JPS5832269A - Magnetic recorder and reproducer - Google Patents

Abstract

PURPOSE:To avoid an abnormal tension and slack from being given to a magnetic tape, when tape loading is finished within a limited time, by providing a selector gear shaken in latching with a gear with a cam and the cam itself. CONSTITUTION:The rotation of a driving source 3 is delivered to a gear 6 with a cam via a belt 4 and a gear 5. A spiral recess groove is provided at one surface of the gear 6 and since a cam follower shaft 9 implanted to a sector gear 8 is inserted to the groove and guided, the sector gear 8 is shaken through the rotation of the gear 6 and loading gears 12 and 13 are driven. Through the shaken sector gear 8 guided to the groove of the gear 6, the loading speed is quickened until a magnetic tape is loaded to a rotary drum with a specified angle and the speed slows down, allowing to prevent an excessive tension to the magnetic tape after the loading at a specified angle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device, particularly its magnetic tape guide mechanism #C, and is designed to prevent abnormal tension or slack from occurring in the magnetic tape at the same time as tape loading is completed within a limited time. This is what I did.

Conventionally, the speed from the start to the end of tape loading is approximately constant;
There were problems in that an abnormal tension was applied to the magnetic tape when loading the tape, and the tape became slack due to the inertia of the reel in the cassette at the moment loading was completed. It is difficult to solve this problem by controlling the voltage of the motor or the like that is the drive source of the tape loading means and changing the motor speed.

The present invention uses a cam gear and a sector gear to prevent excessive tension on the magnetic tape, without changing the voltage of the drive motor, and also prevents the magnetic tape from loosening at the moment the tape is loaded. The present invention proposes a magnetic recording/reproducing device that can completely load a magnetic tape within the device.

Hereinafter, one embodiment of the present invention will be explained based on the drawings. In Figure 1, the magnetic tape 0) in the cassette (1) is pulled out to the dot-dashed line by the intermediate pull-out means (not shown).
E is performed. Recording/reproduction is performed at the time II (operation intention) indicated by the %1 dotted line in the diagram li1.

The mechanism leading from operation 1 to operation 8 is shown in FIG. 3, in which rotational motion is transmitted from drive I [-) to belt 0) and gear (5) to cam gear (-).

As shown in No. 8g, a spiral concave groove (1) is provided on the - face of the cam gear (1), and the cam gear (2) installed in the sector gear # is inserted into this concave groove (1). are fitted and guided.

In Fig. 8, at the point P~1$00, the concave groove (η is formed in the same radius groove (]a) and the sector gear) does not operate, and as shown in Fig. 94 (,110@ onwards, the recording/reproducing state is activated). In the rotation up to 5,400 degrees, the concave groove (υ) is formed into a rapidly increasing radius groove (C) and a gradually increasing radius groove (C) whose radius changes from moment to moment. The gear 1 (2) is rotated in the direction (Fig. 2). The sector gear in Fig. 2 has a gear cutter at the tip, and is a middle gear. The external teeth of the relay gear (2) mesh with the loading gear #, and the rotational force is transmitted from the loading gear A (2) to the loading gear BQ, 1. The rotation direction of each is in the direction of hot water (-) to θ).The loading gear has the same rotation center as B11 (2) (
And loading gear.

Loading 111 arm o4 fixed to B# (2)
A loading arm 04 is connected to the other end of the loading arm 04 so as to be freely rotatable. Also, the loading l!
! A base (2) is connected to the other end of the arm CAof so as to be freely rotatable, and the other end of the base (to) mw (2) is provided with a guide post - a ring (tortoise lS). is provided. At the intermediate loading point, the guide posts (2)-(2) are located in the cassette Q (as shown by 1111tD#--), and the recording/playback button (I
When I (not shown) is pressed, the base (to)suke turns turtle 1 for the first time.
The state l shown by the dotted line in the figure! Move to Baba's location.

' In the process of moving from starting operation l to moving f1-1, operation 8 (indicated by the solid line in Figure 1) until it wraps around the rotating shunder (2) to an arbitrary angle g (Figure 1) is a fast loading. It is done at speed. In the process from operation 8 to the completion of loading, the winding around the rotating cylinder a is increased and abnormal tension is applied to the magnetic tape (2), and at the moment when loading is completed, the winding in the cassette (1) is increased. Abnormal tape slack occurs due to the moment of inertia of the tape. However, this failure occurs from 8600 to 8600 in Figure 1114 after operation 8 until the loading is completed.
This can be alleviated by forming the concave groove (7) of the cam gear (2) into a gradually increasing radius groove (C) so that the inclination angle θ becomes gentle, as shown in 54G'.

According to the present invention, the loading speed is increased until the magnetic tape is loaded onto the rotating drum at a predetermined angle, and thereafter it is decelerated, thereby preventing excessive tension on the magnetic tape after it is loaded at a predetermined angle. In addition, the present invention has an advantage in that it prevents the magnetic tape from loosening at the moment the tape is loaded, and can achieve this with a simple configuration of a cam gear and a sector gear without having to control the voltage of the drive motor.

[Brief explanation of the drawing]

Fig. 1 is a plan view illustrating the loading operation of a magnetic recording/reproducing device; the first intention is an underwater schematic plan view showing one embodiment of the present invention; Fig. 8 (a) is a mounting plane 1iis and a sectional view; , I [Figure 4 is a graph to explain the loading time (speed). - Cassette, (2) - Magnetic tape, (3) - Drive source 1, (2) - Gear with cam, (7) - Concave groove, (8) - Sector gear.轡(to) - Road gear gear, B, (ro) (2)...
・Loading 1st Anim, (To) (B) - Loading 1111 arm, (2) ~ (2) - Guide post agent Yoshihiro Morimoto Figure 3 (iL) Figure 4 -9:! Between the front row and the 4th side

Claims (1)

[Claims] 1. A gear with a cam that is rotationally driven by a drive source is provided, and a sector gear that engages with the cam of the gear with a cam to swing is provided to control the rotation of the loading gear that drives the loading arm. The oscillating speed of the sector gear is connected in conjunction with the oscillation of the gear, and the shape of the cam of the cam gear is adjusted so that the magnetic tape pulled out from the cassette is loaded onto the rotating drum at a predetermined angle. The sector gear is configured to have a shape that reduces the swinging speed of the sector gear so as to slow down the loading speed after loading the magnetic tape on the rotating drum to a predetermined angle and until the loading is completed, within a limited time. A magnetic recording/reproducing device characterized in that loading of a magnetic tape is completed in a single step.