JPH0110769Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape player, and more particularly to a pinch roller support device that can adjust the angle of the tape feeding direction.

Generally, a tape player is equipped with a capstan shaft 1 and a pinch roller 2 in order to feed the tape at a constant speed. The capstan shaft 1 is disposed near the magnetic head and is driven by a motor to rotate at a constant speed. The shaft 3 of the pinch roller 2 is supported by a bracket 4, and the bracket 4 is rotatably attached to a support shaft 5 provided on the base. During recording and reproducing operations, the pinch roller 2 is
is brought into pressure contact with the capstan shaft 1, and the magnetic tape T held between them is fed out.

In this tape feeding mechanism, if the axis 3 of the pinch roller 2 and the capstan axis 1 are completely parallel (state a in Figure 1), the tape T will be fed in the direction perpendicular to the capstan axis 1 (direction d). However,
When the shaft 3 falls to the state b or c, the line of contact between the pinch roller 2 and the capstan shaft 1 is tilted, and the feeding direction of the tape T is shifted to the e direction or the f direction. In actual equipment, there is a high possibility that the parallelism between the shaft 3 and the capstan shaft 1 will deviate due to the perpendicularity of the capstan shaft 1 and the support shaft 5 with respect to the base, the molding error of the bracket 4, and the like. Therefore, in the manufacturing process of the tape player, the azimuth of the magnetic head is adjusted so that the gap surface of the magnetic head is in optimal contact with the tape T being transferred.

However, in the case of a cassette mechanism with an auto-reverse function, it is equipped with a capstan shaft and a pinch roller for the play direction and reverse direction, respectively, so that the running characteristics of the tape in the play direction (e, f in Figure 1) The running characteristics of the tape in the direction (running angle) and reverse direction are different. Therefore, even if the azimuth of the magnetic head is adjusted when running in the play direction, an appropriate reproduction output may not be obtained when the tape is run in the reverse direction. Therefore, in conventional head adjustment work, an adjustment point is set between the peak point of the playback output when the tape is running in the play direction and the peak point of the playback output when the tape is running in the reverse direction. Therefore, the adjustment work is complicated, and the characteristics of the magnetic head cannot be fully utilized.

The present invention solves the above-mentioned drawbacks of the conventional tape, and allows the tape feeding angle to be adjusted using the capstan shaft and pinch roller, thereby making it possible to efficiently adjust the azimuth of the head in auto-reverse type cassette mechanisms, etc. An object of the present invention is to provide a pinch roller support device for a tape player.

The pinch roller support device according to the present invention consists of a holding member that holds the pinch roller and a supporting member that is supported by a support shaft on a base.The holding member and the support member are connected by a fulcrum shaft, and the holding member supports The pinch roller shaft is supported relative to the member so as to be rotatable in a direction in which the pinch roller shaft is tilted about the fulcrum shaft, and an adjustment bushing is rotatably supported on the support member, and the pinch roller is eccentrically provided on the adjustment bushing. A pin is inserted into the holding member so that the amount of inclination of the holding member can be adjusted by rotating an adjustment bushing.Furthermore, a fixing member is provided for fixing the supporting member and the holding member to prevent the holding member from falling. Furthermore, after the adjustment of the amount of inclination of the shaft of the pinch roller is completed, the holding member and the supporting member can be fixed by the fixing member.

Embodiments of the present invention will be described below with reference to FIG. 2 and the following drawings.

FIG. 2 is an exploded perspective view of the pinch roller support device according to the present invention, FIG. 3 is a plan view of the pinch roller support device, and FIG. 4 is a front view thereof.

The reference numeral 11 in the figure is a pinch roller, and the shaft 12
Fixed. This shaft 12 is rotatably supported within a pair of holes 13a and 13b provided in a holding member 13. The holding member 13 is formed of sheet metal, and a side surface 13c thereof is provided with an elongated hole 13d, a female threaded hole 13e, and a fulcrum shaft 13f. This fulcrum shaft 13f is
It is formed by caulking and fixing a pin-like member to the side surface 13c, or by forming the side surface 13c into a convex shape by pressing. Reference numeral 14 is a support member. This support member 14 is made of sheet metal, and support pieces 14a, 14 are bent into a U-shape.
Support holes 14c and 14d are formed in b. On the other hand, a support shaft 16 is provided near the capstan shaft on the base 15 of the tape player (see FIG. 4). Support hole 1 of the support member 14
4c and 14d are rotatably attached to this support shaft 16. Also, the side surface 14e of the support member 14
Has a round hole 14f, a long hole 14g, and a small hole 14h.
is formed. An adjustment bush 17 is rotatably held within the round hole 14f. An eccentric pin 17a is integrally formed on one surface of the adjustment bush 17, and an operating groove 17 is formed on the other surface.
b is formed.

As shown in the assembled state in FIGS. 3 and 4, the shaft 12 of the pinch roller 11 is inserted into the hole 13 of the holding member 13.
It is rotatably held at a and 13b. Further, the side surface 13c of the holding member 13 is the same as the side surface 13c of the supporting member 14.
4e, and the fulcrum shaft 13f is in contact with the inside of the support member 1.
4 is inserted into the small hole 14h. Further, a fixing screw 18 is inserted into the elongated hole 14g of the support member 14, and its tip is screwed into the female screw hole 13e of the holding member 13, so that the support member 14 and the holding member 13 can be fixed to each other. There is. Furthermore, the adjustment bush 17 is rotatably held in the round hole 14f of the support member 14, and the eccentric pin 17a is
3 is inserted into the elongated hole 13d. Further, a ring or the like is fixed to the tip of the eccentric pin 17a from inside the holding member 13 to prevent the adjustment bush 17 from coming off. Then, the support hole 1 of the support member 14 in which the pinch roller 11 and the holding member 13 are assembled.
4c and 14d are rotatably attached to the support shaft 16 on the base 15.

Further, a spring (not shown) is applied to this pinch roller support device, so that the pinch roller 11 comes into pressure contact with the capstan shaft during recording and playback operations.

Next, the operation and effects of the present invention with the above configuration will be explained.

In the state shown in FIG. 4, the eccentric pin 17a of the adjustment bush 17 is located on the center line a. At this time, the holding member 13 is not inclined with respect to the supporting member 14, and the shaft 12 of the pinch roller 11 is
are almost parallel to each other. Loosen the fixing screw 18,
When the adjustment button 17 is turned counterclockwise,
The eccentric pin 17a pushes the elongated hole 13d downward, the holding member 13 is tilted in the b direction, and the shaft 12 of the pinch roller 11 is also tilted in the b direction. Conversely, when the adjusting bushing 17 is rotated clockwise from the state shown in FIG.
tilt in the direction When the fixing screw 18 is tightened while the holding member 13 is tilted at a certain angle, the holding member 1
3 and the support member 14 are fixed to each other.

As explained in FIG. 1, the pinch roller 11
When the shaft 12 of is tilted in the b direction, the running direction of the tape T is tilted in the e direction, and when the shaft 12 is tilted in the c direction,
The running direction of the tape T is tilted in the f direction. Therefore, by rotating the adjustment bushing 17 and tilting the shaft 12 in the b direction or the c direction, the azimuth adjustment to align the tape T with the track inclination of the magnetic head can be performed while the magnetic head is fixed. In addition, adjustment of the installation slope of the magnetic head,
If the degree of inclination of the shaft 12 is adjusted at the same time, the above azimuth adjustment can be made more effectively.

In addition, the cassette mechanism is equipped with an auto-reverse function, which allows the tape to run in the playing direction.
Separate pinch roller 1 for running in reverse direction
1. If both or one of them is provided with the adjustment function according to the present invention, it becomes possible to efficiently adjust the azimuth when the tape runs in both the playing direction and the reverse direction.

For example, when the tape is traveling in the play direction, adjustment is made by adjusting the mounting inclination of the magnetic head so that the playback output from the head reaches its peak point. On the other hand, to adjust the tape when running in the reverse direction, leave the magnetic head as it is and adjust the inclination of the shaft in the b direction and c direction with respect to the reverse pinch roller to adjust the tape running angle when running in the reverse direction. Make sure to match the gap of the magnetic head. Thereby, the reproduction output when traveling in the reverse direction can be set to the peak point. Note that when the tape runs in the play direction, a pinch roller for play running is used, and a pinch roller for reverse moves away from the capstan shaft.
Therefore, when the tape runs in the play direction, the reproduction output is maintained at an appropriate value by adjusting the attachment of the magnetic head.

In the illustrated embodiment, the adjustment bushing 17 is used as an adjustment mechanism for tilting the holding member 13; however, in other embodiments, a male thread extending parallel to the shaft 12 may be used instead of the adjustment bushing 17. By providing a female thread that is screwed into this, attaching one to the support member 14 and the other to the holding member 13, and rotating the male thread, the holding member 13 is
It is also possible to make it tilt in the c direction.

As described above, according to the present invention, by tilting the holding member with respect to the supporting member, the axis of the pinch roller can be tilted and the feeding angle of the tape by the capstan axis can be changed. Tilt adjustment allows you to adjust the azimuth while keeping the head fixed. Furthermore, by simultaneously adjusting the inclination of the axis of the pinch roller and the inclination of the head, the reproduction output can be adjusted more quickly and reliably. Furthermore, in an auto-reverse type cassette mechanism, if the support device of the present invention is applied to one or both of the pair of pinch rollers for play and reverse, the azimuth adjustment for both the tape play and reverse feed directions can be made accurately. It becomes like this. In particular, in this invention, the inclination of the pinch roller shaft is adjusted by tilting the holding member, so if the holding member is made longer than the shaft, the adjustment range can be widened and the adjustment precision can be increased. can.

Furthermore, by rotating the adjustment bushing provided on the support member, the pin provided on the adjustment bushing tilts the holding member, making it possible to adjust the amount of inclination of the shaft of the pinch roller. This eccentric adjustment mechanism allows fine adjustments to be made.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the tape being fed out by the pinch roller and the capstan shaft, Fig. 2 is an exploded perspective view of the pinch roller support device according to the present invention, and Fig. 3 is a plan view showing the pinch roller support device in the assembled state. FIG. 4 is a front view thereof. DESCRIPTION OF SYMBOLS 11... Pinch roller, 12... Shaft, 13... Holding member, 13f... Fulcrum shaft, 14... Supporting member, 15... Base, 16... Support shaft, 18... Fixing screw.

Claims (1)

[Scope of utility model registration request] A tape player that is equipped with a capstan shaft that rotates on a base and a pinch roller that is in pressure contact with the capstan shaft, and in which the tape is held between the capstan shaft and the pinch roller and fed at a constant speed, and a holder that holds the shaft of the pinch roller. member, and a support member rotatably supported by a support shaft on a base, the holding member and the support member are connected by a fulcrum shaft, and the holding member holds the fulcrum shaft with respect to the support member. The axis of the pinch roller is supported so as to be rotatable in the direction in which it falls down as the center, and an adjustment bushing is rotatably supported on the support member, and a pin eccentrically provided on the adjustment bushing is attached to the holding member. Once inserted, the amount of fall of the holding member can be adjusted by rotating the adjustment bushing.
A pinch roller support device for a tape player, further comprising a fixing member for fixing the support member and the holding member.