JP2003265873A - Blade-replaceable retractable knife - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade-replaceable retractable knife that can easily replace a blade by just inserting or drawing off only the blade from the tip of a body (blade holder). <P>SOLUTION: A strip-shaped blade 1 with a hooking hole 12 on the back end part is hooked on an operating member 3 that moves it forward and backward and stored into a blade holder 2 provided with an opening part 22 along one side in the longitudinal direction and coupling clogs 23 placed along the edge part 22a at a specific pitch. The operating member 3 is located between a tab 31 that has a shoulder part 31a that is abut against the inserting end of the blade 1 and the back sides of a push button 32 and the tab 31 in a way that it clips the coupling clogs 23. It is comprised of a pressure plate 33 and a leaf spring 34 that constantly depresses the pressure plate 33 in the direction of the coupling clogs 23 and the pressure plate 33 is provided with a claw 35 that hooks on the coupling clogs 23 and a hooking prong 36 that hooks on the hooking hole 12 of the blade 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a replaceable blade type cutter knife that is used by moving a blade tip portion out of a handshake portion.

[0002]

2. Description of the Related Art Generally, a replaceable blade type cutter knife of this type is formed so that a strip-shaped blade is slidably inserted into an elongated body and a feeding knob provided on a side surface is moved forward to extend the blade. There is. And in the past, when replacing a blade that is no longer used and used with a new one, after removing the stop cover at the rear end of the main unit, pull out the blade with the feeding knob and set a new blade on the feeding knob, and with the feeding knob. It has a structure in which the blade is inserted into the main body and attached.

[0003]

However, when the blade is replaced, the above-mentioned operation of removing the stop cover,
It is necessary to pull out the feeding knob from the main body to the rear side and set the blade on the feeding knob, and again to insert the feeding knob with the blade into the main body with the feeding knob set and attach the stop cover. The replacement operation is very troublesome, and when the feeding knob is removed together with the blade,
Alternatively, when the blade is inserted into the main body in a set state, the blade may be separated and dropped, or the stop cover may be lost, which is more complicated.

Therefore, the present invention provides a cutter knife having a function of easily attaching and detaching the blade only by inserting or withdrawing the blade from the tip side of the main body (blade holder). Its main purpose is to solve problems.

Still another object of the present invention is to easily insert the blade into the main body (blade holder), but the blade tip portion of the inserted blade is held without rattling with respect to the main body, which enables precise cutting. It is to provide a replacement blade type cutter knife suitable for processing.

[0006]

In order to achieve the above object, the present invention takes the following technical means. That is, in the cutter knife according to the present invention, the strip-shaped blade 1 having the engagement hole 12 at the rear end portion in the lengthwise direction, and the blade 1 are housed so that they can be taken in and out through the inlet / outlet port 21 and one side surface. Blade holder 2 having an opening 22 extending in the longitudinal direction, and meshing teeth 23 provided at a predetermined pitch on opposite edges 22a of the opening 22.
And an operating member 3 for moving the blade 1 forward and backward
And the operating member 3 includes the blade holder 2
Step portion 31 that is attached so as to be slidable along the opening portion 22 of the blade 1 and that abuts the insertion end of the blade 1.
a knob portion 31 provided with a, a push button 32 provided on the knob portion 31, and a rear surface of the knob portion 31 are arranged so as to sandwich the meshing teeth 23 of the opening portion 22,
Further, it is composed of a crimping plate 33 integrally connected to the rear end of the push button 32, and a leaf spring 34 attached to the rear end of the push button 32 and constantly pressing the crimping plate 33 toward the meshing teeth 23. The pressing plate 33 is provided with a claw 35 that engages with the meshing tooth 23 and an engagement protrusion 36 that engages with the engagement hole 12 of the blade 1, and the push button 32 is resistant to the leaf spring 34. When pressed, the claw 35 is disengaged from the meshing tooth 23 to allow the operation member 3 to slide, and the blade 1 is moved to the most distal position.
It is configured so that it can be attached and detached by inserting and removing.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In carrying out the cutter knife according to the present invention having the above-mentioned structure, it is formed on a part of the leaf spring 34 when the operating member 3 is moved to a set position near the tip of the blade holder 2. It is preferable that the engaging portion 34a is detachably fitted into the fitting hole 24 formed in the blade holder 2 so that the movement of the operation member 3 can be stopped.

Further, in the present invention, a plate-like gap element 5 for filling a gap with the blade is swingably attached to the blade inlet / outlet port 21 of the blade holder 2 with the vertical pivot 51 as a fulcrum, and the gap element 5 is In a plan view, the blade has an inclined surface 52 in which the gap between the blade insertion / removal ports 21 becomes wider toward the tip, and the inclined rear end forms a substantial cam 53, and the insertion tip end abuts on the cam 53 when the blade is inserted. It may be implemented as a structure in which 52 is configured to rotate so as to come into contact with the blade 1. In this case, when the blade is inserted, the gap of the blade inlet / outlet port 21 is widened so that it is easy to insert the blade. When the insertion tip portion of the blade hits the cam 53 in the insertion process, the spacer 5 rotates and the inclined surface 52. Makes contact with the side surface of the blade, which can reliably prevent rattling of the insertion portion of the blade.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIGS. 1 to 6 show a typical embodiment of a replaceable blade type cutter knife according to the present invention, in which a blade denoted by reference numeral 1 has a predetermined pitch along the length direction. It is formed of a strip-shaped metal plate having a large number of cutting lines 11 ... And having an engaging hole 12 at the rear end. The blade holder 2 into which the blade 1 is inserted is for accommodating the blade 1 so that it can be taken in and out through an inlet / outlet opening 21 formed on the left side in FIG. 2, and has a C-shaped cross section in a longitudinal direction on one side. There is an opening 22 extending along. The opening 22 has a shape in which meshing teeth 23 are provided at a predetermined pitch on the opposite edge portions 22a.

An operating member 3 for advancing and retracting the blade 1 is attached to the blade holder 2 so as to be slidable along the opening 22 of the blade holder 2 and is in contact with the insertion end of the blade 1. The knob portion 31 having the portion 31a, the push button 32 provided on the knob portion 31, and the rear surface of the knob portion 31 are arranged so as to sandwich the meshing tooth 23 of the opening portion 22 and the push button. It is composed of a crimping plate 33 integrally connected to the rear end of the button 32, and a leaf spring 34 attached to the rear end of the push button 32 and constantly pressing the crimping plate 33 toward the meshing teeth 23. . The crimp plate 3
3 and the leaf spring 34 are push buttons 3 with screws 37.
It is screwed to 2.

The crimping plate 33 has a projection-shaped claw 35 that engages with the meshing tooth 23 formed on the blade holder 2 and the engagement hole 1 formed on the blade 1.
2 and an engaging projection 36 that engages with 2. As shown in FIG. 4, the push button 32 is pressed against the leaf spring 34.
When is pressed, the claw 35 disengages the meshing teeth 23 to allow the operation member 3 to slide, and at the most distal position, the blade 1 can be inserted and removed for replacement of the blade. Has been formed. The engagement and disengagement of the engagement hole 12 of the blade 1 with the engagement protrusion 36 is performed by the blade 1
The insertion end is positioned so as to contact the stepped portion 31a of the knob portion 31.

That is, according to the present invention, as shown in FIG. 4, when the operating member 3 moves to the set position near the tip of the blade holder 2, the engaging portion 3 formed in a part of the leaf spring 34.
4a is removably fitted into a fitting hole 24 formed in the blade holder 2 to stop the movement of the operation member 3, and the engagement protrusion 36 is formed so as to be disengaged from the engagement hole 12 of the blade 1. There is. With such a structure, the blade 1 can be easily removed by pulling the blade 1 in the pull-out direction while pressing the push button 32. On the contrary, by pushing the push button 32, the blade 1 is inserted from the inlet / outlet opening 21 until it abuts the step portion 31a, and the pressing force of the push button 32 is released. Hole 12
Matches with and the blade can be easily attached.

Further, a plate-shaped gap element 5 for filling a gap with the blade 1 is attached to the blade inlet / outlet port 21 of the blade holder 2 so as to be swingable about a vertical pivot 51. As shown in detail in FIGS. 5 and 6, the gap element 5 is provided with an inclined surface 52 in which the gap of the blade insertion / removal opening 21 becomes wider toward the tip portion in its planar shape,
The inclined rear end portion substantially forms a cam 53, and when the blade is inserted, the insertion tip end portion of the blade 1 hits the cam 53 and is rotated so that the inclined surface 52 is in contact with the side surface of the blade 1. As a result, when the blade is inserted, the gap of the blade insertion / removal opening 21 is wide and it is easy to insert, and when the blade is inserted, the blade tip portion hits the cam 53 and rotates, and the inclined surface 52 makes contact with the blade side surface. It is possible to reliably prevent rattling.

Although the representative embodiments of the present invention have been described above, the present invention is not necessarily limited to the structures of the above-mentioned embodiments, but is within the scope of having the constituent features of the present invention and being effective. Of course, it can be implemented by appropriately changing it.

[0015]

Since the replaceable blade type cutter knife of the present invention is constructed as described above, by operating the push button, only the blade can be easily attached or removed from the blade insertion / extraction opening at the tip. Therefore, it is not necessary to take out the operating member (corresponding to a conventional operating knob) together with the blade from the rear end side as in the conventional case, and there is a remarkable effect that the cutter knife can be replaced very easily.

Further, by having the structure of claim 3,
When inserting the blade, it is easy to insert because the gap of the blade insertion / extraction opening can be widened, and the cam contacts the blade tip portion in the insertion process to rotate the gap element, and the inclined surface of this is brought into contact with the blade side surface and It has an excellent effect of reliably preventing rattling of the tip portion.

[Brief description of drawings]

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

FIG. 2 is a perspective view of the cutter knife.

FIG. 3 is a cross-sectional view of the cutter knife.

FIG. 4 is a sectional view similar to FIG. 4, showing a state in which the push button is pushed down at a position where the operation member has moved in the distal direction.

FIG. 5 is a cross-sectional view of a spacer portion according to the present invention, showing a posture before a blade is inserted.

FIG. 6 is a sectional view similar to FIG. 5, showing a posture when a blade is inserted.

[Explanation of symbols]

1 blade 11 cutting line 12 Engagement hole Feed hole 2 blade holder 21 Blade entrance / exit 22 opening 22a Edge of opening 23 teeth 3 operation members 31 knob 32 push buttons 33 Crimping plate 34 leaf spring 34a engaging part 35 nails 36 Engagement protrusion 4 cover body 5 Gap 51 vertical axis 52 Inclined surface 53 cam

Claims (3)

[Claims] 1. A strip-shaped blade (1) having an engaging hole (12) at a rear end portion in a length direction, and an inlet / outlet opening (21) for the blade (1).
It is housed so that it can be taken in and out, and an opening (22) is provided on one side surface that extends along the lengthwise direction, and the opening (22) is provided.
On the opposite edges (22a) of (22), meshing teeth (2
3) provided with a blade holder (2), the blade
(1) consists of an operating member (3) for moving forward and backward, the operating member (3) is the opening (2) of the blade holder (2).
Mounted so that it can slide along 2), and
A knob portion (31) provided with a step portion (31a) that comes into contact with the insertion end of the blade (1), a push button (32) provided on the knob portion (31), and the knob portion (31) Opening between back side
A crimping plate (33) which is arranged so as to sandwich the meshing teeth (23) of (22), and is integrally coupled to the rear end of the push button (32),
A leaf spring (3) is attached to the rear end of the push button (32) and constantly presses the crimping plate (33) toward the meshing teeth (23).
4) and the crimping plate (33) has meshing teeth.
The push button (32) is provided with a claw (35) that engages with (23) and an engagement protrusion (36) that engages with the engagement hole (12) of the blade (1).
When pressing against the leaf spring (34), the pawl (35)
A replaceable blade type knife which is formed so that the operation member (3) can be slid out of engagement with (3) and that the blade 1 can be attached / detached by being inserted / removed at the most advanced position. 2. The blade holder (2) for the operating member (3)
The engaging portion (34a) formed in a part of the leaf spring (34) is removably fitted into the fitting hole (24) formed in the blade holder (2) when moved to the vicinity of the tip of The replaceable blade type cutter knife according to claim 1, which is formed so that the movement of the operation member (3) can be stopped. 3. A plate-like spacer for filling a gap between the blade holder (2) and the blade insertion / removal opening (21) with the blade.
(5) is attached so that it can swing about a vertical pivot (51) as a fulcrum, and in the planer shape, the gap (5) has an inclined surface (5) in which the clearance of the blade inlet / outlet port (21) becomes wider toward the tip.
2), the inclined rear end portion of which substantially forms the cam (53) so that the insertion tip portion hits the cam (53) when the blade is inserted so that the inclined surface (52) is in contact with the side surface of the blade (1). The blade cutter knife according to claim 1 or 2, which is configured to rotate.