JPS6330260B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a roller for conveying or guiding sheet-like or band-like thin objects such as paper, textiles, films, etc. The present invention relates to a conveyance guide roller that can prevent wrinkles from forming.

[Prior art]

Wrinkles may occur when transporting thin sheets or strips, and these wrinkles may cause problems in subsequent processing or processing steps.

For example, if paper wrinkles or the like occur on the surface of copy paper when it is transported in a copying machine, the toner may not be transferred to the copy paper properly during subsequent transfer, resulting in transfer defects and other problems. was.

In addition, ink and
This ink is used when transporting the donor film.
If wrinkles occur on the donor film, when the thermal head records an image on the recording paper via the ink donor film, the wrinkled portion of the ink donor film will not be visible to the thermal head because the films overlap. There was a problem in that the heat was not sufficiently transmitted to the ink, donor film, and recorded images were chipped or faded, making clear recording impossible.

Therefore, the following methods have already been proposed to solve the above problem by preventing the occurrence of wrinkles when transporting thin objects.

(b) Paper is conveyed using thin, tapered rollers, and the tapered rollers apply a tensile force in the width direction to the paper surface to prevent wrinkles (in practical use). (Sho 49-141132).

(b) At least both ends of the feed roller are spread out in a tufted shape, and when the feed roller and the paper sheet are pressed together, the both ends are bent outward, thereby causing the same amount of outward deflection to the left and right ends of the paper sheet. A device that conveys paper sheets while applying force (Jikko 56-
No. 27161).

[Problem that the invention seeks to solve]

However, such conventional technology has the following problems.

In other words, in case (a), the thin roller itself is all formed into a tapered shape, so
When rollers are used for a long period of time, they tend to undergo plastic deformation, and when plastic deformation occurs in the rollers, it becomes impossible to apply the specified tension to the paper, and the force to convey the paper also weakens, making it difficult to ensure reliable conveyance. There is a problem that not only is it impossible to do this, but it also causes wrinkles.

In the case of (b), a roller with approximately the same width as the conveyed object is used, so the plastic deformation of the roller itself is reduced as described in (b) above.
Although it is less likely to occur compared to rollers, since the wrapper-like parts at both ends of the roller apply tension to the thin object and at the same time transport the thin object, the wrapper-like parts at both ends of the roller If the material is plastically deformed, there is a problem that not only tension is applied to the thin material, but also the thin material cannot be transported reliably, which may even cause wrinkles.

[Means for solving problems]

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to prevent the occurrence of wrinkles when transporting or guiding thin sheets or strips. Of course, we also provide a conveyance guide roller that can reliably prevent the occurrence of wrinkles even after long-term use, and can reliably convey thin objects even if plastic deformation occurs in the roller. It's about doing.

That is, in a conveyance guide roller that conveys or guides a sheet-like or belt-like thin object, the roller has a hollow variable part that has elasticity and expands outward in a tapered shape, and this variable part. A continuous solid cylindrical transport section is provided on the small diameter side of the transport section.

[Effect]

This device has a separate variable section that applies tension to the thin object and a conveyance section that conveys the thin object.Since the variable section only applies tension to the thin object, it will not deform plastically even after long-term use. hard. Further, since the thin object is transported by the solid cylindrical transport section, even if the variable part is plastically deformed, the thin object can always be transported reliably.

〔Example〕

The present invention will be described below based on embodiments shown in the accompanying drawings.

FIGS. 1a and 1b show a conveyance device for conveying thin objects to which a conveyance guide roller according to an embodiment of the present invention is applied, and this conveyance device includes a pair of upper and lower rotatable shafts 1, and this shaft 1 It is comprised of a pair of upper and lower conveyance guide rollers 2 which are rotatably mounted under pressure on the left and right ends of the conveyance guide roller 2 .

As shown in FIG. 2, the conveyance guide roller 2 of the present invention used in the above conveyance device includes a solid cylindrical conveyance section 3 fixed to a shaft (not shown),
The conveyance section 3 is composed of a variable section 4 which has elasticity at one end side and expands outward in a tapered shape. The variable portion 4 is hollow and thin and can be elastically deformed freely. Further, the outer circumferential surfaces of the conveyance section 3 and the variable section 4 are formed so that a predetermined frictional force can be exerted between them and the thin object 5 being conveyed.

Therefore, when the conveyance device of the above embodiment is started, the shaft 1 rotates, and the conveyance guide rollers 2, which are fixed to the shaft 1 and are in pressure contact with each other as an upper and lower pair, also begin to rotate. Then, when the thin material 5 in the form of a sheet or band is fed toward the conveyance guide roller 2, the conveyance guide roller 2 bites the thin material 5 near both left and right ends, and then the roller 2 moves toward the conveyance section. 3 applies a conveyance force to the thin article 5, and the thin article 5 is conveyed in a predetermined direction. At this time, since the variable parts 4 are in pressure contact with each other in a pair of upper and lower parts at the contact parts 4a with the thin object 5, these contact parts 4a undergo elastic deformation and are displaced by a length d as shown in FIG. do. At this time, the contact portion 4a of the variable portion 4
An outwardly directed tensile force f is generated, and as a result, a tension is applied to the thin member 5 in contact with the variable portion 4 outwardly in its width direction. For this reason, the thin object 5 is conveyed while being pulled from the center toward both ends, which are the contact areas 5a with the variable part 4, over its upper and lower surfaces, so that wrinkles and the like are prevented from occurring during conveyance. At the same time, wrinkles that have already formed are smoothed out by this conveying device.

In addition to the above, there are other conveyance devices equipped with conveyance guide rollers to which the present invention is applied, such as the fourth conveyor roller.
As shown in the figure, the conveyance guide roller 2 is attached to one end side of a pair of upper and lower shafts 7, and a cylindrical rotating roll 8 having the same diameter as the conveyance part 3 of the conveyance guide roller 2 is attached to the other end side. It is also possible to configure it by attaching it, and in this case, the thin object 5 to be transported is
Although tension is applied in the direction of the conveyance guide roller 2 while being supported by the conveyance section 3 of the roller 2 and the rotating roll 8, the same effect can be obtained.

Further, the conveyance guide roller to which the present invention is applied is
It can also be attached to a guiding device other than the above-mentioned conveying device, such as the one shown in FIG. 5, for example. That is,
This has a structure in which the conveyance guide roller 2 is attached to a shaft 9 provided at each predetermined position, and when the thin strip 10 is pressed against the conveyance guide roller 2 and guided, Thin 10
By applying tension in the longitudinal direction in advance, tension is also applied in the width direction of the thin material 10, and a similar effect can be obtained.

The conveyance guide roller 2 according to an embodiment of the present invention has a relatively shorter length in the rotational axis direction than in the radial direction, and has a variable portion 4 on either the left or right end of the fixed portion 3.
However, the present invention is not limited to this. For example, as shown in FIG.
The length in the shaft 11 direction may be formed to be approximately the same as the width of the thin material, and the center portion 12 side thereof may have a small diameter, and the variable portion 4 may be formed at at least one end side of both ends thereof. Of course it is possible.

〔Effect of the invention〕

As described above, the conveyance guide roller of the present invention has a simple configuration, and by attaching it to, for example, a conveyance device or a guide device, wrinkles can be prevented and corrected at low cost. In addition, since the variable part is provided separately from the conveyance part, the conveyance of thin objects can be carried out mainly in the conveyance part, and since the variable part only needs to apply tension to the thin objects, the variable part can undergo plastic deformation. It is durable and can withstand long-term use. In addition, even if the variable part is plastically deformed, the conveying force can always be obtained by the conveying part, so thin objects can always be conveyed reliably, and even if the variable part is plastically deformed, the conveying force does not change, so it is possible to prevent wrinkles from forming on thin objects. Furthermore, since the variable part is formed hollow, the tension applied to the thin object can be made smaller than when the variable part is formed solid. In particular, when conveying a very thin film such as an ink donor film, if the variable part is solid, the tension that acts on it tends to be excessive, and there is a risk of tearing the film. By making the portion hollow so that it is easily deformed, it is possible to prevent excessive tension from acting on the film or the like, thereby preventing damage to thin objects.

[Brief explanation of the drawing]

1a and b are an explanatory diagram and a plan view of a conveyance device to which a conveyance guide roller according to an embodiment of the present invention is applied, and FIG. 2 is a sectional view of a conveyance guide roller according to an embodiment of the present invention. , FIG. 3 is a partially enlarged view of FIG. 1a, FIG. 4 is a modification of the conveyance device to which the conveyance guide roller according to an embodiment of the present invention is applied, and FIG. 5 is a modification of the conveyance device according to an embodiment of the present invention. FIG. 6, a perspective view of a guide device to which such a conveyance guide roller is applied, is a modification of the conveyance guide roller according to the present invention. Code explanation, 1, 7, 9, 11...shaft, 2
...Conveyance guide roller, 4...Variable part, 5, 10...
...Thin.

Claims (1)

[Claims] 1. In a conveyance guide roller that conveys or guides a sheet-like or belt-like thin object, the roller has a hollow variable part that has elasticity and expands outward in a tapered shape, and a hollow variable part of the variable part. A conveyance guide roller characterized in that a continuous solid cylindrical conveyance section is provided on the small diameter side.