JPH07106819B2 - Film gripping / conveying roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Use The present invention relates to a film gripping and conveying roll that conveys a flexible film at a constant speed and a constant tension without sliding, using a vacuum suction roll.

(2) Structure of conventional example and its problems Film transfer rolls used in polymer film processing devices, film coaters, film inspecting devices, film winders, etc. have conventionally transferred the roll surface shape to the film to be transferred. , To prevent scratching the film,
A mirror-like roll has been used which has been hard-chrome plated.

Among them, especially where there is a large difference in tension before and after the transport roll, where the wrap angle to the transport roll is small, or where the friction between the roll and the film is small and slippage is likely to occur, vacuum suction holes should be provided on the roll surface. A vacuum suction type carrier roll was used.

FIG. 1 is a cross-sectional view showing one form of a conventional vacuum suction type transfer roll.

Reference numeral 1 is a vacuum suction hole, 2 is an exhaust port for maintaining a vacuum inside the transfer roll, 3 is a rotary seal for maintaining airtightness, and 10 is a roll body.

The above gripping and conveying roll sucks a large amount of air from the vacuum suction hole in the portion where the film is not wound, so a large-capacity exhaust pump is required, and furthermore, the inside of the gripping and conveying roll is kept at a low pressure. A large diameter exhaust port is required.

Furthermore, since the air between the film and the roll is sucked near the point where the film starts contact with the gripping conveyance roll and the point where the film comes off, the contact start point and contact end point (hereinafter referred to as “contact point”) become unstable. Become.

Particularly, at the time of low tension conveyance, the contact point largely moves, which may cause scratches, wrinkles, or meandering on the film. Therefore, as shown in FIGS. 2 (a) and 2 (b), a gripping / conveying roll is proposed in which a leak-proof plate 23 is installed on a portion of the roll main body 22 on which the film 21 is not wound.

Then, as a result of various studies on these, the following findings were obtained.

As shown in FIG. 2 (b), when the leak preventer plate 23 is provided outside the roll body 22, the effect of the leak preventer plate 23 is small.

This is because firstly, it is difficult to bring the leak preventer plate close to the contact point, and there is little effect of suppressing fluctuations in the essential contact point.

Second, it cannot overlap the contact points.

Thirdly, since it is on the surface side of the gripping and conveying roll, the leak preventer must be mounted at a certain distance from the roll surface so as not to damage the roll surface, and this is not enough effect.

In the case of FIG. 2 (a), many of the above-mentioned drawbacks can be eliminated, but the above-mentioned delicate adjustment of the contact point, correspondence to the movement of the contact point, and measures for keeping the pressure in the vicinity of the contact point at atmospheric pressure can be implemented. Absent.

In particular, when the tension is low, the point of vacuum suction of the film is very delicate, and the stability of the film changes greatly even if the contact point is displaced by a few mm.

When the above-mentioned gripping / conveying roll is positioned before and after the unwinding or winding roll, the film contact point on the film gripping / conveying roll moves depending on the winding diameter of the film.

Further, since the angle between the film and the roll is very small in the vicinity of the contact point, if the film is sucked even a little from the vacuum suction hole corresponding to that portion, the film is sucked and becomes unstable. Therefore, theoretically, it is preferable that only the vacuum suction hole at the portion where the film is in close contact has the suction action, and at other portions, especially at the contact points of the film, there is no suction action.

(3) Object of the present invention The present invention has been made based on the above findings, and in the above-described film conveyance and the like, particularly when film gripping force is required, the film is gripped stably by vacuum suction without slipping. It is an object of the present invention to provide a film gripping / conveying roll that conveys a film while conveying it.

(4) Structure of the Invention The above object is achieved by the present invention described below. That is, according to the present invention, in a film gripping / conveying roll that sucks and conveys a flexible film by a vacuum suction port provided on the peripheral surface, the vacuum suction port in a portion where the film is not wound is cut off from the exhaust system. However, the film gripping / conveying roll is characterized in that a blocking means for controlling to atmospheric pressure is provided inside the roll main body so as not to rotate.

As described above, the present invention is a film gripping / conveying roll that conveys a flexible film while sucking it to the surface by vacuum suction, and inside the roll main body having a vacuum suction hole in which the flexible film is not wound, By providing a blocking means capable of relative movement with respect to the contact point with the flexible film, and by connecting the film non-wrapping portion surrounded by the blocking means to the atmosphere, a delicate area near the contact point can be obtained. The film can be gripped and the film can be stably gripped and conveyed.

Hereinafter, the present invention will be described in detail with reference to a vertical film transport roll as an example.

FIG. 3 is a partial cross-sectional view showing the structure of the gripping conveyance roll of the embodiment.

In the figure, 31 is a vacuum suction hole formed in the film transporting section on the entire peripheral surface of the roll body 32, 33 is a roll shaft having an exhaust port 33a for keeping the inside of the transporting roll in vacuum, and 34a, 34b, 35 are rolls. Rotating seal to keep airtight inside the body, 36 is roll body 32
Is an upper bearing for fixing the position of the bearing with a fixing portion 41. Reference numeral 37 is a blocking means for blocking the vacuum suction holes 31 other than the winding portion of the film 30 from the exhaust system, and is configured as shown in FIG. 3 (c). That is, a support cylinder 37a is provided concentrically with the roll shaft 33 so that the position of the support cylinder 37a can be adjusted from the outside around the axis, and the support cylinder 37a has two upper and lower fan-shaped plates 37b whose end faces form a minute gap with the inner surface of the roller.
37c and left and right side plates 37d, 37e, and roller body 32
The film winding portion has an opening facing the inner surface of the film winding portion, and is provided with a box body surrounding the vacuum suction port 31 located on the inner surface.

The box side of the support cylinder 37a is left as a plate, a through hole 37f is formed in the film winding portion side, and the inside of the roller on the film winding portion side communicates with the exhaust system through the exhaust pipe 33a. The inside of the roller below the film winding portion, that is, the vacuum suction hole 31 is blocked by the exhaust system and the box body of the blocking means 37. Therefore, the support cylinder 37a is rotated from the outside so that the film 30
At the optimum position near the contact point between the roll body 32 and
You can set the box.

Generally, the blocking means 37 has an integral structure, and only sets the position relative to the roller as a whole,
For example, it is also possible to divide the blocking means 37 (in this example, the box body) into two pieces, and superimpose them so that they can be opened at the center so that the contact start point and the contact end point of the film can be adjusted. This makes it possible to handle a wide range of winding conditions.

Further, the breaking means 37, specifically around the opening of the box body, is provided with an airtight packing 38 which comes into contact with the inner surface of the roll with a low friction coefficient, so that the breaking of the vacuum of the breaking means 37 can be made more reliable.

Moreover, the communication holes 39, 4 for connecting the inside of the blocking means 37 to the outside air.
By piercing 0, the inside of the blocking means 37 near the contact point is kept at atmospheric pressure to stabilize the film transport.

(Effect of the Invention) As described above, according to the present invention, the vacuum suction port of the portion of the film to be gripped and transported, which is not wound, is blocked from the exhaust system by the blocking means, so that the film is stably and efficiently gripped and transported. It is something to do.

In particular, by making the shut-off means finely adjustable along the circumference of the roll body, and by making the inside surrounded by the shut-off means positively in the atmospheric state, the film transport state near the contact point of the film transport roll Can be stabilized.

Due to this feature, the present invention cannot ignore the effects of a transport roll of a film that can impart only low tension, a high-speed transport roll whose gripping force is reduced by the accompanying air flow, and gravity.
By applying it to a vertical type conveyance roll that conveys the film vertically, a gripping conveyance roll that can perform stable grasping conveyance is realized, which makes a great contribution in industry.

[Brief description of drawings]

FIG. 1 is an explanatory view of a vacuum suction type gripping and conveying roll which has been conventionally carried out, FIGS. 2 (a) and 2 (b) are explanatory views of a conventional leakproof plate arrangement, and FIG. 3 (A) )-(C) are explanatory drawings of the grip conveyance roll of an Example. 1,31: Vacuum suction port, 2,33a: Exhaust port 21,30: Film, 23: Leak prevention plate 10,22, 32: Roll body, 37: Breaking means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References: Showa 55-101852 (JP, U) Showa 61-197043 (JP, U) Showa 52-110839 (JP, U) Show 50- 25828 (JP, Y1)

Claims (3)

[Claims] 1. A film gripping / conveying roll for sucking and gripping a flexible film with a vacuum suction port provided on the peripheral surface and transporting the film while the film is not wrapped around the vacuum suction port from the exhaust system. However, the shutoff means for controlling the atmospheric pressure is provided inside the roll body so as not to rotate, and the shutoff means is positionally adjustable around the axis of the roll, and the shutoff means faces the inner surface of the roll. A film gripping / conveying roll characterized in that it is formed of a box having an opening on the side to be opened, and the periphery of the opening is formed so as to have a minute gap with the inner surface of the roll. 2. The film gripping and conveying roll according to claim 1, further comprising an airtight packing which is in contact with the inner surface of the roll at a low coefficient of friction around the opening. 3. The film gripping / conveying roll according to claim 1, wherein the range of the vacuum suction port for blocking by the blocking means can be adjusted.