JPH04221451A - Magnetic recording and reproducing apparatus - Google Patents

Abstract

PURPOSE:To offer a magnetic recording and reproducing apparatus whose performance can be ensured for a long time without requiring any labor by a method wherein a simple device is added. CONSTITUTION:A roller 25 for cleaning use is brought into pressure contact with a face other than the contact face of a pinch roller 13 at a capstan shaft 2 only during the extraction action of a magnetic tape 12. Thereby, it is possible to restrain magnetic powders from adhering to the capstan shaft 2. Since the capstan shaft is cleaned whenever the tape is loaded, the performance of an apparatus can be kept for a long time.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus for recording and reproducing analog or digital video signals or audio signals.

0002

[Prior Art] A conventional magnetic recording/reproducing device is shown in FIGS. 7 to 10.
I will explain about it. FIG. 7 is a cross-sectional view showing the pinch arm separated from the capstan shaft, FIG. 8 is a cross-sectional view showing the pinch arm being rotated by the drive mechanism and pressed against the capstan shaft with the magnetic tape sandwiched between them. Figure 1 is a schematic configuration diagram showing the state in which the magnetic tape is in the cassette.
0 is a schematic configuration diagram showing a state in which a magnetic tape is pulled out from inside a cassette by a tape guide and wound around a cylinder.

In FIG. 7, 1 is a capstan body; 2 is a capstan body;
3 is a capstan shaft, 3 is a holder, 4a and 4b are bearings that are fixed to the holder 3 and hold the capstan shaft 2 in rotation, 5 is a flywheel that is fixed to the capstan shaft 2 by a bush 6, and 5a is a flywheel 5. A rotor magnet is fixed to the holder 3 and rotates the flywheel 5 by receiving the magnetism generated by the coil 7; 8 is a substrate fixed to the holder 3 and holds the coil 7 and supplies power; 9 supports the holder 3; 10 is a positioning shaft that is set up on the base 9 and maintains the position and height of the tape cassette 11 containing the magnetic tape 12 on the base 9; 13 is a pinch roller; 15 A pinch arm is rotatably fitted and held on a shaft 14 installed on the base 9, and a pinch roller 13 is rotatably fixed to a pin 15a provided at the tip of the pinch arm.

Next, the operation will be explained. Cassette 11
When the cassette 11 is loaded into the apparatus, the cassette 11 is mounted at a position on the base 9 shown in FIG. 9 by a cassette mounting device (not shown). At this time, the capstan body 1 connects the recess 11a provided on the side surface of the cassette 11 with the magnetic tape 1.
It will fit between the two. When a command is issued to put the device into an operating state such as playback by operating the device itself,
The tape guides 19 and 20 guide the magnetic tape 12 into the cylinder 1 from the positions shown in FIG. 9 through guide grooves 21 and 22, respectively.
When the pinch roller arm 15 rotates and presses the pinch roller 13 onto the capstan shaft 2 of the capstan body 1, the pinch roller arm 15 rotates and presses the pinch roller 13 onto the capstan shaft 2 of the capstan body 1.

Since the conventional device is constructed as described above, the capstan body 1 is always located below the cassette 11 as shown in FIG. 7, so the height of the tape drive section cannot be made low. Ta.

[0006] In order to solve this problem, FIG.
A tape drive mechanism shown in FIG. 12 is employed. In this structure, as shown in FIG. 11, the pinch roller 13A is held in advance at a position away from the drawing range of the magnetic tape 12 (not shown), and the magnetic tape 12 is wound around the cylinder 18 as shown in FIG. When the magnetic tape 1
It descends to the height of 2 and is crimped with the capstan body 1A.

A capstan main body 1A used in the tape drive mechanism described above is shown. In the structure of this capstan body 1A, the bearing 4a of the holder 3A that supports the capstan shaft 2 is
, 4b are arranged on both sides of the tape abutting part, so that the necessary distance between the bearings to support the shaft can be secured.
Since the capstan body 1A can be made thin and does not overlap with the cassette 11, the height of the device body can be kept low.

[0008]

[Problems to be Solved by the Invention] Since the conventional magnetic recording/reproducing device is constructed as shown in FIGS. 11 to 14,
The capstan shaft 2, which should normally be against the back side of the magnetic tape 12, now comes into contact with the magnetic side of the magnetic tape 12, and as a result, magnetic powder accumulates and sticks to the capstan shaft 2.
There is a problem in that the drive performance of the magnetic tape 12 may be affected.

[0009] This invention was made to solve the above problems, and by adding a simple device,
The purpose is to obtain a magnetic recording/reproducing device capable of ensuring the performance of the device for a long time without any manual effort.

0010

[Means for Solving the Problems] A magnetic recording/reproducing device according to the present invention has a cleaning roller pressed onto a surface of the capstan shaft other than the contact surface of the pinch roller only during the magnetic tape pull-out operation. This is intended to prevent magnetic powder from adhering to the capstan shaft.

[0011]

[Operation] In this invention, the cleaning roller can only rotate in one direction, and when it comes into contact with the capstan shaft, its rotation is restricted, so it wipes the surface of the capstan shaft. In addition, since a slight rotation is performed during the operation leading to crimping, contact on only one surface can be avoided.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. Note that the same or equivalent parts as those of the conventional device are given the same reference numerals and the description thereof will be omitted. In FIG. 1, 1B is a capstan main body, and 3B is a holder, which has an opening 3b provided on the side opposite to the opening 3a on the surface that contacts the pinch roller 13A. A cleaning roller 25 is held so as to be able to be pressed against the capstan shaft 2 through the opening 3b, and arms 26a and 26b support the roller 25, and the roller 25 is rotatably held by a shaft 26c.

27 is the roller 2 of the arms 26a and 26b.
The shaft is a shaft whose end opposite to 5 is rotatable and supported at a constant height, and is installed on the base 9 of the main device. A drive arm 28 is rotatably fitted to the shaft 27 and rotates the arms 26a and 26b, and has a force in the direction of moving the cleaning roller 25 away from the capstan shaft 2, and a force in the direction of pushing it away from the capstan shaft 2. is spring 29a
, 29b, the roller 25 is pressed against the capstan shaft 2.

FIG. 2 is a sectional view taken along line II--II in FIG. 1, and 3c in the figure is a protrusion provided on the inner wall of the opening 3b of the holder 3B. The arm 26 is centered around the shaft 27.
When a and 26b rotate, the roller 25 comes into contact with them. A is the direction in which the capstan shaft 2 normally rotates, and B and C indicate the direction in which the roller 25 cannot rotate and the direction in which it can rotate, respectively. In other words, the roller 25 cannot rotate along with the capstan shaft 2.

In FIG. 4, reference numeral 28a denotes one end of the drive arm 28, which extends horizontally on the base 9 and is biased near the end by a spring 31 in a direction to move the roller 25 away from the capstan shaft 2. . Reference numeral 30 denotes a rotary lever whose part 30a extends over the moving guide groove 22 of the tape guide 20 and is rotatably fixed on the base 9 by a pin 32, and the other end is connected to one end 2 of the drive arm 28.
8a. The roller 25 has a shaft 26c at its center, surrounded by an intermediate section made of an elastic material such as an elastomer, and has an outer skin section made of a material such as felt on its outer periphery. A spring 33 having an inner diameter slightly smaller than the shaft diameter is fitted into the shaft 26c. This spring 3
3 has an arm extending in the radial direction, and this arm engages with a protrusion 26d of the arm 26a to form a so-called spring clutch. This allows the roller 25 to rotate only in one direction. Since the shaft 26c has some play at the joint of the arms 26a and 26b, when it is pressed onto the capstan shaft 2 by the springs 29a and 29b, it can almost follow the capstan shaft 2, and the portion per can be prevented.

Next, the operation will be explained. When the tape guide 20 moves along the guide groove 22 to mount the magnetic tape 12, it engages with the rotating lever 30 and pushes it away, so the rotating lever 30 extends the spring 31 and moves the drive arm 28. Rotate the cleaning roller 25
to the direction in which it is crimped onto the capstan shaft 2. During this movement of the roller 25, the roller 25 contacts the protrusion 3c on the inner wall of the holder 3B and rotates slightly in the C direction. The roller 25 contacts the capstan shaft 2, and the spring 29
When pressed by a and 29b, the roller 25 attempts to rotate together with the capstan shaft 2, but cannot rotate due to the spring clutch 33, and ends up wiping the surface of the capstan shaft 2.

Then, the tape guide 20 is connected to the rotating lever 3.
0, the rotation lever 30 and the drive arm 28 return to their original positions by the spring 31, and the arm 2
6a, 26b are also the engagement pieces 28b, 28 on the drive arm 28.
c to separate the roller 25 from the capstan shaft 2. At this time, the roller 25 comes into contact with the protrusion 3c, but in this case, the roller 25 rotates in the direction B, so it does not rotate. In this way, the surface of contact between the roller 25 and the capstan shaft 2 changes constantly, and it is possible to prevent uneven friction caused by contacting the same place each time.

In the above embodiment, the surface in contact with the capstan shaft 2 is the outer skin of the roller 25, but as shown in FIG. The same effect can be obtained even if the film is wound up by the feed rotation. Further, although the above embodiments have been explained using a spring clutch, it goes without saying that the same effect can be obtained by a combination of a latch and a gear.

[0019]

[Effects of the Invention] As described above, according to the present invention, the capstan shaft is cleaned every time the tape is loaded.
The effect is that the performance of the equipment can be maintained for a long time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the vicinity of a capstan main body of a magnetic recording/reproducing device showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a diagram showing changes in FIG. 2;

FIG. 4 is a plan view showing the magnetic recording/reproducing device of the present invention.

FIG. 5 is a perspective view of the main part of FIG. 1;

FIG. 6 is a perspective view of main parts showing another embodiment of the invention.

FIG. 7 is a vertical cross-sectional view showing the vicinity of a conventional capstan main body.

FIG. 8 is a diagram showing changes in FIG. 7;

FIG. 9 is a layout diagram showing a conventional magnetic recording/reproducing device.

FIG. 10 is a diagram showing changes in FIG. 9;

FIG. 11 is a layout diagram showing a different conventional device.

FIG. 12 is a diagram showing changes in FIG. 11;

13 is a longitudinal sectional view showing the vicinity of the capstan main body in FIG. 11. FIG.

FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. 13;

[Explanation of symbols]

1B Capstan body 2 Capstan shaft 3B Holder 3a, 3b Holder opening 3c Holder protrusion 8 Substrate 9 Base 11 Cassette 12 Magnetic tape 13A Pinch roller 14 Pinch roller shaft 15 Pinch roller arm 18 Rotating cylinder 19, 20 Tape guide 21, 22 Guide groove 25 Cleaning rollers 26a, 26b Roller support arm 26c Roller rotation support shaft 28 Drive arm 29a, 29b Spring 30 Rotating lever 31 Spring 33 Spring clutch

Claims (4)

[Claims] 1. A helical scan system comprising a cylinder device to which a rotary head is attached, a magnetic tape is pulled out from a cassette mounted on a base, wound around the cylinder device, and recorded and reproduced by the rotary head. In the magnetic recording/reproducing device, the magnetic tape is in a position retracted from the range of movement of the magnetic tape while the magnetic tape is being pulled out from the cassette and wound around the cylinder device, and the magnetic tape is in a substantially pulled out state. It is equipped with a pinch roller mechanism that moves into the loop formed by the magnetic tape and presses it against the opposing capstan shafts with the magnetic tape in between, sandwiching the magnetic tape and driving the magnetic tape by rotation of the capstan shaft. A magnetic recording/reproducing device comprising: a roller that contacts the capstan shaft on a surface of the capstan shaft other than the surface to which the pinch roller is pressed, in a range that is equal to or larger than the width of the tape and the pinch roller; A magnetic recording/reproducing device characterized by: 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the roller is pressed against or separated from the capstan shaft in response to an operation of pulling out the magnetic tape. 3. The magnetic recording and reproducing apparatus according to claim 1, wherein the roller is restrained from rotating when it comes into contact with the capstan shaft, and is rotatable in the opposite direction. 4. The magnetic recording and reproducing device according to claim 1, wherein the roller is surrounded by a band-shaped body made of a material such as felt, and has a space for storing a portion of the band-shaped body other than the periphery of the roller. Device.