and the rear step 347 of the chuck 342 so as to cover the outer periphery 349 of the chuck 342, and the chuck 342. Is always energized backward.

  In other words, the chuck spring 348 urges the chuck 342 backward, thereby causing the chuck 342 to act in the closing direction via the ball 344 in contact with the inclined inner surface 337, thereby gripping the core 330. . In other words, the ball 330 is a ball chuck mechanism that allows the core 330 to move forward but prevents the backward movement by a wedge action. In the present embodiment, the chuck 342 is configured by mutually opposing chuck pieces having the same shape divided into two.

  The materials of the inclined cylinder 335 and the chuck 342 constituting the chuck unit are in contact with the ball 344, so that a metal excellent in strength and durability, for example, copper and its alloy, iron and its alloy, aluminum and its alloy, Zinc and its alloys are desirable, but relatively hard synthetic resins such as acrylonitrile, polycarbonate, polyacetal, etc., and those synthetic resins filled with inorganic powder, glass fiber, carbon fiber, etc. .

  Further, the order of each of the biasing force of each spring, the core holding force of the core holding member 324, and the core gripping force of the ball chuck mechanism will be described in detail. The following magnitude relationship is required in order from the weakest.

  That is, the gripping force when the lead of the ball chuck mechanism is advanced is weaker than the biasing force of the tip spring 353, the biasing force of the tip spring is weaker than the lead holding force of the lead holding member, and the lead holding force is The force obtained by adding the urging force of the knock auxiliary spring 358 and the urging force of the tip spring 353 is weaker than the urging force of the pen pressure receiving spring 352, and further, the urging force of the pen pressure receiving spring 352 is applied. The urging force is weaker than the urging force of the rear end knock spring 341, and the urging force of the rear end knock spring 341 is set to be weaker than the gripping force when the core of the ball chuck mechanism is retracted.

  More specifically, in this embodiment, the gripping force at the time of core advance of the ball chuck mechanism is 0.059 N or more and 0.29 N or less, and the urging force of the tip spring 353 is 0.44 N or more and 0.54 N or less. Further, the lead holding force of the lead holding member is 0.69 N or more and 0.88 N or less, and the urging force of the rear end knock auxiliary spring 358 + the urging force of the tip spring 353 is 1.52 N or more and 1.85 N or less, Further, the urging force of the pen pressure receiving spring 352 is 1.94 N or more and 2.37 N or less, and the urging force of the rear end knock spring 341 is 3.48 N or more and 4.26 N or less, and the ball chuck mechanism is gripped when the core is retracted. The force is configured to be 7.84N or more.

  Next, the operation of intermittently extending the lead in the third embodiment of the present invention will be described. 23 to 32 are operation diagrams for intermittently feeding the lead. Regarding the operation of intermittently extending the lead, together with the relationship between the moving cam 319 formed on the sliding unit 325, the fixed cam 308 formed on the tip member 302, and the protrusion 327 formed on the rotor 326. explain.

  FIG. 23 and FIG. 24 show a state in which the core 330 protrudes from the tip of the slider 316. In this state, the protrusion 327 is located on a fixed cam peak 308 formed on the tip member 302.

  Next, when the tip of the core 330 protruding from the tip of the slider 316 is brought into contact with the paper surface 366 for writing, a backward force (writing pressure) is applied to the core 330 (writing pressure). With added). This backward force (writing pressure) is transmitted from the core 330 to the chuck 342, and the chuck 342 attempts to move backward.

  At this time, since the ball 344 interposed in the hemispherical concave portion 343 on the front outer peripheral surface of the chuck 342 is in contact with the inclined inner surface 337, a wedge action occurs, and the chuck 342 is firmly closed, As a result, the core 330 is firmly held so that it cannot be retracted. That is, the retraction of the core 330 is prevented by the wedge action.

  Further, when the user increases the writing pressure applied to the paper surface 366 and the writing pressure exceeds the forward biasing force of the writing pressure receiving spring 352, the writing pressure receiving spring 352 is bent and the chuck unit 350 is retracted. . By retreating the chuck unit 350, the core 330 gripped by the chuck 342 is also apparently retracted, and the core holding member 324 that holds the core 330 is also retracted.

  By this retraction, the sliding unit 325 including the core holding member 324 is also retracted. At this time, the protrusion 327 of the rotor 326 is pushed up from the fixed cam crest 308 of the tip member 302 by the moving cam crest 320 of the slider 316, and slides on the inclined surface to the moving cam crest 320. Change. By this transfer, the rotor 326 rotates by a half pitch.

  Further, at the time of the transfer, the thin portion of the rotor 326 extends due to its own elastic restoring force. Therefore, the protrusion 327 is urged forward, and the protrusion 327 is in contact with the moving cam crest 320 (see FIGS. 25 and 26).

  Next, FIG. 27 and FIG. 28 show a state where the writing is finished and the writing pressure is released. When the writing pressure is released, the chuck unit 350 moves forward while holding the lead 330 by the forward biasing force of the writing pressure receiving spring 352. As the chuck unit 350 advances, the lead holding member 324 that holds the lead 330 also advances. By this advance, the sliding unit 325 including the core holding member 324 is also advanced.

  At this time, the protrusion 327 of the rotor 326 changes from the moving cam peak 320 of the slider 316 to the fixed cam peak 311 of the tip member 302 while sliding on the inclined surface. By this transfer, the rotor 326 is rotated by a half pitch.

  In this state, the protrusion 327 has moved to the fixed cam deep mountain 311 which is the next cam mountain (see FIG. 28), compared to before the writing pressure is applied (see FIG. 24). At the same time, the cam bottom 313 of the fixed cam crest 308 and the cam deep bottom 314 of the fixed cam crest 311 have a position difference L in the front-rear direction, and the rotor is compared with that before the writing pressure is applied by this difference L. 326 moves forward. As the rotor 326 advances, the chuck unit 350 also advances by L while holding the core 330.

  At this time, since the core holding force of the chuck unit 350 is larger than the core holding force of the core holding member 324, the core 330 slides with the core holding member 324 and moves forward by L together with the chuck unit 350. Extruded. That is, the core 330 protrudes by a difference L between the cam bottom 313 and the cam deep bottom 314 in the front-rear direction (see FIG. 24).

  If writing continues further, as shown in FIGS. 29 and 30, the tip of the core 330 comes into contact with the paper surface 366 again, and a backward force (writing pressure) acts on the core 330. This backward force (writing pressure) is transmitted from the core 330 to the chuck 342, and the chuck 342 attempts to move backward, but is interposed in the hemispherical concave portion 343 on the front outer peripheral surface of the chuck 342. Due to the wedge action with the inclined inner surface 337 against which the ball 344 abuts, the chuck 342 is firmly closed and firmly holds the core 330 so that it cannot be retracted. That is, the operation is the same as in FIG.

  At this time, the protrusion 327 of the rotor 326 is pushed up from the fixed cam deep mountain 311 of the tip member 302 by the moving cam deep mountain 321 of the slider 316, and slides on the inclined surface to the moving cam deep mountain 321. Change. By this transfer, the rotor 326 is rotated by a half pitch. Further, at the time of the transfer, the thin portion of the rotor 326 extends due to its own elastic restoring force. Therefore, the protrusion 327 is urged forward, and the protrusion 327 is in contact with the moving cam crest 320.

  Next, FIG. 31 and FIG. 32 show a state where the writing is finished and the writing pressure is released. When the writing pressure is released, the chuck unit 350 moves forward while holding the lead 330 by the forward biasing force of the writing pressure receiving spring 352. As the chuck unit 350 advances, the lead holding member 324 that holds the lead 330 also advances. By this advancement, the sliding unit 325 including the core holding member 324 also advances.

  At this time, the protrusion 327 of the rotor 326 moves from the moving cam deep mountain 321 of the slider 316 to the fixed cam mountain 310 of the tip member 302 while sliding on the inclined surface. By this transfer, the rotor 326 is rotated by a half pitch. In this state, the protrusion 327 has moved from the position of the fixed cam peak 311 (see FIG. 28) to the fixed cam peak 310 which is the next cam peak (see FIG. 32).

  At this time, as described above, since there is a difference in the longitudinal direction between the cam bottom 313 and the cam deep bottom 314, the advance of the chuck unit 350 is stopped at the rear by L, which is the same as in FIG. Return to position.

  Further, the sliding unit 325 has the outer peripheral step 323 of the slider 316 on the tip step 315 of the tip member 302 by the biasing force of the tip spring 353 even after the advance of the chuck unit 350 is stopped. Advance until it touches.

  At this time, the lead holding force of the lead holding member 324 included in the sliding unit 325 is larger than the gripping force of the chuck unit 350 when the lead advances, so that the lead holding member 324 is moved to the chuck unit 350 by this movement. The core 330 is pulled out from the front. Further, since the sliding unit 325 and the core 330 move forward together by the core holding force of the core holding member 324, the protruding length of the core 330 from the tip of the slider 316 does not change. By this series of operations, the feeding operation of the core 330 is completed.

  As described above, since the core holding member 324 is an elastic resin, the core holding member 324 is elastically deformed back and forth with the back and forth movement of the core 330 during the operation of intermittently extending the core. At this time, the outer diameter and inner diameter of the core holding member 324 and the inner diameter of the slider 316 for press-fitting and fixing the core holding member 324 therein have individual differences within the range of manufacturing quality control. Individual differences occur in the amount of elastic deformation before and after the core holding member 324.

  Further, as described above, the rotor 326 can be expanded and contracted back and forth by elastic deformation of the thin portion. That is, the rotor 326 expands and contracts back and forth, thereby following individual differences in the amount of elastic deformation before and after the core holding member 324. As a result, this contributes to the stability of the above-described operation of intermittently extending the lead.

  As shown in FIG. 33, the feeding frequency of the core 330 is such that the number of moving cam deep peaks 321 relative to the number of moving cam peaks 320 of the serrated moving cam 319 formed on the slider 316 and the tip member The number of fixed cam deep mountains 311 with respect to the number of fixed cam peaks 310 of the serrated fixed cam 308 formed in 302 is determined. That is, it is determined by the ratio of the number of cam mountains and cam deep mountains.

  Further, the feeding length of the core 330 in one feeding operation is determined by the difference L in the front-rear direction between the cam bottom 313 of the fixed cam peak 310 and the cam deep bottom 314 of the fixed cam peak 311.

  The actual mechanical pencil lead consumption varies depending on the hardness and paper quality of the writing lead, the language used, etc., but depending on the use situation, the ratio of the number of cam peaks and cam deep peaks and the fixed cam peaks What is necessary is just to set suitably the difference L of the position of the cam bottom 313 of 310, and the cam deep bottom 314 of the said fixed cam deep mountain 311 in the front-back direction. In this embodiment, since the cams are regularly arranged at a ratio of one cam peak to ten cam peaks, the intermittent feeding of the core 330 is performed once by adding and releasing the writing pressure 11 times. It becomes operation.

  Next, the basic structure of a mechanical pencil having a lead-out structure according to the fourth embodiment of the present invention will be described. In the shaft tube or the tip member, the reciprocating operation and the advancing operation are received by the slider having the core holding member fixed therein, the retreating operation by the writing pressure received by the lead and the advancing operation by releasing the writing pressure. A rotor that converts the rotation into one direction, a sleeve that rotates in conjunction with the rotor, and a slider presser are provided.

  In the state where the writing pressure is released, the sleeve is in contact with a slope-shaped cam provided on a step portion in the tip member, and a protrusion provided to protrude forward on the front surface of the sleeve, By utilizing the axial step of the slope-shaped cam, the amount of movement of the rotor in the axial direction is regulated, so that the lead can be intermittently drawn out. This intermittent lead feeding operation realized continuous writing without the user changing the mechanical pencil during writing.

  A mechanical pencil lead-out structure of the present invention will be described based on the fourth embodiment. FIG. 34 is a longitudinal sectional view showing the configuration of the fourth embodiment of the present invention, FIG. 35 is a partially enlarged longitudinal sectional view, and FIG. 36 is a perspective view showing the positional relationship of component assembly around the pen tip. is there.

  A front member 402 is fixed to the front of the outer shaft tube 401 by means such as screwing. Inside the tip member 402, a hole 403 having a plurality of step portions penetrates in the axial direction. A slider 420 is inserted in front of the tip member 402 and is slidable back and forth in a state of protruding outward from a slider guide hole 404 opened at the front end of the tip member 402.

  A rotation regulating hole 405 having a diameter larger than that of the slider guide hole 404 is provided behind the slider guide hole 404. A plurality of guide grooves 406 are provided on the inner surface of the rotation restricting hole 405, and a plurality of ribs 421 projecting outwardly from the outer peripheral surface of the slider 420 are inserted.

  The width of the guide groove 406 is slightly wider than the width of the rib 421, and the slider 420 is slidable in the front-rear direction and is arranged to restrict rotation. In this embodiment, the guide groove 406 and the rib 421 are provided at three locations, respectively. However, the purpose is to stably and freely move the slider 420 back and forth and to restrict the rotation. It is not limited to three places.

  In addition, a core holding member 424 is press-fitted and fixed in front of the inside of the slider 420 to constitute a sliding unit 426 together with the slider. Further, a sleeve guide hole 407 having a diameter larger than that of the rotation restricting hole 405 is provided behind the rotation restricting hole 405, and a sleeve 427 is inserted therein and rotatably disposed. A slope-shaped cam 408 is provided at the front step portion of the sleeve guide hole 407.

  A plurality of projections 428 protruding forward are provided at equal angular intervals on the front surface of the sleeve 427, and the front end surface 429 of the projection 428 is in contact with the cam 408. At this time, the front end surface 429 of the protrusion 428 is inclined according to the angle of the inclined surface 409 of the cam 408 and is in contact with each other on the surface.

  In addition, a stepped hole 430 passes through the sleeve 427 in the axial direction. The sliding unit 426 is inserted into the stepped hole 430 and is rotatably arranged. Further, a slider presser 435 is press-fitted into the stepped hole 430 and is disposed integrally with the sleeve 427.

  The axial distance A between the step 431 of the stepped hole 430 and the front step 436 of the slider presser 435 is slightly smaller than the axial distance B of the flange 423 behind the slider 420. The sliding unit 426, the sleeve 427, and the slider presser 435 are integrally arranged in the axial direction with a slight gap C in the axial direction. As a result, the sliding unit 426, the sleeve 427, and the slider presser 435 constitute a core feeding unit 432.

  Further, a rotor guide hole 412 having a diameter larger than that of the sleeve guide hole 407 is provided behind the sleeve guide hole 407, and a rotor 437 is inserted therein and is rotatably arranged. A hole 438 having a step portion passes through the rotor 437 and is externally inserted into the core feeding unit 432.

  A plurality of ribs 433 project from the outer periphery of the core feed unit 432 at equal angular intervals, and are inserted into a plurality of guide grooves 439 provided on the front inner surface of the hole 438 of the rotor 437. At this time, the width of the guide groove 439 is slightly wider than the width of the rib 433 so that the core feeding unit 432 is slidable in the front-rear direction and rotates together with the rotor 437. Placed in.

  Further, a tip spring 446 is disposed between the rear step 434 of the core feed unit 432 and the rear step 440 of the hole 438 of the rotor 437, and biases the core feed unit 432 forward, A projection 428 of the sleeve 427 is pressed against the slope-shaped cam 408.

  Further, a serrated front cam 413 is provided at the front step portion of the rotor guide hole 412. Further, a sawtooth front cam 441 is provided on the front surface of the rotor 437 and is in contact with the front cam 413. At this time, the front cam 441 has a shape similar to that of the front cam 413 and is engaged with and in contact with each other.

  Further, a rear cam cylinder guide hole 417 having a diameter larger than that of the rotor guide hole 412 is provided behind the rotor guide hole 412, and the rear cam cylinder 447 is inserted therein. A plurality of locking ribs 418 projecting inward are provided on the inner surface of the rear cam cylinder guide hole 417, and a plurality of locking grooves provided on the outer peripheral surface of the rear cam cylinder 447 are provided. It is fitted in 448 and restricts the rotation of the rear cam cylinder 447.

  In addition, a hole 449 having a step portion passes through the inside of the rear cam cylinder 447, and the rotor 437 is inserted from the front, and is arranged rotatably. Further, an inclined step 450 is provided behind the hole 449, and the inclined step 450 is inclined from a direction orthogonal to the axis, and the rear end 445 of the rotor 437 is more than the inclined step 450. A part protrudes rearward.

  Further, an inclined plate 457 is inserted into the hole 449 of the rear cam cylinder 447 from the rear, and a front surface 458 thereof is disposed in contact with both the inclined step portion 450 and the rear end portion 445 of the rotor 437. . At this time, the inclined plate 457 has a point of contact with the inclined step portion 450 as a fulcrum 459, is separated from the inclined surface 451 of the inclined step portion 450 and is in contact with the rear end portion 445, and the rotor As the 437 slides back and forth, it can swing freely.

  Further, a rear cam cylinder presser 463 is fitted and fixed to the rear cam cylinder guide hole 417 behind the rear cam cylinder 447 using a method such as press fitting. At this time, the front end surface 464 of the rear cam cylinder presser 463 contacts the rear surface of the rear cam cylinder 447, and the step 452 of the rear cam cylinder 447 contacts the front step 419 of the rear cam cylinder guide hole 417. The rear cam cylinder 447 is restricted from moving in the front-rear direction.

  In addition, a saw-toothed rear cam 453 is provided on the front surface of the rear cam cylinder 447 and is disposed so as to face and separate from the saw-toothed rear cam 443 provided on the outer peripheral stage of the rotor 437. At this time, the distance between the rear cam 453 and the rear cam 443 is substantially the same as the cam peak height of the rear cam.

  Further, a chuck lid cylinder 465 is disposed behind the inclined plate 457 and is in contact with the rear surface 460 of the inclined plate 457. At this time, the position where the chuck lid cylinder 465 contacts the inclined plate 457 is closer to the fulcrum 459 than the position where the rotor 437 contacts the inclined plate front surface 458.

  Further, an inclined cylindrical body 469 is inserted into the inside of the chuck lid cylinder 465 from the rear, and is arranged to be slidable back and forth. A rear end knock spring 475 is disposed between the rear end surface 466 of the chuck lid cylinder 465 and the rear flange 470 of the inclined cylinder body 469, and always biases the chuck lid cylinder 465 forward. Yes.

  Further, a chuck 476 is inserted into the inclined cylindrical body 469. A hemispherical recess 477 is provided in front of the chuck 476, and a spherical ball 480 is disposed between the inclined cylindrical body 469 and the inclined inner surface 471. Further, a flanged cylinder body 481 is fitted into the inclined cylinder body 469 from the rear and is press-fitted and fixed.

  A chuck spring 483 is disposed between the front inner step 482 of the flanged cylinder 481 and the rear step 478 of the chuck 476, and always urges the chuck 476 rearward. A chuck unit 484 including the chuck lid cylinder 465 and the chuck 476 is disposed in the outer shaft cylinder 401 so as to be movable back and forth, and is always urged forward by a pen pressure receiving spring 485.

  The inclined plate 457 is disposed in front of the chuck unit 484, and the inclined plate 457 is always urged forward by the elastic force of the writing pressure receiving spring 485. That is, the inclined plate 457 has the fulcrum 459 as the center, the contact point with the chuck lid cylinder 465 is a force point 461, and the contact point with the rotor 437 is an action point 462. 437 is activated. At this time, the front cam 441 of the rotor 437 is in contact with the front cam 413 by the urging force of the writing pressure receiving spring 485.

  A lead tank 486 is inserted behind the chuck unit, and the lead tank 486 is slidably disposed in the front-rear direction. Further, a step portion 487 is provided at the rear portion of the core tank 486, and a rear end knock auxiliary spring 492 is disposed between the rear step portion 498 provided in the rear inside of the outer shaft tube 401, and The lead tank 486 is always urged backward.

  Further, a tail tube 493 is fitted and fixed behind the outer shaft tube 401 by means such as press fitting. The tail tube 493 has a bottomed cylindrical shape, and a hole 495 is provided through the bottom surface 494 thereof, and the rear surface 488 of the step portion 487 of the core tank 486 is in contact with the bottom surface 494. That is, the tail pipe 493 prevents the core tank 486 from being detached rearward by the urging force of the rear end knock auxiliary spring 492.

  Further, a knock holding portion 489 is provided behind the core tank 486 and protrudes through the hole 495 of the tail tube 493 to the outside. A stepped hole 490 is provided inside the knock holding portion 489, and an eraser 496 is inserted and held from behind.

  Further, a lead retaining hole 491 having a smaller diameter than the stepped hole 490 is continuously provided in front of the stepped hole 490 and penetrates the lead tank 486. Further, a knock 497 is press-fitted into the knock holding portion 489, contains the eraser 496, and is fixed integrally with the core tank 486.

  The above is the configuration of the present embodiment. The present embodiment is characterized by the operations of the core feeding unit 432, the rotor 437, and the inclined plate 457.

Further, each member will be described in detail.
The sliding unit 426 includes the slider 420 and the core holding member 424 as described above. The core holding member 424 has a through hole 425 in the axial direction, and has a conical shape with a flat tip at the front and a cylindrical shape at the rear. A core 499 is inserted into the through hole 425. The core holding member 424 is press-fitted and fixed to the inner step 422 of the slider 420 and is compressed inward, so that the diameter of the through hole 425 is slightly reduced.

  The material used for the core holding member 424 may be any resin having elasticity, and specific examples include nitrile butadiene rubber, silicone rubber, and fluorine rubber. That is, a desired core holding force is generated by the reduced diameter of the through hole 425 by press-fitting and the elastic material.

  A sawtooth front cam 441 is formed on the front surface of the rotor 437. The front cam 441 has a plurality of front cam peaks 442 formed radially from the axial center of the rotor 437.

  The saw-toothed front cam 413 of the tip member 402 is formed with a plurality of forward cam peaks 414 radially from the axial center of the tip member 402, as with the front cam 441. A sawtooth rear cam 443 is formed on the rear surface of the rotor 437. The rear cam 443 has a plurality of rear cam peaks 444 formed radially from the axial center of the rotor 437. Further, the sawtooth-shaped rear cam 453 of the rear cam cylinder 447 has a plurality of rear cam peaks 454 formed radially from the axial center of the rear cam cylinder 447 in the same manner as the rear cam 443.

  As described above, the rotor 437 is slidable in the front-rear direction with respect to the tip member 402 and is rotatably disposed. At this time, the apex 415 of the front cam 413 and the apex 455 of the rear cam 453 are arranged so as to be shifted by a half pitch.

  As described above, the chuck unit 484 includes the chuck lid cylinder 465, the inclined cylinder body 469, the rear end knock spring 475, the chuck 476, the ball 480, the flanged cylinder body 481, and the chuck spring 483.

  The inclined cylinder 469 is inserted into the chuck lid cylinder 465 from the rear, and the locking hole 472 opened on the outer periphery of the inclined cylinder 469 is directed inward to the rear part of the chuck lid cylinder 465. The locking protrusion 467 that is projected in this manner is inserted. The rear end knock spring 475 is disposed between the rear end surface 466 of the chuck lid cylinder 465 and the rear flange 470 of the inclined cylinder body 469 so as to cover the outer periphery 474 of the inclined cylinder body 469. The lid cylinder 465 is always urged forward.

  As a result, the locking surface 468 of the locking protrusion 467 and the front end surface 473 of the locking hole 472 come into contact with each other, and the chuck lid cylinder 465 is locked to the inclined cylinder body 469. The inner diameter of the chuck lid cylinder 465 is slightly larger than the outer diameter of the outer periphery 474 of the inclined cylinder body 469, and slides in the front-rear direction against the urging force of the rear end knock spring 475. It is free to move.

  Further, the chuck 476 is inserted into the inclined cylindrical body 469. The semispherical concave portion 477 is provided in front of the chuck 476, and a spherical ball 480 is disposed between the inclined cylindrical body 469 and the inclined inner surface 471.

  Further, the flanged cylindrical body 481 is fitted into the inclined cylindrical body 469 from behind and is press-fitted and fixed. The chuck spring 483 is disposed between the front inner step 482 of the flanged cylinder 481 and the rear step 478 of the chuck 476 so as to cover the outer periphery 479 of the chuck 476, and the chuck 476. Is always energized backward.

  That is, the chuck spring 483 biases the chuck 476 rearward, thereby causing the chuck 476 to act in a closing direction via the ball 480 that is in contact with the inclined inner surface 471, thereby gripping the core 499. That is, a ball chuck mechanism that allows the lead 499 to move forward but prevents its backward movement by a wedge action. In the present embodiment, the chuck 476 is configured by mutually opposing chuck pieces having the same shape divided into two.

  The inclined cylindrical body 469 and chuck 476 constituting the chuck unit 484 are made of a metal having excellent strength and durability, such as copper and its alloy, iron and its alloy, aluminum and its material, because the ball 480 is in contact therewith. Alloys, zinc and alloys thereof are desirable, but relatively hard synthetic resins such as acrylonitrile, polycarbonate, polyacetal, etc., and those synthetic resins filled with inorganic powder, glass fiber, carbon fiber, etc. Also good.

  Further, the order of each of the biasing force of each spring, the core holding force of the core holding member 424, and the core gripping force of the ball chuck mechanism will be described in detail. The following magnitude relationship is required in order from the weakest.

  That is, the gripping force when the lead of the ball chuck mechanism advances is weaker than the biasing force of the tip spring 446, and the biasing force of the tip spring 446 is weaker than the lead holding force of the lead holding member 424. The force is weaker than the urging force of the pen pressure receiving spring 485, and the urging force of the writing pressure receiving spring 485 is weaker than the urging force of the rear end knock spring 475, and the urging force of the rear end knock spring 475 is the ball chuck mechanism. It is set to be weaker than the gripping force when the core is retracted.

  More specifically, in this embodiment, the gripping force of the ball chuck mechanism when the lead moves forward is 0.059 N or more and 0.245 N or less, and the urging force of the tip spring 446 is 0.117 N or more and 0.343 N or less. Further, the lead holding force of the lead holding member 424 is 0.166 N or more and 0.49 N or less, and the urging force of the writing pressure receiving spring 485 is 0.588 N or more and 3.43 N or less, and the rear end knock spring 475. The urging force is 1.47 N or more and 4.9 N or less, and the gripping force when the core of the ball chuck mechanism is retracted is 7.84 N or more.

  Next, the operation of intermittently extending the lead in the fourth embodiment of the present invention will be described. 37 to 44 are operation diagrams for intermittently extending the lead. Regarding the operation of intermittently feeding the lead, a protrusion 428 formed on the lead feeding unit 432, a slope-shaped cam 408 and a front cam 413 formed on the tip member 402, and a rear formed on the rear cam cylinder 447. The relationship between the cam 453, the front cam 441 and the rear cam 443 formed on the rotor 437, and the inclined plate 457 will be described.

  FIG. 37 and FIG. 38 show a state where the core 499 protrudes from the tip of the slider 420. In this state, the protrusion 428 is located in the valley 410 of the slope-shaped cam 408 formed on the tip member 402.

  Next, when the tip of the core 499 protruding from the tip of the slider 420 is brought into contact with the paper surface 500 for writing, a backward force (writing pressure) is applied to the core 499 (writing pressure). With added). This backward force (writing pressure) is transmitted from the core 499 to the chuck 476, and the chuck 476 attempts to retreat.

  At this time, since the ball 480 interposed in the hemispherical concave portion 477 on the front outer peripheral surface of the chuck 476 is in contact with the inclined inner surface 471, a wedge action occurs, and the chuck 476 is firmly closed, As a result, the core 499 is firmly gripped so that it cannot be retracted. That is, the retraction of the core 499 is prevented by the wedge action.

  Further, when the writing pressure applied by the user to the paper surface 500 is increased and the writing pressure exceeds the forward biasing force of the writing pressure receiving spring 485, the writing pressure receiving spring 485 is bent and the chuck unit 484 is moved backward. . As the chuck unit 484 moves backward, the rotor 437 moves backward by the biasing force of the tip spring 446.

  At this time, the rotor 437 pushes the inclined plate 457 rearward at the operating point 462, and the inclined plate 457 swings backward around the fulcrum 459. At the same time, when the rotor 437 is retracted, the rear cam 443 comes into contact with the rear cam 453 of the rear cam cylinder 447, and the rear cam peak 444 slides along the slope 456 of the rear cam peak 454. 437 rotates half a pitch.

  Further, the core feeding unit 432 rotates integrally with the rotor 437, and the protrusion 428 slides along the slope 409 of the slope-shaped cam 408 formed on the tip member 402. The core feed unit 432 moves backward by the amount of axial movement due to sliding (see FIGS. 39 and 40).

  Next, FIG. 41 and FIG. 42 show a state where the writing is finished and the writing pressure is released. When the writing pressure is released, the chuck unit 484 moves forward while holding the lead 499 by the forward biasing force of the writing pressure receiving spring 485.

  As the chuck unit 484 advances, the inclined plate 457 swings forward about the fulcrum 459. At the same time, the inclined plate 457 pushes the rotor 437 forward at the operating point 462. At the same time, when the rotor 437 moves forward, the front cam 441 comes into contact with the front cam 413, the front cam peak 442 slides along the slope 416 of the front cam peak 414, and the rotor 437 rotates half a pitch. Move. Further, the core feed unit 432 rotates integrally with the rotor 437, the protrusion 428 slides along the slope 409 of the slope-shaped cam 408 formed on the tip member 402, and the protrusion 428 slides. The lead feeding unit 432 moves backward by the amount of movement in the axial direction due to.

  When the writing is continued, the operation when the writing pressure is applied and the operation when the writing pressure is released are repeated. That is, the operation when the writing pressure is applied to each stroke of writing and the operation when the writing pressure is released are repeated as a series.

  When this series of operations is repeated a plurality of times, that is, when a plurality of writings are performed, the protrusion 428 on the front surface of the sleeve 427 is formed on the slope-shaped cam 408 formed on the tip member 402 as shown in FIG. The protrusion 428 moves to the vicinity of the apex 411 of the cam 408 repeatedly.

  Further, when one-stroke writing is performed, after the operation when the above-described writing pressure is applied, when the writing pressure is released, the chuck unit 484 causes the core 499 to be moved by the forward biasing force of the writing pressure receiving spring 485. Advance while holding.

  As the chuck unit 484 advances, the inclined plate 457 swings forward about the fulcrum 459. At the same time, the inclined plate 457 pushes the rotor 437 forward at the operating point 462. At the same time, when the rotor 437 advances, the front cam 441 comes into contact with the front cam 413, the front cam peak 442 slides along the slope 416 of the front cam peak 414, and the rotor 437 is half Pitch rotation.

  At the same time, the core feeding unit 432 rotates integrally with the rotor 437, the protrusion 428 slides along the slope 409 of the slope-shaped cam 408 formed on the tip member 402, and the protrusion 428. Is moved from the apex 411 of the slope-shaped cam 408 to the valley 410 by the forward biasing force of the tip spring 446. That is, the core feed unit 432 moves forward by an axial movement distance L from the vertex 411 to the valley 410.

At this time, the lead holding member 424 included in the lead feeding unit 432 moves forward while holding the lead 499 by the lead holding force of the lead holding member 424. That is, the lead 499 is pulled forward against the gripping force when the lead of the ball chuck mechanism is advanced. (See FIG. 44).
This repetitive operation completes the lead 499 feeding operation.

  As described above, the position of the force point 461 where the chuck lid cylinder 465 contacts the inclined plate 457 is closer to the fulcrum 459 than the position of the action point 462 where the rotor 437 contacts the inclined plate 457. That is, the inclined plate 457 is a lever that swings around the fulcrum 459 with the difference in distance as a ratio. At this time, the moving distance before and after the chuck lid cylinder 465 is a distance obtained by dividing the moving distance before and after the rotor 437 by the lever ratio (1: 2.9).

  As described above, the operation of intermittently extending the lead moves back and forth the distance D between the position where the rotor 437 contacts the front cam 413 and the position where the rotor 437 contacts the rear cam 453. In other words, the distance by which the chuck unit 484 having the chuck lid cylinder 465 as the constituent member grips and retracts the core 499 with the writing pressure by the writing operation can be a distance obtained by dividing the distance D by the leverage ratio. . That is, by providing the inclined plate 457, it is possible to reduce the retreat distance of the lead by writing, and as a result, it is possible to reduce the uncomfortable feeling to the user that occurs due to the retreat of the lead during writing.

  The feeding frequency of the core 499 is the sawtooth-shaped front cam 413 formed on the tip member 402, the front cam 441 and the rear cam crest 443 of the rotor 437, and the rear cam 453 of the rear cam cylinder 447. It is determined by the number of cam ridges and the number of the slope-shaped cams 408. That is, with respect to the angle from the valley 410 to the vertex 411 of one slope-shaped cam 408, it is determined by the number of each cam crest required to rotate the angle.

  Further, the feeding length of the core 499 in a series of feeding operations is determined by the axial movement distance L from the apex 411 to the valley 410 of the slope-shaped cam 408.

  The actual consumption amount of the core of the mechanical pencil varies depending on the strength of the writing pressure, the hardness and paper quality of the writing core, the language used, and the like. For the angle from the top to the top 411, the number of cam peaks required to rotate the angle and the axial movement distance L from the top 411 to the trough 410 of the slope-shaped cam 408 are appropriately set. It ’s fine.

  In this embodiment, the number of each cam crest required to rotate 120 degrees with respect to an angle of 120 degrees from the valley 410 to the vertex 411 of one cam 408 is 12 and regularly arranged. Thus, the intermittent feeding operation of the core 499 is performed once by adding and releasing the writing pressure 12 times.

  Further, the operation of intermittently feeding the lead 499 is such that the writing pressure generated when the tip of the lead 499 comes into contact with the paper surface 500 when a user writes exceeds the forward biasing force of the writing pressure receiving spring 485. It is done at the time. At this time, the writing pressure varies depending on the user. Furthermore, the writing pressure differs for each stroke of writing. That is, the frequency of the feeding operation can be changed by changing the setting of the forward biasing force of the writing pressure receiving spring 485 with respect to the writing pressure of the user.

  Further, as described above, the consumption of the core 499 varies depending on the strength of the writing pressure. That is, by appropriately setting the forward biasing force of the writing pressure receiving spring 485 with respect to the writing pressure that is different for each user, the amount of feeding of the core 499 is reduced to the amount of consumption of the core 499 of the user. Can be matched. At this time, the setting of the forward urging force can be changed by replacing the writing pressure receiving spring 485 with a different urging force.

  The writing pressure receiving spring 485 can be replaced by separating the tip member 402 containing the core feeding unit 432 and the rotor 437 and the chuck unit 484 from the outer shaft tube 401 forward. Easy to do.

  Next, the basic structure of a mechanical pencil having a lead-out structure according to the fifth embodiment of the present invention will be described. In the shaft tube or the tip member, the reciprocating operation and the advancing operation are received by the slider having the core holding member fixed therein, the retreating operation by the writing pressure received by the lead and the advancing operation by releasing the writing pressure. A rotor is provided that converts to one-way rotation.

  In the state where the writing pressure is released, the slider has a protrusion provided on the front surface of the rear large-diameter portion of the slider that abuts against a slope-shaped cam provided on a step portion in the tip member. By using the axial step of the slope-shaped cam, the amount of axial movement of the rotor is regulated, so that the lead can be intermittently drawn out. This intermittent lead feeding operation realized continuous writing without the user changing the mechanical pencil during writing.

  Based on the fifth embodiment, the mechanical pencil lead-out structure of the present invention will be described. 45 is a longitudinal sectional view showing the configuration of the fifth embodiment of the present invention, FIG. 46 is a partially enlarged longitudinal sectional view, and FIG. 47 is a perspective view showing the positional relationship of component assembly around the pen tip. is there.

  A front member 502 is fixed to the front of the outer shaft cylinder 501 by means such as screwing. Inside the tip member 502, a hole 503 having a plurality of step portions penetrates in the axial direction. A slider 518 is inserted in front of the tip member 502 and is slidable back and forth and rotated in a state of protruding outward from a slider guide hole 504 opened at the front end of the tip member 502. .

  A slider holding hole 505 having a diameter larger than that of the slider guide hole 504 is provided behind the slider guide hole 504, and the rear large-diameter portion 521 of the slider 518 is inserted. . A slope-like cam 506 is provided at the front step of the slider holding hole 505.

  A plurality of protrusions 525 projecting forward are provided at equal angular intervals on the front surface of the rear large-diameter portion 521 of the slider 518, and the front end surface 526 of the protrusion 525 is in contact with the cam 506. . At this time, the front end surface 526 of the protrusion 525 is inclined according to the angle of the inclined surface 507 of the cam 506 and is in contact with each other on the surface.

  Further, a core holding member 522 is press-fitted and fixed in front of the slider 518 to form a core feeding unit 524 together with the slider. Further, a rotor guide hole 510 having a diameter larger than that of the slider holding hole 505 is provided behind the slider holding hole 505, and the rotor 528 is inserted therein and is rotatably arranged. The A hole 529 having a step portion passes through the rotor 528 and is externally inserted into the core feeding unit 524.

  A plurality of engaging grooves 519 are provided at equal angular intervals on the outer periphery of the core feeding unit 524, and a plurality of ribs 530 are inserted on the front inner surface of the hole 529 of the rotor 528. At this time, the width of the engagement groove 519 is slightly wider than the width of the rib 530, and the core feeding unit 524 is slidable in the front-rear direction and rotates integrally with the rotor 528. Are arranged as follows.

  Further, a tip spring 536 is disposed between the rear step portion 527 of the core feeding unit 524 and the rear step portion 531 of the hole 529 of the rotor 528, and biases the core feeding unit 524 forward, The protrusion 525 is pressed against the slope-shaped cam 506.

  Further, a serrated front cam 511 is provided at the front step portion of the rotor guide hole 510. Further, a sawtooth front cam 532 is provided on the front surface of the rotor 528 and is in contact with the front cam 511. The front cam 532 has a shape similar to that of the front cam 511, and is engaged with and in contact with each other. Further, a rear cam cylinder guide hole 515 having a diameter larger than that of the rotor guide hole 510 is provided behind the rotor guide hole 510, and a rear cam cylinder 447 is inserted therein.

  As shown in FIG. 45, the structure behind the rear cam cylinder 447 is the same as that of the fourth embodiment, and the description of the structure is omitted.

Further, each member will be described in detail.
The lead feeding unit 524 includes the slider 518 and the lead holding member 522 as described above. The core holding member 522 has a through hole 523 in the axial direction, and has a conical shape with a flat tip at the front and a cylindrical shape at the rear. A core 499 is inserted into the through hole 523. The core holding member 522 is press-fitted and fixed to the inner step portion 520 of the slider 518 and compressed inward, so that the diameter of the through hole 523 is slightly reduced.

  The material used for the core holding member 522 may be an elastic resin, and specific examples thereof include nitrile butadiene rubber, silicone rubber, and fluorine rubber. That is, a desired core holding force is generated by the reduced diameter of the through hole 523 by press-fitting and the elastic material.

  A sawtooth front cam 532 is formed on the front surface of the rotor 528. The front cam 532 has a plurality of front cam peaks 533 formed radially from the axial center of the rotor 528. Further, the sawtooth-shaped front cam 511 of the tip member 502 has a plurality of forward cam peaks 512 formed radially from the center of the tip of the tip member 502, similarly to the front cam 532.

  Further, a sawtooth rear cam 534 is formed on the rear surface of the rotor 528. The rear cam 534 has a plurality of rear cam peaks 535 formed radially from the axial center of the rotor 528. In addition, the sawtooth-shaped rear cam 453 of the rear cam cylinder 447 has a plurality of rear cam peaks 454 formed radially from the axial center of the rear cam cylinder 447, similarly to the rear cam 534.

  As described above, the rotor 528 is slidable in the front-rear direction with respect to the tip member 502 and is rotatably disposed. At this time, the vertex 513 of the front cam 511 and the vertex 455 of the rear cam 453 are arranged so as to be shifted by a half pitch.

  The structure and material of the chuck unit, the urging force of each spring, the core holding force of the core holding member 522, and the order of each force of the core gripping force of the ball chuck mechanism are the same as in the fourth embodiment. Therefore, the description is omitted.

  Next, the operation of intermittently extending the lead in the fifth embodiment of the present invention will be described. 48 to 55 are operation diagrams for intermittently extending the lead. Regarding the operation of intermittently feeding the lead, a protrusion 525 formed on the lead feeding unit 524, a slope-like cam 506 and a front cam 511 formed on the tip member 502, and a rear formed on the rear cam cylinder 447. The relationship between the cam 453, the front cam 532 and the rear cam 534 formed on the rotor 528, and the inclined plate 457 will be described.

  48 and 49 show a state in which the core 499 protrudes from the tip of the slider 518. FIG. In this state, the protrusion 525 is located at a valley 508 of a slope-shaped cam 506 formed on the tip member 502.

  When the tip of the core 499 protruding from the tip of the slider 518 is brought into contact with the paper surface 500 for writing, a backward force (writing pressure) is applied to the core 499 (the writing pressure is applied). State). This backward force (writing pressure) is transmitted from the core 499 to the chuck 476, and the chuck 476 attempts to retreat.

  At this time, since the ball 480 interposed in the hemispherical concave portion 477 on the front outer peripheral surface of the chuck 476 is in contact with the inclined inner surface 471, a wedge action occurs, and the chuck 476 is firmly closed, As a result, the core 499 is firmly gripped so that it cannot be retracted. That is, the retraction of the core 499 is prevented by the wedge action.

  Further, when the user increases the writing pressure applied to the paper surface 500 and the writing pressure exceeds the forward biasing force of the writing pressure receiving spring 485, the writing pressure receiving spring 485 is bent, and the chuck unit 484 is moved. fall back. As the chuck unit 484 is retracted, the rotor 528 is retracted by the biasing force of the tip spring 536.

  At this time, the rotor 528 pushes the inclined plate 457 rearward at the operating point 462, and the inclined plate 457 swings backward around the fulcrum 459. At the same time, when the rotor 528 is retracted, the rear cam 534 comes into contact with the rear cam 453 of the rear cam cylinder 447, and the rear cam peak 535 slides along the slope 456 of the rear cam peak 454. Turns half a pitch. Further, the core feeding unit 524 rotates integrally with the rotor 528, and the protrusion 525 slides along the slope 507 of the slope-shaped cam 506 formed on the tip member 502, and the protrusion 525 slides. The lead feeding unit 524 moves backward by the amount of movement in the axial direction (see FIGS. 50 and 51).

  Next, FIG. 52 and FIG. 53 show a state where the writing is finished and the writing pressure is released. When the writing pressure is released, the chuck unit 484 moves forward while holding the lead 499 by the forward biasing force of the writing pressure receiving spring 485. As the chuck unit 484 advances, the inclined plate 457 swings forward about the fulcrum 459. At the same time, the inclined plate 457 pushes the rotor 528 forward at the operating point 462. At the same time, when the rotor 528 moves forward, the front cam 532 comes into contact with the front cam 511, the front cam peak 533 slides along the slope 514 of the front cam peak 512, and the rotor 528 rotates half a pitch. Move. Further, the core feeding unit 524 rotates integrally with the rotor 528, the protrusion 525 slides along the slope 507 of the slope-shaped cam 506 formed on the tip member 502, and the protrusion 525 slides. The lead feeding unit 524 moves backward by the amount of movement in the axial direction.

  Furthermore, when writing is continued, the operation when the writing pressure is applied and the operation when the writing pressure is released are repeated. That is, the operation when the writing pressure is applied to each stroke of writing and the operation when the writing pressure is released are repeated as a series.

  When this series of operations is repeated a plurality of times, that is, when writing is performed a plurality of times, as shown in FIG. 54, the protrusion 525 repeatedly slides on the slope-shaped cam 506 formed on the tip member 502, The protrusion 525 moves to the vicinity of the vertex 509 of the cam 506.

  Further, when one-stroke writing is performed, after the operation when the above-described writing pressure is applied, when the writing pressure is released, the chuck unit 484 causes the core 499 to be moved by the forward biasing force of the writing pressure receiving spring 485. Advance while holding. As the chuck unit 484 advances, the inclined plate 457 swings forward about the fulcrum 459. At the same time, the inclined plate 457 pushes the rotor 528 forward at the operating point 462. At the same time, when the rotor 528 advances, the front cam 532 comes into contact with the front cam 511, the front cam peak 533 slides along the slope 514 of the front cam peak 512, and the rotor 528 is half pitched. Rotate. At the same time, the lead feeding unit 524 rotates integrally with the rotor 528, the protrusion 525 slides along the slope 507 of the slope-shaped cam 506 formed on the tip member 502, and the protrusion 525. Is moved from the apex 509 to the valley 508 of the slope-shaped cam 506 by the forward biasing force of the tip spring 536.

  That is, the core feeding unit 524 moves forward by an axial movement distance L from the vertex 509 to the valley 508. At this time, the lead holding member 522 included in the lead feeding unit 524 moves forward while holding the lead 499 by the lead holding force of the lead holding member 522. That is, the lead 499 is pulled forward against the gripping force when the lead of the ball chuck mechanism is advanced. (See FIG. 55).

  This repetitive operation completes the lead 499 feeding operation.

  The difference between the fourth embodiment and the fifth embodiment will be described. In the fourth embodiment, the lead feeding unit 432 includes a slider 420, a lead holding member 424, a sleeve 427, and a slider presser 435. In the fifth embodiment, the lead feeding unit 524 includes a slider 518 and a lead holding member 522. That is, the three parts of the slider, the sleeve, and the slider presser are integrated as a slider. In other words, it contributes to cost reduction by reducing the number of parts and the assembly process.

  The feeding frequency of the core 499 is determined by the sawtooth front cam 511 formed on the front member 502, the front cam 532 and the rear cam crest 534 of the rotor 528, and the rear cam 453 of the rear cam cylinder 447. It is determined by the number of cam ridges and the number of slope-like cams 506. That is, with respect to the angle from the valley 508 to the vertex 509 of one slope-shaped cam 506, it is determined by the number of each cam crest required to rotate the angle.

  Further, the feeding length of the core 499 in a series of feeding operations is determined by the axial movement distance L from the apex 509 to the valley 508 of the slope-shaped cam 506.

  The actual mechanical pencil lead wear amount varies depending on the hardness and paper quality of the writing lead, the language used, etc., but depending on the use situation, the angle from the valley 508 to the vertex 509 of the slope-shaped cam 506 On the other hand, the number of cam peaks required to rotate the angle and the axial movement distance L from the apex 509 to the valley 508 of the slope-shaped cam 506 may be set as appropriate.

  In this embodiment, the number of cam peaks required to rotate 120 degrees with respect to an angle of 120 degrees from the valley 508 to the apex 509 of one cam 506 is regularly arranged with twelve. Thus, the intermittent feeding operation of the core 499 is performed once by adding and releasing the writing pressure 12 times.

  Also, in the fifth embodiment, as in the fourth embodiment, by appropriately setting the front biasing force of the writing pressure receiving spring 485 with respect to the writing pressure that is different for each user, the core of the user is set. The feeding amount of the core 499 can be substantially matched to the consumption amount of 499.

  Changing the setting of the forward urging force is possible by exchanging the writing pressure receiving spring 485 with a different urging force as in the fourth embodiment. The writing pressure receiving spring 485 can be replaced by separating the tip member 502 containing the core feeding unit 524, the rotor 528, and the like, and the chuck unit 484 from the outer shaft cylinder 501 forward. Easy to do.

  Next, the basic structure of a mechanical pencil having a lead-out structure according to the sixth embodiment of the present invention will be described.

  In the shaft tube or the tip member, the reciprocating operation and the advancing operation are received by the slider having the core holding member fixed therein, the retreating operation by the writing pressure received by the lead and the advancing operation by releasing the writing pressure. A rotor is provided that converts to one-way rotation.

  In the state where the writing pressure is released, the slider has a protrusion provided on the front surface of the rear large-diameter portion of the slider that abuts against a slope-shaped cam provided on a step portion in the tip member. By using the axial step of the slope-shaped cam, the amount of axial movement of the rotor is regulated, so that the lead can be intermittently drawn out.

  This intermittent lead feeding operation realized continuous writing without the user changing the mechanical pencil during writing. Further, the shaft cylinder divided forward and rearward is relatively rotated (twisting operation), and the adjustment piece with which the rear end of the pen pressure receiving spring abuts is moved in the front-rear direction, so that the forward biasing force of the pen pressure receiving spring is increased. Can be changed.

  Since the lead feeding structure and the intermittent feeding operation of the sixth embodiment are the same as those of the fifth embodiment described above, the description thereof will be omitted. The lead feeding structure and the intermittent feeding operation may be the same as in the fourth embodiment.

  Next, a structure for adjusting the front biasing force of the writing pressure receiving spring 485 will be described based on the sixth embodiment. FIG. 56 is a longitudinal sectional view showing the configuration of the sixth embodiment of the present invention, and FIG. 57 is a partially enlarged longitudinal sectional view. FIG. 58 is a cross-sectional perspective view of the main part.

  A stepped hole 602 penetrates the front outer shaft cylinder 601 in the axial direction. A chuck unit 484 is inserted into the stepped hole 602 from the front and is slidable in the front-rear direction. Further, a spiral groove 604 is provided behind the stepped hole 602. Further, a rear outer shaft cylinder 605 is inserted into the stepped hole 602 from the rear, and is arranged to be rotatable.

  A front portion of the rear outer shaft cylinder 605 inserted into the stepped hole 602 is an engagement shaft portion 607 having a smaller diameter than the outer diameter portion 606 of the outer shaft cylinder 605 thereafter. In the engaging shaft portion 607, square grooves 608 having an axial direction as a longitudinal direction are opened at two opposing positions.

  The square groove 608 is open to the front end of the engagement shaft portion 607, and the front end of the engagement shaft portion 607 can be expanded by elastic deformation of the rear outer shaft cylinder 605. Further, the front end portion of the engagement shaft portion 607 is provided with a flange portion 609 having a diameter larger than that of the engagement shaft portion 607.

  The rear surface 610 of the flange portion 609 is in contact with the step portion 603 of the stepped hole 602 to prevent the rear outer shaft cylinder 605 from separating backward. Further, a stepped hole 611 passes through the rear outer shaft cylinder 605 in the axial direction. An adjustment piece 612 is inserted in front of the stepped hole 611.

  A prismatic engagement rib 613 is provided on the outer periphery of the adjustment piece 612 and is inserted into the square groove 608 opened in the engagement shaft portion 607. At this time, the width of the engagement rib 613 is slightly wider than the width of the square groove 608, the adjustment piece 612 is slidable in the front-rear direction, and is integrated with the rear outer barrel 605. It arrange | positions so that it may rotate.

  Further, a spiral mountain 614 is provided on the outer surface of the engagement rib 613 of the adjustment piece 612. The outer diameter of the spiral ridge 614 is larger than the outer diameter of the engagement shaft portion 607 and protrudes outward from the square groove 608. The spiral ridge 614 is inserted into the spiral groove 604 of the front outer shaft cylinder 601, and the adjustment piece 612 is substantially screwed with the front outer shaft cylinder 601.

  Further, the rear end of the writing pressure receiving spring 485 is in contact with the front end surface 615 of the adjustment piece 612, and urges the chuck unit 484 forward.

  Next, a method for changing the setting of the forward biasing force of the pen pressure receiving spring in the sixth embodiment of the present invention will be described. A user relatively rotates (twists) the front outer shaft cylinder 601 and the rear outer shaft cylinder 605. At this time, since the spiral crest 614 of the adjustment piece 612 and the spiral groove 604 of the front outer shaft cylinder 601 are substantially screwed together, the adjustment piece 612 tries to rotate together with the front outer shaft cylinder 601. . At the same time, the adjustment piece 612 is inserted into the rectangular groove 608 of the rear outer shaft tube 605 and rotates integrally with the rear outer shaft tube 605.

  That is, the adjustment piece 612 moves along the spiral groove while rotating integrally with the rear outer barrel 605, and thus slides in the front-rear direction of the square groove 608. At this time, since the rear end of the writing pressure receiving spring 485 is in contact with the front end surface 615 of the adjusting piece 612, the writing pressure receiving spring 485 contracts or extends. That is, the forward biasing force of the writing pressure receiving spring 485 changes.

  As described above, the front urging force of the writing pressure receiving spring 485 is appropriately set with respect to the writing pressure that is different for each user, so that the consumption of the core 499 of the user can be extended. The amount can be almost matched.

  In the sixth embodiment, the rear end of the pen pressure receiving spring 485 is in contact with the front outer shaft cylinder 601 and the rear outer shaft cylinder 605 by relatively rotating (twisting) them. The front biasing force of the writing pressure receiving spring 485 can be changed by changing the position of the adjustment piece 612 in the front-rear direction. That is, since the user can easily adjust the forward biasing force of the writing pressure receiving spring 485, the amount of feeding of the lead 499 of the user can be easily matched with the amount of feeding of the lead. This application includes a Japanese patent application filed on July 28, 2010 (Japanese Patent Application No. 2010-169272), a Japanese patent application filed on August 27, 2010 (Japanese Patent Application No. 2010-190213), and a February 28, 2011 application. This is based on a Japanese patent application (Japanese Patent Application No. 2011-041699) filed in Japan, the contents of which are incorporated herein by reference.

101: outer shaft cylinder, 102: joint member, 103: screw portion, 104: screw portion, 105: tip member, 106: through hole, 107: step portion, 108: step portion, 109: step portion, 110: step portion , 111: flat part, 112: screw part, 113: sliding body, 114: inner step part, 115: through hole, 116: step part, 117: groove, 118: apex, 119: core holding member, 120: through hole 121: core protective tube, 122: sliding member, 123: through hole, 124: stepped portion, 125: stepped portion, 126: stepped portion, 127: stepped portion, 128: stepped portion, 129: grooved, 130: grooved 131: Groove, 132: Apex, 133: Rotor, 134: Protrusion, 135: Elastic member, 136: Barbed cylinder, 137: Barb, 138: Barbed cylinder, 139: Inclined cylinder, 140: Inclined surface, 141: chuck, 142: recess, 143: core gripping part, 1 4: ball, 145: bullet member, 146: core, 147: bullet member, 148: cylinder, 149: core tank, 150: rod, 151: bullet member, 152: cylinder, 153: eraser, 154 : Knock member, 155: paper surface, 156: sliding body, 157: groove, 201: outer shaft cylinder, 202: joint member, 203: screw part, 204: screw part, 205: tip member, 206: through hole, 207: Step part, 208: Step part, 209: Step part, 210: Step part, 211: Screw part, 212: Slide body, 213: Inner step part, 214: Through hole, 215: Step part, 216: Groove, 217: Core holding member, 218: through hole, 219: core protection tube, 220: sliding body, 221: through hole, 222: stepped portion, 223: stepped portion, 224: stepped portion, 225: stepped portion, 226: stepped portion, 227: groove, 228: groove, 229: groove, 230: top , 231: cylindrical member, 232: protrusion, 233: flat portion, 234: resilient member, 235: flanged cylinder, 236: flanged cylinder, 237: inclined cylinder, 238: inclined surface, 239: chuck, 240: recess, 241: ball, 242: bullet member, 243: core, 244: bullet member, 245: paper surface, 301: outer shaft cylinder, 302: tip member, 303: hole, 304: slider guide hole , 305: rotation restriction hole, 306: rib, 307: rotor guide hole, 308: fixed cam, 309: slope, 310: fixed cam mountain, 311: fixed cam deep mountain, 312: apex, 313: cam bottom, 314: Cam bottom, 315: tip step, 316: slider, 317: inner step, 318: inner step, 319: moving cam, 320: moving cam peak, 321: moving cam peak, 322: apex, 323 : Outer peripheral step, 324: core Holding member, 325: sliding unit, 326: rotor, 327: projection, 328: front end surface, 329: through hole, 330: core, 331: chuck lid, 332: rear end surface, 333: locking projection, 334 : Locking surface, 335: inclined cylinder, 336: rear collar, 337: inclined inner surface, 338: locking hole, 339: outer periphery, 340: front end surface, 341: rear end knock spring, 342: chuck, 343: Recess, 344: Ball, 345: Cylinder with flange, 346: Front inner step, 347: Back step, 348: Chuck spring, 349: Outer, 350: Chuck unit, 351: Front end surface, 352: Pen pressure receiver Spring, 353: Tip spring, 354: Core receiver, 355: Core tank, 356: Step portion, 357: Intermediate step portion, 358: Rear end knock auxiliary spring, 359: Knock uni 360: Eraser cylinder, 361: Eraser, 362: Knock member, 363: Small diameter part, 364: Clip, 365: Mounting part, 401: Outer cylinder, 402: Tip member, 403: Hole, 404: Sliding Child guide hole, 405: Rotation restriction hole, 406: Guide groove, 407: Sleeve guide hole, 408: Cam, 409: Slope, 410: Valley, 411: Vertex, 412: Rotor guide hole, 413: Front cam, 414 : Front cam crest, 415: Apex, 416: Slope, 417: Rear cam cylinder guide hole, 418: Locking rib, 419: Front step, 420: Slider, 421: Rib, 422: Inner step, 423 : Collar part, 424: core holding member, 425: through hole, 426: sliding unit, 427: sleeve, 428: protrusion, 429: front end surface, 430: stepped hole, 431: stepped part, 432: core feeding unit 433: Rib 434: Back step portion 435: Slider presser 436: Front step portion 437: Rotor 438: Hole 439: Guide groove 440: Back step portion 441: Front cam 442 : Front cam crest, 443: rear cam, 444: rear cam crest, 445: rear end, 446: front end spring, 447: rear cam barrel, 448: locking groove, 449: hole, 450: inclined step, 451 : Inclined surface, 452: stepped portion, 453: rear cam, 454: rear cam mountain, 455: apex, 456: inclined surface, 457: inclined plate, 458: front surface, 458: fulcrum, 460: rear surface, 461: force point, 462 : Working point, 463: Back cam cylinder presser, 464: Front end face, 465: Chuck lid cylinder, 466: Rear end face, 467: Locking projection, 468: Locking face, 469: Inclined cylinder, 470: Back collar , 471: Inclined Surface, 472: locking hole, 473: front end surface, 474: outer periphery, 475: rear end knock spring, 476: chuck, 477: recessed portion, 478: rear stepped portion, 479: outer periphery, 480: ball, 481: flange Cylindrical body, 482: front inner step portion, 483: chuck spring, 484: chuck unit, 485: writing pressure receiving spring, 486: core tank, 487: step portion, 488: rear surface, 489: knock holding portion, 490: step Attached hole, 491: core retaining hole, 492: rear end knock auxiliary spring, 493: tail tube, 494: bottom, 495: hole, 496: eraser, 497: knock, 498: rear step, 499: core, 500: Paper surface, 501: outer shaft cylinder, 502: tip member, 503: hole, 504: slider guide hole, 505: slider holding hole, 506: cam, 507: slope, 508: valley, 5 9: vertex, 510: rotor guide hole, 511: front cam, 512: front cam mountain, 513: vertex, 514: slope, 515: rear cam cylinder guide hole, 516: locking rib, 517: front step, 518: Slider, 519: Engaging groove, 520: Inner step, 521: Rear large diameter part, 522: Core holding member, 523: Through hole, 524: Core feed unit, 525: Projection, 526: Front end face 527: rear step portion, 528: rotor, 529: hole, 530: rib, 531: rear step portion, 532: front cam, 533: front cam mount, 534: rear cam, 535: rear cam mount, 536: Front end spring, 601: Front outer shaft tube, 602: Stepped hole, 603: Stepped portion, 604: Screw groove, 605: Rear outer shaft tube, 606: Outer diameter portion, 607: Engagement shaft portion, 608: Square Groove, 609: buttocks, 610: rear surface, 611: Tsukeana, 612: adjusting piece, 613: engaging rib, 614: spiral mountain, 615: front end face

Claims (7)

In the mechanical pencil in which the chuck unit for preventing the retraction of the lead and the sliding unit having the function of holding the lead are arranged in the shaft cylinder or the tip member,
A sawtooth-like continuous groove is formed on the outer periphery of the sliding unit, and the sliding unit moves back and forth by the rotation of a rotor having a protrusion engaged with the sawtooth-like continuous groove, and the sliding unit. The distance of the back and forth movement is intermittently different,
A mechanical pencil characterized in that the core is extended by applying and releasing the writing pressure multiple times. In the mechanical pencil in which the chuck unit for preventing the retraction of the lead and the sliding unit having the function of holding the lead are arranged in the shaft cylinder or the tip member,
  The sliding unit having a serrated continuous groove formed on its outer periphery rotates and moves back and forth with respect to a cylindrical member having a protrusion that engages with the serrated continuous groove, and the sliding unit moves back and forth. The distance of is intermittently different
  A mechanical pencil characterized in that the core is extended by applying and releasing the writing pressure multiple times. In the mechanical pencil in which the chuck unit for preventing the retraction of the lead and the sliding unit having the function of holding the lead are arranged in the shaft cylinder or the tip member,
A cylindrical member having a plurality of serrated cam ridges radially formed from the axial center in the rear end surface of the sliding unit and the tip member, and having a protrusion engaging with the serrated cam ridge, Rotate and move back and forth by the back and forth movement of the cylinder member, and the distance of the back and forth movement of the cylindrical member is intermittently different
  A mechanical pencil characterized in that the core is extended by applying and releasing the writing pressure multiple times. In the mechanical pencil in which the chuck unit for preventing the retraction of the lead and the sliding unit having the function of holding the lead are arranged in the shaft cylinder or the tip member,
In the shaft tube or the tip member,
  A core feeding unit in which the sliding unit, a sleeve into which the sliding unit is rotatably inserted, and a slider presser disposed integrally with the sleeve are integrally disposed in the axial direction;
  In addition, the rotor and the rear cam cylinder are sequentially arranged,
  A plurality of serrated cam peaks are formed radially from the center of each shaft in the front member and on the front surface of the rear cam of the rear cam cylinder, and the serrated cam peaks engaging with the serrated cam peaks are defined as front end surfaces. The rotor having the rear end surface is rotated and moved back and forth by the back and forth movement of the chuck unit, and the distance of the back and forth movement of the core feeding unit that rotates with the rotor is intermittently varied.
  A mechanical pencil characterized in that the core is extended by applying and releasing the writing pressure multiple times. In the mechanical pencil in which the chuck unit for preventing the retraction of the lead and the lead feeding unit having the function of holding the lead are arranged in the shaft tube or the tip member,
The lead feeding unit includes a slider, a sleeve, a slider presser, and a lead holding member.
In the shaft tube or the tip member,
  A core feed unit in which the slider, the sleeve, and the slider presser are integrated, the core holding member is press-fitted and fixed inside, and is arranged to slide back and forth and rotate;
  In addition, the rotor and the rear cam cylinder are sequentially arranged,
  A plurality of serrated cam peaks are formed radially from the center of each shaft in the front member and on the front surface of the rear cam of the rear cam cylinder, and the serrated cam peaks engaging with the serrated cam peaks are defined as front end surfaces. The rotor having the rear end surface is rotated and moved back and forth by the back and forth movement of the chuck unit, and the distance of the back and forth movement of the core feeding unit that rotates with the rotor is intermittently varied.
  A mechanical pencil characterized in that the core is extended by applying and releasing the writing pressure multiple times. An inclined plate is swingably disposed between the rotor and the chuck unit, and the inclined plate is swung by the back and forth movement of the chuck unit, and the rotor is moved back and forth by the swing of the inclined plate. The mechanical pencil according to claim 4 or 5, wherein the mechanical pencil is rotated . The mechanical pencil according to any one of claims 4 to 6, wherein intermittently moving distances of the lead feeding unit are formed by a slope-shaped cam formed in the tip member .

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