JPH0872120A - Method and device for automatically winding sheet - Google Patents

Abstract

PURPOSE: To automate an operation of winding a relatively thick sheet on a new bobbin and wind the sheet on a new bobbin with efficiency in a safe and reliable manner. CONSTITUTION: When a winding machine is brought to a stop, an extruded sheet S is accumulated upstream of the winding machine. The sheet S is cut in the width direction thereof by a cutter device 52. A leading end S0 of the cut sheet is pressed against a new winding bobbin 44 by a heating roller 46 provided with a heater inside. The new bobbin 44 is rotated to be wound with the sheet.

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 molded by an extruder onto a new winding bobbin,
Particularly, among the plastic sheets, a relatively thick sheet (0.8 to 1.6 mm) is automatically wound on a small-diameter winding bobbin (for example, an outer diameter of about 90 mm) and an automatic winding method for the sheet, Regarding the device.

[0002]

2. Description of the Related Art Conventionally, this type of plastic sheet is
After being formed by an extruder, it is conveyed by using a take-up machine.
A winder for winding a plastic sheet around a bobbin is installed downstream of the winder.

In the winding machine, when the winding of the sheet is completed by one bobbin, the fully wound bobbin is replaced with a new bobbin for winding the next sheet.

FIG. 5 shows this kind of rewinding operation. In FIG. 5, 1 is a plastic sheet and 2 is a winding bobbin. The plastic sheet 1 is cut at a right angle with respect to the sheet flow direction by using a cutter (not shown) as a cutting position at a position advanced by a predetermined length from the winding position on the winding bobbin 2. Next, the pressing rubber roll 3 winds the cut end of the plastic sheet 1 onto the winding bobbin 2
It is to be pressed against 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 the outer peripheral surface of the take-up bobbin 2 in order to attach the end portion of the sheet to a required position.

When the plastic sheet 1 is cut, the pressing rubber roll 3 rolls and presses the leading end of the plastic sheet 1 against the take-up bobbin 2, thereby causing the end of the plastic sheet 1 to pass through the adhesive tape 4. Stick it. After that, as the winding bobbin 2 rotates,
The plastic sheet 1 is adapted to be wound.

[0006]

However, the conventional winding method does not cause a serious problem in the case of a thin plastic sheet, and therefore a flexible plastic sheet, but a relatively thick sheet and a thickness of 0 is obtained. When handling a sheet of 8 mm or more, if you try to wind the cut edge around a new winding roll, even if the edge of the sheet is pressed against the adhesive tape with a pressing roll, it will easily peel off due to the rigidity of the sheet itself. With a small-diameter bobbin, automatic winding may not be possible.

For this reason, when a thick sheet is to be rewound on a new winding bobbin, the winding operation is switched to manual and the winding bobbin is rotated while pressing the just-cut sheet front end by hand to force the sheet. The method of winding it up is taken. This winding operation is extremely inefficient because it is assisted by hand, and there is a problem in safety.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to automate the work of rewinding a sheet having a relatively large thickness, and to automatically and efficiently perform the operation of the sheet. To provide a winding method and its device.

[0009]

In order to achieve the above-mentioned object, a winding method according to the present invention provides a plurality of bobbins for a sheet extruded from an extruder through a take-up machine, a cutter device and a sheet bobbin. In a method for automatically winding a sheet, the sheet is conveyed to a winder equipped with a roller for pressing the sheet, and the bobbin that has been fully wound is switched to a new winding bobbin provided with an adhesive portion to wind the leading end of the sheet. When the winder is stopped, the extruded sheet is accumulated on the upstream side of the winder, the sheet is cut in the width direction by the cutter device, and the leading end of the cut sheet is heated with a heater inside. It is characterized in that the roller is pressed against a new winding bobbin and the new winding bobbin is rotated to wind the sheet.

In this winding method, from the first position where the leading end portion of the sheet is first pressed against the winding bobbin for new winding to heat, the heating roller is moved to the second position along the outer circumference of the winding bobbin. The thickness of the sheet is reduced to 0.8 by rolling it up to the second position and heating it while pressing it at the second position for a certain period of time.
A relatively thick sheet of ~ 1.6 mm can be reliably wrapped.

Further, in order to achieve the above-mentioned object, the winding device according to the present invention includes a plurality of winding bobbins, a cutter device, and a bobbin located at a winding position, which is a new winding bobbin. A sheet winding device that switches to a bobbin for winding and winds a sheet around the bobbin, and a sheet that is extruded from an extruder in conjunction with the stop of the winding machine is accumulated on the upstream side of the winding machine. An accumulator is provided, and a heating roller that is rotatably supported on the peripheral surface of the winding bobbin and that has a heater inside is provided near the winding position of the winding device. It is characterized in that the leading end is pressed against a new winding bobbin for winding.

The accumulator is characterized by having an upper roll and a lower roll on which a sheet is stretched, 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 cumulator operates to accumulate the sheet transferred from the winding machine. .

On the other hand, in the winding machine, the positions of the fully wound winding bobbin and the new winding bobbin are switched, and the cutter device is operated to cut the sheet. After that, the heating roller heats the just-cut sheet leading end while pressing it against the peripheral surface of the newly wound winding bobbin for a predetermined time, so that the surface of the sheet is softened and the peripheral surface of the winding bobbin is rotated. It becomes easier to adhere to the adhesive part.

Then, the heating roller rolls along the peripheral surface of the winding bobbin while continuing to press and heat. As a result, the leading end of the sheet is bent in an arc shape following the peripheral surface of the winding bobbin and is attached to the peripheral surface of the bobbin via the adhesive portion while maintaining its shape. When the rotation starts, the plastic sheet is securely wrapped.

As described above, the accumulation of the sheets in the accumulator and the pressing of the newly wound winding bobbin while heating the leading end of the sheet are combined and wound, so that the rewinding work of the rolls can be automated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an automatic sheet winding method and apparatus according to the present invention will be described below with reference to the accompanying drawings.

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

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

The take-up machine 12 takes up the extruded plastic sheet by using the take-up rolls 19 and 20 at a constant speed. Between the take-up machine 12 and the take-up machine 16, the take-up roll is rewound. An accumulator 14 that temporarily pools the plastic sheets S is arranged to facilitate the operation.

FIG. 3 is a side view of the accumulator 14. The machine frame 21 of the accumulator 14 includes a guide roll 22 on the inlet side and a guide roll 2 on the outlet side.
3 is provided. The lower roll arm 24 and the upper roll arm 25 are swingably supported by 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, 26b are provided, and similarly, the upper roll arm 25 has lower rolls 26a, 2b.
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 laid over the lower rolls 26a and 26b and the upper rolls 28a and 28b as shown in the drawing, and is guided downstream from the guide roll 23 on the outlet side. It is supplied to the automatic winder 16.

Further, 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 of 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 end portion of the piston rod 31 of the air cylinder 30 moves to the lower roll arm 24 via the pin 32. It is connected.

Further, in order to interlock the movement of the lower roll arm 24 with the movement of the upper roll arm 25, the rotary connecting plate 34 pivotally mounted on the rotary shaft 35 of the lower roll arm 24 and the rotary shaft of the upper roll arm 25. The rotary connecting plate 36 pivotally attached to 37 is connected by link rods 38 and 40 forming parallel links.

As shown in FIG. 3, the lower roll arm 24
When is rotated counterclockwise from the position indicated by the phantom line to the position indicated by the solid line, the ring rods 38, 40 transmit this rotation to the upper roll arm 25 and rotate it counterclockwise. And the upper roll arm 25 opens, and the upper rolls 28a and 28b and the lower roll 26
The distance between a and 26b is widened. The plastic sheet S is temporarily stored in this state when the bobbin is rewound.

Next, in FIG. 1, the plastic sheet S is fed from the guide roll 23 on the exit side to the automatic winder 16
Be led to. The automatic winder 16 has a swivel arm 43 supported at an upper part of a machine base 42 so as to be swivelable by 180 °, and take-up bobbins 44 and 45 are provided at both ends of the swivel arm 43. When the take-up bin 44 at the take-up position is fully wound, the revolving arm 43 is turned so that the new take-up bobbin 45 at the standby position can be replaced with the take-up position. Further, a cutter device 52 is arranged at a position separated by a predetermined distance downstream from the take-up bobbin 44 at the take-up position (see FIG. 2), and the plastic sheet S is moved in the width direction by the cutter device 52. The preceding sheet, which has been cut, is wound around the winding bobbin 45 that has been fully wound as it is, and the leading end S0 of the remaining plastic sheet S is wound around the winding bobbin 44 of the new winding 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 adhering the leading end portion S0 of the plastic sheet S first.

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

Here, FIG. 4 is a longitudinal section showing the structure of the heating roller 46. The heating roller 46 is the heater 4
8 is a coaxially built-in type. A hollow shaft is used as the rotary shaft 50 of the roller body 49 made of aluminum, and the rod-shaped heater 48 is attached to the rotary shaft 50.

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

In FIG. 1, the plastic sheet S extruded from the extruder 10 is the rolls 19 and 2 of the take-up machine 12.
It is pulled out and transferred by passing through 0, and is wound around the bobbin 44 of the automatic winder 16 through the accumulator 14.

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 the closed state.

When the plastic sheet S is wound up by the automatic winder 16 by a predetermined length, the operation of the automatic winder 16 is stopped. Then, the accumulator 14 operates based on the operation stop signal to open the upper roll arm 25 and the lower roll arm 24, so that the plastic sheet S transferred from the transaction machine 12 is in the upper stage as shown in FIG. Rolls 28a, 28b, lower rolls 26a, 26b
Accumulated during.

On the other hand, in the automatic winder 16, the turning arm 4 is
The winding bobbin 44 in which 3 is rotated 180 ° and is fully wound
And the position of the empty winding bobbin 45 is switched.

Next, the cutter device 52 operates to cut the plastic sheet S. The heating roller 46 in the first pressing position presses the just-cut sheet leading end portion S0 against the peripheral surface of the bobbin for a predetermined time. During this time, the heater 48 built in the heating roller 46 heats the surface to soften it.

Then, the heating roller 46 rolls to the second pressing position while pressing. At the second pressing position, the pressing state while heating the sheet front end portion S0 is continued for a certain period of time even after the heating roller 46 reaches.

As described above, the leading end portion S0 of the plastic sheath S is bent in an arc shape following the peripheral surface of the winding bobbin 44 by heating at two places, and the shape is maintained so that the circumference of the winding bobbin 44 is maintained. Since the tape is reliably attached to the surface via the adhesive tape 53, the plastic sheet S is automatically wound when the winding bobbin 44 starts to rotate.

[0037]

As is apparent from the above description, according to the present invention, the sheet is accumulated upstream of the winder when the winder is stopped and the sheet is 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 having a heater inside, and is pressed against the adhesive portion of the winding bobbin of the new winding to be wound, so that there is relatively thickness. The rewinding work of the plastic sheet can be automated, and the new winding bobbin can be automatically and safely wound around the new winding bobbin.

[Brief description of drawings]

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

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

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

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

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

[Explanation of symbols]

 10 Extruder 12 Drawer 14 Accumulator 16 Rewinder 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 Swing Arm 44 New Winding Bobbin 45 Full Roll Winding bobbin 46 Heating roller 48 Heater 52 Cutter device

Claims (5)

[Claims] 1. A sheet extruded from an extruder is conveyed through a take-up machine to a plurality of bobbins and a winder provided with a cutter device and rollers for pressing the sheets against the bobbin, and the bobbins that are fully wound are bonded. In the automatic winding method of the sheet, in which the leading end of the sheet is wound by switching to the new winding bobbin provided with a section, the extruded sheet is accumulated on the upstream side of the winding machine when the winding machine is stopped. Then, the sheet is cut in the width direction by the cutter device, and the leading end of the sheet after cutting is pressed against the winding bobbin of the new winding by a heating roller having a heater inside, and the sheet is rotated by rotating the new winding bobbin. A method for automatically winding a sheet, which is characterized in that the sheet is wound. 2. The heating roller is rolled from a first position where the leading end of the sheet is first pressed against a winding bobbin for new winding to heat it to a second position along the outer circumference of the winding bobbin. The method for automatically winding a sheet according to claim 1, wherein the sheet is heated while being pressed at the second position for a certain period of time. 3. A method for automatically winding a sheet according to claim 1, wherein the sheet has a thickness of 0.8 to 1.6 mm. 4. A sheet having a plurality of take-up bobbins, a cutter device, and a bobbin at a take-up position, which is switched from a full take-up bobbin to a new bobbin and a sheet is wound on the bobbin. A winding device and an accumulator that accumulates a sheet extruded from an extruder in association with the stop of the winding device on the upstream side of the winding device, near the winding position of the winding device, A heating roller, which is rotatably supported on the peripheral surface of the winding bobbin and has a heater therein, is provided, and the leading end portion of the sheet is pressed against the new winding bobbin by the heating roller to wind the sheet. Characteristic automatic sheet winding device. 5. The accumulator comprises an upper roll and a lower roll on which a sheet is suspended, and a link mechanism capable of expanding and contracting a distance between the upper and lower roll cores. Automatic sheet winding device.