JPH03196996A - Paper cutter - Google Patents

Abstract

PURPOSE:To simplify the whole structure as well as to enhance the durability of a cutting edge by grinding a cutter tip with a sharpener plate all the time together with movements of a rotary cutter continuing both large and small parts of a distance of up to a turning center, installed in a movable body supported by a guide bar. CONSTITUTION:A sheet of paper is fed in space between the upper part of a sharpener plate 31 and a rack 26 in the state that a rotary cutter 30 has approximated to the side of a fixed block 23 or 24 and then it is stopped at the specified spot, turning a handle 37, and a movable body 27 is shifted along a guide bar 25 via pulleys 32, 33 and a sheave 34. If so, the rotary cutter 30 is rotated via a pinion 29, and it is pressed to the plate 31 by the movable body 27, a weight 27b, a turning shaft 28, the pinion 29 or the like so that the paper is favorably cut off, and a cutter tip is ground at once by the sharpener plate 31. The rotary cutter 30 is formed into an ellipse of length/breadth > 2 or so, and it rotates at a high speed and, what is more, a 1/2 length distance, where force pushing the paper downward is large, sharply becomes longer than a 1/2 breadth distance, whereby it forcedly cuts the paper down ward all the time, and any movement of the paper in the traveling direction of the rotary cutter 30 is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] The present invention relates to a paper cutter for cutting paper, which is used, for example, in facsimile machines.

``Prior Art'' Conventionally, a paper cutter configured as shown in FIG. 8 is known for cutting paper fed to a cutting section in a facsimile machine.

That is, the frame 1 is attached to the facsimile main body,
A small motor 2 is attached to one end of the frame 1. A worm 3 is provided on the rotating shaft of the small motor 2, and a worm wheel 4 rotatably attached to a frame 1 is meshed with the worm 3.

On the other hand, fixed teeth 5 having upward blades 5a are attached to the frame 1, and a fixed shaft 6 is also attached. Lever 7.8 is rotatably attached to each side of the fixed shaft 6, and an L-shaped rotary blade mounting member 9 is provided between the levers 7.8 and integrally with these levers 7.8. . A rotary blade 10 is fixed to the lower surface of the rotary blade attachment member 9. The lever 7 is provided with a long hole 7a, and the lever 7 is provided in the host of the worm wheel 4, and the lever 7 is provided with a long hole 7a.
It can be rotated about the fixed shaft 6 by means of a bottle 11 which is slidably fitted into the housing. 12,13.
14 is a paper guide, paper guide 12.1
A paper insertion hole 15 is formed between the holes 3 and 3.

Therefore, in the state shown in FIG. 8, the paper 16 is inserted into the paper insertion hole 15 by a drive mechanism (not shown), and this paper 16 is further inserted between the fixed blade 5 and the rotating blade 10, and the small motor 2 is driven. And warm 3. The lever 7, ) 3 rotates via the worm wheel 4° pin 11, and accordingly, the lever 7.81 rotates together with the power attachment member 9, so that the rotating blade 10 brings its tip 10a close to the upward facing blade 5a. It rotates, and the paper 16 is cut by the upward blade 5a of the fixed blade 5 and the cutting edge 10a of the rotating blade 1'O. The distance between the upward blade 5a and the cutting edge 10a of the rotating force 10 for cutting the paper 16 is slightly wider on the lever 8 side than on the lever 7 side.

"Problem to be Solved by the Invention" However, in such a conventional paper cutter, the paper 16 is cut by rubbing two blades, the fixed blade 5 and the rotating blade lO, together. If the frame l is even slightly distorted, the distance between the -L-oriented blade 5a and the cutting edge 10a will change slightly, making it difficult to cut the paper 16. Therefore, the strength and assembly precision of the frame l must be sufficiently increased. This has the disadvantage of increasing costs.

In addition, the width of the upward blade 5a of the fixed blade 5 (the length in the length direction of the fixed shaft 6) and the width of the tip 10a of the rotary blade 10 (the length in the length direction of the fixed shaft 6) are both facsimile Since the fixed blade 59 and the rotating blade 10 need to have a longer width than the width of the paper 16 used for It has a problem of being easily cut and having poor durability.

Also, if the position is no longer sharp, the fixed blade 51 rotating blade lO
There was also the problem that it was uneconomical to have to replace the parts.

Furthermore, the upward blade 5a for cutting the paper 16
The spacing between the cutting edges 10a of the rotating blade 10 is slightly wider on the lever 8 side than on the lever 7 side, and the cutting edge of the rotating blade 10 is slightly wider than the spacing on the lever 8 side with respect to the tip of the blade 5a facing -L. 10a is inclined, but if this angle of inclination or C increases a little, the paper 1 will move from the Leno Xl-7 side to the lever 8 side.
There is also the problem that 6 is pushed and moved.

It is an object of the present invention to provide a paper cutter that eliminates the above-mentioned problems associated with conventional paper cutters.

1. Means for Solving Problem 1" The present invention has the following structure 1 to achieve the above object.
There is Toshi-C. That is, a movable body movably supported by a guide rod, a moving mechanism coupled to the movable body to move the movable body along the guide rod, and a moving mechanism rotatably attached to the movable body and provided on the outer periphery. a rotary blade having a wide shape in which the distance from the blade edge to the rotation center is continuous between a large part and a small part, a rotation mechanism that rotates the rotary blade in conjunction with the movement of the moving body, and the moving body a grinding plate provided so as to be able to face at least one side of the entire cutting edge of the rotating blade from one end side to the other end side of the moving range; and the guide rod generated from the weight of the moving body is attached to the grinding plate A pressing means is provided for pressing the rotary blade using a rotational force around the center.

"Operation" According to the above configuration, when cutting paper, the paper is fed within the movement range of the rotary blade, and the moving mechanism moves the reciprocating body. Then, as the movable body moves, the rotary blade moves and rotates, cutting the paper.

In this case, the paper is cut smoothly by constantly pressing the rotary blade against the sharpening plate and by constantly sharpening the cutting edge of the rotary blade by the sharpening plate.

In addition, the shape of the rotary blade has a wide shape where the distance from the cutting edge provided on the outer periphery to the center of rotation is a long part and a small part that smoothly continue, so when the rotary blade rotates, the cutting edge The paper is often pushed downward by the part where the distance from the center of rotation is large, and the force is large, so the rotating blade always pushes the paper downward to prevent the paper from moving in the direction of movement of the rotating blade when cutting the paper. To prevent.

In addition, since the rotary blade is sharpened by a sharpening plate each time it is moved, not only on the outward journey but also on the iu route, the sharpness is always kept good.
It improves durability and dramatically reduces the number of times the rotary blade needs to be replaced.

"Embodiment" Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 4.

Reference numeral 21 in FIG. 1 denotes a base, and this base 21 consists of a bottom plate 22 and fixed stands 23 and 24 that are mounted upright on both ends of this bottom plate 22, respectively.

Between the fixed stands 23 and 24, a kite rod 25 and a rack 26 located above and below, respectively, are provided parallel to the bottom plate 22. The guide rod 25 is made of a round rod, and both ends of the guide rod 25 are attached to the upper part of the fixed base 23.24, respectively, and both ends of the rack 25 are attached to the upper part of the fixed base 23.24, respectively.
is attached to the bottom of the.

The upper part of a movable body 27 is fitted into the guide rod 25 so as to be slidable and rotatable in the directions of arrows Δ and B about the guide rod 25 in FIG.
A rotating shaft 28 is attached in a direction perpendicular to 6.

The moving body 27 has a substantially rectangular parallelepiped shape, and the upper part thereof is a guide rod 2.
5 side to become a protrusion 27a, and this protrusion 27a
is slidably fitted into the guide rod 25. Mobile object 2
A weight 27b made of a rectangular parallelepiped is attached to the lower part of the weight 7. Further, a pinion 29 is fitted and fixed to the rotating shaft 28, and this pinion 29 is meshed with the shaft 26. Further, a rotary blade 30 is fitted and fixed to the tip of the rotary shaft 28 on the pinion 29 side. This rotary blade 30 is formed into an elliptical shape from the front and a trapezoid from the side. Note that the moving body 27° rotation axis 28. Rack 26. Pinion 29. Pulleys 32, 33 to be described later. A rotation mechanism that rotates the rotary blade 30 is configured by a rope 34 and the like.

On the other hand, a sharpening plate 31 made of a long material with a rectangular cross section is attached to the lower end of the fixed base 23, 24 in parallel with the bottom plate 22. This sharpening temporary 31 is made of a plastic material evenly mixed with ceramic powder. This sharpening plate 31
The side of the rotary blade 30 is always sharpened 1li23 of the rotary blade 30.
The side periphery 1 of the first side surface is brought into contact with the rotary blade 30 by sliding the rotary blade 30 against the sharpening plate 31.
It is made to be sharpened. That is, the rotational force (moment) that causes the moving body 27 to rotate in the six directions shown by the arrows in FIG. 3 about the guide rod 25 due to its own weight, weight 27b, etc.
Because of this, the rotary blade 30 attached to the movable body 27 is always pressed against the sharpening plate 31, and as the movable body 27 moves, which will be described later, the rotary blade 30 slides against the plate 31 by 6 degrees, and this sharpening plate is removed. It is designed to be sharpened by 31.

Pulleys 32 and 33 are mounted on the upper surface of the fixed base 23 and 24, respectively.
is mounted horizontally rotatably, and these pulleys 32.3
A rope 34 is wound around 3.

One end of the rope 34 is attached to a protrusion 35 on the upper surface of the movable body 27, and the other end is attached to a protrusion 36 on the upper surface of the movable body 27. A handle 37 is attached to the pulley 32 so as to be rotatable therewith. In addition, Fu'J32, 33. Rope 34
．． The handle 37 constitutes a moving mechanism for moving the moving body 27.

Reference numeral 38 in FIG. 3 is a paper to be cut.
Slightly above the lowest end of the rotary blade 30 when the rotary blade 30 is located at the lowest end position of the outer circumference of the elliptical minor diameter part of the rotary blade 30 when rotated (
For example, it is positioned horizontally at a height of 5 rn m ) and is fed from the left side to the right side in FIG. 3 by a feeding mechanism (not shown).

Therefore, when cutting the paper 38, the rotary blade 3
0 is close to the fixed base 23 or the fixed base 24 side, the paper 38 is passed between a part of the sharpening plate 31 and the rank 26, and the paper 3 is moved from the left side to the right side as shown in FIG.
8 is fed and stopped at a predetermined location. Next, the handle 37
Turning the. Then, pulleys 32, 33 . The movable body 27 moves left and right in FIGS. 1 and 2 along the guide rod 25 via the rope 34.

Then, since the pinion 29 is engaged with the rack, the pinion 29 rotates, and along with this, the rotary blade 3
0 rotates and its outer peripheral blade cuts the remover 3B. Note that the moving body 27, the weight 27b2, the rotating shaft 28. A means for pressing the rotary blade 30 against the sharpening plate 31 using a pinion 29 or the like is configured.

In this case, since the rotary blade 30 is always pressed against the sharpening plate 31 by a means, that is, by the moment centered around the guide rod 25 of the movable body 27, the paper 38 can be cut well. I can do it,
Even if the cutting edge of the rotary blade 30 is worn out, it is immediately sharpened by the sharpening plate 31, so that the paper 38 does not become sharp.

Further, the shape of the rotary blade 30 is an ellipse with major axis/minor axis>2, and the rotation speed of the rotary blade 30 is approximately 50 Orpm/w.
The rotary blade 30 is set to rotate at a high speed of "in", and while the rotary blade 30 rotates 1/4 from the state where the major axis (2R) of the ellipse shown in FIGS. 1 and 4 is horizontal, the rotary blade 30 rotates as shown in FIG. The rotary blade 30 is moved by 1/2 major axis distance S of the ellipse as shown, cuts between this distance S, and in the next 1/4 rotation, the paper 38 is cut by the short axis of the ellipse, that is, r length as shown in FIG. The rotary blade 30 is reversed, and in the next 1/4 rotation, the paper 38 is cut by S distance in the same manner as above, and then (in the 174th rotation, the paper 38 is cut in the same manner as above).
The distance is cut and the rotary blade 30 rotates once.

Therefore, by continuing to turn the handle 37, the moving body 2
7 from the fixed base 23 to the fixed base 24 side.
．． The paper 38 between the fixed bases 24 is separated by the rotary blade 30.

In this case, the rotation speed of the rotary blade 30 is approximately 50 Orpm/w.
Since the rotation is set at a high speed of 1.5 in, and the shape of the rotary blade 30 is an ellipse with major axis/minor axis>2, the distance between S where the force of pushing the paper 38 downward by the rotary blade 30 is large is the distance r. As a result, the rotary blade 3
0 always pushes paper 38 downward and paper 3
The rotary blade 30 of No. 8 is prevented from moving in the moving direction.

Further, since the rotary blade 30 is elliptical, its overall length is much shorter and wider than the fixed blade 5 and the rotary blade 10 described in the conventional example, so it does not lack strength and has durability. Since it is sharpened by the sharpening plate 31 not only on the outward journey (also on the n-way), the sharpness does not deteriorate, and the durability is greatly improved and the number of replacements is drastically reduced. I can do it.

In addition, by incorporating the holder (h) of this embodiment into a facsimile and making it possible to drive the rotary shaft of the pulley 32 in place of the handle 37 to rotate as appropriate with the operation of the facsimile, it can function as a cutter for the facsimile. .

In the above-mentioned embodiment, the rotary blade 30 is made into an elliptical shape, but is not limited to this; for example, as shown in FIG.
(Distance R from the center of rotation to the apex>Distance Nr from the center of rotation to the side) 41 may also be used, or as shown in Figure 6, a disk-shaped rotary blade that rotates eccentrically (from the outer periphery to the center Maximum distance R> Minimum distance from outer circumference to center of rotation t!I
tr) 51 may be used, and as shown in FIG.
) 61 may be used, and rotary blades of other shapes may also be used without departing from the spirit of the present application.

"Effects of the Invention" According to the present invention, there is provided a movable body movably supported by a guide rod, a moving mechanism connected to the movable body to move the movable body along the guide rod, and a movable body movably supported by the movable body. A rotary blade with a wide shape that is rotatably attached and has continuous long and short distances from the cutting edge to the rotation center provided on the outer periphery, and the rotary blade is linked to the movement of the moving body. a rotation mechanism for rotating; a sharpening plate provided so as to be able to face at least the -blade side of all cutting edges of the rotary blade from one end side to the other end side of the moving range of the movable body; The pressing mechanism for pressing the rotary blade by the rotational force centered on the guide rod generated from the amount of electric charge of the moving body is configured to consist of a means, so that even during sharpening, the pressing is always pressed against the rotary blade by the means. The rotary blade can always cut paper well, and even if the cutting edge of the rotary blade is worn out, the rotary blade is sharply sharpened, so the paper will not cut poorly.

In addition, the shape of the rotary blade is such that the distance from the cutting edge provided on the outer periphery to the center of rotation is smoothly continuous between a large part and a small part, so when the rotary blade rotates,
The distance from the cutting edge to the center of rotation often pushes the paper downwards, and the force is large, so the rotating blade always pushes the paper downwards and moves the paper in the direction the rotating blade moves when cutting the paper. can be prevented.

In addition, the rotary blade is wide and is sharpened by a sharpening board each time it is moved, not only on the 11th pass, but also on the return pass, so it does not lose its sharpness, greatly improving its durability, and significantly reducing the number of times it needs to be replaced. I can do it.

Furthermore, since the structure is relatively simple and compact, it is not only convenient to carry and can be used over a wide range of areas, but also can function as a facsimile cutter by incorporating it into a facsimile and operating the moving body using a moving mechanism.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
Figure 1 is a front view, Figure 2 is a side view, Figure 3 is a sectional view taken along the The figures show other embodiments of the present invention, and FIG. 5 is a rear view of the approximately triangular rotary blade, and FIG.
7 is a rear view of the eccentric disk-shaped rotary blade, FIG. 7 is a rear view of the propeller-shaped rotary blade, and FIG. 8 is a partially cutaway oblique view showing an example of a conventional paper cutter. 25...Guide rod, 26...Rack, 2
7...Moving body, 27b... Weight,
28... Rotating shaft, 29... Pinion,
30,41,51.61...rotary blade, 31...
...Sharpening plate, 32.33...Pulley, 34.
...Rope, 37...Handle.

Claims (1)

[Claims] a moving body movably supported by a guide rod; a moving mechanism coupled to the moving body to move the moving body along the guide rod; and a moving mechanism rotatably attached to the moving body and provided on the outer periphery. A rotary blade having a wide shape in which a portion where the distance from the cutting edge to the center of rotation is large and a portion where the distance is small is continuous; a rotation mechanism that rotates the rotary blade in conjunction with the movement of the movable body; and a movement of the movable body. a sharpening plate provided so as to be able to face at least one side of the entire cutting edge of the rotary blade from one end side to the other end side of the range; and a pressing means for pressing the rotary blade with a rotational force.