JPS6396764A - Rotary head type recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain positive head touch, by providing a rotatable head, an upper and a lower tape guide drums, along the outer peripheral plane of which the head is rotated, and a pad of circular arc shape abutting along the circular arc of the tape guide drum. CONSTITUTION:When the loading of a tape is performed, and a state possible to be recorded and reproduced is available, the pad 5 is abutted with the tape guide drums 2 and 3. And since the radius RP of the pad 5 of circular arc shape abutting along the circular arc of the tape guide drum is formed smaller than the radius Rd of the guide drum, the positive touch of the tape at the input side and the output side of the tape can be obtained. Also, since a device is constituted so that a part of a lead part (l) can be visualized in the lower side of the pad, a state along the leading of the tape 4 at time of feeding can be visualized and confirmed, and the adjustment of the feeding can be facilitated, and it is possible to control the operation of the pad by interlocking the loading of the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary head type recording/reproducing apparatus such as a video recorder or a digital audio recorder using a rotary head.

2. Description of the Related Art In recent years, rotary head type recording and reproducing devices are being used not only in video recorders but also in audio recorders.

An example of the above-mentioned conventional rotary head type recording/reproducing device will be described below with reference to the drawings.

FIG. 7 is a top view showing an outline of a general rotary head type recording/reproducing device, and FIG. 8 is a front view thereof.

In the figure, 1 is a head, and 2 is an upper guide drum. The head 1 is fixed to the lower surface of the upper guide drum 2 and rotates in the direction of the arrow with its tip slightly protruding from the outer peripheral surface. 3 is fixed by a lower guide drum, and a stepped portion or lead 1 is formed to regulate the lower end position of the tape 4. 4 is a tape that runs in the direction of the arrow. A is the entry side where the tape 4 and the head begin contact, B is the center, and C is the exit side where the tape and the head 1 end contact.

The operation of the rotary head type recording/reproducing apparatus configured as described above will be explained below.

First, the tape 4 entering the section A starts to come into contact with the head 1 attached to the lower surface of the upper guide drum 2 at the lower end of the tape 4, so that the lower end of the tape 4 protrudes as shown in FIG. 9A. The head 1 pushes up and floats, and there is a tendency that reliable contact cannot be obtained. When the head 1 comes to the center of the tape 4 as the upper guide drum 2 rotates, the top and bottom of the tape 1 are balanced as shown in FIG. 9B, and the head of the tape 4 can be surely touched. As the rotation of the rotating drum 2 further advances and approaches the exit side,
As shown in FIG. 9C, the head 1 comes into contact with the upper end of the tape 4, causing the upper end of the tape 4 to float, and the head 1's contact with the tape 4 tends to be uncertain as well as on the entry side. .

Problems to be Solved by the Invention However, with the above configuration, the contact between the tape and the head on the input side and the output side becomes uncertain, and furthermore, the contact relationship is in opposite directions. Even if the tip of the head 1 is mounted slightly upward in an attempt to improve the contact on the side, the contact worsens on the exit side, resulting in stable recording and playback over the entire contact range from the entry side to the exit side. The problem was that it was not possible.

In view of the above-mentioned problems, the present invention provides a rotating head device that can provide reliable head touch.

Means for Solving the Problems In order to solve the above problems, the rotating head device of the present invention has a rotating head that rotates along the outer peripheral surface of the upper and lower tape guide drums, and that rotates along the arc of the tape guide drum. It has a structure of an arc-shaped pad that comes into contact with it.

Function: With the above-described configuration, the tape is pressed against the head side by the pad, and the contact force is particularly strong on the entry and exit sides, and weaker in the center, thereby minimizing the increase in load and ensuring reliable contact. This will result in a close contact.

Embodiment Hereinafter, a rotary head type recording/reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a top view of essential parts of a rotary head type recording/reproducing apparatus according to a first embodiment of the present invention.

In Figure 1, 5 is a pad, e is a pad mounting plate, 7 is a pad arm, 8 is a pad plate mounting shaft, and pad mounting plate 6
is rotatably supported on the bad arm γ. A pad arm support shaft 9 is installed on a chassis (not shown) and rotatably supports the pad arm 9.

A pad arm spring 10 urges the pad arm 7 toward the guide drum 2. 11 is a tape loading guide roller, 12 is an inclined guide bin, and 13 is a loading guide lock in which the loading guide roller 11 and an inclined guide pin 12 are installed, and the upper and lower guide drums are used to load and unload the tape 4 into a cassette (not shown). 2. Wrap the tape 4 around the tape 4 and guide the tape running in this state.

A guide hole 14 is provided on a chassis (not shown) and guides the movement of the loading guide block 13. A stopper 16 regulates the movement position of the pad arm T during operation, and obtains appropriate pressure by elastic deformation of the pad mounting plate 6 and pad 5. Shame indicates the radius of the guide drum.

FIG. 2 is a front view of the main part.

FIG. 3 shows the top surface of the pad part in its free state. Rp indicates the radius of the contact surface of the pad 5, which is made smaller than the radius of the guide drum due to the elasticity of the pad mounting plate 6, and is At the same time, strong and reliable contact is made near the entrance and exit sides of the guide drum 2.3, so that an appropriate contact force can be obtained.

The operation of the rotary head type recording/reproducing apparatus constructed as above will be explained below with reference to FIGS. 1 and 2.

First, in FIG. 1, the tape has been loaded and is ready for recording and playback, and the pad 6 is connected to the tape guide drum 2,
3 and is in working condition.

Since Rd > Rp, a strong contact force can be obtained on the entry side and the exit side, and a reliable tape touch can be obtained. In addition, in the tape unloading state, the pad arm 7 is returned to its original position by the movement of the loading block 13, as shown by the dotted line in the figure.
Pad 5 is also in the non-active position. Figure 2 shows the pad mounting plate 6.
A part of the lead 4 is shown at the bottom, so that the tape running state can be visually confirmed.

As described above, according to this embodiment, the radius of the arc-shaped pad that abuts along the arc of the tape guide drum is smaller than the radius of the guide drum. Since a part of the lead portion 1 is made visible under the pad, the state of the tape 4 along the lead during running can be visually confirmed, and running adjustment can be made easily. In addition, pad operation can be controlled in conjunction with tape loading.
The interlocking mechanism can also be configured extremely easily.

Incidentally, when fast forwarding or rewinding the tape while the tape is being loaded, it is possible to reduce the load by moving the pad 6 back a little.

FIG. 4 is a top view of an embodiment in which the pads 5 are provided at two locations, an inlet side and an outlet side. By doing this, it is possible to suppress the increase in load due to the butt contact at the central portion where a relatively stable balance can be obtained.

FIG. 6 is a sectional side view of a main part showing the state of contact between the tape and the head on the tape entry side in the embodiment of the present invention shown in FIG. Similarly, reliable tape touch can be obtained on the tape exit side.

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

FIG. 6 is a sectional side view of a main part of a tape guide drum section of a rotary head type recording/reproducing apparatus showing a second embodiment of the present invention. In the figure, 16 is an upper fixed guide drum, 17 is a lower fixed guide drum, and 18 is a rotating disk. The head 1 is attached to the rotating disk 18, and the head 1 is attached to the rotating disk 18, and the head 1 is inserted into the slit provided between the upper and lower fixed guide drums 16 and 17. It is designed to rotate.

With the above configuration, during recording and reproduction, the head 1 rotates together with the rotating disk 18, and the upper and lower guide drums 16
．． Since 17 is fixed, the force required to drive the rotating disk is extremely small. Further, since the pad 6 is supported by the upper and lower fixed drums 16 and 17, there is little vibration generated in the pad 5, and therefore stable contact can be obtained.

In carrying out the present invention, the amount of head protrusion can be made much smaller than in the past, and the amount of protrusion from the outer circumferential surface of the guide drum can be made zero or negative. Extends the lifespan of

This is preferable from the viewpoint of protecting the head.

Effects of the Invention As described above, the present invention includes upper and lower tape guide drums on which a rotating head rotates along the outer peripheral surface thereof, and an arc-shaped pad that abuts along the arc of the tape guide drum, and further includes a pad mounting plate. is made of an elastic material and its radius of curvature is smaller than the radius of the tape guide drum, ensuring reliable head contact and making it possible to control pad movement in conjunction with the movement of the tape loading block, making it extremely easy to use. It can be configured as follows.

In addition, since it is not easily affected by the magnitude or unevenness of tape tension on the entrance side, delicate precision is not required for the shape of the head tip, and it can be used in popular equipment. .

[Brief explanation of the drawing]

FIG. 1 is a top view of the main parts of a rotary head type recording/reproducing apparatus according to the first embodiment of the present invention, FIG. 2 is a front view of the main parts, FIG. 3 is a top view of the pad section in a free state, and FIG. The figure is a top view of another embodiment of the pad section in a free state, and FIG.
FIG. 6 is a sectional side view of the main parts of a rotary head type recording/reproducing apparatus according to a second embodiment of the present invention, FIG. 7 is a top view of a general rotary head type recording/reproducing apparatus, and FIG. 8 is its front view. , No. 9
The figure is a sectional side view of a main part showing how a tape is touched in a conventional rotary head type recording/reproducing device. 1... Head, 2... Upper tape guide drum, 3... Lower tape guide drum, 4...
...Tape, 5...Pad, 6...
- Pad mounting plate, 13... Loading block, 18... Rotating disk. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
--Head Figure 3 Figure 4

Claims (7)

[Claims] (1) A rotating head comprising a rotating head, upper and lower tape guide drums on which the head rotates along its outer peripheral surface, and an arc-shaped pad that abuts along the arc of the tape guide drum. type recording and reproducing device. (2) Place the pad on the side where the tape enters the tape guide drum,
2. The rotary head type recording/reproducing device according to claim 1, wherein the output side is made to abut more strongly than other parts. (3) The rotary head type recording/reproducing device according to claim 1, wherein the mounting plate to which the pad is attached is made of an elastic material. (4) The rotary head type recording and reproducing apparatus according to claim 3, wherein the radius of curvature of the pad mounting plate in a free state is smaller than the radius of the tape guide drum. (5) The rotary head type recording and reproducing apparatus according to claim 1, wherein the contact force of the pad is determined by the amount of deformation of the pad and the pad mounting plate to which the pad is attached. (6) The rotary head type recording and reproducing apparatus according to claim 1, wherein at least a portion of the lead provided on the tape guide drum can be visually confirmed from behind the pad. (7) The rotary head type recording and reproducing apparatus according to claim 1, wherein the operation of the pad is controlled in conjunction with the movement of the tape loading block.