JPS6331963A - Web rewind device - Google Patents

Abstract

PURPOSE:To make it possible to rewind a web, continuously at a high speed, by actuating a web approach-run device in accordance with a detection signal from a web detector, and by jointing the leading end of a web from a new roll to the trailing end of a web from an old roll while the leading end of the former roll is made to approach-run. CONSTITUTION:During rewinding a web from an old roll 18, the web travels at a constant speed while a guide sheet 50 is rewound from an approach-run device 56 by means of a carrier 58, and is fed to the position of a new roll 20 while the sheet 50 is jointed to the leading end of a web from the new roll 20. Then, the new roll 20 is reversed in rotation in a predetermined wind-up direction to wind up the sheet 50 onto the roll 20 by a length which is required for the approach-run, and then the roll 20 stands by. Then, a web detector 60 detects a length to the trailing end of the web from the roll 18, the approach-run device 56 and the roll 20 rotate in synchronization with each other, and therefore, the leading end 30b of the web from the new roll 20 is towed by the sheet 50 so that the travel speed of the web from the roll 20 comes to be equal to that of the web from the roll 18 within the time during which the sheet 50 has been wound up by the approach-run device 56. Accordingly an abutment joint device 34 is actuated to make it possible to continuously rewind the web at a high speed.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a web unwinding device, and particularly to a device for unwinding a web, and particularly for unwinding the ends of old and new rolls of a thin strip material (hereinafter referred to as a web) such as plastic, paper, or metal foil. The present invention relates to a web rewinding device that joins together and continuously supplies a rewinded web.

[Background of the invention]

Conventionally, web unwinding devices include a roll changer that sequentially replaces an old roll and a new roll, and a web that connects the end of the web of the old roll supplied from the changer with the tip of the web of the new roll in a butt state. butt joint gW. The roll changer changes the position of the new roll and the old roll and supplies the web sequentially, and the web butt joining device joins the new roll's web end by butting the old roll's web end. .

The web rewinding device connects the end of the old roll that has finished unwinding and the web tip of the new roll that is starting unwinding, and continuously supplies the rewinding web.

By the way, various butt splicing devices have conventionally been described as web unwinding devices. For example, special public relations
In Japanese Patent Publication No. 8461, Japanese Patent Publication No. 49-12329, and Japanese Patent Application Laid-Open No. 50-84670, a cutting drum and a cutting/splicing drum are used to superimpose a new web on which unwinding begins and an old web after unwinding. An apparatus for cutting and joining the leading end of a new web and the end of an old web using a joining tape using a cutting and joining drum and a joining drum is disclosed. However, in the web rewinding device disclosed in Japanese Patent Publication No. 48-38461, since the running speed of the old web and the running speed of the new web are different, the running speed of the old web is reduced or stopped completely. It requires web joining and is not suitable for high-speed work.

Another conventional web butting device was published in Japanese Patent Application Laid-Open No. 55-74.
Publication No. 940, JP-A-55-74941, JP-A-55-
No. 74942, JP-A-59-102762, and JP-A-59-102763. In addition to the above-mentioned drawbacks, this device has a structure in which the web end of the new roll is pulled out by a suction drum. The web retention force in the web width direction is small and the joining accuracy is poor.Also, since the web used for run-up is disposable, product loss is large.

Yet another web unwinding device is disclosed in Japanese Patent Application Laid-Open No. 55-48144.
However, since this device performs joining on a new roll, it may have an adverse effect on the product.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to propose a web rewinding device that can continuously rewind a web at high speed. [Summary of the Invention] In order to achieve this, in a web unwinding device equipped with a web butt splicing device for butt joining the web end of the old roll and the web end of the new roll, a web end connected to the web end of the new roll is provided. a web run-up device that winds up the guide sheet and runs the web of a new roll a predetermined distance, and then inserts the web of the new roll into a butt splicing device; a web detector that detects the amount of web remaining on the old roll; The present invention is characterized in that a web run-up device is operated based on a detection signal from the web detector to join the web end of the old roll while running the web leading end of the new roll.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a web rewinding device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a schematic structure of an embodiment according to the present invention, in which a support 12 of a roll changer 11 is erected on a base 10, and a turret arm 14 is mounted on this support 12.
is mounted rotatably about a shaft 16. In the embodiment shown in FIG. 1, the turret arm 14 can rotate intermittently about an axis 16 in 180 degree increments. At both ends of the turret arm 14, an old roll 18 on which the web unwinding operation is completed and a new roll 20 on which the web unwinding operation begins are pivotally supported on shafts 22, 24 so as to be unwindable.

As shown in FIG. 1, the web 30 is unwound from the old roll 18, rolled onto a plurality of guide rolls 32, passed through a butt splicing device 34, and sent out to a winding device (not shown). The machine frame 36 of the butt joint device 34 is supported by two wooden supports 38 via a bridge beam 37.
A cutting drum 40, a cutting and joining drum 42, and a joining drum 44 are rotatably mounted inside the drum 6. The web 30 of the old roll 18 is inserted between the cutting and joining drum 42 and the cutting drum 40 and the joining drum 44, and the web 30 is in rotational contact with a pass roll 46 that rotates together with the cutting and joining drum 42 and a guide roll 48. .

-4. A guide sheet 50 is joined to the tip of the new roll 20, and the guide sheet 50 is wound onto the new roll 20 side by the length necessary for the run-up distance by rotating the new roll 20 in the opposite direction. ing. The guide sheet 50 is rolled onto a roll 52, passed onto pass rolls 54 and 54 provided on a cutting drum 40 in the butt splicing device 34, and wound onto a run-up device 56. Note that the guide sheet 50 wound around the run-up device 56 can be rewound to the position of the new roll 20 via the guide sheet carrier 58.

The butt joint device 34 and the run-up device 56 are connected to the web detector 6
web detector 60
detects the remaining amount of web 30 on old roll 18. The web detector 60 operates the run-up device 56 and the butt splicing device 34 at a predetermined timing by detecting the length to the end of the web.

As shown in FIG. 2, the cutting drum 40 has a cutter 61.
A cutter 62 is attached to the cutting and joining drum 42,
The cutters 61 and 62 are the web ends 30A of the old roll 18.
Then, the web end portion 30B of the new roll 20 is cut. A hollow shaft portion 64 is formed in the cutting drum 40.
4 is supplied with air from an air supply source (not shown). The air outlet 66 is formed in a portion of the cutter 61, and the air inside the hollow shaft portion 64 is blown out from the air outlet 66. The blown air blows the web tip 30B of the cut new roll 20 toward the outer peripheral surface 42A of the cutting and joining drum 42. Further, a hollow portion 68 is formed in the cutting and joining drum 42, and the inside of the hollow portion 68 is suctioned by an external suction blower (not shown). An air suction lower 0 is formed in the cutter 62 portion, air is sucked from the suction lower 0, and the web end 30A is sucked into the suction lower 0. As a result, the web end 30A and the web leading end 30B move along the outer peripheral surface 42A of the cutting and joining drum 42 to the joining position of the joining drum 44, as shown in FIG.

The joining drum 44 also includes a hollow portion 72 and a hollow shaft portion 74.
is formed, and the hollow part 72 and the hollow shaft part 74 form a ventilation passage 76.
communicated via. The inside of the hollow portion 72 and the hollow shaft portion 74 are sucked by a suction blower (not shown). A suction lower 8 consisting of a plurality of pores is formed in a part of the outer peripheral surface of the bonding drum 44, and a hollow part 72 formed in the drum 44
It communicates with A bonding tape 80 with the adhesive side facing outward is attached to the surface of the suction lower 8 by suction. Fourth
As shown in the figure, as the splicing drum 440 rotates, the splicing tape 80 is positioned at the butt of the respective cut ends of the old roll's web end 30A and the new roll's web tip 30B, and is configured as described above to join both ends. The operation of the embodiment of the web rewinding device according to the present invention is as follows. As shown in FIG. 5, when the web of the old roll 18 is being rewound, the web of the old roll 18 runs at a constant speed (line ■ in FIG. 5), and in this state, T1 in FIG. The guide sheet carrier 58 is operated for a time T2 from then on, and the guide sheet 50 from the run-up 'Wii Z 56 is rewound by the carrier 58 and sent to the position of the new roll 20 (■ in FIG. 5). A guide sheet 50 is joined to the leading end of the web of the new roll 20. As shown in (■) in Fig. 5, the new roll 20 is reversely rotated in the winding direction at a predetermined speed from T3 to T4, and the guide sheet 50 is wound onto the new roll 20 by the amount necessary for the run-up. Roll 20 is put on standby.

When the web detector 60 detects a predetermined web amount to the end of the old roll 18 at time T9 in FIG.
and the new roll 20 are rotated synchronously. In addition, in order to maintain a constant tension on the guide sheet 50, a run-up device 5 is installed.
6 may be slightly faster than the rotational speed of the new roll 2o.

The web tip 30B of the new roll 2° is a guide sea 1-50.
Towed by. During the time when the guide sheet 50 is wound up by the run-up device 56 (period from T to T6 in FIG. 5), the running speed of the web on the new roll 20 becomes approximately the same as the running speed of the web on the old roll 18. . After this period has elapsed, the butt joint device 34 is activated.

As shown in FIG. 2, in the butt splicing device 34, the distal end portion 30A of the old roll and the distal end portion 30B of the new roll are cut while running at substantially the same speed and overlapped with each other. The web end 30A of the old roll runs while adhering to the outer peripheral surface 42A of the cutting and joining drum 42 due to air suction from the suction lower 0, and the end of the web end 30B is connected to the air outlet 66 from the cutting drum 40. It travels while being pressed against the cutting and joining drum 42 by air. As shown in FIG. 3, the cut end portions of the web end 30A and the web front end 30B are run while being butted against each other, and the abutted portions are joined by a joining tape 80 provided on the joining drum 44. Note that the web cutting waste of the old roll 18 is removed by a removal device (not shown) to the outside of the butt splicing device 34 while being attracted to the suction lower 0, or is rewound onto the rotating shaft 22 of the old roll 18. Further, the web cutting waste from the new roll 20 is taken up together with the guide sheet 50 by the run-up device 56.

After the web end 30A and web leading end 30B of the old roll 18 and the new roll 20 are joined, the unwinding finished roll is rotated 180° counterclockwise in FIG. 1 about the axis 16 of the turret arm 14. A new roll is supplied to the rotating shaft 22, and the state shown in FIG. 1 is repeated again. In this way, the web from the new roll 20 is run up in advance and cut at the same speed as the old roll 18, so the web is smoothly and continuously fed out from the feeding device and taken up by a web winding device (not shown). It will be.

In the embodiment described above, the remaining amount of the web 30 on the old roll 18 is detected by the web detector 60, and the run-up device 58 and the butt joint device 34 are connected only based on the measurement signal of the detector 60.
The operation was controlled. However, the invention is not limited to this, and it may be activated by a measurement signal from the calculation of the remaining length of the old roll 18, or it may be activated by a measurement signal from the remaining length calculation of the old roll 18. A joint detector is provided immediately before the butt joint device 34, and based on the measurement signal of this detector, the
The butt-joining device 34 may be operated reliably by setting the start time of the butt-joining device 34 (time T6) shown in FIG.

Further, in the butt joining device 34 of the above embodiment, the guide sheet 50 is attached to the pass rolls 54 and 54 of the cutting drum 40.
It is rolled up by the run-up device 56. However, the 6th
As shown in the figure, the cutting drum 40 may be provided with an air outlet 90 that communicates with the hollow shaft portion 64, and the guide sheet 50 and the new web 30B may be floated and conveyed by the air blow from the air outlet 90.

〔Effect of the invention〕

As explained above, according to the web rewinding device according to the present invention, a guide sheet is connected to the web tip of a new roll,
This guide sheet is wound up by a run-up device, and the leading end of the new roll is guided into the butt splicing device while running at a constant speed, and the butt-cut splicing is performed by the butt splicing device while keeping the same running speed as the web end of the old roll. This makes it possible to unwind the web continuously at high speed.

Additionally, a guide sheet that can be reused to accelerate the new roll is used, minimizing product loss.

Furthermore, the new web is always under tension due to the run-up device, and good joining accuracy can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the schematic structure of the apparatus of the present invention, Figs. 2 to 4 are detailed cross-sectional views of butt joints of webs, and Fig. 5 is when the apparatus of the present invention is rewinding from an old roll to a new roll. FIG. 6 is a side view showing a modification of the web butt joining device. 11... Roll replacement machine, 18... Old roll,
20...New roll, 30...Web, 30
A... Web end of old roll, 30B... Web tip of new roll, 34... Butt joining device, 5
0... Guide sheet, 56... Run-up device,
60...Remaining web amount detector.

Claims (1)

[Claims] In a web unwinding device equipped with a web butt joining device for butt joining the web end of the old roll and the web end of the new roll, a guide sheet connected to the web end of the new roll, and a guide. a web run-up device that winds up the sheet and runs the web of a new roll a predetermined distance, and guides the web of the new roll to a butt splicing device;
and a web detector that detects the remaining amount of web on the old roll. Based on the detection signal from the web detector, a web run-up device is operated to join the web end of the new roll to the web end of the old roll while running up the web. A web rewinding device characterized by: