JPH0752534B2 - Tape winding device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape winding device provided in a magnetic recording / reproducing device such as a VTR or a tape recorder, and in particular, for switching a reel base that is rotationally driven. The required driving torque is reduced.

(Prior Art) FIG. 5 and FIG. 6 show a conventional tape winding device that switches a reel base that is rotationally driven. FIG. 5 is a plan view of a conventional tape winding device, and FIG. 6 is a sectional view taken along line AA of FIG.

In FIG. 5 and FIG. 6, two reel bases 2 and 3 are rotatably arranged on the chassis 1, and a shaft 4 is vertically provided on the chassis 1 between the reel bases 2 and 3. A center pulley 5 is rotatably disposed in the. The center pulley 5 is rotationally driven by a motor via a coupling mechanism (not shown). An arm 6 is swingably disposed between the reel bases 2 and 3 with the shaft 4 as an axis, and an idler 7 is rotatably disposed at its free end. The idler 7 is meshed with the center pulley 5 by a gear, and the arm 6
Is engaged with the gear of either one of the reel bases 2 or 3 at a position near the swing. Further, a friction member 8 such as felt is interposed between the arm 6 and the idler 7, and the elastic force of the coil spring 9 causes the idler 7 to move.
It is elastically contacted with the arm 6 via. The chassis 1 is appropriately provided with an opening 10 so that the arm 6 can swing between the reel bases 2 and 3. In addition, the main brake 1 that applies the braking force to the reel bases 2 and 3 in the stop mode
Appropriate brakes such as 1,11 and stop mode, fast-forward mode, rewind mode, back tension brakes 12,12 that apply a slight braking force to the reel stands 2 and 3 during tape loading operation and tape reversal. Means are provided.

In such a configuration, when the center pulley 5 is rotationally driven in the direction of arrow D in FIG.
A frictional resistance force generated between and acts in a direction in which the rotation of the idler 7 is stopped, and a force that biases the arm 6 toward one reel stand 2 side in FIG. 5 acts. Therefore, the idler 7 and the reel base 2 are meshed with each other by a gear, and the reel base 2 is rotationally driven in the tape winding direction. Further, when the rotational driving direction of the center pulley 5 is switched to the direction opposite to the arrow D, a counterclockwise force that causes the other reel stand 3 to swing the arm 6 due to frictional resistance generated between the arm 6 and the idler 7. And the idler 7 meshes with the gear of the other reel stand 3. In this way, by switching the rotational driving direction of the center pulley 5, the reel stand 2 or 3 for winding the tape is switched.

(Problems to be Solved by the Invention) In the above-described conventional tape winding device, in order to swing the arm 6 by switching the rotational driving direction of the center pulley 5, the arm 6 and the idler 7 are not moved. The frictional resistance must be applied to. In order to smoothly swing the arm 6 between the reel bases 2 and 3 even in a situation where the reel bases 2 and 3 are in the vertical position, a driving torque of several g / cm as a friction resistance force. Is required.
Therefore, when the reel base 2 or 3 is rotationally driven, the drive torque that totals the drive torque that rotationally drives the reel base 2 or 3 and the drive torque corresponding to the frictional resistance force for switching the reel bases 2 and 3 is Required for center pulley 5. As a result, particularly when a large initial drive torque is required, if a motor with a large output torque is used as a drive source, the device as a whole becomes expensive, and if a motor with a small output torque is used as a drive source. However, there is a problem that the reduction ratio cannot be set large and the wow and flutter value is deteriorated.

An object of the present invention is to solve the above-mentioned problems of the conventional tape winding device, and to provide a tape winding device in which the driving torque required for switching the rotation drive of the reel base is reduced. It is in.

(Means for Solving the Problems) In order to achieve such an object, the tape winding device of the present invention has a center pulley, which is driven to rotate, disposed between two reel stands. An arm is swingably mounted on a coaxial core, and an idler meshingly connected to the center pulley is rotatably disposed at a free end of the arm, and the arm is swung in accordance with a rotational driving direction of the center pulley. The idler is moved to mesh with one of the reel bases to rotationally drive one of the reel bases, and at the time of switching the rotational drive direction of the idler, at least a new supply side of the reel base is provided. In the tape winding device provided with a braking means for acting a braking force on one side, when the arm swings between the two reel stands, the idling is performed. A fixed fan-shaped gear that meshes with each other is arranged in an arc shape centered on the axis of the center pulley, and both ends thereof are arranged close to the idler at a position for rotationally driving the reel base.

(Operation) Therefore, when the rotation drive direction of the center pulley is switched, the braking force acts on the reel base that has been meshed and connected so far, and the idler slightly moves to revolve on the gear of the reel base. , Meshes slightly with the fan gear. Then, the idler rotates while meshing with a fan-shaped gear fixed in an arc shape centered on the axis of the center pulley, and the arm moves to the other reel stand side. Further, when the idler slightly meshes with the gear of the other reel base, the idler moves so as to revolve on the gear of the other reel mount, and is brought into a state of sufficiently meshing with the gear of the other reel mount.

Therefore, the idler is surely moved and switched from one reel stand side to the other reel stand side and in the opposite direction.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a plan view of an embodiment of a tape winding device of the present invention, FIG. 2 is a sectional view taken along the line BB of FIG. 1, and FIG. 3 is one reel stand. FIG. 4 is a diagram for explaining a gear meshing state in a state in which is rotationally driven, and FIG. 4 is a diagram for explaining the movement of the gear when the rotational drive direction of the center pulley is switched. 1 to 4
In the figure, the same members as those in FIGS. 5 and 6 are designated by the same reference numerals, and the duplicated description will be omitted.

First, in FIGS. 1 and 2, FIGS.
A structure different from that shown in the drawing will be described. Arm 20 which is swingably arranged a shaft 4 as the shaft core, the idler 7 is rotatably disposed on one of the free end, the free end of the opposite side of projection 20 _a is formed. Then, when the arm 20 swings, the protrusions 20 _a are formed on the stoppers 21 and 22 that are provided so as to project from the chassis 1.
Abut, and the swing range of the arm 20 is restricted. here,
A coil spring 9 is provided between the idler 7 and the arm 20 so that the friction member 8 is not interposed and the idler 7 is elastically contacted with the arm 20 via the friction member 8 as in the conventional device shown in FIGS. Is not installed, idler 7
Is rotatably arranged on the arm 20 without frictional resistance. Further, the internal gear 23, which is a fan-shaped gear fixed in an arc centered on the shaft 4 of the center pulley 5 so that the idler 7 that moves with the swing of the arm 20 meshes with the reel bases 2 and 3. In between, it is arranged close to the idler 7 at a position where both ends thereof are driven to rotate by the reel bases 2 and 3 within a range where they do not mesh. The internal gear 23 is arranged on the chassis 1 together with other mechanical parts (not shown) by outsert molding or the like.

Next, the operation will be described with reference to FIGS. Third
In the figure, when the center pulley 5 is rotationally driven in the direction of arrow D in FIG. 3, the idler 7 is meshed with the gear of one reel base 2 to rotationally drive the reel base 2, and the reel base 2 drives the tape. Is wound up. Where idler 7
A force in the direction of arrow R in FIG. 3 acts on the arm 20 to swing it, but the swinging is restricted by the contact of the protrusion 20 _{a with} the stopper 21. And in this state, idler 7
Needless to say, does not mesh with the internal gear 23.

In such a state, in order to drive the reel base 2 to rotate, it is sufficient that a drive torque required to drive the reel base 2 to rotate is applied to the center pulley 5, which is smaller than a conventional device of this type. Torque is enough.

Here, when the rotational drive direction of the center pulley 5 is switched and rotationally driven in the direction opposite to the arrow D direction in FIG. 3,
At this time, as shown in FIG. 4, the back tension brake 12 is operating on the reel base 2 and some drive torque is required to reverse the reel base 2. Therefore, the idler 7 revolves on the gear of the reel base 2. Thus, the force in the direction of the arrow L in FIG. 4 acts, and the arm 20 is slightly moved in the direction of the internal gear 23. When the idler 7 slightly meshes with the internal gear 23, the idler 7 meshes with the internal gear 23 and rotates in the direction of arrow L in FIG. In the movement of the idler 7 that meshes with the internal gear 23, the frictional resistance force of the conventional device of this type does not act. In this way, idler 7
Is connected to the other reel base 3 by the internal gear 23 to be rotationally driven by the center pulley 5 so that the reel base 3 is securely moved.
When the idler 7 slightly meshes with the gear, the idler 7 revolves on the gear of the reel base 3 due to the winding torque acting on the reel base 3 and the gears are sufficiently meshed.

By the way, the center pulley 5, idler 7, and reel stand 2,
If the shafts 3 are meshed with each other so that their axes are linearly arranged, the distance that the idler 7 moves so as to revolve on the gears of the reel bases 2 and 3 becomes the longest. The longer the distance that the idler 7 moves while meshing with the gears of the reel bases 2 and 3, the more reliably the meshing with the internal gear 23 is switched. When the center pulley 5, the idler 7, and the reel stands 2 and 3 are meshed with the gears so that their axes are linearly arranged, the idler 7 swings to the reel stands 2 and 3. It is not regulated by meshing. Therefore, projections 20 _a and the stopper 21 to restrict the swinging range of the arm 20 is disposed. If the angle formed by the center pulley 5, the idler 7, and the axes of the reel bases 2 and 3 is an obtuse angle close to 180 degrees as shown in Fig. 1, the gear of the idler 7 should dig deep into the gears of the reel bases 2 and 3. it is necessary protrusion 20 _a and the stopper 21 and 22 also restrict the swinging range of the arm 20. However, the swinging range of the idler 7 may be restricted by the reel bases 2 and 3 if the idler 7 is moved away from 180 degrees.

If the internal gear 23 is arranged on the chassis 1 by outsert molding as in the above-described embodiment, the number of parts is small and it can be manufactured inexpensively. However, the internal gear 23 is fixed to the chassis 1 by an appropriate fixing means such as a screw. You may. Further, the gears at both ends of the internal gear 23 may be elastically deformable in the radial direction of the gear to facilitate the meshing of the idler 7. Further, in the above embodiment, the fan gear is composed of the internal gear 23, but a fan gear having external teeth with the same diameter as the center pulley 5 is fixed in an arc shape centered on the shaft 4 of the center pulley 5, and the idler 7 May be arranged close to each other within a range in which they mesh with each other when they swing, and both ends thereof are not meshed with the idler 7 at the position where the reel bases 2 and 3 are driven to rotate. And, the regulation of the swing range of the arm 20 is
Of course, it is not limited to the above embodiment. Further, when the rotational drive of the center pulley 5 is switched, the reel stand 2 or 3 which is at least newly provided on the supply side is slightly moved by either the back tension brakes 12, 12 or the braking means of the main brakes 11, 11. It suffices if the braking force is working.

(Effect of the Invention) As described abnormally, according to the tape winding device of the present invention, when the idler is swung to switch the rotation drive of the reel base, the friction resistance force of the conventional device of this type is used. Since it is not used, it suffices that the center pulley be provided with a drive torque sufficient to drive the reel base to rotate. Therefore, if the output torque of the drive source is reduced, the device can be manufactured at low cost, and if the reduction ratio is increased, the flutter / flutter value can be improved. Moreover, the number of parts is reduced, and the number of assembling steps is accordingly small, which is suitable for mass production. Furthermore, during most of the intermediate stroke of the idler swing path, the idler meshes with the fixed fan gear, and the arm swings as the idler rotates as the idler rotates. Therefore, there is an excellent effect that a reliable swing motion can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a tape winding device of the present invention, FIG. 2 is a sectional view taken along the line BB of FIG. 1, and FIG. 3 is one reel stand. FIG. 4 is a diagram for explaining a gear meshing state in a state in which the gear is rotationally driven, FIG. 4 is a diagram for explaining a movement of the gear when the rotational drive direction of the center pulley is switched, and FIG. 6 is a plan view of the tape winding device of FIG. 6, and FIG. 6 is a sectional view taken along the line AA of FIG. 2,3: reel stand, 4: axis, 5: center pulley, 7: idler, 11: main brake, 12: back-enhance brake, 20: arm, 23: internal gear.

Claims (2)

[Claims] 1. A center pulley which is driven to rotate is disposed between two reel stands, and an arm is swingably disposed coaxially with the center pulley. The center pulley is provided at a free end of the arm. An idler that is meshed with the reel stand is rotatably provided, and the arm is swung in accordance with the rotational drive direction of the center pulley to mesh the idler with one of the reel stands to connect the idler to the reel stand. In the tape winding device, which is provided with a brake means for rotating one of them and for applying a braking force to at least one of the reel bases which is newly provided on the supply side when switching the rotational drive direction of the idler. Fixed fan-shaped gears, which mesh with the idler when the arm swings, are arranged in an arc shape around the axis of the center pulley between the reel stands. Across the tape winding device, characterized in that it has said in proximity to idler disposed in a position for rotationally driving the reel stand. 2. The tape winding device according to claim 1, wherein the sector gear is an internal gear.