JPH0317640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for cutting a ribbon and an apparatus for carrying out the same. More specifically, the present invention relates to drying, coating, and curing thin strips such as plastic films and paper, such as audio cassettes, professional videos, home videos, digital computer tapes, photographic films, photosensitive films, and typewriter ribbons. When performing such processing and winding up on a winding device, wind the thin ribbon material being wound around one winding core onto an empty winding core without stopping its running, and continue winding. The present invention relates to a method for cutting a thin strip and an apparatus for carrying out the method, and particularly to a method for cutting an extremely thin thin strip having a thickness of about 3 to 20 microns, and an apparatus for carrying out the method.

[Conventional technology]

As a cutting device for resin sheets, it was developed in 1982.
Publication No. 1597 discloses that a pair of chain rings are rotatably supported on the outside in the width direction of resin sheets to be transferred in the longitudinal direction, and an endless chain carrying a cutting blade is stretched between the chain rings. A sheet presser is installed parallel to the running direction of the endless chain, sandwiching the travel path of the resin sheets, and a telescopic cylinder rod is connected to the sheet presser to cut the resin sheets that were traveling in the longitudinal direction. When cutting the resin sheet in the horizontal direction with a knife, first stop the resin sheet from moving, press down the sheet presser with the cylinder rod and bring it into contact with one side of the stopped resin sheet, and during this contact, cut the cutting knife from one side of the sheet. A cutting device for resin sheets is disclosed which cuts the resin sheets laterally by moving the resin sheets to the other side.

In this conventional apparatus, since the sheet is held down by the sheet presser and cut by the cutting blade, it is necessary to stop the conveyance of the sheet at the time of cutting.
Therefore, during cutting, the resin sheet near the cutting part is transported at a speed significantly different from that during steady processing, and this speed difference changes the quality of the sheet near the cutting blade. Particularly when the sheet is a thin resin film, it is necessary to discard the resin film before and after the cut portion as a defective product. Furthermore, since the conveyance of the sheet is stopped every time the sheet is cut, the productivity of sheet processing cannot be improved. In particular, if the film processing speed is increased to increase productivity, and at the same time the film winding core is replaced to continuously wind the film, the above-mentioned problems will become more pronounced.

In order to solve the above-mentioned problems, the inventor of the present invention omitted the sheet presser and the cylinder rod connected thereto in the above-mentioned apparatus, and made the sheet run in the longitudinal direction without stopping the conveyance of the sheet during cutting. An attempt was made to cut the sheet by moving the cutting blade in a direction perpendicular to the running direction. However, with this method,
Since the cutting blade is moved by an endless chain attached to a chain ring, the cutting speed cannot be sufficiently increased, and the cut surface of the sheet is largely inclined in the longitudinal direction of the sheet. When the cut surfaces of the sheets cut at an angle in this manner are wound around the core, the cut surfaces of the sheets overlap in the longitudinal direction of the core. For this reason, it has been found that when the sheet is a thin film, the film wound on the core becomes wrinkled, resulting in a problem that the commercial value is significantly reduced.

Furthermore, as a result of intensive research by the present inventors, it has been found that the cut surfaces of the film do not overlap in the longitudinal direction of the winding core, that is, the film is transported by the circumference of the winding core or within a shorter period of time. It has been found that the above-mentioned wrinkles do not form if the material can be cut at high speed in the width direction.

In order to solve the above problem, the present applicant previously proposed in Japanese Patent Application Laid-Open No. 120996/1987 a method for cutting a longitudinally running thin strip in the lateral direction using a cutting blade, in which the run-up area , the cutting blade is increased to a substantially steady cutting speed, and the cutting blade is run in a direction intersecting the ribbon running in the longitudinal direction to cut the ribbon, thereby cutting the ribbon. Later, he proposed a method for cutting a thin ribbon body in which the cutting blade is stopped at a standby position for starting the run-up, and an apparatus for carrying out the method.

[Problem that the invention seeks to solve]

It has been confirmed that the above method can cut ordinary ribbons very well. However, when the thickness of magnetic film is as thin as 3 to 20μ, the tension when winding the ribbon is low (for example,
For 7μ magnetic film, the weight is 2 to 6 kg), and the edges of the ribbon are wobbly and easily bent, and even when cut using the above proposed method, there is a problem that the cutting start end is bent. Ta.

In order to solve these problems, a method of uniformly increasing the winding tension of the ribbon may be considered. However, according to experiments conducted by the inventor of the present invention, as the ribbon is cut, the remaining width of the ribbon decreases, so when the winding tension of the entire thin ribbon is uniformly increased as described above, There was a problem in that the tension acting on the remaining portion of the ribbon increases as it is cut, and the excess tension causes the ribbon near the end of the cut to be torn into pieces. For this reason, the above-mentioned method of uniformly increasing the winding tension of the ribbon could not be adopted.

Furthermore, in Japanese Patent Application Laid-open No. 59-169795, a frame body is provided so that the long thin strip can be moved in the conveying direction at the same speed as the thin strip, and the thin strip is pressed by a cutter knife and both sides of the cutter knife. It is disclosed that a clamping tool is provided on the frame. In this device, the frame body is moved at the same speed as the ribbon body, and the holding tool presses and holds both sides of the cutter knife so that no tension is applied to the ribbon body, and the frame body moves together with the ribbon body. Cut the ribbon using a cutter knife.

Furthermore, Japanese Patent Publication No. 58-37119 discloses that a cart that moves in the direction of movement of the sheet in synchronization with the speed of the sheet that moves at a constant speed has two parallel lifting bars that lift the sheet from the sheet movement surface. A cutting blade guide is provided opposite to the parallel lifting bar, and two nip rolls and a cutting blade are provided before and after the cutting blade guide. In this device, the sheet is gripped by the nip rolls before and after the cutter, and the sheet is lifted from the sheet movement surface by a parallel lifting bar that moves with the sheet, and the sheet is moved in the direction of sheet movement while applying uniform tension to the sheet between the nip rolls. Cut the sheet with a cutter.

The above-mentioned Japanese Patent Application Laid-open No. 169795 and Japanese Patent Publication No. 58-
The device disclosed in Publication No. 37119 is provided with a frame body or a truck that moves in the direction of transport of the object to be cut, and a blade for cutting the object to be cut is mounted on the frame or the truck, and a blade for cutting the object to be cut is mounted on both sides of the blade. The cutting tool is provided with gripping rollers that nip the object, and the object to be cut is gripped on both sides of the blade by the gripping rollers, and the object is cut by the blade that moves together with the object. The cart or frame must move in the moving direction of the object at the same speed as the object while supporting the blade and the gripping roller. The trolley and frame are heavy and there is an upper limit to their moving speed, and in the device described in the above publication, the moving speed of the object to be cut is limited by the upper limit of the moving speed of the trolley and frame. It is not used for high-speed cutting of thin strips running at high speed, such as the purpose of

In view of the above-mentioned problems, an object of the present invention is to provide a method and apparatus that can reliably cut a thin ribbon traveling at high speed.

[Means for solving problems]

In the present invention, when cutting the ribbon, a cutting blade is run along a support member that is stopped near the ribbon, and the ribbon running in the longitudinal direction is laterally cut by the cutting blade. In the method of The above-mentioned problems are solved by a method for cutting a thin strip, which is characterized in that the thin strip is cut by running the thin strip in a direction intersecting the strip.

Further, as an apparatus for carrying out the above method, a support member is provided which can be stopped near the ribbon when cutting the ribbon, and the support member is configured to sandwich the ribbon running in the longitudinal direction so as to cut the width of the ribbon. A pair of pulleys are rotatably supported by the supporting member at positions outside the direction, and a flexible belt intersects with the running direction of the thin strip body and extends near the running area of the thin strip body. The flexible belt is stretched around the pulleys, and the flexible belt carries a cutting blade for the thin strip body, and at least one of the pulleys is connected to a drive motor, and the flexible belt carries a cutting blade for the thin strip body, and at least one of the pulleys is connected to a drive motor. A thin strip body characterized in that means for locally increasing the tension near the cutting side end of the thin ribbon body when the cutting knife cuts in the transverse direction is installed near the cutting start side end of the thin strip body. A cutting device is provided.

[Effect]

In the method of the present invention, the tension at the end of the ribbon on the cutting start side is locally increased, so that the end of the ribbon does not bend due to the cut of the cutting blade when cutting the end of the ribbon. The thin ribbon can be cut reliably. Moreover, in the method of the present invention,
Since the tension is increased only in a limited place, the end of the cutting initiator of the ribbon, after the area where this tension is increased (the end of the ribbon on the cutting start side) is cut, the ribbon The rest of the body has little effect on increasing tension. Therefore, the ribbon is not adversely affected by locally increased end tension, and the cut ends of the ribbon are not torn due to excessive tension.

In addition, in the method of the present invention, the cutting blade is accelerated to a substantially steady cutting speed in the run-up area, and the cutting blade is made to run in a direction intersecting the thin ribbon body running in the longitudinal direction, thereby cutting the thin ribbon body. disconnect. Therefore, it is possible to cut the running ribbon at high speed in the width direction while the ribbon is being transported by the circumference of the core or in a shorter period of time, and to cut the ribbon in the longitudinal direction of the core. The cut surfaces of the ribbon do not overlap, and wrinkles as described above do not occur.

In addition, in the device of the present invention, the cutting blade is attached to a lightweight flexible belt such as a timing belt, rather than a heavy chain as in the conventional device described above, and the cutting blade is attached to a lightweight flexible belt such as a timing belt. When the rotation of the pulley is controlled by a control device and the ribbon running in the longitudinal direction is laterally cut by the cutting blade, the edge of the ribbon is placed near the end of the cutting initiator by the cutting blade. Install means to increase tension in the vicinity;
The cutting blade is accelerated to a substantially steady cutting speed to cut the ribbon, and after cutting the ribbon, the cutting blade is stopped at a standby position for starting the run-up. Therefore, the cutting blade, which is accelerated to a substantially steady speed, can cut a thin ribbon whose end tension is increased to prevent bending. Moreover, since the cutting blade is attached to a lightweight flexible belt, the steady cutting speed of the cutting blade can be significantly increased compared to the above-described chain-based apparatus.

As a means to increase the tension near the end of the ribbon,
A roller may be provided so as to be able to come into contact with and separate from the thin strip, and the roller may be brought into mechanical contact with the thin strip to increase the tension.
A device for blowing compressed air or sucking air may be installed near the cutting start end of the ribbon to fluidically apply tension to the vicinity of the cutting start end of the ribbon.

〔Example〕

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

In FIG. 2, for example, a plastic film, paper, etc. 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). The thin strip F passes through a guide roller 1 rotatably supported on a machine frame (not shown) and is wound onto a winding core 3' rotatably supported on a winding roll support arm 2 (see arrow). ). Note that the guide roller 1 may be a tension roller for detecting the tension of the ribbon and adjusting the winding speed.

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

At both ends of the winding roll support arm 2, winding cores 3, 3' are rotatably supported. Winding core 3,
3' may be a method that drives the center part,
Alternatively, a method may be adopted in which the surf ace portion is driven.

The outer diameter of the winding core 3' is measured with a sensor (not shown), or the length of the thin strip F wound around the winding core 3' is measured with a counter (not shown) or the like. When the winding time of the strip F is measured by a timer (not shown) and it is detected that the amount of winding of the thin strip F on the winding core 3' has reached a predetermined amount, as shown in FIG. , the winding roll support arm 2 is rotated around the support shaft 2a by the rotation means to replace the winding core 3' with the winding core 3. Next, as shown in FIG. 4, the ribbon F is wound around a new winding core 3.

In other words, the pair of arms 4 having an inverted L shape are
Its lower end is rotatably supported by a support shaft 4a, and its upper end is supported by two parallel fixed shafts 5a, 6a.
(Fig. 1). fixed shaft 5a,
Rubber winding rolls 5 and touch rolls 6 are rotatably supported on 6a via bearings (not shown), respectively. 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 of the winding core 3 from the upstream side. is configured to be wound around the winding core 3.

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

Further, a slide member (not shown) is provided near the tip of the bracket 31 so as to be movable in the vertical direction. One end of a presser roll 33, which is an embodiment of a means for locally increasing the tension near the cut end of the ribbon of the present invention, is rotatably and tiltably supported on the slide member. When the presser roll 33 is tilted, the tip thereof is directed upward as shown by the chain line in FIG. 3, and the presser roll 33 can pass over the side of the end of the ribbon without contacting it.

The tip of the presser roller 33 has a tapered shape as shown by the chain line in FIG. In this case, the edge of the presser roller 33 is designed to prevent the ribbon from being damaged.

The tension coil spring 34 is attached to the L of the bracket 31.
It is stretched between the tip of the letter and the presser roll 33, and the presser roll 3 is stretched so as not to impede rotation.
3, and when the ribbon is not cut, the presser roller 33 is pulled upward and the presser roller 3 is engaged with the presser roller 3.
3 so as not to come into contact with the thin ribbon body.

On the other hand, an electromagnet 35 installed below the presser roll 33 magnetically attracts the presser roll 35 when cutting the ribbon, and brings the presser roll 33 into contact with the ribbon.
Tension is applied to the thin strip at the contact portion.

As shown in FIG. 4, when the arm 9 is rotated around the support shaft 9a, the rubber push roll 32
is configured to lift the thin strip F from the downstream side of the winding core 3, increase the winding angle of the thin strip F around the winding core 3, and ensure that the thin strip F is wound around the winding core 3. There is.

The ribbon cutting device of the present invention cuts a ribbon in the lateral direction at high speed between a winding core 3 and a push roll 32. It is supported by a letter-shaped arm 9. A rectangular plate 1 supports the support protrusion 10a of the plate 10 between the ends of both arms 9.
0 is supported on arm 9.

As shown in FIG. 1, a servo motor 11 with a brake of a known structure is provided below one end of the plate 10, and a clutch brake of a known structure is provided above the servo motor 11 with the plate 10 in between. 15 are provided. A toothed pulley 12 is attached to the output shaft of the servo motor 11, and a toothed pulley 13 is attached to the input shaft of the clutch brake 15.
is attached, and a toothed belt 14 is stretched between both pulleys 12 and 13. clutch brake 15
A toothed pulley 16 is attached to the output shaft of.

A pulley support bracket is attached to the other end of the plate 10, and a toothed pulley 17 is rotatably supported.

The toothed pulleys 16, 17 are preferably made of a lightweight metal such as aluminum or a lightweight member such as plastic to enable high speed rotation. Toothed pulley 1
A toothed belt 18 is stretched between 6 and 17.

A bracket 22 is provided on the plate 10, and a toothed belt 18 made of resin is attached to the bracket 22.
As shown in FIG. 5, the rail 20 guiding the
It is screwed in with a bolt 23.

As shown in FIG. 1, the guide rail 20 extends between the toothed pulleys 16 and 17 along the toothed belt 18, and has a guide rail 20 on its surface for guiding the toothed belt 18 as shown in FIG. A groove 20a is formed in the direction of movement of the toothed belt 18.

As shown in FIGS. 6 and 7, at the location where one tooth 18a of the toothed belt 18 has been removed (see FIG. 6), an L-shaped cutting blade 2 (see FIG. 7) is attached.
The retainer 26 of No. 7 is attached to the set screw 24 and the nut 25.
It is attached by.

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

A cutting blade 27 is installed in the cutting blade mounting groove 26b and fixed with a set screw 28. The cutting blade 27 has a dogleg-shaped cutting surface 27a (its expansion angle is
80 to 100°), and runs in the direction of the arrow in FIG.
cut. As shown in FIG. 4, when the ribbon runs diagonally upward from the winding core 3 toward the presser roll 32, the lower angle of the cut surface, that is,
The angle α between the lower side of the cut surface and the ribbon F is 10~
The angle is preferably 35°. Further, the upper angle of the cut surface, that is, the angle β between the upper side of the cut surface and the thin ribbon body F is the value obtained by subtracting the lower angle α from the expansion angle. Therefore, the lower angle α is equal to the upper angle β
It is possible to reliably cut a thin ribbon body, which is set smaller and tends to sag due to its own weight during cutting, while being held by the lower cutting surface. Note that it is preferable that the doglegged cutting surface 27a be a double-sided blade.

As described above, the cutting blade 27 is inserted through the holder 26.
is attached to the toothed belt 18, so the arm 9
When rotated as shown in FIG. 4, the toothed belt 18 is located near the core 3 for winding the ribbon F, and the rotating surfaces of the pulleys 16 and 17 are close to the core 3. The cutter 27 carried by the toothed belt 18 is positioned so as to be inclined toward the winding core 3 so as to intersect with the tangent line of the winding core 3 . Slanted outward parallel to the tangent.

A suitable sensor (not shown) such as a photoelectric sensor is provided near the clutch brake 15 to detect when the cutting blade 27 that has finished cutting the ribbon has reached outside the width of the ribbon. When the sensor detects the passage of the cutting blade 27, a control device (not shown) applies the clutch brake 15 to disengage the clutch so that the power of the motor 11 is not transmitted to the toothed belt 18. The motor 11 may be braked at the same time. Thereby, the cutting blade 27 is adjusted to stop at the position of the pulley support bracket 21 or in front of it.

If the stopping position of the cutting blade 27 exceeds the start position of the next run-up, after the cutting blade 27 has stopped, the control device reverses the motor 11, connects the clutch of the clutch brake 15, and rotates the toothed belt. 18 and the cutting blade 27 is returned to the standby position.
In this embodiment, the mounting position of the sensor also corresponds to the standby position of the cutting blade 27,
The cutting blade 27 is activated at this sensor position by the control device.
stop and wait.

In the present invention having the above configuration, for example, a plastic film is unwound from an unwinding device (not shown) and subjected to desired treatments such as drying, coating, curing, etc. by an appropriate means such as a coater (not shown). , the thin strip F of paper etc.
As shown in the figure, it is wound onto a core 3' via a guide roller 1.

The outer diameter of the winding core 3' is measured by a sensor (not shown), or the thin strip F is wound around the winding core 3'.
The amount of winding of the thin strip F on the winding core 3' is determined by measuring the length of the thin strip F with a counter (not shown) or the like, or by measuring the winding time of the thin strip F with a timer (not shown). When it is detected that the winding roll has reached a predetermined amount, as shown in FIG. Replace.

Next, as shown in FIG. 4, the arm 4 is rotated around the support shaft 4a, and the rubber winding roll 5 and tatsuchi roll 6 are rolled along the circumferential surface of the winding core 3 from the upstream side, and the thin strip F Wind around core 3.

On the other hand, the presser roll 33 is oriented upward as shown by the chain line in the state shown in FIG. 3, and the arm 9 is rotated around the support shaft 9a in this state. The arm 9 is held in the state shown in FIG. 4 at least until the cutting of the ribbon F is completed. Presser roll 33
reaches the upper part of the ribbon, and as shown in FIG. The attachment angle is increased to securely wind the ribbon around the core 3, and the toothed belt 18 is positioned near the core 3 for winding the ribbon F. In this state, the presser roll 33 is kept in a horizontal state, but lifted by the tension spring 34 so that the presser roll 33 does not come into contact with the ribbon body.

The rotating surfaces of the pulleys 16 and 17 are inclined toward the core 3 with respect to the tangent to the core 3, while the blade 27 carried by the toothed belt 18 is attached to the 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 clutch brake 1 is controlled by the control device.
3 is connected, and the motor 11 is driven in the forward direction (in the direction of the arrow in FIG. 1) by the control device. As a result, from the motor 11 to the pulley 12, the toothed belt 1
4. The toothed pulley 16 is rotated via the pulley 13 and the clutch brake 15, and the toothed belt 18 is moved in the forward direction. Therefore, the cutting blade 27 is run-up from the standby position near the clutch brake 15 via the toothed pulley 16 to the vicinity of the pulley support bracket 21, and in this run-up area, the cutting blade 2
7 is increased to a substantially steady cutting speed.

In the device of the present invention, the cutting blade 27 is attached to a lightweight flexible belt 18 such as a timing belt, rather than a heavy chain as in the conventional device described above. It can be increased to speed.

The cutting blade 27, which has been accelerated to an almost steady speed in this way, is rotated around the toothed pulley 17, and is cut from the end (the side opposite to the above-mentioned standby position) of the thin strip F (thickness: 4μ to 20μ). The thin ribbon F is then cut in a direction intersecting the thin ribbon F (travel speed is 600 m/min or more) which is running in the longitudinal direction (the cutting speed is 1200 m/min).

The electromagnet 35 is energized by the cutting blade 27 just before the start of cutting the ribbon F, and the magnetic force attracts the presser roll 33 downward while remaining parallel to the surface of the ribbon F so as to bring it into contact with the ribbon F. As a result, the tension at the cutting start end of the ribbon F increases, and the cutting blade 27
When cutting into the ribbon F, the cut end of the ribbon is cut without being bent. Increasing the tension when cutting the ribbon F in this way is especially important when the thickness is
Effective for cutting thin ribbons of 10μ or less. The pressing amount of the presser roll 33 is 2 to 20 mm from the running line of the thin strip when it cannot be pressed by the presser roll 33.
It is preferable to set it to such an extent that the ribbon body moves downward or upward by mm.

Although the tension is locally increased by the presser roll 33 only in the vicinity of the cutting start side end of the ribbon F, the tension at a portion away from this end remains substantially unchanged.

Therefore, the running thin ribbon F can be cut at high speed in the width direction while the thin ribbon F is being transported by the circumferential length of the winding core 3 or within a time shorter than that.
As a result, the cut surfaces of the ribbon F do not overlap in the longitudinal direction of the winding core 3, and wrinkles do not occur. Furthermore, since the cutting blade 27 is attached to a lightweight flexible belt, the steady cutting speed of the cutting blade can be significantly increased compared to the above-mentioned apparatus using a chain.

When the cutting blade 27 that has finished cutting the ribbon reaches a position near the clutch brake 15, the passage of the cutting blade 27 is detected by an appropriate sensor (not shown) such as a photoelectric sensor, and this signal causes the control device to The clutch brake 15 is applied to disengage the clutch, and the power from the motor 11 is transferred to the toothed belt 18.
prevent it from being transmitted to At the same time, the control device may apply a brake to the motor 11. In this way, the cutting blade 27 is stopped at or in front of the pulley support bracket 21.

When the stop position of the cutting blade 27 exceeds the start position of the next run-up, after the cutting blade 27 has stopped, the control device reverses the motor 11, connects the clutch, and moves the cutting blade 27 together with the toothed belt 18. Return to standby position. In this example,
The mounting position of the above sensor also corresponds to the standby position of the cutting blade, and the cutting blade 2 is placed at this sensor position.
7, the control device disengages the clutch brake 15 and at the same time stops the motor 11 to stop the cutting blade 27 at the standby position and wait for the next cutting. Note that another sensor may be provided for setting the standby position. Further, the step of returning the cutting blade 27 to the standby position may be performed immediately before the next cutting operation.

As mentioned above, the cutting blade 27 of this embodiment has a dogleg-shaped cutting surface 27a, and the ribbon body F is held in the recessed part of the dogleg-shaped cutting face 27a, and the ribbon body F is cut. The cutting recess allows reliable cutting while suppressing the vertical swing of the end.

In addition, as in this embodiment, the flexible toothed belt 18 is located near the core 3 for winding the ribbon, and the rotating surfaces of the toothed pulleys 16 and 17 are aligned with the tangent to the core 3. When the tip of the cutter 27 carried by the toothed belt 18 is tilted outward so as to be parallel to the tangent to the winding core 3, the toothed belt 18 rotates at high speed, the flexible toothed belt 18 expands outward due to centrifugal force, and even when the cutting blade 27 has no elasticity,
The tip of the cutting blade 27 is connected to the winding core 3 in the tangential direction of the winding core 3.
The thin strip can be reliably cut by approaching it and touching it lightly.

In the above embodiment, the tension is increased by magnetically attracting the presser roller using an electromagnet and forcing it into the ribbon, but the tension at the cut end of the ribbon may be increased by the weight of the presser roller. 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 end. .

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

〔Effect of the invention〕

In the present invention, the supporting member is stopped, and the above-mentioned Japanese Patent Publication No. 58-37119,
It is not necessary to run the frame body at the same speed as the thin strip body as in the device described in Publication No. 169795, and the moving speed of the thin strip body is not limited by the movement of the heavy frame body. The speed can be increased, and by applying tension to the ribbon at the end on the cutting start side, a ribbon traveling at high speed can be reliably cut.

Further, in the present invention, the tension at the end of the ribbon on the cutting start side is locally increased. Therefore, when cutting the end of the ribbon, the end of the ribbon does not bend due to the cut made by the cutting blade. Thereby, the thin ribbon body can be cut reliably.

If the tension is increased across the entire ribbon, the remaining width of the ribbon will decrease as it is cut, and as a result, the tension acting on the remaining ribbon will increase rapidly, and due to the synergistic effect with the depth of cut made by the cutting blade. The thin strip is torn into pieces. In contrast, in the present invention, the tension is increased only at a limited location, that is, the end of the ribbon on the cutting start side. Therefore, after the part of the ribbon where the tension is increased (the end of the ribbon on the cutting start side) is cut, the effect of increasing the tension will hardly affect the rest of the ribbon. Therefore, the ribbon is not adversely affected by locally increased edge tension;
The cut end portion of the ribbon will not be torn or torn due to excessive tension.

Further, in the present invention, the cutting blade is accelerated to a substantially steady cutting speed in the run-up area, and the cutting blade is moved in a direction intersecting the thin ribbon body running in the longitudinal direction to cut the thin ribbon body. do. Therefore,
It is possible to cut the running ribbon at high speed in the width direction while the ribbon is being transferred by the circumference of the winding core or in a shorter period of time, and the thin ribbon can be cut in the longitudinal direction of the winding core at high speed. The cut surfaces do not overlap and there are no wrinkles.

In addition, in the device of the present invention, a specially shaped cutting blade is attached to a lightweight flexible belt such as a timing belt, instead of a heavy chain as in the conventional device described above. When the rotation of the wrapped pulley is controlled by a control device and the thin strip running in the longitudinal direction is laterally cut by the cutting blade, the thin ribbon is placed near the end on the cutting start side by the cutting blade. A means for increasing the tension near the body end is installed, and the cutting blade is accelerated to a substantially steady cutting speed to cut the ribbon, and after cutting the ribbon,
The cutting blade is stopped at a standby position for starting the run-up. Therefore, the cutting blade, which is accelerated to a substantially steady speed, can cut a thin ribbon whose end tension is increased to prevent bending.

Moreover, since the cutting blade is attached to a lightweight flexible belt, the steady cutting speed of the cutting blade can be significantly increased compared to the above-described chain-based apparatus. Therefore, it is possible to cut the running ribbon at high speed in the width direction while the ribbon is being transported by the circumference of the core or in a shorter period of time, and to cut the ribbon in the longitudinal direction of the core. The cut surfaces of the thin strip do not overlap and wrinkles do not form.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of a ribbon cutting device according to the present invention, and FIGS. 2 to 4 show switching of a core for winding a ribbon using the ribbon cutting device of the present invention. FIG. 5 is a side view showing the operation, FIG. 5 is a sectional view of the guide section of the flexible belt, FIG. 6 is a front view showing the state in which the cutting blade is attached to the flexible belt, and FIG. 7 is a cross-sectional view of FIG. 6. It is. 3, 3'... core, 4, 9... arm, 11...
... Servo motor with brake, 12, 13 ... Toothed pulley, 14 ... Toothed belt, 15 ... Clutch brake, 16, 17 ... Toothed pulley, 18 ...
...Toothed belt.

Claims (1)

[Scope of Claims] 1. When cutting a ribbon, a cutting blade is run along a support member that is stopped near the ribbon, and the ribbon running in the longitudinal direction is laterally cut by the cutting blade. In this method, the speed of the cutting blade is increased to a substantially steady cutting speed, and the tension near the cutting start side of the ribbon is locally increased, and the cutting blade is run in the longitudinal direction. A method for cutting a thin ribbon, the method comprising cutting the thin ribbon by running the ribbon in a direction intersecting the ribbon. 2. A support member is provided that can be stopped near the ribbon body when cutting the ribbon body, and a pair of pulleys are provided at positions outside the ribbon body in the width direction, sandwiching the ribbon body running in the longitudinal direction. A flexible belt rotatably supported by the support member and extending in the vicinity of the running area of the thin strip body intersecting the running direction of the thin strip body is stretched around the pulley, The flexible belt carries a cutting blade for the ribbon body, and at least one of the pulleys is connected to a drive motor, and the flexible belt carries a cutting blade for the ribbon body, and at least one of the pulleys is connected to a drive motor, so that when the longitudinally running ribbon body is cut in the transverse direction by the cutting blade, the flexible belt A device for cutting a thin ribbon body, characterized in that means for locally increasing the tension near the cutting side end of the thin ribbon body is installed near the end on the side where cutting is started by the cutting blade. 3. The thin ribbon cutting device according to claim 2, wherein the means for increasing the tension near the end of the ribbon is a roller that is movable toward and away from the ribbon. 4. The thin ribbon cutting device according to claim 2, wherein the means for increasing the tension near the end of the ribbon is a device that blows compressed air toward the end of the ribbon. 5. The thin ribbon cutting device according to claim 2, wherein the means for increasing the tension near the end of the ribbon is a device that sucks the end of the ribbon. 6. The cutting blade has a dogleg-shaped cutting surface, and cuts the ribbon body with a concave portion of the dogleg-shaped cutting surface;
Any one of claims 2 to 5, wherein the angle α formed between the lower side of the cut surface and the ribbon body is set smaller than the angle β formed between the upper side of the cut surface and the ribbon body. The thin ribbon cutting device according to item 1.