JPS626604Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape running adjusting device for a magnetic recording/reproducing device, and more particularly to a magnetic tape running adjusting device that can accurately determine the running position of a magnetic tape relative to a pinch roller.

Magnetic recording and reproducing devices, such as tape recorders and video tape recorders, have a configuration in which a magnetic tape is sandwiched between a pinch roller and a capstan, and the magnetic tape is driven by the capstan. It has a guide so that the tape can come into contact with the pinch roller at a predetermined position, and this guide can be adjusted as desired, so that the running position of the magnetic tape with respect to the pinch roller can be adjusted.

That is, in the conventional magnetic tape running adjustment device shown in FIGS. 1 and 2, a frame-shaped pinch arm 1 is attached to a chassis, etc. A tape guide 3 is attached to the support shaft 2 which is attached to the support shaft 2, and this tape guide 3 is constantly pushed by a pressure spring 4 wound around the support shaft 2 so that it can move along the support shaft. A male threaded portion 5a of an adjusting screw 5 screwed in from one side is threaded into a female threaded portion 3a of the tape guide 3. Further, a pinch roller 6 is attached to the pinch arm 1 at a position adjacent to the tape guide 6 via a rotating shaft 6a, and the tape guide 3 is moved to the support shaft 2 by screwing the adjustment screw 5. It is designed to be able to move along the magnetic tape, and the contact position of the magnetic tape with the pinch roller, the so-called running position, can be adjusted.

In this way, the conventional magnetic tape running adjustment device
Since there is a gap between the support shaft installed in the pinch arm 1 and the hole through which it is inserted, the tape guide 3 may wobble, and the tape guide 3 may be moved by the adjuster screw 5, which may prevent the pinch from occurring. It was difficult to maintain parallelism to the rollers, and the distance to the pinch rollers varied depending on the adjustment position.

Therefore, this idea aims to make it possible to accurately adjust the position of the tape guide relative to the pinch roller without being affected by manufacturing errors or mechanically unavoidable errors. Instead of screwing the screw together, the tape guide is pressed against the adjustment screw by the end of the screw, and a compression spring wrapped around the support shaft is pulled by the tension spring, causing a part of the tape guide to become pinched. It is characterized by a structure that allows it to hit the arm and maintain a predetermined posture.

Next, an embodiment of the structure of this invention shown in FIG. 3 of the attached drawings and subsequent drawings will be described. First, the third
In the figures below, reference numeral 11 indicates a pinch arm attached to a chassis, etc., and this pinch arm 11 is formed by mutually parallel plane plates 11a and a side plate 11b connecting one end edge of these plane plates 11a. The tape guide 13 is supported by a support shaft 12 whose ends are supported by both plane plates 11a.
is supported so that it can rotate. A guide groove 13a is formed at the edge of this tape guide 13, and the tape guide 13 is wound around the support shaft 12 from the bottom side in FIG. 4 and pushed up by a push spring 12a. Adjustment screw 14 is screwed onto flat plate 11a so as not to move along the plane.
The end portion 14a is holding down the tape guide 13,
The position of the tape guide 13 can be selected by adjusting the screwing amount of the adjustment screw 14.

Furthermore, a stopper 13b that corresponds to the side plate 11b is formed at the end of the tape guide 13 near the side plate 11b, and the tape guide 13, which is rotated around a support shaft 12 by a tension spring 15 to be described later, is supported by the stopper 13b. Maintaining posture with restrictions.
The tension spring 15 has one end hooked to a hook 13c formed on the tape guide 13, and the other end hooked to a hook 11c formed on the side plate 11b of the pinch arm 11, so that the tension spring 15 is attached to the tape guide 13 on the spindle 12.
It gives a torque centered around .

A pinch roller 16 is located adjacent to the tape guide 13, and a rotary shaft 16a that rotatably supports the pinch roller 16 is supported at both ends by the flat plate 11a of the pinch arm 11, respectively.

In addition, as shown in Fig. 5, the adjustment screw 1
The end portion 14a of the tape guide 13 is not directly applied to the tape guide 13, but is screwed into the pressing member 17 having a female threaded portion 17a, and the pressing member 17 is pressed by the pressing spring 18 interposed between the pressing member 17 and the flat plate 11a. Alternatively, the tape guide 13 may be pushed by a protrusion 17b formed on the pressing member 17.

As mentioned above, the tape guide 13 is pressed by the push spring 12a wound around the support shaft 12, and furthermore,
Torque is applied by the tension spring 15 with the support shaft 12 as the center of rotation, and the stopper 1 of the tape guide 13
3b is in contact with the side plate 11b of the pinch arm 11, so the looseness between the support shaft 12 and the tape guide 13 is eliminated because the tape guide 13 is elastically pushed (pulled) in one direction. and
Furthermore, since the adjustment screw 14 is not directly screwed into the tape guide, looseness due to screw connection is also eliminated.

Therefore, by screwing in the adjustment screw 14, the tape guide 13 is moved in parallel along the support shaft 12, thereby adjusting its position with respect to the pin roller 16.

As is clear from the above description, the magnetic tape adjusting device for a magnetic recording/reproducing device of this invention has a tape guide attached to the pinch arm via a spindle, and the tape guide is attached using at least two springs. The end of the adjustment screw screwed into the pinch arm is biased in one direction along mutually perpendicular planes, and the end of the adjustment screw is directly or indirectly applied to the tape guide to prevent the tape guide from moving along the support shaft. This structure eliminates the looseness between the tape guide and the spindle that supports it, as well as the looseness caused by the adjustment screw. By adjusting the adjustment screw, the tape guide can be moved parallel to the support, making it possible to accurately position it relative to the pinch roller. You can choose to.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side view of a conventional magnetic tape running adjusting device, FIG. 3 is a plan view of a magnetic tape running adjusting device according to this invention, and FIG. 4 is a side view taken in the direction of the arrow in FIG. 3. , FIG. 5 is a side view corresponding to FIG. 4 according to another embodiment. 11... Pinch arm, 12... Support shaft, 12a
... Pressure spring, 13 ... Tape guide, 14 ... Adjustment screw, 15 ... Tension spring, 16 ... Pinch roller.

Claims (1)

[Scope of utility model registration request] In a magnetic tape running adjustment device for a magnetic recording/reproducing device that includes a tape guide and a pinch roller on a pinch arm, the guide is supported by being penetrated by a spindle installed in the pinch arm, and the guide is pushed and pinched. an adjustment screw threaded onto the arm, the guide being pushed toward the adjustment screw by a spring wrapped around the support and pulled by a tension spring so that the end of the guide abuts the pinch arm. 1. A magnetic tape running adjustment device for a magnetic recording/reproducing device, characterized in that the tape position is finely adjusted by moving a guide along a spindle.