JPH04324153A - Reel disk for recording and reproducing device - Google Patents

Abstract

PURPOSE:To supply a reel disk in which a reel winding body and a reel can rotate in parallel against a standard surface without following to an inclination, even though the reel disk of a record and reproducing device and a reel hub of a tape cassette are inclined. CONSTITUTION:A diameter D3 of an outer peripheral surface 40a of the reel disk is made small such that a gap (d) between the outer peripheral surface 40a of the reel disk and an inner peripheral surface 3b of the reel hub is formed. Also a projection 41 projecting in the outside direction at the outer peripheral surface 40a of the reel disk is provided and the inner peripheral surface 3b of the reel hub 3 is brought into contact with the projection 41.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel disk for a recording/reproducing device used in a magnetic recording/reproducing device such as a VTR or DAT.

0002

[Prior Art] Conventionally, reel disks used in magnetic recording/reproducing devices such as VTRs and DATs have been used as shown in FIGS. 4 and 5.
The reel disc shown in Figure 1 has been proposed. Figure 4
5 is an enlarged view of the coupled state of the magnetic tape winding body 2, reel hub 3, and reel disk 4 in the magnetic tape cassette 1. FIG. - It is a sectional view taken along the line V-V in FIG. 4 with the sliding sheet 5 attached to the doors 1a and 1b.

Although not shown, the magnetic tape cassette 1 has a structure similar to that of a normal video cassette, in which a magnetic tape is wound around a supply reel (reel hub). The magnetic tape that forms the winding body is guided by a tape guide and runs near the rotary lid on the front of the cassette and the loading means insertion hole, and is connected to the take-up reel (reel). The tape is wound around the tape hub) to form a tape roll on the winding side.

As clearly shown in FIG. 5, the reel hub 3 has a magnetic tape 6 wound around its outer peripheral surface 3a and a tape wound body 2.
In this state, the upper and lower cassette halves 1a, 1b of the magnetic tape cassette 1 are guided by the sliding sheet 5 provided on the upper and lower cassette halves 1a, 1b, and the elastic force of the sliding sheet 5 causes the upper and lower cassette halves 1a, Positioning in the height direction is performed within 1b. Further, horizontal positioning is performed by a method not shown.

[0005] The magnetic tape cassette 1 having such a configuration has V
When inserted into a magnetic recording/reproducing device such as a TR, the rotating lid is opened by moving the magnetic tape cassette 1 to the operating position, and the loading means is inserted into the loading means insertion hole. The supply side and take-up side reel disks 4 are inserted into the reel disk insertion holes of the supply and take-up side reel hubs 3. Inner peripheral surface 3 of the reel hub 3, which serves as the reel disk insertion hole
A well-known radially formed engagement groove 3c is bored in b, which engages with a claw portion 4b provided at the lower part of the outer peripheral surface 4a of the reel disc 4, thereby transmitting the winding force. The rotation of the reel disk 4 is controlled by the reel hub 3.
Additionally, the rotation of the reel hub 3 is transmitted to the reel disc 4.

Furthermore, after the brakes of the reel hubs 3 on the supply side and take-up side are released, the loading means is moved.
The magnetic tape 6 is fed out from the magnetic tape cassette 1,
Recording and reproducing operations are performed by attaching a rotating head over a predetermined range to a guide drum containing a built-in rotating head.

[0007]

[Problems to be Solved by the Invention] In the above-mentioned reel disk for the recording and reproducing device, it is important to check the mechanical accuracy of the magnetic recording and reproducing device and the magnetic tape cassette, such as the perpendicularity of the reel disk on the supply side and the winding side. Although this is not a problem when the magnetic field is high, there is a particular risk that problems may arise due to recent magnetic recording/reproducing devices, smaller and lighter magnetic tape cassettes, thinner magnetic tapes, and higher density recording. .

FIG. 5 shows the reel disk 4 and reel hub 3.
This is a sectional view taken along the line V-V in FIG. 4 when the reel disk 4 is perpendicular to the reference plane and has a tilt of θ as shown in FIG. By inserting the reel disk 4 into the magnetic tape cassette 1, the abutting surfaces of the reel disk 4 and the reel hub 3 (the outer circumferential surface 4a of the reel disk 4 and the inner circumferential surface of the reel hub 3) Since the diameter D1 of the surface 3b) is in surface contact with the length L, the tape winding body 2 as well as the reel hub 3 similarly rotates with an inclination of θ in the state shown in FIG. do.

For this reason, the elastic force of the sliding sheet 5 cannot absorb the force, causing uneven rotation.When the magnetic tape comes into contact with the upper and lower flanges of the tape guide of the magnetic recording/reproducing device during loading operation, etc. Reel disks and reels of magnetic recording and reproducing devices can be damaged by contact with magnetic tape.
There is a risk that problems such as unevenness in the inclination θ of the magnetic tape winding body and an increase in tape running load may occur due to variations in the inclination θ of the hub.

0010

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides that a gap is formed between the outer circumferential surface of the reel disk and the inner circumferential surface of the reel disk insertion hole of the reel. In order to reduce the diameter of the outer circumferential surface of the reel disk, a protrusion that protrudes outward is provided on the outer circumferential surface of the reel disk so that when the tape cassette is installed in a recording/reproducing device, this The reel disk for a recording/reproducing device was constructed so that the protrusion and the inner circumferential surface of the reel disk insertion hole were in point contact on a cross section in the reel axis direction.

[0011]

[Function] The reel disk for a recording/reproducing device according to the present invention has a projection provided on the outer circumferential surface of the reel disk and an inner circumferential surface of the reel disk insertion hole when a magnetic tape cassette is installed. Because they make point contact on the cross section in the reel axis direction,
Even if the reel disk and reel hub are slightly inclined, the reel hub will rotate in the reel axis direction without following the inclination of the reel disk and reel hub, and the tape winding will continue. body,
The reel can rotate parallel to the reference plane.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a reel disk for a recording/reproducing apparatus according to the present invention will be explained based on the drawings. The reel disk for the magnetic recording/reproducing device according to this embodiment is shown in FIG.
, and the reel disk for a magnetic recording/reproducing device shown in FIG. However, the explanation thereof will be omitted.

FIG. 1 is an enlarged view of a state in which a magnetic tape winding 2 and a reel hub 3 in a magnetic tape cassette 1 similar to those shown in FIG. 4 are connected to a reel disk 40 according to this embodiment. FIG. 2 is a sectional view taken along the line II--II in FIG. 1 of the state in which the sliding sheet 5 is attached to the upper and lower cassette halves 1a and 1b, and FIG. 3 is a cross-sectional view for explaining the present invention. FIG. 3 is a cross-sectional view similar to FIG. In this embodiment, the reel hub and reel disk on the supply side and take-up side have the same configuration, so there is no distinction between the two, and the reel hub 3 and reel disk 4 are simply reel hub 3 and reel disk 4.
I will explain using 0. In the reel disc 40 of this embodiment, the diameter D3 of the outer peripheral surface 40a of the reel disc 40 is made small, and the outer peripheral surface 40a of the reel disc 40 and the reel disc insertion hole of the reel are made small. Inner peripheral surface 3b of reel hub 3
In addition, the outer peripheral surface 40a has a plurality of hemispherical protrusions 41 protruding outward at positions corresponding to the inner peripheral surface 3b at the same height. It is provided at a height position at the center of the tape when viewed from the tape width direction of the tape winding body 2.

Diameter D of outer peripheral surface 40a of reel disk 40
3 is determined from the diameter D1 of the abutment surface between the reel disk 4 and the reel hub 3 (the outer circumferential surface 4a of the reel disk 4 and the inner circumferential surface 3b of the reel hub 3) clearly shown in FIG. It is small and
The protrusion 41 of the reel disc 40 and the inner peripheral surface 3b of the reel hub 3
The diameter D2 of the abutting surface is approximately the same as the diameter D1 in FIG.

As clearly shown in FIG. 2, the reel disc 4
0 into the magnetic tape cassette 1, the protrusion 41 of the reel disk 40 and the inner circumferential surface 3b of the reel hub 3 collide at a point, and the reel hub 3 cannot be positioned in the horizontal direction. It will be done. Further, the claw portion 40b provided at the lower part of the outer circumferential surface 40a of the reel disk 40 engages with the engagement groove 3c formed in the inner circumferential surface 3b of the reel hub 3, and the winding force is increased. A coupling is configured to transmit the rotation of the reel disk 40 to the reel hub 3, and the rotation of the reel hub 3 to the reel disk 40.

Further, after the magnetic tape cassette 1 is installed in the device and the brakes on the supply side and take-up side reel hubs 3 are released, the magnetic tape 6 is moved by the movement of the loading means.
is unwound from the magnetic tape cassette 1 and attached to a guide drum containing a rotary head over a predetermined range for recording and reproducing operations.

When the reel disk rotates, even when the reel disk 40 is tilted by θ as shown in FIG. 3, and when the reel hub 3 is not vertical, Inner peripheral surface 3b of reel disk insertion hole and reel disk 40
A distance d is formed between the reel disk 40 and the outer peripheral surface 40a of the reel disk 40, and a protrusion 41 that protrudes outward is provided on the outer circumferential surface 40a of the reel disc 40. The circumferential surface 3b makes point contact on the cross section in the axial direction of the reel.

Therefore, the reel hub 3 rotates while rotating in the axial direction around the contact point without following the inclination of the inner circumferential surface 3b of the reel disk 40 and the reel hub 3. −
The tape winding body 2 and the reel hub 3 are guided by the sliding sheet 5 and can rotate in parallel to the upper and lower cassette halves 1a, 1b and the reference plane.

Although a plurality of hemispherical protrusions 41 are provided as the protrusions 41 of the reel disk 40 in the above-mentioned embodiment, the reel shaft is not limited to hemispherical protrusions such as cones and triangular pyramids. Other protrusions including annular protrusions may be used as long as the protrusions have a structure that makes point contact on the cross section in the direction.

Furthermore, the protrusion 41 of the reel disk 40 is provided at the tape center height position when viewed from the tape width direction of the tape winding body 2, but it When sacrificing the amount of rotation, it is not necessary to provide the tape at the center height position.

Furthermore, as described above, the reel disk drives a magnetic tape cassette in which the built-in supply side reel and take-up side reel have the same configuration, but only the supply side reel is driven. It can also be used as a reel disk, or as a cartridge with a built-in single reel, a cassette, etc.

[0022]

As described above, in the reel disk for a recording/reproducing device according to the present invention, a gap is formed between the outer circumferential surface of the reel disk and the inner circumferential surface of the reel disk insertion hole, A protrusion protruding outward is provided on the outer peripheral surface of the reel disc, and this protrusion and the reel make point contact on the cross section in the axial direction of the reel. Even if the inner circumferential surface of the reel disk and reel hub are slightly tilted, the reel hub will rotate without following the inclination of the inner circumferential surfaces of the reel disk and reel hub, and the tape winding body and reel will rotate. Since it can rotate parallel to the reference plane, there is no step in the tape winding, which reduces uneven rotation and tape running load, and prevents damage to the magnetic tape. It has the effect of being able to do things.

Furthermore, when the protrusion is provided at the height of the center of the tape when viewed from the tape width direction of the tape roll,
The amount of rotation of the tape winding body and reel in the reel axis direction can be increased.

[Brief explanation of drawings]

FIG. 1 is an enlarged view showing a state in which a reel disk, a tape winding body, and a reel are combined in one embodiment of a reel disk for a recording/reproducing apparatus according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1 with a sliding sheet attached to the cassette case.

FIG. 3 is a sectional view similar to FIG. 2 for explaining the present invention.

[Figure 4] Reel disk and tape of a conventional recording/playback device.
FIG. 2 is an enlarged view showing how the tape cassette is connected to the tape winding body and reel.

[Fig. 5] A conventional recording and reproducing device using a reel disk, with a sliding sheet attached to the cassette case.
5 is a sectional view taken along line V-V in FIG. 4. FIG.

FIG. 6 is a sectional view similar to FIG. 5, using a reel disk of a conventional recording/reproducing device, for explaining the present invention.

[Explanation of symbols]

1 Magnetic tape cassette 1a Upper cassette half 1b Lower cassette half 2 Magnetic tape winding body 3 Reel hub 3a Outer circumferential surface of the reel hub 3b Inner circumferential surface of the reel hub (reel disk insertion hole )
3c Reel hub engagement groove 4 Reel disk 4a Reel disk outer circumferential surface 4b Reel disk claw portion 5 Sliding sheet 40 Reel disk 40a Reel disk outer circumferential surface 40b -L disc claw part 41 protrusion

Claims (2)

[Claims] Claim 1: When a tape cassette containing a reel hub around which a tape-shaped recording medium is wound is installed in a recording/reproducing device, a reel disk inserted in the center of the reel hub is inserted. The lead of the recording/reproducing device connects with the hole and transmits the winding force.
In the reel disk, the diameter of the outer circumferential surface of the reel disk is made small so that a gap is formed between the inner circumferential surface of the reel disk insertion hole of the tape cassette and the outer circumferential surface of the reel disk. At the same time, a projection protruding outward is provided on the outer peripheral surface of the reel disk, so that when the tape cassette is installed in a recording/reproducing device, the projection and the inner peripheral surface of the reel disk insertion hole are connected to each other. 1. A reel disk for a recording/reproducing device, characterized in that the reel disk is configured to make point contact on a cross section in the axial direction of the reel. 2. The protrusion provided on the outer peripheral surface of the reel disk is provided at a height position at the center of the tape when viewed from the tape width direction of the attached tape cassette. Reel disc for recording/playback equipment.