JPS58175159A - Reel shaft driving device - Google Patents

Abstract

PURPOSE:To simplify the structure to make it small-sized and to apply a back tension properly, by releasing the friction mechanism of a take-up reel in accordance with the direction of tape running and operating always only the friction mechanism of a supply reel. CONSTITUTION:An idler 2 is set on a turning plate 3 which is attached freely rotatably around a fulcrum 6. The turning plate 3 is floated in the direction of an arrow 5 by the rotation frictional force between the idler 2 and an idler bearing 4, and the rotation of a driving wheel 1 is transmitted to turn a reel shaft 7 in the direction of an arrow 26 by contact and rotation of a reel base 8 having the reel shaft 7 and the idler 2. If the driving wheel 1 is rotated in the direction opposite to the direction of an arrow 11, the rotation of the driving wheel 1 is transmitted to the idler 2, and the turning plate 3 is floated in the direction opposite to the direction of the arrow 5, and a reel base 10 having a reel shaft 9 and the idler 2 are brought into contact with each other and are rotated, and therefore, the rotation of the driving wheel 1 is transmitted to turn the reel shaft 9 in the direction of an arrow 27. Since the reel shaft driving system and a back tension function are independent of each other completely when a tape is run, tape running is stabilized for normal-speed tape running and high-speed tape running, and the strength of the back tension is controlled independently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel shaft drive device in a tape running device such as an audio tape recorder or a video tape recorder, and particularly relates to a reel shaft drive device for appropriately applying pack tension to a rotating reel according to the running direction of the tape. The object of the present invention is to provide a reel shaft drive device that can perform the following steps.

Generally, 1. Pack tension must be applied to a reel shaft drive device in a tape running device when the tape is running. This pack tension function during tape running is essential for smooth running of the tape or for good tape contact.As a method for this purpose, a felt pad or a Known methods include a pad and spring method in which a friction body is provided using a spring, a belt method that also serves as a counter belt, and a motor method that reversely rotates the supply reel to obtain pack tension.

These pad, spring, and belt systems are used in most popular tape recorders because pack tension can be applied easily and inexpensively. Normal 1. Since pack tension is necessary during normal feeding, fast forwarding, and rewinding, it is necessary to provide it on both the tape supply reel and take-up reel.

However, in the pad-spring method and the belt method, the load is always applied to the supply and take-up reel shafts, so when the tape is running, the pack tension mechanism of the take-up reel is This causes an unnecessary increase in the load on the shaft drive motor, increases the power consumption of the tape recorder, and is a major factor that hinders the continuous use of the tape recorder for long periods of time, especially in battery-powered devices such as small vertical tape recorders. ing. Also,
The motor-type pack tension has the disadvantage that it requires a servo mechanism and is expensive because the tape tension changes significantly between the start and end of tape winding depending on the difference in reel diameter.

In view of the drawbacks of the conventional pack tension application method, the present invention releases the friction mechanism of the take-up reel depending on the tape running direction, for example, during normal feeding, and always operates only the friction mechanism of the supply reel. The structure is such that bank tension is obtained by applying force. This configuration has the advantage that it has a simple structure, can be easily downsized, and can apply pack tension appropriately at low cost.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The reel shaft drive device of the present invention will be described below with reference to drawings of embodiments.

1, 2, and 3 show an embodiment of the present invention. In the figures, assuming that the rotation direction of a drive wheel 1 such as a motor pulley is in the direction indicated by an arrow 11, The rotation of 1 is transmitted to the idler 2 which has a rubber lining 25 on its outer periphery. This idler 2 is installed on a rotating plate 3 rotatably attached at a fulcrum 6. The rotational friction force between the idler 2 and the idler bearing 4 causes the rotation plate 3 to freely move in the direction of the arrow 6, and the reel stand 8 having the reel shaft 7 and the idler 2 come into contact, causing the drive wheel 1 to rotate. is transmitted so as to rotate the reel shaft 7 in the direction of the arrow 26. At this time, the rotating plate 3 is linked to the other arm 12 at the rotational fulcrum 6, and
3, the other end of the rotatable arm 12 is connected to the other end of the rotatable arm 12 by a spring 14 with one end fixed, so that the close contact with the drive wheel 1, idler 2, and reel stand 8 is improved, and the transmission of rotation is efficiently transmitted. be able to. On the other hand, when the drive wheel 1 rotates in the direction opposite to the direction shown by the arrow 11, the rotation of the drive wheel 1 is transmitted to the idler 2, the rotating plate 3 moves in the direction opposite to the direction shown by the arrow 5, and the reel Due to the contact between the reel stand 10 having the shaft 9 and the idler 2, the rotation of the drive wheel 1 is transmitted so that the reel shaft 9 rotates in the direction of the arrow 27. At this time, the urging force of the spring 14 provided at the other end of the arm 12 acts on the rotating plate 3.

The adhesion between the drive wheel 1, the idler 2, and the reel stand 1° is improved, and transmission of one rotation can be efficiently transmitted. Therefore, this reel shaft drive device uses a special mechanism (such as a plunger mechanism) to maintain the idler position.
Normal forwarding, fast forwarding, and rewinding are possible without the need for Reference numeral 16 denotes a tension mechanism that responds to the movement of the rotary plate 3. The basic configuration of the pack tension mechanism 16 includes an arm lever 16 and a bad arm 17, as shown in FIG.
18 are connected at a fulcrum 23. Moreover, these can rotate together at the fulcrum 23. At the tips of the pad arms 17 and 18, there are pads 19.2 that act as friction bodies such as felt.
0 is attached.

Furthermore, fixing pins 22' and 22' are erected on both upper and lower surfaces at the end of the arm lever 16 on the opposite side from the fulcrum 23, and a spring 21 is installed in a tensioned state on the pin 22 side. This spring 21 passes over a rotation fulcrum 23 of the pack tension mechanism and is fixed at a fixed end 26. The state of engagement between the pack tension mechanism section and the reel shaft drive mechanism section described above will be described, and how the pack tension mechanism section will rotate in conjunction with the reel shaft drive mechanism section will be explained. As shown in FIG. 6, there is a substantially circular notch 24 at the tip of the rotating plate 3, into which a fixing pin 22' placed at the tip of the arm lever 16 of the friction mechanism is secured. has been done. In a neutral state where the drive wheel 1 stops rotating and the rotating plate 3 (or idler 2) is approximately in the center of both reel shafts, the arm lever 16
The fixing pin 22' and the rotating plate 3 are not in contact with each other and are independent from each other. When the rotating plate 3 is temporarily switched from the reel stand 1o side to the reel stand 8 side, that is, as the drive wheel 1 is reversed, the idler 2 rotates on the circumferential surface of the drive wheel 1 and the reel stand 1o is rotated. When it comes off the sliding surface, as shown in FIG. 4, the fixed pin 22' and the rotating plate 3 come into contact with each other as the rotating plate 3 rotates, and in conjunction with this, the arm lever 16 starts rotating.

In this way, the idler 2 separates from the reel stand 1° and moves away from the rotating plate 3 to the fixed pin 22' until it reaches the neutral point.
Through this, a rotational force transmission path to the arm lever 16 is formed. After the arm lever 16 passes the midpoint between both reel stands, the spring 21 installed on the arm lever 16
The compressive force automatically reaches the second stable state, that is, the state in which the pad 20 on the pad arm 18 is in contact with the reel stand 1o. Figure 1 shows this state, where the drive wheel 1
The rotational force of is transmitted to the reel shaft 7. At this time, the pad 20 of the pad arm 18 is attached to the reel stand 1 on the reel shaft 9 side.
It will be in contact with o. For example, when a cassette tape is mounted in this device and the tape starts running by the drive reel shaft 7 (the reel stand 8 rotates in the direction of arrow 26 in FIG. 1), the tape supply reel is free from the rotational driving force of the motor. The reel stand 1o on the shaft 9 side rotates in the direction of the arrow 27, the pad 2o applies pack tension to the tape running, and when the rotation of the drive reel shaft 7 stops, the pad 20 rotates the reel stand 1°. Since it absorbs the moment of inertia due to the inertia and acts as a brake, tape running can be stopped instantaneously without tape sagging. When the tape is running, the rotating plate 13 and the fixing pin 22' on the arm lever 16
There is no contact between them and they are independent of each other, and the force transmission path is cut off. When the direction of rotation of the drive wheel 1 is reversed to the direction of the arrow 11, the idler 2 separates from the reel stand 8, and the rotating plate 3 rotates while lifting the fixed pin 22' on the arm lever 16, passing through the neutral point and rotating the idler 2. is reel stand 1
When the tape touches the o side, it begins to move backwards. At this time, the back tension mechanism completes its rotation with the pad 19 on the pad arm 17 coming into contact with the reel stand 8. In addition, in the figure, 30 is a motor, and 31.32 is a board. . Note that a notch may be provided at the tip of the arm lever 16 and this may be coupled to the rotating shaft 4 of the rotating plate 3.

Specifically, /(In order to perform the tension function reliably, the difference between the rotational force F of the rotation plate 3 and the force F' necessary for rotating the arm lever 16 in FIG. 6 is F)F'
This relationship is necessary. In addition, to adjust the pressure of the pad against the reel stand, which acts as back tension, use the F
) This is achieved by controlling the strength of the spring 21 while satisfying F'. Further, the pressing force P of the pad that applies back tension to the circumferential surface of the reel stand must not be greater than the rotational force F of the rotation plate 3. Furthermore, it is preferable that the sliding contact portions on the pad and reel stand peripheral surfaces be in the vicinity of the contact point of a tangent drawn from the rotation center of the pad arm to the circumference of each reel. It is also best to keep the rotational friction at the fulcrum of the pack tension mechanism as small as possible.

As described in detail above, according to the present invention, the reel shaft drive system and the pack tension function are completely independent during tape running, so tape running can be stabilized during normal and high speed conditions, and the bank tension The strength of can be controlled independently. In addition, selective rotation of the pack tension mechanism is achieved by the rotational force of the idler of the reel shaft drive system only when switching between forward and reverse tape running, and the pack tension mechanism is self-supported during tape running, so the structure is extremely simple. simple.

Moreover, it is possible to realize an inexpensive pack tension function. In addition, the forward/reverse movement of the tape and the selective direction rotation of the pack tension function can all be achieved by forward/reverse rotation of a single motor in an extremely short time, resulting in power savings and making it ideal for battery-powered portable types. It has advantages.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram at a neutral point showing an embodiment of the reel shaft drive device of the present invention, FIG. 2 is a configuration diagram of the same device when the tape is running, and FIG. 7
A line sectional view, FIG. 4 is a perspective view of the structure of the tension mechanism section in the same device, and FIG. 6 is a structure diagram of the joint section of the tension mechanism section and the reel drive mechanism section in the same device. 1... Drive wheel, 2... Idler, 3
... Rotating plate, 8, 10 ... Reel stand,
9,7...Reel axis. 12... Arm, 14, 21... Spring, 16... Arm lever, 17.18.
...Pad arm, 19.20...Put, 22, 22'...Pin, 24...
...Notch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 9? Figure 5

Claims (3)

[Claims] (1) A supply reel shaft and a rotatable rotary plate that is brought into contact with the circumferential surface of the driving wheel by a suppressing means and that is integrated with an idler that can rotate on the circumferential surface of the driving wheel are wound up. It is installed between the reel axes, moves the rotating plate according to the forward and reverse rotation of the drive wheel, automatically selects one of the two reels, and selects the rotation of the drive wheel via the idler. The reel shaft is configured to transmit the information to the reel shaft, and
In order to be able to swing in conjunction with the movement of the rotating plate, an arm lever and two hat arms that extend to the left and right of this lever and have pads at their tips are integrated at the fulcrum that serves as the axis of rotation. A rotatable back tension mechanism is provided, and one of the two pad arms integrated as the back tension mechanism selectively supplies the tape in response to the rotating plate. A reel shaft drive device characterized in that it is configured to act as back tension on the reel shaft side. (2) 7 A+/ at one end of the pack tension mechanism
The tip of the bar has an extended spring with the other end attached to a fixed end, and after the rotating plate that transmits rotational force to the arm lever passes its rotational neutral point, the compressive force of the spring causes the The reel according to claim 1, wherein the arm lever automatically rotates, and after the rotation is completed, pack tension is applied to the reel shaft by the throat arm and a pad provided at its tip. Axial drive. (3) The nokunodo attached to the bad arm is
Claim 1, characterized in that the sliding contact portion on the reel circumferential surface is present in a region near the contact point of a tangent drawn from the rotation center of the nod arm to the respective reel circumference. reel shaft drive device.