JP2002326748A - Tape guiding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape guiding device capable of always eliminating the static electricity generated between a tape-form supporting body and a guide roller effectively and preventing surely cockles and damages from generating on the tape-form supporting body caused by static electricity. SOLUTION: This tape guiding device 20 is to guide the running tape-form supporting body 22 and is provided with a fixed shaft 24 which is held at a ground potential, the guide roller 26 supported on the fixed shaft 24 rotatably, and a disk 28, which is fixed to the fixed shaft 24 intersected orthogonally and fixed to the fixed shaft 24 and conducted to the fixed shaft 24. The tape guiding device 20 is also provided with a contact brush 30, one end section of which is connected to the disk 28 electrically and the other end section of which is formed as a free end which contact the guide roller 26 slidably and electrically to conduct the guide roller 26 to the disk 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape guide device for guiding a running tape-shaped support, and more particularly, to electrically guide a guide roller to a fixed shaft when the tape-shaped support is guided. The present invention relates to a tape guide device that can be operated.

[0002]

2. Description of the Related Art In general, a magnetic tape such as an audio tape or a video tape is formed on a long non-magnetic tape-like support (hereinafter, also referred to as a support) such as a polyester film by using a ferromagnetic powder or a binder. A magnetic layer is formed by applying a magnetic paint in which a splitting agent, a lubricant and the like are dispersed and kneaded in an organic solvent. A coating system for applying a magnetic coating material on a tape-shaped support and drying to form a magnetic layer is provided with a traveling system for continuously running the tape-shaped support via an application step, a drying step, and the like. Has been established. The running system includes a supply roller (unwinding roller) for supplying the tape-shaped support, a driving roller for running the tape-shaped support, a plurality of guide rollers for guiding the tape-shaped support to an appropriate position, and And a winding roller for winding the tape-shaped support.

In such a coating apparatus, it is important to maintain the running of the tape-shaped support stably and not to affect the shape quality and the film formation state in order to perform the film formation satisfactorily. . Factors that make the running of the tape-shaped support unstable may include running resistance caused by surface contact between the tape-shaped support and the guide roller, an air film generated by rotation of the guide roller, and the like. Further, as factors that impair the shape quality, wrinkles (linkels) due to static electricity generated in the guide roller and the like can be considered together with the above-mentioned unstable factors.

Here, a conventional tape guide device provided with a guide roller will be described with reference to FIG. FIG. 8 is a cross-sectional view showing a main part of the conventional tape guide device 10. As shown in FIG. The tape guide device 10 includes a fixed shaft 12 fixed to the device main body.
And a guide roller 16 rotatably supported on the fixed shaft 12 via a ball bearing 14, and a disk 18 for regulating the position of the guide roller 16 on the fixed shaft 12.

[0005]

In the conventional tape guide device 10, a guide roller 16 for guiding a tape-shaped support is used.
And the fixed shaft 12 are interposed between the ball bearing 14 and the fixed shaft 12, but the conductivity of the ball bearing 14 is hindered by the oil film, and the guide roller 16 and the fixed shaft 12 are in a non-conductive state. . For this reason, if the slip occurs between the support and the guide roller 16 due to a mechanical loss (mechanical loss) of the guide roller 16 as the production speed of the magnetic tape increases, static electricity is generated and the support Is caused to stick to the guide roller 16. If the amount of accumulated static electricity exceeds the limit, the support and the guide roller 16
In some cases, electrostatic discharge (spark) may occur between the two, and in that case, the support may be locally damaged, resulting in a product defect such as disturbed image quality.

As a countermeasure, there is a method of installing a non-contact type static elimination bar made of carbon fiber or the like near the guide roller 16, but this method is unstable because the non-contact type static elimination effect is unstable. Yes, management and maintenance are complicated. Also,
Depending on the mounting position of the guide roller 16, the static elimination bar may not be arranged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to always effectively remove static electricity generated between a tape-like support and a guide roller, and to reduce static electricity caused by static electricity. It is an object of the present invention to provide a tape guide device capable of reliably preventing wrinkles, damage, and the like of the tape-shaped support member from being generated.

[0008]

In order to achieve the above object, a tape guide device according to the present invention comprises: a tape guide device for guiding a traveling tape-like support; A guide roller rotatably supported on the fixed shaft, a disk fixed perpendicular to the fixed shaft, and conducting to the fixed shaft, and one end electrically coupled to the disk,
And a contact brush formed at the other end as a free end electrically slidably in contact with the guide roller and for conducting the guide roller to a disk.

In the tape guide device according to the present invention, the contact brush always slides on the rotating guide roller when the tape-shaped support is guided, so that the guide roller is always electrically connected to the fixed shaft via the contact brush and the disk. Let it. Therefore, as the production speed increases, even if a slip occurs due to mechanical loss or the like between the support and the guide roller, the static electricity generated at that time reliably flows to the fixed shaft held at the ground potential. And the charge is removed. Accordingly, it is possible to prevent a problem that the tape-shaped support is stuck to the guide roller, and to eliminate a defect factor such as wrinkles.

In a preferred tape guide device according to the present invention, the guide roller has a cylindrical surface protruding in a cylindrical shape on the disk side about the fixed shaft, and the disk is provided on the outer peripheral side of the cylindrical surface of the guide roller. Equipped with a cylindrical surface protruding toward the guide roller so as to face the cylindrical surface, the contact brush has one end connected to the cylindrical surface of the disk and the other end slidable on the cylindrical surface of the guide roller. Is in contact with Accordingly, a configuration in which the contact brush on the disk side can always slide and slide on the guide roller can be obtained from a simple configuration. Further, a plurality of contact brushes can be prepared, and each contact brush can be fixed at equal angular intervals (for example, divided by 180 degrees) along the cylindrical surface of the disk. Thereby, the electrical conductivity between the cylindrical surface of the guide roller and the contact brush can be further stabilized.

In a preferred tape guide device of the present invention, the contact brush is connected to the cylindrical surface of the disk and is urged toward the cylindrical surface of the guide roller. And a multi-layered conductive foam fixed to the tip of the. Thereby, since the spring property of the conductive leaf spring and the elasticity of the multilayer conductive foam can be used together, the frictional force comes in contact with the guide roller in an extremely small state,
Rotational unevenness can be eliminated, and good sliding contact sliding that follows disturbance such as vibration can be realized.

Further, the multilayer conductive foam includes a conductive knit, a conductive polyurethane foam and a conductive nonwoven fabric sequentially provided on a conductive leaf spring. The conductive knit includes a conductive adhesive, a conductive double-sided adhesive tape. Or it is preferably fixed to the conductive leaf spring by screws or the like. Thus, a contact brush that achieves good sliding contact with the guide roller can be obtained from a simple configuration.

[0013] The disk of the guide roller device according to the present invention includes:
From the side opposite to the side facing the guide roller, a through-hole can be formed through the engaging screw or the engaging pin toward a position where the contact brush connected to the cylindrical surface of the disk can be engaged. In this case, when assembling the tape guide device,
After the guide roller is rotatably supported on the fixed shaft, an engaging screw or the like is screwed into and penetrated into the through hole of the disk to engage with the contact brush, and the contact brush is raised to the cylindrical surface side of the disk in advance. Can be kept. Then, after inserting the disc through the fixed shaft and fixing it at the position facing the guide roller, if the engaging screw or the like is pulled out, the contact brush is released at this point,
The urging force allows the guide roller to contact the cylindrical surface. Thereby, a series of assembling work becomes extremely easy.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the accompanying drawings based on embodiments. Embodiment 1 This embodiment is an example of an embodiment of a tape guide device 20 according to the present invention, and FIG. 1 is a front view showing the tape guide device 20 according to the present embodiment in partial cross section. 2 is a side view showing a state where the tape-shaped support 22 is wound around the tape guide device.

As shown in FIGS. 1 and 2, a tape guide device 20 guides a running tape-like support member 22. The tape guide device 20 is fixed to a main body of the device and held at a ground potential. 24, a guide roller 26 rotatably supported on the fixed shaft 24, and fixed orthogonal to the fixed shaft 24,
And a disk 28 electrically connected to the fixed shaft 24. The fixed shaft 24 includes a large diameter portion 24a and small diameter portions 24b formed at both ends of the large diameter portion 24a. Furthermore, the tape guide device 20 is formed as a free end, one end of which is electrically coupled to the disk 28 and the other end of which is in electrical slidable contact with the guide roller 26.
6 is provided with a contact brush 30 for conducting 6 to the disk.

The guide roller 26 is formed in a cylindrical shape having circular walls 32 at both ends. At the center of the circular wall portion 32, a through hole 34 that penetrates the fixed shaft 24 is formed. Further, the guide roller 26 is provided with the fixed shaft 24 in the through hole 34.
The outer ring of a ball bearing 36 having an inner ring fitted in the small-diameter portion 24b while the small-diameter portion 24b penetrates through the small-diameter portion 24b is rotatably supported by the fixed shaft 24. On the surface of the guide roller 26 facing the disk 28, a housing portion 38 is formed which is annularly recessed around the fixed shaft 24. A cylindrical surface 40 is formed on the inner peripheral side of the housing portion 38, the cylindrical surface 40 being centered on the fixed shaft 24 and projecting in a cylindrical shape on the disk 28 side in parallel with the fixed shaft 24.

The guide roller 26 has, for example, an axial length ranging from 150 mm to 1200 mm and an outer diameter of 5 mm.
One set in the range of 0 mm to 100 mm can be used. As the fixed shaft 24, a small-diameter portion 24b having an outer diameter set to about 12 mm can be used.

The disk 28 regulates the axial movement of the guide roller 26 at both ends thereof.
2 through the small diameter portion 24b of the fixed shaft 24 in the through hole 42, and is screwed into a fixed screw hole 44 formed in a direction orthogonal to the small diameter portion 24b.
It is fixed to. The disk 28 is in good conduction with the fixed shaft 24 because the inner peripheral surface of the through hole 42 comes into strong contact with the fixed shaft 24 by tightening the fixing screw 46.

The disk 28 has a cylindrical surface 48 projecting toward the guide roller 26 at a position fixed to the fixed shaft 24 so as to face the cylindrical surface 40 on the outer peripheral side of the cylindrical surface 40. One end of the contact brush 30 has a cylindrical surface 4.
8, the free end of the contact brush 30 is slidably in contact with the cylindrical surface 40.

FIG. 3 is a cross-sectional view showing the disk 28 and the guide roller 26 before being assembled to the fixed shaft 24. As shown in FIG. 3, the disk 28 has two through holes 50 formed in parallel with the fixed shaft 24. The through hole 50 is screwed with an engaging screw (or engaging pin) 52 from the side opposite to the side facing the guide roller 26 to a position where the contact brush 30 coupled to the cylindrical surface 48 can be engaged. It is formed so that it can be done.

FIG. 4 is a cross-sectional view showing a state cross-sectional along the line IV-IV in FIG. As shown in FIG.
8, the through-holes 5 are provided at point-symmetric positions with respect to the fixed shaft 24.
0 is formed one by one, and a pair of screw holes 54 for fixing the contact brush 30 with the fixing screws 53 are formed. FIG. 1 shows a state in which one engagement screw 52 has been removed after the tape guide device 20 has been assembled.
When this state is viewed in FIG. 4, the conductive foam 30 b of the contact brush 30 on the side from which the engagement screw 52 has been removed is in contact with the cylindrical outer peripheral surface 40. On the other hand, in the conductive foam 30b on the side from which the engaging screw 52 is not removed, the gap S1 is interposed between the conductive foam 30b and the cylindrical surface 40.

Here, a detailed configuration of the contact brush 30 will be described with reference to FIGS. 5 is a side view of the contact brush 30, FIG. 6 is a front view seen from the free end side, and FIG. 7 is an enlarged side view showing the conductive foam 30b. In FIG. 5, the contact brush 30 in a free state is indicated by a two-dot chain line, and a state in which the contact brush 30 is lifted by the engagement of the engagement screw 52 at the time of assembly is indicated by a solid line.

As shown in FIGS. 5 and 6, the contact brush 3
Reference numeral 0 denotes a leaf spring portion (conductive leaf spring) made of a metal material such as stainless steel having good conductivity and spring properties and urged toward the cylindrical surface 40 of the guide roller 26 when assembling to the tape guide device 20. ) 30a, and a conductive foam 30b fixed to a free end of the leaf spring portion 30a. The leaf spring portion 30a is formed in an arc shape as a whole, but its free end is formed in a flat shape so that the conductive foam 30b can be easily fixed. Leaf spring part 30a
On the base end side opposite to the free end, a pair of through-holes 30c that match the screw holes 54 formed in the cylindrical surface 48 are formed. The contact brush 30 can be used without the conductive foam 30b provided that the leaf spring portion 30a is extremely soft, does not increase the frictional force, and can contact the cylindrical surface 40 softly.

In the present embodiment, as shown in FIG. 7, a conductive foam having a three-layer structure can be used as the conductive foam 30b so that the cylindrical foam 40 can be brought into contact with an optimum pressure. Examples of the conductive foam having a three-layer structure include those manufactured by Seiren Co., Ltd.
That is, a three-layer conductive foam (multilayer conductive foam)
Reference numeral 30b includes a conductive knit 58, a conductive polyurethane foam 56, and a conductive nonwoven fabric 60 sequentially provided on the free end of the leaf spring portion 30a. Conductive knit 58
Is fixed to the leaf spring portion 30a with a conductive adhesive, a conductive double-sided adhesive tape (for example, a double-sided conductive tape manufactured by Sumitomo 3M Limited), a screw, or the like.

In the conductive foam 30b having a three-layer structure, the conductive polyurethane foam 44 is an extremely soft elastic body and the leaf spring portion 30a has a spring property.
The contact brush 30 can always slidably contact the cylindrical surface 48 by soft touch while keeping the frictional force extremely small.
Therefore, the tape-like support 22 is
Even when static electricity is generated, the static electricity can flow from the cylindrical surface 40 to the ground potential via the contact brush 30, the disk 28, and the fixed shaft 24 to effectively remove the static electricity.

Here, the steps in assembling the tape guide device 20 will be described. First, the guide roller 26 is rotatably supported on the fixed shaft 24 by the ball bearing 36. Thereafter, the engaging screw 5 is inserted into the through hole 42 of the disk 28.
2 is screwed and penetrated, and the contact brush 30 is set in a state of being previously lifted to the cylindrical surface 48 side. Further, the through-hole 42 of the disk 28 is inserted through the fixed shaft 24 and fixed at a position facing the guide roller 26, and then the engaging screw 52 is removed. Thereby, the leaf spring portion 30a of the contact brush 30 is released,
The guide roller 26 can be brought into good contact with the cylindrical surface 40.

In FIG. 1, one side of the entire apparatus is cross-sectionally shown to show the configuration according to the present invention in detail. However, the same configuration as that of one side can be applied to the other side. , The other side may be simply configured to restrict the axial movement of the guide roller 26.

In this embodiment, the contact brush 30
Are provided, but the present invention is not limited to this, and one or more than three can be provided. As the number increases, better conductivity is obtained.

[0029]

As described above, according to the tape guide device of the present invention, one end is electrically connected to the disk,
In addition, the other end is formed as a free end that is slidably in electrical contact with the guide roller, and has a contact brush that conducts the guide roller to the disk. Static electricity generated can always be effectively removed, and wrinkles, damages, and the like of the tape-shaped support member caused by the static electricity can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a front view showing a tape guide device according to a first embodiment of the present invention in a partial cross section.

FIG. 2 is a side view showing a state where a tape-shaped support is wound around a tape guide device.

FIG. 3 is a sectional view showing a disk and a guide roller before being assembled to a fixed shaft.

FIG. 4 is a cross-sectional view showing a state cross-sectional along the line IV-IV in FIG. 1;

FIG. 5 is a side view showing the contact brush of the embodiment.

FIG. 6 is a front view of the contact brush viewed from a free end side.

FIG. 7 is an enlarged side view showing a conductive foam.

FIG. 8 is a sectional view showing a main part of a conventional tape guide device.

[Explanation of symbols]

20 tape guide device, 22 tape-shaped support, 2
4 ... fixed shaft, 24a ... large diameter part, 24b ... small diameter part,
26 guide roller, 28 disk, 30 contact brush, 30a leaf spring portion, 30b conductive foam,
30c: through hole, 32: circular wall, 34, 42, 5
0 ... through-hole, 36 ... ball bearing, 38 ... accommodation part, 40, 48 ... cylindrical surface, 44 ... fixed screw hole, 4
6, 53 ... fixing screw, 52 ... engaging screw (or engaging pin), 54 ... screw hole, 56 ... conductive polyurethane foam, 58 ... conductive knit, 60 ... conductive nonwoven fabric.

Claims (5)

[Claims] 1. A tape guide device for guiding a running tape-shaped support, comprising: a fixed shaft held at a ground potential; a guide roller rotatably supported by the fixed shaft; and fixed perpendicular to the fixed shaft. A disk that is electrically connected to the fixed shaft, one end of which is electrically coupled to the disk, and the other end of which is formed as a free end electrically slidably in contact with the guide roller; A tape guide device comprising: a contact brush that conducts to a disk. 2. The guide roller has a cylindrical surface protruding cylindrically on the disk side about a fixed shaft, and the disk guides the outer peripheral side of the cylindrical surface of the guide roller so as to face the cylindrical surface of the guide roller. The contact brush has a cylindrical surface protruding toward the roller, and the contact brush has one end coupled to the cylindrical surface of the disk and the other end slidably contacting the cylindrical surface of the guide roller. The tape guide device according to claim 1. 3. The tape guide device according to claim 2, wherein a plurality of contact brushes are provided, and each of the contact brushes is fixed at equal angular intervals along the cylindrical surface of the disk. 4. The contact brush is coupled to a cylindrical surface of the disk,
The tape guide device according to claim 2, further comprising a conductive leaf spring biased toward a cylindrical surface of the guide roller, and a multilayer conductive foam fixed to a tip of the conductive leaf spring. 5. . 5. The multilayer conductive foam includes a conductive knit, a conductive polyurethane foam, and a conductive nonwoven fabric sequentially provided on a conductive leaf spring, wherein the conductive knit includes a conductive adhesive, a conductive double-sided adhesive tape. The tape guide device according to claim 4, wherein the tape guide device is fixed to the conductive leaf spring by a screw or the like.