JPH0227409Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Technical Field of the Invention The present invention relates to a mechanism for driving a tape reel of a magnetic tape device.

(B) Background of the Technology To record, reproduce, and erase information using a magnetic tape, the above-mentioned device is performed by installing a tape reel on a reel boss and rotating it to feed out the tape. In this case, if the tape reel moves up and down as it rotates, or if the stop position shifts when moving from a running state to a stopped state, it will be difficult to accurately record, playback, or erase information, and it will be difficult to keep the tape reel stable on the reel boss. It is necessary to install it.

(C) Prior Art and Problems Figures 1a and 1b are block diagrams of a conventional tape reel drive mechanism, in which figure a is a top sectional view and figure 1b is a sectional view taken along the breaking line AA'.

Collet C having wedge-shaped engaging portions G ₁ , G ₂ , G ₃
The rotating shaft J' of the motor M is fitted into the lower end of the reel, and the outer circumference thereof is inscribed in the reel boss B'. reel boss
B′ and collet C are connected by screws N ₁ and N ₂ ,
Since the tips of the screws N ₁ and N ₂ press against the outer peripheral surface of the motor's rotating shaft J', the motor's rotating shaft J' and the collect C reel boss B' rotate integrally due to frictional force caused by this pressing.

Shaft F is the rotating shaft of collet C and motor.
The engaging portion G ₁ of the collet C is inserted into the center of the collet C by pulling the shaft F downward.
~Push out G ₃ and reel spline (groove) V ₁ ,
By penetrating and pressing V ₄ and V ₆ , the engagement between the collet C and the tape reel R is strengthened, and the movement of the tape reel R during rotation is suppressed.

Note that the shaft F is driven as follows.

The lower end of the shaft F passes through a washer Z, and its tip is fixed to a rotating lever E by a nut D, and a spring G fitted between the washer Z and the nut D
Normally, the shaft F is pulled downward.

Therefore, by energizing the push type solenoid H,
When the other end of the rotating lever E is pushed down by the armature HA, the lever E rotates in the direction of the arrow around the rotating axis EQ, and the shaft F is pushed up.
The engagement portions G ₁ to G ₃ are disengaged from the reel splines V ₁ , V ₄ , and V ₆ due to the elasticity of the collet C.

If the tape reel R is pulled up in this state, it will be removed from the reel boss B'.

However, when such a solenoid is used to drive the shaft F, the smooth rotational movement of the tape reel is hindered by the impact force generated when the solenoid is driven. Also, driving the shaft requires a large amount of energy, which requires a solenoid with a large thrust.

(D) Purpose of the invention The present invention was devised in view of the above points, and an object thereof is to provide a tape reel drive mechanism that can smoothly fix and release the tape reel.

(E) Structure of the invention According to the invention, a reel spline is provided on the inner wall of the hollow rotating shaft of the tape reel, and a plurality of wedge-shaped engaging parts are formed at the upper end.
The lower end part is fitted with the rotating shaft of the motor and is inscribed in the inner wall of the hollow rotating shaft of the reel boss. a shaft having an upper end portion to be fitted into the collet, and a drive means for driving the shaft and the collet in a vertical direction relative to each other, and the collet is engaged by relatively lowering the shaft by the drive means. In the tape reel drive mechanism, the tape reel is coupled to the collet by fitting the reel spline into the reel spline, and the self-moving means is coupled to the rotating shaft of the motor; A cam having a guide through groove in the cam, a sliding shaft inserted through the guide groove of the cam and coupled to the shaft, and a locking means for stopping rotation of the sliding shaft. , by locking the rotation of the sliding shaft by the sliding shaft locking means and driving the motor, the rotation of the motor is caused to slide while the sliding shaft is slid along the guide groove of the cam. This is achieved by providing a tape reel drive mechanism characterized in that the shaft is moved downward depending on the direction so that the engaging portion of the collet is fitted into the reel spline.

(F) Embodiment of the invention Figure 2 is a block diagram of an embodiment of the invention.
Parts equivalent to those in Figures a and b are given the same reference numerals.

In Figure 2, KM is a cam with guide groove AM, BM is a disc spring, and JM is the motor rotation axis.
It is a sliding shaft integrally constructed with J' and slides along the guide groove AM of the cam. _N3 is a screw that fixes the cam KM and the motor rotation shaft J'. H' is a solenoid which is appropriately fixed at one end of the sliding shaft JM by an armature HA' of the solenoid H'. The armature HA′ and the sliding shaft JM are connected as follows.

In FIGS. 3a and 3b, RM is a pivot lever having a pivot shaft DM, one end fixed to the armature HA' of the solenoid H', and the other end fixed to the spring BM.

When solenoid H′ is activated, the amateur
Since HA' is attracted and rotates in the direction of arrow YM, the other end of the rotation lever RM engages with one end of the sliding shaft JM and locks it, as shown in FIG.

In addition, when releasing the locking state of rotation of the sliding shaft JM, when the drive of the solenoid H' is released, the rotating lever RM moves in the direction of the arrow ZM due to the return force of the spring BM.
The other end of the rotating lever RM and the sliding shaft
The engagement with JM is released, and the locked state of rotation of sliding shaft JM is released.

Next, the operation of locking the reel by driving the shaft will be explained with reference to FIGS. 2, 4, and 5.

In the perspective view of the cam shown in Fig. 4 and the developed view of the cam shown in Fig. 5, it is assumed that the sliding shaft is initially at point BB, and the sliding shaft JM is stopped from rotating by armature HA' of the solenoid. It is assumed that

Therefore, the sliding shaft JM is located at the lower position, the shaft F fixed to the sliding shaft JM is in a depressed state, and the engaging portions G ₁ to _{G 3} are connected to the reel splines V ₁ ,
_V4 and _V6 , and the tape reel R is fixed to the reel boss B'.

In this state, when the motor is rotated in the forward direction, the cam KM fixed to the motor shaft J' rotates at the same time as the motor shaft J' rotates, so that the guide groove of the cam KM and the sliding shaft
The sliding shaft JM moves downward while sliding with JM,
When the guide groove AM reaches point AA, the rotational movement of the cam KM is stopped by the sliding shaft JM.

In this state, the sliding shaft JM is located at the top.
The engaging parts G ₁ to _{G 3} of the shaft C connected to the KM sliding shaft JM are disengaged from the reel splines V ₁ , V ₄ , and V ₆ , and when the tape reel R is pulled up, the reel boss B' It can be removed from the equation.

Next, in order to fix the tape reel R to the reel boss B' from this state, proceed as follows.

When motor M is rotated in the opposite direction, cam KM also rotates as motor shaft J' rotates, and sliding shaft JM moves downward while the cam guide groove AM and sliding shaft JM slide. However, when the guide groove AM reaches the BB point, the rotational movement of the cam KM is stopped by the sliding shaft JM.

In this state, the sliding shaft JM is located at the lowest position, and the tape reel R is fixed to the reel boss B' as described above.

(G) Effects of the invention As described above, the tape reel drive mechanism according to the invention uses the rotation of the motor to fix and release the tape reel, so there is less mechanical shock and vibration. realizable.

[Brief explanation of the drawing]

Figures 1a and b are block diagrams of a conventional tape reel drive mechanism, Figure 2 is a block diagram of an embodiment of the present invention, Figures 3a and b are diagrams showing a sliding shaft locking mechanism, and Figure 4. is a perspective view of the cam, and FIG. 5 is a developed view of the cam. C: Collet, G ₁ to G ₃ : Wedge-shaped engaging part, B':
Reel boss, F: shaft, R: tape reel,
M: Motor, E: Rotating lever, H: Solenoid,
HA: amateur, KM: cam, JM: sliding shaft,
AM: Guide groove.

Claims (1)

[Scope of utility model registration request] A reel spline is provided on the inner wall of the hollow rotating shaft of the tape reel, and a plurality of wedge-shaped engagement parts are formed at the upper end, and the lower end is fitted with the rotating shaft of the motor, and the hollow rotating shaft of the reel boss. The collet is inscribed in the inner wall of the collet and has a funnel-shaped hollow portion at its upper end, and a shaft has an upper end that is fitted into the funnel-shaped hollow portion, and the shaft and the collet are relatively and a driving means for driving in the vertical direction, and by relatively lowering the shaft by the driving means, the engaging portion of the collet is fitted into the reel spline, and the tape reel is coupled to the collet. In the tape reel drive mechanism, the drive means includes a cam coupled to the rotating shaft of the motor and having a guide through groove in an outer peripheral wall, and inserted into the guide groove of the cam. , comprising a sliding shaft coupled to the shaft and locking means for stopping the rotation of the sliding shaft, the sliding shaft locking means locking the rotation of the sliding shaft, and the motor While causing the sliding shaft to slide along the guide groove of the cam by driving,
A tape reel drive mechanism characterized in that the shaft is moved downward in accordance with the rotational direction of the motor so that the engaging portion of the collet is fitted into the reel spline.