JPS6398862A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To simplify a back tension load mechanism and to realize the reduction in a loss torque by providing an oscillating gear having a load driven in an opposite direction by a torque of the oscillation gear and providing a regulating member in the operating range of the drive load. CONSTITUTION:The oscillation gear 37 driven in the opposite direction by the drive of the oscillating gear 27 is provided and a 2nd oscillating mechanism consists of a support member 32, an energizing spring 34, a felt 35, a support shaft 36, a felt 38, an energizing spring 39, and a regulating pin 40. Moreover, the opening part 42 of a regulating member 41 takes a position to be driven until the oscillating gear 37 meshes with intermediate gears 10, 12 and a position to be regulated at non-meshing with the intermediate gears 10, 12. As a result, the drive of the oscillating gear 37 caused by the felt 38 and the energizing spring 39 is exerted onto the supply reel base only at fast feeding and exerted onto the winding reel base only at rewinding.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic tape device such as a video tape recorder, and the present invention relates to a magnetic tape device such as a video tape recorder. I tried to avoid it.

Conventional technology Various types of back tension loading mechanisms have been proposed for fast forward and S return operations in magnetic tape devices, and one of the representative ones is our video tape recorder (VTR) product. One example is the soft brake type back tension load mechanism used in the famous ``Matsuku Road U.'' Conventional general, fast forward.

The back tension loading mechanism (hereinafter referred to as bank tension loading mechanism) during the unwinding operation will be explained using FIG. 5. FIG. 5 shows an unloading state in which the magnetic tape (hereinafter referred to as tape) 1 is not pulled out so as to come into contact with a rotating cylinder (not shown) or the like. tape 1
is wound on a supply reel 2 and a take-up reel 3. The output of the capstan motor 100 is transmitted to the center pulley 5 via the belt 4. The center gear 6 rotates integrally with the center pulley 5 and meshes with the swing gear 7. The swinging gear 7 is supported by a support member 8,
It is configured to be rotatable around a center gear 6.

The supply reel 2 has a supply reel stand 9 that rotates integrally therewith, and the supply reel stand 9 is engaged with a relay gear 1O. Similarly, the take-up reel 3 has a take-up reel stand 11 that rotates integrally therewith, and a relay gear 12 meshes with the take-up reel stand 11. Supply side soft brake 13
is rotatable around the support shaft 14, and the supply reel stand 9
A felt 15 is provided where it comes into contact with the felt 15, and a biasing spring 16 and a regulating pin 17 are also provided in a portion thereof. The take-up side soft brake is rotatable around a support shaft 19, and a felt 20 is provided where it comes into contact with the take-up reel stand 11, and a biasing spring 21 and a regulating pin 22 are also attached to the felt 20. It is provided in some parts. The regulating member 23 is movable left and right, and also has cam portions 24 and 25.

Next, the fast forward operation will be explained. In FIG. 5, when the capstan motor 100 rotates counterclockwise, the swing gear 7 rotates around the center gear 6, and the relay gear 1
2 meet each other. As a result, the output of the capstan motor 100 is the same as that of the belt 4. Center pulley 5. It is transmitted to the take-up reel stand 11 via the center gear 6, swing gear 7°, and relay gear 12. The tape 1 is thus rapidly fed from the supply reel 2 to the take-up reel 3. At this time, the force of the biasing spring 16 is transmitted to the supply reel stand 9 by the supply-side soft brake 13 via the felt 15 and acts as a rotational load, so an appropriate back tension is generated in the tape 1. Therefore, fast forwarding operation can be performed without causing so-called debris to be generated on the take-up reel 3. Regarding the unwinding operation, the rotation direction of the capstan motor 100 is clockwise, and the swing gear 7 rotates until it meshes with the relay gear 1o. The rest is exactly the same as the fast forward operation, so the explanation will be omitted. When the tape 1 is pulled out and recording/playback operations are performed, the regulating member 23 moves to the left, and the cam parts 24 and 25 move the regulating pins 17 and 22, respectively, so that the supply side soft brake 13 and the winding The take-side soft brakes 18 rotate around support shafts 14 and 1.9, respectively, and the felts 15 and 20 respectively rotate on the supply reel stand 9.
゜It is separated from the take-up reel stand 11, and no rotational load is generated.

Problems to be Solved by the Invention However, with such a configuration, the take-up side soft brake 18 acts as a rotational load during fast forwarding operation, and the supply brake 18 acts as a rotational load during unwinding operation. Since the side soft brake 13 works as a rotational load, it has the disadvantage that the load on the capstan motor 100 increases and the power consumption increases. Furthermore, since there are two soft brakes, one on the supply side and one on the take-up side, this is very disadvantageous in terms of weight, cost, and ease of assembly. Therefore, the present invention provides a back tension load mechanism that acts only as a puncture tension load during fast forwarding and unwinding operations, and does not serve as a load on the driving side, thereby reducing the power consumption during one fast forwarding and unwinding operation. Not only is this structure reduced, but the structure is also very simple, so it is very advantageous in terms of cost and ease of assembly.

Means for Solving the Problems The technical means of the present invention for solving the above problems includes a rotary load mechanism that rotates in accordance with the rotation of the swinging gear 7, and a rotary load mechanism that rotates when the tape 1 is inside the cassette. A regulating member is provided that is operable only when the vehicle is in the unloading position.

Function The present invention has the above-described configuration, so that during fast forwarding operation, the rotation!
The X loading mechanism works only on the supply reel stand side, and during the unwinding operation, it works only on the take-up reel stand side.

Embodiment Hereinafter, the structure and operation of an embodiment of the present invention will be explained using FIGS. 1 to 4.

1 and 2 are at the so-called unloading position where the tape 1 is inside the cassette 26, and FIG. 3 is at the loading position where the tape 1 is pulled out from the cassette 26. The figure is a sectional view of the swinging means described later. A tape 1 is wound on a supply reel 2 and a take-up reel 3.

The output of the capstan motor 100 is transmitted via the belt 4.
The signal is transmitted to the center pulley 5. The center gear 6 rotates integrally with the center pulley 5 and meshes with the first swing gear 27. The first support member 2nd is the spindle 29
It is rotatable around the felt 31 and is biased in the direction of the felt 31 by a biasing spring 30 . Second support member 32
is rotatable around a support shaft 33 and is biased toward the felt 35 by a biasing spring 34 . Also, the second
A second swinging gear 37 that is rotatable about a support shaft 36 is provided at one end of the support member 32 . felt 3
8 is always urged in the direction of the second swinging gear 37 by the urging spring 39. The regulation pin 40 is connected to the second support member 3
It is provided in part of 2. First swinging gear 27. First support member 28, biasing spring 30. Felt 31. The support shaft 33 constitutes a first swinging means. In addition, the second swinging gear 37. Second support member 32. Biasing spring 34.
Felt 35. Support shaft 36. Felt 38, biasing spring 39
The regulating pin 40 constitutes a second swinging means. The regulating member 41 regulates the regulating pin 40 through the opening 42, and the second oscillating gear 37 is at a position where it can rotate until it engages with the relay gear 10.12 (FIGS. 1 and 2);
The second oscillating gear 37 is configured to take a restricting position (FIG. 3) where it does not mesh with the relay gear 10.12. The supply reel stand 9 rotates integrally with the supply reel 2, is meshed with the relay gear 10, and is connected to the take-up reel stand 11.
rotates integrally with the winding wheel 3 and meshes with the relay gear 12.

Next, the fast-forwarding operation and the rewinding operation will be explained. When the capstan motor 100 rotates counterclockwise in FIG. 1, the center gear 6 also rotates counterclockwise. At this time, since the biasing spring 30 and the felt 31 are present,
Due to the 60 rotations of the center gear, the first support member receives a rotational moment, and the first swinging gear 27 moves to the relay gear 12.
Rotate until they engage. Further, the second support member 32 is
Biasing spring 34. Due to the presence of the felt 35, rotation of the first oscillating gear 27 receives a rotational moment, and the second oscillating gear 37 rotates until it meshes with the relay gear IO. As a result, felt 38. The rotational load of the second swinging gear 37 generated by the biasing spring 39 is applied to the supply reel stand 9.
is transmitted to the tape 1, and appropriate back tension is applied to the tape 1, making it possible to perform fast-forwarding operation without causing any scattering. At this time, no load is applied to the take-up reel stand 11 on the drive side, the rotational load of the second oscillating gear 37 on the capstan motor 100 is reduced compared to the conventional case, and the biasing spring 34. Second support member 32 created by felt 35
Although the load for rotating the capstan motor 100 increases, the load on the second swing gear 37 is considerably larger due to its function, so overall the load on the capstan motor 100 decreases.

Next, the unwinding operation will be explained. In Figure 2,
When the capstan motor 100 rotates clockwise, the center gear 6 also rotates clockwise. At this time, biasing spring 3
0. Due to the presence of the felt 31, the rotation of the center gear 6 causes the first support member to receive a rotational moment, and rotates until the first swing gear 27 meshes with the relay gear 10. The second support member 32 also has a biasing spring 34 . Due to the presence of the felt 35, rotation moment is generated by the rotation of the first swinging gear 27, and the second swinging gear 37 rotates until it meshes with the relay gear 12. As a result, felt 38
．． The rotational load of the second oscillating gear 37 generated by the biasing spring 39 is transmitted to the take-up reel stand 11, and appropriate back tension is applied to the tape 1, making it possible to unwind the tape 1 without causing any loose ends. .

Next, the operation when the tape 1 is pulled out from the cassette 26, brought into contact with a rotating cylinder (not shown), and recorded/reproduced will be explained. In FIG. 3, when the tape 1 is brought into contact with the rotating cylinder (C and Z in the figure) and the loading operation is performed, the regulating member 41 is placed in the position shown in FIG.

The tape 1 is driven at a constant speed by a capstan and a pinch roller (both not shown). Because of the transmission of
The support member 32 of the biasing spring 34. Due to the presence of the felt 35, the receiver tries to rotate in the direction of the relay gear 10 due to the rotational moment, but since the restriction pin 40 is restricted by the opening 42 of the restriction member 41, the second oscillating gear 37 , it does not mesh with the relay gear 10 and does not rotate. That is, the second
The rotational load of the swing gear 37 does not act as a back tension load. For similar reasons, high-speed reverse playback (Re
vjew ), the rotational load of the second oscillating gear 37 does not act as a back tension load.

In this embodiment, a friction mechanism was used as the rotational load of the second swinging gear, but the invention is not limited to this, and a capstan motor was used as the reel stand drive motor. Needless to say, a motor may also be used.

Effect of the Invention The present invention rotates in the opposite direction to the rotating direction of the first swinging gear by the rotational force of the first swinging gear that transmits the output of the capstan motor to the reel stand, and achieves a predetermined rotation. By providing a second oscillating gear with a load, it is possible to
Back tension load mechanism (soft brake) installed on the supply side and take-up side during unwinding operation.
It has great advantages in terms of ease of assembly, cost, and weight. In addition, conventionally, the soft brake on the take-up side during fast forwarding operation and the soft brake on the supply side during unwinding operation acted as loss torque of the capstan motor, increasing power consumption, but in the present invention, the above loss torque This also has the effect of reducing power consumption.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main part of a magnetic tape device according to an embodiment of the present invention when it is performing fast forward operation, Fig. 2 is a plan view of the main part when it is also performing unwinding operation, and Fig. 3 4 is a sectional view of a main part of a magnetic tape device according to an embodiment of the present invention, and FIG. 5 is a plan view of a main part of a conventional magnetic tape device. It is. 1... Magnetic tape, 2... Supply reel, 3... Take-up reel, 6... Center gear, 27... First Swinging gear, 28...
...First support member, 37...Second swinging gear, 32...Second support member, 40...
...Regulation pin, 41...Regulation: 511 member. Name of agent: Patent attorney Toshio Nakao Haka1 person 27-・-
-Se1. Neck 3, Rigi↑ Fig. 4 C, IC7'- Kuha U-mo

Claims (1)

[Claims] a loading mechanism that attaches and detaches a magnetic tape built into a cassette to and from a cylinder; a motor that drives the magnetic tape; a supply reel stand and a take-up reel stand that respectively rotate integrally with a pair of reels in the cassette; a first neck having a rotating means driven by a motor; and a first rotating member that rotates in accordance with the rotation of the rotating means and transmits the output of the motor to the supply reel stand or the take-up reel stand; a second rotating member having a swinging means and a second rotating member that rotates in a direction opposite to the first swinging member in response to rotation of the first rotating member and has a predetermined rotational load; At the time of unloading when the swinging means and the magnetic tape are in the cassette, the second rotating member acts so as to be able to come into contact with the supply reel stand or the take-up reel stand, and the magnetic tape is in the cassette. A magnetic tape device comprising: a regulating means that prevents the second rotating member from coming into contact with the supply reel stand and the take-up reel stand during loading when pulled out from the magnetic tape device.