JPH0528587Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a reel drive device for a slide loading type recording/reproducing machine that loads a magnetic tape by sliding a magnetic tape cassette in the forward direction on each reel stand. Regarding.

[Summary of the idea]

A swinging element for transmitting driving force is fixedly arranged between a pair of reel drive shafts, and at the front and rear ends of the linear movement of the reel drive shafts for tape loading, one of the swinging elements is fixedly arranged in the middle of the pair of reel drive shafts. It is made to be able to engage with the reel drive shaft, thereby making the span of the transmission path from the power source to the swinging element constant without being affected by displacement of the reel drive shaft.

[Conventional technology]

A slide loading type recording/reproducing machine is known in which tape loading is performed by sliding a magnetic tape cassette mounted on a reel stand toward the front (tape exposed surface) for each reel stand. Among such recording and reproducing machines, those that do not have a dedicated reel motor obtain reel driving force from a capstan motor, for example.
Performs tape winding, fast forwarding, rewinding, etc. during recording and playback.

FIG. 6 is a schematic plan view showing a conventional reel drive system, in which a supply reel stand 1 (hereinafter referred to as an S reel stand) and a take-up reel stand 2 (hereinafter referred to as a T reel stand) are
It is provided on a slide chassis and is slidable in the direction of arrow A. It can be selectively engaged with the drive gear of either the S reel stand 1 or the T reel stand 2. An oscillating gear 3 is provided on a rotating arm 4 rotatably attached to the slide chassis, and this oscillating gear 3 includes a drive gear 5 coaxial with the rotating arm 4, a belt 6, an intermediate pulley 7,
It is sequentially coupled to a drive source motor 9 (for example, a capstan motor) via a belt 8 . Depending on the rotation direction of the motor 9 corresponding to the mode of the recorder/player,
Swing gear 3 is S reel stand 1 or T reel stand 2
It is engaged with either one of the two.

[Problem that the invention attempts to solve]

Since the motor 9 and the intermediate pulley 7 are fixed to the frame side, the axis of the rotating arm 4 should follow a circular arc movement trajectory as shown by arrow B, but in reality, the moving frame moves in a straight line in the direction of arrow A. Because of the movement, the belt 6 must expand and contract. For this reason, the tension of the belt 6 tends to change over time, and slippage is also likely to occur.

[Means for solving problems]

As shown in FIG. 1, the reel drive device of the present invention moves a tape cassette 10 between a pair of reel stands 1 and 2
After mounting the cassette on the reel drive shafts 11 and 12 on the reel stand, the cassette is moved by a predetermined amount toward the front of the cassette with respect to the stationary chassis together with the reel stand, and the rotating head drum 1 is moved.
A magnetic recording or reproducing apparatus adapted to perform tape loading for a drive force transmitting device having a swing axis 31 provided on the stationary chassis 22 at an intermediate portion between the pair of reel drive shafts 11 and 12. A reel that is provided on a slide chassis 14 having an oscillating element (oscillating gear 34) and the reel stands 1 and 2, and includes the oscillating element (oscillating gear 34) and the pair of reel drive shafts 11 and 12. A regulating hole 43 is provided for regulating the amount of swing of the swinging element so that the distance between the swinging element and each driving element becomes approximately an appropriate value during loading.

At each of the forward end and backward end positions of the cassette 10, the swing element (swing gear 34) rotates the pair of reel drive shafts 11,
12 to transmit reel driving force to the reel driving shafts 11 and 12.

[Effect]

Even if the reel drive shafts 11 and 12 are displaced relative to the swinging element 34 as the tape cassette moves forward or backward, the swinging axis 31 of the swinging element 34 is on the fixed side, so that the swinging axis is not connected to the fixed side power source. The span of the power transmission path to the swinging element 34 remains substantially unchanged. Further, as the reel drive shafts 11 and 12 move, the amount of swing of the swing element (swing gear 34) is regulated by the regulation hole 43, and the swing element (swing gear 34) and the reel drive shaft 11 are regulated by the regulation hole 43. , 12 is maintained properly.

〔Example〕

FIG. 1 is a plan view of the main parts of a video tape recorder to which the present invention is applied, showing the state before tape loading, and FIG. 2 is a plan view of the main parts in a state where loading is completed.

When the tape cassette 10 is installed at the position indicated by the two-dot chain line in Fig. 1, the reel drive shafts 11 and 12 are inserted into the pair of reel holes on the bottom of the cassette, and the positioning pins 13 (a pair) are inserted into the reference holes of the cassette. Ru. A supply reel stand 1 (S reel stand) and a take-up reel stand 2 (T
The reel stand) and the positioning pin 13 are provided on a slide chassis 14, and upon completion of mounting the cassette, the slide chassis 14 is slid to the position shown in FIG. The sliding support of the slide chassis 14 is provided by four pairs of guide pins 15 (fixed side) and a long hole 1.
4a (slide chassis side).

Also, in conjunction with this sliding movement, the magnetic tape 16 on the front of the cassette is moved to the guide pin 1 as shown in Figure 2.
7a and 17b, and is wound around the circumferential surface of the rotary head drum 18. Also, the pinch roller 19 is connected to the capstan 2 with the magnetic tape 16 in between.
Pressed to 0.

The capstan 20 is directly connected to a capstan motor 23 attached to the back surface of the main frame 22. The driving force of the capstan motor 23 is transmitted to the oscillating gear set 27 via gears 24, 25 and a timing belt 26, and is then selectively transmitted to the drive gear 28 of the S reel stand 1 or the drive gear 29 of the T reel stand 2. Reportedly. The oscillating gear set 27 is fixed on the main frame 22, and as the slide chassis 14 moves, the drive gears 28 and 29 of both reel stands 1 and 2 move relative to each other. Therefore, the span of the timing belt 26 is a fixed value.

As shown in the detailed cross section of FIG. 3, the oscillating gear set 27 includes a fixed gear 32 that rotates around a fixed pivot 31, an oscillating plate 33 that pivots around the pivot 31, and a rotating end of the oscillating plate 33. The oscillating gear 3 is attached to the oscillating gear 3 and meshes with the fixed gear 31.
It is equipped with 4.

The oscillating gear 34 is located above the slide chassis 14, and the fixed gear 32 that meshes with the oscillating gear 34 is
A shaft portion 32 that passes through an opening 35 formed in the slide chassis 14 and extends toward the main frame 22 side.
It is equipped with a. This shaft portion 32a further passes through a hole 36 in the main frame 22, and is attached to a pulley 32b formed at the tip of the shaft portion 32a.
is hung. The pivot 31 is supported by a pedestal 38 via a bush 37, and this pedestal 38 is fixed on the main frame 22.

The oscillation gear 34 is rotatably attached to a support shaft 39 implanted at the free end of the oscillation plate 33, and is closely attached to the oscillation plate 33 by a spring 40 via a friction piece 41. Therefore, a frictional force is generated between the oscillating gear 34 and the oscillating plate 33, and this causes the oscillating plate 33 to move in accordance with the rotational direction of the motor 23.
is urged to rotate clockwise or counterclockwise as shown in FIGS. 1 and 2.

The shaft 39 of the oscillating gear 34 extends upward and projects through the regulation hole 43 of the regulation plate 42 . The regulating plate 42 moves together with the slide chassis 14, and also has the role of covering the structures below the S reel stand 1 and the T reel stand 2 (indicated by a dashed line in Figs. 1 and 2). show). The regulation hole 43 determines the swing limits (left end and right end) of the swing gear 34. (a) Adjust the axial center distance between the swing gear 34 and the drive gears 28 and 29 of the S and T reel stands to an appropriate value. (equivalent to a pitch circle), and (b) the swing gear 34 and the drive gears 28, 29.
It has two functions: to create a state in which it does not mesh with either of the two.

The oscillating gear set 27 is arranged on a vertical line passing through the midpoint of a straight line connecting the axes of the S and T reel stands 1 and 2, and is shown before loading as shown in Fig. 1 and after loading as shown in Fig. 2. , swing gear 3
The support shaft 39 of 2 is equidistant (symmetrical) to the above straight line.
Located in

Next, the operation of the oscillating gear 32 in relation to the operating mode of the video tape recorder will be explained with reference to the detailed views of main parts in FIGS. 4 and 5.

FIG. 5 shows the state before loading corresponding to FIG.
It is located at the upper end of the . A side edge 43T of this regulation hole 43 on the T reel stand 2 side (right side) has a radius R
(The sum of the respective pitch radiuses of the driving gear 29 and the oscillating gear 32 of the T-reel stand 2). On the other hand, the side edge 43S of the lower half of the regulation hole 43 on the S reel stand 1 side (left side) also has a radius R.
It forms an arc. In addition, the side edge 43F of the upper half is
Continuing from the side edge 43S through the step 43a, with a radius R
It is a straight part that is sufficiently larger than the extension line of the T-reel stand and protrudes toward the T-reel stand side.

As shown in FIG. 1, when the slide chassis 14 starts moving forward for loading with the tape cassette 10 installed at the reference position, the capstan motor 23 is rotated in the opposite direction, and the swing plate 33 is rotated counterclockwise. , the support shaft 39 of the oscillating gear 34 moves toward the left edge 43F of the regulation hole 43 as shown in FIG.
biased toward In this state, the oscillating gear 34 does not mesh with any of the drive gears 28 and 29 of the S reel stand 1 and the T reel stand 2, and becomes free, as shown by the dashed line.

When M loading of the magnetic tape 16 is performed as described above as the slide chassis 14 moves forward, the S reel stand 1 is braked, so the tape 16 wound around the rotary head drum 18 is freely wound. It is unwound from the take-up reel on the side of the T-reel stand 2. Note that since the capstan motor 23 is stopped during the forward movement of the slide chassis 14, the oscillating gear 34 is
is not biased into meshing with the drive gear 28 of.

As shown in FIG. 2, when tape loading is completed at the forward end of the slide chassis 14, the support shaft 39 is located at the lower end side of the regulation hole 43 as shown in FIG. It becomes possible to mesh with either one of the drive gears 28 and 29 on the T side. When the capstan motor 23 rotates forward during recording (or reproduction), the oscillation plate 33 is biased clockwise, and the support shaft 39 of the oscillation gear 34 is biased toward the right edge 43T of the regulation hole 43. Therefore, the oscillating gear 34 meshes with the drive gear 29 of the T-reel stand 2, and the tape 16 is wound onto the take-up reel.

When the capstan motor 23 is reversed in the reverse mode, the oscillation plate 33 is urged counterclockwise, and the support shaft 39 of the oscillation gear 34 is biased toward the left side edge 43S of the regulation hole 43. Therefore, the oscillating gear 34 meshes with the drive gear 28 of the S reel stand 1,
Tape 16 is rewound onto the supply reel. Reverse mode occurs temporarily when recording continuously.

Next, in the unloading mode, the motor 23
is rotated in the normal direction, and the support shaft 39 of the oscillating gear 34 is biased toward the right edge 43T of the regulation hole 43. Therefore, the oscillating gear 34 is the driving gear 29 of the T-reel stand 2.
As the slide chassis 14 retreats, the tape 16 is unwound from the rotary head drum 18 while being wound on the take-up reel, returning to the state shown in FIG. 1 and M loading is released. During this time, the support shaft 39 of the oscillating gear 34 continues to be biased along the arc of the side edge 43T, so the oscillating gear 34 and the T reel stand 2 continue to be biased along the arc of the side edge 43T.
The state of engagement with the drive gear 29 is maintained.

In the embodiment, the oscillating gear 34 is used, but a oscillating idler may also be used. Also, the swing gear set 2 is connected to the motor 23 as the power source.
7, a gear set can be used instead of the timing belt 26.

[Effects of the invention] As described above, the present invention prevents the span of the transmission path from the power source to the oscillating element from changing during linear reciprocating movement of the reel drive shaft for tape loading. Since the swing amount is controlled by the regulation hole 43 as the reel drive shaft moves so that the engagement between the element and the reel drive element is maintained properly, the power transmission member can be expanded and contracted. A high-performance, low-cost reel drive device can be obtained with a simple configuration.

[Brief explanation of drawings]

The drawings show an embodiment of a video tape recorder to which the present invention is applied. Fig. 1 is a plan view of the main part before tape loading, Fig. 2 is a plan view of the main part after loading is completed, and Fig. 3 is a plan view of the main part of the oscillating gear set. 4 and 5 are detailed views of the swinging motion, and FIG. 6 is a schematic view of a conventional reel drive mechanism. In addition, in the symbols used in the drawings, 1... supply reel stand (S reel stand), 2... take-up reel stand (T
reel stand), 10... tape cassette, 11, 1
2... Reel drive shaft, 14... Slide chassis, 16... Magnetic tape, 18... Rotating head drum, 22... Main frame, 23... Capstan motor, 27... Oscillating gear set, 2
8, 29... Drive gear, 31... Pivot, 32...
...Fixed gear, 33... Swing plate, 34... Swing gear, 42... Regulation plate, 43... Regulation hole.

Claims (1)

[Scope of Claim for Utility Model Registration] After the tape cassette is mounted on the reel drive shafts on the pair of reel stands, the cassette is moved a predetermined amount in the front direction of the cassette with respect to the stationary chassis together with the reel stands to release the tape against the rotating head drum. In a magnetic recording or reproducing device configured to perform loading, a swinging element for transmitting driving force having a swinging axis provided on the stationary chassis at an intermediate portion of the pair of reel drive shafts, and the reel stand. , and the swing amount of the swing element is set such that the distance between the swing element and the reel drive element including the pair of reel drive shafts is approximately an appropriate value during loading. At each of the forward end and backward end positions of the cassette, the swing element engages with one of the reel drive elements including the pair of reel drive shafts depending on the swing direction. A reel driving device characterized in that the reel driving force is transmitted to the reel driving shaft at the same time.