JP3320914B2 - Automatic sheet winding method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automatic winding of a plastic sheet formed by an extruder onto a newly wound bobbin.
In particular, an automatic sheet winding method for automating a step of winding a relatively thick sheet (0.8 to 1.6 mm) of a plastic sheet around a small-diameter winding bobbin (for example, an outer diameter of about 90 mm) and Regarding the device.

[0002]

2. Description of the Related Art Conventionally, a plastic sheet made of such a thermoplastic resin is formed by an extruder and then conveyed by a take-off machine. Downstream of the take-up machine, a take-up machine that winds a plastic sheet around a bobbin is provided.

When the winding of a sheet is completed with one bobbin, the winding machine replaces the full bobbin with a new bobbin on which a sheet is to be wound next.

FIG. 5 shows such a rewinding operation. In FIG. 5, 1 indicates a plastic sheet, and 2 indicates a winding bobbin. The plastic sheet 1 is cut at a right angle to the sheet flow direction by using a cutter (not shown) with a position advanced by a predetermined length from the winding position on the winding bobbin 2 as a cutting position. Next, the pressing rubber roll 3 applies the cut end of the plastic sheet 1 to the winding bobbin 2.
And is provided so as to be able to roll along the outer peripheral surface of the winding bobbin 2. On the other hand, a double-sided adhesive tape 4 is attached to an outer peripheral surface of the winding bobbin 2 to attach an end of a sheet to a necessary portion.

[0005] When the plastic sheet 1 is cut, the pressing rubber roll 3 presses the leading end of the plastic sheet 1 against the winding bobbin 2 while rolling, whereby the end of the plastic sheet 1 is interposed via the adhesive tape 4. Stick it. Then, as the winding bobbin 2 rotates,
The plastic sheet 1 is wound.

[0006]

However, the conventional winding method does not cause a large problem in the case of a thin plastic sheet, and therefore a flexible plastic sheet. When handling a sheet of .8 mm or more, if the cut end is to be wound around a new roll, the sheet is easily peeled off due to the rigidity of the sheet itself even if the end of the sheet is pressed against the adhesive tape with a pressing roll, and particularly, the radius of curvature is small. With small diameter bobbins, automatic winding may not be possible.

For this reason, when rewinding a thick sheet into a new bobbin, the winding operation is switched to manual, and the take-up bobbin is rotated while pressing the leading end of the sheet just cut by hand, thereby forcibly pulling the sheet. The winding method is adopted. This winding operation is extremely inefficient because of the work assisted by hand, and has a problem particularly in terms of safety.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to automate the operation of rewinding a sheet having a relatively thick thickness so that the sheet can be efficiently and safely and securely. An object of the present invention is to provide a winding method and an apparatus therefor.

[0009]

In order to achieve the above-mentioned object, a winding method according to the present invention comprises a method for extruding a product from an extruder.
A sheet made of thermoplastic resin is transported via a take-up machine to a plurality of bobbins, and to a winder equipped with a cutter device and rollers for pressing the sheets against the bobbin. In the automatic winding method of the sheet in which the leading end of the sheet is wound by switching to the winding bobbin, the extruded sheet is accumulated upstream of the winding machine when the winding machine is stopped, and the sheet is cut by the cutter device. Is cut in the width direction, and the leading end of the cut sheet is pressed against a winding bobbin of a new winding by a heating roller having a heater inside, and the sheet is wound by rotating the new winding bobbin. It is characterized by the following.

In this winding method, the heating roller is moved along the outer periphery of the winding bobbin from the first position where the leading end of the sheet is first pressed against the winding bobbin of the new winding and heated. And heated while pressing at the second position for a certain period of time, so that the thickness of the sheet is 0.8
A relatively thick sheet having a thickness of about 1.6 mm can be securely wound.

In order to achieve the above object, a winding device according to the present invention comprises a new winding bobbin, a cutter device, and a winding bobbin in which a bobbin at a winding position is fully loaded. Switch to the bobbin of the winding and push the bobbin from the extruder
A sheet winding device configured to wind a sheet made of the discharged thermoplastic resin , and an accumulator that accumulates the sheet on the upstream side of the winding machine in conjunction with the stop of the winding machine; A heating roller provided with a heater is provided near the winding position of the winding device and rotatably supported on the peripheral surface of the winding bobbin, and a leading end of the sheet is newly wound by the heating roller. It is characterized in that it is pressed and wound.

[0012] The accumulator has an upper roll and a lower roll over which a sheet is passed, and a link mechanism capable of expanding and contracting the distance between the upper and lower roll cores.

[0013]

When the sheet is wound on the winding bobbin of the winding machine by a predetermined length, the winding machine stops, and during this stop, the accumulator operates to accumulate the sheet transferred from the winding machine. .

On the other hand, in the winding machine, the position of the fully wound winding bobbin and the position of the new winding bobbin are switched, and the cutter device is operated to cut the sheet. Then, the heating roller heats the front end of the sheet just cut against the peripheral surface of the winding bobbin of the new winding for a predetermined time, so that the surface of the sheet is softened and the peripheral surface of the winding bobbin is heated. It becomes easy to adhere to the adhesive part after being adapted.

Then, the heating roller rolls along the peripheral surface of the winding bobbin while continuing pressing and heating. As a result, the leading end of the sheet is curved in an arc shape following the peripheral surface of the winding bobbin, and is adhered to the peripheral surface of the bobbin via an adhesive portion while maintaining the shape. When the rotation starts, the plastic sheet is securely wound.

As described above, the sheet is accumulated in the accumulator and the sheet is wound on the winding bobbin of the new winding while heating the top of the sheet in combination with the pressing, so that the roll rewinding operation can be automated.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an automatic sheet winding method and apparatus according to an embodiment of the present invention.

FIG. 1 is an overall configuration diagram showing the arrangement of each device constituting a plastic sheet forming apparatus including a winding machine according to one embodiment of the present invention, wherein 10 is an extruder, 12 is a take-off machine,
14 is an accumulator, 16 is a winding machine.

The extruder 10 heats and melts and kneads the plastic material supplied from the hopper 17. The extruder 10 is shaped into a sheet having a thickness of 0.8 mm to 1.6 mm and extruded from a sheet die 18. It is supposed to be.

The take-up machine 12 takes up the extruded plastic sheet at a constant speed by using take-up rolls 19 and 20. Between the take-up machine 12 and the take-up machine 16, a take-up roll is wound. An accumulator 14 for temporarily pooling the plastic sheet S is disposed so as to facilitate the operation.

FIG. 3 is a side view of the accumulator 14. The machine casing 21 of the accumulator 14 has a guide roll 22 on the entrance side and a guide roll 2 on the exit side.
3 are provided. A lower roll arm 24 and an upper roll arm 25 are swingably supported on the machine frame 21 via bearings 27 and 29, respectively.
The lower roll arm 24 has a required number, 2 in this embodiment.
Two rolls 26a and 26b are provided. Similarly, the upper roll arm 25 is provided with lower rolls 26a and 26b.
Upper rolls 28a and 28b corresponding to 6b are attached.

The plastic sheet S guided from the guide roll 22 to the accumulator 14 is alternately wound around lower rolls 26a, 26b and upper rolls 28a, 28b as shown in FIG. It is supplied to the automatic winder 16.

In the accumulator 14, the upper roll arm 25 swings in conjunction with the lower roll arm 24, and the lower rolls 26a, 26b and the upper roll 28a,
The distance between the roll cores 28b can be adjusted. In the case of this embodiment, the lower roll arm 24 is driven by the air cylinder 30 to rotate at a fixed angle, and the tip of the piston rod 31 of the air cylinder 30 is connected to the lower roll arm 24 via the pin 32. Are linked.

In order to link the movement of the upper roll arm 25 with the movement of the lower roll arm 24, a rotation connecting plate 34 mounted on a rotation shaft 35 of the lower roll arm 24 and a rotation shaft of the upper roll arm 25. The rotation connection plate 36 which is mounted on the shaft 37 is connected by link rods 38 and 40 forming parallel links.

As shown in FIG. 3, the lower roll arm 24
Is rotated counterclockwise from the position represented by the imaginary line to the position represented by the solid line, the ring rods 38 and 40 transmit this rotation to the upper roll arm 25 and rotate counterclockwise. And the upper roll arm 25 is opened, and the upper rolls 28a and 28b and the lower roll 26
The interval between a and 26b is widened. The plastic sheet S is temporarily stored in this state at the time of bobbin rewinding.

Next, in FIG. 1, the plastic sheet S is fed from the guide roll 23 on the exit side to the automatic winder 16.
It is led to. The automatic winding machine 16 has a turning arm 43 supported on the upper part of a machine base 42 so as to be rotatable by 180 °. Winding bobbins 44 and 45 are provided at both ends of the turning arm 43. When the take-up bin 44 at the take-up position becomes full, the turning arm 43 turns so that the take-up bobbin 45 of the new take-up at the standby position is replaced with the take-up position. A cutter device 52 is disposed at a position downstream of the winding bobbin 44 at a predetermined distance from the winding position (see FIG. 2), and the plastic sheet S is moved in the width direction by the cutter device 52. The cut and preceding sheet is wound as it is on a full winding bobbin 45, and the leading end S0 of the remaining plastic sheet S is wound on a new winding bobbin 44 at the winding position. .
A double-sided adhesive tape 53 is attached to the peripheral surface of the winding hobbin 44 as a means for attaching the leading end S0 of the plastic sheet S first.

As shown in FIG. 2, on the winding bobbin 44 at the winding position, a heating roller 46 is arranged so as to roll along the peripheral surface of the winding bobbin 44. The heating roller 46 rolls downward while pressing the leading end S0 of the plastic sheet S against the take-up bobbin 44 on the first pressing position on the transfer path of the plastic sheet S, and moves to the second pressing position. Is supported by an arm (not shown) so as to be movable.

FIG. 4 is a longitudinal section showing the structure of the heating roller 46. As shown in FIG. This heating roller 46 is
8 is coaxially built-in. A hollow shaft is used as a rotation shaft 50 of the roller body 49 made of aluminum, and a rod-shaped heater 48 is inserted into the rotation shaft 50.

Next, a method for winding the winding bobbin 44 using the heating roller 46 will be described.

In FIG. 1, a plastic sheet S extruded from an extruder 10 is rolled by rolls 19, 2
In the automatic winding machine 16, the paper is drawn out and transported by passing through the accumulator 14 and wound on the bobbin 44 of the automatic winder 16.

During the automatic winding of the plastic sheet S, the upper roll arm 25 of the accumulator 14
The lower roll arm 24 is in a closed state.

When the automatic winder 16 winds up the plastic sheet S by a predetermined length, the operation of the automatic winder 16 stops. Next, based on the operation stop signal, the accumulator 14 operates to open the upper roll arm 25 and the lower roll arm 24. As shown in FIG. 3, the plastic sheet S transferred from the transaction machine 12 is Rolls 28a, 28b, lower rolls 26a, 26b
Is accumulated during.

On the other hand, in the automatic winder 16, the swing arm 4
3. The winding bobbin 44, which is rotated by 180 °, is full.
Then, the position of the empty winding bobbin 45 is switched.

Next, the cutter 52 is operated to cut the plastic sheet S. The heating roller 46 at the first pressing position presses the sheet leading edge S0 just cut to the peripheral surface of the bobbin for a predetermined time. During this time, the surface is softened by heating by a heater 48 built in the heating roller 46.

Then, the heating roller 46 rolls while pressing to the second pressing position. In the second pressing position, the pressing state while heating the sheet leading end S0 is continued for a certain time even after the heating roller 46 reaches.

As described above, due to the heating at two places, the leading end S0 of the plastic sheet S is curved in an arc shape following the peripheral surface of the winding bobbin 44, and retains its shape to maintain the shape of the winding bobbin 44. When the take-up bobbin 44 starts rotating, the plastic sheet S is automatically wound because the surface is securely adhered to the surface via the adhesive tape 53.

[0037]

As is apparent from the above description, according to the present invention, when the winding machine is stopped, the sheets are accumulated upstream of the winding machine, and the sheets are cut in the width direction by the cutter device. After that, the leading end of the sheet is pressed while being heated by a heating roller provided with a heater inside, and is pressed and wound on the bonding portion of the winding bobbin of the new winding, so that the sheet is relatively thick. The rewinding operation of the plastic sheet can be automated, and the sheet can be automatically wound on the newly wound bobbin in a safe and secure manner.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a plastic sheet forming apparatus to which an automatic winding device of the present invention is applied.

FIG. 2 is a configuration explanatory view of a winding device according to an embodiment.

FIG. 3 is a side view of an accumulator arranged upstream of the winding device.

FIG. 4 is a longitudinal sectional view showing a structure of a heating roller with a built-in heater included in the automatic winding device of the embodiment.

FIG. 5 is an explanatory view showing a conventional sheet winding method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 extruder 12 take-up machine 14 accumulator 16 take-up machine 18 sheet die 24 lower roll arm 25 upper roll arm 26 upper roll 28 lower roll 30 air cylinder 38 link rod 40 link rod 43 swivel arm 44 new winding bobbin 45 full winding Winding bobbin 46 Heating roller 48 Heater 52 Cutter device

Claims (5)

(57) [Claims] (1) A thermoplastic resin extruded from an extruder.
A plurality of bobbins of sheet through the take-up device that, cutter device and the sheet is transported to a winding machine provided with a roller pressed against the bobbin, Aramaki winding bobbin having a bonded portion from the bobbin becomes fully wound In the automatic winding method of the sheet in which the leading end of the sheet is wound by switching to the above, the extruded sheet is accumulated at the upstream side of the winder together with the stop of the winder, and the sheet is widthwise moved by the cutter device. The sheet is cut, and the leading end portion of the cut sheet is pressed against a winding bobbin of a new winding by a heating roller having a heater therein, and the sheet is wound by rotating the new winding bobbin. Automatic sheet winding method. 2. A heating roller is rolled from a first position where a leading end of a sheet is first pressed against a new winding bobbin and heated to a second position along the outer periphery of the winding bobbin. 2. The method according to claim 1, wherein the heating is performed while pressing at the second position for a predetermined time. 3. The automatic winding method according to claim 1, wherein the thickness of the sheet is 0.8 to 1.6 mm. 4. A plurality of winding bobbins, a cutter device, and a bobbin at a winding position are switched from a full winding bobbin to a new winding bobbin and extruded from the extruder onto the bobbin .
A sheet winding device configured to wind a sheet made of a thermoplastic resin , and an accumulator that accumulates the sheet on the upstream side of the winding device in conjunction with stoppage of the winding device; Near the winding position of the winding bobbin, a heating roller provided with a heater and rotatably supported on the peripheral surface of the winding bobbin is provided, and the leading end of the sheet is pressed against the new winding bobbin by the heating roller. An automatic sheet winding device characterized by being wound. 5. The apparatus according to claim 4, wherein the accumulator has an upper roll and a lower roll for hanging a sheet, and a link mechanism capable of extending and contracting a distance between the upper and lower roll cores. Automatic winding device for the described sheet.