JPS6232514Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cutter used for manually cutting paper or other sheet-like materials.

(Prior Art) In most conventional cutters of this kind, the cutting edge protrudes at fixed intervals, and the blade body is flat and the direction of the cutting edge is fixed. Therefore, the amount of protrusion of the cutting edge cannot be optimally matched to the thickness of the material to be cut, and there are also drawbacks such as the inconvenience of having to change the grip when cutting in a curved shape.

Therefore, the applicant of the present application has made the proximal end of the cutter main body point-contact with the dispensing body to make it rotatable, and the amount of protrusion of the cutting edge is controlled by the protrusion of the dispensing body or the mouthpiece member, etc. This paper presents an idea for a cutter that eliminates the above-mentioned drawbacks by making it possible to make small changes by moving the screw.

(Problems to be solved by the inventions) Although the cutters according to these inventions completely solve the above-mentioned drawbacks and are satisfactory in terms of function,
The mechanism for feeding out the cutting edge is somewhat complicated, which may lead to higher manufacturing costs.Also, when performing the feeding operation of the cutting edge, especially when changing the amount of protrusion of the cutting edge in a subtle manner, it is necessary to use the tip shaft near the cutting edge. Operating the rear end shaft requires more attention and tends to be more successful than operating the rear end shaft, but these methods involve manipulating the rear end shaft or distal end shaft. Even if the tip shaft (e.g. mouthpiece) moves in the axial direction, the fixed cutter body relatively protrudes or retracts the cutting edge, and the tip shaft moves in the screwed position. (In particular, the tip shaft cannot have a long thread due to its structure, so the threaded distance is short and there is a strong tendency for this to occur.) Also, the joint between the tip shaft and the main body shaft However, there are still some drawbacks, such as the appearance of gaps due to the appearance of gaps.

The present invention aims to eliminate such drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a rear shaft 2 provided with projections 1 at required locations on the inner surface, and a rear shaft 2 rotatably joined to the rear shaft 2. Female thread part 3 on the inner surface
A tip shaft 5 is formed with a pipe body 4 protruding from its tip, and a male threaded portion 6 screwed into the female threaded portion 3 of the tip shaft 5 is formed on the outer peripheral surface of the tip. An axial groove 7 into which the protrusion 1 of the rear shaft 2 fits is provided on the outer peripheral surface of the part, and a feeding body 9 having a recess 8 on the distal end surface, and a rear end of a small diameter rod-like body 10 having a blade at the distal end. A cutter body 1 is provided with a pivot 11 and a small diameter rod-shaped body 10 is inserted into the pipe body 4 of the tip shaft 5 so as to be rotatable and slidable in the axial direction.
2, and a coil spring 14 attached to bring the sharp point 13 of the pivot 11 of the cutter body 12 into irremovable contact with the recess 8 of the distal end surface of the feeder body 9.

(Function) The main functions of the cutter of the present invention are that the amount of protrusion of the cutting edge can be finely adjusted and the direction of the cutting edge can be changed to facilitate cutting of curved lines.
First, the amount of protrusion of the cutting edge is changed by rotating the tip shaft 5 with respect to the rear shaft 2. The front shaft 5 can freely rotate with respect to the rear shaft 2, but does not move in the axial direction, and the positional relationship is fixed. When the tip shaft 5 is rotated, the projection 1 of the rear shaft 2 fits into the groove 7 at the rear end of the feeding body 9, which has the male threaded portion 6 on the outer circumferential surface of the tip portion screwed into the female threaded portion 3 on the inner surface of the tip shaft. It moves in the axial direction because it cannot rotate. Therefore, the feeding body 9
The cutter body 12, which has the pivot 11 in contact with the concave portion 8 on the distal end surface by a coil spring 14, also moves its blade toward the pipe body 4 of the tip shaft 5 as the feeder body 9 moves.
protrude from or sink into. The cutter main body 12 can rotate freely by bringing the sharp point 13 of the pivot 11 into point contact with the distal end surface of the dispensing body 9, but a coil spring 14 acts to keep the pivot 11 in constant contact with the dispensing body 9 and prevent it from separating. are doing. The pressing force of the coil spring 14 on the pivot 11 is
Set it so that the rotation of step 4 is not impaired.

(Embodiment) The drawings show an embodiment of the present invention. First, FIG. 1 shows the first embodiment, in which a protrusion 1 provided on the inner surface of the rear shaft 2 punches and dents the outer surface of the rear shaft 2. The feeding body 9 has a male threaded portion 6 formed on its outer peripheral surface, a fitting shaft portion 15 protrudingly provided on its rear end surface, and a concave portion 8 on its distal end surface having a conical shape and a slightly small diameter distal shaft portion. 16 and the rear end shaft portion 18 has an inner hole 17 into which the fitting shaft portion 15 of the tip shaft portion 16 is press-fitted, and has an axial groove 7 on its outer surface and a diameter larger than that of the tip shaft portion 16.
The coil spring 14 is attached to the outer periphery of the narrow rod-shaped body 10 of the cutter body 12 between the jaw of the pivot 11 and the inner wall of the tip end of the tip shaft 5.

Next, FIG. 2 shows a second embodiment, and the differences from the first embodiment described above are explained below.
is similarly composed of two parts, the tip shaft part 16 and the rear end shaft part 18, but the fitting shaft part 15 is not formed at the rear end of the front shaft part 18, and the rear end of the front shaft part 18 remains as it is. It is screwed onto the rear end shaft portion 18. Further, the recess 8 on the distal end surface of the feeding body 9 has a flat surface with which the sharp point 13 of the pivot 11 comes into contact, and its peripheral wall 19 surrounds the outer peripheral surface of the pivot 11 to prevent the pivot 11 from shifting laterally. .

Next, FIG. 3 shows a third embodiment, and the difference from the first embodiment is that the feeding body 9 has a tip shaft portion 16.
It is not composed of two parts: and rear end shaft part 18, but one.
It is made up of parts.

In each of the above-described embodiments, the coil spring 14 is interposed between the pivot 11 and the inner wall of the tip opening edge, so the amount of compression of the coil spring 14 changes as the feeding body 9 moves, and the pressing force on the pivot 11 changes. changes. Therefore, if this is utilized to increase the amount of movement of the feeder 9, the pivot 11 will be prevented from rotating, which is convenient for polishing the blade. However, if you want to keep the pressure of the coil spring 14 constant, by integrally fixing a frame member that supports the lower end of the coil spring 14 to the tip of the feeding body 9, the pressure of the coil spring 14 will always remain constant even if the feeding body 9 moves. remains constant.

(Effects of the invention) Since the present invention is constructed as described above, the structure is simplified and manufacturing is also facilitated.Also, the front shaft always maintains a constant positional relationship with the rear shaft and does not move, so the front shaft does not move. An excellent cutter that can make minute changes in the amount of protrusion of the cutting edge and change the direction of the cutting edge for cutting curves, without making the fixed state unstable or creating gaps that spoil the appearance when rotated. It becomes possible to provide

[Brief explanation of the drawing]

The drawings are longitudinal cross-sectional views showing embodiments of the present invention, in which FIG. 1 shows the first embodiment, FIG. 2 shows the second embodiment, and FIG. 3 shows the third embodiment. 1... Protrusion, 2... Rear shaft, 3... Female threaded part, 4
... Pipe body, 5 ... Tip shaft, 6 ... Male thread part, 7
... Groove, 8 ... Recess, 9 ... Feeding body, 10 ... Thin diameter rod-shaped body, 11 ... Pivot, 12 ... Cutter body, 13 ... Pointed part, 14 ... Coil spring, 1
5... Fitting shaft part, 16... Tip shaft part, 17... Inner hole, 18... Rear end shaft part, 19... Surrounding wall part.

Claims (1)

[Scope of utility model registration request] A rear shaft with protrusions provided at predetermined locations on the inner surface, a front shaft rotatably joined to the rear shaft, a female threaded portion formed on the inner surface, and a pipe body protruding from the tip; A male screw portion is formed on the outer peripheral surface of the rear end portion to be screwed into the female screw portion of the front shaft, and an axial groove into which the protrusion of the rear shaft fits is provided on the outer peripheral surface of the rear end portion, and a recess is formed on the front end surface. A pivot is attached to the rear end of a small-diameter rod-like body having a blade at the tip, and the small-diameter rod-like body is inserted into the pipe body of the tip shaft so as to be rotatable and slidable in the axial direction. A cutter body comprising a cutter body, and a coil spring attached to bring a sharp point of a pivot of the cutter body into irremovable contact with a recessed portion of a distal end surface of the feeder body.