JPH0586105U - Cleaning mechanism for rotary head device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a cleaning mechanism of a rotary head device, the rotational force of a cleaning member is improved to prevent uneven wear due to unstable rotation. [Composition] The shape of the cleaning member from the lower end to the upper end,
I made it bigger. Further, the rotary shaft of the rotary drum and the rotary shaft of the cleaning member were tilted. .. This increases the frictional force between the rotary drum and the cleaning member, improves the rotational force, and prevents the occurrence of unstable rotation.
Prevents uneven wear of the cleaning member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cleaning mechanism for rotary head devices such as VTRs and R-DATs, and more particularly to improving the cleaning power and extending the life of cleaning members.

[0002]

[Prior Art]

 As shown in FIG. 6, a cleaning mechanism of a conventional rotary head device has a magnetic head 3 arranged on the outer periphery of a rotary drum 2 rotatably attached to a fixed drum 1 attached to a chassis base (not shown). A rotary head device, a rotating cleaning member 4 that intermittently contacts the outer periphery of the rotary head device, a shaft 5 that supports the rotation of the cleaning member 4, and an arm 6 that moves the cleaning member 4. There is.

Further, the central axis of rotation of the rotary head device and the shaft 5 are arranged in parallel. The arm 6 moves so that the cleaning member 4 contacts both the fixed drum 1 and the rotating drum 2. Next, the operation will be described. When the cleaning member 4 comes into contact with the outer periphery of the rotating drum 2 which is rotating, the cleaning member 4 rotates due to the frictional force of each other. The cleaning member 4 contacts the magnetic head 3 arranged on the outer periphery of the rotary drum 2 while rotating. By this operation, the dirt on the surfaces of the rotary drum 2 and the magnetic head 3 is removed by the cleaning member 4. The movement of the cleaning member 4 is carried out by the movement of the arm 6, but the movement of the arm 6 is carried out by a cam mechanism or a link mechanism (not shown) for mode setting.

Further, the cleaning member 4 itself has a substantially cylindrical shape as shown in FIGS. 7A, 7B, 7C and 7D, and is for passing the shaft 5 from the top surface to the bottom surface. A hole is formed. As shown in FIG. 7 (b), which is an AA sectional view (C) and a BB sectional view (d), the sections have the same circular shape. Can be contacted with each.

[0005]

[Problems to be solved by the device]

 The frictional force between the cleaning member 4 and the rotary drum 2 becomes the rotational force of the cleaning member 4, and the frictional force between the cleaning member 4 and the fixed drum 1 becomes the braking force. Therefore, in order to obtain stable rotation, always apply the rotational force. It should be larger than the frictional force. However, in the conventional cleaning mechanism, since the outer circumference of the rotary head device and the outer circumference of the cleaning member 4 are in parallel contact with each other, the frictional force with the rotary drum is insufficient. Also, after many years of use, the surface of the cleaning member 4 becomes dirty, the frictional force with the rotating drum 2 is significantly reduced, the rotation of the cleaning member 4 is stopped, or the rotation becomes unstable. 4 wears unevenly, and the cleaning ability decreases. Further, if the cleaning member 4 does not rotate, the contact force with the magnetic head increases and the life of the head is shortened.

[0006]

[Means for Solving the Problems]

 Therefore, the present invention uses a cleaning member whose cross-sectional shape perpendicular to the rotation axis of the cleaning member is gradually increased from the lower end to the upper end of the cleaning member at an arbitrary ratio to improve the frictional force with the rotating drum. It is a thing. In addition, the rotation center axis of the rotating drum and the rotation axis of the cleaning member are arranged so as not to be parallel to each other to improve the frictional force with the rotating drum.

[0007]

【Example】

 Next, an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, 1 is a fixed drum, 2 is a rotary drum rotatably attached to the fixed drum, and 3 is a magnetic head arranged on the outer periphery of the rotary drum. A cleaning member 4 is made of, for example, urethane foam sponge or felt. Reference numeral 5 is a rotary shaft of the cleaning member 4, and 6 is a movable arm. The arm 6 is connected to a cam mechanism or a link mechanism as in the conventional case.

As shown in FIG. 1, the cleaning member 4 is rotatably supported by the shaft 5 and comes into contact with the rotary drum 2 and the fixed drum 1 by the movement of the arm 6. At this time, as shown in FIGS. 2 (a), (b), (c), and (d), the cleaning member 4 has a substantially conical shape with a circular cross section whose diameter increases toward the upper surface. The -A cross section contacts the rotating drum 2, and at the same time, the BB cross section shown in FIG. Then, the friction of the portion in contact with the fixed drum 1 is much larger than the friction of the portion in contact with the fixed drum 1, so that good cleaning is performed. If necessary, as shown in FIGS. 3 (a) and 3 (b), the surface inclined portion of the cleaning member 4 can be made to have a curved surface.

In the embodiment shown in FIG. 4, the rotation center axis 7 of the rotary drum and the rotation axis 8 of the cleaning member are inclined by θ ° (for example, 5 °) to increase the frictional force with the rotary drum and to clean the cleaning member. The torque of No. 4 is improved.

In FIG. 5, the sectional shape of the cleaning member 4 perpendicular to the rotation axis is enlarged from the lower end to the upper end of the cleaning member 4, and the rotation center axis line 7 of the rotating drum and the rotation axis line 8 of the cleaning member are θ °. By inclining, the frictional force with the rotating drum is increased and the rotational force of the cleaning member 4 is improved.

[0012]

[Effect of the device]

 As described above, the present invention can improve the frictional force between the cleaning member and the rotary drum in the cleaning mechanism of the rotary head device, so that the cleaning member can rotate stably, so that the life of the cleaning member is improved. As a result, the life of the magnetic head is extended.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is the cleaning member shown in FIG. 1, in which (a) is a three-dimensional view, (b) is a front view, and (c) is a sectional view taken along line AA of (b).
(D) is a BB cross section of (b).

FIG. 3 is a perspective view showing another embodiment of the cleaning member according to the present invention.

FIG. 4 is a side view showing another embodiment of the present invention.

FIG. 5 is a side view showing still another embodiment of the present invention.

FIG. 6 is a side view showing a conventional example.

7A and 7B are views showing a cleaning member of a conventional example, in which FIG. 7A is a three-dimensional view, FIG. 7B is a front view, and FIG.
(D) is a BB sectional view.

[Explanation of symbols]

 1 Fixed Drum 2 Rotating Drum 3 Magnetic Head 4 Cleaning Member 5 Rotating Shaft 6 Arm 7 Rotating Drum Rotating Center Axis 8 Cleaning Member Rotating Axis

Claims (2)

[Scope of utility model registration request] 1. A rotary head device in which a magnetic head is arranged on the outer circumference of a rotary drum that is rotatably attached to a fixed drum, and a cleaning member that rotates intermittently in contact with the outer circumference of the rotary head device. In the cleaning mechanism of the rotary head device, the rotary head device is characterized in that the sectional shape of the cleaning member perpendicular to the rotation axis is gradually increased from the lower end to the upper end of the cleaning member at an arbitrary ratio. Cleaning mechanism. 2. A cleaning mechanism for a rotary head device according to claim 1, wherein the rotation center of the rotary drum and the rotation axis of the cleaning member are arranged so as not to be in parallel with each other.