JPS58100259A - Reel turntable device - Google Patents

Abstract

PURPOSE:To obtain large degree of freedom of the constitution of a reel turntable device and to reduce the thickness of the device by providing reel turntables and a torque limiter part separately and in parallel. CONSTITUTION:A reel turntable 30 for driving a reel which takes up a magnetic tape is held by a reel spindle 34 implanted in a base plate 32 vertically, and a limiter spindle 38 is implanted at prescribed distance from said spindle 34; and on this spindle 38, the torque limiter part 48 including a limiter gear 40 having a boss 45 in one body, limiter felt 42 as a turning force transmission member, limiter roll 44, and spring 46 is supported pivotally. The limiter roll 44 of the torque limiter part 48 is fitted loosely to the outer circumference of the boss part 45 of the limiter gear 40 and held in press contact with the limit gear 40 rotatably by a coil shaped spring 46 through the limiter felt 42.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel stand device for a device using magnetic tape (hereinafter referred to as a magnetic tape device) such as a tape recorder or a video tape recorder, and particularly to a reel stand device that contributes to making the magnetic tape device thinner. All equipment will be provided.

An example of a conventional reel stand device is shown in FIG. To explain this, a reel stand 10 that drives a reel (not shown) for winding a magnetic tape has a reel shaft 1 mounted on a substrate 12.
It is rotatably held at 4. The reel stand 10 is composed of an upper reel stand 16 that is directly connected to the reel and rotates, and a limiter gear 18. The upper reel stand 1e and the limiter gear 18 are press-connected by a coiled spring 22 via a limiter felt 2o. , the above limiter gear 1
When the torque transmitted to the limiter felt 20 exceeds the torque preset by the spring 22, the limiter felt 20
The structure is such that the signal slips between the upper reel stand 16 or the limiter gear 18 and is not transmitted to the upper reel stand 16.

Upper = b +) - In the fast winding mode which requires torque at a constant rotation speed, the drive roller 24 is pressed against the outer periphery of the upper reel stand 16 to transmit driving force. The number of revolutions changes depending on the winding diameter of the magnetic tape, and in playback mode where it is necessary to wind with a constant torque, drive gear 2
6 meshes with the limiter gear 18, and the limiter gear 18
This serves as a gateway for transmitting rotational force to the upper reel stand 16 via 20 limiter felts.

However, in this structure, the upper reel stand 1
6. Limiter felt 20. Limiter gear 18. Since the spring 22 is disposed in the axial direction of the reel stand 10, the height of the reel stand 10 in the axial direction becomes high, and as a result, it is difficult to reduce the height of the entire magnetic tape device.

The present invention improves these points and provides a complete reel stand device that allows the magnetic tape device to be made thinner.

The present invention will be explained below based on the embodiment shown in FIG. In FIG. 2, a reel stand 30 for driving a reel (not shown) for winding a magnetic tape is installed vertically on a substrate 32 and is rotatably held by a reel shaft 34 (b). There is. The board 32 also includes the reel shaft 34.
A limiter shaft 38 is implanted at a predetermined distance from the limiter shaft 38, and a limiter gear constituting a first rotating member integrally has a boss portion 46 loosely fitted therein. 40. (b) Limiter felt 42 which is a power transmission member. Limiter roller 44, which is the second rotating member. A torque limiter section 48 including a spring 46 is rotatably supported.

The limiter roller 44 of the torque limiter section 48 is loosely fitted around the outer periphery of the boss section 46 of the limiter gear 40, and is rotatably held by a coiled spring 46 on the limiter gear 4o via a limiter felt 42.

The limiter felt 42 is interposed so as to slip on at least one of the limiter gear 40 and the limiter roller 44. Further, a gear portion 50 formed on the outer periphery of the limiter roller 44 meshes with a gear portion 36 formed on the outer periphery of the reel stand 30.

A rubber drive roller & is mounted on the outer peripheral part of the limiter roller 44 other than the part where the gear part 60 is formed, and a drive gear 64 is selectively pressed or engaged with the outer peripheral gear part 41 of the limiter gear 4o. Each has a structure that transmits driving force. For example, in the fast winding mode, the drive roller 52 presses against the outer periphery of the limiter opening 44, and the driving force is transmitted to the reel stand 3o via the limiter roller 44.

On the other hand, depending on the winding diameter of the magnetic tape, the reel stand 3
In a reproduction mode in which the number of revolutions at zero is increasing and the reel stand 30 needs to be driven with a constant torque in order to wind the magnetic tape with a constant torque, the drive gear 64 selectively driven by the reproduction mode is It meshes with a gear portion 41 formed on the outer periphery of the limiter gear 40 to transmit driving force.

The rotation of the limiter gear 40 is transmitted to the limiter roller 44 via the limiter felt 42, but in this case, the winding diameter of the magnetic tape and the magnetic tape transport means (not shown) are determined.
The limiter roller 44 after passing through the reel stand 3o determined by
Since the rotation speed of the drive gear 64 is set so that the rotation speed of the limiter gear 40 is greater than the rotation speed of the limiter gear 40, the limiter roller 44 and the limiter gear 4o slip at the contact portion with the limiter felt 42. , the driving force is transmitted to the limiter roller 44 with a torque determined by the pressure force of the spring 46, and the reel stand 3o
winds the magnetic tape with a constant torque.

In addition, in FIG. 2, 43 is a member that also functions as a stopper and adjusts the spring pressure force.

As described above, the reel stand device according to the present invention has a reel stand (3 o
) and the torque limiter section (48) are separated and arranged in parallel, not only can the reel stand device be made thinner, but also
Since the torque limiter section can be placed at any position with the distance between the shafts as a radius to the roll base, a large degree of freedom can be given to the construction of the roll base of the magnetic tape device.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of a conventional reel stand device;
The figure is a sectional view showing a reel stand device according to an embodiment of the present invention. 30... Reel stand, 32... Board, 3
4...Reel shaft, 38...Limiter shaft, 4o...Limiter gear, 42...--Limiter felt, 44...Limiter roller , 46... Spring, 48... Torque limiter section, 62... Drive roller, 5
4... Drive gear. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A reel stand rotatably supported on a shaft so as to be able to wind up a magnetic tape, a first rotating member rotatably arranged in parallel in the vicinity of the reel stand, and coupled to the reel stand so as to be able to transmit rotation. and a second rotating member arranged to rotate coaxially with the first rotating member and separately from the first rotating member, and a second rotating member that rotates between the first rotating member and the second rotating member. Torque limiter means including a rotational force transmitting member interposed between the members so as to be able to slip with respect to at least one of the members, and a first torque limiter means of the torque limiter means.
and a second co-rotating member.
A reel stand device characterized in that the rotating member is selectively rotationally driven to transmit different driving forces to the reel stand.