JP3277688B2 - Reel shaft mechanism and tape drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel shaft mechanism and a tape drive used in a tape recorder for recording and reproducing information signals on a recording tape such as a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a tape recorder device having a rotary head device, in which a magnetic head of the rotary head device records and reproduces information signals on and from a magnetic tape as a recording tape. Have been.

As the tape recorder, there has been proposed an apparatus using a magnetic tape which is wound around a pair of tape reels housed in a cassette to form a tape cassette. In this tape recorder device, the tape cassette is mounted at a predetermined mounting position. In the tape cassette mounted in the mounting position, each of the tape reels includes:
A pair of reel shafts are inserted and engaged correspondingly. By rotating these reel shafts, the magnetic tape is
In the cassette, the running operation is performed by being unwound from one tape reel (supply reel) and taken up by the other tape reel (take-up reel).

The driving torque is transmitted to the reel shaft via a friction member from a gear that is rotated by a driving force of a driving device such as a motor. That is, the reel shaft constitutes a reel shaft mechanism together with a flange-like rotating body portion that is rotated integrally with the reel shaft, the gear, and a friction member interposed between the rotating body portion and the gear. are doing.

In this reel shaft mechanism, the rotational torque of the gear is determined by the frictional force between the gear and the friction member,
The frictional force transmitted between the friction member and the rotating portion is transmitted to the rotating portion to rotate the reel shaft. When a load greater than the frictional force is applied to the reel shaft, the reel shaft stops. That is, in this reel shaft mechanism, there is an upper limit of the driving torque transmitted to the reel shaft. When the load generated on the reel shaft exceeds the upper limit of the driving torque, the transmission of the driving torque is cut off. By interrupting the transmission of the driving torque in this way, protection of the drive unit such as the motor and the transmission gear from overload is achieved.

[0006]

In the above-mentioned reel shaft mechanism, it is necessary to set the upper limit of the driving torque transmitted via the friction member according to the value of the driving torque to be transmitted.

The upper limit of the driving torque transmitted by the reel shaft mechanism is designed to have a desired value by setting an effective radius (area) of the friction member and setting a friction coefficient by selecting a material. .

However, if the upper limit of the driving torque is to be determined by setting the effective radius of the friction member, the size of the reel shaft mechanism is restricted in the tape recorder device, so that the setting is arbitrary. Can not do. In particular, it may not be possible to increase the size of the friction member because the size of the entire tape recorder apparatus may be increased.

In order to set the upper limit of the driving torque by setting the coefficient of friction by selecting the material of the friction member, it is necessary to meet conditions such as durability, environmental resistance and temperature characteristics, and material cost. Because of this, flexible settings cannot be made.

In particular, when the reel shaft mechanism is configured to use two or more gears to transmit drive torques having different upper limits from the respective gears via friction members respectively corresponding to the gears, Becomes difficult.

Accordingly, the present invention has been proposed in view of the above-mentioned circumstances, and the upper limit of the transmitted driving torque without causing an increase in the size of the configuration, deterioration of durability, environmental resistance, and the like. It is an object of the present invention to provide a reel shaft mechanism capable of freely setting the above and a tape drive device using the reel shaft mechanism.

[0012]

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and achieve the above-mentioned object, a reel shaft mechanism according to the present invention comprises a rotatable gear and a coaxially rotatable gear. A rotating body which is supported and whose main surface is opposed to the main surface of the gear, a friction member interposed between the main surface of the gear and the main surface of the rotating body, and a reel which is integrally rotated with the rotating body; A shaft and, on each main surface of the gear and the rotating body,
A plurality of ridges arranged in a radial pattern are formed at equal angular intervals, and the ridges facing each other are opposed to each other by their respective main surfaces facing each other. It is assumed that.

According to the present invention, in the above-mentioned reel shaft mechanism, each ridge on the main surface of the gear is formed in a direction inclined in one direction with respect to a direction normal to the outer peripheral edge of the gear. Each ridge on the main surface of the rotating body opposed to the main surface is
The rotating body is formed in a direction inclined in the other direction with respect to the normal direction of the outer peripheral edge of the rotating body.

Further, the present invention is characterized in that, in the reel shaft mechanism, the number of ridges formed on the main surface of the gear and the main surface of the rotating body is different from each other.

According to the present invention, in any one of the above-described reel shaft mechanisms, one of the main surface portion of the gear and the main surface portion of the rotating body is rotatably supported coaxially with the gear and the rotating body. Another gear having a main surface portion opposed thereto, and another friction member interposed between one of the main surface portion of the gear and the main surface portion of the rotating body and the other gear, The upper limit of the torque transmitted from the other gear to the gear or the rotating body via the other friction member is different from the upper limit of the torque transmitted from the gear to the rotating body via the friction member. is there. Further, a tape drive device according to the present invention includes the above-described reel shaft mechanism, and a motor that rotationally drives a gear of the reel shaft mechanism, and the motor rotates the reel shaft by rotating the gear. The tape is run by rotating the tape reel engaged with the reel shaft and winding the tape around the tape reel.

[0017]

[0018]

In the reel shaft mechanism according to the present invention, a plurality of radially arranged ridges are provided on the main surface of the gear to be rotated and the main surface of the rotating body opposed to the main surface of the gear. Are formed at equal angular intervals, and a friction member is interposed between these main surfaces, so that the friction member is elastically deformed by each of the ridges, and the number and the amount of protrusion of the ridges By setting the above, it is possible to set the friction force generated between the friction member and the friction member, and to set the upper limit of the transmitted driving torque. In addition, since each main surface portion is opposed to each other, the ridge portions opposed to each other are in a twisted position with each other, so that the opposed ridge portions always overlap with each other in an intersecting state, When the gear and the rotating body rotate relative to each other, the pulsating movement of the ridge portion in the direction of moving the gear and the rotating body toward and away from the rotating body can be suppressed.

In the reel shaft mechanism, each ridge on the main surface of the gear is formed in a direction inclined in one direction with respect to the direction of the normal to the outer peripheral edge of the gear. The respective ridges of the surface are formed in a direction inclined in the other direction with respect to the normal direction of the outer peripheral edge of the rotating body, so that the main surfaces are opposed to each other by being opposed to each other. Each ridge is in a twisted position with respect to each other. At this time, since the opposed ridges always overlap in a state of intersecting with each other, the direction in which the gear and the rotating body are brought into contact with and separated from each other by the ridge when the gear and the rotating body relatively rotate. Pulsating movement of the vehicle is suppressed.

Further, in the above-mentioned reel shaft mechanism, when the number of ridges formed on the main surface of the gear and the main surface of the rotating body is different from each other, the number of ridges opposed to each other is different. Since the intersection positions are dispersed so that the distance from the gear axis becomes various distances, the upper limit of the transmitted drive torque may fluctuate depending on the relative angular positions of the gear and the rotating body. Absent.

In any of the above-described reel shaft mechanisms, the main surface of the gear or the rotating body is rotatably supported coaxially with the gear and the rotating body via another friction member. The upper limit of the torque transmitted to the gear or the rotating body from the other gear via another friction member is transmitted to the rotating body via the friction member from the gear. If the value is different from the upper limit of the torque to be transmitted, a different drive torque can be transmitted selectively from the gear and other gears. In addition, the tape drive device according to the present invention includes the above-described reel shaft mechanism and a motor that rotationally drives a gear of the reel shaft mechanism. Therefore, the gear is rotationally driven by this motor to rotate the reel shaft. The tape can be run by rotating the tape reel engaged with the reel shaft and winding the tape around the tape reel.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 shows a reel shaft mechanism according to the present invention.
As shown in FIG. 7, the present invention is used in the configuration of a tape recorder that writes and reads information signals to and from a magnetic tape 108 serving as a recording tape.

This reel shaft mechanism, as shown in FIG.
It has a support cylinder 36 which is a rotating body rotatably supported by a support shaft 35. The support cylinder 36 is formed in a substantially cylindrical shape, has a flange at the lower end, and the reel shaft 19 is fixedly mounted coaxially by so-called press fitting on the upper end. The reel shaft 19 is fitted and engaged with a tape reel of a tape cassette described later.
It is formed in a substantially cylindrical shape, and a reel engaging claw 39 is provided on an outer peripheral surface portion. The reel engaging claw 39 is formed in the axial direction of the reel shaft 19, and prevents relative rotation between the reel shaft 19 and the tape reel into which the reel shaft 19 is fitted and engaged.

An FF (Rew) gear 33 serving as a gear, which is located above the flange portion,
Are externally fitted. This FF (Rew) gear 33 is
The support cylinder 36 is coaxial and rotatable with respect to the support cylinder 36. Also, this F
The F (Rew) gear 33 is provided with respect to the support cylinder 36.
It is also movable in the axial direction.

Between the upper surface of the flange, which is the main surface of the support cylinder 36, and the lower surface, which is one main surface of the FF (Rew) gear 33, a first friction member is provided.
The friction member 43 is disposed. The first friction member 43 is made of an artificial leather material, for example, “Clarino”
It is formed of a material having a small friction coefficient variation and good wear resistance, such as a material commonly referred to as (trade name), having an annular shape.

As shown in FIGS. 2 and 4, a plurality of ridges 44 are integrally formed at equal angular intervals on the upper surface of the flange portion of the support cylindrical portion 36, and a first radial portion is formed. An uneven surface portion 36a is provided.

As shown in FIGS. 3 and 4, the lower surface of the FF (Rew) gear 33 has a plurality of ridges 45 integrally formed radially at equal angular intervals. A radially uneven surface portion 33b is provided. Also, this FF
(Rew) The outer peripheral edge portion of the gear 33 is a gear portion 33a.

In the tape recorder, the FF (Rew) gear 33 is provided in the FF (fast-forward) mode or the Rew (rewind) mode.
The driving force of a driving device such as a motor is transmitted through 3a, and the motor is rotated.

An upper surface, which is the other main surface of the FF (Rew) gear 33, is connected via a second friction member 42 to a lower surface, which is the main surface of the take-up gear 18, which is the second gear. Parts are opposed to each other. The take-up gear 18 is externally fitted to the support cylinder 36, and the FF (R
ew) Coaxial with the gear 33 and the FF
(Rew) It is rotatably supported by the gear 33 and the support cylinder 36. Also, this take-up gear 1
8 is also movable in the axial direction with respect to the support cylinder 36. The outer peripheral edge portion of the take-up gear 18 forms a gear portion 18a.

In the tape recorder, in the recording mode or the reproduction mode, the take-up gear 18 is rotated by receiving the driving force of a driving device such as a motor via the gear portion 18a. You.

The second friction member 42 is formed in an annular shape by a non-woven fabric such as so-called felt, for example, and is adhered to the upper surface of the FF (Rew) gear 33. On the lower surface of the take-up gear 18 facing the upper surface of the second friction member 42, an annular rib (projection) is formed coaxially with the take-up gear 18. .

Above the take-up gear 18, a rotation detecting plate 41 is provided so as to be fitted over the support cylinder 36. The rotation detection plate 41 is movable in the axial direction with respect to the support cylinder 36. The rotation detecting plate 41 is prevented from rotating with respect to the support cylinder 36 by a hook (not shown). That is, the rotation detection plate 41 is rotated together with the reel shaft 19. Also, this rotation detecting plate 4
In 1, the contact portion with the take-up gear 18 is formed only by a protruding portion at the center of the take-up gear 18, so that friction in the rotational direction with respect to the take-up gear 18 is small.

The upper surface of the rotation detecting plate 41 is subjected to a process such as a radial light / dark coating for enabling the rotation speed to be detected by an optical sensor or the like.

On the upper side of the rotation detecting plate 41, a pressing spring 40 is provided between the rotation detecting plate 41 and a spring retaining flange 38 formed on the outer peripheral surface of the reel shaft 19 at an intermediate position. It is arranged with interposition. The pressing spring 40 is fitted on the reel shaft 19 in a slightly compressed state.

The pressing spring 40 is connected to the rotation detecting plate 41.
Through the take-up gear 18 and the FF (Re)
w) The gear 33 is moved to the lower side, that is,
To the flange side. Therefore, the first
The friction member 43 is provided with the radially uneven surface portions 36a, 33
b, and the radial irregular surface portions 36
a, 33b. The second friction member 42 is sandwiched between the lower surface of the take-up gear 18 and the upper surface of the FF (Rew) gear 33, and the lower surface of the take-up gear 18 and the FF (R).
ew) It is pressed against the upper surface of the gear 33.

In the reel shaft mechanism according to the present invention configured as described above, when the FF (Rew) gear 33 is rotated, the rotational torque of the FF (Rew) gear 33 is changed to the second radial uneven surface portion. The friction between the first friction member 33b and the first friction member 43 and the friction between the first friction member 43 and the first radial uneven surface portion 36a are converted into:
The power is transmitted to the support cylinder 36. Therefore, in this reel shaft mechanism, the driving torque exceeding the frictional force generated on the upper and lower surfaces of the first friction member 43 is applied to the FF.
(Rew) The frictional force is not transmitted from the gear 33 to the support cylinder portion 36, and the upper limit of the transmitted drive torque.

In the reel shaft mechanism, the first friction member 43 is elastically deformed by the ridges 44 and 45 while the radially uneven surface 3
6a and 33b. Accordingly, the FF (Rew) gear 33 causes the support cylindrical portion 36 to move.
The upper limit of the driving torque transmitted to the ridges 44, 4
By setting the number of pieces and the amount of protrusion, the frictional force generated on the upper and lower surfaces of the first friction member 43 can be determined.

In the reel shaft mechanism, when the take-up gear 18 is rotated, the rotational torque of the take-up gear 18 is increased by the take-up gear 1.
8 and is transmitted to the FF (Rew) gear 33 via the first friction member 43 via the first friction member 43. Is transmitted to the support cylinder 36.

At this time, the take-up gear 1
From FIG. 8, the drive torque is hardly transmitted to the rotation detection plate 41 because the friction generated between the take-up gear 18 and the rotation detection plate 41 is very small.

The upper limit of the torque transmitted from the take-up gear 18 to the FF (Rew) gear 33 via the second friction member 42 is equal to the first friction from the FF (Rew) gear 33. The value is lower than the upper limit of the torque transmitted to the support cylinder 36 via the member 43.

Therefore, in this reel shaft mechanism, a driving torque exceeding the frictional force generated on the upper surface of the second friction member 42 is not transmitted from the take-up gear 33 to the support cylinder 36, This frictional force becomes the upper limit of the transmitted drive torque.

That is, in this reel shaft mechanism,
By selectively rotating the FF (Rew) gear 33 and the take-up gear 18, a drive torque having a different upper limit can be transmitted.

In this reel shaft mechanism, each of the ridges 44 of the first radially uneven surface 36a is oriented in a direction normal to the outer peripheral edge of the flange of the support cylinder 36 as shown in FIG. It is formed in a direction inclined in one direction. Further, as shown in FIG. 3, each of the ridges 45 of the second radially uneven surface 33b is provided with the FF (Rew) gear 3.
3 is formed in a direction inclined in the other direction with respect to the normal direction of the outer peripheral edge of the outer peripheral portion 3.

Therefore, in this reel shaft mechanism,
The upper surface of the flange portion of the support cylinder 36 and the FF
(Rew) When the lower surfaces of the gears 33 face each other, the ridges 44 and 45 facing each other, as shown in FIG.
They are twisted with each other.

That is, as shown in FIG. 5, the opposed ridges 44 and 45 always overlap each other in an intersecting state. The FF (Rew) does not fit in between
When the gear 33 and the support cylinder 36 rotate relative to each other, the FF (Rew) gear 33 and the flange of the support cylinder 36 come into contact with or separate from each other, that is, the pulsating movement in the vertical direction is suppressed. .

The first radially uneven surface 36a and the second radially uneven surface 33b are different from each other in the number of ridges 44 and 45 formed. The ratio of the number of the ridges 44 and 45 is not an integer. In this example, a total of 12 ridges 44 of the first radially uneven surface 36a are formed every 30 °. Also, a total of 18 ridges 45 of the second radially uneven surface 33b are formed every 20 °. Therefore, the ratio of the number of the ridges 44 and 45 is 1.
5

As described above, since the number of the ridges 44 and 45 is different, the ridges 4 opposed to each other
As shown in FIG. 5, the positions where the 4 and 45 cross and overlap each other are dispersed so that the distance from the axis of the FF (Rew) gear 33 becomes various distances. Therefore, in this reel shaft mechanism, the upper limit of the transmitted drive torque is
The upper limit of the driving torque can always be stably maintained without being changed by the relative angular position of the FF (Rew) gear 33 and the support cylinder portion 36.

The reel shaft mechanism according to the present invention is not limited to the above-described structure, and the main surface of the take-up gear 18 may be attached to the flange of the support cylinder 36 by the second friction member 42. May be configured to face each other.
In this case, when the take-up gear 18 is rotated, the support cylinder 36 is directly transferred to the support cylinder 36 via the second friction member 42 without passing through the FF (Rew) gear 33. The transmission of the driving torque is performed.

Also in this case, the upper limit of the torque transmitted from the take-up gear 18 to the support cylinder 36 via the second friction member 42 is limited to the FF (Re.
w) The value is different from the upper limit of the torque transmitted from the gear 33 to the support cylinder 36 via the first friction member 43.

Further, the reel shaft mechanism according to the present invention is characterized in that the lower surface of the FF (Rew) gear 33 and the support cylinder 3
The first friction member 43 may be attached to any one of the upper surfaces of the flange portions 6. In this case, of the lower surface of the FF (Rew) gear 33 and the upper surface of the flange of the support cylinder 36, the side on which the first friction member 43 is not bonded is radially arranged. Are formed as radially uneven surface portions formed at equal angular intervals.

In this case, the FF (Rew) gear 3
When the rotary shaft 3 is driven to rotate, the rotational torque of the FF (Rew) gear 33 is transmitted to the support cylinder 36 with the upper limit of the frictional force generated between the first friction member 43 and the radially uneven surface.

The magnetic tape 108 used in the tape recorder to which the reel shaft mechanism is applied is wound around a pair of tape reels 106 and 107 housed in a cassette as shown in FIG. It constitutes a tape cassette. The tape recorder has a rotary head device 25, and a part of the rotary head device 25 is inserted into the cassette as shown by an arrow U in FIG. Is brought into sliding contact with the magnetic tape 108 to write and read information signals to and from the magnetic tape.

The above-mentioned tape cassette has a cassette in which upper and lower halves are butt-connected. This cassette is formed in a thin housing shape with an open front side. This cassette contains a pair of tape reels 1
06 and 107 are accommodated rotatably in parallel. The magnetic tape 108 is wound around one of the tape reels 106 and 107, that is, the supply reel 107. The start end of the magnetic tape 108 is joined to the other tape reel, that is, the take-up reel 106. The portion of the magnetic tape 108 extending from the supply reel 107 to the take-up reel 106 faces outward through the open front side of the cassette.

Reel hubs 109 and 110 are fitted to the center portions of the tape reels 106 and 107, respectively. Each of the reel hubs 109 and 110 is formed in a cylindrical shape, and has an inner hole formed in the reel shaft engaging holes 121 and 12.
1 has been set. Each half of the cassette has a reel shaft insertion hole. These reel shaft insertion holes are through holes that allow the inside and the outside of the cassette to communicate with each other.
Opened at positions corresponding to the reel shaft engaging holes 121, 121, the respective reel shaft engaging holes 121, 121 face outward on the upper side and the lower side.

The cassette is configured so that a part of the rotary head device 25 can enter from the open front side. In the cassette, a pair of rotating head receiving members 11 is provided near the center of the open front side portion.
6,117 are provided. The rotary head receiving members 116 and 117 cooperate with each other, form a part of a cylindrical surface corresponding to the outer peripheral surface of the rotary head device 25, and are immersed rearward from a front portion of the cassette. A wall portion is formed.

The rotary head receiving members 116,
117 is a wing guide receiving portion 122, 123 on the side of the cassette. As described later, the wing guide receiving portions 122 and 123 are brought into contact with a pair of wing guides attached to the rotary head device 25 to perform positioning of the rotary head device 25.

In the cassette, a position for F (forward) and a position for R (reverse) are located at a position behind the magnetic tape 108 near the front side and on both sides of the rotary head receivers 116 and 117. ) Are disposed so as to be divided into right and left. These F and R pinch rollers 104, 105
Is formed in a cylindrical shape from a material having a high friction coefficient such as butyl rubber, and is rotatably supported with its outer peripheral surface substantially abutting against the back surface of the magnetic tape 108.

In the tape recorder, the reel shaft mechanism according to the present invention is arranged as a pair of reel shaft mechanisms on the T (take up) side and the S (supply) side, as shown in FIG. Has been established. The reel shafts 19 and 23 of the respective reel shaft mechanisms are rotatably supported by the support shaft 35 implanted on a chassis (not shown) constituting the tape recorder device via the support cylinder 36. It is arranged.

As described above, the take-up gear 18 and the FF gear 33 are provided at the base end portion of the T-side reel shaft mechanism.
Are coaxially mounted on the reel shaft 19. The take-up gear 18 has a larger diameter than the FF gear 33. The S-side reel shaft mechanism has the same configuration as the T-side reel shaft mechanism. That is, the take-up gear and the Rew gear 22 are coaxially attached to the reel shaft 23 also at the base end portion of the S-side reel shaft mechanism.

When the tape cassette is mounted at the mounting position on the chassis, each of the reel shafts 19 and 23 moves.
The tape reels 106 and 107 are inserted into the cassettes and inserted into the reel hubs 109 and 110 of the tape reels 106 and 107, respectively. The reel shafts 19 and 23 inserted and engaged with the respective reel hubs 109 and 110 are rotated to operate the respective tape reels 1 and 1.
06, 107 is rotated.

At the base end of the reel shaft 19 of the T-side reel shaft mechanism, a T-side transmission gear 32 meshed with the FF gear 33 is rotatably disposed via a T-side gear support arm (not shown). ing. Since the rotation axis of the T-side gear support arm is on the center axis of the T-side reel shaft 19, even if the T-side gear support arm rotates, the T-side transmission gear 32 always has the above-mentioned configuration. It is in mesh with the FF gear 33.

The S-side transmission gear 21 meshed with the Rew gear 22 is provided on the base end side of the reel shaft 23 of the S-side reel shaft mechanism via an S-side gear support arm (not shown).
Are rotatably arranged. This S-side transmission gear 21
Since the rotation axis of the S-side gear support arm is on the center axis of the S-side reel shaft 23, the S-side gear support arm always meshes with the Rew gear 22 even if the S-side gear support arm rotates. ing.

A cassette holder 65 is provided above the reel shafts 19 and 23. The cassette holder 65 is configured such that the tape cassette is an arrow K in FIG.
As shown by the arrow, the magnetic tape 108 is inserted in a predetermined approaching direction with the side facing the outside toward the front side, and is configured in a substantially housing shape so as to be able to hold the tape cassette. I have. The cassette holder 65 is provided on the rear side where the tape cassette is inserted and the cassette holder 65.
The front portion of the tape cassette held at the front surface is open. Also, the cassette holder 65 is open on the lower surface side so that the lower surface portion of the inserted tape cassette faces outward on the lower side. The cassette holder 65 has a front portion rotatably supported by the chassis, and is rotatable in a direction in which the cassette holder 65 comes into contact with and separates from the chassis.

The cassette holder 65 is rotated so as to be separated from the chassis, and the tape cassette is inserted from the rear side to hold the tape cassette. Then, as shown by an arrow L in FIG. When rotated to the chassis side, each of the reel shafts 19 and 23 holds the tape cassette held therein by the respective reel shaft engaging holes 121 and 12.
Attachment is made to the mounting position where it is inserted and engaged corresponding to 1.

The tape cassette held in the cassette holder 65 and mounted at the mounting position is inserted into and engaged with the reel shaft engaging holes 121, 121 with the reel shafts 19, 23 corresponding thereto. A portion of the magnetic tape 108 extending between the tape reels 106 and 107 faces the front side.

The tape recorder has a slide base 1 for supporting the rotary head 25. The slide base 1 is formed in a flat plate shape, and is arranged on the chassis at a position on the front side of the cassette holder 65. The slide base 1 is slidable in the front-rear direction in which the slide base 1 comes into contact with and separates from the cassette holder 65.

The rotating head device 25 disposed on the slide base 1 is formed in a substantially cylindrical shape, is coaxial with each other, and is fixed to the upper side of the slide base 1. And a lower fixed drum. Between these fixed drums, a rotatable drum rotatably supported coaxially with the respective fixed drums is disposed. A magnetic head is attached to the rotating drum. The rotating drum is rotated by a drum motor (not shown) housed in the lower fixed drum.

In the rotary head device 25, when the tape cassette is mounted at the mounting position, the slide base 1 is advanced toward the cassette holder 65 as shown by an arrow U in FIG. Enters the cassette from the front side. The rotating head device 25 that has entered the cassette slides the magnetic tape 108 facing the front side of the cassette on the outer peripheral surfaces of the fixed drums and the rotating drum, and further rotates the rotating drum. By using the magnetic tape 10
8 in high speed. That is, the rotary head device 25 uses the magnetic head to
, An information signal is written and read by a so-called helical scan method.

The transmission and reception of information signals to and from the magnetic head of the rotary head device 25 are performed by a flexible substrate 34 connected to the upper fixed drum and a rotary board disposed between the upper fixed drum and the rotary drum. This is done via a transformer.

The rotary head device 25 is connected to a pair of F and R capstan shafts 7 and 14 via a pair of F (forward) and R (reverse) capstan support arms 28 and 29. Is attached. Each of the capstan support arms 28, 29 has a base end on the upper fixed drum 26 via a support shaft 61, 62.
It is rotatably attached to the upper surface of the. These capstan support arms 28 and 29 are arranged so as to protrude in both side directions of the rotary head device 25. Each of the capstan shafts 7 and 14 is formed in a columnar shape, and has an upper end side on each of the capstan support arms 28 and 29.
And is rotatably supported and suspended. At the lower ends of the capstan shafts 7, 14, a capstan gear 6 for F and a capstan gear 13 for R for rotating the capstan shafts 7, 14 are mounted in a corresponding manner.

The capstan shafts 7 and 14 are rotatable around the base shafts of the capstan support arms 28 and 29 with respect to the rotary head device 25, respectively. It is configured to be rotatable around the axis with respect to the stun support arms 28 and 29. When the tape cassette is mounted at a predetermined position, each of the capstan shafts 7 and 14 moves the pinch roller 10 of the tape cassette.
4, 105.

The rotary head device 25 is provided with a pair of wing guides 30 and 31. The wing guides 30 and 31 are supported by the fixed drums 26 and 63 of the rotary head device 25 via support members on both front sides facing the cassette holder 65 via support members. These wing guides 30,
Reference numeral 31 denotes a substantially cylindrical shape whose front end facing the cassette holder 65 has its axis substantially parallel to the center axis of the rotary drum.

When the tape cassette is mounted at a predetermined position and the slide base 1 is moved forward toward the tape cassette, the wing guides 30 and 31 come into contact with the wing guide receiving portions 122 and 123. The wing guides 30 and 31 abut on the wing guide receiving portions 122 and 123 to position the rotary head device 25 with respect to the cassette and guide the traveling path of the magnetic tape 108.

Then, on the slide base 1, the rotation of the drum motor is transferred to each of the capstan shafts 7, 1.
4 and a plurality of gears for transmission to the pair of reel shaft mechanisms are rotatably disposed.

That is, the drum motor rotates the drive gear 2 attached to the drive shaft as shown by the arrow A in FIG. The drive gear 2 meshes with a first transmission gear 3 rotatably disposed on the slide base 1. In this first transmission gear 3, second and third transmission gears 4, 5 are integrally formed coaxially. The second transmission gear 4 meshes with the F capstan gear 6.

The second transmission gear 4 is coaxial with the support shaft of the F capstan support arm 28,
Even if the capstan support arm 28 for F rotates, it always meshes with the capstan gear 6 for F.

The third transmission gear 5 meshes with a fourth transmission gear 8 rotatably disposed on the slide base 1. The fourth transmission gear 8 meshes with a fifth transmission gear 9 rotatably disposed on the slide base 1. The fifth transmission gear 9 is a gear in which a large-diameter gear portion and a small-diameter gear portion are integrally formed coaxially, and the small-diameter gear portion is meshed with the fourth transmission gear 8. . The large-diameter gear portion of the fifth transmission gear 9 meshes with a sixth transmission gear 12 rotatably disposed on the slide base 1. The sixth transmission gear 12 is a gear in which a large-diameter gear portion and a small-diameter gear portion are integrally formed coaxially. The large-diameter gear portion meshes with the fifth transmission gear 9. I have. The small-diameter gear portion of the sixth transmission gear 12 meshes with the R capstan gear 13.

The sixth transmission gear 12 is coaxial with the support shaft of the R capstan support arm 29. Even if the R capstan support arm 29 rotates, the sixth transmission gear 12 is always in the R position. With the capstan gear 13.

The fourth transmission gear 8 is meshed with a seventh transmission gear 15 rotatably disposed at a front end side portion of the slide base 1 on the cassette holder 65 side. The seventh transmission gear 15 is provided at the front end portion of the slide base 1.
, And meshes with an eighth transmission gear 20 which is rotatably arranged side by side.

That is, when the drum motor is being driven, the F capstan shaft 7 rotates in the direction for feeding the magnetic tape 108 in the forward direction (forward direction) as shown by the arrow F in FIG. Being operated. Also,
When the drum motor is being driven, the R capstan shaft 14 is rotated in the direction for feeding the magnetic tape 108 in the reverse direction (reverse direction) as indicated by the arrow J in FIG. Further, when the drum motor is driven, the seventh and eighth transmission gears 1 are driven.
5, 20 are rotated.

On the chassis, rotatable first and second FR gears 16 and 17 are disposed so as to be movable. These FR gears 16 and 17 are gears having different diameters formed coaxially and integrally with each other.

Then, a stop (St) is placed on the chassis.
op) mode, fast forward (FF) mode, rewind (Re)
w) mode, pause (Pause) mode, forward recording (playback) (Forward) mode, and reverse recording (playback) (Reverse) mode. A moving operation mechanism for moving and operating the slide base 1, each of the gear support arms, and each of the FR gears 16 and 17 is provided.

In the tape recorder configured as described above, in the stop mode, the slide base 1 is set to the retreat position, and the FR gear 1
Numerals 6 and 17 are the center positions of the reel shafts 19 and 23. Each of the gear support arms is provided with a supporting T
The S-side transmission gears 32 and 21 are separated from the seventh and eighth transmission gears 15 and 20.

When the tape cassette is mounted at the mounting position and the fast-forward mode is selected, the slide base 1 remains at the retracted position. And
In the fast-forward mode, the drum motor is driven to rotate. The T-side gear support arm is rotated, and the T-side transmission gear 32 supported by the T-side gear support arm is rotated.
Meshes with the seventh transmission gear 15.

Therefore, at this time, the driving force of the drum motor is transmitted to the T-side reel shaft 19 via the FF gear 33. The T-side reel shaft 19 is a T-side tape reel 10 engaged with the T-side reel shaft 19.
6 is rotated to wind the magnetic tape 108 at high speed.

In the rewind mode, the slide base 1 remains at the retracted position. In the rewind mode, the drum motor is driven to rotate. The S-side gear support arm is rotated, and the S-side transmission gear 21 supported by the S-side gear support arm meshes with the eighth transmission gear 20.

Therefore, at this time, the driving force of the drum motor is transmitted to the S-side reel shaft 23 via the Rew gear 22. The S-side reel shaft 23 is an S-side tape reel 1 engaged with the S-side reel shaft 23.
07 is rotated to wind the magnetic tape 108 at high speed.

In the temporary stop mode, the slide base 1 is moved to the forward position. Each FR above
The gears 16 and 17 are at neutral positions, which are the central positions of the reel shafts 19 and 23. Each of the gear supporting arms is supported by a supporting T-side and S-side transmission gear 3.
2 and 21 are separated from the seventh and eighth transmission gears 15 and 20.

In the progressive recording (reproduction) mode, the slide base 1 is moved to the forward position, and the drum motor is driven to rotate.

In the progressive recording (reproduction) mode, the first FR gear 16 is connected to the seventh transmission gear 15
, And the second FR gear 17 is meshed with the take-up gear 18. Therefore, at this time, the driving force of the drum motor is transmitted to the T-side reel shaft 19 via the take-up gear 18. This T
The side reel shaft 19 rotates the T-side tape reel 106 engaged with the T-side reel shaft 19 to wind up the magnetic tape 108.

At this time, the F capstan support arm 28 is rotated toward the tape cassette, and the F capstan shaft 7 is moved to the F pinch roller 104.
The magnetic tape 108 is pinched in cooperation with the above. The magnetic tape 108 is operated at a constant speed in the forward direction.

The rotary head device 25 is positioned by the cassette, and writes or reads an information signal to or from the magnetic tape 108 that is being operated by the magnetic head.

In the reverse feed recording (reproduction) mode, the slide base 1 is moved to the forward position, and the drum motor is driven to rotate.

In the reverse feed recording (reproduction) mode, the first FR gear 16 is connected to the eighth transmission gear 20.
, And the second FR gear 17 is meshed with the S-side take-up gear. Therefore, at this time, the driving force of the drum motor is transmitted to the S-side reel shaft 23 via the take-up gear. The S-side reel shaft 23 engages with the S-side reel shaft 23
By rotating the side tape reel 107, the magnetic tape 1 is rotated.
08 is wound up.

At this time, the R capstan support arm 29 is rotated toward the tape cassette, and the R capstan shaft 14 is moved to the R pinch roller 10.
5, the magnetic tape 108 is pinched. The magnetic tape 108 is operated at a constant speed in the reverse direction.

The rotary head device 25 is positioned by the cassette, and writes or reads an information signal to or from the magnetic tape 108 that is being operated by the magnetic head.

This tape recorder is a so-called non-tracking type digital signal recording and reproducing device, and the information signal written on the magnetic tape 108 is a digital signal. In this tape recorder device, when reading an information signal from the magnetic tape 108, tracking control for the magnetic head is not performed, the read information signal is rearranged based on an address signal, and then an analog signal is read. Demodulated to

[0098]

[0099]

[0100]

As described above, in the reel shaft mechanism according to the present invention, the main surface of the rotating gear and the main surface of the rotating body opposed to the main surface of the gear are radially arranged. A plurality of projected ridges are formed at equal angular intervals, friction members are interposed between these main surfaces, and the main surfaces are opposed to each other by being opposed. Each of the ridges is in a twisted position.

Therefore, in this reel shaft mechanism,
Since the friction member is elastically deformed by each ridge, the frictional force generated between the friction member and the friction member can be set by setting the number of the ridges and the amount of protrusion, and the upper limit of the transmitted driving torque is reduced. In addition to being able to be determined, the opposed ridges always overlap with each other in an intersecting state, so that the gear and the rotating body are brought into contact with and separated from the gear by the ridge when the gear and the rotating body relatively rotate. Pulsating movement in the direction can be suppressed.

In the reel shaft mechanism, each ridge on the main surface of the gear is formed so as to be inclined in one direction with respect to the normal direction of the outer peripheral edge of the gear. The respective ridges of the surface are formed in a direction inclined in the other direction with respect to the normal direction of the outer peripheral edge of the rotating body, so that the main surfaces are opposed to each other by being opposed to each other. Each ridge can be in a twisted position with respect to each other. Since the opposed ridges always overlap each other in an intersecting state, when the gear and the rotating body relatively rotate, the ridges cause the gear and the rotating body to move in the direction of coming and going. Pulsating movement is suppressed.

Further, in the above reel shaft mechanism, when the number of the ridges formed on the main surface of the gear and the main surface of the rotating body are different from each other, the number of the ridges opposed to each other is different. Since the intersection positions are dispersed so that the distance from the gear axis becomes various distances, the upper limit of the transmitted drive torque may fluctuate depending on the relative angular positions of the gear and the rotating body. Absent.

In any of the above-described reel shaft mechanisms, the main surface of the gear or the rotating body is rotatably supported coaxially with the gear or the rotating body via another friction member. The upper limit of the torque transmitted to the gear or the rotating body via the other friction member from the other gear is transmitted to the rotating body via the friction member from the gear. If the value is different from the upper limit of the torque to be transmitted, a different drive torque can be transmitted selectively from the gear and other gears. Further, in the tape drive device according to the present invention, since the above-described reel shaft mechanism and a motor for rotating and driving the gear of the reel shaft mechanism are provided, the gear is rotationally driven by this motor to rotate the reel shaft. Rotate
The tape can be run by rotating the tape reel engaged with the reel shaft and winding the tape around the tape reel.

That is, the present invention provides a reel shaft mechanism which can freely set the upper limit of the transmitted drive torque without causing an increase in the size of the structure and deterioration of durability, environmental resistance and the like. It is possible to provide a tape drive using the reel shaft mechanism.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a reel shaft mechanism according to the present invention.

FIG. 2 is a plan view showing a configuration of a main part of a support cylinder portion constituting the reel shaft mechanism.

FIG. 3 is a bottom view showing a configuration of a main part of an FF (Rew) gear constituting the reel shaft mechanism.

FIG. 4 is an enlarged longitudinal sectional view of a main part showing a configuration of a main part of the support cylinder part and the FF (Rew) gear.

FIG. 5 is a plan view transparently showing a state in which the support cylinder and the FF (Rew) gear face each other.

FIG. 6 is an exploded perspective view showing a configuration of a main part of a tape recorder having a reel shaft mechanism according to the present invention and a main part of a tape cassette mounted on the tape recorder;

[Explanation of symbols]

 Reference Signs List 18 Take-up gear 18a Gear part 19 Reel shaft 33 FF (Rew) gear 33a Gear part 33b Second radial uneven surface part 36 Support cylinder part 36a First radial uneven surface part 42 Second friction member 43 First friction member

Claims (8)

(57) [Claims] 1. A gear that is operated to rotate, and coaxially supported by the gear so as to be rotatable,
A rotating body having a main surface facing the main surface of the gear; a friction member interposed between the main surface of the gear and the main surface of the rotating body; and a rotating member integrally rotated with the rotating body. A plurality of ridges arranged radially are formed on each main surface of the gear and the rotating body at equal angular intervals, and the main surfaces are opposed to each other. The reel shaft mechanism, wherein each of the ridge portions facing each other is in a twisted position. 2. Each of the ridges on the main surface of the gear is formed in a direction inclined in one direction with respect to the normal direction of the outer peripheral edge of the gear. 2. The reel shaft mechanism according to claim 1, wherein each of the ridges on the main surface is formed in a direction inclined in the other direction with respect to a normal direction of an outer peripheral edge of the rotating body. 3. The reel shaft mechanism according to claim 1, wherein the number of ridges formed on the main surface of the gear and the main surface of the rotating body are different from each other. 4. A gear and a rotatable member which are coaxially supported and rotatably supported, and wherein the main surface portion is opposed to one of the main surface portion of the gear and the main surface portion of the rotary member. A gear, and another friction member interposed between one of the main surface of the gear and the main surface of the rotating body and the other gear; and the other friction from the other gear. The upper limit of torque transmitted to the gear or the rotating body via a member is different from the upper limit of torque transmitted from the gear to the rotating body via a friction member. The reel shaft mechanism according to claim 2 or 3. 5. A gear to be rotated, a rotating body coaxial with the gear, rotatably supported and having a main surface facing a main surface of the gear, a main surface of the gear, and a rotating body. A reel shaft mechanism having a friction member interposed between the main surfaces of the rotary shaft and a reel shaft rotated integrally with the rotary body; and a motor for rotating the gear, the gear and the rotary body. On each main surface portion, a plurality of ridge portions arranged radially are formed at equal angular intervals, and the ridge portions opposed to each other by the respective main surface portions are twisted with each other. The motor rotates the reel shaft by rotating the gear, and rotates the tape reel engaged with the reel shaft to wind the tape on the tape reel. The tape Tape drive, characterized in that to the row. 6. Each of the ridges of the main surface of the gear of the reel shaft mechanism is formed in a direction inclined in one direction with respect to the normal direction of the outer peripheral edge of the gear, and is opposed to the main surface of the gear. 6. The tape drive device according to claim 5, wherein each of the ridges on the main surface of the rotating body is formed in a direction inclined in the other direction with respect to a normal direction of an outer peripheral edge of the rotating body. . 7. The tape drive device according to claim 5, wherein the number of protrusions formed on the main surface of the gear and the main surface of the rotating body in the reel shaft mechanism are different from each other. 8. The reel shaft mechanism is rotatably supported coaxially with the gear and the rotating body, and has the main surface facing one of the main surface of the gear and the main surface of the rotating body. And another friction member interposed between one of the main surface portion of the other gear and the main surface portion of the gear and the main surface portion of the rotating body, The upper limit of the torque transmitted from the other gear to the gear or the rotating body via the other friction member is different from the upper limit of the torque transmitted from the gear to the rotating body via the friction member. The tape drive according to claim 5, 6, or 7, wherein: