JP3089576U - Magnetic tape unit - Google Patents

Abstract

(57) [Summary] [Objective] To reduce the number of parts and the number of assembling steps of a clutch mechanism so that the strength of the chassis does not decrease and the cost for the mold for the chassis is reduced. A clutch mechanism for connecting an idler gear, which selectively engages and disengages with a supply reel table and a take-up rule table, to a capstan motor releases the connection when a predetermined load or more is applied. A fixed clutch portion 28 connected to the idler gear via a friction connection mechanism 31; and a movable clutch portion 30 that can be engaged with and disengaged from the fixed clutch portion 28.
And a clutch switching piece 3 integrally formed with the mode switching lever
2A, the clutch switching piece 32A is caused to ride on the end face 30C of the movable clutch section 30 so that the projection 30a of the movable clutch section 30
8 was engaged.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a magnetic tape device in which the number of parts and the number of assembly steps of a clutch mechanism are small, the strength of a chassis is not reduced, and a die for a chassis is cheap.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there is a technology of a magnetic tape device described in Japanese Patent Application Laid-Open No. 8-36808. One example of the technology will be described with reference to FIGS. And a take-up rule base 3 are arranged so as to be rotatable in the directions of arrows a and b, and are swingable in left and right directions c and d around a support shaft 4 provided between the two reel bases 2 and 3. An arm 5 is provided, and an idler gear 8 which is selectively engaged and disengaged with the take-up rule base 3 via the supply reel base 2 and the intermediate gear 7 is rotatably provided on the swing arm 5, and the idler gear is provided. A clutch mechanism 11 for connecting the motor 8 to the capstan motor 9 via an interlocking mechanism 10 is provided. In FIG. 16, 13 is a tape cassette, 14 is a movable tape guide for pulling out the magnetic tape t from the tape cassette 13 and wound around the head cylinder 15, 16 is a full width erasing head, 17 is a voice erasing head, and 18 is a voice erasing head. A voice / control head, 19 is a fixed guide post, 20 is a capstan that is rotated forward and backward by a capstan motor 9, 21 is a pinch roller, 22 is a tension post, and 23 is a mode that can slide in the left and right directions e and f. It is a switching lever.

As shown in FIG. 16, the interlocking mechanism 10 includes a pulley 25 fitted on a drive shaft of a capstan motor 9, a pulley 26 rotatably supported on a support shaft 4, and both pulleys. The belt 27 is wound between 25 and 26.

As shown in FIGS. 17 and 18, the clutch mechanism 11 has a plurality of (two in this configuration) protruding fixed clutch portions 28 protruding from a pulley 26 and a rotatable shaft 4. A driven clutch 29 externally fitted to the idler gear 8 and a movable clutch unit 30 slidably externally fitted to a support shaft 29a of the driven gear 29 and rotated integrally with the driven gear 29; A plurality (four in this configuration) of protruding portions 30a are provided on the outer peripheral portion of the movable clutch portion 30, a frictional coupling mechanism 31 for coupling the fixed clutch 28 to the driven gear 29 is provided, and a mode switching lever 23 is provided. And a clutch operating means 32 for operating the movable clutch unit 30 in conjunction with.

The friction coupling mechanism 31 rotatably fits between a pulley 26 and a flanged end plate 29 b integrally protruding from a support shaft 29 a of the driven gear 29, and via a bush 33 to the support shaft 29 a. It has two friction plates 31a made of felt interposed between the holding plate 34 and the pulley 26, and a connection for integrally connecting the two 34, 29 between the holding plate 34 and the driven gear 29. A spring 35 is provided, and when a load equal to or greater than a predetermined value is applied, the friction plate 31a slips and the connection by the connection spring 35 is temporarily released.

[0006] The clutch operating means 32 is provided between the holding plate 34 and the movable clutch section 30 to push up the spring 36 for separating the movable clutch section 30 from the fixed clutch section 28, The clutch lever 37 includes a substantially U-shaped clutch lever 37 which is opposed thereto, and a support shaft 37a protruding from both side surfaces of the clutch lever 37 is rotatably supported by a bearing 1a of the chassis 1 and the clutch lever 37 is provided. A cam pin 37b projecting from the center of the chassis 1 is fitted into a cam groove 38 formed in the mode switching lever 23 through the through hole 1b of the chassis 1, and comes into contact with the clutch lever 37 at a portion of the chassis 1 facing the clutch lever 37. A through-hole 1c is provided to prevent this.

In the above configuration, FIGS. 16 to 18 show a reproduction mode, in which the clutch lever 37 of the clutch mechanism 11 is separated from the movable clutch unit 30 so that the movable clutch unit 30 When the capstan motor 9 is driven to rotate forward, the swing arm 5 is moved rightward through the interlocking mechanism 10, the friction coupling mechanism 31, and the driven gear 29. The idler gear 8 is connected to the take-up rule base 3 by rotating the take-up rule base 3, whereby the take-up rule base 3 is rotated in the take-up direction a, and the take-up rule base 3 is attached to the take-up rule base 3 by the magnetic tape t. Is wound up, and as the winding diameter of the magnetic tape t increases, slippage occurs on the friction plate 31a, so that the load applied to the magnetic tape t does not become excessive. Like that.

In the reproducing / rewinding mode, by driving the capstan motor 9 in the reverse direction, the swing arm 5 swings in the reverse direction c in the reverse order to the above, so that the idler gear 8 moves the supply reel base 2. Thus, the supply reel base 2 is rotated in the rewind direction b, and the magnetic tape t is wound on the supply reel base 2.

In the fast-forward mode and the rewind mode, the mode switching lever 23 is slid leftward f to engage the peak 38a of the cam groove 38 with the cam pin 37b. As a result, as shown in FIG. 19, the clutch lever 37 moves downward about the support shaft 37a, and pushes down the movable clutch unit 30 against the spring 36. As a result, the projection 30a of the movable clutch unit 30 is engaged with the fixed clutch unit 28, whereby the idler gear 8 is directly connected to the pulley 26, and the magnetic tape t is attached to the winding rule table 3 or the supply reel table 2. Is wound at high speed.

[0010]

[Problems to be solved by the invention]

 In the above configuration, the clutch lever 37 is used as the clutch operating means 32, and since this clutch lever 37 is separate from the mode switching lever 23, the number of parts increases and the manufacturing cost increases. Further, it is necessary to attach the clutch lever 37 to the chassis 1 via the support shaft 37a, which increases the number of assembling steps and lowers work efficiency. Further, by penetrating the through holes 1b and 1c for the clutch lever 37 in the chassis 1, the strength of the chassis 1 is reduced, and the molding die of the chassis 1 is complicated only by the through holes 1b and 1c. , Mold cost is expensive.

The present invention has been made in view of the above problems, and has as its object to provide a magnetic tape device in which the number of parts and the number of assembling steps of the clutch mechanism are small, the strength of the chassis is not reduced, and the cost for the mold for the chassis is reduced. The purpose is.

[0012]

[Means for Solving the Problems]

 To achieve the above object, the invention according to claim 1 is characterized in that a clutch mechanism for connecting an idler gear which is selectively engaged and disengaged to a supply reel table and a take-up rule table to a drive unit, A mode comprising: a fixed clutch portion connected to the idler gear via a friction connection mechanism that releases the connection when a predetermined load or more is applied; and a movable clutch portion capable of engaging and disengaging the fixed clutch portion. In the magnetic tape device in which the movable clutch portion is engaged with the fixed clutch portion by clutch operating means linked to the switching lever, the idler gear is directly connected to the driving portion. A pair of clutch switching pieces projecting from the inner peripheral surface of the penetrating through hole and opposed to each other with a movable clutch part that is loosely fitted into the through hole interposed therebetween, and the clutch switching piece is moved forward. The movable clutch portion is formed so as to be engaged with the fixed clutch portion by riding on the end face of the movable clutch portion, and the clutch switching piece is formed to have a substantially triangular shape in a front view and a substantially rectangular shape in a side view. The front end ridge of the clutch switching piece is formed flat by chamfering, and the front end ridge of the clutch switching piece is formed in a substantially arc-shaped cross section.

According to a second aspect of the present invention, the clutch mechanism for connecting the idler gear which is selectively engaged and disengaged with the supply reel table and the take-up rule table to the drive unit is provided with a load exceeding a predetermined level. It has a fixed clutch part connected to the idler gear via a friction connection mechanism that releases the connection when it is engaged, and a movable clutch part that can be engaged with and disengaged from the fixed clutch part, and is interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a driving unit by engaging a movable clutch unit with a fixed clutch unit by a clutch operating unit, the clutch operating unit is provided with a through-hole penetrating the mode switching lever. A pair of clutch switching pieces projecting from the inner peripheral surface of the hole and opposed to each other with a movable clutch part that fits loosely into the through hole is interposed therebetween, and the clutch switching piece is connected to the movable clutch. The movable clutch portion is formed so as to be engaged with the fixed clutch portion by riding on the end face of the clutch portion, and the clutch switching piece is formed to have a substantially triangular shape in a front view and a substantially triangular shape in a side view. The front edge of the clutch switching piece is formed flat by chamfering, and the distal end of the clutch switching piece is formed in a substantially arc-shaped cross section.

According to a third aspect of the present invention, the clutch mechanism for connecting the idler gear that is selectively engaged and disengaged with the supply reel table and the take-up rule table to the drive unit is provided with a load exceeding a predetermined level. It has a fixed clutch part connected to the idler gear via a friction connection mechanism that releases the connection when it is engaged, and a movable clutch part that can be engaged with and disengaged from the fixed clutch part, and is interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a driving unit by engaging a movable clutch unit with a fixed clutch unit by a clutch operating unit, the clutch operating unit is provided with a through-hole penetrating the mode switching lever. A pair of clutch switching pieces projecting from the inner peripheral surface of the hole and opposed to each other with a movable clutch part that fits loosely into the through hole is interposed therebetween, and the clutch switching piece is connected to the movable clutch. The movable clutch portion is formed so as to be engaged with the fixed clutch portion by riding on the end face of the clutch portion, and the clutch switching piece approaches the front end in a substantially triangular shape with a tapered front as viewed from the front. The clutch switching piece is formed into a substantially right-angled triangular shape, the front ridge portion of the clutch switching piece is formed flat by chamfering, and the tip end of the clutch switching piece is formed in a substantially circular arc cross section. It is characterized by:

According to a fourth aspect of the present invention, the clutch mechanism for connecting the idler gear which is selectively engaged and disengaged with the supply reel table and the take-up rule table to the drive unit, has a load exceeding a predetermined level. It has a fixed clutch part connected to the idler gear via a friction connection mechanism that releases the connection when it is engaged, and a movable clutch part that can be engaged with and disengaged from the fixed clutch part, and is interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a driving unit by engaging a movable clutch unit with a fixed clutch unit by a clutch operating unit, the clutch operating unit is provided with a through-hole penetrating the mode switching lever. A pair of clutch switching pieces projecting from the inner peripheral surface of the hole and opposed to each other with a movable clutch part that fits loosely into the through hole is interposed therebetween, and the clutch switching piece is connected to the movable clutch. The movable clutch portion is formed so as to engage with the fixed clutch portion by riding on the end face of the movable clutch portion, the clutch switching piece is formed in a columnar shape, and the side surface of the movable clutch portion is It is characterized in that it is formed in a tapered shape with a taper toward the end face.

According to a fifth aspect of the present invention, the clutch mechanism for connecting the idler gear which is selectively engaged and disengaged with the supply reel table and the take-up rule table to the drive unit, has a load exceeding a predetermined level. It has a fixed clutch part connected to the idler gear via a friction connection mechanism that releases the connection when it is engaged, and a movable clutch part that can be engaged with and disengaged from the fixed clutch part, and is interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a driving unit by engaging a movable clutch unit with a fixed clutch unit by a clutch operating unit, the clutch operating unit is provided with a through-hole penetrating the mode switching lever. A pair of clutch switching pieces projecting from the inner peripheral surface of the hole and opposed to each other with a movable clutch part that fits loosely into the through hole is interposed therebetween, and the clutch switching piece is connected to the movable clutch. The movable clutch portion is formed so as to engage with the fixed clutch portion by riding on the end surface of the movable clutch portion, the clutch switching piece is formed in a spherical shape, and the side surface of the movable clutch portion is an end surface of the movable clutch portion. It is characterized in that it is formed in a tapered shape tapering toward.

According to a sixth aspect of the present invention, a clutch mechanism for connecting an idler gear, which is selectively engaged and disengaged with the supply reel table and the take-up rule table, to the drive unit, has a predetermined load or more. It has a fixed clutch part connected to the idler gear via a friction connection mechanism that releases the connection when it is engaged, and a movable clutch part that can be engaged with and disengaged from the fixed clutch part, and is interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a drive unit by engaging a movable clutch unit with a fixed clutch unit by clutch operating means, the clutch operating means is integrally formed with the mode switching lever. The movable clutch portion is engaged with the fixed clutch portion by moving the clutch switching portion over the end surface of the movable clutch portion. It is characterized by doing so.

According to a seventh aspect of the present invention, in the device according to the sixth aspect, the clutch switching is provided on an inner peripheral surface of a through hole that is provided through the mode switching lever and is loosely fitted to the movable clutch portion. A pair of protruding pieces are provided, and the two clutch switching pieces are mounted on the end face of the movable clutch part from both sides, so that the movable clutch part is engaged with the fixed clutch part.

The invention according to claim 8 is the invention according to claim 6 or 7, wherein the clutch switching piece is formed in a substantially triangular shape in a front view and a substantially rectangular shape in a side view in a tapered shape. It is characterized by having.

According to a ninth aspect of the present invention, in the invention according to the sixth to seventh aspects, the clutch switching piece is formed to have a substantially triangular shape in a front view and a substantially triangular shape in a side view. It is characterized by.

According to a tenth aspect of the present invention, in the device according to the sixth or seventh aspect, the clutch switching piece is a substantially triangular front-view triangular shape with a front end approaching the front. It is characterized by being formed in a substantially right triangle shape.

According to an eleventh aspect of the present invention, in the invention according to any one of the eighth to tenth aspects, the front ridge portion of the clutch switching piece is formed flat by chamfering. I have.

According to a twelfth aspect of the present invention, in the device according to any one of the eighth to eleventh aspects, a tip portion of the clutch switching piece is formed to have a substantially circular cross section. .

According to a thirteenth aspect of the present invention, in the device according to the sixth or seventh aspect, the clutch switching piece is formed in a cylindrical shape.

The invention according to claim 14 is characterized in that, in the invention according to claim 6 or 7, the clutch switching piece is formed in a spherical shape.

According to a fifteenth aspect of the present invention, in the device according to any one of the sixth to fourteenth aspects, the side surface of the movable clutch portion has a tapered shape tapered toward the end surface of the movable clutch portion. It is characterized by being formed in.

According to the invention of claims 1 to 15, it is apparently simple to integrally project the clutch switching piece on the mode switching lever, but by adopting a configuration which has not been considered conventionally, the components of the clutch mechanism can be obtained. It is intended to provide a magnetic tape device in which the number of points and the number of assembling steps are small, the strength of the chassis is not reduced, and the cost for the mold for the chassis is reduced.

[0028]

[Embodiment of the invention]

 FIGS. 1 to 8 show a magnetic tape device according to a first embodiment of the present invention. As shown in FIGS. 1 and 2, the clutch operating means 32 of the clutch mechanism 11 includes a pair of clutch switches. The two clutch switching pieces 32A project from the inner peripheral surface of an elongated through hole 40 penetrating through the mode switching lever 23, and the movable clutch portion 30 which fits loosely into the through hole 40 is interposed therebetween. And are arranged to face each other. In FIG. 1, reference numeral 41 denotes a rotating cam, and a sector gear 42 integrally formed concentrically with the rotating cam 41 is meshed with a rack 43 of the mode switching lever 23, and is driven by a drive motor (not shown). By rotating the rotary cam 41 by a predetermined angle, the mode switching lever 23 is slid in the left and right directions e and f via the gear 42 and the rack 43. The same components as those shown in FIGS. 16 to 19 are denoted by the same reference numerals, and description thereof is omitted.

In the above configuration, FIGS. 1, 3 and 4 show the regenerating mode, in which the clutch switching piece 32 A of the clutch mechanism 11 is in standby in the regenerating mode position A away from the movable clutch unit 30. By rotating the capstan motor 9 in the normal direction, the swing arm 5 is swung in the right direction d via the interlocking mechanism 10, the friction coupling mechanism 31, and the driven gear 29, whereby the idler gear 8 is rotated. The take-up rule base 3 is connected to the take-up rule base 3, whereby the take-up rule base 3 is rotated in the take-up direction a, the magnetic tape t is taken up by the take-up rule base 3, and the diameter of the magnetic tape t is increased. As a result, the friction plate 31a is prevented from slipping along with the increase, and the load applied to the magnetic tape t is prevented from becoming excessive.

In the reproduction / rewind mode, the capstan motor 9 is driven to rotate in the reverse direction, and the swing arm 5 is swung in the reverse direction c in the reverse procedure to rotate the idler gear 8 to the supply reel base 2. Thus, the supply reel base 2 is rotated in the rewind direction b, and the magnetic tape t is wound on the supply reel base 2.

In the fast forward mode and the rewind mode, the mode switching lever 23 is slid leftward f to move the clutch switching piece 32A to the fast forward / rewind mode position B. As a result, as shown in FIGS. 5 and 6, the clutch switching piece 32A rides on the end face 30C of the movable clutch unit 30 to push up the movable clutch unit 30 and push it down against the spring 36. As a result, the idler gear 8 is directly connected to the pulley 26 by the projection 30a of the movable clutch unit 30 being engaged with the fixed clutch unit 28, and the magnetic tape t is transferred to the take-up rule table 3 or the supply reel table 2 at a high speed. It is wound up.

According to the above configuration, when forming the clutch switching piece 32A, which is the clutch operating means 32, the clutch switching piece 32A is formed integrally with the mode switching lever 23, so that the number of parts and the number of assembly steps are reduced. The assembly work of the clutch mechanism 11 can be performed efficiently without increasing, and the manufacturing cost can be reduced. Further, since it is not necessary to penetrate the chassis 1 with through holes (see the through holes 1b and 1c in FIG. 18) for operating the clutch switching piece 32A, the strength of the chassis 1 can be maintained high. In addition, the molding die of the chassis 1 is simplified as compared with the conventional case, and the die cost is reduced.

As shown in FIG. 7 and FIG. 8, the clutch switching piece 32A is formed in an ax shape by forming the front surface 45 into a substantially triangular shape with a taper and the side surface 47 into a substantially rectangular shape. Further, both front ridges 48 of the clutch switching piece 32A are formed flat by chamfering, and the tip ridge 46 of the clutch switching piece 32A is formed in a substantially arcuate cross section. I have. A connecting piece 49 connects the clutch switching piece 32A and the mode switching lever 23.

According to the above configuration, the front ridge line portion 48 formed in a flat shape of the clutch switching piece 32A is brought into oblique surface contact with the peripheral edge portion 30B of the movable clutch section 30. Getting on and off the clutch unit 30 can be performed smoothly, and the end face 30C of the movable clutch unit 30 can be reliably pressed over a wide range by the tip ridge 46 of the clutch switching piece 32A.

Moreover, since the leading edge ridge 46 of the clutch switching piece 32A that contacts the peripheral edge 30B of the movable clutch portion 30 is formed in an arc shape, the leading edge ridge 46 can be easily formed along the peripheral edge 30B. You can get over it.

FIGS. 9 and 10 show a main part of a magnetic tape device according to a second embodiment of the present invention. The triangular shape and the side surface 47 thereof are substantially equilateral triangular so as to be formed in a pyramid shape. Also, both front ridges 48 of the clutch switching piece 32A are formed flat by chamfering and the clutch switching piece 32A is formed. The tip portion 51 of the piece 32A is formed in a substantially circular arc cross section. Since the configuration other than the above is substantially the same as that of the first embodiment shown in FIGS. 1 to 8, the same portions are denoted by the same reference numerals and description thereof will be omitted.

According to the above configuration, the front ridge line portion 48 formed in a flat shape of the clutch switching piece 32A is obliquely brought into surface contact with the peripheral edge 30B of the movable clutch section 30. It is possible to smoothly get on and off the clutch unit 30, and the tip 51 of the clutch switching piece 32A is brought into point contact with the end face 30C of the movable clutch unit 30. Since the contact resistance is small, the mode The switching lever 23 can be easily slid.

Moreover, since the distal end 51 of the clutch switching piece 32A in contact with the peripheral edge 30B of the movable clutch portion 30 is formed in an arc shape, the distal end 51 can be easily passed over the peripheral edge 30B. Can be.

FIGS. 11 and 12 show a main part of a magnetic tape device according to a third embodiment of the present invention. It is formed in a triangular wedge shape by forming the side surface 47 into a substantially right-angled triangular shape in a state where the front end portion 51 is close to the front surface 45, and the both front ridge portions 48 of the clutch switching piece 32A are formed in a rectangular shape. The front end 51 is formed in a substantially arc shape in cross section while being formed flat by chamfering. Structures other than those described above are substantially the same as those of the first embodiment shown in FIGS. 1 to 8, and therefore, the same portions are denoted by the same reference characters and description thereof will be omitted.

According to the above configuration, the front ridge line portion 48 formed in a flat shape of the clutch switching piece 32A is brought into oblique surface contact with the peripheral edge 30B of the movable clutch section 30, so that the clutch switching piece 32A is movable. Getting on and off the clutch unit 30 can be performed smoothly, and the distal end 51 of the clutch switching piece 32A is brought close to the movable clutch unit 30, so that the distal end 51 can get on and off the movable clutch unit 30 quickly. It can be carried out.

Further, since the distal end portion 51 of the clutch switching piece 32A that comes into contact with the peripheral edge portion 30B of the movable clutch portion 30 is formed in an arc shape, the distal end portion 51 can be easily passed over the peripheral edge portion 30B. Can be.

FIG. 13 shows a main part of a magnetic tape device according to a fourth embodiment of the present invention, in which a clutch switching piece 32A is formed in a cylindrical shape. Structures other than those described above are substantially the same as those of the first embodiment shown in FIGS. 1 to 8, and therefore, the same portions are denoted by the same reference characters and description thereof is omitted.

According to the above configuration, since the arc surface 52 of the clutch switching piece 32A passes from the side surface 30A of the movable clutch portion 30 to the peripheral surface 30B and comes into contact with the end surface 30C, the movable clutch portion of the clutch switching piece 32A Getting on and off the 30 can be performed smoothly.

FIG. 14 shows a main part of a magnetic tape device according to a fifth embodiment of the present invention, in which a clutch switching piece 32A is formed in a spherical shape. Structures other than those described above are almost the same as those of the first embodiment shown in FIGS. 1 to 8, and therefore, the same parts are denoted by the same reference numerals and description thereof will be omitted.

According to the above configuration, since the spherical surface 53 of the clutch switching piece 32A passes from the side surface 30A of the movable clutch portion 30 to the peripheral surface 30B and comes into contact with the end surface 30C, the movable clutch portion of the clutch switching piece 32A is contacted. Getting on and off the 30 can be done smoothly.

FIG. 15 shows a main part of a magnetic tape device according to a sixth embodiment of the present invention, in which a side surface 30 A of a movable clutch unit 30 is directed toward an end surface 30 C of the movable clutch unit 30. It is formed in a tapered shape tapering off at an angle α. Structures other than the above are substantially the same as those of the first embodiment shown in FIGS. 1 to 8, and therefore, the same parts are denoted by the same reference numerals and description thereof will be omitted.

According to the above configuration, when the clutch switching piece 32A is transferred from the side surface 30A of the movable clutch portion 30 to the end surface 30C over the peripheral portion 30B, the side surface 30A is formed in a tapered shape. The transfer can be performed smoothly.

In the sixth embodiment, the case where the spherical clutch switching piece 32A shown in the fifth embodiment shown in FIG. 14 is used has been described as an example, but the present invention is not limited to this. However, the present invention can be applied to the case where each of the clutch switching pieces 32A described in the first to fourth embodiments is used.

[0049]

[Effect of the invention]

 According to the first aspect of the present invention, when forming the clutch switching piece as the clutch operating means, the clutch switching piece is formed integrally with the mode switching lever, so that the number of parts and the number of assembly steps are increased. As a result, the assembly work of the clutch mechanism can be performed efficiently, and the manufacturing cost is reduced. Also, since there is no need to penetrate through holes for operating the clutch switching pieces in the chassis, the strength of the chassis can be maintained high, and the molding die of the chassis can be simplified as compared with the conventional case. The mold cost is cheap.

[0050] Further, since the pair of clutch switching pieces are opposed to each other with the movable clutch portion interposed therebetween, the movable clutch portion is mounted on the movable clutch portion from both sides, so that the movable clutch portion is fixed to the fixed clutch portion. Can be reliably engaged.

Further, since the flat ridge portion of the clutch switching piece is obliquely brought into surface contact with the peripheral edge of the movable clutch section, the clutch switching piece smoothly gets on and off the movable clutch section. Further, the end face of the clutch switching piece can reliably press the end face of the movable clutch portion over a wide range. In addition, since the leading edge of the clutch switching piece that contacts the peripheral edge of the movable clutch portion is formed in an arc shape, the leading edge can be easily passed along the peripheral edge.

According to the second aspect of the invention, it is possible to obtain substantially the same effect as the first aspect of the invention. In particular, the front ridge line portion of the clutch switching piece that is formed in a flat shape is movable. Since the surface of the clutch switching portion is obliquely contacted with the peripheral portion, the clutch switching piece can smoothly get on and off the movable clutch portion, and the leading end of the clutch switching piece has an end face of the movable clutch portion. The mode switching lever can be easily slid because the contact resistance is small. Further, since the distal end of the clutch switching piece that contacts the peripheral edge of the movable clutch portion is formed in an arc shape, the distal end can be easily passed along the peripheral edge.

According to the third aspect of the invention, substantially the same effects as those of the first aspect can be obtained. In particular, both side surfaces of the clutch switching piece are inclined in a tapered shape. At the same time, the front ridge portion formed flat of the clutch switching piece is brought into surface contact with the side surface of the movable clutch section, so that the clutch switching piece can smoothly get on and off the movable clutch section. Since the distal end of the clutch switching piece is brought close to the movable clutch, the distal end can quickly get on and off the movable clutch. Further, since the arc-shaped tip portion of the clutch switching piece is brought into contact from the side surface of the movable clutch portion to the end surface through the peripheral portion, the clutch switching piece can smoothly get on and off the movable clutch portion.

According to the invention described in claim 4, it is possible to obtain substantially the same effect as in the invention described in claim 1, and in particular, it is possible to change the circular-arc surface of the cylindrical clutch switching piece from the side surface of the movable clutch portion. In this case, the clutch switching piece can be smoothly brought into contact with the movable clutch portion because the clutch switching piece comes into contact with the end surface through the peripheral edge portion. Further, when the clutch switching piece is transferred from the side surface of the movable clutch portion to the end surface over the peripheral portion, the side surface of the movable clutch portion is formed in a tapered shape, so that the transfer can be performed smoothly. .

According to the fifth aspect of the present invention, substantially the same effects as those of the first aspect can be obtained. In particular, the spherical surface of the spherical clutch switching piece is moved from the side surface of the movable clutch portion to the peripheral portion. Since the clutch switching piece passes through the upper portion and comes into contact with the end face, the clutch switching piece can smoothly contact the movable clutch portion. Further, when the clutch switching piece is transferred from the side surface of the movable clutch portion to the end surface through the peripheral portion, the side surface of the movable clutch portion is formed in a tapered shape, so that the transfer can be smoothly performed. Can be.

According to the present invention, when forming the clutch switching piece as the clutch operating means, the clutch switching piece is formed integrally with the mode switching lever. The number does not increase, the assembly work of the clutch mechanism can be performed efficiently, and the manufacturing cost can be reduced. Also, since there is no need to penetrate through holes for operating the clutch switching pieces in the chassis, the strength of the chassis can be maintained high, and the molding die of the chassis can be simplified as compared with the conventional case. The mold cost is cheap.

According to the invention described in claim 7, the pair of clutch switching pieces protruding from the inner peripheral surface of the through hole of the mode switching lever are opposed to each other with the movable clutch portion interposed therebetween. By moving the clutch piece onto the movable clutch portion from both sides, the movable clutch portion can be reliably engaged with the fixed clutch portion.

According to the invention of claim 8, since both side surfaces of the clutch switching piece are inclined so as to be tapered, the clutch switching piece can smoothly get on and off the movable clutch portion. In addition, the end face of the movable clutch portion can be reliably pressed over a wide range by the leading edge portion of the clutch switching piece.

According to the invention as set forth in claim 9, since both side surfaces of the clutch switching piece are slanted in a tapered shape, the clutch switching piece can get on and off the movable clutch portion smoothly. In addition, the tip of the clutch switching piece is brought into point contact with the end face of the movable clutch part, and the contact resistance is small, so that the mode switching lever can be easily slid.

According to the tenth aspect of the present invention, since both side surfaces of the clutch switching piece are inclined in a tapered shape, the clutch switching piece can smoothly get on and off the movable clutch portion. In addition, since the distal end of the clutch switching piece is close to the movable clutch, the distal end can quickly get on and off the movable clutch.

According to the invention as set forth in claim 11, in order to bring the flat ridge portion of the clutch switching piece into surface contact with the side surface of the movable clutch section, the clutch switching piece is in contact with the movable clutch section. Getting on and off can be performed more smoothly.

According to the invention of claim 12, since the arc-shaped tip of the clutch switching piece is brought into contact with the end face from the side surface of the movable clutch portion on the peripheral portion, the contact of the clutch switching piece is formed. Getting on and off the movable clutch section can be performed smoothly.

According to the invention as set forth in claim 13, since the arc-shaped surface of the cylindrical clutch switching piece passes from the side surface of the movable clutch portion to the peripheral surface and contacts the end surface, the clutch switching piece is moved by the movable clutch. Parts can be smoothly contacted.

According to the invention of claim 14, since the spherical surface of the spherical clutch switching piece passes from the side surface of the movable clutch portion to the peripheral surface and comes into contact with the end surface, the clutch switching piece is moved by the movable clutch portion. Can be smoothly contacted.

According to the invention described in claim 15, when the clutch switching piece is transferred from the side surface of the movable clutch portion to the end surface through the peripheral portion, the side surface is formed in a tapered shape. The transfer can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a magnetic tape device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the mode switching lever.

FIG. 3 is a plan view of the clutch mechanism in a regeneration mode.

FIG. 4 is a cross-sectional view of the clutch mechanism in a regeneration mode.

FIG. 5 is a plan view of the clutch mechanism in a fast-forward / rewind mode.

FIG. 6 is a cross-sectional view of the clutch mechanism in a fast-forward / rewind mode.

FIG. 7 is a perspective view of the clutch switching piece.

FIGS. 8A to 8C are a plan view, a front view, and a side view of the clutch switching piece.

FIG. 9 is a perspective view of a clutch switching piece forming the magnetic tape device according to the second embodiment of the present invention.

FIGS. 10A to 10C are a plan view, a front view, and a side view of the clutch switching piece.

FIG. 11 is a perspective view of a clutch switching piece forming a magnetic tape device according to a third embodiment of the present invention.

12 (a) to 12 (c) are a plan view, a front view, and a side view of the clutch switching piece.

FIG. 13 is a perspective view of a clutch switching piece forming a magnetic tape device according to a fourth embodiment of the present invention.

FIG. 14 is a perspective view of a clutch switching piece forming a magnetic tape device according to a fifth embodiment of the present invention.

FIG. 15 is a front view showing a movable clutch unit forming a magnetic tape device according to a sixth embodiment of the present invention.

FIG. 16 is a schematic plan view showing a conventional example.

FIG. 17 is a plan view of the clutch mechanism in a regeneration mode.

FIG. 18 is a cross-sectional view of the clutch mechanism in a regeneration mode.

FIG. 19 is a cross-sectional view of the clutch mechanism in a fast-forward / rewind mode.

[Explanation of symbols]

 Reference Signs List 2 supply reel base 3 take-up reel base 8 idler gear 9 capstan motor (drive unit) 11 clutch mechanism 23 mode switching lever 28 fixed clutch unit 30 movable clutch unit 31 friction coupling mechanism 32 clutch operating means 32A clutch switching piece

Claims (15)

[Utility model registration claims] 1. A clutch mechanism for connecting an idler gear, which selectively engages and disengages with a supply reel table and a take-up rule table, to a drive unit, releases the connection when a predetermined load or more is applied. It has a fixed clutch portion connected to the idler gear via a friction connection mechanism, and a movable clutch portion that can be engaged with and disengaged from the fixed clutch portion, and the movable clutch portion is fixed by clutch operating means linked to the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a driving unit by engaging with a clutch unit, the clutch operating means is provided by projecting from an inner peripheral surface of a through hole formed through the mode switching lever. A pair of clutch switching pieces opposed to each other with a movable clutch part loosely fitted in the through hole interposed therebetween, and the clutch switching piece is mounted on an end face of the movable clutch part. Thereby, the movable clutch portion is formed so as to be engaged with the fixed clutch portion, and the clutch switching piece is formed in a substantially triangular shape in a front view and a substantially rectangular shape in a side view in a tapered shape, and a front ridgeline of the clutch switching piece. A magnetic tape device characterized in that a portion is formed flat by chamfering and a tip ridge portion of the clutch switching piece is formed in a substantially circular arc cross section. 2. A clutch mechanism for connecting an idler gear, which selectively engages and disengages with a supply reel table and a take-up rule table, to a drive unit, releases the connection when a predetermined load or more is applied. It has a fixed clutch portion connected to the idler gear via a friction connection mechanism, and a movable clutch portion that can be engaged with and disengaged from the fixed clutch portion, and the movable clutch portion is fixed by clutch operating means interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a driving unit by engaging with a clutch unit, the clutch operating means is provided by projecting from an inner peripheral surface of a through hole formed through the mode switching lever. A pair of clutch switching pieces opposed to each other with a movable clutch part loosely fitted in the through hole interposed therebetween, and the clutch switching piece is mounted on an end face of the movable clutch part. Thereby, the movable clutch portion is formed so as to be engaged with the fixed clutch portion, and the clutch switching piece is formed into a substantially triangular shape in a front view and a substantially triangular shape in a side view, and a front ridge portion of the clutch switching piece. Is formed flat by chamfering, and a tip end of the clutch switching piece is formed in a substantially circular arc cross section. 3. A clutch mechanism for connecting an idler gear, which selectively engages and disengages with a supply reel table and a take-up rule table, to a drive unit, releases the connection when a predetermined load or more is applied. It has a fixed clutch portion connected to the idler gear via a friction connection mechanism, and a movable clutch portion that can be engaged with and disengaged from the fixed clutch portion, and the movable clutch portion is fixed by clutch operating means interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a driving portion by engaging with a clutch portion, the clutch operating means is provided by projecting from an inner peripheral surface of a through hole formed through the mode switching lever. A pair of clutch switching pieces opposed to each other with a movable clutch part loosely fitted in the through hole interposed therebetween, and the clutch switching piece is mounted on an end face of the movable clutch part. Thereby, the movable clutch portion is formed so as to be engaged with the fixed clutch portion, and the clutch switching piece is formed into a substantially triangular shape in a side view in a side view in which a front end portion is brought closer to the front in a front view substantially triangular shape with a tapered end. A magnetic tape device, wherein a front ridge portion of the clutch switching piece is formed to be flat by chamfering, and a tip end of the clutch switching piece is formed to have a substantially circular cross section. 4. A clutch mechanism for connecting an idler gear, which selectively engages and disengages with a supply reel table and a take-up rule table, to a drive unit, releases the connection when a predetermined load or more is applied. It has a fixed clutch portion connected to the idler gear via a friction connection mechanism, and a movable clutch portion that can be engaged with and disengaged from the fixed clutch portion, and the movable clutch portion is fixed by clutch operating means interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a driving portion by engaging with a clutch portion, the clutch operating means is provided by projecting from an inner peripheral surface of a through hole formed through the mode switching lever. A pair of clutch switching pieces opposed to each other with a movable clutch part loosely fitted in the through hole interposed therebetween, and the clutch switching piece is mounted on an end face of the movable clutch part. Thereby, the movable clutch portion is formed so as to be engaged with the fixed clutch portion, the clutch switching piece is formed in a columnar shape, and the side surface of the movable clutch portion is tapered toward the end surface of the movable clutch portion. A magnetic tape device characterized by being formed in a tapered shape. 5. A clutch mechanism for connecting an idler gear, which is selectively engaged and disengaged with a supply reel table and a take-up rule table, to a drive unit, releases the connection when a predetermined load or more is applied. It has a fixed clutch portion connected to the idler gear via a friction connection mechanism, and a movable clutch portion that can be engaged with and disengaged from the fixed clutch portion, and the movable clutch portion is fixed by clutch operating means interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a driving portion by engaging with a clutch portion, the clutch operating means is provided by projecting from an inner peripheral surface of a through hole formed through the mode switching lever. A pair of clutch switching pieces opposed to each other with a movable clutch part loosely fitted in the through hole interposed therebetween, and the clutch switching piece is mounted on an end face of the movable clutch part. Thereby, the movable clutch portion is formed so as to be engaged with the fixed clutch portion, the clutch switching piece is formed in a spherical shape, and the side surface of the movable clutch portion is tapered toward the end surface of the movable clutch portion. A magnetic tape device formed in a tapered shape. 6. A clutch mechanism for connecting an idler gear, which selectively engages and disengages with a supply reel table and a take-up rule table, to a drive unit, releases the connection when a predetermined load or more is applied. It has a fixed clutch portion connected to the idler gear via a friction connection mechanism, and a movable clutch portion that can be engaged with and disengaged from the fixed clutch portion, and the movable clutch portion is fixed by clutch operating means interlocked with the mode switching lever. In a magnetic tape device in which an idler gear is directly connected to a drive unit by engaging with a clutch unit, the clutch operating means comprises a clutch switching piece integrally formed with the mode switching lever, and the clutch switching piece is moved by the movable member. A magnetic clutch, wherein the movable clutch is engaged with the fixed clutch by riding on the end face of the clutch; Tape device. 7. A pair of clutch switching pieces projecting from an inner peripheral surface of a through hole penetrating through the mode switching lever and loosely fitting into a movable clutch portion, and the two clutch switching pieces are connected to the movable clutch. 7. The magnetic tape device according to claim 6, wherein the movable clutch portion is engaged with the fixed clutch portion by riding on the end face of the portion from both sides. 8. The magnetic tape device according to claim 6, wherein the clutch switching piece is formed in a substantially triangular shape in a front view and a substantially rectangular shape in a side view. 9. The magnetic tape device according to claim 6, wherein the clutch switching piece is formed in a substantially triangular shape as viewed from the front and a substantially triangular shape as viewed from the side. 10. The clutch switching member according to claim 6, wherein the clutch switching piece is formed in a substantially triangular shape in a front view and a substantially right triangular shape in a side view with a front end portion approaching the front.
Or the magnetic tape device according to 7. 11. The magnetic tape device according to claim 8, wherein a front ridge portion of the clutch switching piece is formed flat by chamfering. 12. The magnetic tape device according to claim 8, wherein a tip portion of the clutch switching piece is formed to have a substantially circular cross section. 13. The magnetic tape device according to claim 6, wherein the clutch switching piece is formed in a cylindrical shape. 14. The magnetic tape device according to claim 6, wherein the clutch switching piece is formed in a spherical shape. 15. The magnetic tape according to claim 6, wherein a side surface of the movable clutch portion is formed in a tapered shape tapering toward an end surface of the movable clutch portion. apparatus.