JPS60237668A - Loading change-over mechanism for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To decrease driving force by dividing a system for transmitting the driving force of a loading motor to two driving systems and providing further a clutch mechanism for connecting/disconnecting the transmission routes between both driving systems. CONSTITUTION:The driving system is divided to the 1st driving system to which the driving force is transmitted from the 1st gear 37 and the 2nd driving system to which the driving force is transmitted from the 2nd gear 41. The clutch mechanism for connecting/disconnecting the transmission routes between the 1st gear 37 and the 1st driving system as well as between the 2nd gear 41 and the 2nd driving system is further provided thereto. A clutch lever 40 of the clutch mechanism has a driving pin 40a engaged with the groove 39a of a plate cam 39 so that the lever is oscillated around the axis within a certain turning angle by the operation of the cam 39. The change-over of the operating condition is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a loading mechanism of a magnetic recording/reproducing device.

[Prior Art] In general, the configurations described below are known as the configurations conventionally employed as loading mechanisms for home VTRs. FIG. 1 is a plan view showing a schematic configuration of the loading mechanism. In the figure, 1 is a rotating drum equipped with a magnetic head. 2 is a capstan motor that drives the magnetic tape. 3 is a reel motor that drives the reel for winding the magnetic tape. to drive.

Reference numeral 4 denotes a boot, which is fixed to the output shaft of a loading motor that drives the loading mechanism. A large pulley 6 is driven from the pulley 4 via a belt 5, and its rotation is caused by bevel gears 7, 8, small gears 10, . The signal is transmitted via the gear 11 and the worm 13 to a worm wheel 14 and a cam gear 15 provided with a cam groove.

Note that the bevel gear 8 is press-fitted and fixed to the shaft 9, and the gear 11
is press-fitted onto the shaft 12. A mode switch 18 has a gear portion 18a, and detects the rotational position of the cam gear 15 by means of gears 16 and 17.

19, 20, and 21 are plate cams, respectively, and cam gear 1
It engages with the cam groove No. 5 and performs operations such as opening and closing various brakes, pressing pinch rollers, and ejecting cassette tapes. 2
Reference numeral 9 denotes a lever, which has a cam groove 1 formed in the cam gear 15.
5a, and can be operated by rotation of the cam gear 15.

Further, the rotation of the large pulley 6 is also transmitted to the bevel gear 22,
Umbrella mWK2315 that meshes with this and shaft 2 press-fitted
4. The clutch 25 rotates.

A clutch 26, which can freely slide on the worm 21 in the axial direction but is locked in the rotational direction, is rotatably located on the shaft 24, and the worm wheel 2 engages with the worm 27, and also holds the magnetic tape. It meshes with a loading ring 46 equipped with a tape guide for wrapping around the rotating drum 1.

However, in the state shown in FIG. 1, the rotation of the pulley 4 is caused by the rotation of the loading ring 4 because the clutch 26 is rotatable with the shaft 24 even though the clutch 25 is rotated.
6 is not transmitted.

Next, the state in which the rotation of the pulley 4 is transmitted to the loading ring 46 will be explained using FIG. 2.3.4.

FIG. 2 shows a perspective view of the peripheral part of the clutch 25,26. The holding plate 33 rotatably supports the shaft 24. Moreover, the slide plate 31 equipped with the guide pin 34 has a guide groove 31a, and the guide pin 3 on the holding 1ij33 has a guide groove 31a.
4 , and is slidably attached to the holding plate 33 by a tension spring 32 .

Further, the slide plate 31 includes a bent portion 31b that engages with the groove portion 26a of the clutch 26 and a bent portion 31C that comes into contact with the lever 30.

As is clear from the figure, when the lever 29 operates, the slide plate 31 in contact with the lever 30 moves against the force of the tension spring 32, and the clutch 26 moves in the axial direction, causing the claw portion 26b and the clutch 26 to move in the axial direction. The claw portion 25a of the clutch 25 meshes with the clutch 25. As a result, the rotation of the pulley 4 is transmitted to the loading ring 46 via the worm 27, and the magnetic tape is wound around the rotating drum 1 by the tape guide attached to the loading ring 46, thereby performing recording and reproducing operations. will be carried out.

Furthermore, when the lever 29 returns to the state shown in FIG. 1, the slide plate 31 is returned to the state shown in FIG.
6 is not transmitted. FIG. 3 is a plan view showing this state.

FIG. 4 shows a state in which the lever 29 is moved by the cam groove 158 of the cam gear 15 and the rotation of the clutch 25 is transmitted to the clutch 26 and the worm 27.

As can be seen from the above explanation, this mechanism consists of cam gear 15.
The rope interring 46 is configured to be operated in response to the rotation of the rope. The loading mechanism of a magnetic recording and reproducing device does not simply wind the magnetic tape around a rotating drum, but also handles the magnetic tape supply, the brake that controls the single take-up reel and the capstan motor, the pressing operation of the pinch roller, and the ejection of the cassette tape. It also means to do the following. Furthermore, the timing of these operations is often different from the timing of the operation of attaching the magnetic tape to the rotating drum. In other words, the cam gear 15 merely rotates while winding the magnetic tape around the rotary drum 1, and does not operate the plate cam 19.20.21.

The cam gear 15 has a lever 29 and a plate cam 19°20.
Since the cam ih for operating the cam 21 is formed, the rotatable angle is limited. Since each cam follower is formed within that limited angle, the greater the angle at which the cam gear 15 simply rotates, the greater the pressure angle of the cam follower, and the lower the reliability.
Requires large driving force.

[Summary of the invention] The present invention has been made to compensate for these drawbacks.
The system that transmits the driving force of the loading motor is 114
It is divided into 11 drive systems transmitted from the first gear and a second drive system transmitted from the second gear, and further divided into 11 drive systems transmitted from the first gear and the first drive system, and the second gear and the second drive system. 1 liter clutch that connects and disconnects the transmission path between each system
The present invention proposes a loading switching mechanism for a magnetic recording/reproducing device in which credibility is improved as much as possible by providing the magnetic recording/reproducing device.

[Embodiments of the Invention] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 5 is a plan view showing a schematic configuration of a loading switching mechanism according to the present invention, and corresponds to FIG. 1 showing a conventional example. Therefore, by assigning the same numbers to parts indicating similar configurations, redundant explanation will be omitted.

In the figure, the gear 36 is fixed to the output shaft of the loading motor. The first gear 37 and the second gear 41 mesh with the gear 36, and the gear 38 meshes with the bevel teeth 117.22.
．． It can be separated and connected to 42. The rotation of the bevel gear 22 is controlled by the bevel gear 23 and the worm gear 4 which are press-fitted onto the shaft 24.
A gear 44b integrated with the worm wheel 44a through 3
It is further transmitted to the idle gear 45 and drives a loading ring 46 equipped with a tape guide for winding the magnetic tape around the rotating drum 1. That is, a first drive system is formed. Furthermore, the rotation of the loading ring 46 is transmitted to the cam gear 48 via a gear 47 that meshes with it, and the cam gear 48 and the loading ring 46 rotate in synchronization.

Plate cam 39 is operated by cam gear 15.48 and drives clutch lever 40.

FIG. 6 is a cross-sectional side view of the main part showing the reduction system from the loading motor, and the rotation of the loading motor 51 is controlled by a slide gear 37 that meshes with a gear 36 fixed to the output shaft.
41 will be informed. This slide gear 37 is the first gear, and the slide gear 41 is the second gear. The slide gear 37.41 is movable in the axial direction of the shafts 49, 50, and is always held in the clutch lever 4 by means of a spring 52.53.
It is biased towards the 0 side. Further, as shown in FIG. 7, the slide gear 37.41 and the clutch gear 38.42 have clutch pawls 37a, 41a, 38a, 42a, respectively.
In FIG. 6, when the slide gear 37 is urged downward by the clutch lever 40 against the force of the spring 52, the slide gear 37 and the clutch gear 38 are connected and rotation is stopped. communicated. In the state shown in FIG. 6, the rotation of the loading motor 51 is transmitted to the shaft 9, but not to the shaft 24. Furthermore, it is clear that the operating state of the clutch lever 40 changes as it moves in the direction of the arrow in the figure.

In FIG. 5, the clutch lever 40 has a drive pin 408 engaged with the groove 39a of the plate cam 39, and the shaft 5
4 within the range of rotation angle formed by the operation of the plate cam 39, making it possible to switch the operating state.

The above-mentioned operation switching will be explained in detail step by step.

In FIG. 8, the rotation of the loading motor 51 is transmitted to one bevel gear 7, but not to the other bevel gear *22, as shown in FIG. 9, which shows the state of the clutch section. In other words, the cam gear 15 rotates, but the cam gear 4
8 will not work.

As shown in FIG. 8, when the loading motor 51 continues to rotate, the cam gear 15 continues to rotate, and is engaged with the cam groove 15a formed on the cam gear 15 and the guide pin 55 provided on the plate cam 39. By operating the plate cam 39 and operating the clutch lever 40, the state is switched to the states shown in FIGS. io and i1.

In the state shown in FIG. 10.11, the rotation of the loading motor 51 simultaneously drives the bevel gears 7 and 22, and the rotation drives the cam gear 15.48. When the operation continues, the plate cam 39 is operated by a cam groove 48a formed on the cam gear 48 and a guide pin 56 that engages with this cam groove and is provided on the plate cam 39, and further drives the clutch lever 40. , the state shifts to the state shown in FIGS. 12+13.

The state of No. 12.1311 is the rotating motor 5.1
The rotation is transmitted to the umbrella f1 wheel 22, but not to the umbrella wheel 7. This indicates that the rotation of the cam gear 15 is stopped.

It is clear from the above explanation of 4.1 that if the loading motor 51 continues to rotate roughly, the operation opposite to that described above will occur.

In this way, while the cam gear 48 is rotating, in other words, while the magnetic tape is being wound around the rotating drum, the cam gear A1
5 does not perform unnecessary rotation, and the rotation angle obtained thereby is transferred to other mechanisms, such as plate cams 19, 20, 21.
The pressure angle of the cam follower can be reduced by using it for the operation of the cam follower. Therefore, reliability can be increased as much as possible, and driving force can also be reduced. It goes without saying that it is also advantageous for downsizing.

[Effects of the Invention] As is clear from the above description, the present invention provides the following excellent effects.

That is, the system for transmitting the driving force of the loading motor is divided into a first drive system transmitted from the first gear and a second drive system transmitted from the second gear, and further divided into a first drive system transmitted from the first gear and a second drive system transmitted from the second gear. Clutch II that connects and disconnects the transmission path between the drive O system and the second gear and the second drive system, respectively.
Since the I structure is provided, reliability can be increased and driving force can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a schematic configuration of a conventional loading mechanism, Fig. 2 is a perspective view showing the main parts of Fig. 1, Figs. 3 and 4 are plan views showing operating states, and Fig. 5. 6 is a plan view showing an embodiment of the schematic configuration of the loading mechanism according to the present invention; FIG. 6 is a cross-sectional side view showing the main parts thereof;
FIG. 7 is a perspective view showing one embodiment of the clutch portion of the loading nlI according to the present invention, and FIGS. 8 to 13 are a plan view and a side view, respectively, showing each operating state. In the figure, numerals 37 and 41 are slide gears as the first gear and second gear, respectively, and numerals 15.39 and 40.48 are a cam gear, a plate cam, a clutch lever, and a cam gear 17 as steering means, respectively. Agent Masuo Oiwa Figure 1 Figure 2 Figure 5 Figure 6

Claims (1)

[Claims] A loading mechanism for a magnetic recording and reproducing device, comprising: a first gear and a second gear driven by a loading motor; and a loading means for winding a magnetic tape around a rotating drum. The first part is removably engaged.
a second drive system that removably meshes with the second gear and includes a brake control means, a pinch roller pressure means, a cassette tape ejection means, etc.; and a second drive system that is transmitted from the first gear. a first cam driven by a driving force; a second cam driven by a driving force transmitted from the second gear; and a second cam that engages with the first cam and the second cam to connect the first gear and the second cam. A loading switch of a magnetic recording and reproducing apparatus, characterized in that the magnetic recording and reproducing apparatus is equipped with a switching means for switching between a state of engagement with the first drive system and a state of engagement and disengagement between the second gear and the second drive system.
IR structure.