JPH07204363A - Paper cutter - Google Patents

Abstract

PURPOSE:To provide a paper cutter having a lock mechanism which enables locking firmly and with a simplification in mechanism. CONSTITUTION:A spring piece 17 of a paper cutter is locked being mated with a protrusion/recess engaging part and a lock piece 21 is arranged independently on the side of the spring piece 17 to release the locking. A slide mating part 25 is formed at an upper part of the lock piece 21 while a spacer 26 is arranged above the lock piece 21 being allowed to reciprocate in a fixed range. A lock piece fixing part 32 and a lock piece releasing part 33 are formed on the rear of the spacer 26 to make the lock piece 21 move between the locking position and the unlocking position mating with the slide mating part 25 of the lock piece 21 as the spacer 26 shifts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter knife in which a spare blade is slidably housed in a holder and a blade edge is appropriately fed to perform a cutting operation.

[0002]

2. Description of the Related Art In a cutter knife, in order to hold a replacement blade at a predetermined advance position, a recess and protrusion engagement portion is formed in a holder of the replacement blade along the sliding direction of the replacement blade to support the replacement blade. A spring piece that engages with the concave and convex engaging portion is attached to the slide body. And
If you operate the slide body with your finger and slide the spare blade,
The engaging head portion of the spring piece rides over the convex portion of the concave-convex engaging portion by its elastic force, and engages with a predetermined concave portion to hold the replacement blade.

However, in such a replacement blade holding means, when the replacement blade is held at a predetermined advance position and a cutting operation is performed, if a pressing force more than necessary is applied to the tip of the replacement blade, the spring piece presses the pressing force. However, the engaging head of the spring piece rides over the convex portion of the concave-convex engaging portion in the opposite direction to the case of advancing,
This causes a problem that the replacement blade is pushed back. Therefore, it is necessary to lock the spring piece so as not to bend it. As a cutter knife provided with such a lock mechanism, for example, a conventional knife shown in FIGS. 1 to 8 of Japanese Utility Model Application No. 3-224875 can be cited.

[0004]

However, in the lock mechanism of the cutter knife of Japanese Patent Application No. 3-224875, there is an internal return spring 10 as shown in FIG. 8 of the specification.
It is not always easy to assemble because it is mechanically complicated, for example, by disposing. Further, as also shown in FIG. 8 and page 7, lines 7 to 9, the locking spring 2 is locked by the lock portion 9 only by the lock portion 21, so that it is in a locked state when a strong pressure is applied. However, there is a possibility that the locking spring 2 itself bends and becomes in the unlocked state.

It is an object of the present invention to provide a cutter knife which is mechanically simple and has a locking mechanism which can be locked firmly.

[0006]

In order to achieve the above object, in the invention of claim 1, the spare blade is slidably accommodated in a holder, and the spare blade is supported at a base end portion of the spare blade. A spring that holds the replacement blade in a predetermined advance position by mounting the slide body and forming a concavo-convex engagement portion that is continuous in the holder along the sliding direction of the replacement blade and engages with the concavo-convex engagement portion. In a cutter knife in which one piece is attached to the slide body, a lock member that locks the spring piece in an engaged state with the concave-convex engaging portion and releases the lock is provided independently on the side of the spring piece. And an engaging portion is formed on the upper portion of the lock member, and a slide member capable of reciprocating within a certain range is provided above the lock member, and the lock is provided on the back surface of the slide member. Engage with the engaging part of the member With the movement of the member is configured to form a moving means for moving between the locked and unlocked positions of the same locking members.

Further, in the invention of claim 2, in the cutter knife of claim 1, the engaging portion of the lock member is formed with two surfaces obliquely formed with respect to the sliding direction of the slide member. On the other hand, in the moving means of the slide member, another two surfaces corresponding to the two surfaces are formed. Further, in the invention of claim 3, in the cutter knife of claim 1 or 2, the contact surface of the lock member with the spring piece is formed in a shape corresponding to the shape of the back side of the spring piece. Configured. According to a fourth aspect of the invention, there is provided the cutter knife according to the first to third aspects, wherein the slide member is provided with an elastic arm portion and a locking projection protruding from a tip of the arm portion. The locking recess is formed so as to engage itself with the slide body and to hold the lock member immovably.

[0008]

According to the above structure, in the first aspect of the invention, the independently constituted lock member is moved by the moving means to lock the spring piece in the engaged state with the concave and convex engaging portion. The lock mechanism is operated so that the lock is released. According to the second aspect of the present invention, the lock member can be moved in a direction deviated from the sliding direction by forming the surface that is formed obliquely with respect to the sliding direction of the sliding member, and the spring piece in the deviated direction can be moved. The concave-convex engaging portion is locked in the engaged state, and the lock is released.

According to the third aspect of the invention, the abutment surfaces of the lock member and the spring piece match with the back surface of the spring piece to lock the spring piece without a gap, so that the spring piece does not bend. In the invention of claim 4, the arm portion is bent by operating the slide member, and the locking projection is brought into the locked state and the non-locked state with respect to the locking recess of the slide body. . Then, in the locked state, it is fixed to the slide body by itself, and at the same time, the lock member is held immovable as the slide member is fixed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the cutter knife of the present invention will be described below with reference to FIGS. In the following description, the term "front" refers to the left side in FIG. 1 which is the advancing direction of the blade 1, and the term "rear" refers to the right side.

As shown in FIG. 1, a spare blade 1 having creases formed at regular intervals is slidably housed in a holder 2 so that it can be projected and retracted from the tip of the holder 2. The holder 2 is an elongated case formed in a channel shape, and a holder edge portion 3 is formed along an opening opened in the upper longitudinal direction. The holder edge portion 3 is closer to the tip of the holder 2 and the holder edge portion 3 is crushed in the vertical direction to form a withdrawal opening 2a slightly larger than the thickness of the spare blade 1. The wobbling of the spare blade 1 at the tip of the holder 2 is prevented. A cap 4 with a clip is attached to the base end of the holder 2. In FIG. 1, a concave-convex engaging portion 5 is formed on the lower holder edge portion 3. Concavo-convex engaging part 5
Has concavities and convexities continuously formed at the same pitch as the folds of the spare blade 1.

A slide body 6 is attached to the base end of the spare blade 1. The slide body 6 includes a substrate 7 and a lock piece accommodating portion 8 formed on the substrate 7. A pin 6a is formed at the tip of the slide body 6 and is inserted in a locking hole 1a formed near the base end of the spare blade 1. The slide body 6 is slidably accommodated in the holder 2 together with the spare blade 1. Stabilizing ribs 9 that come into contact with the holder edge portion 3 of the holder 2 are formed at four positions on the substrate 7 near the center and the rear side.
Is designed to stabilize when the holder 2 is slid.

The lock piece accommodating portion 8 is surrounded by a wall portion 10 having a substantially rectangular shape in plan view, which is constituted by a long wall portion 10a and a short wall portion 10b. Locking claws 11 are formed outward at four locations on the upper end of the long wall portion 10a and near the short wall portion 10b. In FIG. 2, the long wall portion 10 on the lower side is formed with a notch 12 extending in the entire vertical direction at the longitudinal center thereof. At the position where the notch 12 is formed, an oblong slide recess 13 is formed on the substrate 7 so as to intersect with the notch 12. Long wall 10
First and second V-shaped notches 14 and 15 are formed in the upper part of a and in the front direction of the notch 12 at regular intervals. Inside the upper end of the long wall portion 10a, a slide groove 16 is formed along the long wall portion 10a in a stepwise manner with respect to the upper end.

A spring piece 17 for positioning the slide body 6 with respect to the holder 2 is mounted at the position of the cutout portion 12. The spring piece 17 is an arch-shaped pressing protrusion 18
And a pair of flat shoulder portions 19 formed on both sides of the pressing protrusion 18, and a pair of leg portions 20 extending from the both shoulder portions 19. Both shoulders 19 of the spring piece 17 are on the inner surface of the long wall portion 10a and are brought into contact with the edges of the cutout portion 12, and the pressing projection 18 is projected from the cutout portion 12 to the side of the lock piece storage portion 8. Has been. The pressing protrusion 18 is adapted to engage with the concave-convex engaging portion 5 of the holder edge portion 3.

A lock piece 21 is provided in the slide recess 13.
Are arranged. On the side of the lock piece 21, a mountain-shaped pressing projection 22 corresponding to the concave shape of the back surface of the pressing projection 18 of the spring piece 17 is formed. Flat portions 23 corresponding to the back surfaces of the pair of shoulder portions 19 of the spring piece 17 are formed on both sides of the pressing protrusion 22. The pressing projection 22 and the flat surface portion 23 formed on the lock piece 21 are fitted to the pressing projection 18 of the spring piece 17 and the back surface shapes of the pair of shoulder portions 19 without any gap. Lock piece 21 is spring piece 1
7 is pushed outward from the lock piece accommodating portion 8 side to press the spring piece 17
It is designed to prevent itself from flexing. As a result, the spring piece 17 is attached to the concave-convex engaging portion 5 of the holder edge portion 3.
Will be locked in the state of being engaged with.

A slide rib 21 is provided on the lower surface of the lock piece 21.
a is provided so as to project and guides when the lock piece 21 slides in the slide recess 13 and moves. A step portion 24 is formed on the upper surface of the lock piece 21, and a slide engagement portion 25 is formed in front of the step portion 24. A pair of front and rear slopes 25a having an inclination of 45 degrees with respect to the sliding direction of the slide body 6 are formed in the slide engagement portion 25 in the front and rear.

A spacer 26, which is a slide member, is mounted above the lock piece accommodating portion 8. Spacer 2
Reference numeral 6 is composed of a lock piece fixing plate 27 and a handle 29 on the rear end of which the slip piece 28 is formed. The lock piece fixing plate 27 is placed on the slide groove 16 formed in the long wall portion 10a of the lock piece accommodating portion 8 and slides back and forth. The lock piece fixing plate 27 is a rectangular plate-like body, and an arm portion 30 having elasticity is formed on the front side. At the tip of the arm portion 30, there is formed a locking projection piece 31 which is locked with the first and second V-shaped notches 14 and 15. When the locking projection piece 31 is locked in either the first or second V-shaped notch 14 or 15, the spacer 26 is fixed to the lock piece accommodating portion 8, so that the cutter knife is tilted. However, the spacer 26 does not slide by its own weight.

A lock piece fixing portion 32 and a lock piece releasing portion 33 are formed side by side on the back surface of the lock piece fixing plate 27. At the rear end of the lock piece fixing portion 32, an abutting surface 32a parallel to the front slope 25a of the slide engaging portion 25 is provided.
Is formed, and the contact surface 32a and the slope 25a can contact each other. On the other hand, at the front end of the lock piece releasing portion 33, an abutting surface 33a parallel to the rear slope 25a of the slide engaging portion 25 is formed, and the abutting surface 33a and the slope 25a can come into contact with each other. ing.

That is, as shown in FIG. 4, when the spacer 26 is at the frontmost position and the locking projection 31 of the arm portion 30 is in the locked state with the first V-shaped notch 14, the slide engagement is performed. The front and rear slopes 25a of the portion 25 are in contact with each other between the lock piece fixing portion 32 and the lock piece releasing portion 33. Then, as shown in FIG. 5, when the locking projection piece 31 of the arm portion 30 is located between the first V-shaped notch 14 and the second V-shaped notch 15, the lock piece 21 is replaced by the spring piece 17. The slide engagement portion 25 moves to a position where the lock piece fixing portion 32 and the lock piece releasing portion 33 are just disengaged. In this state, as shown in FIG.
Since a gap is formed on the side (upward in FIG. 6) of the lock piece 21 in the direction of the spring piece 17, the lock piece fixing portion 32 can pass rearward from this gap.

A stopper 34 for preventing the spacer 26 from slipping off is provided on the rear surface of the lock piece fixing plate 27 and behind the lock piece releasing portion 33. The spacer 26
A top plate 35 is mounted above the. The top plate 35 includes a finger hook 36 and a mounting rib 37, and is formed into a plate body having a channel-shaped cross section as a whole. The finger hook 36 is adapted to hook a finger when the cutter knife is used to slide the spare blade 1 and the slide body 6 in the holder 2. An uneven portion 38 for preventing slippage is formed on the surface of the finger hook 36. A positioning piece 39 that corresponds to the cutout portion 12 and presses the spring piece 18 attached to the cutout portion 12 from above is formed on the back surface of the finger hook portion 36. The attachment ribs 37 are formed in an L-shaped cross section, and are erected on both edges of the finger hooks 36 in the longitudinal direction. The mounting rib 37 is the long wall portion 1 of the lock piece accommodating portion 8.
The top plate 35 is fixed to the lock piece accommodating portion 8 by being locked by the locking claw 11 formed on the upper end of the lock piece 0a.

Next, the operation of the cutter knife of this embodiment having the above structure will be described. 1, 2 and 4 show a cutter knife in an unlocked state,
The spare blade 1 can be advanced or retracted by operating the top plate 35. From this state, the handle 2 of the spacer 26
Hold 9 and pull back. Then, the locking projection 31 of the arm portion 30 of the lock piece fixing plate 27 is locked by the arm portion 3.
0 is bent and disengaged from the first V-shaped notch 14 of the lock piece accommodating portion 8, and the locking projection 31 and the first V-shaped notch 14 are disengaged. Then, as the spacer 26 moves backward, the contact surface 32a of the lock piece fixing portion 32 is moved to the slide engaging portion 2
5 comes into contact with the slope 25a on the front side.

Then, the lock piece 21 is fixed to the lock piece fixing portion 3
By being pushed by 2, the two sides 32a and 25a are inclined to move in the direction perpendicular to the sliding direction of the slide body 6 and toward the spring piece 17. As shown in FIG. 5, the locking projection 31 of the arm portion 30 of the lock fixing plate 27
Is located at an intermediate position between the first V-shaped notch 14 and the second V-shaped notch 15, the pressing projection 22 and the flat surface portion 2 of the lock piece 21.
3 is a contact portion 19 of the spring piece 18 and a pair of shoulder portions 2 respectively.
The shape of the back surface of 0 is matched without any gap, and the locked state is achieved. Therefore, even if the top plate 35 is operated, the spare blade 1 cannot be moved back and forth. Of course, even if a pressing force is applied to the tip of the replacement blade 1, the replacement blade will not be pushed back.

When the handle 29 is further grasped and pulled rearward from the state of FIG. 5, the locking projection 31 of the arm portion 30 is locked in the second V-shaped notch 15 of the lock piece accommodating portion 8. Then, the handle 29 of the spacer 26 is also fixed at that position, and even if the cutter knife is tilted, it does not slide and move on the slide groove 16 of the lock piece accommodating portion 8. Therefore, the locked state of the lock piece 21 is not released.

Then, again, the handle 29 of the spacer 26 is gripped and pushed forward. Then, the locking projection piece 31 of the arm portion 30 of the lock piece fixing plate 27 is disengaged from the second V-shaped notch 15 of the lock piece housing portion 8 while bending the arm portion 30,
The spacer 26 is again in the non-fixed state. When the grip 29 is further gripped and pushed forward, the lock piece releasing portion 33 moves forward again so that the contact surface 33a of the lock piece releasing portion 33 comes into contact with the slope 25a on the rear side of the slide engaging portion 25. Become. Then, the lock piece 21 is pushed by the lock piece release portion 33 and moves in a direction orthogonal to the sliding direction of the slide body 6 and away from the spring piece 17 by the action of the inclination of the both surfaces 33a and 25a. Then the lock is released. Then, the locking projection 31 of the arm portion 30 again locks with the first V-shaped notch 14 and returns to the state of FIG.

In the state of FIG. 4, the locking projection 31 of the arm portion 30 of the lock piece fixing plate 27 engages with the first V-shaped notch 14 again, and the spacer 26 is fixed in the unlocked state.

The above-mentioned configuration according to this embodiment has the following effects. (1) As a basic effect, the lock piece 21 can be easily locked to the spring piece 17 by pulling the handle 29 of the spacer 26 rearward. In the locked state, the handle 29 projects rearward from the rear end of the lock piece accommodating portion 8, and conversely, in the unlocked state, the handle 29 is in contact with the rear end of the lock piece accommodating portion 8 as shown in FIG. . Therefore, at first glance, the locked state can be visually recognized, so that a large load is not applied to the tip of the replacement blade 1 in the unlocked state.

(2) Since the lock piece 21 only needs to be arranged in the slide recess 13 of the lock piece accommodating portion 8, the assembling work is simplified. Further, if the lock piece 21 is formed integrally with the lock piece accommodating portion 8 and the spacer 26, the lock piece 21 deteriorates and breaks at the connecting portion due to the concentration of stress due to the repetition of the locked state and the unlocked state. In some cases, However, in this embodiment, since the lock piece 21 is configured separately from the lock piece housing portion 8 and the spacer 26, such a problem does not occur.

(3) The lock piece 21 is locked by the pressing projection 22 and the flat surface portion 23 so as to fit the abutting portion 19 of the spring piece 17 and the back surface shape of the pair of shoulder portions 20 without a gap.
Therefore, even if a large load such that the tip of the spare blade 1 is pushed back into the holder 2 is applied, the spring piece 17 will not be bent at all, and the pressing protrusion 18 of the spring piece 17 will have the concave-convex engaging portion 5.
It does not come off.

(4) The front and rear slopes 25a of the slide engaging portion 25 formed on the upper portion of the lock piece 21 have a contact surface 32a of the lock piece fixing portion 32 and a contact surface 33 of the lock piece releasing portion 33.
It comes into contact with a on an inclined surface. Then, the lock piece 21 is moved to the spring piece 17 by the action of the inclination of each of these surfaces.
And is operated so as to be separated from the spring piece 17. In this way, since the lock piece 21 is moved by the action of the inclined surface, the lock piece 2
The lock piece 21 can be moved extremely smoothly without any trouble such as 1 being caught and stopped during movement. Further, since the inclined surfaces corresponding to each other are brought into surface contact with each other, the pressing forces of the abutting surfaces 32a and 33a on the inclined surface 25a are transmitted on average and without waste, which contributes to a smoother movement of the lock piece 21.

(5) By locking the locking projection 31 of the arm 30 at the front of the lock piece fixing plate 27 to the second V-shaped notch 15, the lock piece 21 can be fixed immovably and the spacer 26 also. Can be fixed. Further, by locking the same locking protrusion 31 in the first V-shaped notch 14, the lock piece 2
The spacer 26 can be fixed in a state where the lock 1 is released. In this way, the lock piece 2 is formed by one member.
1 can be fixed and the lock can be released, and the spacer 26 can also be fixed, so the number of members is reduced,
It is also simple to assemble.

(6) Since the stopper 34 is formed on the back surface of the lock piece fixing plate 27, the spacer 26 does not come out of the lock piece accommodating portion 8 when the spacer 26 slides backward. Further, the positioning piece 39 on the back surface of the top plate 35 serves as an index of the mounting position of the top plate 35, and the spring piece 17 can be pressed from above to prevent the spring piece 17 from rattling or falling off.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and may be configured as follows, for example, without departing from the spirit of the invention.

(1) In both of the above-mentioned embodiments, the lock engaging portion 21 is formed with the slide engaging portion 25.
Alternatively, the pin 40 may be provided on the upper portion of the lock piece 21 as shown in FIG. Even with this structure, the contact surface 32a of the lock piece fixing portion 32 and the contact surface 3 of the lock piece releasing portion 33 are formed.
Since 3a is inclined, the lock piece 21 comes into contact with the spring piece 17 and is operated so as to be separated from the spring piece 17.

(2) The shape of the pressing protrusion 18 of the spring piece 17 is not limited to the above-mentioned embodiment. Also, the shoulder portion 19
The shape of is also the same. With the change of the shapes of the pressing protrusion 18 and the shoulder portion 19 of the spring piece 17, the pressing protrusion 1 of the lock piece 21 is changed.
The shapes of 8 and the plane portion 23 can be changed as appropriate.

In addition, the shape of the handle 29 of the spacer 26, the shape of the finger-holding portion 36 on the surface of the top plate 35, the shape of the uneven portion 38 as a non-slip member, and the like are changed within a normal design changeable range. The present invention is free to be modified and implemented without departing from the spirit of the present invention.

[0036]

As described in detail above, according to the inventions of claims 1 to 4, since it is sufficient to dispose the lock member on the slide body, the assembling work is simplified, and the lock member is mounted on the slide body or the slide body. Since it is configured separately from the member, there is little possibility of causing a problem.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a cutter knife according to the present invention.

FIG. 2 is a side view of a cutter knife in the same embodiment.

FIG. 3 is an exploded perspective view of a cutter knife in the same embodiment.

FIG. 4 is a plan cross-sectional view illustrating an unlocked state, which is a main part of a cutter knife in the same embodiment.

FIG. 5 is a plan sectional view for explaining a locked state, which is a main part of the cutter knife in the same embodiment.

FIG. 6 is a plan cross-sectional view illustrating a main part of a cutter knife in the same embodiment, illustrating a state in which a spacer is further fixed from a locked state.

FIG. 7 is a perspective view illustrating a main part of another embodiment.

[Explanation of Codes] 1 ... Spare blade, 2 ... Holder, 5 ... Concavo-convex engaging portion, 6 ... Slide main body, 17 ... Spring piece, 21 ... Lock piece as lock member, 25a ... Sloping surface, 32 ... Moving means Lock piece fixing portion, 32a, 33a ... Abutting surface that is a surface, 33 ... Lock piece releasing portion that is a moving means.

Claims (4)

[Claims] 1. A replaceable blade is slidably housed in a holder, and a slide body for supporting the replaceable blade is attached to a base end portion of the replaceable blade, and the replaceable blade is attached to the holder along a sliding direction of the replaceable blade. In a cutter knife in which a continuous concave-convex engaging portion is formed and a spring piece that engages with the concave-convex engaging portion and holds the replacement blade at a predetermined advance position is attached to the slide body, Lock the concave and convex engaging parts in the engaged state,
In addition, a lock member for releasing the lock is independently arranged on the side of the spring piece, an engaging portion is formed on the upper portion of the lock member, and reciprocating movement within a certain range is possible above the lock member. A slide member is provided, and the back surface of the slide member is engaged with the engaging portion of the lock member to move the lock member between the lock position and the unlock position as the slide member moves. A cutter knife characterized by forming a moving means. 2. The engaging portion of the lock member has two surfaces that are formed obliquely with respect to the sliding direction of the slide member, while the moving means of the slide member corresponds to the two surfaces. The cutter knife according to claim 1, wherein the other two surfaces are formed. 3. A contact surface between the lock member and the spring piece is
The cutter knife according to claim 1 or 2, wherein the cutter knife is formed in a shape corresponding to the shape of the back side of the spring piece. 4. The slide member is formed with an elastic arm portion and a locking protrusion protruding from the end of the arm portion.
The cutter according to any one of claims 1 to 3, wherein the locking member is immovably held while engaging with a locking recess formed in the slide body to fix itself to the slide body. knife.