JPS6288770A - Sheet shaped material conveying roller - Google Patents

Abstract

PURPOSE:To reduce static electricity troubles by combining materials charged with positive by the friction with a sheet-shaped material and a material charged with negative charges in turn to form the surface of a roller. CONSTITUTION:Parallel grooves are longitudinally bored on a path roller produced with a material 4 charged with negative charges by friction electrification. Materials 3 cut-machined insertably into these grooves to be charged with positive charges are inserted and fixed with an adhesive. Then stop rings 6 are coupled with a shaft section 5 at both ends. The polarities of electrification occurring when the sheet-shaped material is brought into contact with or separated from the surface of a conveying roller are changed in turn by this conveying roller than essentially offset, and static electricity troubles can be prevented from occurring.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a roller for conveying a sheet-like object such as a belt-like object (also referred to as a "web") or a sheet-like object, and a roller for conveying a sheet-like object such as a strip-like object (also referred to as a "web") or a sheet object, This paper proposes a novel structure of a cylindrical e-slower used in the manufacturing process, processing process, or utilization process of recording materials such as recording materials and heat-sensitive recording materials, and their supports.

[Prior art]

Conventionally, when conveying a sheet-like object, it has often been conveyed by a metal path roller made of stainless steel or aluminum. However, when the sheet-like material came into contact with the surface of the gold pA nozzle roller and peeled off, charging occurred, often causing electrostatic damage to each vertebra. Particularly when carrying out high-speed conveyance, the number of rotations of the pass roller increases extremely, causing slippage between the sheet-like material and the pass roller, causing local frictional force and causing electrostatic damage.

As a way to prevent this, for example, applying a special resin treatment to the surface of the metal pass roller is disclosed in U.S. Patent No. 2 Tata A, A.
A pass roller having a matte surface is disclosed in the specification of Kou No. 6 and in Japanese Utility Model Publication No. 52-2311J. However, since charging is a complex and subtle surface phenomenon, these methods are not stable and cannot completely prevent static electricity damage. In particular, it could not be used for sheet materials such as photographic materials that are susceptible to static electricity.

[Problem that the invention seeks to solve]

Another preferred method for completely preventing static electricity generated by contact and peeling is to coat the surface of the cotton knitted gold passrow 2 with a coating. By using a pass roller whose surface is coated with a cotton knitted fabric, it is possible to significantly suppress charging even during high-speed conveyance. However, when transporting a sheet-like material with countless extremely thin short fibers fluffed up on the surface of cotton knitted fabrics, a problem occurs in that the thin short fibers are peeled off and adhered to the surface of the sheet-like material. It's easy to do. In particular, when transporting a sheet for photographic light-sensitive materials, thin short fibers that adhere to the surface of the sheet can cause defects in images, which can be a fatal hindrance.

Furthermore, cotton knitted fabrics have the disadvantage of being unable to be used continuously for long periods of time due to their low strength, and requiring periodic replacement within a short period of time.

On the other hand, fibers other than wires, such as nylon, polyester, polyvinylidene chloride, and bis-thread rayon, have no fluff on their surfaces and have high surface strength, but on the other hand, they have the effect of preventing charging that occurs due to contact and separation between the strip and the pass roller surface. There is a drawback that the initial goal cannot be achieved, that is, the initial target is small.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new roller for conveying a sheet-like object, which does not involve the above-mentioned disadvantages and can reliably prevent the occurrence of charging due to contact with and peeling off the sheet-like object to be conveyed. shall be.

[Means for solving problems]

The above-mentioned object of the present invention is to transport a material whose contact surface with a sheet-like object carries a p-positive charge due to frictional electrification with the sheet-like object and a material which carries a negative charge during the conveyance of the sheet-like object. This is achieved by means of rollers for conveying sheet-like objects which are arranged alternately in different directions.

In the present invention, a material that is charged with a positive charge due to frictional charging with a sheet-like object means a material that is charged with a positive charge, focusing on the electrification series of the sheet-like object, and a material that is charged with a negative charge is means something that is negatively charged, considering the charging series of a sheet-like material.

For example, when the sheet-like material is a photographic light-sensitive material, positively charged series materials such as Teflon (registered trademark), vinyl chloride, nylon, Delrin (registered trademark), styrene, ceramics, and wood can be used as positive charge materials. be.

Examples of negatively charged materials include negatively charged materials such as stainless steel, aluminum, titanium, copper, iron, and tin.

Next, one embodiment of the present invention will be described based on the accompanying drawings.

In FIG. 1, the roller l for conveying a sheet-like object according to the present invention has a contact surface with a sheet-like object 2 to be conveyed. The materials shown by the arrows are alternately combined in the conveying direction of the sheet-like material.

To manufacture such a sheet-like material conveying roller l, first prepare a material 3 using a material reference material, excavate grooves parallel to the longitudinal direction on the companion pass roller, and cut the material 3 into the shape shown in Fig. 2. After being alternately inserted into these grooves and fixed with adhesive, the retaining rings 6 are fitted onto the shaft portions j at both ends and fixed. .

The interval between the alternating combinations of the material 3, which is positively charged due to frictional electrification with the conveyed sheet-like object λ, and the material Hiroshi, which is negatively charged, is determined by the material of the conveyed sheet-like object λ, the material 3, and the material, This will vary depending on the conveyance speed of the sheet-like object, and will be determined empirically. At a speed of 40 m 1 minute, the interval rf
i. At a transport speed of 200 m/min, the interval con is appropriate.

In the present invention, the dimensions such as the outer diameter and length of the sheet conveying roller can be selected from a wide range. Also, in Figure 7,
The contact surface between the sheet-like material 2 and the conveyance roller l is one side,
Although the entire widthwise surface of the sheet material is the contact surface, the contact surface may be both surfaces or a portion of the widthwise direction, for example, both sides, to have an antistatic effect.

In the present invention, the support material for the sheet to be conveyed includes paper, plastic film, resin coated paper,
Includes synthetic paper, etc. Examples of the material of the plastic film include polyolefins such as polyethylene and polypropylene, vinyl polymers such as polyvinyl acetate, polyvinyl chloride, and polystyrene, polyamides such as t,6-nylon, and t-nylon, polyethylene terephthalate, polyethylene-2, Polyesters such as A-naphthalate, polycarbonates, cellulose acetates such as cellulose triacetate, cellulose diacetate, etc. are used. The resin used for the secondary resin coachitic paper is typically polyolefin such as polyethylene, but is not necessarily limited thereto.

[Effect]

When a sheet-like object is conveyed by the sheet-like object conveying roller of the present invention, the polarity of the charging that occurs when the sheet-like object and the surface of the conveying roller are brought into contact and peeled off alternates.
This effectively cancels out the occurrence of static electricity damage.

〔Example〕

In Figures 1 to 3, tear 0/(
registered trademark name), stainless steel (5O8-J
OII) λ transport rollers l with an alternating combination interval Its, an outer diameter jjm, and an effective length≠00tm using t are manufactured and then.

As a result, when a 93,344 m long VOZ Tsuru paper (surface resistance is LogSR value, -14 to 10, -15) was sandwiched between both sides and transported at Ao7Fl for 1 minute, only stainless steel (SUS-Jo4c) was used. Compared to the case where 22 manufactured rows of the same size are transported in the same way, the amount of charge is //
4 and Natsuji.

〔effect〕

If a sheet-like object is conveyed using the roller of the present invention, it becomes possible to suppress the occurrence of charging to a low level even during high-speed conveyance and when the surface resistance of the non-conveyed object is large, and static electricity damage is drastically reduced.

Furthermore, the durability of the equipment is improved, and maintenance work such as cleaning can be simplified.

The present invention is not limited to the embodiments and examples, but has a wide scope.
- A wide range of applications are possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a perspective view of its parts, and FIG. 3 is an enlarged side view of the roller of the present invention shown in FIG. l...Roller roller for transporting sheet-like materials...
...Sheet-like material! ......Shaft part B......Retaining ring

Claims (1)

[Claims] A sheet whose surface in contact with a sheet-like object to be conveyed is made of a material that is positively charged due to frictional electrification with the sheet-like object and a material that is negatively charged, which are alternately combined in the conveying direction of the sheet-like object. Roller for conveying objects.