JPH0224860A - Tape driving device - Google Patents

Abstract

PURPOSE:To obtain a small-sized tape driving device with a less number of parts by constituting a pinch roller in such a way that the roller can be erected gradually from a lying state by means of a guide as the roller is brought nearer to a capstan when a tape is drawn out. CONSTITUTION:A magnetic tape 5 is drawn out to a capstan shaft 1 by means of a drawing out post 4. Then a turning arm 7 is turned around its 1st shaft 6 by means of a driving arm 13 through a 1st spring 8 so that the arm 7 can be brought nearer to the shaft 1. Then a pinch roller 3 is guided to a guide 12 which becomes higher as the arm 7 is turned while a 2nd shaft 11 energized by the 2nd spring 9 is abutted with the guide 12. When the arm 7 is turned until a position where the roller 3 becomes almost parallel to the shaft 1, the upper end section of the shaft 11 is engaged with a guide groove 15 provided on the bearing body 10 of the shaft 1 integrally and the roller 3 is abutted with the shaft 1. By further driving the arm 13 in the direction shown by the arrow A thereafter, the roller 3 is stably pushed by the capstan shaft 1 when a gap delta is formed between the abutting sections of the arms 13 and 7. Therefore, this tape driving device can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape drive device in a magnetic recording/reproducing apparatus using a magnetic tape as a recording medium.

2. Description of the Related Art A conventional video tape recorder using a tape cassette is disclosed in Japanese Patent Publication No. 59-27983, in which a capstan shaft 20 is inserted into an opening of a tape cassette 21 as shown in FIG. It has a structure like this,
The tape cassette 21 and the capstan flywheel 22 overlap in the height direction of the device. In FIG. 3, 23 is a substrate, 24, 215, 26, 27 are tape drawer posts, 28 is a supply reel stand, 29 is a take-up reel stand, and 30 is a tensilon regulating post.

31 is an erase head, 32 is an audio control head, 33 is a pinch roller, 134 is a magnetic tape, 3
5 is a rotating head drum. However, with such a structure, there is a limit in making the magnetic recording/reproducing device thinner because the cabstance srywheel 22 and tape cassette 21 overlap in the height direction of the device. Therefore, the capstan shaft 20 is positioned outside the tape cassette 21 as shown in FIG.
．． A configuration has been proposed in which the magnetic tape is pulled out to a predetermined tape running path in contact with the capstan shaft 20 by means of 25, 26, 27 and 36. However, in this method, after the magnetic tape is pulled out, it is necessary to insert the pinch roller 33 inside the pulled out tape path. The method of inserting the pinch roller 33 is as described in Japanese Unexamined Patent Publication No. 61-165853, in which the pinch roller, which has been previously positioned above the magnetic tape, is lowered into the tape path, and then A configuration in which it is pressed against the capstan shaft 20 has been considered.

Problems to be Solved by the Invention However, in the above configuration, the pinch roller is located above when the magnetic tape is pulled out, so it is not suitable for making the entire device thinner, and the pinch roller is located above the capstan. In order to press the shaft with high precision, the device does not have to be large in size, but requires a large number of parts and is complex. The present invention provides a tape drive device that has a small number of parts and can be downsized.

Means for Solving the Problems In the tape drive device of the present invention, a shaft that rotatably holds a pinch roller is rotatably supported by a rotation arm, and as the rotation arm rotates, the shaft rotates. Resisting the applied elastic biasing force, the pinch roller t along with the shaft is moved by the guide whose height changes sequentially.When the pinch roller is pressed against the capstan shaft, by means of a stop proximately engaging said shaft;
It is constructed to ensure the parallelism of the pinch roller to the capstan axis.

Effects According to the above configuration, the pinch roller, which is lying on its side when the tape is pulled out, is sequentially raised up by the guide as it approaches the capstan, so a compact tape drive device can be realized with a small number of parts. It is.

Embodiment FIG. 1 is a perspective view showing an embodiment of the tape drive device of the present invention, and FIGS. 2(A) and 2(B) are front views in different states. 2 shows a state in which the magnetic tape 5 is operatively attached to the substrate, and (b) shows a state in which the magnetic tape 5 is driven. In FIGS. The capstan shaft 7 is arranged on the substrate and is provided outside the tape cassette 2. The capstan shaft 7 rotates about a first shaft 6 on a plane perpendicular to the capstan shaft 1. A second shaft 11 is provided at the distal end of the arm so as to be rotatable only in a direction perpendicular to the direction of rotation.

A pinch roller 3 is rotatably held on this second shaft 11. 13 is an arrow.

This is a drive arm that is reversibly driven in the B direction by a drive source such as a plunger, and has a long hole 13 &
A bottle 7a planted on the other end of the rotating arm 7 is slidably inserted, and a first spring is inserted between the bottle 7a and a bottle 13b planted on the drive arm 13. It is multiplied by 8.

In other words, as the drive arm 13 moves in the direction indicated by the arrow, the single rotation arm 7 rotates from the first position shown in FIGS. 1 and 2 (A) to the second position close to the capstan shaft 1. is configured to operate.

Reference numeral 12 denotes a guide provided between the first position and the second position so that the height of the guide increases from the first position to the second position.

The second shaft 11 is elastically biased by a second spring 9 so as to come into contact with this guide.

Next, this operation will be explained. In the state shown in FIGS. 1 and 2 (()), the magnetic tape 6 is removed from the cassette 2.
is pulled out to the capstan shaft 1 using the pull-out post 4. After that, the pivot arm 7 is rotated around the first shaft 6.
by the drive arm 13 so as to approach the capstan shaft 1 with the drive arm 13 in the center.

It is rotated via the first spring 8. At that time.

The pinch roller 3 is guided by the second shaft 11, which is elastically biased by the second spring 9, coming into contact with the guide guide 12 whose height gradually increases as the pinch roller 3 rotates;
The upper end of the second shaft 11 is moved relative to the rotation arm 7 while changing its inclination sequentially, and when the pinch roller 3 is rotated to a point where it is approximately parallel to the capstan shaft 1, the upper end of the second shaft 11 The pinch roller 3 is engaged with a guide groove 16 provided integrally with the bearing body 1o of the capstan shaft 1, and the pinch roller 3 is brought into contact with the capstan shaft 1 (the second
(See figure (b)). Thereafter, the drive arm 13 is further driven in the direction of the arrow.

When a gap δ is formed between the driving arm 13 and the rotating arm 7, the pinch roller 3.

The capstan shaft 1 is stably pressed by the elastic force of the first spring 8.

Here, the parallelism of the pinch roller 3 with respect to the capstan shaft 1 is considered separately in the direction of rotation of the rotation arm 7 and the direction perpendicular thereto. Due to the perpendicularity of the supporting shaft to the rotating arm 7 and the perpendicularity to the rotating shaft 60 substrate, the latter is as shown in FIG.
In order to ensure tape drive, the rotating arm 70 has an angular deviation θ with respect to the direction of the reaction force R against the force of the pinch roller 3 pressing against the capstan shaft 1. The second shaft 11 comes into contact with only one of the side walls 101L and 10b of the guide groove 16 due to the reaction force R, and the position of the second shaft 11 is restricted from that K. The distance 11 from the center of rotation to the center of the pinch roller 3, the distance 12 from the center of rotation of the rotating arm 7 to the side wall 10a of the guide groove 15, and the radius r of the second shaft 11. and the distance E from the center of rotation of the second shaft 11 to the point of engagement with the guide groove 16.
3. For example, 11- (j!2+r)
Even if is 0.20 due to precision variations in parts,
If there are 25 fl of 13, its parallelism is -1α2 sin (-) = 0.458 (dog) Tealka et al., sono parallelism is 11.12. r, its dimensions are easy to secure, and the long distance E5 can be easily guaranteed.

Further, as mentioned above, when the magnetic tape is pulled out, the pinch roller 3 is placed horizontally.

It can be configured in a small amount of space.

Effects of the Invention As described above, according to the present invention, even when the capstan shaft is disposed outside the tape cassette.

The central axis of rotation of the pinch roller is made rotatable, and as the rotating arm rotates, the pinch roller operates while its inclination is regulated by the guide, and when pressing, the central axis of rotation of the pinch roller is moved near the capstan axis. With the configuration in which the retainer stopper means is provided, the accuracy of the parallelism of the pinch roller to the capstan axis can be easily ensured, while using less space, making it possible to downsize the device, and requiring only a small number of parts. Therefore, it can be constructed at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the tape drive device of the present invention, FIGS. 2A and 2B are front views showing different states of the same embodiment, and FIGS. 3 and 4 are FIG. 1 is a front view of a conventional tape drive device. 1... Capstan shaft, 2... Tape cassette. 3... Pinch roller, 4... Tape drawer post. 5...Magnetic tape, 6. River...first axis, 7.
...Rotating arm, 8...First spring, 9
...Second spring. 1o...Bearing body, 11...Second shaft,
12... Guide guide, 13... Drive arm, 7a... Bin. 13! L...Elongated hole, 20...Capstan shaft, 21...Tape cassette, 22...
...capstan flywheel, 23...substrate, 24, 25, 26. 27.36...Tape drawer post, 28...
...Supply reel stand, 2g...Take-up reel stand, 3o...Tension regulator post,
31... Erase head, 32... Audio control head, 33... Pinch roller, 34... Magnetic tape, 36...
・Rotating head drum. Name of agent: Patent attorney Shigetaka Awano and 1 other person/-
11th Ipstan shaft 3-pinch roller γ-rotating arm A 9--1 2nd 1 Yen U--1 2nd sleeve

Claims (1)

[Claims] A capstan shaft and a distal end portion thereof supported for reversible rotation between a first position close to the capstan shaft and a second position separated from the capstan shaft on a plane perpendicular to the capstan shaft. a rotary arm, and a tip of the rotary arm,
A shaft supported so as to be rotatable only in a direction perpendicular to the direction of movement of the tip thereof, and a pinch roller rotatable around the shaft; the first position and the second position so that the height is increased.
a guide provided between the guide and the guide; and an elastic biasing means for biasing the shaft so as to contact the guide.
engaged with the shaft in the vicinity of the capstan shaft;
A tape drive device comprising stopper means for regulating the position of the capstan shaft so that the shaft thereof is parallel to the capstan shaft.