JP4878885B2 - Web material end detection device - Google Patents

Description

  The present invention relates to a web material end detection device that detects the end of a web material when a web material such as a packaging material wound around a paper tube is rewound.

  Conventionally, a web material such as a packaging material is wound around a paper tube to form a roll body, and the roll body is rotatably mounted on a roll holder attached to the packaging machine. By rotating the roll body in the rewinding direction according to the packaging operation by the packaging machine, the web material is supplied to the required machine / device. The web-shaped packaging material supplied to the packaging machine is formed into a cylindrical shape, surrounds the periphery of the product, is subjected to heat sealing, and is gradually consumed by being formed into a bag for packaging the product. The end of the web material may be attached to the paper tube with an adhesive or adhesive tape, or it may be simply wrapped free.

  When the web material is used up to the end, the rotation of the guide roller on which the web material fed from the paper tube or roll body is hung is stopped. However, when the web material is attached to the paper tube, a strong tension is generated in the web material when the feeding from the paper tube is completed. Conventionally, as a method for detecting the end of the web material, this strong tension generated in the web material is used in the case where the web material is attached to the paper tube. That is, as shown in FIG. 4A, the web material Fw fed out from the roll body R is guided by being hung on some guide rollers 23, and supplied to a predetermined machine or device at the consumption position. Is done. When the web material Fw is used up to the end when it is wound around the weight roller 20 in the middle of the supply, as shown by the imaginary line, it is increased by stretching with the paper tube T to which the end is stuck. The weight roller 20 is raised by the tension applied. When the weight roll 20 rises to the top dead center, the sensor 21 provided corresponding to the top dead center detects that the web material Fw has been fed to the end.

  Further, in the case of a simple wrapping web material in which the end of the web material is not attached to the paper tube, as a method for detecting the end of the web material, it is utilized that tension does not act on the web material. That is, as shown in FIG. 4B, when the web material Fw is drawn out to the end, the web material Fw is peeled off from the paper tube T and hangs down as shown by an imaginary line, and as a result, the tension of the web material Fw sharply decreases. . In the vicinity of the guide roll 23, the end of the web material can be detected by the main body ground by pressing the micro switch 24 in the center in the width direction of the web material Fw.

As a film sheet detection device, a large number of film storage units for storing films are arranged side by side, and a film sheet formed in a strip shape is wound around a core in a roll shape, and the film sheet is further downstream from the core through a detour. The presence or absence of a film sheet provided opposite to at least one film sheet on the way to or returning from the detour, and a biasing means for forming the detour One having a film sheet detecting means for detecting the above has been proposed (Patent Document 1). According to this configuration, the film sheet wound in a roll shape around the core is conveyed further downstream through the detour on the downstream side of the core. The detour is formed by the urging force of the urging means, and sagging of the film sheet is prevented. When the film sheet is consumed and becomes the rear end, whether the rear end of the film sheet is not provided with a detected part such as a mark, or is the rear end of the film sheet attached to the core? Regardless of whether or not, even for a wide variety of film sheets, the detour changes from the initial state, this change is detected by the film sheet detection means, and the trailing edge of the film sheet is accurately detected I am trying.
JP 2001-2277763 (paragraphs [0012] and [0051], FIG. 2)

Also, a large tension generated at the end of the feeding is detected from the movement of the dancer roller, and the film feeding motor is stopped by the detected force, and the film roll is released by releasing the detention of the paper tube. There has been proposed a film terminating device that suppresses the damage to the film that occurs and allows the film to be unwound and used (Patent Document 2). Specifically, when all the film wound around the paper tube is exhausted, a sudden tension fluctuation of the pull-down belt acting on the film whose end is fixed to the paper tube via the dancer roller appears as a sudden rise of the dancer roller. The film feed motor is immediately stopped based on the load cell abnormality detection signal that captures the movement as a large load fluctuation, and the film roll is released from the chucking drive means. Thereby, the action of excessive tension on the film is avoided in advance, and the occurrence of an accident such as extension or breakage of the film in the feeding process is suppressed in advance. Finally, the film is drawn out to the full by hand, and the end of a new film is joined to this end portion, and the next film feeding operation is started.
JP 10-2445014 (paragraphs [0014] to [0016], FIG. 1)

Further, there has been proposed a web end detection method and apparatus for a packaging machine that reliably detects the end of the film even when the end of the film is fixed to the paper tube with an adhesive tape or the like (Patent Document). 3). The belt-like film drawn from the original roll loaded in the loading means is transported toward the bag making machine while being wound around a dancer roller that applies tension to the film. The fluctuation position of the dancer roller is detected by the detection signal of the potentiometer. When the end portion of the film is separated from the paper tube, the control means detects the end of the belt-like film when the potentiometer detects that the film has moved to the fluctuation lower limit position. When the end of the film is fixed to the paper tube, the end of the belt-like film is detected by the dancer roller changing to the change upper limit position.
JP 10-129631 A (paragraphs [0024] to [0025], FIG. 1)

  However, the detection of the end of the web material by detecting the displacement of the dancer roller is not possible until the detecting means detects that the dancer roller has displaced more than a predetermined amount. Therefore, the web material ends in the roll body. After that, there is a time delay until the end of the web material is actually detected. In addition, regarding the detection of the end of the web material in which the sensor is in contact with the web material stretched with tension, there is a possibility that malfunction of detecting the end of the web material may occur due to instability of the tension. Such a time delay or malfunction in detecting the end of the web material leads to inability to accurately detect the end. In the operation of a machine such as a packaging machine or the like, if a predetermined tension cannot be obtained on the web material, defective products are generated. Therefore, further improvements are required in terms of increasing the accurate operation and operating efficiency of machines and devices.

Therefore, when you decremental the web material from the roll body winding end of the paper tube is taken web material wound in a state of being fixed to the paper tube, when the feeding reaches the end of the web material , early termination of the web material wound on the roll body by the guide rollers the web material is rotated is wound around Noting that shows the rotation behavior of the termination JP Yes, detects the rotation direction of the guide roller In addition, there is a problem to be solved in that it can be reliably detected.

An object of the present invention is to feed a web material wound on a roll body in a state where a winding end portion of the paper tube is fixed to the paper tube, and when the feeding reaches the end of the web material, It is an object of the present invention to provide a web material end detection device that can detect the end of a material early and reliably.

In order to solve the above-mentioned problem, the web material end detection device according to the present invention is a web material roll wound around a paper tube in a state in which a winding end portion around the paper tube is fixed to the paper tube. An end detection device for the web material fed out from a body, the guide roller guiding the web material fed out from the roll body, a rotation direction detection means for detecting the rotation direction of the guide roller, and the rotation direction detection means And a termination determination unit that determines a termination of the web material according to the reversal of the rotation direction of the guide roller detected based on a detection signal from the web. When the web material is unwound to the winding end and immediately after the web material is unwound from the roll body to the winding end, the web material is rotated by inertia of the paper tube. The direction of rotation of the guide roller is based on the detection signal detected by the rotation direction detecting means with respect to the direction of rotation of the guide roller. In response to detecting the reversal of the web material .

According to this web material end detection device, when the web material wound on the paper tube of the roll body is fed out to the end with the winding end to the paper tube being fixed to the paper tube, At the moment, the paper tube tends to continue to rotate in the same feeding direction due to the rotational inertia . The web material fed to the end is slightly wound around a paper tube that continues to rotate in the same direction. The guide roller that guides the web material fed out from the roll body rotates in the opposite direction to that during feeding by the web material wound in the reverse direction. This rotation in the opposite direction can be detected by the rotation direction detecting means even for a slight amount of rotation until one rotation is made, for example. The termination determination unit detects that the rotation direction of the guide roller is reversed based on the detection signal from the rotation direction detection unit, and further determines that the web material has been fed to the termination based on the detection .

At the end detector of the web material, the direction of rotation detection means comprises a detection object, and the guide rollers detectable detectors passage of the detection object is positioned in the vicinity of rotating with the guide roller It can be configured. When the detection element rotates together with the guide roller, the detection element disposed in the vicinity of the guide roller detects the detection element that passes by the detection element.

  In the web material end detection device including the detection element and the detection element, the detection element is a blade arranged to be spaced apart in the rotation circumferential direction of the guide roller, and the detection element is the guide roller. It can be assumed that the two sensors are spaced apart in the rotational circumferential direction. When the guide roller rotates, the blades as detectors arranged in the circumferential direction of the guide roller pass through two sensors arranged in the circumferential direction of the guide roller. At this time, the rotation direction of the guide roller can be detected depending on which sensor detects the passage of the blade first.

  In the web material end detection device, the web material adsorbing means that adsorbs the web material in accordance with the end determination of the web material by the end determination means along the web material traveling into the guide roller. Can be arranged. When the end determining means determines the end of the web material, the web material adsorbing means provided on the traveling entrance side of the web material of the guide roller adsorbs the web material and performs a termination process such as paper splicing. To make it easier.

  In the web material end detection device provided with the web material adsorbing means, the web material adsorbing means includes an adsorbing plate wider than a width of the web material, and the adsorbing plate includes the web material. A slit that extends in the transverse direction of the web and into which the cutter for cutting the web can enter, and suction holes that are arranged on both sides of the slit and along the slit and connected to a negative pressure source. it can. The web material is adsorbed by placing the entire width on the adsorption plate of the web material adsorption means. By moving the cutter along a slit extending in the transverse direction of the web material on the suction plate, the web material is cut leaving the end side. Further, even after cutting, the web material sent to the guide roller side and the web material that remains somewhat on the paper tube side are adsorbed and held in the adsorption holes.

  In the web material end detection device, the web material may be a web-shaped packaging material for packaging a product. The web-like packaging material for packaging should be supplied to the packaging machine with uniform tension from the beginning to the end to prevent the production of defective products. Termination needs to be done quickly and accurately. This web material end detection device is suitable for detecting the end of a web-like packaging material for product packaging.

Since the end detection device for a web material according to the present invention is configured as described above, the web wound around the paper tube of the roll body with the winding end portion around the paper tube fixed to the paper tube. material is fed from the roll body Runisaishite, by detecting the direction of rotation of the guide rollers the web material is rotated wound, the rotational direction of the guide roller caused by the web material is fed until its end inverted Can be detected soon before the reversal is completed once, and the end of the web material wound around the roll body can be detected early and reliably.

  Hereinafter, embodiments of a web material end detection device according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing a web material supply unit to which a web material end detection device according to the present invention is applied. FIG. 2 is a plan view showing a main part of the web material supply unit shown in FIG.

  According to the web material supply unit shown in FIG. 1, the web-shaped packaging material Fw is initially wound around a paper tube T to form a roll body R (shown by an imaginary line). The roll body R is gripped by a known chuck shaft 1 passed through the paper tube T, and is rotatably supported by shaft support portions 2 and 2 at both ends. The packaging material Fwe on the end side is attached to the paper tube T by the adhesive tape A. Instead of the adhesive tape A, it may be directly attached with an adhesive.

  The web-shaped packaging material Fw of the roll body R is supplied to the packaging machine so as to be rewound from the paper tube T by a driving force from a driving source such as a motor as the packaging machine is operated. It is gradually consumed (see the direction of arrow D1 in FIG. 3). The web-shaped packaging material Fw fed out from the roll body R is guided by a plurality of guide rollers 3 and guide rollers 4 and supplied to an apparatus / machine using the web-shaped packaging material such as a packaging machine. Each guide roller 3, 4 is rotatably supported by an appropriate shaft. Since the tension is acting on the web-shaped packaging material Fw, the guide rollers 3 and 4 rotate without slipping with respect to the web-shaped packaging material Fw.

  As shown in FIGS. 1 and 2, the guide roller 4 is provided with a rotation direction detecting means 5 that detects the rotation direction of the guide roller 4. The rotation direction detection means 5 has two blades 6 and 6 disposed as spaced apart in the rotation circumferential direction at one end of the guide roller 4 as a detector to be rotated together with the guide roller 4. In addition, as a detector capable of detecting the detection target, the sensor has two sensors 7a and 7b that are arranged in the vicinity of the guide roller 3 at the same one end of the guide roller 3 and spaced apart in the rotational circumferential direction. Yes. The sensors 7a and 7b are mounted on a mounting plate 8 fixed to the machine frame. The blades 6 and 6 can be made of an appropriate material depending on the detection method. Although two blades 6 are provided, this is for increasing the resolution of rotation of the guide roller 4, and the number of blades 6 may be another number. The sensors 7a and 7b can be arbitrary sensors as long as they can detect the passage of the optical and magnetic blades 6 and the like.

  When the blades 6, 6 that are the detection elements rotate together with the guide roller 4, the detection elements are disposed in the vicinity of the guide roller 3. Next to the sensors 7a and 7b, one after another. By using a plurality of sensors, the rotation direction of the guide roller can be known from the detection order of the blades 6. That is, the circumferential width of the blade 6 is larger than the circumferential distance between the sensors 7a and 7b, and the circumferential distance between the blades 6 and 6 is shorter than the circumferential distance between the sensors 7a and 7b. For this reason, there are cases where the sensors 7a and 7b both detect the blade 6 and when they do not detect the blade 6. The rotation direction of the guide roller 4 depends on which side the sensor detects the blade 6 when detecting the blade 6. Can be detected.

  When the guide roller 4 rotates in the forward direction, the blade 6 is detected by the one sensor 7 a and turned ON along with the rotation, but the other sensor 7 b is OFF without detecting the blade 6. When the rotation of the guide roller 4 further proceeds, the blade 6 is detected by both the sensors 7a and 7b, and both are turned on. When the rotation of the guide roller 4 further proceeds, the sensor 7a that previously detected the blade 6 is turned OFF, but the other sensor 7b continues to detect the blade 6 and maintains the ON state. When the rotation of the guide roller 4 further proceeds, the other sensor 7b does not detect the blade 6 and is turned off. By comparing and judging such a change between the ON state and the OFF state, when the guide roller 4 rotates in the reverse direction, the detection order of the blades 6 comes first from the sensor 7b. You can know the direction of rotation.

  A mechanism for detecting the end of the web-shaped packaging material Fw is shown in FIG. When the web-shaped packaging material Fw is drawn out to its end, at that moment, the paper tube T tries to continue to rotate in the same feeding direction due to inertia. At this time, the web-shaped packaging material Fw is slightly in the reverse direction (refer to the direction of D2 shown by a broken line) from the most drawn-out state to the winding direction that has been wound by the paper tube T that continues to rotate. It is wound up. As a result, the guide roller 4 rotates in the direction (E2 direction) opposite to that when the web-shaped packaging material Fw is fed. This rotation in the opposite direction is detected by the rotation direction detecting means 5 at an early stage until one rotation is made in the opposite direction. The end determination means 9 detects that the rotation direction of the guide roller 4 has been reversed based on the detection signal from the rotation direction detection means 5, and further determines that the web-shaped packaging material Fw has been fed out to the end based on that. judge.

  A web material adsorbing means 10 capable of adsorbing the web-shaped packaging material Fw is disposed on the traveling entrance side of the web-shaped packaging material Fw of the guide roller 4. The web material adsorption | suction means 10 is arrange | positioned in the form along the driving | running route of the web-shaped packaging material Fw, and is provided with the adsorption | suction plate 11 which has the width W wider than the horizontal width w of the web-shaped packaging material Fw. The suction plate 11 is formed with slits 12 extending in the transverse direction of the web-shaped packaging material Fw and allowing the cutter to pass therethrough, and suction hole arrays 13 and 13 extending along the slits 12 on both sides of the slit 12. . Each suction hole row 13 can suck and hold the web-like packaging material Fw by, for example, a negative pressure generated with an ejector that blows out air.

  The web material adsorbing means 10 operates immediately and adsorbs the web-shaped packaging material Fw when the end determination means 9 determines the end of the web-shaped packaging material Fw. The web-shaped packaging material Fw is adsorbed in a state where the full width is placed on the adsorption plate 11 of the web material adsorption means 10. By moving the cutter blade edge along the slit 12 formed in the suction plate 11, the web-like packaging material Fw is attached to the packaging material Fw1 on the packaging machine already supplied and the paper tube T. The end side packaging material Fwe is cut. Even after cutting, the packaging material Fw1 and the packaging material Fwe are sucked and held by the suction hole arrays 13 and 13, so that it is easy to perform termination processing such as paper splicing. The adsorbing operation of the web material adsorbing means 10 can be canceled by an appropriate switch operation or valve opening / closing operation by an operator.

  The web-like packaging material Fw for packaging should be supplied to the packaging machine with a uniform tension regardless of the web material from the beginning to the end in order to prevent the production of defective products. According to the apparatus, when a termination is detected, termination processing such as paper splicing can be performed quickly and accurately. In addition, although the web material was demonstrated as the web-shaped packaging material Fw which wraps a product, it is applicable to supply from the roll body which wound paper and a film besides that.

It is a perspective view which shows the web material supply part with which the web material termination | terminus detection apparatus by this invention is applied. It is a top view which shows the principal part of the web material supply part shown in FIG. It is a side view of the web material supply system containing the web material supply part shown in FIG. It is the schematic of the conventional termination | terminus detection apparatus of a web material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chuck shaft 2 Axis support part 3 Guide roller 4 Guide roller 5 Rotation direction detection means 6 Blade 7a, 7b Sensor 8 Mounting plate 9 Termination determination means 10 Web material adsorption means 11 Adsorption plate 12 Slit 13 Adsorption hole row 14 Suction hole Fw Web Packaging material T Paper tube R Roll body A Adhesive tape Fw1 Packaging material on the packaging machine side Fwe Termination side packaging material w Width of web-like packaging material Fw W Width of suction plate 11

Claims (6)

An end detection device for the web material that is fed out from a roll body of the web material that is wound around the paper tube in a state where a winding end portion to the paper tube is fixed to the paper tube ,
Guide rollers for guiding the web material fed from said roll body, the rotational direction of the guide rotation direction detecting means for detecting a rotational direction of the roller, and the guide roller detected based on the detection signal from the rotation direction detecting means of it has a termination determination means for determining the end of the web material in accordance with the inversion,
The termination determination means is configured such that when the web material is fed from the roll body to the winding end portion and immediately after the web material is fed from the roll body to the winding end portion, the paper tube is rotated by inertial rotation of the paper tube. When the web material is wound in a direction opposite to the winding direction in which the web material has been wound up until then, based on the detection signal detected by the rotation direction detecting means with respect to the rotation direction of the guide roller, the guide An apparatus for detecting the end of a web material, comprising: determining an end of the web material in response to detecting a reversal of a rotation direction of a roller . The rotation direction detection means, according to claim 1 comprising a further comprising a detection object, and the guide rollers detectable detectors passage of the detection object is positioned in the vicinity of rotating with the guide roller Web material end detection device.   Since the detected element is a blade disposed in the rotational circumferential direction of the guide roller, and the detector is two sensors disposed in the rotational circumferential direction of the guide roller. The web material end detection device according to claim 2.   The web material adsorbing means for adsorbing the web material in accordance with the end determination of the web material by the end determining means is disposed along the web material that travels into the guide roller. The termination | terminus detection apparatus of the web material of any one of -3.   The web material adsorbing means includes an adsorbing plate wider than a width of the web material, and the adsorbing plate has a slit extending in a transverse direction of the web material and capable of entering a cutter for cutting the web. 5. The web material end detection device according to claim 4, wherein suction holes are formed on both sides of the slit and along the slit and connected to a negative pressure source.   The said web material is a web-shaped packaging material which wraps a product, The termination | terminus detection apparatus of the web material of any one of Claims 1-5.

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