JP6908802B2 - cutter knife - Google Patents

Description

The present invention relates to a utility knife that forms a notch by urging the tip of a blade with respect to a work piece at a constant angle and with a constant urging force.

A cutter knife has been proposed in which a part of the blade is pressed by a spring to press the tip of the blade against the cutting portion with a predetermined pressure. For example, in order to obtain the urging force acting on the tip of the blade, a method of adjusting the pressing force of the spring provided at the rear end of the blade while the tip of the blade holder is in contact with the cutting portion has been proposed (for example). , Patent Document 1). Further, by keeping the blade holder constant in the neutral position by the repulsive force of the spring and the repulsive force of the permanent magnet, the fluctuation of the force applied to the blade holder is absorbed and the pressing force applied to the tip of the blade is kept constant (for example). , Patent Document 1).

Further, a method has been proposed in which a part of the ridge portion on the opposite side of the blade tip is pushed by a spring while the sliding contact portion is pressed against the cut portion at a predetermined angle (see Patent Documents 2 and 3). ). In these methods, the tip of the blade holder opening or the guide portion is pressed against the member to be cut while sliding. Therefore, damage to the sliding portion has been a problem on the surface of the cut member that is easily damaged by printing or thin film coating.

A cutter for a ceramic plate has been proposed in which a holding portion and a handle portion of a roller blade are fixed to a main body with wheels so that the angle and pressing force of the roller blade can be kept constant (for example, Patent Document 4). In such a method, the possibility of damaging the surface of the member to be cut is low as compared with the sliding angle adjusting method. On the other hand, it is necessary to keep the pressing force constant by controlling the pressing force by hand. However, it has been difficult to quantitatively control the pressing force by adjusting the force of the hand.

As a method for cutting a thin film, the present inventor urges the tip of a blade to a cut portion by using a force that a magnet provided on the back surface side of a member to be cut attracts the blade toward the cutting edge, and the blade is in that state. , Or a method of cutting the coating film by moving one of the members to be cut (Patent Document 5). However, it is difficult to cut when the thickness of the cut member is several millimeters or more or when the shape of the cut member is three-dimensional or spherical.

As a method for forming a stable notch, the present inventor includes a plurality of blades having engagement holes, a fulcrum shaft for axially attaching the blades in parallel in the blade thickness direction, and the fulcrum shaft is axially attached to the fulcrum shaft. A cross-cut test apparatus comprising a blade holder for accommodating the blade, arranging a magnet between the blade edge of the blade and the coating film to be tested, and attracting the blade in the blade edge direction by the magnetic force of the magnet. (Patent Document 6). This method is a device that simultaneously forms multiple cuts in the coating film with multiple blades, but by using one blade for cutting and changing the other blades to spacer plates or short blades, the thin film can be made. It is also possible to safely cut at a constant angle and constant urging force.

JP-A-2006-68062 Jikkenhei 07-9262 JP-A-2010-264004 JP-A-2015-58539 Japanese Unexamined Patent Publication No. 2012-18142 International Publication No. 2017/007034

In applying the test apparatus exemplified in Patent Document 6, the following problems have been clarified.
(A) There are restrictions on the use of general-purpose blades made of non-magnetic materials such as ceramics.
(B) Since it is a device for making a cut in the coating film, there is room for improvement in the adjustment width of the cut depth in order to cut a cut object such as paper.
(C) Since the straightness is high, there is room for improvement in accurately cutting and cutting the free curve.
(D) When the sharpness of the blade becomes poor, the blade must be replaced, and there is room for improvement compared to the method of breaking the blade edge using the blade folding groove to make a new cutting edge. ..
The present invention has been made to solve these problems.

The above-mentioned problems of the present invention have been solved by the following inventions.
(1) A blade having an engaging hole is provided, a blade holder having an engaging hole is provided, a blade slider is provided, a holder cover for accommodating the blade holder is provided, and the blade holder is pivotally attached to the holder cover. It is characterized by having at least a pair of front and rear magnet rollers for urging a member to be cut, and attracting the blade holder toward the blade edge by the magnetic force of the magnet rollers provided close to the blade holder. It is a cutter knife to do.
(2) At least one magnet is provided between the blade holder and the member to be cut, and the magnet is in sliding contact with the holder cover. It is preferable to adjust the cutting force by adjusting the force for attracting the blade holder in the direction of the blade edge by selecting the distance.

With the cutter knife of the present invention, it is possible to form a notch with a high precision depth in a stable state by a simple operation, and it is possible to safely cut according to the thickness of the member to be cut.

FIG. 1 is a schematic perspective side view showing an example of the cutter knife of the present invention. FIG. 2 is an exploded perspective view of the cutter knife shown in FIG. FIG. 3 is a front perspective view of the cutter knife shown in FIG. FIG. 4 is a rear perspective view of the cutter knife shown in FIG. FIG. 5 is a left side view showing another example of the cutter knife of the present invention. FIG. 6 is a front perspective view of the cutter knife shown in FIG. FIG. 7 is a perspective view showing an example of a cutting method using the cutter knife and the ruler shown in FIG. FIG. 8 is a front view of the cutting method shown in FIG. 7. FIG. 9 is an exploded front perspective view showing still another example of the cutter knife of the present invention. FIG. 10 is a rear perspective view of the cutter knife shown in FIG. FIG. 11 is an exploded perspective view showing an example in which a spherical magnet roller is used for the cutter knife of the present invention. FIG. 12 is a front perspective view of FIG.

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

FIG. 1 is an example of a schematic perspective side view showing a basic configuration of a cutter knife of the present invention. 2, FIG. 3, and FIG. 4 are an exploded perspective view, a front perspective view, and a rear perspective view of the cutter knife of FIG. 1, respectively. In FIGS. 1 to 4, the cutter knife 1 is composed of a blade holder portion and a holder cover portion. The blade holder portion is provided with a blade 10 having an engaging hole 12, a blade holder 20 having an engaging hole 22, and a blade slider 30 having an engaging protrusion 32 as a basic configuration. On the other hand, the holder cover portion includes a holder cover 40, a fulcrum shaft 50, magnet rollers 60 and 62, rotating shafts 52 and 54, and magnets 70 and 71 as basic configurations. The outside of the magnets 70 and 71 can be covered with magnet sliders 72 and 73, if necessary.

In FIGS. 1 to 4, the blade 10 having the engaging hole 12 is arranged in the blade holder 20 having the engaging hole 22. The engagement hole 12 is engaged with the engagement protrusion 32 of the blade slider 30. The blade holder 20 is housed in the holder cover 40 so that the cutting edge 14 of the blade 10 in the blade holder 20 faces downward. Then, the engaging hole 22 of the blade holder 20 is pivotally attached to the fulcrum shaft 50. It is preferable that the entire or part of the lower surface (the surface close to the cutting edge) 24 of the blade holder 20 is made of a soft magnetic material. The magnet rollers 60 and 62 are axially attached to the rotating shafts 52 and 54, respectively, and are arranged on the bottom surface of the holder cover 40. The magnets 70 and 71 are slidably contacted with the holder cover 40. The magnets 70 and 71 are positioned by operating the magnet sliders 72 and 73, respectively. The magnets 70 and 71 can be removed from the rear part of the holder cover 40.

An example of how to use the cutter knife 1 shown in FIG. 1 will be described. The blade slider 30 is moved toward the tip of the blade holder 20 in a state where the magnet roller 62 of the front wheel is not in contact with the member to be cut, and the tip 16 of the blade is projected from the blade holder 20 by an appropriate amount. Next, the magnet roller 60, the tip 16 of the blade, and then the magnet roller 62 are grounded to the cut member in this order. By laying a plate or the like of a magnetic material on the back surface of the member to be cut, the cutter knife 1 can stand on its own by a magnet roller.

In order to form a cut in the cut member, the presence / absence and position of the magnets 70 and 71 are arbitrarily set according to the material and thickness of the cut member or the cut depth, and the magnet rollers 60 and 62 are the cut members. Pull the cutter knife toward you, being careful not to leave it. It is preferable to confirm the presence / absence and position of the magnets 70 and 71 by trial cutting in advance. If the notch can be formed only by the magnetic force of the magnet roller 60, the magnets 70 and 71 may be removed for use. By sliding the magnet sliders 72 and 73, respectively, the magnets 70 and 71 are positioned. The magnet sliders 72 and 73 are preferably made of soft magnetic material, but in the case of non-magnetic material, they may have soft magnetic material plates 74 and 78, respectively.

FIG. 5 is a left side view showing another example of the cutter knife of the present invention. In FIG. 5, the cutter knife 2 has a blade slider 35 arranged on the side surface. FIG. 6 is a front perspective view of the cutter knife 2 shown in FIG. 7 and 8 are a perspective view and a front view showing an example of a cutting method using the cutter knife 2 and a ruler shown in FIG.

The blade holder portion of the cutter knife 2 is provided with a blade slider 35 having a blade 10, a blade holder 20, and an engaging protrusion 36 as a basic configuration. The blade 10 is engaged with the engaging projection 36 of the blade slider 35 in the blade holder 20. The holder cover portion includes a holder cover 41, a fulcrum shaft 51, magnet rollers 60 and 62, rotating shafts 53 and 55, and a magnet 75 as a basic configuration. An opening is provided on the side surface of the holder cover 41, and the blade holder 20 is pivotally attached to the fulcrum shaft 51. The holder cover 41 has two blade holder storage portions on the left and right, and can be used properly according to the hand holding the cutter knife. When holding a utility knife with the left hand, pull the blade slider 35 held by the blade holder 20 to store the blade 10 in the blade holder 20, and push the blade slider 35 held by the blade holder 25 to cut the cutting edge of the blade 10. Take it out and use it.

The bottom surface of the holder cover 41 has a sliding contact portion 91 that can be slidably contacted with the ruler 100. The sliding contact portion 91 is provided outside the cutting edge 16 of the blade and outside the same plane as the side surfaces of the magnet rollers 60 and 62, so that the blade can stably cover the side surface of the ruler 100 without damaging it. The cut piece 110 can be cut linearly.

FIG. 9 is an exploded front perspective view showing still another example of the cutter knife of the present invention. FIG. 10 is a rear perspective view of the cutter knife shown in FIG. In FIGS. 9 and 10, the blade holder portion of the cutter knife 3 has a blade 11 having a C-shaped engaging hole 13, a blade holder 21, a blade holder grip 26 having an engaging hole 27, and an engaging protrusion 38. A blade slider 37 is provided as a basic configuration. On the other hand, the holder cover portion includes a holder cover 43 having an engaging hole 47 for the fulcrum shaft and engaging holes 48 and 49 for the rotating shaft, a fulcrum shaft 51, magnet rollers 60 and 62, a yoke 64, and rotating shafts 53 and 55. And a magnet 76 are provided as a basic configuration. The outside of the magnet 76 can be covered with a magnet cover 77, if necessary. When fixing the urging force applied to the cutting edge 17 of the blade 11, the magnet cover 77 can be fixed to the holder cover 43. The magnet is fixed to the magnet cover 77 by the bolt 80 and the nut 82.

The blade holder according to the present invention may have a holder grip integrated so as to cover the blade holder, and in that case, the holder grip may have an engaging hole. The material of the holder grip may be a soft magnetic material or a non-magnetic material such as aluminum or resin. When the holder grip is a non-magnetic material, the thickness of the lower surface during use is preferably 3 mm or less. When it becomes 3 mm or more, the attractive force by the magnet becomes weak. Therefore, the thickness of the lower surface of the grip is preferably 2.5 mm or less, more preferably 2 mm or less.

FIG. 11 is an exploded perspective view showing an example in which a spherical magnet is used for the magnet roller related to the cutter knife of the present invention. FIG. 12 is a front perspective view of the cutter knife shown in FIG. The configuration of the blade holder portion of the cutter knife 4 shown in FIGS. 11 and 12 is the same as that of the cutter knife 3 of FIG. The blade holder portion is inserted through the upper opening of the holder cover 45, and the engaging hole 27 is pivotally attached to the holder cover by the fulcrum shaft 51. The cutter knife 4 has an opening on the side surface of the holder cover 45 for operating the blade slider 37, and by sliding the blade slider 37 to the rear end portion, the blade 11 can be pulled out without removing the fulcrum shaft 51. can. The bottom surface of the holder cover 45 has a hemispherical recess, and the spherical magnet rollers 61 and 63 are sandwiched between the bottom cover 90 and fixed with screws 81. With the bottom cover 90 screwed, the gap between the spherical magnet and the holder cover 45 is preferably 0.1 to 0.2 micron. The force that urges the cutting edge 17 to the member to be cut is adjusted by the position of the magnet 75. Since the magnet roller of the cutter knife 4 is spherical, it is suitable for cutting a curved line.

The blade according to the present invention has an engaging hole at the rear end that engages with the blade slider. The blade may have a plurality of folding grooves. As the material of the blade, a material generally used as a replacement blade for a cutter knife such as steel, stainless steel, cemented carbide, and ceramic can be used. The shape of the engaging hole of the blade is not particularly limited as long as it is engaged with the engaging projection of the blade slider. In the case of a hard material such as ceramic, a C-shaped engaging hole may be used.

The material of the blade holder according to the present invention is preferably steel plate or soft magnetic stainless steel. When a non-magnetic material such as resin is used as the material of the blade holder, the attractive force of the magnet can be increased by providing the soft magnetic material part on the lower surface near the tip of the blade holder or on the surface where the magnetic force of the magnet roller near the cutting edge is applied. can get. The distance between the magnet roller or the magnet sliding on the holder cover and the blade holder is preferably 0.1 to 2.5 mm, more preferably 0.3 to 2 mm. The holder cover and the bottom cover are preferably attached and detached by screws or the like so that dirt accumulated in the hemispherical recesses and the spherical magnet roller can be disassembled and cleaned.

As the magnet roller according to the present invention, a ring-shaped magnet or a spherical magnet can be used. As the type of magnet, a neodymium magnet that can obtain a strong magnetic force even with a small size is preferable. Since neodymium magnets are vulnerable to impact, metal-plated magnets are preferable, and resin-coated magnets are more preferable. Examples of the resin coat include a nylon coat, an epoxy coat, and a fluororesin coat. The ring-shaped magnet roller is pivotally attached to the holder cover by a rotating shaft. As the material of the rotating shaft, a magnetic material is preferable.

The shape of the blade slider according to the present invention is not particularly limited, but a method in which a leaf spring is built in and fixed according to the wavy shape of the blade holder is preferable. Further, when the holder cover does not have an opening for operating the blade slider on the side surface, the shape of the blade slider 30 having a G-shaped cross section seen from the rear end portion can be operated from the upper surface of the cutter knife, which is preferable. The material of the blade slider can be resin, aluminum or stainless metal, wood, or the like.

The blade holder portion, which is basically composed of the blade holder, the blade and the blade slider, can be removed from the holder cover and used independently if necessary. When folding the blade using the folding groove, pull the blade slider toward the rear end of the blade holder, and with the blade cutting edge stored in the blade holder, push up the blade holder from below to push up the fulcrum shaft. The tip of the blade holder can be pulled out from the holder cover without removing it. It is easier to operate the magnet that is in sliding contact with the holder cover if it is pulled to the rear end.

10, 11 Blades 12, 13 Blade engagement holes 14 Blade tips 20, 21, 25 Blade holders 22, 23, 27 Blade holder engagement holes 30, 35, 37 Blade sliders 40, 41, 43, 45 Holder cover 42, 47 Engagement holes for fulcrum shafts 50, 51 fulcrum shafts 60, 61, 62, 63 Magnet rollers 70, 71, 76 Magnets

Claims (2)

A blade having an engaging hole, a blade holder having an engaging hole, a blade slider for holding the blade at an arbitrary position in the blade holder, and a holder cover for storing the blade holder. A fulcrum shaft for axially attaching the blade holder to the holder cover is provided, and at least a pair of front and rear magnet rollers for urging a member to be cut are provided, and the blade holder is attracted by magnetic force in the direction of the blade edge. Cutter knife to do. A feature is that at least one magnet that is in sliding contact with the holder cover is provided between the blade holder and the cut member, and the cutting force is adjusted by adjusting the force that attracts the blade holder toward the blade edge direction. The cutter knife according to claim 1.

Images