JPH04276346A - Impedance roller device - Google Patents

Abstract

PURPOSE:To suppress backlash in the thrust direction of an impedance roller used for stabilizing tape traveling in a magnetic recording and reproducing device and to eliminate any displacement in the axial direction due to its posture. CONSTITUTION:An impedance roller main body 14 is supported by a pivot bearing structure, and the other side of the bearing part of this impedance roller main body is pressed by an other press retaining member 15 having elasticity.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impedance roller device used to stabilize tape running in a magnetic recording/reproducing device such as a video tape recorder.

0002

2. Description of the Related Art FIGS. 3 and 4 show sectional views of a conventional example.

The impedance roller mechanism shown in FIG. 3 has a structure in which an impedance roller 2 is received at one point at the tip of a support shaft 1 having a spherical tip, and the impedance roller mechanism shown in FIG.
A sliding member 4, an impedance roller 5, and a sliding member 6 are inserted into the shaft 3 implanted in the support shaft 3a, and a retaining ring 7 is fitted into a groove provided in the support shaft 3a to prevent the impedance roller 5 from falling off. has been completed. In the impedance roller mechanism constructed in this manner, the magnetic tape comes into contact with the outer periphery of the impedance rollers 2 and 5, and the rollers rotate according to the feed speed thereof.

0004

[Problems to be Solved by the Invention] In the impedance roller mechanism shown in FIG. 4, the weight of the impedance roller 5 is applied to the sliding member 4, which is subjected to frictional resistance, causing uneven rotation, and the purpose of stabilizing the running of the tape is not sufficiently achieved. In the impedance roller mechanism shown in Fig. 3, which was proposed as an improvement, when used in multiple orientations,
Depending on the posture, the pivot receiver part of the impedance roller 2 may become separated, making it impossible to obtain the effect of the pivot receiver, resulting in uneven rotation.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention supports an impedance roller main body by a pivot bearing structure, and the opposite side of the impedance roller main body to the bearing part is supported by another elastic pressing member. I'm holding it down.

[0006]

[Operation] In the impedance roller device of the present invention, the magnetic tape in contact with the impedance roller rotates without resistance depending on the feeding speed, and it is held in place by elastic force from both sides in any posture. , there is no vertical deviation with respect to the feeding direction of the abutting tape, which eliminates rotational unevenness, and stable tape running can be obtained.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an impedance roller device according to the present invention, and FIG. 2 is a plan view of a tape running system of a video tape recorder according to the present invention.

In the figure, 8 is a take-up reel, 9 is a supply reel, 10 is a drum, 11 is a magnetic tape, 12 is a guide roller, 13 is an inclined pole, 14 is an impedance roller body, and 15 is a pressing member.

The impedance roller main body 14 is a cylindrical body having a flange on the upper side, and a recess 14a is formed in the center of the upper surface of the flange.

The holding member 15 has a hard spherical protrusion 15a at the tip of an elastic plate, and is attached to an earth angle 16 for the drum 10.

The impedance roller main body 14 is fitted into a pivot shaft 17 having a spherical tip implanted in a chassis (not shown), is supported at one point at the tip of the pivot shaft 17, and is rotatable. be. Further, a projection 15a of the pressing member 15 is fitted into the recess 14a of the impedance roller main body 14, and one point of the tip of the projection 15a is in contact with the recess 14a.

That is, the impedance roller main body 14 is
It is held between one point on the tip of the pivot shaft 17 and one point on the tip of the protrusion 15a of the holding member 15, and vertical movement is restricted by the elasticity of the holding member 15.

As described above, the impedance roller device described above has a pivot bearing structure in both the upper and lower directions of the impedance roller body 14, and the impedance roller body 14 rotates smoothly without going against the force that tries to rotate it. do.

[0015]

According to the present invention, thrust backlash occurring in the axial direction of the impedance roller is suppressed by the elasticity of the holding member, thereby eliminating axial displacement due to posture and forming a pivot receiving structure in both the vertical and vertical directions. This allows the tape to rotate smoothly without going against the external force applied by the tape, allowing stable running of the tape.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an impedance roller device of the present invention.

FIG. 2 is a plan view of the tape running system of the video tape recorder according to the present invention.

FIG. 3 is a sectional view of a conventional impedance roller device.

FIG. 4 is a sectional view of a conventional impedance roller device.

[Explanation of symbols]

14 Impedance roller body 15 Holding member 17 Pivot axis

Claims (1)

[Claims] 1. An impedance roller device characterized in that an impedance roller body is supported by a pivot bearing structure, and the side of the impedance roller body opposite to the bearing portion is pressed by another elastic presser member.