JPH0633550Y2 - Magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing device, and more particularly to a magnetic recording / reproducing device having a simplified structure.

2. Description of the Related Art Generally, a magnetic recording / reproducing device (hereinafter, referred to as VTR) such as a video tape recorder is provided with a tape loading mechanism that pulls out a magnetic tape from a mounted tape cassette and attaches it to a rotating drum at a predetermined angle. Has been.

In addition, the VTR has a mode switching mechanism that drives the reel brake mechanism, the back tension mechanism, the swing idler lifting mechanism, etc. at appropriate timings according to the VTR mode (for example, recording mode, playback mode, fast-forward mode, etc.). It is provided.

In the conventional VTR, each of the above-mentioned mechanisms is independently driven by separately provided drive means (motors), and both are controlled by an electric control means for timing of each operation.

However, the conventional VTR requires two motors to drive the tape loading mechanism and the mode switching mechanism, which increases the product cost and reduces the size of the VTR. There was a problem that the weight could not be reduced. on the other hand,
Since the operation timing of each mechanism was controlled by the electric control means, if a failure occurs in this control means, each mechanism will perform its own operation, causing collision of the components of each mechanism, etc., resulting in damage to each mechanism. There was a problem that there is a risk of doing so.

The present invention was created in view of the above-mentioned points, and the magnetic recording / reproducing is achieved with a structure in which the tape loading mechanism and the mode switching mechanism can be driven by one driving means, thereby reducing the cost and the size and weight. The purpose is to provide a device.

Means for Solving the Problems In order to solve the above problems, in the present invention, the magnetic recording / reproducing apparatus is provided with the first and second cam members, the first and second intermediate gear members, and the cam gear.

The first and second cam members are independently displaceably mounted on the chassis, and a cam groove and a gear portion are formed, and a mechanism that operates when performing tape loading and mode switching in the cam groove. The device is connected.

The first and second intermediate gear members individually mesh with and drive the gear portions formed on the first and second cam members, respectively.

The cam gear has a first gear part formed by meshing a first intermediate gear member and a toothless portion on a part thereof, and a second gear part formed by meshing on a second intermediate gear member and partially having a toothless portion. The formed second gear portion and the third gear portion that is meshed with the drive means and is rotationally biased are coaxially and integrally formed.

Then, as the cam gear rotates, the first and second intermediate gear members face the toothless portions formed in the first and second gear portions, thereby selecting the first and second cam members. The above-mentioned mechanism / device is operated by mechanically driving.

By configuring the magnetic recording / reproducing apparatus as described above, the mechanism / device that operates when performing tape loading and mode switching can be driven by one drive means, and the first and first mechanisms for driving the mechanism / device. Since the second cam member is mechanically driven by the cam gear and driven, smooth tape loading and mode switching operation can be realized.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. Second
FIG. 3 and FIG. 3 are a plan view and a perspective view through a chassis showing a main part configuration of a magnetic recording / reproducing apparatus 1 (hereinafter referred to as a VTR) which is an embodiment of the present invention. Incidentally, FIG. 2 shows an unloading state, and FIG. 3 shows both an unloading state and an unloading state.

The VTR 1 is provided with a rotating drum 3, a supply and take-up reel stand 4,5, etc. on the chassis 2, and is roughly composed of a mechanism / device for tape loading and a mechanism / device for mode switching. There is.

First, the mechanism / device that operates during tape loading will be described.

6 and 7 are loading bases, with guide poles on top
8 and 9 and inclined posts 10 and 11 are planted, chassis 2
It is configured to move along the guide grooves 12 and 13 formed in the. The loading method of this VTR 1 is a so-called M loading method, and each loading base 6, 7 has a winding side loading link 14 (links 14a, 14b) shown in FIG.
And the supply side loading link 15 (link 15
a, 15b). The loading links 14 and 15 are driven by the displacement of the second cam plate 17, which will be described later, in the directions of the arrows A ₁ and A _{2 in} the drawing (the detailed operation of the loading links 14 and 15 will be described in the present application. Please refer to the utility model registration application “Tape loading mechanism (2)” filed on September 30, 1987 by a person).

A pinch roller 18 is rotatably attached to a pinch roller arm 19. This pinch roller arm 19 is a spindle
It is configured so as to be rotatable about 20 and the arrows A ₁ and A _{2 in} the figure of the first cam plate 16 which will be described later are loaded at the time of loading.
Driven by the directional displacement, the pinch roller 18 is rotationally displaced to a position where it comes into contact with the capstan shaft 21. Again 22
Is a loading post, which is displaced according to the rotation of the loading arm 23. The loading arm 23 is driven by a sector gear 24.

A tension pole 25 is rotatably attached to the tip of the tension arm 26. The tension arm 26 is also rotatably supported by a support shaft 27 planted in the chassis 2. A brake belt 28, which is wound around the supply reel base 4 and controls tape tension, is attached to the tension arm 26. The other end of the brake belt 28 is attached to the belt lever 28a.
This Baltic lever 28a is also engaged with the first cam plate 16 and is displaceable.

Next, the mechanism / device that operates when mode switching is described. The modes of VTR1 are play, fast forward, rewind,
Search, back search, stop, eject, record,
There are still modes, and it is necessary to operate each mechanism / device to correspond to each mode.

29 is an idler lifting mechanism that supports the swing idler 30
The upper gear part or the lower gear part formed on each reel stand 4,5 by moving up and down along 31 (each reel stand 4,5 is divided into an upper part and a lower part through a clutch mechanism as is well known. , Each of which has a gear portion formed on the outer circumference thereof, selectively engages the swing idler 30. It also has the function of forcibly engaging the swinging idler 30 toward the reel stands 4 and 5.

Reference numerals 31 and 32 denote reel lock levers, which rotate around the support shafts 33 and 34 to engage the claw portions 31a and 32a formed at the tip end with the gear portion formed on the outer circumference of the take-up reel stand 5. By doing so, the rotation is locked. The claw portion 31a is configured to engage with the upper gear portion of the take-up reel base 5, and the claw portion 32a is configured to engage with the lower gear portion.

Reference numerals 35 and 36 are brake levers, and brake pads 37 and 38 are provided at positions facing the outer peripheral surfaces of the reel stands 4 and 5, respectively.
The brake levers 35 and 36 pivotally displace to bring the brake pads 37 and 38 into contact with and separate from the reel bases 4 and 5 to brake the reel bases 4 and 5.

Reference numeral 39 is a reel brake release lever, which is configured to be rotatable around the support shaft 40, and a reel brake release pin 41 is planted at the end. The reel brake release pin 41 is inserted into the tape cassette when the tape cassette is mounted, engages with the reel brake mechanism provided in the tape cassette, and the reel brake mechanism is activated by the rotation of the reel brake release lever 39. It is operated to release the reel brake in the tape cassette.

The above-described mechanism and device that operates when performing tape loading and mode switching is connected to the first or second cam plates 16 and 17, and is driven by the first or second cam plates 16 and 17. It is configured to work (except the tension arm 26).

FIG. 4 shows the first cam plate 16 and FIG. 5 shows the second cam plate 17. The first cam plate 16 has a rack 16a formed on the upper left side and a plurality of cam grooves 42a.
~ 42e are formed. In addition, the second cam plate 17
A rack 17a is also formed in the upper left part of the, and a plurality of cam grooves 43a to 43g are formed. Each cam plate 16,17
The above-mentioned mechanisms and devices are connected to the cam grooves 42a to 42c, 43a to 43g formed in the drive groove, and driven according to the displacement of each cam plate 16 and 17 and the shape of the cam grooves 42a to 42c, 43a to 43g. It The first and second cam plates 16 and 17 have first and second intermediate gears 44 and 17 meshed with the racks 16a and 17a, respectively.
It is biased and displaced by 45.

The first and second intermediate gears 44 and 45 are driven by a cam gear 46 which is a main part of the present invention. The cam gear 46 and the first and second intermediate gears 44, 45 are the drive unit 4 shown in FIG.
Make up seven. The drive unit 47 is attached to the rear side of the chassis 2 (the attachment position is shown by a dashed line in FIG. 3).

The drive unit 47 includes the first and second intermediate gears 4 described above.
In addition to 4,45 and cam gear 46, motor 48, reduction gear mechanism 49
(Consisting of gears 49a to 49d) is mounted on the sub chassis 50. The rotation of the motor 48 is worm 51
And, the speed is reduced to a predetermined number of rotations via the reduction gear mechanism 49 and transmitted to the cam gear 46.

The cam gear 46 is formed by coaxially and integrally forming first, second and third gear portions 46a, 46b and 46c from the top on the outer peripheral portion (details are shown in FIG. 1 (B)). The first gear portion 46a meshes with the lower gear portion 44a of the first intermediate gear 44, and
The gear portion 46b of the second gear meshes with the lower gear portion 45a of the second intermediate gear 45. Further, the third gear portion 46c meshes with the gear 49d that constitutes the reduction gear mechanism 49, and the rotational force of the motor 48 is transmitted.

Further, the first and second gear portions 46a and 46b are provided with toothless portions 46a- ₁ and 46b- ₁ over a predetermined range. Therefore, the rotation of the cam gear 46 causes the lower gear portion 44a of the first intermediate gear 44 to rotate.
When facing the toothless portion 46a- ₁ and when the lower gear portion 45a of the second intermediate gear 45 faces the toothless portion 46b- _1.
Is not transmitted to the gear parts 44a and 45a, and the first and second intermediate gears 44 and 45 stop. Incidentally, the gear portion 46c in FIG.
Is formed over the entire circumference of the cam gear 46, so that the cam gear 46 makes a constant rotation by the rotating force of the motor 8. The second gear portion 46b and the third gear portion 46c except for the toothless portion 46b- _1.
Are integrally formed.

As described above, the first cam plate 16 is configured to be displaced on the upper surface side of the chassis 2, and the second cam plate 17 is configured to be displaced on the rear surface side of the chassis 2. Further, the rack 16a formed on the first cam plate 16
Is meshed with the upper gear 44b of the first intermediate gear 44 (the upper gear 44b penetrates through the opening formed in the chassis 2 and projects to the upper surface side), and is formed on the second cam plate 17. The rack 17a meshes with the upper gear portion 45b of the second intermediate gear 45. Therefore, the first and second cam plates 16, 17
Is driven by one motor 48 via a reduction gear mechanism 49, a cam gear 46, and first and second intermediate gears 44, 45. That is, the tape loading operation and the mode switching operation can be performed by one motor 48.

Also, the first and second intermediate gears 4 formed on the cam gear 46
The first and second gear parts 46a and 46b for driving the 4,45 are toothless parts 4
6a- ₁ and 46b- ₁ are formed as so-called intermittent gears, so that the displacement of the first and second cam plates 16 and 17 is caused by the toothless portion 4
The displacement is intermittent corresponding to the formation position of 6a _-1 , 46b _-1 .
The positions where the toothless portions 46a _-1 , 46b _-1 are formed are determined by the respective cam plates 16, 17
The mechanism / device connected to is configured to operate appropriately.

As described above, the drive displacement of the first and second cam plates 16 and 17 is mechanically sequenced by the cam gear 46, and the mechanism and device that operate during tape loading and mode switching are mechanically driven by the cam plates 16 and 17. Sequenced. Therefore, since the tape loading operation and the mode switching operation are all mechanically controlled, the above operations can be performed smoothly and reliably. Further, it is possible to reliably prevent damage to the mechanism / device due to a failure of the control means which may occur when the electric control means is used.

In the above embodiment, a pair of cam plates is used as a mechanism / device that operates when performing tape loading and mode switching.
Although it is configured to be driven by 17, 18, the present invention is not limited to this, and it goes without saying that a configuration using a rotary cam may be used.

Effects of the Invention As described above, according to the present invention, since the mechanism / device that operates when performing tape loading and mode switching can be driven by one driving means, the cost and size and weight of the magnetic recording / reproducing apparatus can be reduced. Since the driving displacement of each cam member is mechanically sequenced by the cam gear and the operation of the mechanism / device is mechanically sequenced by each cam member, the tape loading operation and the mode switching operation can be performed smoothly. The above mechanism that can be surely performed, and which occurs when an electric control means is used.
It has features such as reliable prevention of device damage.

[Brief description of drawings]

FIG. 1 shows a magnetic recording / reproducing apparatus (VT
R) is a view for explaining the drive unit, Fig. 2 is a plan view of the VTR, and Fig. 3 is a V seen through the chassis.
FIG. 5 is a plan view of TR (shown by a chain double-dashed line except for the second cam plate), the first cam plate of FIG. 4, and FIG. 5 is the second cam plate. 1 ... VTR, 2 ... Chassis, 6,7 ... Loading base, 14
... Winding side loading link, 15 ... Supply side loading link, 16 ... First cam plate, 16a ... Rack, 17
... second cam plate, 17a ... rack, 18 ... pinch roller, 19 ... pinch roller arm, 22 ... loading post, 25 ... tension pole, 26 ... tension arm, 28
... Brake belt, 28a ... Belt lever, 29 ... Idler lifting mechanism, 30 ... Swing idler, 31,32 ... Reel lock lever, 35, 36 ... Brake lever, 39 ... Reel brake release lever, 44 ... First intermediate gear , 45 ... Second intermediate gear, 46 ... Cam gear, 46a ... First gear part, 46a- ₁ ... Tooth notch, 46b ... Second gear part, 46b- ₁ ... Tooth notch, 46c ... Third Gear part, 47 ... Drive unit, 48 ... Motor, 49 ... Reduction gear mechanism.

Claims (1)

[Scope of utility model registration request] 1. A cam groove and a gear portion are formed on a chassis so as to be independently displaceable, and a mechanism / device which operates when performing tape loading and mode switching is connected to the cam groove. First and second cam members, and first and second intermediate gear members that individually mesh with and drive the gear portions formed on the first and second cam members, respectively. A first gear portion formed by meshing a first intermediate gear member and partly formed with a toothless portion and a second gear portion meshed with the second intermediate gear member and partially formed by a toothless portion Become second
The gear portion of the second gear is meshed with the driving means to be biased by rotation.
And a cam gear which is coaxially and integrally formed with the gear part of the first gear part, and the first and second intermediate gear members are provided with the first and second gear parts as the cam gear rotates. A magnetic recording / reproducing apparatus configured to operate the mechanism / device by selectively driving the first and second cam members by facing a toothless portion formed in the portion.