JP6552369B2 - cutter - Google Patents

Description

  The present invention relates to a cutter, and more particularly, to a cutter in which a blade is automatically housed in a housing at the end of cutting.

  Conventionally, a cutter is known in which a blade is automatically housed inside a casing when cutting is completed (see, for example, Japanese Patent Application Laid-Open No. 2007-325663). In JP 2007-325663 A, the blade edge of the blade is pushed into the object to be cut, so that the blade itself is slightly rotated in a direction perpendicular to the longitudinal direction of the casing by a reaction force from the object to be cut. The blade is unlocked by the rotation of the blade, and the blade is automatically drawn into the housing when the blade leaves the workpiece.

JP 2007-325663 A

  However, in the conventional cutter described above, when the hardness of the object to be cut is not so high, the reaction force from the object to be cut to the blade is small, and the blade may not rotate sufficiently. In this case, the fixing of the blade cannot be released, and there is a case where the operation of automatically pulling the blade into the housing at the end of cutting cannot be performed.

  Further, in the conventional cutter described above, the blade protruding from the housing is in a state where the entire protruding portion is exposed, and measures to prevent an accident such as the blade being in contact with other members and being damaged are particularly effective. It was not given.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent damage to the blade and to automatically store the blade in the casing reliably at the end of cutting. It is to provide a cutter that can.

  The cutter according to the present invention includes a housing, a blade slider, a guard protection part, an actuator, a first elastic member, and a locking mechanism. The blade slider is disposed inside the housing. The blade slider holds the blade and is movable between a retracted position where the blade is located inside the casing and an extrusion position where at least a part of the blade is located outside the casing. The guard protector is connected to the blade slider and is disposed adjacent to the blade and displaceable with respect to the blade. The actuator is disposed on the outer peripheral side of the housing and is for moving the blade slider from the retracted position to the pushing position. The first elastic member biases the blade slider toward the retracted position. The locking mechanism can be held in a locked state in which the blade slider is positioned at the pushing position by moving the actuator. Further, the locking mechanism is such that when the blade slider is positioned at the push-out position, the guard protection portion comes into contact with the workpiece and is displaced relative to the blade when the workpiece is cut by the blade. As a result, the locked state can be released. The locking mechanism includes an actuator locking portion that protrudes from the surface of the actuator to the inside of the housing, and a guard locking mechanism that is connected to the blade slider and is movable relative to the blade slider in conjunction with the guard protection portion. Including stop portions. When the actuator locking portion presses the guard locking portion from the retracted position side toward the pushing position side, the blade slider is moved to the pushing position. The locking mechanism fixes the position of the actuator locking portion in a state where the actuator locking portion presses the guard locking portion, thereby holding the blade slider in the locked state in which the blade slider is positioned at the pushing position. When the guard protection part is displaced relative to the blade, the locking mechanism moves the guard locking part relative to the actuator locking part in conjunction with the guard protection part. The stop portion is configured to be capable of canceling the state in which the guard engagement portion is pressed.

  According to the present invention, it is possible to obtain a cutter capable of suppressing blade breakage and capable of automatically storing the blade in the housing at the end of cutting.

It is a schematic diagram of the cutter which concerns on Embodiment 1 of this invention. It is an expansion | deployment schematic diagram of the cutter shown in FIG. It is an expansion | deployment schematic diagram of the cutter shown in FIG. It is a schematic diagram for demonstrating operation | movement of the cutter shown in FIG. It is a partial cross-section schematic diagram of the cutter shown in FIG. It is a cross-sectional schematic diagram in line segment VI-VI of FIG. It is a schematic diagram for demonstrating operation | movement of the cutter shown in FIG. It is a partial cross section schematic diagram of the cutter shown in FIG. It is a schematic diagram for demonstrating operation | movement of the cutter shown in FIG. It is a schematic diagram for demonstrating operation | movement of the cutter shown in FIG. It is a schematic diagram for demonstrating operation | movement of the cutter shown in FIG. It is a schematic diagram for demonstrating operation | movement of the cutter shown in FIG. It is a schematic diagram for demonstrating operation | movement of the cutter shown in FIG. It is a schematic diagram for demonstrating operation | movement of the cutter shown in FIG. It is a cross-sectional schematic diagram for demonstrating the modification of the cutter shown in FIG. It is an expansion | deployment schematic diagram of the cutter which concerns on Embodiment 2 of this invention. It is an expansion | deployment schematic diagram of the cutter which concerns on Embodiment 2 of this invention. It is a schematic diagram for demonstrating operation | movement of the cutter shown in FIG. It is an expansion | deployment schematic diagram of the cutter which concerns on Embodiment 3 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

Embodiment 1
<Cutter configuration>
As shown in FIGS. 1 to 3, the cutter 100 according to the present embodiment includes a housing composed of a lower housing 1, an upper housing 2 and a cap 13, a blade 5, a blade slider 6, and a guard protection portion 11. The actuator 7, the first elastic member 4, the locking mechanism, and the second elastic member 8 are mainly provided. The lower housing 1 and the upper housing 2 are overlapped to form a main body, and the blade slider 6 and the like described above are disposed inside the main body. An opening is formed at one end of the main body, and the housing is configured by connecting the cap 13 to the main body so as to close the opening.

  The blade slider 6 is disposed inside the housing. The blade slider 6 holds the blade 5 and is movable between a retracted position where the blade 5 is located inside the casing and an extrusion position where at least a part of the blade 5 is located outside the casing. When the blade slider 6 is in the pushing position, a part of the blade 5 protrudes from the opening formed in the cap 13 to the outside of the housing. The guard protector 11 is connected to the blade slider 6. The guard protector 11 is adjacent to the blade 5 and is displaceable relative to the blade 5. The guard protection portion 11 can be protruded to the outside of the housing together with the blade 5. A guard member from the guard protection part 11, the extension part 3 connected to the guard protection part 11 and extending toward the retracted position, and the guard locking part 9 formed at the end of the extension part 3 on the retracting position side Is configured.

  The guard member is connected to the blade slider 6 at a guard connecting portion 10 formed in the extending portion 3. The guard connection part 10 has an opening. On the blade slider 6, a slider convex portion 14 is formed at a position facing the guard connecting portion 10. The guard member is connected to the blade slider 6 in a state where the slider convex portion 14 is inserted into the opening of the guard coupling portion 10. The guard member is rotatable about the guard connecting portion 10 in the direction along the surface on which the blade 5 of the blade slider 6 is mounted.

  The 1st elastic member 4 is connected to the part adjacent to the guard latching | locking part 9 of a guard member. The first elastic member 4 may be any elastic body, but may be, for example, a coil spring. One end of the first elastic member 4 is connected to a portion of the guard member adjacent to the guard locking portion 9. The other end of the first elastic member 4 opposite to the one end is connected to the housing. The first elastic member 4 biases the guard member and the blade slider 6 to which the guard member is connected from the pushing position side to the drawing position side. In addition, the pushing position side mentioned above is a position on the cap 13 side of the housing, and the retracting position side means a side opposite to the side where the cap 13 is connected in the housing.

  The actuator 7 is disposed on the outer peripheral side of the housing and is for moving the blade slider 6 from the retracted position to the pushing position. A convex actuator locking portion 12 is formed on the inner peripheral surface of the actuator 7 facing the housing. The actuator 7 is attached to the outer surface of the casing so that the actuator locking portion 12 protrudes into the casing. Further, on the inner peripheral surface of the actuator 7, a convex portion for fixing the elastic member is formed. One end of the second elastic member 8 is fixed to the convex portion. The other end opposite to one end of the second elastic member 8 is fixed to the housing. The second elastic member 8 can be any elastic body, but may be a coil spring, for example.

  The actuator locking portion 12 can contact the guard locking portion 9 from the retracted position side inside the housing. That is, by moving the actuator 7 from the retracted position side to the pushing position side, the actuator locking portion 12 presses the guard locking portion 9 and the guard member and the blade slider 6 can be moved to the pushing position side.

  The locking mechanism includes an actuator locking portion 12 and a guard locking portion 9. By moving the actuator 7 by the locking mechanism, the blade slider 6 can be held in the locked state positioned at the pushing position as described above. Further, the locking mechanism is configured such that when the blade slider 6 is in the pushing position and the blade 5 cuts the workpiece, the guard protection portion 11 comes into contact with the workpiece and is relative to the blade 5. Displace. Due to such displacement (rotation) of the guard protection part 11, the guard locking part 9 also rotates around the guard connection part 10. As a result, the guard locking portion 9 moves to a position not in contact with the actuator locking portion 12. As a result, the guard member can be moved to the retracted position side by the tensile force of the first elastic member 4. That is, the locked state of the blade slider 6 can be released according to the displacement of the guard protection part 11. Details of the operation of the cutter will be described later.

<Cutter operation>
The operation of the cutter will be described with reference to FIGS.

(1) Protrusion Operation of Blade As shown in FIG. 4 and FIG. 5, the user of the cutter moves the actuator 7 from the retracted position side to the extrusion position side in the direction shown by the arrow 27. As a result, the actuator locking portion 12 moves in the direction indicated by the arrow 21 while pressing the guard locking portion 9 as shown in FIG. For this reason, the blade 5 held by the blade slider 6 and the guard protection portion 11 of the guard member are in a state of protruding to the outside of the casing. In addition, the guard protection part 11 is arrange | positioned in the position adjacent to the braid | blade 5 as shown in FIG. Further, the guard protection portion 11 is disposed so as to extend to the outside of a portion to be a cutting edge in the blade 5 (an end portion forming an acute angle on the lower side in FIG. 56). In this way, it is possible to reduce the possibility that the cutting edge of the blade 5 mistakenly contacts other members.

(2) Cutting As shown in FIGS. 7 and 8, when the user of the cutter starts cutting the object, a part of the cutting edge of the blade 5 is cut into the surface 22 of the object. On the other hand, the guard protection portion 11 is displaced in the direction indicated by the arrow 23 by contacting the surface 22. As a result, the guard member rotationally moves about the guard connecting portion 10. Therefore, the guard locking portion 9 is displaced in the direction indicated by the arrow 24. In this way, the guard locking portion 9 is detached from the actuator locking portion 12. At this time, since the blade 5 is in a state of biting into the surface 22 of the object to be cut, the blade 5 and the guard protecting portion 11 do not move the guard member, the blade slider 6 and the blade 5 to the retracted position side. The protruding state from the housing is maintained.

(3) End of cutting As shown in FIGS. 9 and 10, when the blade is separated from the object to be cut and the blade 5 is held by the first elastic member 4 (see FIG. 2), the blade slider 6 is held. And the guard member are drawn in the direction indicated by the arrow 25, that is, the drawing position inside the housing. At this time, as shown in FIG. 8, since the guard locking portion 9 is detached from the actuator locking portion 12 at the time of cutting, the guard locking portion 9 is also an actuator as shown by an arrow 26 in FIG. It can be moved to the retracted position side through the side of the locking portion 12. When the guard locking portion 9 is sufficiently pulled into the interior of the housing as shown in FIG. 10 through the side of the actuator locking portion 12, the force from the first elastic member 4 causes the guard locking portion 9 to move. Moves in the direction indicated by arrow 28. At the same time, the guard protector 11 moves in the direction indicated by the arrow 27. That is, the guard engagement portion 9 and the guard protection portion 11 return to the initial position.

(4) Actuator return As shown in FIG. 11 to FIG. 14, when the user stops holding the actuator 7 after the cutting is finished and the blade 5 and the guard protector 11 are housed in the housing, The actuator 7 is pulled and moved by the second elastic member 8 toward the retracted position. Here, the guard locking portion 9 includes a first inclined surface 15 which is inclined with respect to the direction from the pull-in position to the extrusion position. That is, the planar shape of the guard locking portion 9 is a triangular shape having a vertex on the blade 5 side. Further, the actuator locking portion 12 has a second inclined surface 16 extending in a direction along the first inclined surface 15 of the guard locking portion 9. Therefore, when the actuator 7 moves in the direction shown by the arrow 29 as shown in FIG. 11 to return to the position of the initial state, the second inclined surface 16 of the actuator locking portion 12 is the first tilt of the guard locking portion 9 Contact surface 15. Then, as the actuator locking portion 12 moves in the direction shown by the arrow 29, the guard locking portion 9 is pushed by the actuator locking portion 12 and thereby moves in the direction shown by the arrow 30. For this reason, while the actuator locking portion 12 moves, the guard locking portion 9 is displaced so as to deviate from the actuator locking portion 12, and as shown in FIGS. 12 and 13, the actuator locking portion 12 is a guard engagement member. The position of the stop 9 can be passed. Thereafter, as shown by an arrow 31 in FIG. 13, the guard locking portion 9 returns to the original position by the tensile force from the first elastic member 4. In this manner, as shown in FIG. 14, the guard locking portion 9 can be returned to the initial state, that is, the contact state by the actuator locking portion 12 from the pull-in position side.

<Operation effect of cutter>
Hereinafter, although there is a part which overlaps with the description mentioned above, the characteristic structure and effect of the cutter mentioned above are demonstrated.

  As described above, the cutter according to the present embodiment includes the locking mechanism including the actuator locking portion 12 and the guard locking portion 9, and the locking mechanism moves the actuator 7 to move the blade slider. 6 can be held in the locked state in which it is located at the pushing position. Further, the locking mechanism is configured such that when the blade slider 6 is in the pushing position and the blade 5 cuts the workpiece, the guard protection portion 11 comes into contact with the workpiece and is relative to the blade 5. Due to the displacement, the locked state can be released.

  In this way, the guard protector 11 comes into contact with the surface 22 of the object to be cut when the blade 5 is cut into the object to be cut. The protection part 11 is easily displaced with respect to the blade 5. Since the blade slider 6 is released from the locked state due to the displacement of the guard protecting portion 11, the blade slider that holds the blade 5 at the end of cutting, that is, when the blade 5 leaves the surface 22 of the workpiece. 6 is pulled into the interior of the housing by the first elastic member 4 and returns to the retracted position. Thus, the blade 5 can be reliably pulled into the inside of the housing at the end of cutting.

  Further, since the guard protection unit 11 is disposed adjacent to the blade 5, the blade 5 can be protected by the guard protection unit 11. For this reason, it is possible to suppress the occurrence of a problem that the blade 5 is in direct contact with another member and is broken.

  In the cutter, the actuator locking portion 12 may protrude from the surface of the actuator 7 into the housing. The guard locking portion 9 may be connected to the blade slider 6 and movable relative to the blade slider 6 in conjunction with the guard protection portion 11. The blade slider 6 may be moved to the pushing position by the actuator latching portion 12 pressing the guard latching portion 9 from the retracted position side toward the pushing position side. The locking mechanism can hold the blade slider 6 in the locked state by fixing the position of the actuator locking portion 12 with the actuator locking portion 12 pressing the guard locking portion 9. As shown in FIGS. 7 and 8, when the guard protection part 11 is displaced relative to the blade 5, the locking mechanism interlocks with the guard protection part 11 so that the guard locking part 9 is an actuator locking part. By moving relatively with respect to 12, the state in which the actuator locking portion 12 presses the guard locking portion 9 can be eliminated.

  In this case, as shown in FIG. 8, the cutting is completed as described above with a relatively simple configuration in which the engagement between the guard locking portion 9 and the actuator locking portion 12 is released according to the displacement of the guard protection portion 11. Sometimes the blade 5 can be reliably pulled into the housing.

  In the cutter, the guard locking portion 9 is disposed at the end portion on the retracting position side in the extending portion 3 extending from the guard protecting portion 11 to the retracting position side as shown in FIG. In the extension portion 3, the guard protection portion 11 is movably connected to the blade slider 6. Specifically, the guard protection part 11 may be connected to the blade slider 6 via the guard coupling part 10 of the extension part 3.

  In this case, the guard protection part 11 and the guard locking part 9 are arranged on the opposite sides when viewed from the guard coupling part 10 which is a connection part to the blade slider 6 in the extension part 3. If it says from a different viewpoint, the guard protection part 11 will be located in the extrusion position side seeing from the said connection part, and the guard locking part 9 will be located in the drawing position side seeing from the said connection part. Therefore, for example, if the extending portion 3 is rotatable in a plane along the main surface of the blade slider 6 (surface holding the blade 5) in the connection portion, the arrow 23 ( The guard locking portion 9 can be easily displaced in the direction opposite to the direction shown in FIG. 8 (the direction shown by the arrow 24 in FIG. 8).

  In the cutter, the guard locking portion 9 may include a first inclined surface 15 (see FIG. 11) whose surface on the extrusion position side is inclined with respect to the direction from the retracted position toward the extrusion position. The actuator engaging portion 12 may include a second inclined surface 16 along the first inclined surface 15 on the surface on the retracted position side.

  Here, when the blade slider 6 is pulled into the housing at the end of the cutting and disposed at the retracted position, the actuator 7 remains in the state when the blade slider 6 is pushed out to the pushing position. In other words, in this case, the actuator locking portion 12 is arranged on the push-out position side of the guard locking portion 9 as shown in FIG. From this state, in order to return the actuator 7 to the initial state (the state before the blade slider 6 is pushed out from the retracted position to the pushing position), the actuator locking portion 12 must move from the guard locking portion 9 to the retracted position side. I must. Thus, when the actuator locking part 12 moves from the pushing position side to the retracting position side, the second inclined surface 16 of the actuator locking part 12 comes into contact with the first inclined surface 15 of the guard locking part 9, and the guard The locking part 9 is pressed. And since the guard latching | locking part 9 pressed in this way is movable, it is displaced so that the actuator latching | locking part 12 may be avoided as shown in FIG.11 and FIG.12. Therefore, the actuator locking part 12 can move to the retracted position side from the guard locking part 9. As a result, the actuator 7 can be returned to the initial state.

  The cutter further includes a second elastic member 8 that biases the actuator 7 toward the retracted position. In this case, the actuator 7 can be easily returned to the initial state by the second elastic member 8.

<Modification of cutter>
FIG. 15 is a schematic cross-sectional view for explaining a modification of the cutter shown in FIGS. 1 to 14 and corresponds to FIG. The cutter shown in FIG. 15 basically has the same configuration as the cutter shown in FIGS. 1 to 14, but the shape of the guard protection portion 11 is different from the cutter shown in FIGS. That is, the cutter shown in FIG. 15 is arranged so that the guard protection portion 11 surrounds the three sides of the blade 5. From a different point of view, the guard protection portion 11 shown in FIG. 15 is disposed so as to cover the surface of the blade 5 from three directions other than the cutting edge side of the blade 5. With such a configuration, the same effect as the cutter shown in FIGS. 1 to 14 can be obtained. Furthermore, since almost the entire blade 5 is covered by the guard protection portion 11, the probability of occurrence of a problem such as the blade 5 accidentally contacting another member can be further reduced.

Second Embodiment
The cutter concerning this embodiment is shown in FIG. 16 and FIG. The cutter shown in FIGS. 16 and 17 basically has the same configuration as the cutter shown in FIGS. 1 to 14, but the connection structure between the guard member including the guard protection portion 11 and the blade slider 6 is as shown in FIG. This is different from the cutter shown in FIG. That is, in the cutter shown in FIGS. 16 and 17, a plurality of guard connecting portions 10 are formed in the extending portion 3 of the guard member. The guard connection part 10 is a convex part which protrudes to the blade slider 6 side. Although the planar shape of the guard connection part 10 can be made into arbitrary shapes, it is circular, for example. The blade slider 6 is formed with a recess 41 for inserting the two guard connecting portions 10 respectively. The plurality of recesses 41 are disposed at positions facing the guard connection portion 10. The recess 41 may be an elongated hole having a major axis in a direction intersecting with the extending direction of the extending portion 3, for example, in a direction orthogonal to the extending direction of the extending portion 3. In addition, the guard connection part 10 and the recessed part 41 may be formed three or more.

  In the cutter having such a configuration, the guard protection part 11 is displaced in the direction indicated by the arrow 32 as shown in FIG. That is, the guard protection portion 11 moves in parallel in the direction along the long axis of the recess 41 described above. Even in this case, the guard locking part 9 is displaced with the movement of the guard protection part 11, and the state where the guard locking part 9 is detached from the actuator locking part 12 as shown in FIG. 8 can be realized. As a result, like the cutter shown in FIGS. 1 to 14, the blade 5 can be automatically accommodated in the housing after the end of cutting.

Third Embodiment
The cutter which concerns on this embodiment is shown in FIG. FIG. 19 is a developed schematic view of a cutter according to the present embodiment, corresponding to FIG.

  The cutter shown in FIG. 19 basically has the same configuration as the cutter shown in FIGS. 1 to 14, except that the second elastic member for returning the actuator 7 to the initial state is not disposed. It differs from the cutter shown in FIGS. Also with the cutter having such a configuration, basically, the same effect as the cutter shown in FIGS. 1 to 14 can be obtained. Moreover, since the second elastic member is not disposed, the number of parts of the cutter can be reduced, and the manufacturing cost can be reduced. In order to return the actuator 7 to the initial state, for example, the user of the cutter performs an operation of moving the actuator 7 to the pull-in position side.

  Moreover, in the cutter of each embodiment mentioned above, arbitrary materials, such as a resin material, can be used for the material of the guard protection part 11. FIG. Moreover, you may comprise the guard protection part 11 with a transparent material or a translucent material. In this way, when the blade 5 is aligned with the cut portion of the workpiece, the position of the blade 5 can be easily confirmed, and workability can be improved.

  Although the embodiment of the present invention has been described above, the above-described embodiment can be variously modified. The scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The invention is particularly advantageously applied to a safety cutter in which the blade is automatically housed inside the housing.

  DESCRIPTION OF SYMBOLS 1 Lower housing, 2 Upper housing, 3 Extension part, 4 1st elastic member, 5 Blade, 6 Blade slider, 7 Actuator, 8 2nd elastic member, 9 Guard locking part, 10 Guard connection part, 11 Guard protection part , 12 Actuator locking portion, 13 Cap, 14 Slider convex portion, 15 First inclined surface, 16 Second inclined surface, 21, 23-32 Arrow, 22 Surface, 41 Recessed portion, 100 Cutter.

Claims (4)

And
It is disposed inside the housing and holds a blade, and between a retracted position where the blade is located inside the housing and an extrusion position where at least a part of the blade is located outside the housing A movable blade slider;
A guard protector connected to the blade slider, adjacent to the blade and disposed displaceably with respect to the blade;
An actuator disposed on the outer peripheral side of the housing for moving the blade slider from the retracted position to the pushing position;
A first elastic member urging the blade slider toward the retracted position;
By moving the actuator, the blade slider can be held in the locked state positioned at the push-out position, and the workpiece is cut by the blade while the blade slider is located at the push-out position. And a locking mechanism capable of releasing the locked state due to the guard protection portion coming into contact with the workpiece and being displaced relative to the blade at the time of
The locking mechanism is
An actuator locking portion projecting from the surface of the actuator into the interior of the housing;
A guard locking portion connected to the blade slider and movable relative to the blade slider in conjunction with the guard protection portion;
The blade slider is moved to the push-out position by the actuator lock portion pressing the guard lock portion from the pull-in position toward the push-out position.
The locking mechanism is in a locked state in which the blade slider is positioned at the push-out position by fixing the position of the actuator locking portion in a state where the actuator locking portion presses the guard locking portion. Hold and
The locking mechanism moves the guard locking portion relative to the actuator locking portion in conjunction with the guard protecting portion when the guard protecting portion is displaced relative to the blade. By doing, the cutter is comprised so that cancellation | release of the state which the said actuator latching | locking part pressed the said guard latching | locking part is possible. The guard locking portion is disposed at an end portion on the pull-in position side in an extension portion extending from the guard protection portion to the pull-in position side,
The cutter according to claim 1, wherein the guard protecting portion is connected to the blade slider so as to be displaceable in the extending portion. The guard locking portion includes a first inclined surface whose surface on the side of the extrusion position is inclined with respect to a direction from the retracted position toward the extrusion position,
The cutter according to claim 1 or 2, wherein the actuator locking portion has a second inclined surface along the first inclined surface, the surface on the retracted position side.   The cutter according to any one of claims 1 to 3, further comprising a second elastic member that biases the actuator toward the retracted position.

Images