JPS62259793A - Method and device for cutting thin band body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method and apparatus for cutting a ribbon.

More specifically, the present invention provides audio cassettes, professional video, home video, digital computer tape,
A thin strip of plastic film, paper, etc., such as photographic film, photosensitive film, typewriter ribbon, etc. is subjected to processing such as drying, coating, curing, etc., and then wound onto a winding device. A method and device for cutting a thin strip that enables winding of a thin strip being wound around an empty winding core without stopping the running of the thin strip and continuing winding for M times, the thin strip having a thickness of 3 to 20 μm. degree, especially 3 to 10μ, especially 3
The present invention relates to a method and apparatus effective for cutting extremely thin ribbons of about 5 μm.

[Conventional technology]

When cutting a thin thin ribbon with a cutting knife, if the blade is only pressed against the ribbon, the cut will be poor, i.e. the edge of the ribbon will be cut at the moment the cutting knife hits the end. It may bend and may not cut properly.

In order to solve such problems, Jitsuma 8849-86
Publication No. 492 discloses that two blades are provided intersectingly through a knife stand on a movable table that is moved by a chain or a feed screw, and the biting action of the two blades is performed at the beginning of cutting into the ribbon. A cutting device is disclosed.

(Problems to be Solved by the Invention) In this device, no particular consideration is given to the relationship between the direction of action of the cutting force of the blade and the running direction of the ribbon. Even if good cutting is possible due to the biting action of the two blades at the start of cutting, tension fluctuations in the ribbon between the winding core and the guide roll and tension between the winding core and the ribbon may occur. Even if the running position of the ribbon body changes slightly up and down relative to the blade during cutting due to fluctuations in the friction coefficient, the cutting force of the blade will act in the opposite direction to the running direction of the ribbon body. For this reason, the cut surface may become jagged and may not be cut well.

Furthermore, in the conventional device described above, the cutting blade is moved by an endless chain or a feed screw attached to a chain ring, so that the cutting speed cannot be sufficiently increased. For this reason, when the moving speed of the strip is increased, the cut surface of the strip becomes largely inclined in its longitudinal direction. When the cut surfaces of a strip cut at an angle are wound around a winding core, the cut surfaces overlap many times. For this reason, when the strip is a thin film, there is a problem in that the film wound on the core becomes wrinkled, which significantly lowers the product hygiene value.

In addition, in the conventional device described above, the two blades provided on the knife stand perform a biting motion and return to their original state at specific times during the cutting operation, that is, at the start of the cut and at the completion of the cut. , control photography is required, which also makes it difficult to increase the speed.

In view of the above-mentioned problems, an object of the present invention is to provide a method and apparatus that can reliably gluing a thin ribbon material.

[Means for solving problems]

In the present invention, as a method for cutting a thin strip running from a winding core to a guide roll, a cutting blade is inclined with respect to the thin strip, and a cutting blade is connected to the cutting blade and the thin strip is separated from the cutting blade. Using a blade equipped with a guide surface that applies a force in the direction of the cutting blade to the ribbon when the blade is positioned, cut the ribbon so that the cutting force by the cutting blade of the blade always acts in the running direction of the ribbon during cutting. A method of cutting a ribbon body is provided that involves moving a knife relative to the body.

Furthermore, in the present invention, as a device for cutting the ribbon by moving the cutting blade from one end face of the ribbon body to the other end face (toward the other end face) between the winding core and the guide roll, the cutting blade is configured to cut the ribbon body. The side surface on the cutting side of the thin strip is formed by two sides that intersect in a dogleg shape, and the cutting force is applied to the thin strip toward the guide roll from the inner core of the two sides extending from the dogleg shaped recess. A cutting blade is formed on one side to be acted on, and there is no cutting blade on the other side.
The thin strip body is formed as a strip guide surface, one side on which the cutting blade is formed faces the steady running area of the thin strip body, and the recess is located outside the steady running area of the thin strip body. A cutting device is provided.

[Function] In the method of the present invention, when cutting the thin strip running from the winding core to the guide roll, the thin strip is cut so that the cutting force by the cutting blade of the knife always acts in the running direction of the thin strip during cutting. By moving the knife relative to the body, the influence of tension fluctuations during cutting is reduced and the cut end surface is prevented from becoming jagged.

Moreover, the present invention includes a cutting blade that is inclined with respect to the ribbon body, and a guide surface that is connected to the cutting blade and applies a force in the direction of the cutting blade when the ribbon body is positioned away from the cutting blade. In other words, the side surface on the cutting side of the thin strip is formed by two sides that intersect in a dogleg shape, and the belt runs from the outer winding core of the two sides extending from the four parts of the dogleg shape to the guide roll. A cutting blade is formed on one side that applies a cutting force to the body, and the other side has no cutting blade and is formed as a guide surface for the ribbon. The recess is located outside the steady running range of the thin strip body.

With this configuration, the running position of the ribbon during cutting can be changed due to fluctuations in the tension of the ribbon between the winding core and the guide roll or fluctuations in the coefficient of friction between the winding core and the ribbon. Even if the thin strip moves up and down with respect to the cutter and the thin strip comes to the guide surface of the cutter, the thin strip will be pushed toward the cutting blade by the guide surface of the cutter and the cutting blade will always cut the thin strip. The band is cut.

For this reason, the cutting force of the blade does not act in the direction opposite to the running direction of the thin strip, and the cutting force of the cutting blade of the knife always acts in the running direction of the thin strip during cutting. The band can be cut well.

In addition, in the present invention, the cutting blade can be attached to a lightweight flexible belt such as a timing belt instead of a heavy chain like the conventional device described above. The bite between the two blades of a knife i! ]
There is no need to perform cutting, and it is possible to use the machine in the field, and the steady cutting speed can be significantly increased compared to the above-mentioned chain-based device.Furthermore, since it is lightweight, the time required to increase the speed to the steady cutting speed can be shortened. , it is applicable to a high-speed processing device for strip-shaped materials.

〔Example〕

Hereinafter, the present invention will be described in detail based on the illustrated embodiments.

In FIG. 2, for example, an unwind device (not shown)
A thin strip F of plastic film, paper, etc., which has been unwound and subjected to desired treatments such as drying, coating, curing, etc. using an appropriate means such as a coater (not shown), is
The idle roller 1 is rotatably supported on a machine frame (not shown), and is wound around a winding core 3' that is rotatably supported on a roll support arm 2. Note that the guide roller 1 may be configured as a tension roller for detecting the tension of the ribbon and adjusting the winding speed.

The roll support arm 2 is rotatably supported on a support shaft 2a, and the winding is carried out in a second view by a rotation means (not shown) of a known structure connected to the roll support arm 2. It is rotated half a turn counterclockwise as shown.

The winding is carried out using winding cores 3.3' at both ends of the roll support arm 2.
It is rotatably supported. Each winding core 3.3' may be driven by transmitting force to a part of the center, or it may be driven by the winding core or the surface portion of the ribbon wound thereon.

In order to detect the amount of winding of the thin strip F wound on the winding core 3', the outer diameter of the winding core 3' is determined by a sensor (not shown). Count the length of body F (
(not shown) etc., or the winding time of the thin strip F is determined by a timer (not shown). When it is detected that the winding of the thin strip F on the winding core 3' has reached a predetermined length j, the winding is performed by rotating the roll support arm 2 around the support shaft 2a by rotating means, as shown in FIG. Rotate and
Replace core 3' with core 3.

Next, the thin strip F can be wound around a new winding core 3 by the method shown in FIG.

That is, the pair of inverted arms 4 have their lower ends rotatably supported by a support shaft 4a, and their upper ends are supported by a support shaft 4a.
The books are connected by parallel fixed shafts 5a and 6a (FIG. 1). A rubber winding roll 5 and a taft roll 6 are connected to the fixed shafts 5a and 6a through bearings (not shown), respectively.
is rotatably supported. As shown in FIG. 4, when the arm 4 is rotated around the support shaft 4a, a rubber winding roll 5 and a touch roll 6 are moved along the circumferential surface from the upstream side of the winding core 3, and the thin ribbon It is configured to be wound around the F8 winding core 3.

Further, a plate 10 is supported by an arm 9, which will be described later, and a pair of brackets 30 and an inverted-shaped bracket 31 are fixedly installed on the plate 1-10. A push roll 32 (a guide roll of the present invention) is rotatably supported between the tip ends of the pair of brackets 30.

Further, a slide member (not shown) is provided near the tip of the bracket 31 so as to be movable in the vertical direction, and one end of the presser roll 33 is rotatably and tiltably supported on the slide member. ing. When the presser roller 33 is tilted, it is IA in FIG. 3, 1! As shown in the figure, the tip faces upward, allowing it to pass through the sides of the ribbon without touching the ends.

The tip of the presser roller 33 has a tapered shape as shown by the chain line in FIG. In this case, the end of the presser roller 33 holds the thin strip (
I try not to add any damage.

A tension coil spring 34 is stretched between the L-shaped tip of the bracket l-31 and the presser roll 33, and is engaged with the presser roll 33 so as not to inhibit rotation, thereby preventing the ribbon from being cut. At the same time, the presser roller 33 is pulled upward to prevent the presser roller 33 from coming into contact with the thin strip.

On the other hand, an electric motor [6 stones 35] installed below the presser roll 33
When cutting the ribbon, the presser roll 35 is magnetically attracted to bring the presser roll 33 into contact with the ribbon, and tension is applied to the ribbon at the contact portion.

As shown in FIG. 4, when the arm 9 is rotated around the support shaft 9a, the rubber pushing roll 32 lifts the ribbon F from the downstream side of the winding core 3. The winding angle around the winding core 3 is increased so that the ribbon body can be wound around the winding core 3 reliably.

The ribbon cutting device of this embodiment includes a winding core 3 and a push roll 3.
2, and is supported by a pair of L-shaped arms 9 rotatably supported by a support shaft 9a. Support protrusions 10a of plates j to 10 are supported between the tips of both arms 9, and a rectangular plate 10 is supported on the arms 9.

As shown in FIG. 1, an induction motor 11 of a known structure is provided below one end of the plate 10, and a clutch brake 15 of a known structure is provided above the induction motor 11 with the plate 1o in between. It is provided. Note that instead of the induction motor 11, a servo motor may be used as in an embodiment described later. A toothed pulley 12 is attached to the output shaft of the induction motor 11, a toothed pulley 13 is attached to the input shaft of the clutch brake 15, and a toothed belt 14 is stretched between both pulleys 12 and 13. It is suspended. A toothed pulley 16 is attached to the output shaft of the clutch brake 15.

At the other end of the plate 1o, there is a booby support bracket 2.
1 is attached, and a toothed pulley 17 is rotatably supported.

The toothed pulleys 16, 17 are preferably made of aluminum or the like. ! %lJ with lightweight materials such as metal rot or plastic
This enables high-speed rotation. Toothed pulley 16.17
A toothed bell i~18 is stretched between them.

A bracket 22 is provided on the play 1-10, and the bracket 22 is,! As shown in FIG. 5, a rail 20 made of 1-glucan resin and guiding the toothed belt 18 is screwed onto the rail 20 with bolts 23.

The guide rail 20 is connected to the toothed belt 1 as shown in FIG.
8 between the toothed pulleys 16 and 17, and the surface is provided with M for guiding the toothed belt 18 as shown in FIG.
20 a is formed in the direction of movement of the 16 rt belt 18 .

As shown in FIG. 6, one side of the tooth 18a of the toothed belt 18 has been shaved off, and a holder 26 of an L-shaped cutting blade 27 is attached to this part with a stopper 24 and a nut 25. .

The surface of the raised portion 26a of the holder 26 is inclined as shown in FIG. 7, and a cutting blade \i mounting groove 6b is formed on the surface as shown in FIG.

A cutting knife 27 is mounted in the cutting knife mounting groove 26b and fixed by a stopper 28.

The cutting blade 27 travels in the direction of the arrow in FIGS. 6 and 12 to cut the ribbon F.

As shown in FIGS. 6 and 12, the cutting blade 27 has two sides 27a and 27b whose side surfaces on the cutting side of the ribbon intersect in a dogleg shape.
It is formed by two sides 27a of the dogleg-shaped woshita.
, 27b have an expansion angle of about 8° to 100°.

Of the two sides extending from the dogleg-shaped recess 27c, the winding core 3
A cutting blade is formed on one side 27a that applies a cutting force to the ribbon F toward the guide roll 32, and the other side 27b has no cutting blade and is formed as a ribbon guide surface. The dogleg-shaped recess 27c has an arc shape with a radius of about 1 mm,
A cutting blade is formed in the arc portion.

As shown in FIG.
2, the lower angle of the cutting blade 27, that is, the lower side 27a having the cutting blade.
It is preferable that the angle α formed by the ribbon member F and the ribbon member F is 10 to 45°.

Further, the upper angle of the cutting blade 27, that is, the angle β formed by the upper side 27b having the guide surface and the ribbon body F is 15 to 60.
It is preferable to set it as °. The lower angle α is set smaller than the upper angle β so that the ribbon F, which tends to sag due to its own weight during cutting, is held by the cutting blade 27a and cut reliably.

The cutting blade 27a is a double-sided blade as shown in FIG.
The angle θ of the cutting edge is about 30 to 50 degrees, preferably 35 to 4
It is desirable to set the angle to about 5°.

Further, the thickness t of the cutting blade is preferably 0.3 to 0.7 nv, preferably 0.5 to 0.6 mm.

Note that the cutting blade 27a may be a single-edged blade, and in this case, the thickness of the blade is approximately the same as above, and the angle θ of the cutting edge is approximately half of the above value.

It is preferable that the distance T between the recess 27c and the end face of the cutter is approximately 10 mm or less so that the resistance of contact with the ribbon is not too large.

In the above-mentioned FIG. 4, when the thin strip F runs from the winding core 3 to the presser roll (guide roll) 32, the tension of the thin strip E fluctuates in the above area, and the tension between the winding core 3 and the thin strip F Jl between
As the friction coefficient fluctuates, the position where the ribbon body F separates from the winding core 3 changes from the theoretical position 3a to 3b as shown in FIG.
Therefore, during cutting, the traveling position of the thin strip F may slightly vary upward with respect to the blade 27 from the theoretical position shown by the solid line to the position shown by the chain line.

In the present invention, by adjusting the position of the long hole 27d shown in FIG. The concave portion 27c faces the area between the running position of the body and the running position shown by the chain line where the ribbon body is experimentally observed to fluctuate, and the recess 27c is located outside the steady running area of the ribbon body (the first
In Figure 2, it is located at the top).

As described above, since the cutting blade 27 is attached to the toothed belt 18 via the holder 26, when the arm 9 is rotated as shown in FIG. The winding body F is located near the core 3, and the pulley 16.1
The rotating surface of 7 is inclined toward the winding core 3 side so as to intersect with the tangent of the winding core 3, while the toothed bell 1-1
The blade 27 carried by the cutting blade 8 is tilted outward by the cutting blade holder 26 so that its tip is parallel to the tangent to the winding core 3.

Near the clutch brake 15 (as shown in FIG. 8), there is a limit switch 36 for detecting when the cutting blade 27 that has finished cutting the ribbon has reached outside the width of the ribbon F, and a charging switch. A suitable sensor such as a sensor is provided.

Further, on the outside of the cutting start side of the thin strip body, a limit switch 37 is provided for keeping the cutting blade 27 on standby outside the width of the thin strip body F.
, a photoelectric sensor, and other suitable sensors are provided. Sensors such as the limit switches 36 and 37 are connected to the plate 1o or the bracket 2 through the bracket 38 with long holes.
It is attached to 2. Therefore, the sensor can be adjusted to the optimal standby position and cutting completion detection position according to the thickness of the ribbon, the traveling speed, and the blade speed. The distance between the standby position of the cutting blade 27 and the cutting start position is 100 to 200 mm.
Approximately mm is preferable. Note that when a suitable sensor such as the limit switch 36 detects that the cutting blade 27 has reached the outside of the width of the thin strip body F, the rotation of the induction motor 11 is reduced by a method such as an inverter separate method that reduces the motor frequency using an inverter. The cutting blade 27 is moved at an extremely low speed, and when a sensor such as a limit switch 37 detects that the cutting blade 27 has reached a standby position, the induction motor 11 is stopped.

In the present invention having the above configuration, the paper is unwound from an unwinding device (not shown), and subjected to desired processing such as drying, coating, curing, etc. by an appropriate means such as a coater (not shown). A thin strip F of plastic film, paper, etc. is placed on the guide roller 1 as shown in Fig. 2.
is lightly wound onto the winding core 3'.

The outer diameter of the winding core 3' is measured by a sensor (not shown),
The length of the thin strip F to be wound around the winding core 3' is measured using a counter (not shown) or the like, or the winding time of the thin strip F is measured using a timer (not shown). When it is detected that the winding m of the thin strip F on the core 3' has reached a predetermined value, the winding is performed by rotating the roll support arm 2 around the support shaft 2a by the rotation means, as shown in FIG. Then, the winding core 3' is replaced with the winding core 3.

Next, as shown in FIG. 4, the arm 4 is rotated around the support shaft 4a, and a rubber winding roll 5 and a touch roll 6 are moved along the circumferential surface of the winding core 3 from the upstream side, and roll the ribbon material. Wrap F around core 3.

The presser roll 33 is oriented upward as shown at 1111 in FIG. The roll 32 lifts the thin strip F from the downstream side of the winding core 3, and the winding angle of the four strips F around the winding core 3 is increased.
The thin strip is securely wound around the core 3, and the toothed belt 18 is positioned near the core 3 for winding the thin strip F. In this state, the presser roll 33 is brought into a horizontal state, but the tension spring 34 keeps the presser roll 33 out of contact with the ribbon.

The rotary surfaces of the pulleys 16 and 17 are inclined toward the winding core 3 with respect to the tangent to the winding core 3, while the blade 27 carried by the toothed belt 18 is a cutting blade holder. 26, the tip thereof is inclined outward so as to be parallel to the tangent to the winding core 3.

In this state, the cutting blade 27 is located at the samurai 1 position shown in FIG. The motor 11 is driven while the clutch of the clutch brake 13 is disengaged and the brake is applied. Motor 1
When the brake is released and the clutch is connected (to in Fig. 10) when the motor 1 is accelerated to almost the steady cutting speed, the motor 11 passes through the pulley 12, toothed belt 14, pulley 13, clutch brake 15, and the toothed pulley. 16 is rotated,
The cutting blade is moved together with the toothed belt 18.

Therefore, the cutting blade 27 is accelerated from the samurai position to the steady cutting speed, and the limit switch 37 is activated so that the cutting blade 27 starts cutting the ribbon F at point A (time j+) during acceleration. 1 of the cutting blade 27 where the sensor position is located! machine position)
Adjust. After starting cutting, the cutting blade 27 is accelerated to a steady speed, and then cuts the thin strip F at a steady speed, and when detected by a sensor such as the limit switch 36 at point C (time tz>), the speed of the motor 11 is increased. After that, it continues to move around the pulleys 16 and 17 until it is detected by the limit switch 37, etc. When using an induction motor, the steady speed under load is lower than that under no load. is slightly lower.

The cutting locus of the thin strip F is shown in FIG. Cutting starts from one end of the ribbon F at point A, and until point B, where the cutting blade 27 reaches a steady speed, the cutting trajectory becomes a smooth curve because the cutting blade 27 is accelerated. After reaching steady speed, the line becomes a straight line as indicated by BC.

Therefore, when the cutting blade 27 starts cutting, the direction of the cutting line relative to the ribbon F is sufficiently inclined, so that the end face of the ribbon F is not bent, and cutting can be started smoothly.

Moreover, the cutting speed changes clearly from the start of cutting to the steady cutting speed, so the cutting line of the strip does not change suddenly, and even thin strips can be cut smoothly without tearing. The cutting time can be shortened because the thin strip is cut at the tip while the ribbon is accelerated to a high speed, and the cut surfaces do not overlap or have very little overlap. IF is one with no wrinkles and high product value.
4.

A cutting blade is also formed on the upper side 27b of the knife 27,
If the ribbon body F is located on this upper cutting blade, the cutting force of this upper cutting blade acts downward from above, that is, in the opposite direction to the running direction of the ribbon body F. become. For this reason, the cutting force changes significantly, and as a result, the cut surface becomes jagged and cannot be cut well.

On the other hand, in the present invention, since the side 27a on which the cutting blade is formed is set to 1 in the steady running area of the thin strip F, as the blade 27 moves, as shown by the solid line in FIG. , with the cutting blade 27a of the cutter 27 pushing up and locking the ribbon F, the cutting force acting upward from below by the cutting blade 27a is applied in the running direction of the ribbon F running from bottom to top. The cutting effect is doubled.

In addition, in the present invention, the upper side 27 of the cutter 27
Since b is formed with a guide surface that does not have a cutting blade,
Even if the thin strip F were to be located on this upper guide surface 27b, this upper guide surface 27 b 1. is pushed toward the cutting blade 27a without cutting the ribbon F, and the ribbon F is cut by the cutting blade 27a. Therefore, the cutting blade 27a of the cutter 27 applies a cutting force that is consistent with the running direction of the ribbon F to smoothly cut it.

In the present invention, since the cutting state of the cutting blade 27 is naturally controlled by the blade shape and the blade attachment, there is no need for a mechanism to control the biting motion of the blade as in the conventional device described above. It can be made lighter, instead of a heavy chain.
The cutting blade 27 can be attached to a light and rigid flexible belt 18 such as a timing belt, and therefore the speed can be increased to a substantially steady speed in an extremely short time.

1 just before the start of cutting the thin strip F! It is preferable that the magnet 35 is energized and the presser roll 33 is drawn downward and brought into contact with the ribbon F while remaining parallel to the surface of the ribbon F by magnetic force.

As a result, the tension at the cutting start end of the ribbon F increases,
The cut end of the ribbon is cut without being bent.

Increasing the tension when cutting the ribbon F in this manner is particularly effective for cutting thin ribbons having a thickness of 10 μm or less.

It is preferable that the amount of pressing by the presser roll 33 is such that the ribbon moves 2 to 20 mm below or above the running line of the ribbon when it is not pressed by the presser roll 33. By doing this, the running thin ribbon F can be cut at high speed in the width direction within a time period in which the thin ribbon F is transferred by the circumferential length of the winding core 3 or less. .

In the above embodiment, the cutting blade was formed on the lower side of the cutting blade because the ribbon running from the bottom to the top was cut, but when cutting the ribbon running from the top to the bottom, forms a cutting edge on the upper side.

In addition, in the above embodiment, a limit switch 36 etc. was installed to detect the completion of cutting the thin strip, but a timer is started from a clutch input signal or a motor start signal to start cutting, and the thin strip is cut. Predetermined time required to complete cutting the body 9! You can reduce the speed to very low speed after the process has passed.

In the above embodiment, an induction motor is used as the motor 11, but the motor 11 may also be a servo motor. In this case, the clutch brake 13 is omitted, and as shown in FIG. The cutting blade 27 is activated and starts cutting the ribbon at point AT during acceleration and reaches a steady speed at point B during cutting of the ribbon.

As mentioned above, the cutting knife 27 of this repair example has a dogleg-shaped cutting blade 27a, and the ribbon body F is held in the recessed part of the dogleg-shaped cutting blade 27a, and the ribbon body F is held. The cutting blade can reliably cut while suppressing vertical shaking of the cutting start end.

In addition, as in the present example, the flexible toothed belt 18 is located near the core 3 for winding the ribbon, and the toothed pulley 1
The rotating surface of 6.17 is inclined toward the winding core 3 side with respect to the tangent of the winding core 3, and the tip of the cutter 27 carried by the toothed belt 18 is parallel to the tangent of the winding core 3. If the toothed belt 18 is tilted outward, the flexible toothed belt 18 will expand outward due to centrifugal force due to the high speed rotation of the toothed belt 18, and will not cut even if the flexible toothed belt 18 is in the position of the inelastic cutting blade 27. The tip of the blade 27 approaches the winding core 3 in the tangential direction of the winding core 3 and makes light contact with it, thereby making it possible to reliably cut the ribbon.

In the above example, the tension was increased by using an electric stone to attract air to the presser roller and push it into the thin strip, but the tension at the cut end of the thin strip was increased by the weight of the presser roller. Good too. In addition, as a means for increasing the tension near the end of the ribbon, a roller is provided so as to be able to approach and separate from the ribbon, and the roller is mechanically brought into contact with the ribbon to increase the tension. A device that blows compressed air onto the surface of the ribbon or sucks air may be installed near the cutting start end of the ribbon to fluidically apply tension to the ribbon near the cutting start. .

In addition, in the above-described embodiment, the tensioning means for the end of the ribbon was provided downstream of the push roller 32, but depending on the installation space etc., it may be placed near the cutting blade between the push roller 32 and the winding core 3. It may be installed.

[Effects of the Invention] In the method of the present invention, when cutting the thin strip running from the winding core to the guide roll, the cutting force by the cutting blade of the cutter always acts in the running direction of the thin strip during cutting. By moving the blade relative to the ribbon, the influence of tension fluctuations during cutting can be reduced and the cut end surface can be prevented from becoming jagged.

Moreover, the present invention includes a cutting blade that is inclined with respect to the ribbon body, and a guide surface that is connected to the cutting blade and applies a force in the direction of the cutting blade when the ribbon body is positioned away from the cutting blade. In other words, the side surface on the cutting side of the ribbon is formed by two sides that intersect in a dogleg shape, and of the two sides extending from the dogleg-shaped recess, the ribbon from the winding core to the guide roll is A cutting blade is formed on one side that applies cutting force to the body, and the other side has no cutting blade and is formed as a guide surface for the ribbon. The concave portion faces the running range and is located outside the steady running range of the thin strip.

With this configuration, the running of the ribbon during cutting is prevented due to fluctuations in the tension of the ribbon between the winding core and the guide roll, fluctuations in the FJ friction coefficient between the winding core and the ribbon, etc. Even if the position of the ribbon moves up and down with respect to the blade and the ribbon comes to face the guide surface of the blade, the ribbon will be pushed toward the cutting blade by the guide surface of the blade and Cut the thin strip with.

For this reason, - the cutting force of the knife does not act in the opposite direction to the running direction of the ribbon, the cutting force of the cutting blade of the knife always acts in the running direction of the ribbon during cutting, and the ribbon Can cut the body well.

In addition, in the present invention, the cutting blade can be attached to a lightweight flexible belt such as a timing belt instead of a heavy chain like the conventional device described above. There is no need for the two blades of the cutter to engage in a biting motion, and the weight can be reduced, and the steady cutting speed can be significantly increased compared to the above-mentioned 81 using a chain. The speed-up time can also be shortened, making it applicable to high-speed processing devices for strip-shaped materials.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts of a ribbon cutting device for carrying out the method of the present invention, and FIGS. 2 to 4 are a core for winding a ribbon of the ribbon cutting device shown in FIG. 1. 5 is a cross-sectional view of the guide section of the flexible belt, FIG. 6 is a front view showing how the flexible belt seat is attached to the cutting blade, and FIG. 8 is a schematic front view showing how the sensor is installed, and FIG. 9 is a plan view showing how the ribbon is cut.
Figures 10 and 11 are time-velocity diagrams showing the cutting situation, Figure 12 is a partially enlarged view of Figure 6, and Figure 13 is the 12th
The xnr-xrfi sectional view in the figure, Figure 14 is the X in Figure 12.
15 is a partially enlarged view of FIG. 4, and FIG. 16 is a partially enlarged view of FIG. 15. 3.3'... Winding core, 27... Cutting knife, 27
a... Cutting blade, 27b... Guide surface, 27C.
... recess, 32... presser roll.

Claims (1)

[Claims] 1. A method for cutting a thin strip traveling from a winding core to a guide roll, which includes a cutting blade that is inclined with respect to the thin strip, and a cutting blade that is connected to the cutting blade and that the thin strip is connected to the cutting blade. Using a blade equipped with a guide surface that applies a force in the direction of the cutting blade when the blade is positioned away from the blade, the blade is cut so that the cutting force by the cutting blade of the blade always acts in the running direction of the ribbon during cutting. A method for cutting a thin ribbon body, characterized by moving a blade against the object. 2. In a device that cuts the ribbon by moving a cutting blade from one end face to the other end face of the ribbon between a winding core and a guide roll, the cutting blade cuts the ribbon from the cutting side of the ribbon. It is formed by two sides that intersect in a dogleg shape, and of the two sides extending from the dogleg-shaped recess, one side that applies cutting force to the thin strip from the winding core to the guide roll is cut. A blade is formed on the other side, and the other side has no cutting blade and is formed as a thin strip guide surface. A thin strip cutting device characterized in that it is located outside a steady running area.