JPH08279121A - Rotary magnetic head cleaning device - Google Patents

Abstract

PURPOSE: To enhance a cleaning efficiecy for a magnetic head by cleaning the magnetic head slightly while rotating cleaning roller at the time of tape loading and regulating the rotation of the cleaning roller while applying load to the roller at the time of tape unloading. CONSTITUTION: When a loading operation is performed, a leading guide 18 makes a guide goove 11a move upward. A cleaning roller(CR) 15 is abutted on a rotary cylinder 12a to perform the cleaning of a magnetic head 13 while rotating only during the side face of the leading guide 18 comes into contact with the intermediate part 14b' of a sliding piece 14b. Moreover, the leading guide 18 slides upward and the engaging piece 18a of the leading guide 18 is engaged with an actuating piece and then a torsion lever 17 makes the CR move to a descending position to finish the loading operation. When an unloading operation is started, however the CR 15 is abutted on a rotary drum 12 on the mid-course, the part in contact with a fixed cylinder 12b is large and the CR 15 performs the cleaning in almost standstill state. Succeedingly, the CR is moved again to an ascending position by the unloading operation to finish the cleaning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for a magnetic head mounted on a rotary drum in a magnetic recording / reproducing device such as a video tape recorder (hereinafter referred to as VTR).

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. 6-290427 (G11B 5/41) is known as this type of conventional technology. The main part of the publication is shown in FIG. In the drawing, reference numeral 1 is a rotary cylinder on which a rotary magnetic head 2 is mounted, and 3 is a cleaning roller rotatably supported by an arm 4. A cam portion 3a is formed on the cleaning roller 3 and is in contact with the pin 4a on the arm 4. 5 is an arm 4 and a coaxial 6
A drive lever pivotally supported by the drive lever 5 and the arm 4
A spring 7 is hung between the drive lever 5 and the chassis 8
A spring 9 is also hung between them. Reference numeral 10 is a pull-out lever.

Rotation of the pull-out lever 10 (10 '→ 1
0 or 10 ″ → 10) causes the drive lever 5 to rotate in the counterclockwise direction (CCW) about the shaft 6, so that the urging force of the spring 7 causes the arm 4 to rotate in the clockwise direction (CW). The cleaning roller 3 contacts the rotary cylinder 1. Therefore, the cleaning roller 3 cleans the magnetic head 2.
The rotation of the rotating cylinder 1 to CCW causes the cleaning roller 3 to rotate to CW. As a result, the cleaning roller 3 moves up and down the support shaft 4b along the cam portion 3a while rotating to CW.

[0004]

With the above configuration, there are the following concerns. That is, when the cleaning roller comes into pressure contact with the rotary magnetic head, the cleaning roller comes into pressure contact with the rotary cylinder and the fixed cylinder, but a frictional force acts on the fixed cylinder side to keep the rotation of the cleaning roller stationary. Therefore, when the contact area between the cleaning roller and the fixed cylinder becomes large, the static friction force by the fixed cylinder becomes larger than the rotational driving force applied to the cleaning roller by the rotary cylinder and the rotary magnetic head, and the cleaning roller does not rotate. As a result, the cleaning roller does not rotate and does not move up and down, and the same part comes into contact with the rotary magnetic head, and the dirt on the cleaning roller accumulates, which reduces the cleaning effect or, conversely, the rotary magnetic head. There is a concern that it will get dirty.

[0005]

Therefore, in the present invention, a cleaning roller for contacting a rotating magnetic head to clean the magnetic head, a cleaning roller rotatably provided on one side, and a sliding contact piece on the other side are formed. A rotating arm that is urged in one direction and moves to two upper and lower positions; one end is urged by a torsion spring in a moderation manner, and the other end is provided with a contact tongue piece. And a leading guide having an engaging piece that forms a tape loading and tape unloading and engages with the abutting tongue, and the leading guide serves as a sliding contact piece during tape loading by the leading guide. The cleaning roller cleans the magnetic head by contacting and rotating the rotating arm against the biasing force, and the engaging piece comes into contact with the tongue piece by the subsequent movement of the leading guide. It engaged by swinging the swing arm,
The cleaning roller is moved to the lowered position.

During the tape unloading of the leading guide, the leading guide comes into contact with the sliding contact piece, and the rotating arm rotates against the bias, whereby the cleaning roller cleans the magnetic head and continues. By the movement of the leading guide, the engaging piece engages with the other side of the swing arm to swing the swing arm, and the cleaning roller is moved to the raised position.

[0007]

With the above-described structure, during the tape loading by the leading guide, the cleaning roller in the raised position abuts the rotating cylinder to rotate and clean the magnetic head, and the subsequent leading tape loading operation cleans the magnetic head. The tape loading operation is completed with the roller moved to the lowered position.
While the cleaning roller is in the lowered position during the tape unloading of the leading guide, the cleaning roller comes into contact with the rotating cylinder to clean the magnetic head. Clean the magnetic head while stationary. By the subsequent tape unloading operation, the cleaning roller moves to the raised position again, and the tape unloading operation is completed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view of the magnetic head during cleaning, FIG. 2 is a plan view of the tape unloading state, and FIG. 3 is a plan view of the tape loading completion state.
4 is a side view of the tape unloading state, FIG. 5 is a side view of the tape loading / unloading process, and FIG. 6 is a side view of the rotating cylinder and the cleaning roller in different states.

In FIGS. 1 and 4, 11 is a guide groove 1a.
The reference numeral 12 denotes a chassis in which is cut, 12 is a rotary drum device including a rotary cylinder 12a on which a rotary magnetic head 13 is mounted and a fixed cylinder 12b, and 14 is a rotary arm pivotally supported by a support shaft 11b. A cleaning roller 15 is rotatably provided on one end (one side) of the rotating arm 14 and a stopper piece 14e is provided on the other side, and an elastic biasing piece 1 is provided on the other side.
4a and the sliding contact piece 14b and the cylindrical portion 14 which are exposed to the guide groove 1a.
c is integrally formed, and the cylindrical portion 14c is provided so as to be rotatable with respect to the shaft 11b and movable up and down. A pin 14d is provided on the tubular portion 14c.

Reference numeral 16 denotes a swing arm which swings with a support shaft 11c formed by outsert molding or the like on the chassis 11 as a rotation support point 16a. A torsion spring 17 is hung between one end 16b of the swing arm 16 and the hook 11d of the chassis 11 to moderately hold the swing arm 16 in two positions, a raised position and a lowered position. The swing lever 16 is engaged with the pin 14d at the hook portion 16c and moves the rotating arm 14 up and down along the shaft 11b. Reference numeral 16d is a tongue piece as an operating means, 16e is a stopper piece, and 16f is the other end of the swing arm 16, and is formed in a shape in which the tip is lifted so as to engage with an engaging piece of a leading guide described later. There is. Reference numeral 18 is a leading guide having an engaging piece 18a formed therein, which slides in the guide groove 11a. In addition, 11e, 11
Reference symbol f denotes a stopper projection on the chassis 11, which is a stopper piece 14e of the rotating arm 14 and an elastic biasing piece 14 respectively.
The rotary arm 14 is held in the position shown in FIG. 2 while the cleaning roller 15 is separated from the rotary drum device 12.

Next, the operation of the present invention will be described. 2 and 4 show the tape unloading state. As shown in FIG. 4, the torsion spring 17 is moving rightward beyond the click point, and the cylindrical portion 14c of the rotating arm 14 is moved.
Is held in the raised position. At this time, the rotary drum device 1
2 shows the positional relationship between the cleaning roller 15 and the cleaning roller 15.
As shown in (a), the cleaning roller 15 is in the raised position.

When the play operation is performed in this state, the leading guide 18 pulls out the tape (not shown) and guide groove 1
1a is moved upward in the drawing in FIG. During the tape loading, the side surface 18b of the leading guide 18 is
When slidingly contacting the sliding contact piece 14b, the rotating arm 14 rotates to CCW against the biasing force of the elastic biasing piece 14a. FIG.
In the state shown in, that is, the side surface 18b of the leading guide 18,
The cleaning roller 15 contacts the rotary drum device 12 to clean the rotary magnetic head 13 only during the period in which the sliding contact piece 14b is in sliding contact with the middle 14b '. At this time, as shown in FIG. 6B, the cleaning roller 15
Is more in contact with the rotating cylinder 12a than the frictional force that tries to prevent the cleaning roller 15 from rotating due to the contact with the fixed cylinder 12b. Is sufficiently large, the cleaning roller 15 cleans the magnetic head 13 while rotating appropriately.

Subsequently, the leading guide 18 is guided by the guide groove 11a.
1 is slid further upward than in FIG. 1, the engaging piece 18a of the leading guide 18 is moved to the tongue piece (operating piece) as shown in FIG. 5 (a).
Since it engages with 16d, the swing arm 16 has a rotation fulcrum 16
The stopper 16e comes into contact with the chassis 11 by rotating to a CW in the drawing against the biasing force of the torsion spring 17 around a. That is, the torsion spring 17 tilts to the left beyond the click point, moves the cylindrical portion 14c to the lowered position, and holds the cleaning roller 15 in the lowered first position (see FIG. 5B). Tape loading is completed in this state (see FIG. 3). The positional relationship between the rotary drum device 12 and the cleaning roller 15 at this time is as shown in FIG.

Next, when a stop or eject operation is performed, the leading guide 18 moves in the guide groove 11a downward from the state of FIG. Since the side surface 18b of the leading guide 18 again comes into sliding contact with the sliding contact piece 14b, the rotating arm 14 rotates to CCW in the same manner as described above, and the cleaning roller 15 is in contact with the intermediate portion 14b 'of the sliding piece 14 during the sliding contact period. Contacts the rotary drum device 12 to clean the magnetic head 13.
At this time, as shown in FIG. 6D, the cleaning roller 1
Since 5 is in contact with the fixed cylinder 12b more than with the rotary cylinder 12a, the cleaning roller 15 does not rotate and cleans the magnetic head 13 in a substantially stationary state. Due to the subsequent downward movement of the leading guide 18, the engaging piece 18a of the leading guide 18 moves before the tape unloading.
Since it abuts against the other end 16f of the rocking arm 16, the swing arm 16 pivots about the pivot fulcrum 16a toward the CCW. Therefore, the torsion spring 17 tilts to the right beyond the click point, and the shaft 11
The rotating arm 14 is moved to the raised position along b, and the cleaning roller 15 is held at the raised second position,
After the state shown in FIG. 4, the state returns to the unloading state shown in FIG.

As described above, according to the configuration of the present invention, the cleaning roller 15 switches the height of the cleaning roller 15 in two steps up and down during the period in which the cleaning roller 15 is not in pressure contact with the rotary magnetic head 13, thereby leading the guide roller for the first time. During the forward path period, that is, during tape loading, the cleaning roller 15 is stably rotated by reducing the contact area with the fixed cylinder 12b, and the magnetic head is cleaned without applying too much load to the magnetic head. The cleaning roller 15 is lowered, and the lowered cleaning roller 15 is brought into contact with the rotary drum 12 again during the return path of the leading guide 18 during the tape unloading after the recording / reproduction is completed. At this time, the area of the cleaning roller 15 that contacts the fixed head 12b is set larger than that of the rotary cylinder 12a, so that the frictional force on the cleaning roller 15 increases and the rotation of the cleaning roller 15 is restricted. Leading guide 18
The cleaning effect on the magnetic head from the outward path of
To be enhanced. Since the height of the cleaning roller 15 is alternately switched between the forward path and the return path, the cleaning roller 15 evenly disperses the dirt in the circumferential direction even on the return path.

[0016]

According to the present invention, the magnetic head is relatively lightly cleaned while rotating the cleaning roller at the time of loading the tape, and a load is applied to the cleaning roller at the time of unloading the tape after recording / reproducing to rotate the cleaning roller. By regulating the above, the cleaning efficiency with respect to the magnetic head is improved, and the dirt attached at the time of recording / reproducing is completely removed. That is, before recording / reproducing, lightly remove dirt such as dust that has adhered to the magnetic head when not in use, and after recording / reproducing, apply a load to the magnetic head that may have magnetic particles to clean it. As a result, a sufficient cleaning effect can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a magnetic head during cleaning.

FIG. 2 is a plan view of a tape unloading state.

FIG. 3 is a plan view of a tape loading completed state.

FIG. 4 is a side view of the tape unloading state.

FIG. 5 is a side view during tape loading / unloading.

FIG. 6 is a side view of a rotating cylinder and a cleaning roller in different states.

FIG. 7 is a plan view of a main part of a conventional example and a side view of a cleaning roller.

[Explanation of symbols]

 13 Rotary Magnetic Head 14 Rotating Arm 14a Sliding Contact Piece 15 Cleaning Roller 16 Swing Arm 16d Tongue Piece (Actuating Means) 17 Torsion Spring (Biasing Means) 18 Leading Guide

Claims (4)

[Claims] 1. A cleaning roller for contacting a rotating magnetic head to clean the magnetic head, a cleaning roller rotatably provided on one side, and a sliding contact piece formed on the other side for urging in one direction. And a swinging arm that moves to two upper and lower positions, a swinging arm that is connected to the swinging arm, one end of which is biased by a biasing means, and the other end of which is provided with an actuating means, and a cassette. It has an engaging piece that engages with the actuating means, which forms a tape loading for pulling out the magnetic tape and winding the magnetic tape around the rotary cylinder on which the rotary magnetic head is mounted for a predetermined angle, and a tape unloading for storing the magnetic tape in a cassette. A leading guide, the leading guide contacts the sliding contact piece during tape loading by the leading guide, and the rotating arm rotates against the bias. As a result, the cleaning roller cleans the magnetic head, and the subsequent movement of the leading guide causes the engagement piece to engage with the actuating means to swing the swinging arm, thereby moving the cleaning roller to the first position. Rotating magnetic head cleaning device characterized by being moved to the position. 2. The cleaning roller causes the magnetic head to move when the leading guide comes into contact with the sliding contact piece during the tape unloading of the leading guide and the rotating arm rotates against the bias. While cleaning, the engagement piece is engaged with the other side of the swing arm by the subsequent movement of the leading guide to swing the swing arm and move the cleaning roller to the second position. The rotary magnetic head cleaning device according to claim 1, which is characterized in that. 3. The rotary magnetic head cleaning device according to claim 1, wherein the actuating means is a tongue piece formed on the swing arm, and the biasing means is a torsion spring. 4. The rotary magnetic head cleaning device according to claim 1, wherein the first position is a lowered position and the second position is a raised position.