JPH02166649A - Brake for reel of magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify a device by providing a tension generating mechanism required when a tape is delivered in the inside of a reel to deliver the tape, and performing the selection of a rotating direction required for the generation of tension by the operation of a member arranged so as to always be engaged with the reel. CONSTITUTION:A reel lock 40 provided in the inside of the reel, a gear reel lock 38 consisting of a lock gear 46 always engaged with the reel lock 40 and a second spring 49 for a second felt 47 are provided. Furthermore, a lock lever 45 engaging/disengaging with the reel lock 40 by being rotated by a slipping force by the second felt 47 and the second spring 49 is provided. And the detection of the rotating direction required brake is performed by engaging/ disengaging the lock lever 45 with the reel lock 40 by the rotation of the gear lock 38. In such a way, it is possible to apply the tension on the tape only when it is fed at need, and to simplify the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a reel braking device for controlling the rotational torque of a reel when it is being driven in a magnetic recording/reproducing device.

[Prior Art] FIGS. 8 and 9 are plan views showing a conventional reel braking device. In the figure, (1) is a drum with a built-in magnetic head, (2) is a magnetic tape, (3) is a fixed tape guide, (4), (5), (6), (7), (8), (
9) is a movable tape guide, (10) is a magnetic tape (
(11) is a tension arm that holds the tension bin (10);
2) is a tension spring that generates a force in the tension arm (11) that resists the tension of the magnetic tape (2);
13) is a supply reel for supplying magnetic tape (2);
4) is a brake band that applies braking force to the supply reel (13), (15) is a capstan, and (16) is a pinch roller (17) that presses the magnetic tape (2) against the capstan (15) is a take-up reel. The gear reel that drives the (
18) is an idler gear that drives the gear reel (17);
(19) is a pulley gear that drives the idler gear (18); (20) is an idler pulley that is directly connected to the pulley gear (19) and receives driving force from a motor that drives the capstan (15), although not shown; 21) is a relay gear that transmits the rotation of the gear reel (17) to the take-up reel gear in the cassette; (22) is a cassette case; (22) is a cassette case;
3) is the deck base, (24) is the gear reel (17)
The brake (25) is a spring that generates braking force.

FIG. 10 is a cross-sectional view of a mechanism for driving a conventional take-up reel. In the figure, (26) is a shaft (27) that rotatably holds a gear reel (17), and a relay gear (26) is a shaft (27) that rotatably holds a gear reel (17).
21), (28) is a take-up reel for winding the magnetic tape (2), (29) is a leaf spring, (30) is a shaft that rotatably holds the take-up reel (2), (
31) is a locking washer, (32) is an idler gear (
18) is the arm that holds it, (33) is also the shaft,
(34) is a slip gear that obtains the rotational force of the idler gear (18), and is rotatably fitted into the gear reel (17). (35) is a housing press-fitted onto the gear reel (17) and rotatably fitted onto the shaft (26); (36) is a slip gear (3) fitted onto the gear reel (17);
4) is a felt that transmits the rotational force at a constant value, and (37) is a spring that generates the rotational force of the constant value.

Next, the operation will be explained. FIG. 10 shows a cross section of the mechanism for winding the magnetic tape (2) onto the take-up reel (28) in the cassette when reproducing the magnetic tape (2).

The rotational force from the idler gear (18) is transferred to the slip gear (3).
4), transmitted to the take-up reel (28) via the felt (36), gear reel (17), and relay gear (21);
A magnetic tape (2) is wound up. FIG. 8 shows a normal reproduction state, that is, a state in which the magnetic tape (2) is being fed in six directions. In this state, the brake (24) is not in contact with the housing (35) that is integrated with the gear reel (17).

FIG. 9 shows the state of magnetic tape feeding during reverse reproduction, that is, the state in which the magnetic tape (2) is being fed in the direction B in the figure. In this state, the gear reel (17)
The brake (24) is attached to the housing (35) that is integrated with the
It is necessary to contact with a constant pressure and apply tension to the magnetic tape (2) via the housing (35), gear reel (17), relay gear (21), and take-up reel (28) shown in FIG. Incidentally, during reverse playback, the idler gear (18) in FIG. 10 is disengaged from the slip gear (34).

[Problem to be solved by the invention J] Since the conventional reel braking device is configured as described above, the brake (24) that applies tension to the tape must be operated depending on the feeding direction of the magnetic tape (2) each time. In order to solve the above-mentioned problems, this invention has the following problems: the mechanical structure for performing the operation is complicated, and a motor as a driving force source for the operation is also required. This is a magnetic recording and reproducing device that eliminates the structure for brake operation and can apply tension to the tape only in the required tape feeding direction without using the motor that was the drive source for conventional brake operation. [Means for Solving the Problems] In order to achieve the above object, a reel braking device according to the present invention is provided inside a reel, or is provided with a reel lock and the sole of the reel. A gear reel lock consisting of a lock gear that always engages with the lock, a second felt, and a second spring, and is rotated by the slip force of the second felt and second spring to engage and disengage from the reel lock. The lock lever, which is rotated by the slip force of the second felt and the second spring, detects the direction of rotation that requires braking, and the lock lever is rotated by the slip force of the second felt and the second spring. This is done by engaging and disengaging.

[Effect]

In this invention, the reel braking force that generates the tape tension is generated by stopping a part of the slip mechanism provided inside the reel, and the force that stops the part is generated by constantly engaging the reel. This can be achieved either by a lock lever of a gear reel lock that has an internal mechanism for slipping under a light load, or by engaging the reel lock of the reel.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. Figures 1 and 2 are plan views, Figure 3 is a sectional view showing the driving force transmission mechanism of the reel, Figure 4 is an enlarged sectional view showing the gear reel part, and Figure 5 is a plan view showing the lock gear part. , FIG. 6 is a partially cross-sectional side view of FIG. 5, and FIG. 7 is a cross-sectional view showing the driving force transmission mechanism of the reel, and parts that are the same as or equivalent to those of the conventional device are designated by the same reference numerals. omitted. In the figure, (17A) is a gear reel, (38)
is the gear reel lock, (39) is the stopper (4o) is the reel lock, (41) is the first felt that transmits the slip force to the gear reel (17A), and the gear reel (17A)
The paste is fixed. (42) is the first felt (4
1); (43) is a spacer provided to prevent the first spring (42) from directly contacting the reel lock (40); (44) is a housing; Press-fitted and fixed. (45
) Lock lever 1 (
46) is a lock gear that always meshes with the reel lock (40) and whose rotation is transmitted to the lock lever (45) by slipping force via the second felt (47); (48) is a housing; 45). (49) is a second spring that pressurizes the second felt (47) to generate slip force, and (50) is provided so that the second spring (49) does not come into direct contact with the lock gear (46). The spacer (51) is a shaft that rotatably holds the housing (48) and the lock lever (45).Next, the operation will be explained. When playing the magnetic tape (2), please play the magnetic tape (2) as shown in Figure 1.
is sent in six directions. At that time, the magnetic tape (2) is wound onto the take-up reel (28) by the mechanism shown in FIGS. 7 and 3 without applying any braking force to the gear reel (17A). vinegar·
In other words, the idler gear (18) and reel lock (
40), first felt (41), gear reel (17A
), the winding force is transmitted to the relay gear (21) in FIG. 3, and the magnetic tape (2) is wound onto the take-up reel (28).

Next, in order to reversely reproduce the magnetic tape (2), the magnetic tape (2) is fed in the direction B as shown in FIG.

At that time, it is necessary to apply braking force to the gear reel (17A) to apply tension to the magnetic tape (2).

The braking force is determined by the lock lever (
The claw portion (45a) of the reel lock (45) shown in FIG.
) (Figure 2 shows the same operation in progress), the reel lock (40) is locked in Figure 3.
is stopped from rotating. At that time, the tension of the magnetic tape (2) rotating the gear reel (17A) via the relay gear (21) is increased by the amount of pressure applied by the first felt (41) by the first spring (42). A rotational braking force is added through the brake, which becomes the braking tension.

Next, the swing of the lock lever (45) is controlled by the lock gear (46) engaged with the reel lock (40) in FIG.
) rotates in direction C in Fig. 5, the rotational force is transmitted to the lock lever (45) as a frictional force with the second felt (47) pressurized by the second spring (49). Then, the claw part (45a) provided at the tip of the lip lever (45) rotates in the C direction and bites into the claw part (40a) of the reel lock (40) in FIG. The rotation of the lock gear (46) after being engaged is caused by the second felt (47)
It's always slipping.

Further, when the lock gear (46) rotates in the D direction in FIG. 5, the claw portion (45a) of the lock lever (45) rotates in the D direction, and the claw portion (40a) of the reel lock (40) in FIG.
), and the state becomes as shown in Figure 1.

[Effects of the Invention] As described above, according to the present invention, the tension generation mechanism necessary for feeding out the tape is provided inside the reel that feeds out the tape, and the rotation direction in which the tension generation is necessary is always selected by the reel. Since it is constructed of members arranged to mesh with each other, the device can be made at low cost, and there is no need for the motor that is operated to operate the conventional braking device.

[Brief explanation of the drawing]

1 and 2 are plan views according to an embodiment of the present invention, FIG. 3 is a sectional view showing the driving force transmission mechanism section of the reel shown in FIG. 1, and FIG. 4 shows the gear reel section shown in FIG. 3. 5 is a sectional view showing the lock gear portion of FIG. 1, FIG. 6 is a partially sectional side view of FIG. 5, and FIG. 7 is a sectional view of the reel driving force transmission mechanism of FIG. 8 and 9 are plan views showing a conventional reel braking device, and FIG. 10 is a sectional view showing the reel driving force transmission mechanism section of FIG. 8. In the figure, (2) is the magnetic tape, (13) is the supply reel, (17A) is the gear reel, (28) is the take-up reel, (38) is the gear reel lock, (40) is the reel lock, and (41) is the A first felt, (42) a first spring, (45) a lock lever, (46) a lock gear, (47) a second felt, and (49) a second spring. In addition, the same reference numerals in the figures indicate the same or equivalent parts.
Patent Attorney Masuo Oiwa Figure 1 Figure 2 Figure 38;

Claims (1)

[Claims] (1) In a magnetic recording and reproducing device in which a pair of reels on which magnetic tape can be wound are loaded in parallel, the tension of the magnetic tape is maintained by the slip force caused by a first felt and a first spring provided inside the reel. A reel braking device that obtains a reel braking force to control the reel, which comprises a reel lock provided inside the reel, a lock gear that constantly engages with the reel lock, a second felt, and a second spring. a reel lock; and a lock lever that is rotated by the slip force of the second felt and the second spring to engage and disengage from the reel lock, and detects the direction of rotation that requires the braking. Magnetic recording characterized in that the lock lever, which is rotated by the slip force of a second felt and a second spring, engages and disengages from the reel lock by rotation of the gear reel lock. Reel braking device for playback equipment.