JP3084219U - Magnetic tape unit - Google Patents

Abstract

(57) Abstract: In a magnetic tape device, when an FF / REW mode is selected, a clutch plate can be displaced from a non-operation position to an operation position using a mode lever. SOLUTION: A clutch plate 10 displaceable between an operation position and a non-operation position is interposed between a driving pulley 1 and a driving gear 3 of an idler mechanism for switching a tape feeding direction.
The mode lever 30 is provided with an operation arm 40. FF
When the mode lever 30 moves to a position corresponding to the / REW mode, the action portion 41 of the operation arm 40 is engaged with the clutch plate 10, and the operation arm 40 is bent and deformed by the action of the cam portion 110 of the chassis 100. The operating portion 41 pushes down the clutch plate 10 to the operating position due to the bending deformation of the operation arm 40.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a magnetic tape device, and more particularly to a magnetic tape device in which a tape running mode is determined according to a position of a mode lever.

[0002]

[Prior art]

 FIG. 4 shows an idler mechanism generally employed in this type of magnetic tape device. In this idler mechanism, a driving gear 3 is supported by a rotating shaft 2 of a driving pulley 1 that is rotated by a motor (not shown). The drive gear 3 always meshes with an idle gear 5 rotatably mounted on a free end of an arm 4 swingably mounted on the rotary shaft 2. The reel shaft 6 and the take-up reel shaft 7 are separately arranged on both the left and right sides of the drive pulley, and the reel shafts 6 and 7 are provided with the reel side and the reel of a tape cassette (not shown). Each reel on the take-off side is fitted separately. Then, a delivery gear 8 is connected to the delivery reel shaft 6, and a take-up gear 9 is connected to the take-up reel shaft 7. In the idler mechanism shown in the figure, the feeding gear 8 is formed integrally with the feeding reel shaft 6, while the winding gear 9 is formed integrally with the winding reel shaft 7 via the intermediate gear 9a. It is connected to the formed gear 9b. Further, in this idler mechanism, the drive pulley 1 and the drive gear 3 are connected via a friction transmission mechanism (not shown).

According to this idler mechanism, the forward / reverse rotation of the drive pulley 1 is transmitted from the rotation shaft 2 to the drive gear 3 via the friction transmission mechanism, so that the idle gear 5 is extended in accordance with the rotation direction of the drive pulley 1. It selectively moves between a position where it meshes with the side gear 8 and a position where it meshes with the winding gear 9. When a certain load or more is applied to the drive gear 3, the rotation of the rotary shaft 2 is not transmitted to the drive gear 3 due to the action of the friction transmission mechanism, and the rotation of the drive gear 3 is stopped. The shaft 2 runs idle with respect to the drive gear 3. Such a situation occurs, for example, when the feeding or winding of the tape is completed, thereby preventing the motor for rotating and driving the driving pulley 1 from burning.

In a magnetic tape device such as a magnetic recording / reproducing device (VTR), a tape running mode is a constant speed mode (for example, REC / PLAY) in which a tape runs at a constant speed in a forward direction and a reverse direction. In addition, a fast-forward mode (for example, FF / REW) for fast-forwarding the tape in the forward and reverse directions is set. In these fast-forward modes, the drive gear 3 is directly connected to the drive pulley 1 to transmit the rotation of the drive pulley 1 to the drive gear 3 without going through the above-described friction transmission mechanism. Therefore, a switching mechanism described below is provided.

FIG. 5 shows a switching mechanism for switching between a constant speed mode and a fast forward mode employed in a conventional magnetic tape device.

In this switching mechanism, a clutch plate 10 is interposed between the drive pulley 1 and the drive gear 3 so as to be displaceable in the axial direction of the rotating shaft 2. By inserting the pin 11 into a hole (not shown) provided in the drive gear 3 so as to be slidable, the rotation of the clutch plate 10 can be constantly transmitted to the drive gear 3. Further, the clutch plate 10 and the driving pulley 1 are provided with respective tooth portions 12 and 13 which can be engaged with each other, and when the clutch plate 10 is displaced in a direction approaching the driving pulley 1, the tooth portions 12 and 13 are displaced. , 13 mesh with each other, and the rotation of the driving pulley 1 is transmitted to the driving gear 3 via the clutch plate 10 by the meshing.

Further, a spring 14 for constantly biasing the clutch plate 10 toward the drive gear 3 is interposed between the drive pulley 1 and the clutch plate 10. At a contact point between the spring 14 and the clutch plate 10, the spring 14 can slide on the clutch plate 10 and rotate when the load applied to the drive gear 3 exceeds a certain level. Moreover, in the switching mechanism of the illustrated example, when the tooth portion 12 of the clutch plate 10 is separated from the tooth portion 13 of the drive pulley 1 and the load applied to the drive gear 3 is equal to or less than a predetermined value, the rotation of the drive pulley 1 is controlled by the spring 14. Through the clutch plate 10. Therefore, the above-described friction transmission mechanism is constituted by the spring 14.

The switching mechanism includes an operation arm 20 supported by the shaft body 15 so as to be vertically swingable. The operating arm 20 has an operating portion 22 at the tip thereof, and the operating portion 22 is always engaged with the clutch plate 10 in the vertical direction. Further, the operating arm 20 is provided integrally with an elastic piece 23 extending backward and a sliding part 24. Since the elastic piece 23 represses the chassis 100, its elasticity is increased. The action portion 22 is constantly biased toward the illustrated initial position by the elasticity of the piece portion 23. A convex cam portion 31 provided on the mode lever 30 faces the sliding portion 24. The mode lever 30 is provided so as to be movable in a direction orthogonal to the axis of the rotating shaft 2 of the driving pulley 1. Then, a tape running mode corresponding to the position of the mode lever 30 can be obtained.

In the switching mechanism described with reference to FIG. 5, when the mode lever 30 moves in the direction of the arrow a and the sliding portion 24 of the operation arm 20 rides on the cam portion 31, the operation arm 20 moves around the shaft 15. By swinging, the clutch plate 10 in which the action portion 22 is in the non-operation position is displaced in a direction approaching the drive pulley 1. As a result, the teeth 12 of the clutch plate 10 mesh with the teeth 13 of the drive pulley 1, and the clutch plate 10 is located at the operating position. For this reason, the drive gear 3 is directly connected to the drive pulley 1 via the clutch plate 10, and the rotation of the drive pulley 1 is transmitted to the drive gear 3 without via the above-described friction transmission mechanism.

On the other hand, Japanese Patent Application Laid-Open No. 61-99960 describes a tape running mode switching mechanism provided with a friction transmitting mechanism.

[0011]

[Problems to be solved by the invention]

 The conventional magnetic tape device having the switching mechanism described with reference to FIG. 5 uses the elastic piece 23 and the sliding portion 24 to displace the clutch plate 10 from the non-operation position to the operation position in accordance with the fast-forward mode. Since the operation arm 20 is used as a component having the above structure, not only does the cost of the parts increase, but also the process of assembling the operation arm 20 becomes extra.

The present invention has been made in view of the above-described problems, and omits the operation arm 20 described with reference to FIG. 5 and, without using a separate component instead of the operation arm 20, does not use the clutch plate of the above-described switching mechanism. An object of the present invention is to provide a magnetic tape device that can be displaced from an operating position to an operating position, thereby reducing the number of components and easily reducing costs.

Another object of the present invention is to provide a magnetic tape device using a mode lever as a member for displacing a clutch plate of the above-mentioned switching mechanism from a non-operation position to an operation position.

[0014]

[Means for Solving the Problems]

 In the magnetic tape device according to the present invention, the winding shaft that constantly meshes with the rotating shaft of the driving pulley and transmits the idle gear to the drawing-out reel shaft while transmitting the rotation to the drawing-out reel shaft. A driving gear, which selectively meshes with the take-off gear, is connected via a friction transmission mechanism, and an operating position between the driving pulley and the driving gear, which directly connects the driving gear to the driving pulley, and a driving gear. A clutch plate that can be displaced in the axial direction of the rotary shaft between a non-operating position that is not directly connected to the drive pulley and a mode lever that is used for switching the tape running mode is provided in the axial direction of the rotary shaft. It is arranged so as to be movable in a direction orthogonal to the direction. This configuration is provided as it is in the conventional magnetic tape device described with reference to FIGS.

In the present invention, the mode lever is integrally provided with an operation arm for displacing the clutch plate from the non-operation position to the operation position by moving the mode lever. With this configuration, the operation arm 20 described with reference to FIG. 5 is unnecessary, and the mode lever which is indispensable for switching the stopper traveling mode is used without using a separate component instead of the operation arm 20 of FIG. As a result, the clutch plate can be displaced from the non-operation position to the operation position.

In the present invention, the clutch plate has a pair of engaging portions facing each other in the axial direction of the rotating shaft, and a pair of the engaging portions is provided at the distal end of the operation arm by movement of the mode lever. When the operating portion is fitted between the pair of engaging portions, the clutch plate is not operated via the operating portion when the operating portion is fitted between the pair of engaging portions. It is possible to adopt a configuration in which a cam portion for bending and deforming the operation arm is provided on the fixed side member so as to be pressed and displaced from the position to the operation position. Then, it is possible to use a chassis as the fixed side member. Preferably, each of the pair of engaging portions is a disk. Furthermore, it is possible to adopt a configuration in which the tape running mode when the operation arm displaces the clutch plate from the non-operation position to the operation position is a fast-forward mode in a forward direction and a reverse direction.

In the present invention, the idler gear always meshes with the rotating shaft of the driving pulley, and the idle gear transmits the rotation to the reeling reel shaft, and the winding side which transmits the rotation to the winding reel shaft. A drive gear, which is selectively engaged with the gear, is connected via a friction transmission mechanism, and between the drive pulley and the drive gear, an operation position where the drive gear is directly connected to the drive pulley and the drive gear are driven. A clutch plate that can be displaced in the axial direction of the rotating shaft is interposed between a non-operating position that is not directly connected to the pulley, and a mode lever that is used for switching the tape running mode is disposed in the axial direction of the rotating shaft. In a magnetic tape device arranged so as to be movable in a direction perpendicular to the magnetic tape device, the clutch plate has a pair of disk-shaped engaging portions opposed to each other in the axial direction of the rotating shaft. An operation arm is integrally provided with the mode lever, and when the mode lever is moved to a position corresponding to a fast-forward mode in a forward direction and a reverse direction among a plurality of tape running modes at the tip of the operation arm. When the mode lever is moved to a position corresponding to a tape running mode other than the fast-forward mode, the pair of engaging portions is positioned at a position where the pair of engaging portions are fitted to each other. An action portion is provided at a position separated from the space, and the action portion is fitted between the pair of engagement portions on both sides sandwiching the axis of the clutch plate. When the operating portion is fitted between the pair of engaging portions, the clutch plate is pressed and displaced from the non-operating position to the operating position via the operating portion. Up Operations that have cam portion for the arm is resiliently deformed is provided in the chassis, it is possible to adopt a configuration that.

The operation achieved by adopting this configuration will be described in detail in the following description of embodiments.

[0019]

[Embodiment of the invention]

 FIG. 1 is a schematic side view of a main part of a magnetic tape device according to an embodiment of the present invention in a constant speed mode, FIG. 2 is a schematic side view of a main part in the fast-forward mode, and FIG. It is a top view.

FIG. 1 and FIG. 2 show a switching mechanism for switching between a constant speed mode and a fast forward mode. In this switching mechanism, a clutch plate 10 is interposed between the drive pulley 1 and the drive gear 3 so as to be displaceable in the axial direction of the rotating shaft 2, and a plurality of pins 11 provided on the clutch plate 10 are provided. The rotation of the clutch plate 10 can be constantly transmitted to the drive gear 3 by being slidably inserted into a hole (not shown) provided in the drive gear 3. The clutch plate 10 has a pair of disk-shaped engaging portions 15 and 16 that face each other in the axial direction of the rotating shaft 2. The clutch plate 10 and the driving pulley 1 are provided with tooth portions 12 and 13 which can be engaged with each other, and the clutch plate 10 is displaced in a direction approaching the driving pulley 1 and located at the operating position. As a result, the teeth 12 and 13 mesh with each other, and the rotation of the drive pulley 1 is transmitted to the drive gear 3 via the clutch plate 10 by the meshing.

Further, a spring 14 constituting a friction transmission mechanism is interposed between the drive pulley 1 and the clutch plate 10, and a driving gear 3 is provided at a contact point between the spring 14 and the clutch plate 10. When the applied load exceeds a certain level, the spring 14 slides on the clutch plate 10 and can rotate. When the teeth 12 of the clutch plate 10 are separated from the teeth 13 of the drive pulley 1 and the load applied to the drive gear 3 is equal to or less than a predetermined value, the rotation of the drive pulley 1 is It is transmitted to the plate 10.

The matters described above are the same as those of the switching mechanism described with reference to FIG.

In this embodiment, as shown in FIG. 3, an operation arm 40 is provided integrally with the mode lever 30, and an operating portion 41 is provided at a distal end of the operation arm 40. An angled convex portion 42 is integrally provided at an intermediate portion of 40. . In the illustrated example, the operating arm 40 is formed by being divided into a pair of projecting portions 40a, 40a parallel to each other, and the operating portion 41, 41 provided in each of the projecting portions 40a, 40a is divided into two. Faces the space between the pair of disc-shaped engaging portions 15 and 16 of the clutch plate 10. The mode lever 30 is used for switching between a plurality of tape running modes such as a forward or reverse constant speed mode or a forward or reverse fast forward mode, and is provided with respect to the axial direction of the rotating shaft 2 of the driving pulley 1. It is arranged to be movable in a direction X orthogonal to the direction X.

When the mode lever 30 moves to a position corresponding to the fast forward mode in the forward direction and the reverse direction in the tape running mode, the mode lever 30 acts between the pair of engaging portions 15 and 16 of the clutch plate 10. When the mode lever 30 is moved to a position corresponding to the other tape running mode when the portions 41, 41 are fitted, the action portions 41, 41 are interposed between the pair of engagement portions 15, 16 of the clutch plate 10. 41 is located at the place where it has left. Moreover, the action portions 41, 41 fitted between the pair of engagement portions 15, 16 of the clutch plate 10 are located on both sides of the axis of the clutch plate 10.

On the other hand, as shown in FIG. 1 or FIG. 2, the chassis 100 is provided with a convex cam portion 110, and the action portion 41 is engaged with the pair of engaging plates of the clutch plate 10 as described above. When the parts 15 and 16 are fitted between each other, as shown in FIG. 2, the convex part 42 of the operation arm 40 rides on the cam part 110 and pushes the operation arm 40 against its own elasticity. The clutch plate is pressed and displaced from the non-operation position in FIG. 1 to the operation position in FIG. As a result, the tooth portion 12 of the clutch plate 10 meshes with the tooth portion 13 of the drive pulley 1, so that the drive gear 3 is directly connected to the drive pulley 1 via the clutch plate 10, and the drive pulley does not go through the above-described friction transmission mechanism. One rotation is transmitted to the drive gear 3.

When the mode lever 30 is located at a position corresponding to the tape running mode other than the fast forward mode in the forward direction and the reverse direction, the operation is performed between the pair of engaging portions 15, 16 of the clutch plate 10. Since the portion 41 is located at the position where the clutch plate 10 is detached, the clutch plate 10 is displaced to the inoperative position by the spring 14 as shown in FIG. Therefore, the rotation of the drive pulley 1 is transmitted to the drive gear 3 via a friction transmission mechanism formed on the spring 14.

In this embodiment, the action portions 41, 41 fitted between the pair of engagement portions 15, 16 of the clutch plate 10 are located on both sides of the axis of the clutch plate 10. Therefore, when the convex portion 42 of the operation arm 40 rides on the cam portion 110 and the action portion 41 pushes the clutch plate from the non-operation position in FIG. 1 to the operation position in FIG. And the displacement of the clutch plate 10 from the non-operation position to the operation position is performed smoothly.

In this embodiment, although the cam portion 110 is provided on the chassis 100, the cam portion 110 may be provided on a fixed member other than the chassis.

The idler mechanism described with reference to FIG. 4 is also employed in the magnetic tape device of this embodiment.

In FIGS. 1 to 5, the same or corresponding parts are denoted by the same reference numerals.

[0031]

[Effect of the invention]

 As described above, according to the present invention, by utilizing the mode lever, the operation arm 20 described with reference to FIG. 5 can be omitted, and the clutch plate can be non-operated without using another separate component. Since it can be displaced from the position to the operating position, the number of parts and the number of assembling steps are reduced, making it easier to reduce costs.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a main part of a magnetic tape device according to an embodiment of the present invention in a constant speed mode.

FIG. 2 is a schematic side view of a main part in the fast-forward mode.

FIG. 3 is a schematic plan view of the main part.

FIG. 4 is an explanatory diagram of an idler mechanism.

FIG. 5 is a schematic side view of a main part of a conventional magnetic tape device in a constant speed mode.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drive pulley 2 rotation shaft 3 drive gear 5 idle gear 6 feed-out reel shaft 7 take-up reel shaft 8 feed-out gear 9 take-up gear 10 clutch plate 14 spring (friction transmission mechanism) 15, 16 engaging portion 30 mode Lever 40 Operation arm 41 Working part 110 Cam part

Claims (6)

[Utility model registration claims] A take-up gear that constantly meshes with an idle gear on the rotating shaft of the drive pulley and transmits the idle gear to a pay-out reel shaft; and a take-up gear that transmits rotation to a take-up reel shaft. A drive gear, which meshes with the drive pulley, is connected via a friction transmission mechanism, and an operating position where the drive gear is directly connected to the drive pulley and the drive gear is directly connected to the drive pulley between the drive pulley and the drive gear. A clutch plate that is displaceable in the axial direction of the rotating shaft between the non-operating position and a mode lever used for switching the tape running mode, in a direction orthogonal to the axial direction of the rotating shaft. The clutch plate has a pair of disk-shaped engaging portions opposed to each other in the axial direction of the rotating shaft, and the mode lever is provided on the mode lever. When the mode lever is moved to a position corresponding to a fast forward mode in a forward direction and a reverse direction among a plurality of tape running modes at a tip portion of the operation arm, a pair of the engaging members are provided. A position that is located at a position fitted between the mating portions and that is separated from a space between the pair of engaging portions when the mode lever is moved to a position corresponding to the tape running mode other than the fast-forward mode. Is provided, and this working part is
The clutch plate is divided into two portions that fit between the pair of engaging portions on both sides of the axis of the clutch plate, and the operating portion is fitted between the pair of engaging portions. A magnetic tape device, characterized in that a cam portion for flexing and deforming the operation arm so as to press and displace the clutch plate from the non-operation position to the operation position via the action portion is provided on the chassis. And a take-up gear that constantly meshes with an idle gear and transmits rotation of the idle gear to a pay-out reel shaft, and a take-up gear that transmits rotation to a take-up reel shaft. A drive gear, which meshes with the drive pulley, is connected via a friction transmission mechanism, and an operating position where the drive gear is directly connected to the drive pulley and the drive gear is directly connected to the drive pulley between the drive pulley and the drive gear. A clutch plate that is displaceable in the axial direction of the rotating shaft between the non-operating position and a mode lever used for switching the tape running mode, in a direction orthogonal to the axial direction of the rotating shaft. A magnetic tape device that is movably disposed on the mode lever, wherein the mode plate is moved from the non-operation position to the operation position by movement of the mode lever. Tape drives that the operating arm for causing is characterized in that it is provided integrally. 3. The clutch plate has a pair of engaging portions opposed to each other in the axial direction of the rotating shaft, and a pair of the engaging portions is provided at a tip end of the operating arm by movement of the mode lever. An actuating portion that can be fitted to and disengaged from the space, and when the acting portion is fitted between the pair of engaging portions, the clutch plate is moved from the non-operation position via the acting portion. 3. The magnetic tape device according to claim 2, wherein a cam portion for bending and deforming the operation arm so as to be pressed and displaced to the operation position is provided on the fixed member. 4. The magnetic tape device according to claim 3, wherein the fixed-side member is a chassis. 5. The magnetic tape device according to claim 3, wherein each of the pair of engaging portions is a disk. 6. The tape running mode when the operation arm displaces the clutch plate from a non-operation position to an operation position is a fast-forward mode in a forward direction and a reverse direction. The magnetic tape device described in the above.