JPH06327849A - Autolocking step-slide type cutter knife - Google Patents

Abstract

PURPOSE:To provide a cutter knife equipped with an autolock mechanism in which troublesome lock/release changeover operation can be dispensed with, and whose structure is simple and resistible to a large force. CONSTITUTION:A plate spring member 7 is made up of a nearly semicircularly bent engaging part 71, shoulder parts 72 that have been projected from both ends of the engaging part 71 along the direction in which the edge of a cutter is moved, and leg parts 73 that have been extended from both shoulder parts 72 in the shape of an unfolded fan. An operating member 6 is provided with positioning parts 63a that have been brought into contact with the insides of both leg parts 73 of the plate spring member 7 in the neutral position within the movable range of a slider body 5, and a locking part 63b that has been brought into contact with both the shoulder parts 72 from the antiengaging side in its neutral position for retaining the engaging state of the engaging part 71 with regard to an engaging recessed part 23, while that is separated from either of the shoulder parts 72 in both end positions within the movable range for permitting the separation of the engaging part 71 with regard to the engaging recessed part 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-lock type step slide type cutter knife, and more particularly to an operating member which is inserted into a slide groove of a cutter body in a state of being connected to a cutter blade. The present invention relates to a cutter knife having a mechanism that locks a slider so that it can be moved when the blade is taken in and out, and that the slider does not move when an external force is applied to the blade when the cutter is used.

[0002]

2. Description of the Related Art Conventionally, in a step slide type cutter knife, generally, a cutter blade and a slider, which is a member for operating the cutter blade in and out, are connected in a slide groove of a cutter body. When inserting and removing the blade, the plate held by the slider in the click recess engaging recess that is continuously formed at a constant pitch in the longitudinal direction on the engaging wall provided on the side surface of the slide groove of the cutter body. Part of the spring (engagement portion) is elastically disengaged.

This step slide type cutter knife is generally provided with a mechanism for locking the slider so that the blade is not pushed into the cutter body or pulled out from the cutter body by an external force applied to the blade when the cutter is used. . An example thereof is disclosed in Japanese Utility Model Publication No. 61-35177.

In the cutter knife disclosed in this publication, the slider comprises a slider body, a leaf spring and a lock member. The leaf spring is composed of an engaging portion curved in a substantially semicircular shape and legs extending substantially in a V shape from both ends of the engaging portion, and the locking member is such that the engaging portion of the leaf spring is engaged with the cutter body. A lock position that prohibits displacement from a position engaged with the fitting recess and a lock release position that allows the displacement are settable. For this reason, the blade can be taken in and out by setting the lock member to the unlocked position, and when using the cutter, moving the lock member to the lock position prevents the blade from being pushed into the cutter body or pulled out from the cutter body. There is.

However, in this structure, the position of the lock member has to be changed each time the blade is taken in and out or locked, which is a problem in that the operation is troublesome.

On the other hand, in Japanese Utility Model Laid-Open No. 4-112368, the operation member is formed separately from the slider body, and the operation member is also used as the lock member, so that switching operation between lock and release is performed. A cutter knife that does not require is disclosed. Specifically, the slider
A leaf spring having a slider body, a semi-circularly curved engaging portion and a leg portion that spreads out in a substantially V-shape in the same manner as described above, and movably held in the blade advancing / retreating direction with respect to the slider body. The operating member has a lock portion that holds the engagement portion of the leaf spring engaged with the engaging concave portion of the cutter body when the operating member is in the neutral position in the movable range. A return spring for urging the spring is provided.

In this cutter knife, since the operating member is disengaged from the neutral position when the blade is taken in and out, the lock of the engaging portion with respect to the engaging concave portion is automatically released, and when the hand is released from the operating member, the operating member is neutralized. As it returns to the position, the slider will be locked automatically. In this way, the operating member is formed separately from the slider body,
Moreover, since the operating member also serves as the lock member, the blade can be prevented from being pushed into the cutter body or pulled out from the cutter body during use without troublesome locking operation. However, this configuration requires a return spring, which increases the number of parts and complicates the configuration.

In Japanese Utility Model Publication No. 2-20991,
A cutter knife having a lock mechanism that does not increase the number of parts and does not require a troublesome lock operation is disclosed.

In the cutter knife disclosed in this publication, the slider is composed of a slider body and an operating member which can be displaced relative to the slider body in the cutter blade advancing / retracting direction, and is formed into a substantially V-shaped leaf spring. Alternatively, the central portion of the torsion spring is held by the slider body, and the free ends on both sides thereof are engaged with and disengaged from the engaging recesses of the cutter body. Further, the operating member is usually located between both free ends of the spring, and one free end of the spring is disengaged from the engaging recess when the operating member is moved back and forth with respect to the slider body. A release piece is provided that operates together with the operating member.

With this configuration, when the slider is operated,
Since the operating member moves in the operating direction with respect to the slider body, the free end on the front side in the operating direction is pushed forward and disengaged from the engaging recess. At this time, since the free end on the rear side does not have a lock function for the forward movement, the slider can be operated. On the contrary, when both hands are released from the slider and both free ends are engaged with the engaging recesses, the front free end is stretched into the engaging recesses against the forward movement of the blade, and the backward movement against the backward movement. Since the free end on the rear side is stretched in the engaging recess, the slider is locked with respect to the cutter body.

However, in this cutter, the force applied to the cutter blade during its use acts as a bending load on the spring, so that when a large force is applied, the spring may be deformed and the mechanism portion may be broken.

As described above, in the conventional cutter knife,
While the slider is movable when moving the blade in and out, when a mechanism is provided to prevent the blade from moving when an external force is applied when using the cutter, a troublesome locking operation is unnecessary and the slider structure is simple. It has been extremely difficult to satisfy all the requirements of increasing the strength and achieving sufficient strength. Therefore, the technical problem to be solved by the present invention is to provide a cutter knife which does not require a troublesome locking operation and has an auto-lock mechanism capable of withstanding a large force with a simple structure.

[0013]

SUMMARY OF THE INVENTION An auto-lock type step slide type cutter knife according to the present invention comprises a cutter blade, a cutter body having a slide groove into which the cutter blade is inserted so that the cutter blade can advance and retract, and a slide groove together with the cutter blade. And a slider to be inserted, the cutter body has an engagement wall protruding inward from one side surface of the slide groove, and the engagement wall is formed continuously at predetermined intervals in the cutter blade advancing / retracting direction. A slider body having a fitting recess, a slider body connected to the cutter blade, an operation member movably held in the slider body in the cutter blade advancing / retracting direction, and a leaf spring member held by the slider body. The cutter knife is characterized in that it is configured as described below in order to solve the above technical problems.

That is, the leaf spring member has an engaging portion that is curved in a substantially semicircular shape and engages with the engaging recess, a shoulder portion that extends from both ends of the engaging portion in the cutter blade advancing / retracting direction, and a shoulder portion. And a leg portion that spreads out in a substantially V shape from both ends. And
The operating member makes contact with both the positioning portion that substantially contacts both legs of the leaf spring member from the inside at the neutral position of the movable range with respect to the slider body, and the shoulder portion at the neutral position from the side opposite to the engaging portion, while the operating member has both ends of the movable range. And a lock that is disengaged from one of the shoulders in position.

[0015]

In the above structure, when the engaging portion of the leaf spring member is engaged with the engaging concave portion of the cutter body, the positioning portion is sandwiched by both legs of the leaf spring member, so that the lock portion is Contact with both shoulders. Therefore, even when a force that pushes the blade into the cutter body or a force that pulls the blade out of the cutter body acts when the cutter is used, the shoulder portion is supported from the anti-engagement portion side and the engagement portion. Since the engaged state with the engaging recess is maintained as it is, the movement of the slider is prevented.

On the other hand, if the operating member is pushed in either direction, the positioning part opens the leg part on the front side in the pushing direction and the lock part comes off the shoulder part on the rear side in the pushing direction. Is unlocked. Therefore, when the operating member is further pushed to move the slider body together, the engaging portion of the leaf spring member comes out of the engaging recess and is housed in the adjacent engaging recess.

According to the above construction, since the engaging portion is curved in a semicircular shape, the engaging portion has sufficient strength, and at the time of use, the shoulder portion supports the shoulder portion so as not to come off from the engaging concave portion. Therefore, even if a large force is applied to the blade when using the cutter, the locked state can be reliably maintained, and the lock can be released by simply pushing the operating member back or forth, so switching operation between lock and release is possible. You can operate the blade without taking it in and out. Further, since a member dedicated to the lock is not used, it is possible to prevent the configuration from becoming complicated.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An auto-lock type step slide type cutter knife according to an embodiment of the present invention shown in FIGS. 1 to 6 will be described in detail below.

FIG. 1 is a perspective view of this cutter knife, and FIG.
Is an exploded perspective view, FIG. 3 is an enlarged side view of the slider portion, FIG. 4 is a view showing a cross section taken along line IV-IV of FIG. 3 in a locked state of the slider, and FIG. 5 is a cross section taken along line IV-IV of the slider during operation. FIG. 6 is a view showing a cross section taken along line IV-IV in a state where the slider is unlocked.

In the figure, reference numeral 1 designates a worn cutting edge as a score line 11
A cutter blade that can be broken off along 2 is a cutter body having a slide groove 21 into which the cutter blade 1 is inserted so that the cutter blade 1 can move forward and backward, and 3 is inserted into the slide groove 21 together with the cutter blade 1. It is a slider.

The cutter body 2 is formed by bending a metal plate to have a cross-sectional shape like a lip groove member, and one of the flange portions 22a and 22b is formed as an engaging wall. Engagement recesses 23 are continuously formed in the engagement wall 22a at a constant pitch in the forward / backward direction of the cutter blade 1. A synthetic resin grip 4 is fixed to the cutter body 2 by a method such as insert molding.

The slider 3 is composed of a slider body 5, an operating member 6 and a leaf spring member 7. The slider body 5 is inserted into the slide groove 21 of the cutter body 2, and the bottom wall (not shown) of the groove 21 and the flange portions 22a, 2 are formed.
2b, and a holding portion 52 that projects from the base 51 and holds the operating member 6 and the leaf spring member 7.
It consists of and. The base portion 51 has a protrusion 53 at one end, and the slider body 5 and the cutter blade 1 are connected in the slide groove 21 by inserting the protrusion 53 into the connection hole 12 formed at one end of the cutter blade 1. . Also,
The leaf spring member 7 is held by the slider body 5, and the leaf spring member 7 is elastically engaged with and disengaged from the engagement recess 23 of the engagement wall 22a.

The leaf spring member 7 is formed by bending a single metal leaf spring material, and has an engaging portion 71 that is curved in a substantially semicircular shape, and extends outward from both ends of the engaging portion 71. It integrally has a shoulder portion 72 and a leg portion 73 extending from both ends of the shoulder portion 72 in a substantially V-shape in a direction opposite to the engaging portion 71.

A groove 54 is formed in the slider body 5 to vertically penetrate both the base portion 51 and the holding portion 52. A hole 52b (FIG. 4) is formed in one of the side walls 52a defining the groove 54, and the engaging portion 71 of the leaf spring member 7 is fitted into the hole 52b. In the leaf spring member 7, the engaging portion 71 has a hole 52b in the slider body 5.
When it is fitted in, the part of the engaging portion 71 near the shoulder comes into contact with the edge of the hole 52b, and the end of the leg 73 presses against the inner surface of the opposite side wall 52d, so that the leg 73 The spring force generated at the point of stays in the groove 54.
Further, flange portions 52e and 52f are formed on the upper end of the holding portion 52 of the slider body 5, and a notch 52c is formed in the middle portion of one of the flange portions 52e and 52f.

The operation member 6 has an anti-slip groove 62 on its upper surface.
And a lock piece 63 protruding from the lower surface of the operation portion 61 and inserted into the groove 54 of the slider body 5. Claw portions 61a are formed on both edges of the lower surface of the operation portion 61, and are attached so as to be slidable in the advancing / retracting direction of the cutter blade 1 with the flange portions 52e and 52f of the slider body 5 being sandwiched therebetween. . In addition, a flange portion 52f is provided on the lower surface of the operation portion 61.
A protrusion (not shown) having a width smaller than that of the notch 52c is formed, and the movable range of the operating member 6 is defined by the protrusion and the notch 52c.

On the other hand, the lock piece 63 has a positioning portion 63a (FIG. 4) which comes into contact with both leg portions 73 of the leaf spring member 7 from the inside when the operating member 6 is in the neutral position of the movable range with respect to the slider body 5. The end face is formed in a convex shape in cross section from the lock portion 63b that comes into contact with the shoulder portion 72 of the leaf spring member 73. The end surface of the lock portion 63b is formed so as to come into contact with both shoulder portions 72 when the operating member 6 is in the neutral position, and disengage from one of the shoulder portions 72 at both end positions in the movable range.

In the cutter knife of this embodiment, when the engaging portion 71 of the leaf spring member 7 is engaged with the engaging concave portion 23 of the cutter body 2, the positioning portion 63a has the leg portions 73 of the leaf spring member 7. Therefore, the end surface of the lock portion 63b comes into contact with both of the shoulder portions 72 and receives the engagement portion 71. Therefore, even when a force that pushes the blade 1 into the cutter body 2 or a force that pulls it out from the cutter body 2 act while the paper is being cut by this cutter, the engagement shown in FIG. The engagement state between the portion 71 and the engagement recess 23 is maintained as it is, and the movement of the slider 3 is blocked.

On the other hand, when the blade 1 is taken in and out of the cutter body 2, it can be easily operated by pushing the operating member 6 of the slider 3 in the direction in which the blade 1 is to be moved. For example, when trying to eject the blade 1, the operation member 6 is changed from the state of FIG.
Is pushed toward the left side of the drawing, first, as shown in FIG. 5, the positioning portion 63b opens the left leg portion 73, the end face of the lock portion 63b is disengaged from the right shoulder portion 72, and the engagement recess 23 is engaged. The position regulation of the joint portion 71 is released. When the operating member 6 is further pushed to the left side in the drawing, the protrusion of the operating member 6 is fitted in the notch 52c of the flange 52f of the slider body 5, so that the slider body 5 also starts to operate together. Therefore, the engaging portion 71 of the leaf spring member 7
Moves along the inclined surface of the engaging recess 23 as shown in FIG. Then, when the engaging portion 71 crosses the mountain portion of the engaging concave portion 23, the engaging portion 71 is housed in the adjacent engaging concave portion 23 by the spring force, and the blade 1 is reliably locked by releasing the hand.

As described above, according to this embodiment,
When the blade 1 is used, the blade 1 can be reliably locked, and the blade 1 can be moved in and out one by one by one pitch of the engaging recesses or continuously by simply pushing the operating member 6 forward or backward. Further, since the operating member 6 is also used as the lock member and a member dedicated to the lock is not used, it is possible to prevent the configuration from becoming complicated. Further, since the engaging portion 71 is curved in a semicircular shape, the engaging portion 71 has sufficient strength and supports the shoulder portion 72 so that the engaging portion 71 does not come off from the engaging recess 23 during use. Therefore, even if a large force is applied to the blade during use, the locked state can be reliably maintained.

[Brief description of drawings]

FIG. 1 is a perspective view of an auto-lock type step slide type cutter knife according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of this cutter knife.

FIG. 3 is an enlarged side view of a slider portion of this cutter knife.

FIG. 4 is a view showing a cross section taken along the line IV-IV of FIG. 3 in a locked state of the slider.

5 is a view showing a cross section taken along the line IV-IV of FIG. 3 in a state in which the slider is being operated.

6 is a view showing a cross section taken along line IV-IV of FIG. 3 in a state where a slider is unlocked.

[Explanation of symbols]

1 Cutter Blade 2 Cutter Main Body 3 Slider 4 Grip 5 Slider Main Body 6 Operating Member 7 Leaf Spring Member 11 Marking Line 12 Connecting Hole 21 Sliding Groove 22a Engaging Wall (Flange) 22b Flange Part 23 Engaging Recess 51 51 Base 52 Holding Part 52a Side wall 52b Hole 52c Cutout 52d Side wall 52e, 52f Flange portion 53 Protrusion 54 Groove 61 Operation portion 61a Claw 62 Groove 63 Lock piece 63a Positioning portion 63b Lock portion 71 Engagement portion 72 Shoulder portion 73 Leg portion

Claims (1)

[Claims] 1. A cutter blade (1), a cutter body (2) having a slide groove (21) into which the cutter blade (1) is inserted so that the cutter blade (1) can move forward and backward, and a slide groove (21) together with the cutter blade (1). ), The cutter body (2) is provided with an engagement wall (22a) protruding inward from one side surface of the slide groove (21), and the engagement wall (22a). (22a) comprises engaging recesses (23) continuously formed at a predetermined interval in the cutter blade advancing / retracting direction, the slider (3) is a slider body (5) connected to the cutter blade (1). An auto-locking step including an operating member (6) movably held in the slider body (5) in the cutter blade advancing and retreating direction, and a leaf spring member (7) held by the slider body (5) In the slide type cutter knife, the leaf spring member (7) is curved in a substantially semi-circular shape and engages with the engaging recess (23). ), A shoulder portion (72) protruding from both ends of the engaging portion (71) along the cutter blade advancing and retreating direction, and a leg portion (73) spreading from both ends of the shoulder portion (72) in a substantially V shape. The operating member (6) includes a positioning portion (63a) that is substantially in contact with both leg portions (73) of the leaf spring member (7) from the inside at a neutral position in a movable range with respect to the slider body (5), In the neutral position, both of the shoulders (72) are contacted from the side opposite to the engaging part, and at the both ends of the movable range, a lock part (63b) which is disengaged from one of the shoulders (72) is provided. Characteristic auto-lock type step slide type cutter knife.