JPH09300274A - Sheet cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet cutting device capable of accurately cutting a sheet such as leather and fabric, and at the same time, maintaining inexpensiveness. SOLUTION: A sheet 30 to be out is held on the upper ends of many sheet support needles 203 supported on a bench 20 via a needle holding sheet 202 made of rubber. A sheet cutter 10, when made to travel on the sheet 30, comes to have a stationary cutting blade 103 horizontally held along the upper surface of the sheet 30 and a movable cutting blade 102 positioned so as to vertically penetrate the stationary cutting blade 103. Also, the cutting edge 102a of the movable cutting blade 102 moves up and down, drawing an elliptical path within a plane vertical to the sheet 30, and cuts the sheet 30 with the stationary cutting blade 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet cutting device for cutting a sheet-like material such as leather or fabric.

[0002]

2. Description of the Related Art When cutting a sheet of leather or a woven fabric having a pattern, the sheet is often cut not only in a straight line but also in a manner to avoid scratches and bend so that the pattern fits. . For this reason, scissors, knives, or punching blade dies (die) are usually used to cut manually. In a special case, a water jet device using ultra-high pressure water instead of a blade may be used.

[0003]

However, as in the prior art, if cutting is carried out manually using scissors or a kitchen knife, even a skilled person takes time and is physically burdensome. There is a problem. In addition, there is also a problem that the size tends to vary.

[0004] On the other hand, the use of a punching blade mold can solve problems such as work efficiency, physical burden on the operator, dimensional accuracy, etc., but the production cost, repair cost, inventory management cost of the mold, etc. However, there is a problem that the economic burden is large. Similarly, when a sheet is cut using a water jet device, the equipment cost of a high-pressure water generation device and the like is enormous, and profitability cannot be achieved unless there is a considerable demand.

Therefore, an object of the present invention is to provide a sheet cutting apparatus which can solve the above problems.

[0006]

To solve the above problems, in the sheet cutting apparatus according to the present invention, a cutting work table for holding a sheet such as leather or woven fabric with a gap on the lower surface side thereof, A sheet cutting machine for cutting a sheet supported on the cutting workbench, the sheet cutting machine is provided with a fixed blade horizontally supported along the upper surface of the sheet and formed on the fixed blade. A movable blade arranged so as to vertically penetrate the fixed blade through a groove formed in the groove, and the blade edge of the movable blade draws a circular or elliptical locus in a plane perpendicular to the sheet. While being moved up and down, a movable blade drive mechanism that drives the movable blade so as to cut the sheet between the fixed blade and the fixed blade is provided.

In the sheet cutting apparatus of the present invention, when the sheet cutting machine is run on a sheet supported with a gap on the lower surface side, the sheet cutting machine horizontally supports the sheet cutting machine along the upper surface of the sheet. Since the fixed blade and the movable blade that moves up and down are provided, the sheet is automatically cut between the fixed blade and the movable blade. Therefore, unlike the case of manually cutting with scissors or a kitchen knife, the sheet can be easily cut without any trouble, the efficiency of the cutting work can be improved, and the time of cutting work can be improved. The physical burden is small. Further, since the sheet cutting machine is a simple sheet cutting machine that does not require a mold or a high-pressure water generator, it does not require a large amount of equipment cost or maintenance cost. Moreover, the movable blade does not move up and down simply but moves up and down while drawing a circular or elliptical locus, so instead of simply pushing the sheet, the blade edge rubs against the lower surface of the sheet to cut it. Go. For this reason, since unnecessary force is not applied to the sheet, the sheet does not laterally shift. Therefore, according to the sheet cutting machine of the present invention, the sheet can be cut with high accuracy because the sheet is sharp and has no lateral deviation. Further, since only the movable blade portion penetrates the sheet in the vertical direction, a small turning is effective.
Therefore, even when the sheet is cut into a right-angled shape, an acute-angled shape, or a curved shape, it can be accurately cut.

In the present invention, as the cutting work table,
A large number of sheet supporting needles and a needle holding portion that elastically holds the base of each sheet supporting needle so that the sheet supporting needle stands upright, and each upper end portion of the sheet supporting needle standing upright, It is preferable to use a sheet having a sheet supporting surface for supporting the sheet to be cut from the lower surface side.

In the cutting work table constructed as described above, the sheet supporting surface formed on each upper end portion of the upright sheet supporting needle is simply covered with the sheet, and the upper end portions of the sheet supporting needle are struck by the weight of the sheet. Cut into the sheet,
The seat is easily and securely supported. When the sheet is cut in this state, the base of the seat supporting needle is elastically held, so even if the movable blade comes into contact with the seat supporting needle, the seat supporting needle is temporarily moved to the side. Lean. Therefore, the seat supporting needle does not hinder the traveling of the movable blade, and when the movable blade passes by, the seat supporting needle returns to the original upright state.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sheet cutting device to which the present invention is applied will be described with reference to the drawings.

FIG. 1 is a side view of a sheet cutting apparatus to which the present invention is applied and a state in which a sheet is cut using the sheet cutting apparatus, and FIG. 2 is provided in a sheet cutting machine in this sheet cutting apparatus. It is explanatory drawing which looked at the part of a fixed blade from above.

In FIGS. 1 and 2, a sheet cutting device 1 is for cutting a sheet 30 such as leather or woven fabric, and a cutting workbench for supporting the sheet 30 in a state in which a gap is secured on the lower surface side. 20 and a sheet cutting machine 1 that automatically cuts the sheet 30 by running the sheet 30 supported in this state along the upper surface thereof.
0.

First, the cutting work table 20 is in a state in which a needle-holding sheet 202 (needle-holding portion) having elasticity such as a rubber sheet is laid on a hard flat base 201 such as wood. A large number of sheet supporting needles 203 are pierced from the back surface side of the needle holding sheet 202 at equal intervals, and each of the sheet supporting needles 203 is in an upright state with its tip end facing upward. As such a sheet supporting needle 203, a normal gold nail or the like can be used. However, since the sheet supporting needle 203 is simply driven into the needle supporting sheet 202, the needle supporting sheet 202 is in a state of elastically supporting the base portion of the sheet supporting needle 203. Therefore, when a force is applied to the seat supporting needle 203 in the lateral direction, the elasticity of the needle holding portion 202 causes the seat supporting needle 203 to fall down obliquely. Return to the upright state.

Here, the many sheet supporting needles 203 are
The tip portions (upper end portions) thereof are located at substantially the same height position, and these tip portions form a sheet holding surface for horizontally holding the sheet 30 to be cut. That is, when the sheet 30 is put on the tip of the sheet supporting needle 203, the tip of the sheet supporting needle 203 slightly digs into the lower surface of the sheet 30 due to its own weight,
The seat 30 is easily and securely held.

The body portion 100 of the sheet cutting machine 10 has a grip portion 110 configured to extend obliquely upward.
And a front case 111 having a built-in electric motor (not shown) at the distal end side of the grip portion 110.

In the sheet cutting machine 10, a fixed blade 103 is horizontally supported on a lower end surface of a front case 111. The fixed blade 103 is slightly bent upward at its end on the cutting direction (indicated by arrow A) so that the fixed blade 103 can run along the upper surface of the sheet 30 made of leather or fabric. As shown in FIG. 2, the fixed blade 103 is formed with a single groove 103a along the cutting direction (indicated by the arrow A), and the groove 103a is a narrow portion protruding at the tip side of the fixed blade 103. It reaches to the tip edge of 103b.

An opening 101a is formed at the lower end of the front surface of the front case 111, and a movable blade mounting member 104 projects from the opening 101a. The movable blade 102 is fixed to the movable blade mounting member 104 by two screws 104a and 104b. This movable blade 1
Reference numeral 02 denotes a thin replacement blade for a cutter knife, which extends diagonally downward from the movable blade attachment 104 through the groove 103a of the fixed blade 103 and penetrates the fixed blade 103 in the vertical direction. The width of the groove 103a of the fixed blade 103 is equal to that of the movable blade 1.
02 is set to the minimum size that can be inserted.

In the sheet cutting machine 10 thus constructed, the base end side of the movable blade mounting member 104 is connected to the movable blade driving mechanism (not shown) formed inside the front case 111.

Since the movable blade drive mechanism is constructed by combining well-known mechanical parts, its illustration and detailed description will be omitted, but the movable blade drive mechanism is an electric motor built in the front case 111. It has a fulcrum-movable crankshaft that drives the movable blade 102 with an alternating current of 100 V and a power consumption of 190 W, and moves the blade edge 102a of the movable blade 102 up and down while drawing an inertial circular trajectory in a plane perpendicular to the sheet 30. Fixed blade 10 by moving
The sheet 30 is cut between the sheet 3 and the sheet 3.

That is, as shown in the enlarged view of the peripheral portion of the movable blade 102 in FIG. 3, the movable blade 102 moves up and down along the locus indicated by the arrow B by the movable blade driving mechanism. Therefore, the movable blade 102 cuts the sheet 30 by rubbing the lower surface of the sheet 30 as it moves upward while drawing an elliptical orbit from the lowermost position, and cuts in conjunction with the traveling of the sheet cutting machine 10. Direction (direction of arrow A)
Move along. Here, when the sheet 30 is cut into a right-angled shape, an acute-angled shape, or a curved shape,
The traveling direction of the sheet cutting machine 10 is changed to a predetermined direction.
During this time, on the lower surface side of the seat 30, as described with reference to FIG. 1, since the base of the seat supporting needle 203 is elastically held by the needle holding seat 202, it is movable to the seat supporting needle 203. Even when the blade 102 contacts, the sheet supporting needle 203 only temporarily tilts to the side. Therefore, the sheet supporting needle 203 is attached to the movable blade 10
The sheet supporting needle 203 returns to the original upright state when the movable blade 102 passes by while not hindering the traveling of the sheet 2. The operation of the movable blade 102 is not limited to the elliptical orbit, and may be a circular orbit. In any case, the cutting edge 1
It may be set such that 02a draws a circular or elliptical locus so that the lower surface of the sheet 30 rubs.

As described above, in the sheet cutting apparatus 1 to which the present invention is applied, the sheet 30 supported by the sheet supporting needle 203 is placed on the cutting work table 20 with a gap being secured on the lower surface side. When the sheet cutting machine 10 travels, the sheet cutting machine 10 is provided with the fixed blade 103 horizontally supported along the upper surface of the sheet 30 and the movable blade 102 that moves up and down. Movable blade 1
The sheet 30 is automatically cut between the sheet No. 02 and the sheet No. 02. Therefore, unlike the case of manually cutting using scissors or a kitchen knife, the sheet 30 can be easily cut without any trouble, and the efficiency of the cutting work can be improved, and the cutting work can be performed. The physical burden of is small. Further, since the sheet cutting machine is a simple sheet cutting machine that does not require a mold or a high-pressure water generator, it does not require a large amount of equipment cost or maintenance cost. Moreover, since the movable blade 102 does not simply move up and down but moves up and down while drawing a circular or elliptical locus, the blade edge 102a rubs against the lower surface of the sheet 30 rather than merely pushing the sheet 30 completely. Since 30 is cut, the sharpness is sharp. Moreover, the width of the groove 103a of the fixed blade 103 is set to the minimum dimension through which the movable blade 102 can be inserted. Therefore, no unnecessary force is applied to the sheet 30, and the sheet 30 does not laterally shift. Therefore, according to the sheet cutting machine 10 of the present invention, the sheet 30 can be cut with high precision because the sheet is sharp and has no lateral deviation.
Further, since only the thin movable blade 102 penetrates the sheet 30 in the vertical direction, a small turn is effective. Therefore, when the sheet 30 is cut linearly, the sheet 30
Since a lateral force is not applied to the sheet, the finished state of the cut surface is good, and the sheet 30 can be cut accurately even when cut into a right angle shape, an acute angle shape, or a curved shape.

For example, the sheet cutting apparatus 1 according to the present invention
The cutting time and the degree of deviation from the reference line (planned cutting line) were compared between the case where the leather and the fabric were cut by the method and the case where the leather and the fabric were cut with scissors as in the conventional case.
In this comparative test, the sheet cutting apparatus 1 according to the present invention is applied.
In, the blade length, width, and thickness of the movable blade 102 (replacement blade of the cutter knife) are 25 mm, 9 mm, and
The width of the groove 103a of the fixed blade 103 is 0.5 mm.
6 mm. The cutting worktable 20 has a vertical dimension, a lateral dimension, and a thickness dimension of 600 mm and 6 mm, respectively.
A needle holding sheet 202 made of a rubber sheet of 00 mm and 3 mm was used, in which 1800 iron nails having a thickness of 0.9 mm and a length of 13 mm were punched in a zigzag manner from the lower surface side.

Table 1 shows a sheet cutting apparatus 1 according to the present invention.
With respect to the cutting with the use of scissors and the conventional cutting with the scissors, a chair leather having a thickness of 1.3 mm is cut along the reference line by 60
The result when cut to 0 mm is shown.

[0024]

[Table 1]

As can be seen from Table 1, in the conventional method of cutting with scissors, the cutting takes an average of 7.7 seconds.
According to the sheet cutting apparatus 1 of the present invention, the cutting time can be shortened to 2.0 seconds on average. Further, in the conventional method of cutting with scissors, the deviation from the reference line is 1.3 mm on average, whereas according to the sheet cutting apparatus of the present invention, the deviation from the reference line is compressed to 0.3 mm. it can.

Table 2 shows a sheet cutting apparatus 1 according to the present invention.
The results obtained by cutting a 1.5 mm thick flat knitted woven fabric (knit) along a reference line by 600 mm are shown for the cutting using the scissors and the conventional cutting using the scissors.

[0027]

[Table 2]

As can be seen from Table 2, the conventional method of cutting with scissors takes an average of 7.1 seconds, whereas
According to the sheet cutting apparatus 1 of the present invention, the cutting time can be shortened to 1.5 seconds on average. Further, in the conventional method of cutting with scissors, the deviation from the reference line is 1.5 mm on average, whereas according to the sheet cutting apparatus of the present invention, the deviation from the reference line is compressed to 0.6 mm. it can.

As described above, in the sheet cutting apparatus 1 of the present invention, it is about 3.8 in comparison with the conventional method of cutting with scissors.
Double cutting speed can be obtained.

A sheet cutting machine 10 to which the present invention is applied
With regard to the above, it is possible to incorporate itself or the side of the cutting workbench 20 into the XY table, and in the case of such a configuration, an automatic cutting machine for a sheet such as leather or fabric can be realized.

[0031]

As described above, in the sheet cutting apparatus of the present invention, when the sheet cutting machine is run on the sheet supported with a gap on the lower surface side, a fixed blade and a movable blade are formed. Sheets are automatically cut between the sheets. Therefore, according to the present invention, it is possible to easily cut the sheet without any trouble and improve the efficiency of the cutting work, and the physical burden when performing the cutting work is small. Further, since the sheet cutting machine is a simple sheet cutting machine that does not require a mold or a high-pressure water generator, it does not require a large amount of equipment cost or maintenance cost. Moreover, since the movable blade does not move up and down simply but moves up and down while drawing a circular or elliptical locus, the blade cuts the sheet while rubbing the lower surface of the sheet. For this reason, since unnecessary force is not applied to the sheet, the sheet does not laterally shift. Therefore, according to the sheet cutting machine of the present invention, the sheet can be cut with high accuracy because the sheet is sharp and has no lateral deviation. Further, since only the movable blade portion penetrates the sheet in the vertical direction, a small turning is effective.
Therefore, even when the sheet is cut into a right-angled shape, an acute-angled shape, or a curved shape, it can be accurately cut.

With respect to the cutting workbench, each upper end portion of the sheet supporting needle bites into the sheet by its own weight only by covering the sheet on the sheet supporting surface formed at each upper end portion of the upright sheet supporting needle. By doing so, the seat is easily and surely supported. When the sheet is cut in this state, the base of the seat supporting needle is elastically held, so even if the movable blade comes into contact with the seat supporting needle, the seat supporting needle tilts to the side. The supporting needle does not hinder the traveling of the movable blade.

[Brief description of drawings]

FIG. 1 is a side view schematically showing a sheet cutting device to which the present invention is applied and a state in which a sheet is cut using the sheet cutting device.

FIG. 2 is an explanatory view of a fixed blade portion provided in a sheet cutting machine in the sheet cutting apparatus shown in FIG. 1, as viewed from above.

FIG. 3 is an explanatory view showing an enlarged periphery of a movable blade in the sheet cutting apparatus shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 sheet cutting device 10 sheet cutting machine 102 movable blade 102a movable blade edge 103 fixed blade 104 movable blade mounting tool 20 cutting work table 201 base 202 needle holding sheet (needle holding section) 203 sheet supporting needle 30 sheet

Claims (2)

[Claims] 1. A cutting workbench for supporting a sheet such as leather or woven fabric on the lower surface side with a gap, and a sheet cutting machine for cutting a sheet supported on the cutting workbench. The sheet cutting machine includes a fixed blade horizontally supported along an upper surface of the sheet, and a movable blade arranged so as to vertically pass through the fixed blade through a groove formed in the fixed blade. The movable blade is movable so as to cut the sheet between the blade and the fixed blade by vertically moving the blade edge of the movable blade in a plane perpendicular to the sheet while drawing a circular or elliptical locus. A sheet cutting device, comprising: a movable blade drive mechanism that drives a blade. 2. The cutting workbench according to claim 1, wherein the cutting worktable has a large number of sheet supporting needles and a needle holding portion elastically holding a base portion of each sheet supporting needle so that the sheet supporting needles stand upright. A sheet cutting device, comprising: a sheet supporting surface of the sheet to be cut by the upper end portions of the upright sheet supporting needles.