JPS6356843A - Rotary head type recording or reproducing device - Google Patents

Abstract

PURPOSE:To contrive the miniaturization of a device by arranging a position between a position corresponding to a mode where the running speed of a tape is decided by a reel driving mechanism and a position corresponding to a mode where the running speed of a tape is decided by a transfer mechanism so as to decrease the moving range of a mode lever. CONSTITUTION:An idler 70 is made to a neutral position so as to move the idler 70 up-and-down when the mode lever 17 is in the vicinity of a halt position, and the changeover of the height of the idler 70 is performed in addition to the control of a main brake when the mode lever 70 is in the halt position. Thus, the changeover whether or not a torque limiter is to be acted between a playing position and a fast feeding position is performed similarly when no other control is applied between them. Thus, the provision of any definite stop position is required, the total stroke of the mode lever 17 is decreased, and it is possible to reduce the length of the device in the longitudinal direction of the mode lever 17.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a rotary head type recording or reproducing device, particularly a tape-shaped recording medium stretched between a pair of reels, wound around a cylinder member equipped with a rotary head. The present invention also relates to an apparatus for recording or reproducing signals on the medium using the head.

<Prior art> The well-known video tape recorder (
Hereinafter, there is a VTR (hereinafter referred to as a VTR), and this VTR will be explained below as an example.

FIG. 13 is a diagram showing the configuration of a general VTR.

In the figure, 101 is a cassette, 102 is a supply reel, 103 is a take-up reel, and 104 is a magnetic tape.
It is wrapped in 03. When the magnetic tape 104 is stored in the cassette 101, the tape 104 is stretched between guide pins 100a and 100b in the cassette 101 so as to be exposed to the opening 101a of the cassette.

The stretched magnetic tape 104 (indicated by the dotted line in FIG. 13) is moved to the moving guide post 106°1.07.
．． 108. At step 109, the tape 104 is pulled out from the opening 101a and wound around a cylinder 105 having a rotary head on its circumferential surface, thereby making it possible to record and reproduce information on the tape 104. At this time, the tape path at the completion of so-called tape loading is performed by the above-mentioned moving guide post 106,
Together with 107, 108, and 109, it is determined by fixed guide posts 112, 113, and 114 that are fixed in advance to the main body of the device.

1] 5 is a loading ring, which is rotatably held along a guide member (not shown), and the loading ring] 15''- has movable guide posts 106° 107
．． 108 have been planted. Further, in the figure, Ill is a capstan for conveying the tape 104 along the tape bus, and 110 is a pinch roller that is pressed against the capstan 111. It is assumed that the pinch roller 110 and the movable guide post 109 are mounted on a rotatable lever 116, and the lever 116 is moved from the inside of the opening 101a to the illustrated position by an unillustrated mechanism.

In the VTR configured as described above, it is necessary to change the state of each mechanism in each state (mode) of the device, such as during recording/reproduction, fast forwarding, tape loading, etc. For example, reel 102. 103 driving and braking;
It is necessary to change various conditions such as driving the capstan 111 and pressing the pinch roller 110.

These can be switched by the user's operation of operation keys, but it is necessary to switch the states of each mechanism at mutually related timings.

Therefore, control can be easily performed if the members for switching the state of each mechanism are electrically independent and controlled by the system controller.

However, the motor that rotates the loading ring 115, the motor that drives the capstan 111, and even the reel 102. 103 are provided, respectively, and plungers are provided independently to press the pinch roller 110 to the capstan 111 and press the brake provided for each reel to each reel. This results in an increase in the size of the device. In addition to the above, there are many members that must be moved in each state, and if mechanisms for driving these are provided independently, a large amount of space will be required and costs will increase.

Therefore, the above-mentioned mechanism (in which the states of each mechanism are controlled by electrically independent members) cannot be used in the Pandey type VTR, where compactness and weight reduction are important.

When mechanically switching each of the above-mentioned mechanisms, the biggest challenge is to accurately determine mutual switching timing. Therefore, in recent VTRs, in order to change the state of each mechanism in all modes by mechanically interlocking, a lever with a large number of cam surfaces (hereinafter referred to as a mode lever) is used to switch the above switching. Some methods have been adopted to do this. Although this method results in a mechanically complex configuration,
It has become possible to construct a small and lightweight VTR.

<Problems to be Solved by the Invention> In a VTR, the tape is generally fast-forwarded and rewound by driving a reel, and the capstan and pinch roller are separated. Furthermore, since the tape running speed must be accurately regulated during recording playback and various special playbacks, tape running is regulated by the rotational speed of the capstan. Furthermore, in order to reduce the weight of the VTR as a whole, especially in handheld type VTRs, it is common to use a capstan motor to drive the reel.

In this type of VTR, a torque limiter is installed in the path that transmits the driving force of the capstan motor to the reel during recording and playback, and this I/L limiter is installed when fast forwarding or rewinding. 4 from within this path to drive the reels. The torque limiter is attached to and detached from the driving force transmission path by, for example, switching the connection and connection of the idler.

Now, when trying to switch the attachment/detachment state of this torque limiter to the drive force transmission path using the mode lever mentioned above, for example, the idler driven by the capstan motor can be connected to the idler connected to the reel via the torque limiter. The mode lever must be removed once, moved to that position, and then brought into contact with the idler connected to the reel without going through the torque limiter, resulting in a long stroke of the mode lever.

In addition to the two positions that require a long stroke as described above, the mode lever needs to take various positions corresponding to the various modes of the device, and accordingly, the range of movement of the mode lever must be secured. This has hindered the miniaturization of VTRs.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rotary head type recording or reproducing device that can reduce the movement range of a mode lever and downsize the device.

<Means for Solving the Problems> Under these conditions, in the present invention, a tape-shaped recording medium stretched between a pair of reels is wound around a cylinder member equipped with a rotating head, The apparatus for recording or reproducing signals on the medium with the head includes a tape loading mechanism for winding the tape-shaped recording medium around the cylinder member, and a reel drive for driving the pair of reels. a brake mechanism that brakes the rotation of the pair of reels, and a transport mechanism that directly transports the tape-shaped recording medium using the same driving force as the reel drive mechanism; The state of multiple mechanisms is determined based on the position of a slideable mode lever,
Among the plurality of possible positions of the mode lever, a position corresponding to a mode in which the running speed of the tape-shaped recording medium is determined by the reel drive mechanism, and a position corresponding to a mode in which the running speed of the tape-shaped recording medium is determined by the transport mechanism. A position corresponding to the mode in which the tape-shaped recording medium is stopped is arranged between the position corresponding to the mode.

By configuring as described above, there is no need to drive the tape in the mode in which the tape-shaped recording medium is stopped, and the position of the mode lever corresponding to this mode can be adjusted to the running speed of the tape-shaped recording medium. By placing the switch between the position corresponding to the mode determined by the wheel drive mechanism and the position corresponding to the mode determined by the transport mechanism, the state of the driving force transmission mechanism can be switched between these two positions. There is no need to change the distance between these two positions without affecting the . Therefore, the mode lever movement range can be shortened as a whole.

<Example> Hereinafter, a VTR as an example of the present invention will be described in detail.

FIG. 2 is a diagram for explaining the driving mechanism of the loading ring and mode lever in the VTR of this embodiment. In the figure, 1 is a motor, and the driving force of the motor 1 is transmitted to a gear 3 via a belt 2. 3 to 10, 12, 13, 15, and 16 are gears that are rotatable around the shaft, 11 is a slide lever that slides in the longitudinal direction in conjunction with gear 10, and 17 is a gear that can rotate as the slide lever 11 moves. Gear 15. A mode lever 16 moves through the mode lever, and 14 is a loading ring that rotates as the gear 13 rotates. Further, 185 is a supply reel stand, 18T is a take-up reel stand, 19 is a lever rotatable around a shaft 20 set on the main body of the device, 21 is a spring that biases the lever 19 clockwise, and 22 is a pin press-fitted into the lever 19, and 23 is a roller rotatably held around the bin 22.

3(A) and 3(B) are diagrams for explaining the process of transmitting the driving force of the motor 1, and FIG. 3(A) shows how the driving force of the motor 1 is transmitted to the mode lever 17. FIG. 3(B) is a diagram showing how the driving force of the motor 1 is transmitted to the loading ring 14, and the driving force transmission mechanism of the motor 1 will be explained below using this figure.

The driving force of the motor 1 is first transmitted to the gear 3 by the belt 2, and then to the gear 6 via the gear 4 and the gear 5 which rotates coaxially therewith. Gear 6, 7.8a.

8b, 8c, and 9 constitute a planetary gear unit, which supplies the rotation of gear 6 to one of gear 7 and gear 9. This rotation of gear 7 is further rotated by gear 12. The rotation of gear 9 is transmitted to loading ring 14 via gear 13, while the rotation of gear 9 is transmitted to mode lever 17 via gear 10, slide lever 11, and gears 15 and 16.

That is, this planetary gear unit transmits the rotation force of the motor 1 to one of the loading ring 14 and the mode lever 17.

Now, if the loading ring 14 is fixed, the remaining gear 7 in FIG. 3(A) does not rotate, so the gear 6
Three gears 8a pivotally supported by gear 7 due to the rotation of
8b and 8c rotate, and the rotation of these gears causes the gear 9 to rotate. The rotation of gear 9 is further transmitted to gear 10, which drives slide lever 11 via gear 15a formed on slide lever 11.

As shown in FIG. 1, the slide lever 11 has a long hole 11a.

A slide leno
1 slides in its longitudinal direction. Further, as the slide lever 11 moves, the gear 5 is rotated via the gear 15a of the lever 11, and the gear 15 further rotates the gear 16. The rotation of the gear 16 drives the mode lever 17 via a gear 16a provided on the mode lever 17. A bottle 25 set on a substrate 26 is fitted into a long hole 17b provided in the mode lever 17, and the mode lever 17 slides in the longitudinal direction in conjunction with the slide lever 11.

On the other hand, if this mode lever 17 is fixed, as is clear from the above explanation, the gear 9 shown in FIG. 3(B). Gear 10 does not rotate. Therefore, the rotation of the gear 6 causes the three gears 8a, 8b, and 8c to rotate around the gear 9, and the gear 7 rotates accordingly. The rotation of gear 7 is transmitted to loading ring 14 via gear 12 and gear 13.
A gear cut on the outer periphery of the loading ring 14 is driven, and the loading ring 14 rotates along a guide rail (not shown).

The lever 19 is moved to the mode lever 17 by the driving force of the motor 1.
This is a lever (hereinafter referred to as a switching lever) that controls switching between driving the loading ring 14 and driving the loading ring 14.The operation of this switching lever will be described below. Figure 4 is a sectional view showing the structure around the switching lever 19, and Figure 5 (A
) and (B) are diagrams showing the relationship between the loading ring 14, the mode lever 17, and the switching lever 19.

A movable kite post (for example, similar to the movable kite posts shown at 106 to 108 in FIG. 13), not shown, is installed in the loading ring 14, and by rotating the loading ring 14 clockwise, the tape can be removed. Once loading is complete, tape loading can be canceled by rotating counterclockwise.

As will be described later, the mode lever 17 can take various positions depending on the mode of the VTR, but the state shown in FIG. 5(A) is the tape loading mode, and the state shown in FIG. 5(B) is the tape loading mode. The previous mode in FIG. 1 corresponds to the mode after tape loading is completed.

Now, in the state before tape loading shown in FIG. 14b into the recess 14b+. When the motor 1 is rotated clockwise in this state, the loading ring 14 moves between the bottle 19a and the recess 14b.
Since the slide lever 11 is fixed by +, the slide lever 11 slides in both directions 1 in the figure, and along with this, the mode lever 1
7 slides to the left in the figure. When the mode lever 17 moves until the bin 22 press-fitted into the switching lever 19 is positioned above the cam 17a of the mode lever 17 in the figure, the biasing force of the spring 21 causes the bin 22 to fall into the recess of the cam 17a. . Accordingly, the load required to move the mode lever 17 becomes larger than the load required to rotate the loading ring 14. Therefore, the loading ring 14 becomes rotatable due to the action of the planetary gear unit described above. At this time, when the motor 1 is further rotated clockwise, the loading lever 14 is rotated clockwise to perform tape loading.

At this time, the loading ring 14 transitions from the state shown in FIG. 5(B) to the state shown in FIG. 5(A). When tape loading is completed, the moving guide post on the loading ring 14 is locked by a catching member (not shown). As a result, the loading ring 14 is in the state shown in FIG. 5(A), that is, the cam 1
The pin 19a cannot further rotate clockwise from the state where it faces the recess 14b2 of the pin 4b. Although the load to slide the mode lever 17 is large here, when the motor 1 further rotates clockwise, the pin 22 is moved by the spring 2.
1, the pin 19a is pushed upward in the figure along the slope of the recess of the cam 17a, and the pin 19a sinks into the recess 14b2. As a result, the mode lever 17 can be slid as the motor 1 rotates in the state shown in FIG. 2, and the mode lever 17 can take positions corresponding to a plurality of modes when tape loading is completed.

Conversely, when the motor 1 is rotated counterclockwise from the state shown in FIG. 2, the mode lever 17 moves to the right. When the mode lever 17 moves to the state shown in FIG. 5(A), the pin 22 retracts into the cam 17a, and the loading ring 14 becomes rotatable (counterclockwise). When the motor 1 is further rotated counterclockwise, the loading ring 14 is rotated counterclockwise and tape loading is released. When the loading ring 14 rotates to a position where the pin 19a faces the recess 14b1, the movable guide post on the loading ring 14 is locked by a mechanism (not shown), and the unloading state is returned. At this time, when motor l is further rotated counterclockwise, pin 22
is pushed up along the slope of the cam 17a, resulting in the state shown in FIG. 5(B). As a result, the mode lever 17 can be slid by rotating the motor 1 in the state shown in FIG.
7 is possible.

Next, the function of the mode lever 17 in this embodiment and the possible positions of the mode lever 17 will be explained.

FIG. 6 is a block diagram showing a motor control circuit depending on the position of the mode lever 17.

The mode lever 17 has various cams 17c and 17d.

17e, 17f, 17g, 17h, 1
7i is formed and teed. The function of each cam will be explained in detail later, but these functions are performed by the mode lever taking a plurality of positions. According to the VTR of this embodiment, the mode lever 17 has eight positions, which are shown in order from the right side in FIG. The play position, reverse search position, and eject position are the eject position of the cassette holder to take out the cassette installed in the device main body, and the take-up position is the position immediately after the cassette holder is installed in the device main body. This is the position when the tape 4 is running, and the above is the position when the tape is in the unloading state.

The loading position is a position during tape loading or unloading. The other four positions are the positions when tape loading is completed, the fast forward position is the position when the VTR is fast forwarding or rewinding the tape, and the stop position is the position when the VTR is in the cassette position. The position when the device is stopped and the play position is the position when the VTR is performing recording playback or various special playbacks (including forward high-speed search) excluding reverse high-speed search, and reverse search position. is VTR
is the position when performing a high-speed reverse search.

In FIG. 6, 27b is a pattern formed on the mode lever 17, and a conductive layer is formed in the shaded area in the figure.

These are four brushes 27a fixed to the device main body 26.
The data is read by the system controller SC and supplied as 4-bit binary information to the system controller SC.

The pattern 27b has nine 4-bit patterns formed on the mode lever so that their boundaries correspond to the eight positions. The mode lever 17 is indicated by the arrow 27c in the figure.
It moves in the direction shown in , but along with this, pattern 27b
The position of the mode lever 17 is always recognized by the system controller SC.

As is well known, the operation section 28a controls recording, playback, and stop.

Instructs to eject, etc. by manual operation and supplies it to the item controller SC.

The system controller SC controls the first motor control circuit Ml and the second motor control circuit M2 based on the data from the brush 27a1, the operating section 28a1, and the cassette mounting detector 28b.
supply control data to. The first motor control circuit Ml is a circuit that controls the aforementioned motor l, and the second motor control circuit M2 is a circuit that controls a capstan and reel driving motor, which will be described later. For example, when a cassette is inserted into the main body of the apparatus, the system control roller SC receives data from the cassette loading detector 28b and controls the motor l so that the mode lever 17 moves from the cassette-in position to the stop position. Data is supplied to the first motor control circuit based on the output of the brush 27a. Furthermore, when a playback command is issued from the operation unit 28a in this state, the mode lever 17 is supplied to the first motor control circuit M1 so as to move from the stop position to the play position, and
Data for conveying the tape l at a predetermined speed is supplied to the second motor control circuit M2.

Next, the action of each cam provided on the mode lever 17 will be explained individually.

FIG. 7 is a diagram for explaining the action of the eject control cam 17g. In the figure, the same components as in FIG. 2 are given the same numbers. The mode lever 17 shown in FIG. 7 is in the eject position. 33 in the figure is an eject lever in a cassette holder mechanism (not shown), which is biased upward in the figure by a spring 34. When the mode lever 17 moves from a position other than the eject position to the eject position, the eject control cam 17g presses the end of the T-shaped lever 31, which is rotatable about the shaft 30, and rotates it clockwise. Accordingly, the T-shaped lever 31 moves from the position shown by the dotted line in the figure to the position shown by the solid line, and the eject lever 33 is pressed downward in the figure to cause the cassette holder to eject.

The eject command by the operation unit 28a can be issued when the VTR is in any mode except during recording, and the eject operation is performed by moving the mode lever 17 to the rightmost eject position. In addition, 3
2 is a stopper and is a T-shaped lever 31 when the mode lever 17 is in a position other than the eject position. The position of the eject lever 33 is regulated.

Next, reel lock control → 8th section regarding the action of the cam 17c.
This will be explained using FIG. Figure 8 shows the VT of this example.
FIG. 9 is a diagram showing the cassette used in R, and is a diagram showing the action of the reel lock control cam 17c.

In FIG. 8, 35 is the cassette body, 36 is the supply and take-up reel, 37 is a lid for protecting the tape inside the cassette, 38 is a hole into which a reel lock control pin, which will be described later, is inserted, and 39 is a hole for inserting a reel lock control pin, which will be described later. A reel lock control lever 40 is a reel lock member that is interlocked with the reel lock control lever 39. In the illustrated cassette, a pair of reel lock members mesh with gears 36a integrally attached to the pair of reels 36, thereby inhibiting rotation of the pair of reels 36. Then, when the reel lock control lever 39 is pressed upward in the figure, the reel lock member 40 is also shifted upward, the meshing is released, and the reel lock is released.

The mode lever 17 shown in FIG. 9 is in the cassette-in position. 42 is a lever rotatable around a pin 41 set on the base plate 26, and 43 is a reel lock release lever rotatable around a pin 44.

The reel lock release lever 43 is biased clockwise by a spring 46 suspended from a hook 43a, and the lever 42 is accordingly biased counterclockwise.

When the mode lever 17 slides from the cassette-in position to the left in the figure and moves to the winding position, the levers 42 and 43 rotate from the position shown by the solid line in the figure to the position shown by the chain line in accordance with the movement of the reel lock control cam 17c. . Correspondingly, the reel cock release pin mounted on the end 43b of the reel lock release lever 43 moves upward in the figure, and releases the reel lock by operating the reel lock control lever 39 of the cassette 35 described above.

As is clear from the shape of the reel lock control cam 17c,
This reel lock is released when the mode lever 17 is at any position between the aforementioned winding position and the reverse search position, allowing the pair of reels 36 to rotate.

Next, the action of the take-up side sub-brake control cam 17f will be explained using FIG. 10. 47 is a sub-brake pad on the winding side, and this pad is attached to one end of a lever 46 that is rotatable around a pin 46a. The lever 46 is biased clockwise by a spring 48 suspended from its hook-shaped portion, and the take-up side sub-brake control cam 17 is attached to the other end.
A pin 46b that contacts f is planted. The mode lever 17 shown in FIG. 1O is in the loading position, and only at this time the pin 46b is recessed into the recess of the cam 7F, and the para l-' 47 comes into contact with the brake shoe 18Ta. During tape loading and unloading, rotation of the take-up reel stand 18T is prohibited, and movement of the tape 4 in the longitudinal direction during tape loading and unloading is prohibited.

Further, this sub-brake on the take-up side does not work due to the action of the cam 17f when the mode lever 17 is in a position other than the loading position.

FIG. 11 is a diagram for explaining the action of the pinch roller crimping control cam 17h. Before explaining the action of the cam 17h, the mechanism for moving the pinch roller 56 will be explained first. 50 is a gear that meshes with a gear provided on the outer periphery of the loading ring 14, 51 is a gear provided concentrically and integrally with the gear 51, and is provided on the outer periphery of a lever 52 that rotates around a shaft 52a. mesh with the gear. When the loading ring 14 rotates clockwise and the tape 4 is pulled around a ring member (not shown) by a moving guide post provided on the ring 14, the lever 52 rotates clockwise and moves. Move the guide post 53 from the opening of the cassette to the position shown. This completes the tape loading, and the mode lever 17 then moves further to the left from the loading position, resulting in the state shown in the figure.

FIG. 11 shows a case where the mode lever 17 is in the fast forward position.

55 is the capstan, 56 is the pinch roller, and now,
A magnetic tape (not shown) is arranged between these. The pinch roller 56 is rotatable about the movable guide post 53 and is pivotally supported at the tip of a lever 54 that is biased counterclockwise. 57. 58. 59 are rotating levers, and the rotating lever 57 is connected to the pin 57a1Do.
8.59 is rotatable around the pin 62. Lever 5
8 is biased counterclockwise by a spring 63 suspended from the hook portion 58a, and the lever 57 that interlocks this is biased clockwise.

Further, the lever 59 is biased clockwise by a spring 61 suspended between the hook portions 59a and 58b.

The pinch roller crimping control cam 17h is formed by providing a thick part on the mode lever +7.
7 is configured to rotate in two stages.

When the mode lever 17 is to the right of the loading position, the lever 57 is at its most clockwise position, and accordingly, the lever 59 is at its most counterclockwise position. When the mode lever 17 moves from this state to the fast forward position, the lever 57 is slightly rotated counterclockwise by the cam 17h, and the lever 59 is accordingly rotated slightly clockwise. At this time, the tips of the five levers press the pinch roller shaft to bring the pinch roller 56 closer to the capstan 55. This is to reduce the stroke of the mode lever 17 for crimping the pinch roller 56 as much as possible, and to prevent the tape from contacting the end of the cassette opening and being damaged during tape fast forwarding, the guide post 60 installed on the lever 59 allows the tape to It is done with the purpose of shifting the pass inward.

When the mode lever 17 further moves to the left from this state and reaches the play position, the lever 57 is further rotated counterclockwise by the cam +7h, and the five levers are also further rotated clockwise. As a result, the pinch roller 56 is pressed against the capstan 55. Of course, when the mode lever 17 is in the reverse search position, the pinch roller 56 is pressed against the cab stan 55 in the same way.

Next, the action of the main brake control groove cam 17d will be explained using FIG. 1(A). The grooved cam 17d is formed by providing a hole in the mode lever 17.
A bottle 65b mounted on the lever 65 is fitted into the grooved cam 17d. The lever 65 is rotatable around a pin 65a, and the pin 65 installed at the tip of the lever 65
c is fitted into four parts 66b provided on the shift lever 66. A long hole 66a is formed in the shift lever 66, and a pair of bins 67a and 67b mounted on the base plate are fitted into the long hole 66a. Along with this, the shift lever
66 is shiftable in the vertical direction in the figure.

FIG. 1(A) shows the state when the mode lever 17 is in the stop position, and when it is in this position, the lever 65 is turned counterclockwise and is in a supported position compared to when it is in other positions. Accordingly, the shift lever 66 is moved upward in the figure, and the bin 66c is also located upward.

67S and 67T are main brake levers on the supply side and take-up side, respectively, and are connected to each other by springs 68.
The brake pad is biased in the direction in which it comes into contact with the S and 18T brake shoes. That is, the lever 67S is biased counterclockwise, and the lever 67T is biased clockwise.

When the mode lever 17 is in a position other than the stop position, the pin 66c pushes down the inner end of the brake lever 675, 67T to release the brake, but when the mode lever 17 is in the stop position, both main brakes are activated as shown in the figure. It is configured to work.

In FIG. 1(A), 73 is a belt that transmits the driving force from the capstan motor that drives the capstan 55, and the roller 72 is driven by this belt. An idler 75 is press-fitted into the shaft 72a together with the roller 72, and an idler 70 rotatable about the shaft 70a is attached to the idler 75.

A lever 71 is rotatable around a shaft 72a, and its end supports the shaft 70a. If the shift lever 66 is not present in the above configuration, when the roller 72 is rotated clockwise by the drive belt 73, the leno\-71 is rotated clockwise and the idler 70 is attached to the idler 69S. Then, when the roller 72 is further rotated clockwise,
The rotation is transmitted to the supply reel stand 1.83 via the idler 754, the idler 70, and the idler 69S, causing the supply reel to rotate counterclockwise. Similarly, when the roller 72 is rotated counterclockwise by the drive belt 73, the idler 70 is attached to the idler 69T, and the take-up reel stand 18T is rotated clockwise.

Now, when the mode lever 17 is in the stop position, the shift lever 66 is soft upward, and the shaft 70a of the a/r driver 70 is retracted into the receiving part 66d of the shift lever. This restricts the rotation of the lever 71, and the idler 70 assumes a neutral position in which it cannot come into contact with either the idler 69S or the idler 69T.

The disadvantages of arranging the idler 70 in the neutral position in this way will be explained below.

In the VTR of this embodiment, the tape is driven only by directly driving the reel when fast forwarding and rewinding the tape. On the other hand, during recording and playback, the tape speed is determined by the capstan, and the reel is driven via a torque limiter (hereinafter referred to as limiter). In this embodiment, this limiter is provided in the idlers 69S and 69T, respectively, and the idlers 69S and 69T are provided with idlers 69Sa and 69Ta that are not directly driven, and idlers 69Sb and 69Tb that are used to generate zero force through the limiter. It has become a two-layer structure. Therefore, the attachment position (height) of the idler 70 with respect to the idlers 69S and 69T in FIG.
It is necessary to temporarily separate it from 69T. Therefore, when the mode lever 17 is at the stop position between the fast forward position and the play position, the idler 70 is placed at the above-mentioned neutral position.

The above-mentioned control of the attachment position of the idler 70 is performed by the action of the idler height control groove cam 17e.

FIG. 1(B) is a diagram for explaining the action of this idler height control cam 17e, and FIG. 1(C) is a sectional view showing a mechanism for switching the idler height. Figure 1 (B).

In (C), the same crosspieces as in FIG. 1(A) [the same numbers are given to the elements.

FIG. 1(B) shows the state when the mode lever 17 is in the play position. 80 is a lever that can be rotated around a pin 80a;
b is fitted into the groove cam 17e. The lever 80 rotates counterclockwise while the mode lever 17 moves from the fast forward position to the play position. 81 is a pin 82 planted on the board
A and 82b are shift members that can be shifted in the vertical direction in the figure by fitting into the elongated hole 81b. The shift member 8
A pin 80c mounted on the lever 80 is fitted into a recess 81c provided in the recess 81c, and as the lever 80 rotates, the shift member 81 shifts.

The shift member 81 has a long hole 8 shaped as shown in FIG. 1(C).
1d is formed, and a pin 85 is fitted into the elongated hole 81d. The pin 85 is fixed to rotating levers 84a and 84b that are rotatable about the shaft member 83, and is press-fitted into the lever 71. When the shift member 81 shifts upward in the figure, the levers 84a and 84b rotate counterclockwise in FIG. 1(C), and the lever 71 lifts the idler 70. On the other hand, as shown in FIG. 1(B), when the shift member 81 shifts downward in the figure, the lever 84a.

84b is shown in FIG. 1(C), the levers 84a and 84b rotate clockwise, and the lever 71 pushes down the idler 70.

Therefore, when the mode lever 17 is on the left side of the play position, the shift member 81 is on the lower side in the figure, so the height of the idler 70 is at a low position, corresponding to the height of the idler 69Tb in FIG. 1(C). On the other hand, mode lever 17
When is on the right side of the fast forward position, the shift member 81 is at the top in the figure, so the height of the idler 70 is at a high position.
The height corresponds to the idler 69Ta in FIG. 1(C). Therefore, when the idler 70 is attached to the idlers 69S and 69T, it is possible to switch between driving via a limiter and driving directly. This switching is performed when the mode lever is near the stop position, and at this time, the idler 70 is changed to the idler 69S by the action of the shift lever 66.

69T. Therefore, the height of the idler 70 can be changed extremely smoothly.

Finally, using Fig. 12, the soft brake control cam 17
The effect of i will be explained. Figure 12 shows mode lever 1
7 is a diagram illustrating a state where 7 is at a reverse search position. 9
2 is a lever that can be rotated around a pin 90;
It is biased clockwise by a spring 93 suspended between 2a and a pin 94 set on the substrate. Reference numeral 92a is a pin that is set on the lever 92 and comes into contact with the cam 17i.The pin 92a and the cam 17i rotate the lever 92 counterclockwise only when the mode lever is in the play position, and the soft brake pad is rotated. 91 is released from contact with the brake shoe 18a of the take-up reel stand 18T.

This soft brake is especially provided to compensate for insufficient back tension during high-speed searches in the reverse direction. However, since the soft brake does not have an adverse effect during fast forwarding or rewinding, it is only necessary to release the soft brake when the mode lever 17 is in the play position.

In the VTR of the above-described embodiment, when the mode lever 17 is at the above-mentioned stop position, the idler 70 is set at the neutral position, and the idler 70 can be moved up and down.
When the mode lever 17 is near the stop position, the height of the idler 70 can be switched separately from controlling the main brake. As a result, switching between the play position and the fast-forward position as to whether or not to apply the torque limiter is performed in the same manner as in the case where no other equivalent control is performed between these positions. Therefore, there is no need to provide a separate stop position for the mode lever 17, the total stroke of the mode lever 17 can be shortened, and the device can be downsized in the longitudinal direction of the mode lever 17.

Furthermore, when the mode lever 17 is at the above-mentioned stop position, both idlers 18S and 18T are fixed by the main brakes 67S and 67T, so the idler 70 is not displaced to either of the idlers 69S and 69T. This is desirable from the perspective of the load on the tape.
This means that the function of the mode lever can be realized with absolutely no waste.

<Effects of the Invention> As described above, according to the present invention, the movement range of the mode lever can be reduced as a whole, and accordingly, the device can be downsized.

[Brief explanation of drawings]

Figure 1 (A) is a diagram for explaining the action of the main brake and idler control cam in a VTR as an embodiment of the present invention, and Figure 1 (B) is the action of the idler height control groove cam. FIG. 1 (C) is a diagram showing an idler height control mechanism, and FIG. 2 is a diagram explaining a loading ring and mode lever drive mechanism in a VTR as an embodiment of the present invention. Figure 3 (A) and (B) are the diagrams for motor 1 in Figure 1.
Figure 4 is a diagram for explaining the process of transmitting the driving force in Figure 1.
5(a) and 5(B) are diagrams showing the relationship between the loading ring, mode lever, and switching lever in FIG. 1, and FIG. 6 is a mode diagram showing the structure of the switching lever. FIG. 7 is a block diagram showing a motor control circuit depending on the position of the lever; FIG. 7 is a diagram for explaining the function of the eject control cam; FIG. 8 is a diagram showing a cassette used in the VTR of this embodiment; Figure 9 is a diagram to explain the action of the reel lock control cam, Figure 10 is a diagram to explain the action of the take-up side sub-brake control cam, and Figure 11 is a diagram to explain the action of the pinch roller crimping control cam. , FIG. 12 is a diagram for explaining the action of the soft brake control cam, and FIG. 13 is a diagram showing the configuration of a general VTR. 14・・・・・・・・・・・・・・・・・・・・・
...Loading ring, 17...
・・・・・・・・・・・・・・・・・・・・・・・・
...Mode lever, 18S, 18T...
・・・・・・・・・Reel stand, 55-・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・ Capstan, 56・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
・・Pinch roller, 66・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
...Shift lever-167S, 67T...
・・・・・・・・・・・・・・・・・・・・・・・・
・・・Main brake, 69Tb, 69Ta...
・・・・・・・・・・・・・・・・・・Idler, 7
0・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・Idler, 71・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・Rotating lever, 72・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・ Laura, 73・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・Held, 80・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・
Rotating lever, 81...
・・・・・・・・・・・・・・・・・・・・・・・・
...Shift member.

Claims (1)

[Claims] An apparatus in which a tape-shaped recording medium stretched between a pair of reels is wound around a cylinder member having a rotating head, and a signal is recorded on or reproduced from the medium by the head, the recording medium comprising:
a tape loading mechanism for winding the tape-shaped recording medium around the cylinder member; a reel drive mechanism for driving the pair of reels; a brake mechanism for braking rotation of the pair of reels; and a brake mechanism for braking the rotation of the pair of reels. A configuration including a plurality of mechanisms including a transport mechanism that directly transports the tape-shaped recording medium using the same driving force as a drive mechanism, and the state of the plurality of mechanisms is determined based on the position of a slideable mode lever. Among the plurality of possible positions of the mode lever, a position corresponding to a mode in which the running speed of the tape-shaped recording medium is determined by the reel drive mechanism, and a position corresponding to a mode in which the running speed of the tape-shaped recording medium is determined by the transport mechanism. A rotary head type recording or reproducing apparatus characterized in that a position corresponding to a mode in which the tape-shaped recording medium is stopped is arranged between a position corresponding to a mode to be determined and a position corresponding to a mode to be determined.