JPH04259945A - Guide roller - Google Patents

Abstract

PURPOSE:To prevent worn particles from being generated due to wearing between the members of an upper flange and a sleeve and to prevent the worn particles or dust such as cut particles or the like from falling down to a roller main body side and entering a space between the sliding faces of the sleeve and the roller main body. CONSTITUTION:The guide roller is constituted so as to adjust the position of a roller main body (12) on a supporting shaft (2) according to the movement of a sleeve (10) corresponding to the screwing of an upper flange (30), and by fixing an annular body (resin cap 24) composed of synthetic resin to the apex of the sleeve, the annular body is interposed between the upper flange and the sleeve so as to avoid direct friction between the upper flange and the sleeve.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to guide rollers used for transporting magnetic tapes in magnetic recording devices and playback devices such as video tape recorders, video cameras, and DATs.

0002

2. Description of the Related Art Conventionally, in video tape recorders, video cameras, DATs, etc., pivot type guide rollers have been used to transport magnetic tapes. This guide roller, for example, elastically supports a lower flange and a metal sleeve on a support shaft via a coiled spring, and then attaches the roller body to the outside of the sleeve, and then attaches it to the top of the support shaft. It has a structure in which a nut-shaped upper flange is attached to cover the threaded part on the side. In such a guide roller, by screwing the upper flange, the span between the upper and lower flanges is set, and the position of the sleeve on the support shaft moves according to the screwing amount of the upper flange, and the roller body The position can be adjusted and set as desired.

0003

By the way, in this guide roller, since the upper flange and the sleeve, which are both made of metal, are in contact with each other, it is difficult to rotate the upper flange when assembling the guide roller or adjusting the position of the roller body. , Chips formed and remaining on the threaded part of the support shaft during cutting move from the threaded part, and abrasion powder is generated due to friction between the upper flange and the sleeve, and the chips and abrasion powder are If it gets between the sliding surfaces of the sleeve and the roller body or adheres to the circumferential surface of the roller body, problems such as deterioration of the performance of the guide roller will occur. If dust such as chips or abrasion powder gets into the space between the sliding surface of the sleeve and the roller body, it will cause uneven rotation of the roller body, jitter defects, and roller squeal. If it adheres to the circumferential surface, it will be necessary to remove it, and if it is left unattended, there is a risk that the running of the magnetic tape to be guided may be hindered.

Therefore, the present invention prevents the generation of abrasion powder due to friction between the members of the upper flange and the sleeve, and also prevents the abrasion powder and dust such as chips from falling to the roller body side and causing the roller body and sleeve to contact each other. The purpose of the present invention is to realize a guide roller that prevents the guide roller from entering between the sliding surfaces.

[0005]

[Means for Solving the Problems] That is, the guide roller of the present invention has a sleeve (2) formed of metal on the support shaft (2).
10) and a lower flange (16) are elastically supported by a spring (14), and a roller body (12) is rotatably placed on the outside of the sleeve and formed at the end of the support shaft. An upper flange (30) made of metal is attached to the threaded portion (34), and the position of the roller main body on the support shaft can be adjusted by movement of the sleeve in response to screwing of the upper flange. It is characterized in that an annular body (resin cap 24) made of synthetic resin is fixed to the top of the sleeve and interposed between the upper flange and the sleeve.

[0006]

In the guide roller of the present invention, since the annular body fixed to the top of the sleeve is interposed between the upper flange and the sleeve, the upper flange and the sleeve are separated by this annular body. Therefore, the upper flange and sleeve do not come into direct contact, so even if the upper flange is screwed in,
This prevents the generation of abrasion powder due to wear, and also prevents chips from the threaded part from falling onto the roller body, preventing them from entering between the sliding surfaces of the roller body and sleeve. It is possible to avoid the influence of

[0007]

Embodiment FIGS. 1A and 1B and FIG. 2 show an embodiment of the guide roller of the present invention. This guide roller is provided with a support shaft 2 having a cylindrical shape at the center of rotation, and this support shaft 2 has a stepped portion 4 in the middle, a large diameter portion 6 on the lower side, and a small diameter portion on the upper side. 8 is formed. On the side of the small diameter portion 8, there is provided a sleeve 10 made of metal as well as an elastic support means for elastically supporting the roller body 12 made of synthetic resin or non-magnetized metal. A coil-shaped spring 14 having the same diameter and a larger inner diameter than the small diameter portion 8 is fitted into the spring 14.
A sleeve 10 is attached to the upper side of the sleeve 10 via a lower flange 16 formed of metal.

The lower flange 16 has a cylindrical protrusion 18 into which the spring 14 is inserted and supports the sleeve 10, and has an annular flange portion 20 formed at its lower end. A through hole 22 slightly larger than the small diameter portion 8 of the support shaft 2 is formed in the center of the cylindrical protrusion 18 .

The sleeve 10 is a flat cylindrical body made of metal such as brass or stainless steel, and serves as a substantial bearing for the cylindrical roller body 12 to be installed on the outer peripheral surface of the sleeve 10. A resin cap 24 is integrally formed on the top side of the sleeve 10 as an annular body made of synthetic resin.

As shown in FIG. 1B, the resin cap 24 is formed to be slightly smaller than the inner diameter of the large diameter portion 26 formed on the roller body 12 in order to avoid contact with the roller body 12. At the same time, it is formed at the top of the sleeve 10 by, for example, insert molding of synthetic resin, and a through hole 28 through which the support shaft 2 passes is formed in the center thereof. Further, the upper surface of the resin cap 24 is formed into a flat surface in order to make smooth contact with the upper flange 30.

A roller body 12 is rotatably attached to the outer peripheral surface of the sleeve 10. The roller body 12 is formed into a cylindrical shape of synthetic resin or metal that does not cause magnetic influence in order to avoid magnetic influence on the magnetic tape to be guided, and a large diameter portion 32 is formed on the end surface of the roller body 12. The inner diameter of the large diameter portion 32 is formed larger than the outer diameter of the cylindrical protrusion 18 of the lower flange 16, and the cylindrical protrusion 18 is inserted into the inner diameter of the large diameter portion 32 to prevent contact between the roller body 12 and the lower flange 16. is planned.

Further, a nut-shaped upper flange 30 is attached to a threaded portion 34 formed at the top of the support shaft 2.
An adjustment groove 36 for inserting an adjustment driver is formed in the upper surface of the upper flange 30. Therefore, between the upper flange 30 and the sleeve 10, a resin cap 24 fixed to the sleeve 10 is placed between the roller body 10 and the sleeve 10.
2 and are sandwiched in a non-contact state.

According to this configuration, as shown in FIG. 2, the spring 14 is attached to the support shaft 2, and then the lower flange 16 and the sleeve 10 are fitted, and then the sleeve 1
0, and the upper flange 30 is attached to the threaded portion 34 of the support shaft 2. Then, rotate the upper flange 30 and attach the sleeve 10 to the spring 1.
4, the roller body 12 can be adjusted and set at a desired position.

When the upper flange 30 is rotated when assembling the guide roller and setting the position of the roller body 12 as described above, the upper flange 30 also moves onto the flange-shaped resin cap 24 which is integrally fixed to the sleeve 10. The upper flange 30 and the sleeve 10 do not come into direct contact with each other. Therefore, the two do not come into contact and wear out, and generation of abrasion powder as in the conventional case can be reliably prevented.

Furthermore, the upper flange 30 and the resin cap 24
Even if there is friction, the resin cap is sticky, so
Powder-like dust is not generated due to wear, and the influence of metal powder and dust can be reliably avoided, thereby increasing the reliability of the guide roller and reliably preventing the occurrence of uneven rotation as in the past. Further, the resin cap 24 is attached to the sleeve 10.
Since it is formed with a larger diameter, the gap between the sleeve 10 and the roller body 12 is covered with the resin cap 24, and chips generated during cutting of the threaded portion 34 are prevented from falling to the end surface side of the roller body 12. Intrusion into the sliding surface between the roller body 12 and the sleeve 10 is prevented.

[0016]

As explained above, according to the present invention, since the annular body made of synthetic resin is fixed to the top of the sleeve and the annular body is interposed between the upper flange and the sleeve, the upper flange It is possible to avoid direct metal-to-metal contact between the roller body and the sleeve, reliably prevent the generation of abrasion powder due to the rotation of the upper flange, and prevent dust from forming on the end surface of the roller body, such as chips generated during cutting of the threaded part. It can reliably prevent uneven rotation of the roller body, poor jitter, occurrence of roller squeal, and influence on the magnetic tape, etc. that should be guided, due to intrusion of dust, and can improve running performance. can. In addition, since the annular body made of synthetic resin is fixed to the sleeve, no special process or treatment is required when assembling the guide roller, making it extremely easy to create a highly reliable guide roller. .

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the guide roller of the present invention;
A) is a longitudinal cross-sectional view of the guide roller, and (B) is a partial cross-sectional view of the guide roller.

FIG. 2 is a partially exploded sectional view of the upper flange side of the guide roller shown in FIG. 1;

[Explanation of symbols]

2 Support shaft 10 Sleeve 12 Roller body 14 Spring 16 Lower flange 24 Resin cap (annular body) 30 Upper flange 34 Threaded part

Claims (1)

[Claims] Claim 1: A sleeve and a lower flange formed of metal are elastically supported on a support shaft by a spring, and a roller body is rotatably placed on the outside of the sleeve, and the roller body is rotatably mounted on an end of the support shaft. An upper flange made of metal is attached to the formed threaded portion, and the position of the roller main body on the support shaft can be adjusted by movement of the sleeve in response to screwing of the upper flange,
A guide roller characterized in that an annular body made of synthetic resin is fixed to the top of the sleeve and interposed between the upper flange and the sleeve.