JPS61217455A - Nip mechanism in sheet material transport apparatus - Google Patents

Abstract

PURPOSE:To prevent generation of creases in a sheet material and breakage of the sheet material by rotating a free roll near the peripheral velocity of a driving roll when the free roll separates from the driving roll, and detaching the free roll from driving means just before pressing, whereby after pressing, the peripheral velocity of the free roll is matched with that of the driving roll in a short time. CONSTITUTION:When a free roll 2 separates from a driving roll 1, a pulley 3 of a free roll 2 is pressed to a belt 5 driven by a driving pulley 6 so that the free roll 2 is rotated. When the free roll 2 is pressed to the driving roll 1 from such condition, the pulley 3 is separated from the belt 5, and the free roll 2 is rotated by rotation of the driving roll 1. As the free roll 2 is thus previously rotated before the roll 2 is pressed to the driving roll 1, there is a small difference in peripheral velocity between the roll 2 and the driving roll 1. Accordingly, the peripheral speed of the free roll 2 becomes equal to that of the driving roll 1 with a little speed change. Thus, a sudden speed change is not caused at the time of pressing to prevent breakage of a sheet material, and the generation of creases in the sheet material, and to prevent abrasion of the rolls.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a nip mechanism in a seven-tape conveying device used in the manufacturing process of sheet-like materials such as synthetic resin films.

[Prior art]

For example, in an apparatus for producing a sheet-like material from a polymer, a conveying device is used to transport the sheet-like material between each process such as a sheet stretching process. With this device, in order to prevent fluctuations in the previous process from being transmitted to the winding and other subsequent processes, and conversely, to prevent fluctuations in the latter process from being transmitted to the previous process, it is possible to prevent slippage between the roll and the sheet material. A nip mechanism is used to stabilize the conveyance of objects.

The nip mechanism commonly used in the past consists of one or two drive rolls in fixed positions and one seven-ree roll that is swingable by a swing mechanism.

If all the rolls are driven in such a conveyance process using two sets of rolls, it is necessary to keep the circumferential speed of each roll very precisely the same. In other words, if there is even a slight difference in the circumferential speed of each roll, the sheet-like material will be scratched or wrinkled.

Moreover, if the difference in the circumferential speed of each roll is large, the sheet-like material may break.

In order to solve the above problem, in a nip mechanism consisting of two or three rolls, one of the rolls is a free roll. However, in the case of a single cuffed roll as in the conventional nip mechanism, at the moment this free roll is pressed against the drive roll, the free roll changes from zero circumferential speed to a circumferential speed equal to the circumferential speed of the drive roll. is rapidly accelerated to speed. As a result, slippage occurs between the drive roll and the free roll, which causes both ends -A/
Sheets often break when held between
Wear on the roll surface is also a problem. Furthermore, if the sheet-like material breaks, problems such as winding around the roll may occur.

The above-mentioned problems reduce the yield of sheet manufacturing, and when a broken sheet gets wrapped around a roll, the operation must be stopped and the wrapped sheet must be removed before operation can be resumed. Not only that, but the operation is stopped during that time, which lowers the operating rate.

In particular, today's sheet-like manufacturing equipment tends to be faster and wider, and the higher the speed, the wider the rolls, and the larger the rolls, the more the above problems occur. This is easy to do, and it takes a long time to process when it occurs.

[Problem that the invention seeks to solve]

Due to the above-mentioned circumstances, it is necessary to keep the circumferential speed of the drive roll and free roll almost constant during pressure contact, so that the sheet-like material does not wrinkle or break during transportation. .

[Means for solving problems]

In the present invention, when the free roll is separated from the drive roll, the drive means rotates the free roll at a circumferential speed close to the circumferential speed of the drive roll, and the free roll is separated from the drive means at least immediately before the free roll is pressed against the drive roll. By doing so, the circumferential speed of the 7-ree roll becomes equal to the circumferential speed of the drive roll in a short time after crimping, and the change in the circumferential speed at that time can be reduced.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing a first embodiment of the present invention, and in this figure, 1 is a drive roll, and 2 is configured to be crimped onto or separated from the drive roll 1 by means described later. The free roll, 3 is a pulley fixed to the end of the shaft 4 of the free roll 2, and 5 is a belt that is placed around the drive pulley 6 and the idler 7. As shown in FIG. When it is pressed against the drive roll 1, it is separated from the pulley 3 (as shown in Fig. 1).
As shown in , when the free row /I/2 is separated from the drive row /I/1, it is placed in a position where it is pressed against the pulley 3.

Since the configuration is as described above, Figure 1 CB)
In a state where the free roll 2 is separated from the drive roll 1 as shown in FIG. 1, the pulley 3 of the free roll 2 is pressed against the belt 5 being moved by the drive pulley 6, so the free roll 2 is rotated. When this state is changed to the state shown in FIG. 1 in which the free roll 2 is pressed against the drive roll 1, the pulley 3 is separated from the belt 5 and the free roll 2 is rotated by the rotation of the drive roll 1. In this way, since the free roll 2 is rotated in advance before being pressed onto the drive roll 1, the difference between the circumferential speed of the drive roll 1 and the circumferential speed is small, so that the circumferential speed becomes equal to the circumferential speed of the drive roll 1 with a small speed change. . In this case, it is desirable to set the moving speed of the belt 5 so that the circumferential speed of the free roll 2 is approximately equal to the circumferential speed of the drive roll.

As a means for press-bonding and cutting the free-row/I/2 to the drive roll 1, the means shown in FIG. 5 or 6 can be considered.

FIG. 5 shows an arm 21 that supports a 7-ree roll 2 at one end and is rotatable around a shaft 22, and a cylinder 23 with a rod 24 fixed to the other end of the arm 21. 21 is rotated to change the state in which the free roll 2 is pressed against the drive roll /L/1 shown by the solid line to the state separated from the drive roll 1 shown by the chain line. Further, 30 is a sheet-like material.

FIG. 6 shows the free roll 2 using the slide rail 25.
By moving the roller in a straight line, the state is changed between a state in which it is pressed against the drive roll 1 as shown by a solid line and a state that is separated from the drive roll /I/1 as shown in a chain line.

FIG. 2 is a diagram showing the configuration of a second embodiment of the present invention, and similarly, in Figure 2, the free roll 2 is pressed against the drive roll 1, and in Figure 2, the free roll 2 is pressed against the drive roll 1. It is in a remote state.

In this second embodiment, an idler that movably holds the belt is made swingable, so that the tension on the belt is always approximately constant. In other words, in Fig. 2, 8 is another idler, 9 is an arm rotatably supported around a fulcrum shaft 10, the idler 8 is attached to the tip of the arm, and the other end is connected to the rod 12 of the cylinder 11. has been done. Note that 13 is an air supply path for pressure adjustment. Since the other configurations are substantially the same as those of the first embodiment shown in FIG. 1, the same parts are given the same reference numerals in the drawings, and the explanation of each part will be omitted.

Since this embodiment has the above-described configuration, the tension of the belt 5 can be adjusted by adjusting the position of the swingable idler 8 by adjusting the pressure of the air from the air supply path 13 that is supplied only to the rod side. This is so that you can adjust it.

Also, the free roll when changing between the state in which the free roll 2 is pressed against the drive roll 1 shown in Fig. 2 and the state in which the free roll 2 is separated from the drive roll 1 as shown in Fig. 2). Even if the path of the belt 5 by the pulley 3 provided at /I/ 2 changes and the idler 8 moves to follow this change, the belt 5 is always held at a constant tension. In this case, a spring may be used instead of the cylinder 11, but in the case of a spring, the tension of the belt changes depending on the displacement of the spring, so it is preferable to use the illustrated cylinder. The same effect can also be obtained by holding the support member of the idler 8 in a slidable manner, attaching a rack to the support member, meshing the pinion with the rack, and applying a constant torque to the pinion.

In this embodiment, a system in which the idler swings using the arm 9 is adopted, but a system in which the idler slides on a straight line may also be used.

In the first embodiment, the idler 7 may be oscillated to provide the same effect as this embodiment.

In the first and second embodiments, a belt 5, a drive pulley 6, and an idler 7.8 are used, but instead of these, other transmission means such as a chain and sprocket or a rope and a rope wheel may be used. A nip mechanism having the same functions and effects as those of both of the embodiments described above can be constructed. However, in the case of a transmission means consisting of a chino and a sprocket, the free is 1 le 2
Care must be taken to ensure smooth connection between the sprocket provided at the end of the shaft and the chino.

FIG. 3 is a diagram showing a third embodiment of the present invention. This embodiment differs from the other embodiments in that the rotation of the drive pulley is not transmitted via a belt but directly to a pulley provided on the free roll. In other words, as shown in Fig. 3 (G) and (C), the free roll 2 is moved relative to the drive pulley 6 which is fixedly arranged at a specific position, and the pulley 3 changes to the separated position and the crimped position. The rotation of the drive pulley 6 is transmitted to the pulley 3 of the free roll 2 by frictional transmission at the crimping position shown in FIG. 3(6).

In this case, in addition to the friction transmission using the pulley, the driving pulley 6 and the free roll pulley 3 may be replaced with gears, etc., and transmission may be performed by meshing teeth. However, in this case as well, care must be taken to ensure that the gears mesh smoothly.

FIG. 4 is a diagram showing a fourth embodiment of the present invention, in which a clutch is used to connect and disconnect the drive source for pre-rotating the free roll.

In the figure, reference numeral 21 denotes an arm, for example, as shown in FIG. 5, which moves to hold the free roll 2 and change the state between the state of contact with the drive roll 1 and the state of separation. 15 is a bracket 16 and 17 attached to the arm 21 with a clutch.
It is maintained at 18 is a coupling that couples the clutch 15 with the shaft 4 of the free roll 2 rotatably supported by a bearing 19; 20 is a drive source for rotating the free roll 2;

In the case of this embodiment, just before the free roll 2 is pressed against the drive roll 1, the clutch is disengaged by the action of a limit switch (for example, placed at the position indicated by the reference numeral 26 in FIGS. 5 and 6). , free row/L/2 can now rotate freely. Conversely, when the free roll 2 separates from the drive roll 1, it is connected and rotated by the drive source 2Q.

In FIG. 4, the clutch 15 is attached to the bracket 16 t.
Although it is attached to the arm by 17, free roll 2
The coupling 19 between the clutch 15 and the clutch 15 should be an eccentric coupling, or a belt.

It is also possible to attach it to a location other than the arm by using a transmission mechanism using a chino or the like.

Although FIGS. 5 and 6 show limit switches arranged, limit switches are not particularly required in embodiments other than this fourth embodiment. In addition to the above embodiments, The free roll is connected to the drive source via a one-way clutch, and the rotation speed of the free roll by the drive source is made smaller than the rotation speed of the drive roll, so that when the 7-ree roll is separated from the drive roll, the free roll is driven. It may be rotated at a circumferential speed slower than the roll, and when pressed against the drive roll, it may be slightly accelerated by the drive roll and then rotated at the same speed as the drive roll.

During this pressure bonding, the circumferential speed of the drive source that rotates the free roll is smaller than the circumferential speed of the drive roll, so the free roll is kept in a free state by the one-way clutch.

As a drive source for preliminary rotation of the 7-ree roll in each of the above embodiments, a drive motor exclusively for preliminary rotation may be provided. However, since the conveyance speed of the sheet material is changed as appropriate, the speed of the free roll 2 must also be changed in order to always keep the rotation of the drive roll and the preliminary rotation of the free roll 2 at almost the same speed. It is not desirable to provide a mechanism for speed control as this would increase the cost. Therefore, it is desirable that the rotation by the drive motor used to rotate the drive roll 1 is transmitted by a transmission mechanism and used as a drive source. In this case, 7 Lee roll 2
There is no need to rotate the 7-ree roll when the 7-ree roll is crimped to the drive roll 1, and 71) - it is pre-rotated only when the roll is released from the drive roll, and then the 7-ree roll is rotated just before the 7-ree roll is crimped to the drive roll. The speed may be approximately equal to the rotational speed. Therefore, in the first to third embodiments, there is a gap between the drive motor that rotates the drive roll 1 and the drive pulley, and in the fourth embodiment, the drive roller , +1
A clutch may be provided between the drive motor that rotates the motor and the clutch, and the clutch may be used to drive the motor only when necessary. The clutch used at this time must be a powder clutch or a friction clutch because it must be turned on and off while the drive motor is in operation.

〔Effect of the invention〕

As described above in detail based on the embodiments, the nip mechanism of the present invention is designed so that the circumferential speed of the free roll is always approximately equal to the circumferential speed of the drive roll before crimping the free roll to the drive roll. There is no significant change in speed, so there is no breakage or wrinkling of the sheet material, and there is no wear on the rolls.

[Brief explanation of the drawing]

1 to 4 show the first to fourth parts of the nip mechanism of the present invention.
Figures 5 and 6, which show the configuration of this embodiment, both show a free roll being crimped onto a drive roll. It is a figure which shows the mechanism when separating. 1... Drive roll, 2... Free roll,
3...Boo 1) +, 4...Free roll axis,
5...Belt, 6...Drive pulley, 7
,8°...Idler, 9...Arm, 1no...
・Cylinder, 15...Clutch, 20...
Drive source, 30.Pasito-like object. Figure 1 Figure 2 Figure 3 (A) (B) Figure 4

Claims (4)

[Claims] (1) A drive roll for conveying a sheet-like material, a free roll disposed so as to be able to press against and separate from the drive roll, and a preliminary rotation of the free roll at approximately the same circumferential speed as the drive roll. 1. A nip mechanism in a sheet conveying apparatus, comprising: a drive source for imparting rotation; and a rotation transmitting means configured to transmit rotation by the drive source during separation and cut off at least before crimping. (2) The rotation transmission means includes a pulley rotated by the drive source, at least one idler, and a belt hooked around these pulleys and the idler, and when the pulley provided on the axis of the free roll is separated, The nip mechanism in the sheet-like material conveying device according to claim 1, wherein the nip mechanism is configured to be pressed against the belt. (3) One of the idlers is connected and held to a tension adjusting means, so that the tension of the belt is maintained at a desired value and substantially constant at all times. Nip mechanism in a sheet conveyor. (4) A nip mechanism (5) in the sheet-like material conveying device according to claim (1), wherein the pulley provided on the shaft of the free roll is directly pressed against the pulley rotated by the drive source when separated. ) The shaft of the free roll is connected to the drive source via a clutch, and the clutch is configured to switch between transmission and disconnection based on a signal from a position detection means that detects a position of free roll separation or compression. The nip mechanism (6) in the sheet conveying device according to the scope (1), wherein the drive motor for rotating the drive roll is transmitted via a clutch in order to be used as the drive source.
2), (3), (4), or (5) the nip mechanism in the sheet-like material conveying device.