JP3095680U - Magnetic tape unit - Google Patents

Abstract

(57) Abstract: In a magnetic tape device, an overlap width between a claw piece and a guide edge of a chassis is enlarged to prevent tilting of an idle gear. Easily attach the swing arm to the chassis or spindle. A swing arm (3) having an idle gear (4) and a shaft hole (32) fitted to a support shaft (2) is provided. The shaft hole 32 of the swing arm 3 is provided with a split groove 37, and the shaft hole 32 is fitted to the support shaft 2 from the radial direction by using the split groove 37. By extending the width of the claw piece 34, the overlap width D between the claw piece 34 and the guide edge 12 of the chassis 1 is increased. The chassis 1 is sandwiched between the claw pieces 34 and the main part 31.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention is directed to a magnetic tape device, especially to the left by the so-called swinging motion of idle gears. For magnetic tape devices that are designed to switch the transmission of rotation to the right reel stand. To do.

[0002]

[Prior art]

  FIG. 6 shows a main part of a conventional magnetic tape device. In the figure, 1 is a shear Reference numeral 2 denotes a support shaft vertically fixed to the chassis 1, and the support shaft 2 has a plate of the swing arm 3. A shaft hole portion 32 provided at one end of the piece-shaped main portion 31 is swingably fitted. . Further, the other end of the main part 31 is provided with a hook part 33, and the end part of the hook part 33 is provided. The provided claw piece 34 is an arc-shaped guide edge portion 12 provided on the chassis 1. It is slidably locked in an overlapping shape. Then, from the main portion 31 and the hook portion 33 The chassis 1 is sandwiched by the claw pieces 34 protruding toward one end of the main portion 31. Has been. Further, the idle gear 4 is attached to the shaft 35 provided at the other end of the swing arm 3. Is rotatably fitted. This idle gear 4 is not shown in FIG. It constantly meshes with the drive-side gear and revolves in the forward and reverse directions around the drive-side gear. You That is, the drive side gear is rotatably attached to the support shaft 2 and When the gear rotates in the positive direction (clockwise), the idle gear 4 rotates counterclockwise. While the swinging arm 3 swings, the drive side gear is rotated in the forward direction (clockwise). The drive-side gear rotates in the opposite direction (counterclockwise) while it revolves around Then, the idle gear 4 rotates clockwise and the swinging motion of the swinging arm 3 is accompanied. Then, it revolves around the drive gear in the opposite direction (counterclockwise) (pivot motion).

[0003]   On the other hand, in the magnetic tape device, the left and right reel stands ( Gears interlocking with each other (not shown) are separately provided. And the idle gear 4 is up When revolving in the forward or reverse direction as described above, the idle gear 4 is Selectively mesh with each of the different gears that are linked to the stand, and rotate to either the left or right reel stand. The rotation is transmitted.

[0004]   In this magnetic tape device, the hook portion 33 has the claw piece 34 of the chassis 1 It is locked to the id edge portion 12 and serves to regulate the height position of the idle gear 4. It Therefore, when the claw piece 34 is always properly engaged with the guide edge portion 12, When the idle gear 4 is designed to swing, Rotation is reliably transmitted to either the left or right gear, and magnetic tape running stability Is maintained.

[0005]   As a prior example, we have proposed a structure to attach an idle gear to the swing arm. There is (for example, refer to Patent Document 1). As another precedent example, the rotation is transmitted to the idle gear. To ensure that the clutch mechanism of the clutch mechanism that is provided to reach Some of them have been proposed (for example, see Patent Document 2). In yet another precedent, Lee Control of the center-to-center distance of each gear when the gearbox is driven by a gear train. A proposal has been made to make it easier (for example, see Patent Document 3). In yet another precedent Is the coupling gear in the clutch for driving the reel stand of the VCR. A structure has been proposed to suppress the disengagement from the idler gear (for example, For example, see Patent Document 4).

[0006]

[Patent Document 1]   JP, 2002-197750, A

[Patent Document 2]   Utility model registration No. 3050549

[Patent Document 3]   JP-A-56-130848

[Patent Document 4]   JP, 2001-307397, A

[0007]

[Problems to be solved by the device]   In the conventional magnetic tape device described in FIG. 6, the swing arm 3 is made of synthetic resin. When the body is molded, the main portion 31 is formed into a plate piece shape, and therefore is relatively flexible. Sui. In addition, when attaching the swing arm 3 to the support shaft 2 or the chassis 1, Insert the shaft hole portion 31 from the end of the support shaft 2 as shown by the phantom line, and insert it as shown by the arrow a. In addition to riding, guide the hooks 33 to the claw pieces 34 while bending them. The edge 12 is overridden and locked to the guide edge 12 as shown. for that reason To increase the protrusion width of the claw piece 34 to increase the overlapping width D with the guide edge portion 12. When the claw piece 34 crosses over the guide edge portion 12, the overlapping width D is limited. It could not be increased so much due to the bending width of the hook portion 32 of . Therefore, there is no reaction force due to vibration or meshing rotation between the idle gear 4 and other gears. Under some influences, the claw piece 34 is about to come off the guide edge portion 12, and abnormal noise is generated. There was a problem. This problem is caused by the technique disclosed in each of the above-mentioned prior examples. It cannot be solved by the technique.

[0008]   The present invention has been made in view of the above problems, and has a very simple structure and is new. Widen the overlap width of the claw piece with the guide edge of the chassis without adding additional parts. It is possible to make it big, and it is due to the claw piece coming off from the guide edge Eliminates the generation of abnormal noise and allows the rotation transmission from the idle gear to either the left or right gear. Tape device that can reliably maintain the running stability of the magnetic tape The purpose is to provide.

[0009]

[Means for Solving the Problems]

  The magnetic tape device according to the present invention swings around a support shaft of a drive gear. The drive arm always meshes with the drive-side gear and rotates in the forward and reverse directions around the drive-side gear. Is equipped with an idle gear that revolves around the It is designed so that it selectively engages with different gears that interlock with the left and right reel bases. In both cases, the swing arm is attached to one end and the other end of the plate-shaped main portion, and to the support shaft. It is slidable between the shaft hole that is fitted to swing and the guide edge that is equipped on the chassis. It has a hook that locks in an overlapping shape and controls the height position of the idle gear. In the magnetic tape device, each of which includes a hook portion and a hook portion, From the above toward the one end side of the main part of the swing arm, and the extension width of the claw piece is extended. The width of the overlap between the claw piece and the guide edge is enlarged, and the shaft hole is At the one end of the main portion of the shaft edge portion of the main body in the radial direction on the support shaft. It has a long hole that can be plugged in.

[0010]   With this structure, the shaft hole is supported using the long hole provided in the swing arm. It becomes possible to fit it in the shaft from the radial direction, and when doing so, the hook part Since the tabs of the slide on the guide edge of the chassis When attaching the hook, bend the hook and There is no need to let them do it. Therefore, increase the protrusion width of the claw piece It becomes possible to secure a sufficiently large overlap width, and vibration and idle gears and other If the claw pieces come off the guide edge due to the reaction force from the meshing rotation of the It prevents the occurrence of abnormal noise.

[0011]   In the present invention, the support shaft is fixed to the chassis, and the chassis is made of synthetic resin. The main parts of the swinging arms, which are in the form of shapes, slidably overlap each other, and their chassis Is preferably sandwiched between the swing arm and the hook piece of the hook portion. . According to this, it is possible to slide the main part of the swing arm on the chassis. By simply inserting the shaft hole in the support shaft from the Will slide on the chassis at the edge of the guide and will be superimposed.

[0012]   In the present invention, the width of the elongated hole is not shorter than the inner diameter of the shaft hole. The idle gear is engaged with one of the left and right reel bases and rotates. The reaction force applied to the idle gear when transmitting the rolling force causes the swing arm to move. It is desirable that the shaft hole portion be pressed against the support shaft. By this Therefore, even if the shaft hole has a long hole, the shaft hole is not positioned with respect to the spindle. The situation that it does not occur does not occur.

[0013]   The magnetic tape device according to the present invention is further improved by adopting the following configuration. Be embodied. In other words, the swing arm that swings around the driving shaft of the drive gear , Always meshes with the drive gear and revolves in the forward and reverse directions around the drive gear. Equipped with an idle gear that moves to the left and right by revolving in the forward and reverse directions. It is designed to selectively mesh with each different gear that is linked to A swing arm is swingably attached to the support shaft at one end and the other end of the plate-shaped main portion. Slidingly overlaps the fitted shaft hole and the guide edge provided on the chassis. A hook portion that has a claw piece that is locked and that regulates the height position of the idle gear; In the magnetic tape device provided separately, the spindle is fixed to the chassis. , The main part of the swing arm made of a synthetic resin molded body is placed on the chassis so that it can swing freely. The chassis and the chassis toward the main part and one end of the main part. It is sandwiched by the claw pieces protruding from the hook portion, and Open at the end edge of the main part at the hole edge part on the one end side of the main part and use the shaft hole part as the support shaft. It has a split groove that can be fitted from the radial direction, and the hook of the hook The protruding width of one piece is extended to increase the overlapping width of the claw piece and the guide edge part. The groove width of any part of the notch groove in the longitudinal direction is the same as the inner diameter of the shaft hole. Yes, the idle gear meshes with either the left or right reel stand to transmit rotation. The shaft force of the rocking arm is raised by the reaction force applied to the idle gear when It is designed so that it can be pressed against the spindle, and the drive-side gear is It consists of the output gear of the clutch mechanism interposed between the idle gear and its output teeth. The circular recess provided in the center of rotation of the car was projected into the shaft hole of the swing arm. It is further embodied by adopting the structure that the boss part is fitted. It The operation exerted by this invention will be described with reference to the following embodiments.

[0014]

[Embodiment of device]

  FIG. 1 is a plan view illustrating a main part of a magnetic tape device according to an embodiment of the present invention. 2 is a plan view of the swing arm, and FIG. 3 is an enlarged view of a portion along the line III-III in FIG. 4 is a schematic sectional view showing the procedure for attaching the swing arm, and FIG. It is a partial top view of the rocking arm by a form example.

[0015]   In FIG. 1, reference numeral 1 is a chassis, and 2 is a support shaft projecting vertically downward from the chassis 1. is there. The output side gear 6 of the clutch mechanism is rotatably attached to the support shaft 1 as shown in FIG. The idle gear 4 which is always engaged with the output side gear 6 is It is provided on a swing arm 3 which is swingably attached to a shaft 1. Also an idol Left and right reel stands 7 and 8 are provided on both sides of the gear 4 and the reel stands 7 and 8 are arranged. The gears 71 and 81 are provided in the. Also, an intermediate gear train for one gear 81 82 meshes with each other, and the start gear 83 of the intermediate gear train 82 sandwiches the idle gear 4. It faces the gear 71 on the other side. Then, the output side gear 6 shown in FIG. 3 rotates. And the idle gear 4 rotates in the direction opposite to that of the output gear 6 while the output gear rotates. It revolves in the direction of rotation of 6. Therefore, the output side gear 6 rotates normally. When the idle gear 4 rotates in the direction of arrow a, Accordingly, the output gear 6 is revolved in the direction of arrow X (pivoting motion), and The idle gear 4 meshes with the gear 83 and the rotation is transmitted to the gear 81 on one side. The table 8 is rotationally driven in the direction of arrow A. On the other hand, if the output side gear 6 reverses When the idle gear 4 normally rotates in the direction of arrow b, the swinging motion of the swinging arm 3 is accompanied. And revolves around the output-side gear 6 in the direction of the arrow Y (pivoting motion), whereby the eye The dollar gear 4 meshes with the gear 71 and the rotation is transmitted to the gear 71. Is driven to rotate in the direction of arrow B. In the magnetic tape device, the reel base 8 is driven to rotate. It is moved in the magnetic tape progressive mode, and the reel base 7 is driven to rotate. This is done in the reverse feeding mode of the magnetic tape.

[0016]   As shown in FIG. 2 or FIG. 3, the swing arm 3 is made of a synthetic resin integrally molded, and has a plate-like shape. Main part 31, a shaft hole 32 provided at one end of the main part 31, and the main part 31 The hook portion 33 and the shaft 35 provided at the other end of the The dollar gear 4 is fitted so as to be slidably rotatable. Further, the shaft hole portion 32 is attached to the support shaft 2. It is fitted so as to be swingable, and the main portion 31 is superposed on the chassis 1, In addition, the claw piece 34 protruding from the end of the hook portion 33 is provided on the chassis 1. It is superposed on the arc-shaped guide edge portion 12. Moreover, the chassis 1 has a main part 3 It is sandwiched by 1 and the claw piece 34 so as to be slidable relative to each other. Furthermore, the output side The gear 6 is provided with a flange portion 61, and the flange portion 61 is provided on the outer peripheral portion of the idle gear 4. Prevent the idle gear 4 from slipping off the shaft 35 by slidingly overlapping. There is. The output side gear 6 is biased by a coil spring (not shown), The urging force presses the collar portion 61 against the outer peripheral portion of the idle gear 4.

[0017]   As shown in FIG. 1 or 2, the shaft hole portion 32 of the main portion 31 surrounds the shaft hole portion 32. The boss portion 36 is provided in an open form, and the shaft hole portion 32 is provided at one position in the circumferential direction. A split groove 37 is provided. The split groove 37 in the illustrated example is formed in the main portion 31 of the shaft hole portion 32. It is provided at the edge of the hole on the one end side and opens at the edge of the main portion 31. Also, The split groove 37 is a groove that allows the shaft hole portion 32 to be fitted into the support shaft 2 in the radial direction. 2 has a width, and in the case of FIG. 2, its groove width is the dimension of any part of its longitudinal direction. It is formed to have the same inner diameter dimension as the shaft hole portion 32. On the other hand, the foot shown in FIG. The protrusion width of the claw piece 34 of the hook portion 33 is the same as that of the hook portion 33 of the conventional claw piece 34 described in FIG. It is longer than the width of these. Therefore, in this embodiment, the claw piece 34 and the chassis The overlapping width D with the guide edge portion 12 of 1 is wider than the conventional overlapping width D described in FIG. It has been great.

[0018]   Further, as can be seen in FIG. 3, the boss portion 36 is located at the center of rotation of the output gear 6. It fits into the circular recess 61 provided. Therefore, the support shaft 2 and the output side gear 6 are Therefore, the rotation position of the boss portion 36 is restricted to a fixed position.

[0019]   In this embodiment, the split groove 37 attaches the swing arm 3 to the support shaft 2 and the chassis 1. It will be necessary for the attachment work. That is, when the swing arm 3 is attached, The main part 31 of the swing arm 3 on the chassis 1 as shown by the arrow X. When slid, the support shaft 2 fits into the shaft hole 32 through the split groove 37, and Through the work, the claw piece 34 slides on the guide edge portion 12 of the chassis 1 and is overlapped. To be done. Since such a mounting procedure can be adopted, the protrusion width of the claw piece 34 can be reduced. Even if it is extended and the overlapping width D with the guide edge portion 12 is enlarged, the swing arm 3 can be attached. It can be done easily and easily.

[0020]   With the configuration described with reference to FIG. 1 or 3, the chassis 1 has the main part 3 of the swing arm 3. 1 and the claw piece 34 are relatively slidably sandwiched between the claw piece 34 and the claw piece 34. Because the overlapping width D of the chassis 1 with the guide edge 12 is wider than before , Not only the swing arm 3 swings accurately horizontally about the support shaft 2, but also the idle When the gear 4 receives vibration or reaction force while rotating by meshing with the gear 71 or the gear 83. Even when the idle gear is engaged, the claw piece 34 is about to come off the guide edge 12 of the chassis 1. It is possible to prevent tilting of 4 and noise.

[0021]   Further, when the idle gear 4 meshes with the gear 71 and the gear 83 to rotate, The direction of the reaction force applied to the idle gear 4 during the meshing rotation is shown by the arrow F in FIG. Direction, that is, the direction in which the shaft hole portion 32 of the swing arm 3 is pressed against the support shaft 2. Therefore, even if the split groove 37 is formed in the shaft hole portion 32, the shaft hole portion 32 does not There is a situation in which it may come out of the groove through the split groove 37 or cause rattling. It doesn't come Furthermore, in this embodiment, the boss portion 36 of the shaft hole portion 32 is as shown in FIG. Is fitted into the circular recess 61 of the output side gear 6, and the rotational position of the boss portion 36 is restricted to a fixed position. Therefore, the shaft hole portion 32 comes out from the support shaft 2 through the split groove 37. Nothing can happen.

[0022]   In this embodiment, the groove width of the dividing groove 37 is determined by which portion in the longitudinal direction of the dividing groove 37. However, although its size is made to be the same as the inner diameter of the shaft hole 32, For example, as shown in FIG. 5, the groove width dimension is smaller than the inner diameter dimension of the shaft hole portion 32. Even if it is made hollow, the shaft hole portion 32 can be fitted to the support shaft 2 from the radial direction through the split groove 37. Anything that can be done is acceptable.

[0023]   In this embodiment, the drive gear that meshes with the idle gear 4 is the clutch. Although the output gear 6 of the mechanism is exemplified, this drive gear is the output tooth. It does not necessarily have to be the car 6. In addition, the shaft hole 32 is split in one position in the circumferential direction. Although the case where the groove 37 is provided has been described, the split groove 37 is replaced with a long hole. It is also possible to do so, and in such a case, after inserting the long hole into the spindle 2, The main part 31 of the moving arm 3 is superposed on the chassis 1 and slid as shown by an arrow X in FIG. Then, the support shaft 2 is fitted into the shaft hole portion 32 through the long hole, and through this work, The claw pieces 34 slide on the guide edge portion 12 of the chassis 1 and are overlapped with each other.

[0024]

[Effect of device]

  As described above, according to the present invention, the split groove is formed in the shaft hole of the swing arm. Despite its extremely simple structure, the tab between the tab and the guide edge of the chassis The overlapping width can be expanded to prevent the idle gear from tilting, and moreover The chassis can be easily attached to the chassis or spindle. Therefore , The nail piece may come off the guide edge without increasing the number of parts. It is possible to eliminate the generation of abnormal noise due to the noise. Rotation is reliably transmitted to either the right or left gear of the magnetic tape to stabilize the running of the magnetic tape. You will be able to maintain your sex.

[Brief description of drawings]

FIG. 1 is a plan view illustrating a main part of a magnetic tape device according to an embodiment of the present invention.

FIG. 2 is a plan view of a swing arm.

3 is an enlarged schematic cross-sectional view of a portion along line III-III in FIG.

FIG. 4 is a schematic cross-sectional view showing a procedure for attaching a swing arm.

FIG. 5 is a partial plan view of a swing arm according to a modification.

FIG. 6 is a schematic sectional view of a main part of a conventional example.

[Explanation of symbols]

1 chassis 2 spindles 3 swing arm 4 idle gear 6 Output side gear (drive side gear) 12 Guide edge 31 Main part 32 shaft hole 33 Hook part 34 nail pieces 36 Boss 37 Split groove (long hole) 61 circular recess 71,83 gears D Overlap width of the claw piece and the edge of the guide

Claims (4)

[Scope of utility model registration request] 1. An oscillating arm that oscillates about a support shaft of a drive-side gear is provided with an idle gear that constantly meshes with the drive-side gear and revolves in the forward and reverse directions around the drive-side gear, The idle gear is adapted to selectively mesh with each of the different gears interlocking with the left and right reel bases by revolving in the forward and reverse directions, and the swing arm has one end of its plate-shaped main portion. And a shaft hole portion swingably fitted to the support shaft, and a claw piece slidably locked to a guide edge portion provided on the chassis in an overlapping manner at the other end portion. In a magnetic tape device separately provided with a hook portion that regulates the height position of the idle gear, the main shaft of the swing arm formed of a synthetic resin molding is fixed to the chassis with the support shaft fixed to the chassis. The parts are swingably overlapped and the chassis It is sandwiched by the main portion and the claw piece protruding from the hook portion toward one end side of the main portion, and the main portion is provided at the hole edge portion on the one end side of the main portion in the shaft hole portion. With a split groove that is open at the end edge of the part and that allows the shaft hole part to be fitted in the support shaft in the radial direction,
The protrusion width of the claw piece of the hook portion is extended to increase the overlapping width of the claw piece and the guide edge portion. The inner diameter of the rocking arm is the same as that of the idle gear, and the reaction force applied to the idle gear when the idle gear meshes with either the left or right reel base to transmit the rotation causes the shaft hole portion of the swing arm to move to the spindle. The drive side gear is an output side gear of the clutch mechanism interposed between the motor and the idle gear, and is a circular recess provided in the center of rotation of the output side gear. A magnetic tape device characterized in that a boss portion projecting into a shaft hole portion of the swing arm is fitted to the. 2. An oscillating arm that oscillates around a drive shaft of a drive gear is provided with an idle gear that constantly meshes with the drive gear and revolves in the forward and reverse directions around the drive gear. The idle gear is configured to selectively mesh with each of the different gears interlocking with the left and right reel bases by revolving in the forward and reverse directions, and the swing arm has one end of its plate-shaped main portion. And a shaft hole portion swingably fitted to the support shaft, and a claw piece slidably locked to a guide edge portion provided on the chassis in an overlapping manner at the other end portion. In a magnetic tape device separately provided with a hook portion that regulates the height position of the idle gear, the claw piece is projected from the hook portion toward one end side of the main portion of the swing arm, Extend the protruding width of the claw piece so that the claw piece and the guide edge part overlap. The width is enlarged, and a long hole is provided at a hole edge portion on the one end side of the main portion of the shaft hole portion so that the shaft hole portion can be radially fitted to the support shaft. And a magnetic tape device. 3. The supporting shaft is fixed to the chassis, the main part of the swing arm made of a synthetic resin molding is slidably overlapped on the chassis, and the chassis is the swing arm and the hook. The magnetic tape device according to claim 3, wherein the magnetic tape device is sandwiched by a claw piece of the portion. 4. The width dimension of the elongated hole is set to a dimension not shorter than the inner diameter dimension of the shaft hole portion, and when the idle gear meshes with one of the left and right reel stands to transmit rotation. By the reaction force applied to the idle gear,
4. The magnetic tape device according to claim 2, wherein a shaft hole portion of the swing arm is pressed against the support shaft.