JPH0329782Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tape sagging prevention device for a tape player.

[Technical background of the invention and its problems] When a tape player is brought to a stop state from a tape running state such as play, fast forward, or rewind, and the tape is stopped, the inertia of the rotating reel base or other causes The tape cannot be stopped immediately. Therefore, in a song selection operation, the tape does not stop at a predetermined position, resulting in the beginning of the song being missed.

Conventionally, a mechanism has been proposed in which brakes are provided on the reel bases on both the winding and supply sides, and each reel base is stopped at the same time as the stop operation is performed, thereby stopping the running of the tape. However, even with this conventional type, it is difficult to stop both reel bases completely at the same time due to limitations such as the processing accuracy of each member that makes up the mechanism, and the reel base on the winding side stops slightly earlier. ,
The tape ran for a short time until the supply reel base stopped, and there was a risk that the tape would become slack when both reel bases stopped. and,
When this slack occurs, when the tape is run again, the tape wraps around the capstan shaft or pinch roller, resulting in a malfunction.

[Purpose of the invention] The purpose of the invention is to ensure that the reel base on the supply side stops rotating first, and then the reel base on the take-up side, thereby preventing the tape from sagging and improving the capacity of the capstan. An object of the present invention is to provide a tape sag prevention device that eliminates tape wrapping around a shaft or a pinch roller.

[Summary of the invention] The tape sag prevention of the invention is achieved by providing a brake plate near each reel base that can be engaged only when the reel base rotates toward the tape supply side.
The head plate, which moves backward when the tape player stops, is provided with a brake control cam that engages each brake plate with the respective reel base in its retreat position, so that the head plate moves back and brakes are applied to each reel base when the tape player stops. Even if there is contact, only the reel base on the supply side will be locked,
The reel base on the take-up side continues to rotate under the action of a driving idler to take up slack in the tape.

In addition, the present invention provides a cam for controlling the brake plate and a cam for controlling the idler for driving the reel base on the head plate itself, thereby ensuring the timing of the engagement of the brake and idler, and at the same time This makes it possible to simplify the

[Embodiment of the invention] Hereinafter, an embodiment of the invention will be described in detail with reference to the drawings.

In this example, the reel base 1 on the left side of the figure
A is the winding side, and the right reel base 1b is the supply side, and a brake engaging portion 2 having an uneven shape is provided on the outer periphery of the reel base 1b. Brake plates 4a and 4b rotatably supported by support shafts 3a and 3b are provided near each reel base. Each brake plate is, for example, an L-shaped member, and the distal end edge of one arm (the arm extending outward in the figure) is attached to the lock portion 5 that abuts the edge of the engaging portion 2. The inner inclined edge serves as a relief part 6 for the engaging part 2. Each brake plate has
A spring 7 is provided that always urges the lock portion 5 toward the outer periphery of the reel base, and in this embodiment, this spring 7 is stretched between both brake plates. Further, a guide protrusion 8 extending upward is formed at the tip of the other arm of each brake plate.

A head plate 9 is arranged above these brake plates and each reel base so as to be movable back and forth. That is, the head plate 9 is in the forward position at the bottom in the drawing as shown in FIG. 1 when playing, and in the retracted position at the top in the drawing when stopping as shown in FIG. The head plate 9 is provided with openings 10a and 10b corresponding to the positions of the respective reel bases, from which the reel shafts protrude above the head plate. Brake control cams 11a and 11b, on which the guide protrusion 8 slides, are provided on the inner edges of these openings 10a and 10b. Each control cam presses a guide protrusion 8 when the head plate moves forward, and rotates each brake plate against the force of a spring 7 so that the tip of each brake plate comes to a position away from the reel base. .

By the way, as shown in Figure 3, each reel base 1
Drive gears 12a and 12b that rotate in opposite directions in conjunction with the motor are provided between a and 1b. Idlers 13a and 13b are provided between them. These idlers 13a and 13b are engaged only with the reel base on the winding side when the tape runs, and in the illustrated example, only the idler 13a on the left side is engaged with the reel base 1a.

Note that these idlers only engage with one of the reel bases during stop and play, and must be separated from the reel base when the reel base should rotate at high speed, such as during fast forwarding and rewinding. In the embodiment, a pair of idler control cams 14a and 14b are provided on the head plate 9,
Each idler 13 is connected to the control cams 14a and 14b.
Insert guide pins 15a and 15b provided by extending the upper portions of the support shafts a and 13b. This control cam is
It has a chevron-shaped convex part in the center, and when the head plate moves forward or backward, the guide pins enter the concave parts on both sides of the convex part, allowing the idler and reel base to engage, while the head plate is fast-forwarding while retracting. When in the return position, each idler 13a, 13b is separated from the reel base by this convex portion.

The operation of this embodiment having the above-described configuration is as follows.

During play...Fig. 1, Fig. 3 During play, the head plate 9 is in the forward position, and the brake control cams 11a, 11 provided thereon are in the forward position.
b, each brake plate 4a, 4b rotates against the force of the spring 7, and its tips are separated from both reel bases. On the other hand, the take-up reel base 1a is driven by an idler 13a meshed with a drive gear 12a as shown in FIG. 3 to take up the tape. At this time, the supply reel base 1b is not engaged with the idler 13b and is in a free state, so it is rotated by the tension of the tape pulled out by the capstan shaft and the pinch roller.

During fast forwarding and rewinding At this time, the head plate is in the intermediate position between FIG. 1 and FIG. 2, but in this case as well, the control cam 11
Since the brake plates a and 11b press against the brake plates 4a and 4b, both reel bases can rotate freely. In addition, the convex part in the center of the idler control cam of the head plate that has advanced halfway is the idler 13a, 13b.
, the idlers 13a and 13b are separated from the reel base, and the reel base rotates at high speed under the action of the other fast forward and rewind idlers.

When stopping...Fig. 2, Fig. 4 When the stop operation is performed, the head plate 9 moves backward, and as a result, the control cams 11a and 11b no longer press the brake plates 4a and 4b, so the force of the spring 7 pushes the brake plates. The tip contacts the outer periphery of the reel base. At this time, the shape of the tip of the brake plate is such that it engages only with the reel base approaching from the tip direction, so the locking part 5 at the tip of the brake plate on the supply side engages with the engaging part 2 on the outer periphery of the reel base.
and stops the rotation of the supply side reel base 1b. On the other hand, since the engaging portion 2 of the take-up reel base 1a contacts the relief portion 6 on the inside of the brake plate, the two do not mesh with each other and the take-up reel base 1a becomes rotatable. At this time, as the head plate 9 retreats, the idler control cam engages only the idler 13a on the take-up side with the reel base 1a, so the reel base 1a on the take-up side continues to rotate under the force from the idler 13a. Take up the slack in the tape.

Note that the tape drive motor automatically stops after a certain period of time has passed after the stop operation, but if the slack in the tape is eliminated before the motor stops, the reel base will be operated by the attached friction mechanism. Since the tape rotates idly, no excessive force is applied to the tape.

[Other Embodiments] The present invention is not limited to the illustrated embodiment; for example, a biasing spring may be provided for each individual brake plate, or no spring may be provided at all and the control cam of the head plate may be provided with a biasing spring. Accordingly, the brake plate may be locked and released. Furthermore, the engaging portions between the brake plate and each reel base do not need to be of the illustrated type, as long as they can be locked only in a certain direction, and may be of the ratchet mechanism type. That is, in the present invention, it is sufficient that the take-up reel base is always driven during play and stop.

[Effects of the invention] As described above, according to the invention, the means for engaging the brake plate and the reel base controlled by the head plate has been improved, and when the reel base is stopped, only the reel base on the supply side is stopped and winding is stopped. The tape player has a simple structure in which the take-up side is driven by an idler and continues to rotate, which prevents the tape from sagging and prevents the tape from wrapping around the capstan shaft or the like. Moreover, if the loading/ejecting of a cassette into a tape player is made to go through such a stop state, there will be no inconvenience even if there is slack in the tape of the loaded cassette, and there will be no problem when the cassette is unloaded. Another advantage is that there is no tape slack in the cassette.

In addition, since the brake plate and idler are controlled by the head plate itself, the timing of engagement of the brake and idler can be ensured, and at the same time,
The configuration is simple because other components for brake and idler control are not required.

In particular, in a tape player, the head takes a different position for each mode such as play, fast forward/rewind, and stop, so the head plate on which the head is mounted directly controls the brake and idler to prevent the head from sagging. This has the disadvantage that the brakes and idlers may work inadvertently when the tape player is in other modes.However, in this invention, the sag prevention function can be applied to the tape player by using a simple configuration in which two types of cams are provided on the head plate. It is possible to work reliably only at this stop.

In addition, when the tape player is not playing or stopping, the back and forth movement of the head plate can be used as is to separate the idler from the reel base without using any other parts, and other functions such as fast forward and rewind modes can be used. No idler control member is required during the mode, simplifying the configuration of the tape player.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the brake plate and reel base in play in an embodiment of the present invention, Fig. 2 is a plan view showing the same when the same is stopped, and Fig. 3 is a plan view showing the idler and reel base in play. Figure, 4th
The figure is a plan view showing the same as the above when stopped. 1a, 1b... Reel base, 2... Engaging portion,
4a, 4b...brake plate, 9...head plate, 11a, 11b...brake control cam, 13
a, 13b...idler, 14a, 14b...idler control cam.

Claims (1)

[Scope of Claim for Utility Model Registration] A brake plate is provided near each reel base that can be engaged only when the reel base is on the supply side, and the tape player has a head that moves back and forth between play and stop. A plate is provided, and the head plate is provided with a brake control cam and an idler control cam, and the brake control cam is shaped to engage the brake plate and the reel base when the head plate is retreated to the stop position, and the idler The control cam engages the idler with the reel base on the take-up side when the head plate moves forward.
A tape sagging prevention device characterized in that the idler is separated from the take-up reel base at the intermediate position of the head plate, and the idler is engaged with the take-up reel base at the retreat position.