JPS6034126Y2 - Pinch roller lever pivot mechanism for magnetic recording tape traveling device - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the first
a second substrate provided on the substrate and movable between a first position near the capstan and a second position farther from the capstan than the first position; and a pinch roller rotatable. a pinch roller lever pivot mechanism that pivots a held pinch roller lever to the second substrate and rotates the pinch roller lever in a state where a center line of the pinch roller is parallel to a center line of the capstan; a biasing body provided on the roller lever and biasing the pinch roller lever in a direction in which the pinch roller approaches the capstan; and a biasing body when the second substrate is placed in the second position. The pinch roller lever is held against the biasing force of the pinch roller, and the pinch roller is separated from the capstan. When the second substrate is placed in the first position, the holding is released and the pinch roller is moved. The present invention relates to a pinch roller lever pivot mechanism for a magnetic recording tape running device, including a pinch roller lever holding member that presses the capstan with the biasing force of the biasing body.

A conventional pinch roller lever pivot mechanism is formed of a central shaft fixed to a second board in parallel with the capstan, and a single plate-shaped member, and is provided at one location between the central shaft and the plate-shaped member. It consists of a pinch roller lever that is rotatably held by a bearing.

The conventional pinch roller lever pivot mechanism with such a configuration has only one bearing portion for rotatably holding the pinch roller lever formed of a plate-shaped member on the central axis.
However, since the length of the bearing part along the center line had to be relatively short, if a relatively large external stress is applied to the pinch roller lever or pinch roller for some reason, the bearing part The disadvantage is that excessive force is applied to the bearing, which tends to lose the precision of the bearing.

If the precision of the bearing part goes out of order, the parallelism of the outer peripheral surface of the pinch roller to the capstan axis will go out of order, causing damage to the magnetic recording tape such as one-sided stretching, and making it impossible to run the magnetic recording tape at a constant speed. This may cause wow or flutter.

This idea was made based on the above circumstances, and is a pinch roller lever pivot for a magnetic recording tape running device that has a simple structure that can maintain good accuracy of the bearing without applying excessive force to the bearing. It is to provide a supporting mechanism.

An embodiment of this invention will be described below with reference to the drawings.

A magnetic recording tape running device according to an embodiment of this invention includes:
As shown in FIG. 1, a first substrate 12 is fixed to a housing (not shown) and has a capstan 10 rotatably provided thereon.
It is equipped with

Above the upper surface of the first substrate 12, a second substrate 14 formed of a plate material having an arcuate planar shape is arranged.

The second substrate 14 extends along the upper surface of the first substrate 12 and has a central side surface facing the outer circumferential surface of the capstan 10, and a shaft 16 provided at one end of the second substrate It is supported by 12.

The second substrate 14 is rotated in one direction and the other direction about the shaft 16, thereby moving the second substrate 14 to a first position near the capstan 10 and a position further away from the capstan 10 than the first position as shown in FIG. It is movable between the second position and the second position.

A pinch roller lever 18 is disposed between the upper surface of the first substrate 12 and the lower surface of the second substrate 14, and is formed of a plate material having a band-shaped planar shape.

The pinch roller lever 18 moves along the upper surface of the first substrate 12 and the lower surface of the second substrate 14 to move the arcuate second substrate 14 along the upper surface of the first substrate 12 and the lower surface of the second substrate 14
The pinch roller lever extends like a string, and is pivoted to the second base plate 14 near the shaft 16 by a pinch roller lever pivot mechanism 2o provided at one end thereof.

At the center of the pinch roller lever 18, there is a pinch roller 2.
2 is rotatably provided, and the center line of rotation of the pinch roller 22 is parallel to the center line of the capstan 10.

As shown in FIG. 1, the pinch roller lever pivot mechanism 20 includes a bearing portion 24 disposed near the shaft 16 of the second substrate 14.
It is equipped with

The bearing portion 24 is integrally fixed to the second substrate 14 and has a center line parallel to the capstan 10.

Further, as shown in FIGS. 1 and 2, the pinch roller lever pivot mechanism 20 is fixed to one end of the pinch roller lever 18 by being integrally molded with this one end.
a first tongue portion 26 extending above the base plate 14 and adjacent to and facing the upper end surface of the bearing portion 24;
A second tongue portion 28 is provided at one end portion of the bearing portion 8 , which is integrally molded with the one end portion and fixed thereto, extends downward from the second substrate 14 , and adjoins and faces the lower end surface of the bearing portion 24 . ing.

A center shaft 30 is rotatably inserted into the bearing portion 24, that is, supported.

The upper end of the central shaft 30 is fitted into a hole formed in the first tongue portion 26 and held, and the lower end of the central shaft 30 is fitted into a hole formed in the second tongue portion 2B. combined and maintained.

A biasing body 32 made of a torsion coil spring is wound around the outer peripheral surface of the bearing portion 24, as shown in particular detail in FIG.

As shown in detail in FIG. 1, the upper end of the biasing body 32 is hooked to a portion 34 of the first tongue portion 26 extending upward from the lower surface of the second substrate 14. Further, the lower end of the biasing body 32 is attached to a locking pin 36 fixed to the upper surface of the second board 14.
In addition, it is hooked to the biasing body 32 so that a biasing force is stored therein.

The pinch roller lever 18 is urged by the urging force of the urging body 32 so that the pinch roller 22 rotates in a direction closer to the capstan 10.

A pinch roller lever holder is provided on the second substrate 14 and extends along the upper surface of the pinch roller lever 18 in a direction approaching the capstan 10, and the extending end thereof is disposed within the rotation locus of the pinch roller lever 18. A member 38 is provided.

When the second board 14 is placed in the second position as shown in FIG. The pinch roller lever 18 is held against the biasing force of the biasing body 32.

At this time, the pinch roller 22 is separated from the capstan 10.

When the second substrate 14 is placed in a first position (not shown), the pinch roller 22 is in contact with the capstan 10, and the extending end of the pinch roller lever holding member 38 is in contact with the capstan of the pinch roller lever 18. The pinch roller lever 18 is disposed at a position closer to the capstan 10 than the opposite side, and releases the holding of the pinch roller lever 18.

Therefore, the pinch roller 22 is pressed against the capstan 10 by the urging force of the urging member 32.

The capstan 10 is connected to a flywheel 40 below the first substrate 12, and the flywheel 40 is connected to an electric motor (not shown) by a belt 42.

The capstan 10 is rotated at a constant speed and in a constant direction by the electric motor (not shown).

A magnetic head 44 is provided at the other end of the second substrate 14 .

When the second substrate 14 is placed in the first position, the magnetic head 44 comes into contact with a magnetic recording tape (not shown) which is held between the capstan 10 and the pinch roller 22 and is fed in a certain direction at a certain speed. It functions to record information on a magnetic recording tape (not shown) or to extract information from the magnetic recording tape (not shown).

As described in detail above, the pinch roller pivot mechanism of the magnetic recording tape running device of this invention is fixed to the second substrate and whose center line is parallel to the capstan, and to the pinch roller lever. a first tongue portion extending above the second substrate and adjacent to and facing the upper end surface of the bearing portion; Since the structure includes a second tongue portion facing the lower end surface of the bearing portion, and a central shaft supported by the bearing portion and held by the first and second tongue portions, The length in the direction along the center line of the bearing part is the first
It can be set between the second tongue part and the second tongue part, and can be made longer than the conventional one.

In addition to this, the center shaft supported by the bearing is held at two locations by the first and second tongues fixed to the pinch roller lever, so for some reason the center shaft is relatively large. Even if external stress is applied to the pinch roller or the pinch roller lever, the external stress is dispersed between the first and second tongue portions and the bearing portion, and an excessive force is not applied to the bearing portion as in the conventional case.

Therefore, not only can the precision of the bearing portion be maintained well, but also the configuration can be simplified.

Further, in this invention, since the pinch roller lever is provided with the first and second tongue portions, the pinch roller lever is connected to a transmission mechanism for transmitting the movement of the pinch roller lever to other constituent members (not shown). The degree of freedom can be increased.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a pinch roller lever pivot mechanism of a magnetic recording tape traveling device according to an embodiment of the invention;
The figure is a schematic sectional view taken along the line ■-■ in FIG. DESCRIPTION OF SYMBOLS 10...Capstan, 12...First board, 14...Second board, 18...Pinch roller lever, 20...Zench roller Lever pivot mechanism, 22...Zench roller, 24...
・Bearing part, 26...First tongue piece part, 28...
...Second tongue piece portion, 30...Central axis, 32.
...Biasing body, 38...Zench roller lever holding member.

Claims (1)

[Scope of utility model registration request] A capstan is provided on a first base plate rotatably provided and is movable between a first position near the capstan and a second position farther from the capstan than the first position. A pinch roller lever rotatably holding a pinch roller and a second substrate is pivoted to the second substrate, and the pinch roller lever is rotated with the center line of the pinch roller parallel to the center line of the capstan. a pinch roller lever pivot mechanism, and a biasing body provided on the pinch roller lever to bias the pinch roller lever in a direction in which the pinch roller approaches the capstan;
When the second substrate is placed in the second position, the pinch roller lever is held against the biasing force of the biasing body, and the pinch roller is separated from the capstan, so that the second substrate A magnetic recording tape running device comprising: a pinch roller lever holding member that releases the holding when placed in the first position to press the pinch roller against the capstan by the urging force of the urging member; The pinch roller lever pivot mechanism includes a bearing fixed to the second board and having a center line parallel to the capstan, and a bearing part fixed to the pinch roller lever and extending above the second board. a first tongue portion adjacent to and facing the upper end surface of the bearing portion; and a first tongue portion fixed to the pinch roller lever and extending below the second substrate and adjacent to and facing the lower end surface of the bearing portion. A pinch roller lever pivot support for a magnetic recording tape running device, characterized in that the pinch roller lever pivot support for a magnetic recording tape running device is characterized in that the central shaft is rotatably supported by the bearing portion and held by the first and second tongue portions. mechanism.