WO2012147519A1

WO2012147519A1 - Cutting blade for tape, and tape cutter

Info

Publication number: WO2012147519A1
Application number: PCT/JP2012/059945
Authority: WO
Inventors: 鈴木　秀行
Original assignee: カール事務器株式会社
Priority date: 2011-04-28
Filing date: 2012-04-11
Publication date: 2012-11-01
Also published as: JP2012232349A; JP5467655B2

Abstract

Provided is a cutting blade (10) for a tape, the cutting blade (10) being capable of safely and easily cutting the tape in a straight line. A cutting blade for a tape is configured by providing unit blades (10) at one edge of a planar member (11) having a plate surface extending in the direction in which a tape wound in a roll shape is advanced. Each of the unit blades (10) is composed of: an upper end corner (13) with which the lower surface of the tape is engaged and which makes a cut in the tape; an edge (14) for guiding the cut line in the direction in which the tape is cut; and a recess (15) continuing from the end of the edge. The cutting start points of a cutting edge line (A) formed by the individual edges of the unit blades are shifted from a horizontal line (X), which connects both ends in the width direction, to produce a predetermined contact angle (θ) between the cutting edge line (A) and the tape.

Description

Tape cutting blade and tape cutter

The present invention relates to a tape cutting blade and a tape cutter for cutting a roll-shaped tape into a desired length, and in particular, a tape cutting blade and a tape cutter capable of cutting a tape in a straight line safely and easily. About.

In general, many tape cutters for feeding out and cutting a tape wound in a roll shape such as an adhesive tape are provided with a saw blade-like cutting blade in the cutter portion.
In such a cutting blade, since the cutting line of the tape becomes a saw blade, there is a problem that the appearance when the cut tape is attached to the bonded article is bad. In order to eliminate this inconvenience, there has been proposed a cutting blade in which a blade edge is provided at one end edge of a flat member whose plate surface extends along the direction in which the tape is fed out.

For example, in Patent Document 1, the edge of a steel plate that extends along the direction in which the tape is fed out is engaged with a corner portion where the tape is locked to make a cut, and the cut is guided in a direction to cut the cut. By providing a plurality of unit blades each having an edge portion and a recessed portion continuing from the end as a unit, and by configuring the edge portions of each unit blade to be in a straight line, the tape is directed in the width direction. Tape cutting blades that can be cut linearly have been proposed.

JP 2010-30031 A

However, since the edge portion of the cutting blade described in Patent Document 1 is positioned on a straight line, it is necessary to pull the tape while twisting it in order to cut the tape in a straight line.
For this reason, when the tape is pulled straight down to be cut, it is necessary to apply a high stress to the tape end portion at the start of cutting, and there is a risk that the hand touches the cutting blade excessively.

Accordingly, an object of the present invention is to provide a tape cutting blade that can be cut safely and easily in a straight line, and a tape cutter to which the tape cutting blade is attached.

In order to solve the above-mentioned problems, the present invention makes a cut by locking the lower surface of the tape to one end edge of a flat member extending in the direction along which the tape wound in a roll shape is fed out. It is configured by providing a plurality of unit blades each having an upper end corner, an edge leading in a direction to cut a cut line by the upper end corner, and a depressed portion continuous from the end of the edge. A cutting edge for a tape, wherein the cutting edge line constituted by the edge portion of each unit blade has at least a starting end portion of the cutting biased with respect to a horizontal line connecting both ends in the width direction of the planar member, A predetermined contact angle is generated between the tape and the tape.

The tape cutter according to the present invention has a reel portion on which a tape wound in a roll shape is mounted, and a cutting portion provided at a position away from the reel portion by a predetermined distance. The fed tape is cut by the attached tape cutting blade.

According to the present invention, when the tape fed along the flat member is cut at the cutting edge at the tip, first, the tape is cut by the upper end corner of the unit blade, and the tape is cut by being directed by the edge. The tape is cut by repeating the process of tearing along the line and further cutting by the upper end corner of the adjacent unit blade. At this time, at least the starting end of the cutting edge line formed by the edge portions of the plurality of unit blades is deviated with respect to the horizontal line connecting both ends in the width direction of the planar member, and a predetermined contact angle with the tape is present. Because it is configured to occur, it can be cut simply by pulling straight down without twisting the tape, and even if the hand is clumsy, the tape can be cut safely and easily in a straight line it can.

It is a perspective view which shows the cutting blade for tapes concerning embodiment of this invention. It is a perspective view which shows the tape cutter provided with the said cutting blade. The cutting edge line of the said cutting blade is shown, (a) is a top view, (b) is a front view. The contact angle in the contact point of the said cutting blade is shown, (a) is a schematic front view, (b) is the enlarged view. It is a perspective view which shows an example of the manufacturing process of the said cutting blade. It is a principal part perspective view which shows an example of the cutting blade for tapes manufactured with the said manufacturing method. It is a perspective view which shows the use condition of the said cutting blade. The 1st modification of the said cutting blade is shown, (a) is a top view, (b) is a front view. The 2nd modification of the said cutting blade is shown, (a) is a top view, (b) is a front view. The 3rd modification of the said cutting blade is shown, (a) is a top view, (b) is a front view. The 4th modification of the said cutting blade is shown, (a) is a top view, (b) is a front view. The 5th modification of the said cutting blade is shown, (a) is a top view, (b) is a front view. The 6th modification of the said cutting blade is shown, (a) is a top view, (b) is a front view. The 7th modification of the said cutting blade is shown, (a) is a top view, (b) is a front view. It is a perspective view which shows the 8th modification of the said cutting blade. It is a perspective view which shows the tape cutter provided with the cutting blade which concerns on the said modification. The 9th modification of the said cutting blade is shown, (a) is a top view, (b) is a front view. It is explanatory drawing which shows the contact angle in the said modification, (a) is a top view which shows a horizontal contact angle, (b) is a front view which shows a vertical contact angle, (c) is a relationship with an approach angle. FIG. The 10th modification of the said cutting blade is shown, (a) is a top view, (b) is a front view. The 11th modification of the said cutting blade is shown, (a) is a top view, (b) is a front view.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. In addition, embodiment is not limited to the following forms, Other aspects can also be implemented if the subject of this invention can be solved.

FIG. 1 is a perspective view showing a cutting blade 10 for tape according to the present embodiment.
As shown in FIG. 2, the cutting blade 10 is used by being attached to a tape cutter 2 for feeding and cutting the adhesive tape 1.
The tape cutter 2 includes a reel 3 around which the adhesive tape 1 is wrapped, and a cutting portion 4 that protrudes from the reel 3 at a predetermined distance.

As the adhesive tape 1 mounted on the reel 3, for example, an adhesive is applied to the lower surface of a sheet made of a film material such as cellophane, aluminum foil, polyvinyl chloride, OPP (biaxially oriented polypropylene), acetate, etc. What is wound around is generally used.
The cutting blade 10 for tape according to the present embodiment is disposed at the upper end of the cutting portion 4 of the tape cutter 2 with the cutting edge directed in the lateral direction (that is, the direction in which the tape is fed). The drawn-out adhesive tape 1 is cut with a cutting edge at its tip.

Hereinafter, the structure of the cutting blade 10 will be described.
The cutting blade 10 of this embodiment is provided with a cutting edge at one end of a steel plate 11 as a flat member and a temporary fixing portion 20 for temporarily fixing a tape at the other end (the temporary fixing shown in the figure). Part 20 is exaggerated).

As shown in FIG. 3, the cutting edge of the cutting blade 10 is configured by arranging a plurality of unit blades 12 at equal intervals.
The unit blade 12 engages with the lower surface of the tape 1 and has an upper end corner portion 13 into which a cut is made, and a straight shape that is continuous from the upper end corner portion 13 and leads in a direction to cut a cut line by the upper end corner portion 13. The edge portion 14 and the recessed portion 16 continuous from the end corner portion 15 of the edge portion 14 are taken as one unit, and the

edge portions

14, 14,... Of each

unit blade

12, 12,. Are arranged at equal intervals so as to be positioned on one curve.

A cutting edge line A for cutting the tape 1 is formed by these

edge portions

14, 14..., And this cutting edge line A connects both ends in the width direction of the steel plate 11 at least at the starting end portion of the cutting. It is designed to be biased with respect to the horizontal line X.
That is, the

respective edge portions

14, 14... Constituting the cutting edge line A are positioned on the deflection line that curves so as to protrude downward with respect to the horizontal line X.

In this case, as shown in FIG. 3 (b), the cutting line A is configured as an arcuate curve in which the portion that protrudes most downward (that is, the concave lowest point) is located at the center. desirable.
The blade edge line A is positioned on the horizontal line X in plan view without being biased in the horizontal direction (that is, the direction Z in which the tape is fed out) with respect to the horizontal line X connecting both ends in the width direction of the steel plate 11 (see FIG. 3 (a)).
When the tape 1 is brought into contact with such a blade edge, a design is made such that a predetermined contact angle θ is generated between the blade edge line A and the horizontal line X at the contact point P (that is, the starting end portion of the cutting) (FIG. 4).

In this case, it is preferable that the contact angle θ with the tape 1 at the starting end of the cutting is designed to be 4 to 15 degrees (preferably 6 to 15 degrees). This is because when the contact angle θ is smaller than 4 degrees, a large force is required for cutting the tape. By making the contact angle 6 degrees or more, it becomes possible to cut with a light force. However, if the contact angle θ is greater than 15 degrees, the linearity of cutting is impaired, which is not preferable.
In addition, the start end part of a cutting | disconnection is a site | part assumed that the tape 1 contacts first at the time of a cutting | disconnection. Since the width of the cutting blade 10 is designed in accordance with the tape width, the width of the steel plate 11 is taken into consideration and the predetermined region including the first contact point P (in the case of the drawing, the side in the width direction of the steel plate 11). The predetermined region including the end portion is referred to as “starting end portion of cutting”.

A protruding portion 17 that protrudes upward from the plate surface is provided across the width direction of the steel plate 11 at the end opposite to the blade edge.
The projecting portion 17 is a part that functions as a temporary fixing portion 20 for temporarily fixing the fed tape 1, and the temporarily fixed tape 1 is 2.5 ° to 10 ° with respect to the plate surface of the steel plate 11. The length reaching the blade edge and the height H thereof are designed so as to reach the blade edge with an approach angle Φ of the degree (see FIG. 1).

The cutting blade 10 is formed by a manufacturing process as shown in FIG.
First, a plurality of substantially rectangular recesses 18 are formed on the upper surface of the long steel plate 11 in the width direction. In this case, the concave portion 18 may be formed by pressing so that the back side of the depressed portion 16 becomes convex as shown in FIG.
Next, the steel plate 11 is cut in the width direction from the lower surface side toward the upper surface direction B along the recess 18.

Then, the upper surface of the steel plate 11 is curved downward so as to face downward. Thereby, the edge part 14 of each unit blade 12 can be located on the deviation line which deviates concavely with respect to the horizontal line X.
Alternatively, after the steel plate 11 is cut in the width direction from the lower surface side toward the upper surface direction B, the recessed portion 16 may be formed along the cut surface, and the upper surface of the steel plate 11 may be curved in a concave shape downward. .

The temporary fixing portion 20 is formed by bending the end portion of the steel plate 11 on the side where the blade edge is not formed, in an inverted V shape, upward. In this case, the projecting portion 17 includes an upright piece 17a that rises substantially orthogonally from the plate surface of the steel plate 11, and a mountain-shaped temporary fix that bends in a substantially inverted V shape from the upper end to the rear end side of the upright piece 17a. It is preferable that it is constituted by the piece 17b.

By providing a temporary fixing portion 20 for temporarily fixing the tape 1 at a position that is not on the same plane as the plane on which the cutting edge is provided, the tape 1 is brought to the cutting edge with a predetermined entry angle Φ. And the linearity of cutting can be further enhanced (see FIG. 1).
The height H of the temporary fixing portion 20 is set so that the temporarily fixed tape 1 reaches the cutting edge with an entry angle Φ of 2.5 degrees to 10 degrees (preferably 2.5 degrees to 7.5 degrees). It shall be designed. The distance from the temporary fixing portion 20 to the blade edge is the above-mentioned optimum so that the height H of the temporary fixing portion 20 is about 0.5 to 3.0 mm (preferably about 0.8 to 1.5 mm). Design in consideration of the approach angle Φ.

By cutting the steel plate 11 from the lower surface side toward the upper surface direction B, the cutting edge line A is formed, so that a slightly upward burr 19 can be generated at the edge portion 14. Thereby, the unit blade 12 can be made sharper.
The length N of the unit blade 12 is preferably about 0.2 mm to 1.0 mm.
The depth W of the depression 16 is preferably about 0.03 to 0.5 mm (desirably about 0.05 to 0.15 mm). This is because if it is smaller than 0.03 mm, it becomes difficult to make a cut with the blade edge, and if it is larger than 0.5 mm, the linearity of cutting is lowered.

Next, the use state of the cutting blade 10 will be described with reference to FIG.
First, the adhesive tape 1 is pulled out to the front of the cutting blade 10, fixed by the temporary fixing portion 20, and then locked to the blade edge (see FIG. 7A). Then, the drawn tape 1 is pulled straight in the downward direction C without twisting.
Then, the tape 1 comes into contact with the upper end corner portion 13 of the unit blade 12 to cause cutting (see FIG. 7B). When the tape 1 is further pulled in the downward direction C, it is crooked by the edge portion 14 connected to the upper end corner portion 13, cut along the cut line, and further cut by the upper end corner portion 13 of the adjacent unit blade 12. .

By repeating this, the tape 1 can be cut in a straight line in the width direction.
As described above, the unit blade 12 is cut at the upper end corner portion 13 and further cut at the adjacent upper end corner portion 13 while being oriented in the cutting direction (that is, the tape width direction) by the edge portion 14. In this case, the cutting end of the cutting edge line A is biased with respect to the horizontal line X connecting both ends of the steel plate 11 in the width direction. The tape 1 can be cut linearly in the width direction without being twisted (that is, just pulled straight downward).

In particular, the tape 1 fed out from the reel 3 is fixed at the temporary fixing portion 20 projecting upward, and then reaches the blade edge with a predetermined entry angle Φ, so that only the edge portion 14 of the blade edge has an adhesive surface of the tape 1. Can be brought into contact with each other, and is cut along the cutting edge line A.
That is, since the adhesive surface of the tape 1 does not adhere around the depressed portion 16, it is not cut according to the uneven shape of the blade edge.

Further, as long as the cut at the upper end corner portion 13 of the unit blade 12 is provided at the starting end portion of the cutting, the tape 1 will be torn along the cutting edge line A only by the creasing by the edge portion 14 after that, Even when the edge portion 14 is worn due to long-term use, straight cutting in the width direction is possible.

In the cutting blade 1 for tape according to the present embodiment, a cutting strength test and a practicality test were performed in order to obtain the optimum value of the contact angle θ.
The cutting strength test is a test for examining the necessity of twisting and the force (cutting load) required for cutting, and the practicality test is a test for examining linearity of cutting.
First, the method and results of the cutting strength test will be described.

In a tape cutting blade having a unit blade length of 1.0 mm (the edge portion is 0.5 mm and the depressed portion is 0.5 mm), the contact angle θ at the starting end portion of the cutting edge line A is 0 degree (Patent Document 1). Mode), 3 degrees (curvature radius R = 143 mm), 4 degrees (curvature radius R = 100 mm), 6 degrees (curvature radius R = 65 mm), 8 degrees (curvature radius R = 45 mm),
10 degrees (curvature radius R = 40 mm), 15 degrees (curvature radius R = 30 mm), 20 degrees (curvature radius R = 20 mm), 30 degrees (curvature radius R = 15 mm), 45 degrees (curvature radius R = 10 mm) The cutting performance was investigated.
Cutting performance was determined by measuring the initial cutting strength (N) and evaluating the use by the subject.

The initial cutting strength was evaluated based on the load value when the tape continued to be applied and the tape started to break. For the measurement of the load value, a universal tensile tester (“Tensilon (trade name)” manufactured by A & D) was used.
As a result of the questionnaire to 30 subjects, the usage evaluation was “unable to cut without twisting (×)”, “although it requires a large force, it can be cut without twisting (Δ)”, “ The answer that was most common among “Can be cut without applying (○)” and “Can be cut with very light force (◎)” was adopted.

As the adhesive tape, a 15 mm wide polyester tape (553H) manufactured by Nichiban Co., Ltd. was used.
Table 1 shows the results.

As is apparent from the above table, when the contact angle at the starting end of the cutting edge line A is 0 degree, the tape slips on the cutting blade, so that cutting is impossible unless twisted.
If the contact angle is greater than 0 degree and less than 4 degrees, cutting is possible without twisting, but a large force is required to start cutting.
On the other hand, when the contact angle was 4 degrees or more and less than 6 degrees, cutting was possible without applying a large force.
When the contact angle was 6 degrees or more, cutting was possible with a very light force.

From the above results, in order to cut without twisting, it is necessary to design the contact angle θ with the tape 1 at the starting end of the cutting to be 4 degrees to 15 degrees. In order to cut, it was confirmed that it is desirable to design at 6 to 15 degrees.
Next, as a practicality test, when the contact angle θ is 6 degrees (Example 1), 10 degrees (Example 2), and 15 degrees (Example 3) It was investigated whether it was optimal in linearity. As Comparative Example 1, one having a contact angle of 0 degree (that is, the blade line A does not deviate) and one having a contact angle θ of 20 degrees between the tape and the cutting blade were prepared.

For 30 subjects, the linearity when the tape was pulled downward (that is, the direction perpendicular to the feeding direction) and cut was determined as “satisfied (◯)”, “slightly unsatisfactory (Δ)”, “unsatisfied ( X) ”was evaluated in three stages. Table 2 shows the number of responses.

In any of Examples 1 to 3, a majority of subjects answered that they were satisfied with the linearity of cutting. In particular, when the contact angle θ was 6 degrees, very high satisfaction was obtained.
On the other hand, the cutting blade (Comparative Example 1) in which the cutting edge line A is not biased cannot be cut unless it is twisted.
From the results of both the cutting strength test and the practicality test, it was found that the larger the contact angle θ of the tape, the easier it can be cut with a light force, while the linearity is impaired when the contact angle θ exceeds 15 degrees. .

From both test results, the cutting edge line A that satisfies both the cutting property and the linearity is a deviation line having a contact angle θ with respect to the horizontal line X in the range of 4 to 15 degrees, preferably in the range of 6 to 15 degrees. It was confirmed that this was a bias line.
In consideration of the linearity of cutting, it is preferable that the difference in height between the contact point P and the lowest point is as small as possible. For example, in the case of a cutting blade manufactured for a 15 mm wide tape, the height of the tape end and the lowest point when the contact angle θ is designed to be 15 degrees (curvature radius R = 30 mm) is 0.95 mm. Therefore, it can be said that the height difference between the contact point P and the lowest point is preferably at least less than 1.0 mm.

In addition, in this embodiment, like the cutting blade 10A for tapes shown in FIG. 8, the blade edge line A is a curve (parabola, quadratic curve) in which the lowest point is at a position shifted from the center in the width direction. You may design so that it may become.
Moreover, you may design so that the blade edge line A may become a substantially V-shaped deviation line like the cutting blade 10B for tapes shown in FIG. Thus, if the cutting edge line A is configured to be linearly deviated with respect to the horizontal line X connecting both ends of the steel plate 11 in the width direction, the contact angle θ can always be made constant, so that the cutting strength, etc. The cutting effect can be made constant.

In the tape cutting blade 10B of this embodiment as well, in consideration of the linearity of cutting, it is preferable that the difference in height between the contact point (that is, the starting end portion of cutting) and the lowest point is as small as possible.
That is, in the case of a cutting blade manufactured for a tape having a width of 15 mm, the height between the tape end and the lowest point when the contact angle θ is designed to be 15 degrees is 2.01 mm. It can be said that the difference in height between the point and the lowest point is preferably at least less than 2.1 mm.

Further, like the cutting blade for tape 10C shown in FIG. 10, the cutting edge line A is designed to be a convex deviation line protruding upward with respect to the horizontal line X connecting both ends of the steel plate 11 in the width direction. Also good.
In this case, the center of the cutting line A may be an inverted U-shaped curved line that becomes the uppermost point, or a bias having the uppermost point at a position shifted from the center, such as the cutting blade for tape 10D shown in FIG. It may be a line. Alternatively, it may be an inverted V-shaped deviation line.
In these embodiments, the uppermost point at the center is the contact point of the tape 1 at the time of cutting. Similarly, in this case, the contact angle θ with respect to the horizontal line X is generated at the starting end of the cutting. Designed.

Further, like the cutting blade for tape 10E shown in FIG. 12, the cutting edge line A is designed to be a corrugated deviation line in the vertical direction with respect to the horizontal line X connecting both ends of the steel plate 11 in the width direction. May be.
In this case, as shown in the figure, the arcuate line portion projecting downward with respect to the horizontal line X and the arc line portion projecting upward may be formed into a continuous wave shape, or the tape cutting shown in FIG. Like the blade 10F, a zigzag shape in which a V-shaped line portion and an inverted V-shaped line portion are continuous may be used.

Moreover, in this embodiment, as shown in FIG. 14, it is good also as a structure which does not provide a temporary fix | stop part. As shown in FIG. 15, this tape cutting blade 10G is preferably applied to a tape cutter 2 in which a temporary fixing portion 6 of the tape 1 is provided in advance.
That is, the cutting part 4 of the tape cutter 2 is provided with a portion protruding upward (temporary fastening part 6), and the cutting edge is temporarily attached to the installation surface provided through the valley part 5 slightly depressed. The tape cutting blade 10G is attached in a state facing in the reverse direction.

In this tape cutting blade 10G, the cutting edge line A is also deviated with respect to the horizontal line X connecting both ends in the width direction of the steel plate 11 and the predetermined contact angle θ between the tape cutting blade 10G and the tape 1 is the same. Is designed to be provided.
Moreover, in this embodiment, like the cutting blade 10H for tapes shown in FIG. 16, the cutting edge line A is transverse to the horizontal line X connecting both ends in the width direction of the steel plate 11 (that is, the front-rear direction with respect to the cutting edge). ) May be biased.
In this case, as shown in the figure, a structure that does not deviate in the vertical direction may be used, or a structure that deviates in the vertical direction as shown in FIGS.

In the case where the cutting edge line A is biased in the vertical direction with respect to the horizontal line X and also in the lateral direction, the center of the cutting edge line A is like the cutting blade for tape 10J shown in FIG. Designed so that the

edge portions

14, 14... Of the

unit blades

12, 12,... Are arranged on an arc that protrudes downward Y with respect to the plate surface and protrudes in the tape drawing direction Z. It is preferable to do this.
Also in this embodiment, the cutting edge line A is designed so that the contact angle θ with respect to the horizontal line X is 4 degrees to 15 degrees (preferably 6 degrees to 15 degrees).

The contact angle θ with respect to the horizontal line X can be decomposed into a component directed in the vertical direction (vertical direction) and a component directed in the horizontal direction (lateral direction) with respect to the horizontal line X. Thus, the angle toward the downward direction Y (that is, the vertical contact angle θy) is 4 to 15 degrees, and the angle toward the tape drawing direction Z (that is, the horizontal contact angle θz) is 2.5 to 10 degrees. Is preferably designed (see FIG. 18).

In particular, the horizontal contact angle θz is designed in consideration of the height H of the temporary fixing portion 20 and the distance from the cutting edge to the temporary fixing portion 20, and as shown in FIG. It is preferable to design the tape 1 so as to be substantially the same as the approach angle Φ reaching the blade edge in order to ensure the linearity of cutting.
In order to obtain the optimum value of the approach angle Φ to the blade edge, the provisional angle Φ is assumed to be 0 degree, 2.5 degrees, 5 degrees, 7.5 degrees, 10 degrees, 15 degrees, and 20 degrees. Samples having different heights H of the stoppers 20 were prepared, and “sliding on the blade” and “cutting linearity” of each cutting blade were evaluated.

In this case, the horizontal contact angle θz at the starting end portion of the cutting edge line A was 4 degrees (curvature radius R = 100 mm).
The results are shown in Table 3.

From the above results, it was confirmed that it is preferable to design the height and the like of the temporary fixing portion 20 so that the approach angle Φ to the blade edge is about 5 degrees.
Next, in order to obtain the optimum value of the horizontal contact angle θz with the approach angle Φ being 5 degrees, 0 degrees, 3 degrees (curvature radius R = 143 mm), 4 degrees (curvature radius R = 100 mm), 6 degrees (Curvature radius R = 65 mm), 8 degrees (curvature radius R = 45 mm),
10 degrees (curvature radius R = 40 mm), 15 degrees (curvature radius R = 30 mm), 20 degrees (curvature radius R = 20 mm), 30 degrees (curvature radius R = 15 mm), 45 degrees (curvature radius R = 10 mm) Samples were prepared and the cutting performance of each was evaluated.

The evaluation of the linearity of the cutting is based on the results of a questionnaire survey of 30 subjects, and is the highest among “bad (×)”, “slightly good (△)”, “good (○)”, “very good (◎)”. Many answers were adopted.
Table 4 shows the results.

As apparent from the above table, the cutting edge line A of the cutting blade 10 is preferably designed so that its horizontal contact angle θz is substantially the same as the approach angle Φ to the cutting edge, and its value is 2.5. It has been confirmed that it is preferable to design at a degree of 10 degrees (preferably 4 degrees to 7.5 degrees).
In addition, in this modification, it is good also as the V-shaped cutting edge line A comprised by the straight line like the cutting blade 10K for tapes shown in FIG. In this way, cutting effects such as cutting strength can be made constant.

Further, as an example in which the cutting edge line A is deviated laterally with respect to the horizontal line X, an aspect in which the tape 1 is recessed in a direction opposite to the direction in which the tape 1 is fed out is possible, as in a cutting blade 10L for tape shown in FIG. is there. However, the cutting blade for tape 10K is inferior in cutting linearity as compared with other embodiments.
In FIG. 1 and FIGS. 16 to 20, for convenience, the biased state of the cutting edge line A with respect to the horizontal line X is displayed using the width direction side end of the steel plate 11 as the starting end of cutting, but the portion where the tape 1 actually contacts (In other words, as shown in FIG. 4, it is preferable to design the starting end portion at a portion slightly inside from the width direction end portion of the steel plate 11).

In the above embodiment, the cutting blade for the adhesive tape has been described. However, the cutting blade in the present invention is a cutting for cutting a tape having no adhesiveness such as a food wrap film, an aluminum foil, or a wide tape. It can also be applied to blades.

The present invention can be applied to tape cutting blades and tape cutters used in all industrial fields. *

DESCRIPTION OF SYMBOLS 1 ... Tape 2 ... Tape cutter 3 ... Reel (reel part)
4 ... cutting

part

10, 10A to 10H, 10J to 10L ... cutting blade (cutting blade for tape)
11 ... Steel plate (planar member)
12 ... Unit blade 13 ... Upper end corner 14 ... Edge 15 ... Corner 16 ... Depressed part 17 ... Projection 20 ... Temporary fastening part A ... Cutting edge line X: horizontal line connecting both ends in the width direction of the cutting blade θ contact angle θy vertical contact angle θz horizontal contact angle φ entrance angle P contact point (start of cutting) Part)

Claims

The upper end corner where the lower surface of the tape (1) is engaged with the one end edge of the flat member (11) whose plate surface extends along the direction in which the tape (1) wound in a roll shape is fed out, and a cut is made. (13), an edge portion (14) that leads in a direction to cut a score line by the upper end corner portion (13), and a depressed portion (15) continuous from the end of the edge portion (14). A cutting blade for tape (10) configured by providing a plurality of unit blades (12) as one unit,
The cutting edge line (A) constituted by the edge portions (14, 14...) Of the respective unit blades (12, 12...) Has at least a cutting start end portion (P), and the planar member (11). ) With respect to the horizontal line (X) connecting both ends in the width direction of the tape, and a predetermined contact angle (θ) between the tape and the tape (1) is formed. blade.
The tape cutting blade according to claim 1, wherein the cutting edge line (A) is curved or bent so that an intermediate portion protrudes downward (Y) with respect to the plate surface.
The cutting blade for tape according to claim 1 or 2, wherein the cutting edge line (A) is curved or bent so that an intermediate portion protrudes in a tape drawing direction (Z).
The cutting edge line (A) is bent or curved so that the center protrudes downward (Y) with respect to the plate surface and protrudes in the tape drawing direction (Z). The tape cutting blade according to claim 3.
The tape cutting blade according to any one of claims 1 to 4, wherein the contact angle (θ) is 4 degrees to 15 degrees.
The contact angle (θ) is a combination of a vertical contact angle (θy) directed downward (Y) with respect to the horizontal line (X) and a horizontal contact angle (θz) directed toward the tape drawing direction (Z). The vertical contact angle (θy) is an angle of 4 degrees to 15 degrees, and the horizontal contact angle (θz) is an angle of 2.5 degrees to 10 degrees. The tape cutting blade according to claim 4.
A reel portion (3) to which a tape (1) wound in a roll shape is mounted; and a cutting portion (4) provided at a predetermined distance from the reel portion (3). It is a tape cutter (2) which cut | disconnects the tape (1) paid out by the cutting blade (10) attached to the part (4), Comprising: The said cutting blade (10) is a direction where a tape (1) is drawn out. An upper end corner portion (13) for engaging the lower surface of the tape (1) with one end edge of the flat member (11) extending along the plate surface along the upper edge corner, and a cut line formed by the upper end corner portion (13). Are provided with a plurality of unit blades (12) each having an edge portion (14) leading to the direction of cutting and a recessed portion (15) continuous from the terminal end of the edge portion (14). It is comprised by the said edge part (14) of a unit blade (12) At least a cutting start end (P) of the cutting edge line (A) is deviated with respect to a horizontal line (X) connecting both ends in the width direction of the planar member (11), and a predetermined gap is provided between the cutting edge line (A) and the tape (1). A tape cutter configured to generate a contact angle (θ).
The tape (1) has an adhesive applied to the lower surface,
After the tape (1) that has been fed out is temporarily fixed at the temporary fixing portion (20) positioned above the plate surface of the planar member (11), the tape (1) is 2 with respect to the plate surface of the planar member (11). The tape cutter according to claim 7, wherein the tape cutter is configured to have an approach angle (Φ) of 5 degrees to 10 degrees.
The edge line (A) is bent or curved so that the center protrudes downward (Y) with respect to the plate surface and protrudes in the tape drawing direction (Z),
The horizontal contact angle (θz) toward the drawing direction (Z) of the tape (1) at the contact angle (θ) is designed to be substantially the same as the approach angle (Φ). 8. The tape cutter according to 8.