JP2548214B2 - Reverse type tape recorder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse type tape recorder that runs a magnetic tape at a constant speed in first and second directions.

2. Description of the Related Art In recent years, as a tape recorder, a reverse type has become popular in which a cassette tape or the like is turned over and the A side and B side are reproduced without being remounted. Further, these tape recorders tend to be smaller, thinner and lighter. In particular, portable cassette tape recorders are particularly required to have a storability, and this tendency is remarkable, and at the same time, the market demands a lower price.

A conventional reverse type tape recorder will be described below with reference to the drawings.

FIG. 12 and FIG. 13 show a configuration of a conventional reverse type tape recorder for switching between first and second constant speed running. In the drawing, reference numeral 1 denotes a main gear, which is interlocked with a reversing capstan (not shown) and rotates counterclockwise. A cam gear 2 is rotatably provided on the shaft 3 and is configured to be meshed with a drive gear 1a which is concentrically and integrally formed with the main gear 1 and has first and second toothless portions 2a and 2b. have. A locking lever 4 is rotatably provided on the shaft 5 and is urged clockwise by a spring 6. One end 4a of the locking lever 4 is the first of the cam gear 2
It is configured to lock the second locking portions 2c, 2d,
The first toothless portion 2a is located on the drive gear 1a when the locking portion 2c of the above is locked, and the second toothless portion when the second locking portion 2d is locked. 2b is located in the drive gear 1a. Reference numeral 7 is a solenoid that is constructed so that the attraction piece 8 is attracted to the attraction portion 7b by the permanent magnet 7a when it is not energized, and when it is energized, the attraction force is almost canceled and disappears. The suction piece 8 is rotatably provided on a shaft 4c of the other end 4b of the locking lever 4. Reference numeral 9 is a positive / negative lever rotatably provided on the shaft 10, and a cam hole 9b is formed at one end 9a thereof. The rotation of the cam gear 2 controls the cam hole 9b by the protrusion 2e to move the positive / negative lever 9 It is configured to swing.

 Next, the operation of the above configuration will be described.

When the magnetic tape (not shown) reaches the end in the constant speed running state in the first direction in FIG. 12, the reel base (not shown) stops rotating. When the reel base (not shown) stops rotating, the termination detecting means (not shown) composed of an electric switch or the like detects that the reel stops rotating, and the solenoid 7 is energized.
As shown in the figure, the suction of the suction piece 8 on the suction portion 7b is released. When the suction of the suction piece 8 is released, the locking lever 4 is released.
Is rotated clockwise by the spring 6. When the locking lever 4 is rotated in the same direction, the locking of the first locking portion 2c of the cam gear 2 by the one end 4a is released, and the pressing portion 4d of the locking lever 4 is moved by the pressing portion 4d of the cam gear 2. Second locking part
The rear surface 2f of 2d is pressed to rotate the cam gear 2 in the clockwise direction so as to mesh with the drive gear 1a as shown in FIG. When the cam gear 2 meshes with the drive gear 1a, the cam gear 2 rotates clockwise until the second toothless portion 2b is located on the drive gear 1a. When the cam gear 2 is thus rotated, the forward / reverse lever 9 is rotated clockwise from the state shown in FIG. 12 by controlling the cam hole 9b by the projecting portion 2e to switch the constant speed traveling means (not shown) to the second position. It becomes a constant speed running state in the direction of. When the cam gear 2 rotates, the first locking portion 2c contacts the return control portion 4e of the locking lever 4 and rotates the locking lever 4 counterclockwise against the spring 6. The attraction piece 8 is again attracted to the attraction portion 7b of the solenoid 7.

At the same time, the second locking portion 2d of the cam gear 2 is locked by the other end 4a of the locking lever 4, and the second toothless portion 2b of the cam gear 2 is held in a state of being positioned on the drive gear 1a. .

 Therefore, the constant speed traveling state in the second direction is maintained.

Problems to be Solved by the Invention However, in the conventional configuration, the first and second solenoids are used.
Since the second constant speed traveling is switched, there is a drawback that it becomes expensive. Further, in order to detect the stop of the reel base at the end of the tape, the end detection means must be configured by an electric switch or the like, and an electric control circuit is also required, which is also a factor that becomes expensive. Further, this end detection means is generally constructed on one reel stand (first or second reel stand). In this case, however, when the end detection is carried out on the supply reel stand, the magnetic tape sags. Therefore, there is a problem that malfunction occurs such that the stop of the reel stand is detected and the constant speed traveling state is switched from the first to the second or from the second to the first. In order to solve this problem, if the end detection means is provided on each of the first and second reel bases, this also becomes expensive, and it also takes up space and becomes an obstacle to downsizing.

In view of the above problems, the present invention has a simple structure for detecting the end point and switching between the first and second constant speed traveling operations, can be made inexpensive, downsized, and made thin, and does not cause a malfunction. A reverse type tape recorder is provided.

Means for Solving the Problems In order to solve the above problems, a reverse type tape recorder of the present invention has a first rotating body which rotates in conjunction with a motor, and a concentric slip with the first rotating body. A second rotary body to which the rotation of the first rotary body is transmitted via means, a reel base drive gear integrally formed with the second rotary body, and a rotation of the reel base drive gear. A switching gear that is transmitted to the first or second reel base to wind the tape, and a switching operation that rotationally transmits the switching gear to the first or second reel base.
The second pinch roller is reciprocated between the first and second positions so as to switch between the first and second constant speed running of the magnetic tape, which controls the pressure and separation of the second pinch roller to and from the first and second capstans. A switching member that operates, a cam gear having two toothless teeth that reciprocate the switching member to the first and second positions, a drive gear that drives this cam gear, and a toothless portion of the cam gear that serves as the drive gear. A locking member that locks the positioned state,
A holding member for holding the locking member in the locked state of the cam gear, and a swing cam near the center of the first rotating body and surrounding the second rotating body, and an outer peripheral position of the swing cam. An operating cam is formed on the second rotating body, which has a sliding contact projection slidably contacting the swing cam and the operating cam, and has a pressure contact portion in contact with the second rotating body, and which is added to the pressure contact portion. It is provided with a detection lever which is rotationally driven by the rotational force of and the rocking cam is rocked by the rocking cam.

The present invention has the above-described configuration, and makes contact with the swing cam during the winding rotation of the first or second reel base during the first or second constant speed traveling, that is, during the rotation of the second rotating body. When the detection lever is swung within the range in which the holding member does not operate due to the rotational drive applied to the portion, and the first or second reel base and the second rotating body stop rotating at the end of the magnetic tape, the pressure contact is made. When the swing cam rotates the detection lever in the direction of the holding member, the actuating cam further rotates in the same direction to actuate the holding member without applying rotational drive to the portion. Alternatively, the constant speed traveling in the second direction is switched. Therefore, by detecting the rotation of the second rotating body, the reel stand on the take-up side can always be stopped at the first and second reel stands, and also during the first and second constant speed runs. Since it can be detected, it does not malfunction even if the tape on the supply side sags. Moreover, the configuration is simple. Furthermore, the end point detection and the constant speed traveling can be switched without using an electric switch, a solenoid or the like, which is inexpensive.

Example Hereinafter, a reverse type tape recorder of an example of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing the entire construction of a reverse type tape recorder in a stopped state in an embodiment of the present invention, FIG.
FIG. 4 is a plan view of an essential part showing a reproduction state in the first direction,
FIG. 5 is a side view of the same, FIG. 7 is a schematic plan view showing the end detection unit, and FIGS. 8 and 9 are front views of the same. 11 in the above figure
Is a first capstan, which is rotatably provided on a bearing (not shown) and integrally has a first flywheel 12. A second capstan 13 is rotatably provided on a bearing (not shown), and integrally has a second flywheel 14 and a flywheel gear 15. 16 is a belt motor
The clockwise rotation of 17 causes the first capstan 11 and the first flywheel 12 to rotate counterclockwise, and the second capstan 13, the second flywheel 14 and the flywheel gear 15 to rotate clockwise. It is suspended via a rotatable intermediate pulley 20 on a shaft 19 of the lower substrate 18 so as to rotate. Reference numeral 21 denotes a first pinch roller, which is rotatably provided on a shaft 23 of a first pinch roller lever 22. The first pinch roller lever 22 is rotatably provided on the shaft 24 of the lower substrate 18. A second pinch roller 25 is rotatably provided on the shaft 27 of the second pinch roller lever 26. The second pinch roller lever 26 is rotatably provided on the shaft 28 of the lower substrate 18. An L-shaped head substrate 29 has a magnetic head 30 and a tape guide 31, and has a PLAY button 32. The play substrate 32 is slidably provided on the shafts 33 and 34 of the lower substrate 18, and the spring 35 causes an arrow. It is biased in the A direction.

A first pinch roller spring 36 is provided on the shaft 24 together with the first pinch roller lever 22. One end 36a is on the bent portion 22a of the first pinch roller lever 22 and the other end 36b is on the head substrate. The first bending portion 29a is formed below the first pinch roller 21 of 29. 37 is second
Second pinch roller lever
26 is provided on the shaft 28 together with one end 37a at the bent portion 26a of the second pinch roller lever 26, and the other end 37b is formed on the head substrate 29 below the second pinch roller 25 of the second pinch roller 25. It is hung on the bent part 29b.

The first and second pinch roller springs 36 and 37 connect the first and second pinch rollers 21 and 25 to the first and second capstans 11 and 13, respectively.
The first and second pinch roller levers 2 to be crimped to
It is configured to urge 2, 26 clockwise and counterclockwise. The first bent portion 29a of the head substrate 29 is the first bent portion 29a.
To the bent portion 22a of the pinch roller lever 22 of the second bent portion 2
9b is configured to contact the bent portion 26a of the second pinch roller lever 26, and when the head substrate 29 is at the stop position as shown in FIG. 1, the first and second pinch rollers 21 and 25 are moved to the first position. Therefore, the first and the second capstans 11 and 13 should be separated from each other.
The second pinch roller levers 22 and 26 are moved backward. Reference numeral 38 denotes an operating gear, which is rotatably provided on the cylindrical portion 39a of the friction pulley 39 as shown in FIG.
The slip surface 39b of this friction pulley 39 is made of felt 4
So as to come into pressure contact with the flat surface portion 38a of the operating gear 38 via 0,
One end surface is a spring receiving portion 38b of the operating gear 38, and the other end surface is a reel stand drive gear press-fitted into the friction pulley 39.
A compression spring 42 received at 41 is constructed. The outer peripheral gear portion 38c of the operating gear 38 is meshed with the flywheel gear 15 and is rotationally driven counterclockwise. The friction pulley 39 and the reel base drive gear 41 are the shaft 43a of the upper substrate 43.
It is rotatably installed. Numeral 44 is a reel base switching gear PLAY rotatably provided on the large diameter portion 43b of the shaft 43a.
The shaft 46 of the lever 45 is configured to be rotatable and meshes with the reel base drive gear 41. The PLAY lever 45 is biased counterclockwise by a spring 47. Reference numeral 48 is a first relay gear, which is configured to be rotatable with respect to a shaft 51 of an FF lever 50 rotatably provided on a large diameter portion 49a of a shaft 49 of the upper substrate 43, and can be meshed with the reel base switching gear 44. It is provided in. The FF lever 50 is biased counterclockwise by a spring 52. A second relay gear 53 is rotatably provided on the shaft 49 and is rotatable with the bearing (not shown) of the upper substrate 43 integrally with the first relay gear 48 and the first reel stand 54. Is meshed with the first reel gear 55 provided on the. the above
The control pin portion 50a of the FF lever 50 is controlled by the first control portion 29d of the protruding portion 29c of the head substrate 29. The first bent portion 50b of the FF lever 50 is controlled by the second control shaft 29e of the protruding portion 29c of the head substrate 29. Furthermore, the second bent portion of the FF lever 50
50c controls the first control unit 45a of the PLAY lever 45. 56 is a third relay gear, and is the upper substrate 43 above.
Rotatably provided on a shaft 59 of a REW lever 58 rotatably provided on a shaft portion 57 of the reel unit, configured to be meshable with the reel base switching gear 44, and a reel base of the base 2 (not shown).
Bearings integrally formed with the shaft 57 (not shown)
It is meshed with a second reel gear 60 rotatably provided in the. The REW lever 58 is biased counterclockwise by a spring 61. 62 is a cam gear, which is the shaft 63 of the upper substrate 43.
Is rotatably provided and is configured to mesh with a cam drive gear 64 that is integral with the operating gear 38. The cam gear 62 includes first and second toothless portions 62a and 62b, and first and second engaging portions 62.
The c and 62d are formed symmetrically with respect to the shaft 3, and the drive portion 62e is formed at substantially the same position as the second locking portion 62d. Reference numeral 65 denotes a forward / reverse lever, which is rotatably provided on the shaft 66 of the upper substrate 43, and has a drive portion 6 of the cam gear 62 at one end 65a.
It has a control hole portion 65b controlled by 2e. This diametrically opposite lever 65 has a second tooth-missing position at the first constant speed position shown in FIGS. 2 and 4 when the first tooth-missing portion 62a of the cam gear 62 is positioned at the cam drive gear 64. When the portion 62b is located in the cam drive gear 64, the control hole portion 65b is controlled by the drive portion 62c of the cam gear 62 so as to be in the second constant speed traveling position of FIG. There is. 67 is a positive / negative rod, one end 67a is rotatably provided on the shaft 68 of the other end 65c of the positive / negative lever 65, and the other end 67b is slidably provided on the shaft 69 of the lower substrate 18. The first control step 67c of the positive / negative rod 67 is the bent portion 2 of the first pinch roller lever 22.
2a, the second control step 67d controls the bent portion 26a of the second pinch roller lever 26, and in the state of FIGS. 2 and 4, the second pinch roller 25 is moved to the second cap. The second pinch roller 21 is separated from the stun 13 against the second pinch roller spring 37, and the second pinch roller 21 is moved to the first capstan 11
The first pinch roller spring 36 presses the first pinch roller spring 36 to the first constant speed running state, and in the state shown in FIG. 3, the first pinch roller 21 is moved from the first capstan 11 to the first pinch roller spring 36. The second pinch roller 25 is pressed against the second capstan 13 by the second pinch roller spring 37 so as to be in a second constant speed traveling state. The convex portion 65d of the one end 65a of the positive / negative lever 65 is
The second control unit 45b of the PLAY lever 45 is controlled so that the forward / reverse lever 65 is in the first constant-speed traveling state shown in FIGS.
The PLAY lever 45 is rotated clockwise against the spring 47 to engage the reel base switching gear 44 with the first relay gear 48, and in the second constant speed traveling state of FIG. 3, the PLAY lever 45 is engaged.
Is rotated clockwise by a spring 47 so that the reel base switching gear 44 meshes with the third relay gear 56. 70 is a lock rod, one end 70a of which is above the upper substrate 43
The first bent portion 70c of the other end 70b is attached to the shaft 71 of the lower substrate 18
Is slidably provided in the guide hole 18a and is urged in the arrow B direction by the spring 61. The first bent portion 70c of the lock rod 70 has the lock portion 29f of the head substrate 29 formed in the second portion.
It is configured to be locked as shown.

A trigger lever 72 is rotatably provided on the shaft 73 of the upper substrate 43, and is biased clockwise by the spring 52. A lock lever 74 is rotatably provided on the shaft 18b of the lower substrate 18 and is biased counterclockwise by a spring (not shown). The lock protrusion 74a of this lock lever 74
Locks the lock portion 72b at one end 72a of the trigger lever 72.

The locking portion 72d of the other end 72c of the trigger lever 72 is configured to lock the first and second locking portions 62c and 62d of the cam gear 62. When the trigger lever 72 is unlocked by the lock projection 74b of the lock lever 74 and is urged clockwise by the spring 52 as shown in FIG. 11, the engagement of the other end 72c of the trigger lever 72 is stopped. At the same time when the locking of the first locking portion 62c of the cam gear 62 by the stopper 72d is released, the first control portion 72c of the other end 72c of the trigger lever 72 causes the second locking portion of the cam gear 62 to move. 62d is pressed, this cam gear 62
Is rotated clockwise so that the first toothless portion 62a is brought into a meshed state from a state in which it is located in the cam drive gear 64. When the cam gear 62 meshes with the cam drive gear 64, the cam gear 62 is rotated in the clockwise direction, and the drive portion 62e rotates the forward / reverse lever 65 in the clockwise direction to change the state shown in FIG. 2 to the state shown in FIG. Move to. At the same time, the first locking portion 62c of the cam gear 62 comes into contact with the second control portion 72f of the other end 72c of the trigger lever 72 to rotate the trigger lever 72 counterclockwise against the spring 52. The locking projection 74a of the lock lever 74 is again locked, the locking part 72d locks the second locking part 62d of the cam gear 62, and the second toothless part 62b is locked by the cam drive gear. It is configured to be located at 64. A STOP rod 75 is slidably provided on the shafts 76 and 77 of the upper substrate 43, has a STOP button 78, and is biased by a spring 79 in the direction of arrow A. This ST
The tip inclined portion 75a of the OP rod 75 is configured to come into contact with the second bent portion 70d of the lock rod 70. 80 is REW
The rod 81 is slidably provided on the shaft 81 of the upper substrate 43 and the shaft 82 of the lower substrate 18, has a REW button 83, and is biased in the direction of arrow A by a spring 84. The tip 80a of this REW rod 80
The lock portion 80b of the lock rod 70 is the third bent portion 70e of the lock rod 70.
It is configured to be locked to. Also this REW rod 8
The blocking portion 80c of 0 contacts the bent portion 58a of the REW lever 58,
As shown in FIG. 2, the REW lever 58 is constructed so as to prevent the spring 61 from biasing the REW lever 58 in the counterclockwise direction. 85
Is an FF rod slidably provided on the shaft 86 and the shaft 82 of the upper substrate 43, has an FF button 87, and is biased in the direction of arrow A by the spring 84. The tip 85 of this FF rod 85
The lock portion 85b of a is configured to be locked to the locking portion 70f of the one end 70a of the lock rod 70. The blocking portion 85c of the FF rod 85 contacts the control portion 50d of the FF lever 50 to block the counterclockwise rotation biasing of the FF lever 50 by the spring 52 as shown in FIG. Has been done.
A detection lever 88 is rotatably provided on the shaft 89 of the upper substrate 43. The pressure contact portion 88a of the detection lever 88 is the shaft 8
It has an arc shape substantially concentric with 9, and is pressed against the outer peripheral portion 39c of the friction pulley 39 by a spring 90. Sliding contact protrusion 88c formed on the first arm portion 88b of the detection lever 88.
Is the outer peripheral portion of the friction pulley 39 in the operating gear 38.
The swing cam 38d provided so as to surround the 39c and the operation cam 38e formed at the outer peripheral position of the swing cam 38d are configured to be in sliding contact with each other. Second arm portion 88 of the detection lever 88
The tip portion 88e of d is configured so that the sliding contact protrusion 88c is in sliding contact with the operation cam 38e and presses the pin portion 74b of the lock lever 74 when the detection lever 88 is rotated counterclockwise. There is.

The operation of the reverse type tape recorder configured as described above will be described below with reference to the drawings.

 First, the first constant speed traveling operation will be described.

When the PLAY button 32 is pressed to slide the head substrate 29 in the direction of the arrow C against the spring 35 from the stopped state of FIG. 1, the lock rod 70 is moved to the first position as shown in FIGS. The lock portion 29f of the head substrate 29 is locked to the first bent portion 70c. When the head substrate 29 is formed in this way, the magnetic head 30 is also moved in the same manner, comes into contact with a magnetic tape (not shown), and the first pinch roller 21 is pressed against the first capstan 11. The second pinch roller 25 is the second
The bent portion 26a of the pinch roller lever 26 of the
It is blocked by the second control step portion 67d of 7 and separated from the second capstan 13. Further, the FF lever 50 is provided with the control pin on the first control portion 29d of the protruding portion 29c of the head substrate 29.
50a is controlled and rotated in the clockwise direction against the spring 52 so that the first relay gear 48 is in mesh with the reel base switching gear 44 as shown in FIGS. Therefore, the magnetic tape (not shown) of the cassette (not shown) runs at a constant speed in the direction of arrow D, and the flywheel gear 15
The clockwise rotation of the above-mentioned gears is transmitted through the operation gear 38, the felt 40, the friction pulley 39, the reel base drive gear 41, the reel base switching gear 44, the first relay gear 48, the second relay gear 53, and the reel gear 55. The first reel base 54 is rotated counterclockwise, and a magnetic tape (not shown) is wound around a reel hub (not shown) of the cassette (not shown).
It becomes a constant speed running state.

In this first constant speed traveling state, the detection lever 88 is set to the tenth position.
As shown in the figure, the swing cam 38d is rotated to a position where it can slidably contact the actuating cam 38e by the maximum length of the swing cam 38d, but the pressure contact portion 88c is in pressure contact with the outer peripheral portion 39c of the friction pulley 39. Since the sliding contact protrusion 88c slides along the swing cam 38d, the pin portion 74b of the lock lever 74 swings within a range in which the selection portion 88e of the second arm portion 88d does not press.

Next, the first constant speed traveling operation to the second constant speed traveling operation will be described.

When the magnetic tape (not shown) reaches the end from the first constant speed running state of FIGS. 2 and 4, the first reel stand 5
4, the second relay gear 53, the first relay gear 48, the reel base switching gear 44, the reel base drive gear 41, and the friction pulley 39 rotate and stand still. Although the rotation of these stops, the operating gear 38 performs a slip operation via the felt 40, so that the rotation is performed. Therefore, the detection lever 88 is rotated by the maximum length of the swing cam 38d as shown in FIG. At this time, the friction pulley
Since 39 has stopped rotating, this detection lever 88 is held in this state. When the detection lever 88 is held in the state shown in FIG. 10, the detection lever 88 comes into sliding contact with the operation cam 38e, and the detection lever 88 is rotated counterclockwise as shown in FIG.
The tip portion 88c of d presses the pin portion 74b of the lock lever 74, and the lock lever 74 is rotated clockwise. When the lock lever 74 is thus rotated, the lock of the trigger lever 72 is released, and the trigger lever 72 is rotated clockwise by the spring 52. Therefore, at the same time when the locking of the cam gear 62 is released, the first control portion 72e presses the second locking portion 62d of the cam gear 62, and the cam gear 62
Is rotated clockwise so that the first toothless portion 62c is brought into engagement with the cam drive gear 64 which is rotated counterclockwise. The cam gear 62 is the cam drive gear 64.
When it engages with, it is rotated clockwise and the drive unit 62e
By rotating the forward / reverse lever 65 in the clockwise direction as shown in FIG.
The state shown in FIG. 4 is moved to the state shown in FIG. At the same time, the first locking portion 62c of the cam gear 62 is locked by the trigger lever 72.
Of the other end 72c of the trigger lever 72c
72 is rotated counterclockwise against the spring 52 to be re-engaged with the lock convex portion 74a of the lock lever 74, and the engagement portion 72d causes the second engagement portion 62d of the cam gear 62 to move. The second toothless portion 62b is positioned on the cam drive gear 64 after being locked. The forward / reverse lever 65 is changed from the state shown in FIGS. 2 and 4 to the third state.
When moved to the state shown in the figure, the above-mentioned positive / counterlock 67 is moved to
The state shown in FIG. 3 is moved from the state shown in the figure to the state shown in FIG. 3, and the bent portion 22a of the first pinch roller lever 22 and the bent portion 26a of the second pinch roller lever 26 are connected to the forward and backward rods 67. The first and second control steps 67c and 67d control the above second
Clamp the pinch roller 25 of the to the second capstan 13
The first pinch roller 21 is separated from the first capstan 11 and the magnetic tape (not shown) is run at a constant speed in the arrow E direction. At the same time, the blocking control of the second control portion 45b of the PLAY lever 45 by the convex portion 65d of the one end 65a of the forward / reverse lever 65 is released, and the PLAY lever 45 is rotated counterclockwise by the spring 47. Therefore, the reel base switching gear 44 is disengaged from the first interruption gear 48, meshes with the third interruption gear 56, and rotates the second reel base (not shown) in the clockwise direction to rotate the second constant gear. It becomes a high-speed running state.

 Next, the stop operation will be described.

From the first constant speed running state of FIGS. 2 and 4 or the second constant speed running state of FIG. 3, the STOP button 78 is pressed to push the STOP rod 75 against the spring 79 in the direction of arrow C. When you slide this
The tip inclined portion 75a of the STOP rod 75 contacts the second bent portion 70d of the lock rod 70, and the lock rod 70 is spring 61.
The lock portion 29f of the head substrate 29 is disengaged from the first bent portion 70c by sliding it in the direction of arrow F against. Therefore, the head substrate 29 is slid in the direction of the arrow A by the spring 35 and brought into the state shown in FIG.

When the magnetic tape (not shown) reaches the end in the second constant speed running state, the detection lever 88 is actuated in the same manner as in the first constant speed running state to return to the first constant speed running state again. Needless to say.

As described above, according to the present embodiment, the operating gear 38 that is interlocked with the motor 17, and the felt 40 that is concentric with the operating gear 38 and the felt 40
A friction pulley 39 to which the rotation of the operating gear 38 is transmitted through the friction pulley 39, the friction pulley 39, and a reel base drive gear integrally formed with the friction pulley 39.
41 and the rotation of the reel base drive gear 41 as the first interruption gear.
48, a second reel gear 53, a first reel gear 55, a first reel stand 54, a third reel gear 56, a second reel gear 60, and a second reel stand (not shown). The reel base switching gear 44 to be transmitted and this reel base switching gear 44
And the first and second pinch rollers 21 and 25
A forward / backward lever 65 and a forward / backward rod 67 for performing pressure contact and separation control with respect to the first and second capstans 11 and 13 and switching between first and second constant speed running of a magnetic tape (not shown). A cam gear 62 having first and second toothless teeth 62a and 62b for driving the forward / reverse lever 65 and the forward / reverse rod 67, a cam drive gear 64 for driving the cam gear 62, and a first of the cam gears 62. Trigger lever that locks the first locking portion 62c or the second locking portion 62d of the cam gear 62 to lock the state where the toothless portion 62a or the second toothless portion 62b is located on the drive gear 64. 72, a lock lever 74 that holds the trigger lever 72 in the locked state of the cam gear 62, and a swing cam 38d at a position outside the swing cam 38d so as to surround the friction pulley 39 in the operating gear 38. The operation cam 38e is formed, and the operation cam 38e and the operation cam 38e have the sliding contact protrusions 88c that slidably contact the operation cam 38e. Pressure contact portion 8 which presses the outer peripheral portion 39c of the friction pulley 39
8a is provided, and the rotational drive by the rotational force of the outer peripheral portion 39c of the friction pulley 39 applied to the pressure contact portion 88a and the detection lever 88 which is swung by the swing cam 38d are provided, and the first or second When the first reel base 54 or the second reel base (not shown) is rotated for winding at a constant speed, that is, the friction pulley 39 is rotated, the swing cam 38d.
By the rotational drive applied to the pressure contact portion 88a, the detection lever 88 is swung within the range in which the lock lever 74 does not operate, and the first reel base 54 or the second reel base (not shown) is magnetized. When the rotation stops at the end of the tape (not shown), the friction pulley 39 also stops rotating and the pressure contact portion 88a.
When the detection lever 88 is rotated in the direction of the lock lever 74 by the swing cam 38d without being driven to rotate, it is further rotated in the same direction by the operation cam 38e to operate the lock lever 74. The constant speed running in the first or second direction is switched. Therefore, by detecting the rotation of the friction pulley 39, the first reel stand is detected.
54 or the second reel stand (not shown), and the stop of the reel stand on the take-up side can be detected at any time during the first and second constant speed runs, and the tape on the supply side sags. Even in such a state, malfunction occurs and the detection on the winding side is always performed, so that the back tension does not change and the wah performance is stable. Further, the structure is simplified, and downsizing and thinning can be realized. Further, it is inexpensive because it can be configured without using an electric switch, a solenoid or the like.

EFFECTS OF THE INVENTION The present invention relates to the first or second constant speed traveling at the first or second constant speed.
During the winding rotation of the reel base, that is, during the rotation of the second rotating body, the detection lever is swung within the range in which the holding member does not operate by the rotational drive applied to the swing cam and the pressure contact portion, When the first or second reel base and the second rotating body stop rotating at the end of the magnetic tape, the pressure contact is not rotationally driven, and the swing cam rotates the detection lever toward the holding member. After that, the actuating cam further rotates in the same direction to actuate the holding member and actuate the holding member to switch the constant speed traveling in the first or second direction. Therefore, by detecting the rotation of the second rotating body, it is possible to detect the stop of the reel stand on the take-up side at the first and second reel stands, and also during the first and second constant speed runs. Therefore, even if the tape on the supply side is slackened, malfunction does not occur and the structure is simple. Furthermore, the end point detection and the constant speed traveling can be switched without using an electric switch, a solenoid or the like, which is inexpensive.

[Brief description of drawings]

FIG. 1 is a plan view showing a stopped state of a berth type tape recorder in one embodiment of the present invention, FIG. 2 is a plan view showing a first constant speed running state, and FIG. 3 is a second constant speed running state. Fig. 4 is a plan view showing the state, Fig. 4 is a plan view of an essential part showing the first constant speed running state, Fig. 5 is a side view of Fig. 4, and Fig. 6 is a schematic sectional view showing a drive system of the reel stand. FIG. 7 is a schematic plan view showing the main parts of a magnetic tape end detection mechanism and a traveling direction switching mechanism, FIGS. 8 and 9 are front views of the same, FIGS. 10 and 11 are end detection of magnetic tape and FIG. 12 is a schematic plan view showing an operating state of the traveling direction switching mechanism, and FIGS. 12 and 13 are schematic plan views showing a conventional example. 11 …… First capstan, 13 …… Second capstan, 15 …… Flywheel gear, 21 …… First pinch roller lever, 22 …… First pinch roller lever, 25 …… Second Pinch roller, 26 …… second pinchilla lever, 29
...... Head substrate, 38 ...... Actuating gear, 38d …… Swing cam, 3
8c …… Actuating cam, 39 …… Friction pulley, 39c ……
Outer periphery, 41 ...... reel base drive gear, 44 ...... reel base switching gear, 45 ...... PLAY lever, 48 ...... first interruption gear,
50 …… FF lever, 53 …… second interruption gear, 54 …… first reel stand, 55 …… first reel gear, 56 …… third relay gear, 58 …… REW lever, 60 …… Second reel gear, 62
…… Cam gear, 64 …… Cam drive gear, 65 …… Regular lever, 67 …… Regular rod, 70 …… Lock rod, 72 …… Trigger lever, 74 …… Lock lever, 75 …… STOP rod,
88 …… Detection lever, 88a …… Pressing contact part, 88c …… Sliding contact protrusion

Claims (1)

(57) [Claims] 1. A first rotating body that rotates in conjunction with a motor, and a second rotating body that is concentric with the first rotating body and that transmits the rotation of the first rotating body via slip means. Body, a reel base drive gear integrally formed with the second rotary body, and a switching gear for transmitting the rotation of the reel base drive gear to the first or second reel base to wind the magnetic tape. And the switching operation is performed so that the switching gear is rotationally transmitted to the first or second reel base, and
The second pinch roller is pressure-bonded to and separated from the first and second capstans to separate the first and second positions so that the magnetic tape can be switched between the first and second constant speed running modes. A reciprocating switching member, and a cam gear having two toothless portions for reciprocating the switching member to first and second positions,
A drive gear for driving the cam gear, a locking member for locking the state where the toothless portion of the cam gear is positioned on the drive gear, a holding member for holding the locking member in the locked state of the cam gear, A swing cam is formed near the center of the first rotary body and so as to surround the second rotary body, and an operating cam is formed at an outer peripheral position of the swing cam, and the sliding cam is in sliding contact with the swing cam and the operating cam. It has a pressure contact portion that has a contact protrusion and is in pressure contact with the second rotating body, and is rotationally driven by the rotational force of the second rotating body applied to this pressure contact portion and is detected to be rocked by the rocking cam. A lever is provided so that the rotation of the first or second reel base during rotation of the first or second constant speed and the rotation of the second rotating body are applied to the swing cam and the pressure contact portion. Swing the detection lever by dynamic drive within the range where the holding member does not operate. When the first or second reel base and the second rotary body stop rotating at the end of the magnetic tape, no rotational drive is applied to the press contact portion and the swing cam causes the detection lever to move toward the holding member. After being rotated in the same direction, it is further rotated in the same direction by the operation cam to operate the holding member, and the constant speed running in the first or second direction is switched. Recorder.