JP2008006576A - Guillotine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of the conventional guillotine wherein when a number of paper sheets are stacked and cut, excessive force is required, or the cut ends are apt to be non-uniform, so that in the guillotine only for this purpose, a mechanism for pressing paper sheets and a high-rigidity cutting blade are needed to increase the weight, raise the price and complicate the operation. <P>SOLUTION: A straight double-edged cutter is pressed to a cradle through a boosting mechanism at its central position. Since a thin double-edged cutter will not cause shifting of paper sheets in cutting, the cutter and an enclosure are plate members to secure necessary rigidity, and the central position of the cutter is constructed so that the boosting effect becomes maximum at the stroke end. Thus, it is possible to provide a guillotine which can be simply operated by one hand, light-weighted and small-sized. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cutting machine used for stacking a plurality of sheet materials (hereinafter referred to as “paper”) such as paper, film, and cloth and cutting them into a straight line.

Conventionally, in order to cut paper into a straight line, (1) one having a structure in which one end of a straight fixed blade and a movable blade are connected by a shaft and the blade edges are in sliding contact with each other (for example, see Patent Document 1). 2) A structure configured by a slider that holds and slides a circular blade and a receiving portion of the blade edge of the circular blade (for example, see Patent Document 2), or (3) a structure that presses a highly rigid blade parallel to the paper. (For example, refer to Patent Document 3), and (4) using a straight blade with a thin blade (see Patent Document 4. This application relates to the same inventor and patent applicant as the present invention). )
Japanese Utility Model Publication No. 3-29295 Japanese Utility Model Publication No. 2-27890 JP 2000-254892 A JP 2005-193366 A

  In the conventional cutting machine having the structure of (1) or (2), when the stacked paper is cut, the operation force is remarkably increased, and the stacked paper is displaced, resulting in a cut surface. There is a tendency to become uneven.

  Such a defect in the conventional cutting machine (1) or (2) has a structure in which the material to be cut (paper) is sequentially cut from one end to the other end in order to reduce the operating force. However, this causes a shift in the paper being cut, and causes an increase in operating force proportional to the increase in the number of papers to be cut.

  For this reason, with the structure of the conventional cutting machine (1) or (2), the maximum number of sheets that can be used to cut the normally used office paper (thickness of about 0.09 mm) at one time is limited. There is a tendency that even if an attempt is made to cut a number exceeding this, the force required for the operation becomes excessive, and the cut surface becomes extremely uneven.

  On the other hand, the conventional cutting machine having the structure (3) is originally used for cutting the stacked paper, and can obtain a proper cut surface. In order to ensure a sufficient rigidity for both the blade and the sliding portion for guiding the blade, the size and weight are extremely large and therefore expensive.

  In order to overcome the drawbacks of the conventional cutting machine, the structure of (4) has been proposed, but there are still many problems in size and operability.

  In the cutting machine of (4), in order to give rigidity to both the cutter and the cradle, each U-section member is used, and the cutter is driven by screws at both ends.

  In such a structure, the cutting machine cannot be reduced in size so much, and the driving operation with the screws at both ends is performed with both hands, and the cutting operation of the blade after cutting is also quick because the screws are rotated with both hands. The operation cannot be performed.

  An object of the present invention is to eliminate the above disadvantages and to provide a small, lightweight cutter that can be used as a stationery on a desk in daily office work as a small and light cutting machine. It is.

  The cutting device of the present invention includes a straight double-edged blade having a blade edge portion corresponding to the maximum thickness of the non-cutting material of 2 mm or less, a cradle facing the blade edge of the blade fixed to a housing, and the blade. A booster drive mechanism for driving the cradle side at the center position is provided.

  The casing has a hole through which a sheet material to be cut passes in the vicinity of the center of a pair of flat plates, and a cutter is disposed above the casing and a cradle is disposed below.

  The blade has a pair of side plate materials that project the blade edge portion and grips both side surfaces of the blade and a back plate material that is thinner than the blade on the back surface of the blade, and a plurality of screws between the side plate materials. It is a fixed structure.

  The cradle having a rectangular cross section is provided with a back reinforcing material thinner than the cradle on the back surface, gripped by a housing, and fixed between the housings by a plurality of screws.

  The booster driving mechanism has a structure in which the amplification of the force is maximized at the end of the cutting process.

  Since the cutting device of the present invention has the structure as described above, the cutting edges of both blades can be cut evenly on both sides without particularly pressing and fixing the stacked paper. The operation is also simple because the center position of the blade is pressed through the booster drive mechanism without any deviation.

  In the cutting apparatus of the present invention, if the casing is a pair of flat plates, the force applied to the cutting works in the direction in which the plate is most difficult to deform (in-plane direction), so that the apparatus can be made thin.

  In the cutting apparatus of the present invention, if the back and both sides of the blade are reinforced, the entire blade can have sufficient rigidity even if the blade having a high hardness and sharp edge is thin and thin, Since the structure is fixed with screws, it is easy to replace the blade worn by repeated use.

  In the cutting apparatus according to the present invention, the structure in which the back surface of the cradle having a rectangular cross section is sandwiched between a pair of housing flat plates and fixed by screws, the worn cradle can be easily replaced by repeated use. is there.

  In the cutting apparatus according to the present invention, if the structure is such that the amplification of the force is maximized at the end of the stroke of the booster driving mechanism, in addition to the paper cutting resistance, a gap caused by the shape error between the blade and the cradle at the end of the stroke. The driving force required for performing reliable cutting can be effectively utilized by eliminating the bending of the structural member or by inserting the tip of the blade edge into the cradle.

  As described above, the cutting device according to the present invention can provide a device that can cut straightly into a straight line without causing a shift in the stacked paper, while having a small, light and simple structure.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In the figure, the blade 1 is suspended from the two shafts attached to the drive rod 3 inside the housing 2, the drive shaft 4 and the rotary support shaft 5 at the approximate center position by the drive shaft 4. The support shaft 5 is held by the housing 2 to rotatably support the drive rod 3. When the drive rod 3 is rotated in the direction of arrow A, the blade 1 moves downward and presses the blade edge against the cradle 6.

  Paper (not shown) placed in the opening 2 b provided in the housing 2 is sandwiched between the blade 1 and the cradle 6 and is cut by the sharp blade edge of the blade 1.

  The force required to cut by cutting the blade edge of a commonly used blade parallel to the paper on the table varies greatly depending on the type of paper to be cut and the sharpness of the blade edge, but the value is 2 to 2 per mm. 5N.

  In the embodiment of the present invention shown in the figure, the width of the opening 2b of the housing 2 is 220 mm, which is intended to cut the short side (210 mm) of JIS A4 size paper. In order to press the blade 1 downward and cut the paper, a force of 420 to 1050 N is required, but the length of the arm of the driving rod 3 with respect to the distance of 12 mm between the driving shaft 4 and the rotating support shaft 5. Is about 125 mm, so the boosting power is about 10 times, and the force to be applied to the tip of the driving rod 3 is about 42 to 105 N, which is a force that can be easily obtained as a normal manual tool. is there.

  However, it is difficult to expect that the blade 1 and the pedestal 6 are so straight or flat that they can be ignored with respect to the thickness of the paper at the stroke end position where the blade 1 descends and the cutting edge contacts the cradle 6. Therefore, when the blade 1 is pressed against the cradle 6, the elastic deformation generated in both members and the cutting edge of the blade 1 are fitted into the cradle 6, so that reliable cutting must be performed.

  Thus, the elastic deformation generated in the blade 1 and the cradle 6 has an effect of supplementing the shape accuracy of both members. On the other hand, in order to cut the paper, a force of 2 to 5 N per mm is essential. The member must be stiff enough to transmit this force and is therefore not allowed to undergo elastic deformation very easily.

  Further, since the material of the cradle 6 is soft, it is easy to cause wear due to repeated use, or stress is prevented from concentrating at the blade edge, and the paper is pushed in without being cut. Therefore, a hard resin or wood is used. It is desirable.

  That is, in order to perform reliable cutting, at the end of the stroke, in addition to the cutting force of the paper, a force for elastic deformation of the constituent members or insertion of the blade edge into the cradle is required.

  In the embodiment of the present invention, in the standby position shown in FIG. 1, the drive shaft 4 is in the direction of rotation of about 30 degrees with respect to the rotation support shaft 5, and in the stroke end position shown in FIG. Therefore, in addition to the approximately 10-fold boost due to the above-mentioned arm length ratio, it has a structure that increases about 15% at the standby position and about 100% at the end position. If a force of 100 N is applied, a force of about 2000 N can be generated at the end of the stroke.

  In the embodiment of the present invention, since the manual cutting machine is used, the drive shaft 4 and the rotary support shaft 5 are arranged in this way. However, when using rotational power such as a motor, for example, the drive shaft 4 is eccentric on the prime mover side. It is possible to increase the boost at the end of the stroke by using a mechanism such as a cam, toggle or four-bar link.

  Now, in the cutting device, such a large force is generated, so that the component members need to have sufficient rigidity to be stably operated without causing excessive deformation. 3, the blade edge material 1a is sandwiched between a pair of side surface materials 1b, and the back surface is held by a back plate material 1c that is somewhat thinner than the blade edge material 1a, and is fixed by a plurality of screws 1d.

  If the blade 1 has such a structure, the force acting on the blade 1 is in the surface direction of the side material 1b and the back plate material 1c, so that a large rigidity can be obtained while being lightweight as a whole.

  In the conventional cutting machine (3), since a single-edged blade is used, it is necessary to keep the blade straight against the force acting in the thickness direction of the blade, and thus high rigidity is also required in the thickness direction. Moreover, the blade was heavy as a whole.

  Further, when the blade 1 has such a structure, when the blade edge is worn or chipped by repeated use, it can be easily replaced with a new blade edge material 1a using the screw 1d.

  In FIG. 3 showing this embodiment, it is shown that a plurality of commercially available cutter blades are used as the blade edge material 1, but replacement is easier if one long blade edge material is used.

  Further, the housing 2 in the embodiment of the present invention is composed of a pair of flat plates 2a having an opening 2b in FIG. Also, the back reinforcing member 2c having a small thickness is arranged and fixed by screws 2d.

  With such a structure, the cradle 6 can have high rigidity as an integral part of the flat plate 2a and the back reinforcing material 2c on both sides, and both the flat plate 2a and the back reinforcing material 2c are made of plate material, In order to utilize the high rigidity, a thin and light cutting machine as a whole can be obtained.

  Further, when the housing 2 has such a structure, when the cradle 6 is worn out by repeated use, the cradle 6 can be easily replaced with a new cradle 6 using the screw 2d. Can be used as a square cross section as in the embodiment of the present invention.

  The front view of the cutting machine which shows the standby state of 1st Embodiment of this invention   Front view of the cutting machine showing the operation completion state of the cutting machine   Exploded view showing the configuration of the cutter of the cutting machine   Exploded view showing the configuration of the cutting machine casing   Exploded view showing the overall configuration of the cutting machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutlery 1a Cutting edge material 1b Side surface material 1c Back surface plate material 2 Housing | casing 2a Flat plate 2b Opening part 2c Back surface reinforcing material 3 Drive rod 4 Drive shaft 5 Rotation support shaft 6

Claims (5)

  A straight double-edged blade having a cutting edge portion corresponding to the maximum thickness of the non-cutting material having a thickness of 2 mm or less, a receiving table facing the cutting edge of the cutting tool fixed to a housing, and the receiving blade at the central position thereof. Cutting machine featuring a booster drive mechanism that drives to the side.   The cutting machine according to claim 1, having a structure in which a blade having an opening that allows a sheet material to be cut to pass therethrough in the vicinity of a center of a pair of flat plates and a blade between the housing and a cradle are disposed below the housing.   The cutting tool projects a cutting edge portion of the cutting edge material, arranges a pair of side materials for gripping both side surfaces of the cutting edge material, and a back material thinner than the cutting edge material on the back surface of the cutting edge material. The cutting machine according to claim 1, wherein the cutting machine is fixed by a plurality of screws.   2. The structure according to claim 1, wherein the casing has a structure in which a back reinforcing material thinner than the cradle is disposed on the back surface of the cradle having a rectangular cross section, is gripped by a pair of flat plates, and is fixed between the flat plates by a plurality of screws. Cutting machine.   The cutting machine according to claim 1, having a structure in which the amplification of the force of the booster driving mechanism is maximized at the end of the cutting process.

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