JPH0245253B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and an object of the present invention is to minimize changes in the tape path when a pinch roller is pressed against a capstan shaft with a predetermined pressing force at the start of tape running. do.

In conventional magnetic recording and reproducing devices, the pinch roller is disposed close to the capstan shaft, and when running the magnetic tape, a double-acting lever for pressing the pinch roller is driven by a solenoid motor, etc., and the pinch roller is pressed to a predetermined level. It used a method of crimping it onto the capstan shaft using pressure.

As a result, a tape path difference (sag of the tape) occurs when the pinch roller is pressed, resulting in a tape position shift, making it difficult to edit the tape accurately. Furthermore, since a large impact force is applied to the tape during pinch roller pressure bonding, there is a drawback that the tape may be twisted and damaged.

The present invention eliminates these drawbacks, and aims to provide a magnetic recording/reproducing device that has fewer tape path changes and less tape twisting and damage.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. Figure 1 shows a VHS video tape recorder (VTR) which is an embodiment of the present invention.
2 and 3 are operational explanatory diagrams of the main parts of the apparatus, and FIGS. 4 and 5 are exploded perspective views of the same parts.

In the figure, 20 is a magnetic tape pulled out from a VHS cassette 21, 22 is a supply reel stand, and 35
23 is a tension post that is rotatably supported on the chassis; 24 is a P1 post that is rotatably supported on a fixed shaft (not shown) installed in the chassis; 25 is a gold plate; Width erase head, 26,
Reference numeral 29 is a height regulating post for drawing out the magnetic tape 20 from the cassette 21, and 27 and 28 are inclined posts installed opposite to the height regulating posts 26 and 29.

30 is an impedance roller rotatably supported by the chassis; 31 is an audio oil race head; 32 is an audio control head; 33
14 is a magnetic resistance type head (MR head), 34 is a P4 post, 36 is a cylinder equipped with a rotating head (not shown), and 14 is a pinch roller that can press against and separate from the capstan 15 in order to run or stop the magnetic tape 20. be.

Reference numeral 6 denotes a slide lever 3 that is guided by fixed shafts 1 and 2 implanted on a sheet metal base (not shown) and is slidable in the directions of arrows A and B, and a fixed shaft implanted on the slide lever 3. 4 and an auxiliary slide lever 5 that is guided by the fixed shaft 1 and is slidable in the directions of arrows A and B. Further, the slide lever 3, the auxiliary slide lever 5, and the tension spring 6 constitute an auxiliary double-action lever. The auxiliary slide lever 5 is always urged in the direction of arrow A by the spring 6 and is in contact with the shaft 4.

A main double-acting lever consisting of a pinch lever 7, a pressure lever 8, and a tension spring 9 is rotatably supported by a fixed shaft 10 implanted on a sheet metal base.

11 is a fixed shaft installed in the sheet metal base,
The fixed shaft 11 rotatably supports a pinch roller arm 12 that rotatably supports a pinch roller 14 . 13 is implanted in the pinch roller arm 12,
This is a lock pin that comes into contact with a protrusion provided on the slide lever 3. 16 connects the pinch lever 7 to the spring 9
The pinch roller 14 rotates counterclockwise against the
This is a pinch solenoid for strongly pressing the magnetic tape 20 against the capstan 15 and causing the magnetic tape 20 to run.Next, the operation of this device will be explained.

When switching to magnetic tape loading mode,
The magnetic tape 20 is pulled out from the cassette 21 by the entrance height regulating post 26, the entrance inclined post 27, the exit height regulating post 29, and the exit inclined post 28 as shown by arrow C, and is placed in the cylinder 3 as shown in FIG. It can be wrapped like this. In this state, the magnetic tape 20 has already been connected to the tension post 23, P1 post 24, full erase head 25, impedance roller 3, audio erase head 31, audio/control head 32, and MR head 3.
3. It is wrapped around the P4 post 34 at a predetermined angle.

Immediately before the magnetic tape 20 is wound around the cylinder 36, the pinch roller 14 is driven toward the capstan shaft 15 in the direction of arrow D, and almost at the same time as the winding of the magnetic tape 20 around the cylinder 36 is completed, the pinch roller 14 is moved toward the capstan shaft 15. 15 with a light force. However, in this state,
Since the pressing force is low, the rotation of the capstan 15 is not transmitted to the magnetic tape 20, and therefore the magnetic tape 20 is not driven. Next, when switching to the magnetic tape running mode, the pinch roller 14 is pressed against the capstan shaft 15 with a strong force, and the magnetic tape 20 is driven for the first time at this point.

The operation during this time will be explained in more detail using FIGS. 2 and 3.

When switching to magnetic tape loading mode,
The slide lever 3 is driven in the direction of arrow A, and the slide lever 3 pushes the pinch pin 13 implanted at one end of the pinch roller arm 12, which is rotatable around the fixed shaft 11, and is attached to the other end of the pinch roller arm 12. The pinch roller 14 is attached to the fixed shaft 1
1 in a counterclockwise direction to approach the capstan shaft 15.

On the other hand, as the slide lever 3 moves, the auxiliary slide lever 5 moves further in the direction of arrow A while being in contact with the shaft 4 due to the tension spring 6, and comes into contact with the pinch lever 7 at the folded portion a. By pressing part b, the main double-acting lever consisting of the pinch lever 7, the pressure lever 8 and the tension spring 9 is rotated counterclockwise about the shaft 10.

The boss portion of the pinch roller arm 12 is pushed by the pressure lever 8, and the pinch roller 14 comes into light contact with the capstan shaft 15. When the slide lever 3 is further driven in the direction of arrow A, the slide lever 3 moves in the direction of the arrow Although it moves in the direction A, the auxiliary slide lever 5 is prevented from moving in the direction of the arrow A by the pinch lever 7, and as a result, the tension spring 6 is expanded. At this time, the auxiliary slide lever 5 is moved by the pinch lever 7 due to the elastic force of the tension spring 6.
is pushed in the direction of arrow A, and the pinch roller 14 is lightly pressed against the capstan shaft 15 to the extent that the magnetic tape 20 does not run.

Next, when switching to the magnetic tape running mode, the pinch solenoid 16 is turned ON, only the pinch lever 7 rotates counterclockwise around the shaft 10, and the tension spring 9 is extended, and its elastic force causes the The pusher lever 8 presses the boss portion of the pinch roller arm 12, and as a result, the pinch roller 14 is pressed by the rotating capstan shaft 15, thereby removing the magnetic tape sandwiched between the pinch roller 14 and the capstan shaft 15. 20 is driven.

In this way, in this embodiment, before obtaining a predetermined strong pressure force for driving the tape, the pinch roller is pressed against the capstan shaft with a weak pressure force by the double-acting lever, so that the predetermined strong pressure force is not obtained. It is possible to reduce the tape path difference that occurs when obtaining the tape and the impact force applied to the tape.

As described above, according to the present invention, the impact when the pinch roller presses against the magnetic tape is extremely small almost at the same time as loading is completed.
Since the magnetic tape does not sag due to impact, everything from loading to running of the magnetic tape is carried out smoothly, and highly accurate editing can be performed. In addition, when moving from the point at which the loading of the magnetic tape is completed to the time when the magnetic tape starts running, the transition can be made by simply moving the pinch roller slightly, so the tape path can be minimized. For example, when obtaining a playback image, it is possible to immediately obtain This makes it possible to easily achieve highly accurate editing.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a VTR which is an embodiment of the present invention, Figs. 2 and 3 are operational explanatory diagrams of the main parts of the device, and Figs. 4 and 5 are exploded perspective views of the same parts. It is. 1...Axis, 2...Axis, 3...Slide lever,
4... Shaft, 5... Auxiliary slide lever, 6... Tension spring, 7... Pinch lever, 8... Pressure lever, 9... Tension spring, 10... Shaft, 11...
...shaft, 12...pinch roller arm, 13...tight pin, 14...pinch roller, 15...capstan shaft, 16...pinch solenoid, 20...
...Magnetic tape, 21...VHS cassette, 2
2... Supply side reel stand, 23... Tension post, 24... P1 post, 25... Full width erase head, 26... Input side height regulation post, 27...
Entrance side inclined post, 28...Exit side inclined post, 29
...Exit height regulation post, 30...Impedance roller, 31...Audio oil race head,
32...Audio/control head, 33
...MR head, 34...P4 post, 35...take-up reel stand, 36...cylinder.

Claims (1)

[Claims] 1. A magnetic head that comes into contact with the magnetic tape, a rotating capstan, a pinch roller that presses the magnetic tape against the capstan and causes the magnetic tape to run, and a magnetic head that brings the magnetic tape into contact with the magnetic head. a tape loading mode and a magnetic tape running mode for running the magnetic tape, and in the magnetic tape loading mode, the pinch roller is held at a first position separated from the capstan while the magnetic tape is being loaded. Then, almost at the same time as the mode is completed, the pinch roller is pressed and held against the magnetic tape from the separated first position to a second position where the rotational force of the capstan is not transmitted to the magnetic tape. At the same time, in the magnetic tape running mode, the pinch roller position regulating means is configured to move the pinch roller to a third position where the pinch roller is brought into pressure contact with the capstan and transmit the rotational force of the capstan to the magnetic tape. A magnetic recording/reproducing device characterized by: