JPS6329329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for a magnetic recording/reproducing device.

In general, in a magnetic tape recording system that uses a magnetic head (hereinafter referred to as a rotary head) disposed on a rotating drum, the rotary head normally rotates at high speed and contacts the magnetic tape while transmitting a predetermined signal onto the magnetic tape. Since the magnetic tape is recorded or reproduced on the magnetic tape, the rotating head is constantly susceptible to foreign matter such as dust, dirt, or oxide particles on the magnetic tape. If the rotary head continues to scan the magnetic tape with these foreign objects attached to the rotary head, the recorded and reproduced signals will deteriorate significantly. As the process progresses further, these foreign substances become firmly attached to the rotating head, causing a so-called clogging phenomenon, which makes it impossible to perform normal magnetic recording on the magnetic tape and also to prevent normal reproduction. In particular, such a clogging phenomenon is particularly likely to occur in a so-called still image recording/reproducing system in which a magnetic tape is intermittently scanned by a rotating head. Therefore, for example, still image recording and reproducing methods are mainly used to record and reproduce digital data.
Magnetic recording and reproducing devices such as DMS (data mass storage) mainly use a normal recording and reproducing method to record and reproduce predetermined signals. There is a need to further improve the reliability of playback and the longevity of magnetic tapes. For this reason, in a magnetic recording/reproducing device such as the above-mentioned DMS, it is necessary to prevent magnetic particles and other foreign matter from adhering to the rotating head etc. in advance to prevent the clogging phenomenon from occurring.

Conventionally, due to this need, the outer circumferential surface of the rotating drum and the rotating head have been periodically cleaned manually. However, when cleaning the outer circumferential surface of the rotating drum and the rotating head, the operator must stop the machine, remove the case cover from the top of the machine, and directly rotate the rotating drum. However, for example, the outer peripheral surface of the rotating drum and the rotating head were wiped with soft deerskin soaked with ethyl alcohol, etc., to clean foreign matter such as dust adhering to those surfaces. . This was an extremely troublesome task for the operator.

In view of these circumstances, the present invention has been proposed to automatically and quickly clean the outer circumferential surface of the rotating drum and the magnetic head of a magnetic recording/reproducing device having a rotating drum using an unused portion of a cleaning member without bothering the operator. This paper attempts to propose a cleaning device for a magnetic recording/reproducing device that can perform the following steps.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view showing a magnetic recording/reproducing device equipped with a cleaning device of the present invention, FIG. 2 is a perspective view showing the entire cleaning device and a part of the rotating drum, and FIG. 3 is a rotation of the cleaning device. FIG. 3 is a plan view of a main part showing a state before a cleaning operation is performed on the outer circumferential surface of the drum.

As shown in FIG. 1, the magnetic recording/reproducing device 1 includes:
A rotating drum 2 is provided, and the rotating drum 2 includes a rotating magnetic head (hereinafter simply referred to as a rotating head) 3 that rotates at high speed. An annular loading ring 4, which constitutes a driving part of a loading mechanism, is arranged on the outer periphery of the rotating drum 2 so as to surround the rotating drum 2, and is rotatable by three receiving rollers 5, 6, and 7. has been
Tape cassette 1 attached to cassette attachment section 8
0 is pulled out by a leading guide pin 12 installed on the loading ring 4, and guided and mounted over a predetermined winding range on the outer periphery of the rotating drum 2. There is.

Cassette attachment part 8 of the loading ring 4
The outer circumferential surface 2a of the rotating drum 2 is located on the opposite side.
A cleaning device 13 is also provided for wiping off foreign matter such as dust, dirt, or oxide particles adhering to the rotating head 3. The cleaning device 13 is comprised of a cleaning mechanism 14 and an intermittent supply mechanism 15, as shown in FIG. The former cleaning mechanism 14 includes a drive motor 16 that rotates at a low speed, a triangular cam 18 fixed to a rotating shaft 17 of this motor 16, and a driven roller 19 that is pressed by a cam protrusion 18a of this triangular cam 18. As the cam lever member 21 moves, it rotates in the direction of arrow A about the lever support shaft 20 as a fulcrum.
2 formed at one end of this cam lever member 21
Connecting pin 22 inserted between crotch parts 21a and 21b
and the lower rotating plate 2 on which this connecting pin 22 is implanted.
3a, this rotating plate 23a, an L-shaped upper rotating plate 23b spaced apart from each other by a predetermined distance, and a connecting plate 23c connecting these at one end. A swing arm 25 that moves and this swing arm 25
A rotatable pressure roller 26 provided at the tip of the upper rotating plate 23b, and a feed-out roller rotatably provided on a ratchet pulley shaft 27 planted on the pressure roller 26 and the lower rotating plate 23a. It is comprised of a tape-shaped cleaning member 29 made of, for example, non-woven paper or deerskin, which is stretched over both the roller 28 and the roller 28. Note that the lower rotating plate 23a is provided with a contact portion 25a that contacts the rotation stop switch Sa of the motor 16.

The latter intermittent supply mechanism 15 includes a stopper member 3
A tape feed lever member 31 is blocked by a tip end 30a of the tape feed lever member 31 and rotates in the direction of arrow C in FIG. 2 about the ratchet pulley shaft 27. A coil-shaped transmission member 32 disposed around the transmission member 27, a ratchet pulley 33 connected to the other end of the transmission member 32 and rotated by the transmission member 32, and a toothed portion of the ratchet pulley 33 that engages with the toothed portion of the ratchet pulley 33. , a ratchet pawl 34 that allows the ratchet pulley 33 to rotate in only one direction, and a feed roller 28 that moves the cleaning member 29 by a predetermined amount in conjunction with the ratchet pulley 33.

Next, the operation of the present invention having the above structure will be explained with reference to FIGS. 3 to 5.

The cleaning of the rotating drum and the like by the cleaning device of the present invention is performed before the magnetic tape is wound around the rotating drum by the loading mechanism, or after the magnetic tape wound around the rotating drum is removed from the rotating drum.

First, upon receiving the start command signal, the drive motor 16
When the motor 16 is rotated at a predetermined speed,
A triangular cam 18 fixed to a rotating shaft 17 rotates in the direction of arrow D in FIG. When this triangular cam 18 rotates, the driven roller 19 that was located in the cam recess 18b of this cam 18 is rotated.
gradually pushed out. Therefore, the cam lever member 21 on which this roller 19 was pivotally supported is
Against the elastic force of the elastic member 9, the lever begins to rotate about the lever support shaft 20 in the direction of arrow A in FIG. When the cam lever member 21 starts rotating, the swing arm connecting pin 22 inserted between the two crotches 21a and 21b formed at one end of the cam lever member 21 is pressed by the two crotches 21a and 21b. This connecting pin 22 moves in the direction of arrow E in FIG. 3 with the swing arm shaft 24 as a fulcrum. Therefore, the swing arm 25 in which this connecting pin 22 is implanted
The lower rotating plate 23a rotates in the direction of arrow F in FIG. 3 about the swing arm shaft 24 as a fulcrum. Since this lower rotating plate 23a is integrally formed with the upper rotating plate 23b via a connecting plate 23c (see FIG. 2), this upper rotating plate 23b also has an arrow mark in the same figure as shown in FIG. Rotate in direction F. Therefore, the pressure roller 26 provided on the pressure roller shaft 35 at the tip of the upper rotating plate 23b begins to move toward the rotating drum 2 (see FIG. 5).

Next, the triangular cam 18 begins to rotate and the cam convex portion 1
When the roller 19 reaches a predetermined position on the outer circumference of 8a,
A part of the outer circumferential surface of the cleaning member 29 along the outer circumference of the pressure roller 26 is attached to the outer circumferential surface 2 of the rotating drum 2.
a (see FIG. 5), and as the cam 18 further rotates and the roller 19 is pushed out to a high position on the outer periphery of the cam protrusion 18a of the cam 18, away from the rotating shaft 17, The pressing force of the cleaning member 29 against the outer peripheral surface 2a of the rotating drum 2 by the pressing roller 26 is increased, and the required pressing force can be obtained at the highest position on the outer periphery of the cam convex portion 18a, as shown in FIG. Pressure roller 26
When the cleaning member 29 is pressed onto the outer peripheral surface 2a of the rotating drum 2, the roller 19 is pressed against the cam convex portion 18a.
It continues for a predetermined time from the highest position to a predetermined position where it passes through this position and gradually becomes lower. Then, when the contact portion 25a provided on the lower rotating plate 23a contacts the rotation stop switch Sa, the rotation of the motor 16 is stopped and the cleaning operation is completed. Therefore, during this crimping time, the rotary head 3 rotating at high speed and the outer circumferential surface 2 of the rotary drum 2 on which this rotary head 3 is installed
As shown in FIG. 6, since the cleaning member 29 continues to be in contact with a part of the cleaning member 29, the cleaning action of the cleaning member 29 sufficiently cleans the outer peripheral surface 2a of the rotary head 3 and the rotary drum 2. It is possible to remove attached dust, dirt, or foreign matter such as oxide particles peeled off from the surface of the magnetic tape 11 shown in FIG. Note that, for example, the outer peripheral surface 2 of the rotating drum 2 of the cleaning member 29
Even if the pressing time to a is about 2 seconds, the rotating drum 2 rotates at an extremely high speed (for example,
1800rpm), the rotating drum 2 has a rotation speed of approximately 60 rpm.
While rotating, the rotating head 3 installed on the rotating drum 2 comes into contact with the same spot on the cleaning member 29 about 60 times. Therefore, foreign matter can be sufficiently removed from the rotating head 3 and the like.

In this way, the cleaning mechanism 14 operates, but in the present invention, in addition to the cleaning mechanism 14, an intermittent supply mechanism 15 is provided, and the pressure roller 26 of the cleaning mechanism 14 is pressed against the outer circumferential surface 2a of the rotating drum 2. At the stage before pressing the drum, the cleaning member 29 is moved by a predetermined amount in conjunction with the pressing operation of the pressing roller 26 of the cleaning mechanism 14, so that the unused portion of the cleaning member 29 always touches the outer circumferential surface 2a of the rotating drum 2. It is adapted to be crimped.

The operation of this intermittent supply mechanism 15 will be explained below in relation to the cleaning mechanism 14.

First, the swing arm 25 constituting the cleaning mechanism 14 begins to rotate in the direction of arrow B in FIG.
Lower rotating plate 2 that constitutes this swing arm 25
Part 3 of the tape feed lever member 31 rotatably attached to the ratchet pulley shaft 27 on 3a
A stopper member 30 fixed to a mounting board 38 comes into contact with 1a. However, this stopper member 30 is a part 31 of the tape feed lever member 31.
Since the lower rotating plate 23a of the swing arm 25 continues to rotate even after contacting the tape a, the tape feed lever member 31 resists the elastic force of the elastic member 38 while being pressed by the stopper member 30. 5th
It rotates in the direction of arrow C in the figure. Therefore, the transmission member 32 whose one end is connected to the tape feed lever member 31 causes a twisting action, and the ratchet pulley 33 which is rotatably attached to the ratchet pulley shaft 27 which is connected to the other end of the transmission member 32 is rotated. 5 by a predetermined amount (for example, one tooth of the ratchet pulley 33) in the direction of arrow D in FIG. For this reason, the feed roller 28 which is in an interlocking relationship with the ratchet pulley 33 rotates in the same direction, so that a tape-shaped cleaning member is spread between the pressure roller 26 and the feed roller 28. 29 is moved by a predetermined amount in the direction of arrow K in the figure. Here, the predetermined amount is necessary to avoid the part to which foreign matter has adhered so that the cleaning member 29 to which foreign matter has adhered due to a cleaning operation that has already been completed is not used for a new cleaning operation. It is a sufficient distance.

Then, when the cleaning member 29 is moved by a predetermined amount and the rotation operation of the ratchet pulley 33 is completed, the elastic force of the elastic member 39 causes the ratchet claw 34 to move.
enters the predetermined teeth of the ratchet pulley 33,
This prevents the cleaning member 29 from rotating in reverse during cleaning.

In this way, the intermittent supply mechanism is configured such that the cleaning member 29 of the cleaning mechanism 14 can be moved a predetermined amount by a predetermined amount before the cleaning member 29 of the cleaning mechanism 14 is pressed against the outer circumferential surface 2a of the rotary drum 2 by utilizing the rotational movement of the cleaning mechanism 14. 15, the unused portion of the cleaning member 29 can always be pressed against the outer circumferential surface 2a of the rotating drum 2, etc.
Therefore, good cleaning can always be performed. Dust and other foreign substances taken out from the outer circumferential surface 2a of the rotating drum 2 by the cleaning action of the cleaning member 29 are deposited on the cleaning member 29 at regular intervals, as shown by the imaginary lines in FIG. cleaning member 2
9, the cleaning operation can be performed an extremely large number of times. Therefore, the cleaning member 29 can be replaced at the same time as regular inspection of the magnetic recording/reproducing device.

The time and pressure for pressing the cleaning member 29 onto the outer circumferential surface 2a of the rotating drum 2 and the like are determined so that the cleaning action can be achieved without causing unnecessary damage to the outer circumferential surface 2a of the rotating drum 2 and the rotating head 3. selected.

The cleaning member 29 is attached to and detached from the pressure roller 26 and the feed roller 28 by a tension pin 37 of a tension arm 36 for applying a predetermined tension force to the cleaning member 29.
This is done with the cleaning member 29 removed.

Furthermore, when one cycle of cleaning operation is completed, the changeover switch S is operated to stop the rotation of the motor 16 by the contact portion 25a of the lower rotary plate 23a that is in contact with the changeover portion Sa.

The cleaning device in the magnetic recording/reproducing device of the present invention can be operated fully automatically by motor drive, but if necessary, the cleaning mechanism or intermittent supply mechanism can be operated manually to perform intensive cleaning. Of course it is also possible.

As described above, the present invention provides a method for cleaning the outer circumferential surface of the rotating drum and the magnetic head once so that the unused and clean portion of the cleaning member is pressed against the outer circumferential surface of the rotating drum and the magnetic head. Since the cleaning member is moved by a predetermined amount beforehand, good cleaning can be achieved.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing a magnetic recording and reproducing apparatus equipped with a cleaning device of the present invention, FIG. 2 is a perspective view showing the entire cleaning device and a part of the rotating drum, and FIG. 3 is an outer peripheral surface of the rotating drum. FIG. 4 is a cross-sectional view of a main part taken along the line A--A in FIG. , FIG. 5 is a plan view of essential parts showing the state of the cleaning device during cleaning operation, and FIG. 6 is a perspective view showing the state of a part of the cleaning device and the rotating drum while the cleaning device is in operation. 2...Rotating drum, 3...Rotating magnetic head, 4...Loading ring, 13...Cleaning device, 1
4...Cleaning mechanism, 15...Intermittent supply mechanism, 1
6...Motor, 18...Triangular cam, 25...Swing arm, 26...Pressure roller, 28...Feeding roller, 29...Cleaning member, 33...Ratchet pulley, 34...Ratchet pawl.

Claims (1)

[Scope of Claims] 1. In a magnetic recording/reproducing device having a rotatable rotating drum having a magnetic head protruding from the outer circumferential surface thereof, a cleaning member is pressed onto the outer circumferential surface of the rotating drum for a predetermined period of time to prevent the rotation of the drum. a cleaning mechanism that performs a cleaning operation to wipe off foreign matter adhering to the outer circumferential surface of the drum and the magnetic head; and when the cleaning mechanism performs the cleaning operation, an unused portion of the cleaning member constituting the cleaning mechanism is pressed against the outer circumferential surface of the rotating drum. and an intermittent feeding mechanism for moving the cleaning member by a predetermined amount in conjunction with movement of the cleaning mechanism between a position where the cleaning mechanism is pressed onto the rotating drum and a position away from the rotating drum. A cleaning device for a magnetic recording/reproducing device.