JPS63222362A - Tape guide mechanism - Google Patents

Abstract

PURPOSE:To reduce the number of parts to miniaturize a mechanism by providing cams, with which respective tape guides are brought into contact and are guided to guide plates to be moved, on guide plates which should not be moved of tape guides. CONSTITUTION:Guide based 6 and 9 are moved along the periphery of a cylinder while leading out a tape 4 stored in a cassette. The guide base 6 has an upper left end face 6c brought into contact with a cam 17b on a catcher 17 at the branch point in a figure (a) and is guided, and a base shaft 25 is moved in a guide groove formed with guide plates 41 and 45b. In a figure (b), the guide base 9 reaches the branch point and a pin 34 and a cam 42 on a guide plate 15b are brought into contact with each other and a pin 33 on the base 9 is entered in and guided by a branch groove 17a formed with the catcher 17. In a figure (c), a base shaft 36 on the base 9 is guided by the same guide groove as the base 6. Further, bases 6 and 9 are brought into contact with catchers 16 and 17 by the press-fixing force generated by a press-fixing force generating mechanism and are positioned as shown in a figure (d).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device such as a VTR, and particularly to a tape guide guide mechanism suitable for reducing the size and weight of the device.

[Conventional technology]

Magnetic recording and reproducing devices are generally provided with a so-called loading mechanism that draws out a tape stored in a cassette and winds it around a cylinder, simultaneously forming a tape path, and conversely storing the tape in the cassette. Among these loading mechanisms, as in the device described in Japanese Patent Application Laid-open No. 58-218066, a plurality of tape guides that rotate in the same direction relative to the cylinder each follow the same path halfway to the final positioning position. There are some routes that branch off along the way and guide you to different travel routes. As a method for branching the tape guide of this type of loading mechanism, for example, as in the device described in the above-mentioned publication, a bin integrated with the tape guide is attached to a cam installed on a guide plate dedicated to branching provided on the mechanical board. How to hook and guide
There is a method of branching by biasing the tape guide in the branching direction with a torsion spring, as in the device described in Japanese Patent No. 48.

[Problem that the invention seeks to solve]

In the above conventional technology, as a method of branching the tape guide in a direction away from the cylinder, it is necessary to arrange a guide plate dedicated to the tape guide branching along the branching direction, and furthermore, a pin of the tape guide to be hooked to the guide plate. must be provided outside the guide plate, which increases the widthwise size of the mechanism and the number of parts.

Furthermore, if a spring is used to bias the tape guide away from the cylinder, the spring presses the tape guide against the guide plate, resulting in an increase in the load on the guide guide mechanism, or The branching operation may become uncertain due to impact, etc.

SUMMARY OF THE INVENTION In view of the problems of the prior art described above, an object of the present invention is to provide a loading mechanism that achieves miniaturization of the device and reliable branching of the tape guide.

[Means for solving problems]

The purpose of the above is to separate the tape guide that rotates around the cylinder (hereinafter referred to as the first guide) and the tape guide that moves away from the cylinder (hereinafter referred to as the second tape guide) as a branching method. This is achieved by providing cams on which each tape guide abuts on the guide plate that is not to be moved and guides it to the guide plate that is to be moved.

[Effect]

The first tape guide comes into contact with a cam provided on a guide plate (hereinafter referred to as a second guide plate) on which the second tape guide is to be moved, and the second tape guide does not enter the cam. The second tape guide comes into contact with a cam provided on the guide plate (hereinafter referred to as the first guide plate) on which the first tape guide is to move, and does not enter the first guide plate. Further, each tape guide does not come into contact with the cam on the guide plate to be moved. Thereby, each tape guide does not enter the other guide plate.
You will be guided to a predetermined guide plate.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a plan view of the magnetic recording/reproducing apparatus to show the tape loading operation. In the unloading state, a tape 4' is wound around the supply reel 2 and take-up reel 3 housed in the cassette 1 as shown by the broken line. The front opening of the cassette 1 includes an entrance drawer guide 5', a guide roller 7' set up on a guide base 6', and an inclined bin 8'.
, a guide roller 10' that is set up on the guide base 9', an exit side pull-out roller 11', and a pinch roller 12' are housed as indicated by broken lines. When a loading command is issued, the rotational driving force of the loading motor 13 is transmitted to the loading ring 14, and a guide base 6 (described later) connected to the loading ring 14,
'9' is guided by guide plates 15a and 15b as shown by arrows in the figure, and positioned by catchers 16 and 17.

Similarly, the exit side drawer guide 11' and the pinch roller 12' are
It is driven along the arrow in the figure by a transmission mechanism (not shown) that transmits the rotational driving force of the loading motor 13.

The tape 4' is pulled out by the above-mentioned loading operation,
Supply reel 2. Entry side drawer guide 5, tension pin 18
, guide roller 10, inclined bins 19, 8, guide roller 7, cylinder 20. Guide roller 21. pinch roller 1
2. Capstan 22. A tape path is formed to attach the output side pull-out roller 11 and the take-up reel 3. In the recording/reproducing mode, the drawn-out tape is held between the capstan 22 and the pinch roller 12 and driven, and is wound up by the take-up reel 3 which is rotationally driven by the reel motor 23. Magnetic signals are exchanged on the tape 4 by a rotating magnetic head (not shown) built into the cylinder 20. Next, in the loading mechanism for pulling out the tape as in this embodiment, like the guide base 6.9, it is guided by a common moving path until the middle of loading in order to effectively utilize the mechanical plane area, and each part has its own dedicated There is a configuration in which the route is branched into two travel routes. A mechanism for branching the guides necessary in such a configuration will be described below.

FIG. 2 is a perspective view showing the guide base 6 that rotates approximately concentrically with respect to the cylinder 20 and its drive mechanism. The guide base 6 includes a guide roller 7 and a compression spring 24.
The base shaft 25 into which the shaft 43 inserted is press-fitted is press-fitted. Further, the base shaft 28 press-fitted into the guide base 6 is rotatably inserted between the spring presser 26 and the connecting plate 27 (the connecting plate 27 can also be slid) and locked with an E-ring (not shown).

The connecting plate 27 and the spring presser 26 have a section 27a into which a compression spring 29 for pressing the guide base 6 can be inserted.

26a is provided, and during crimping, the connecting plate 27 and the spring presser 26 slide against the guide base 6 and compress the compression spring 29, thereby obtaining the crimping force of the guide base 6. The connecting plate 27 is rotatably inserted into a pin 30 set on the loading ring 14, and is connected to the polyslider 3.
It is locked by 1. The guide base 6 is connected to the loading ring 14 as described above, and the base shaft 2
5.degree. 28 is guided by a guide groove formed by the guide plates 15a and 16b, and the guide plates 15a and 15b are held between the upper and lower sides by the projections 6a and 6b of the guide base 6.

FIG. 3 is a perspective view showing the guide base 9 that branches and moves away from the cylinder 20 during loading and its drive mechanism. A base shaft 32 into which a shaft 44, into which the guide roller 10 and compression spring 31 are inserted, is press-fitted, pins 33, 34, and a base shaft 36 are press-fitted into the guide base 9.

The base shaft 36 is locked with a ring through which the connecting plate 35 is rotatably inserted. The connecting plate 35 and the spring retainer 37 have a section 3 into which a compression spring 38 for crimping the guide base 9 can be inserted.
5a and 37a are provided respectively, and during crimping, the connecting plate 35 and the spring retainer 37 slide against the guide base 9 and compress the compression spring 38, thereby obtaining the crimping force of the guide base 9. The connecting plate 35 and the spring retainer 37 are rotatably inserted into a pin 39 set on the loading ring 14 (the connecting plate 35 can also be slid), and are locked by a polyslider 40. As described above, the guide base 9 is connected to the loading ring 14, and the base shaft 36 and pin 33 are guided by the guide groove formed by the guide plates 15a and 15b, and the protrusion 9a of the guide base 9
, 9b and the connecting plate 35 are held by vertically sandwiching the guide plates 15a and 15b.

Next, the branching operation of the tape guide will be explained with reference to FIG.

The guide base 6.9 is guided and moved around the cylinder while pulling out the tape from the cassette storage state. At the branch point in FIG. 4(a), the guide base 6 is
The upper left end surface 6c of the base shaft 2 is guided by contacting the cam 17b on the catcher 17, and the base shaft 2 is set up on the guide base 6.
5 (FIG. 2) is the branch groove 17a formed by the catcher 17.
The guide grooves formed by the guide plates 41 and 15b are moved without entering the guide plate 41, 15b. The right end surface of the cam 17b and the left end surface 6c of the guide base 6 have a radius of curvature such that the guide base 6 is guided around the cylinder. In FIG. 4(b), when the guide base 9 reaches the branch point, the pin 34 on the guide base 9 and the cam 42 on the guide plate 15b come into contact, and the guide base 9 is guided in the direction away from the cylinder 20. Pin 33 on guide base 9 is catcher 1
It enters the branch groove 17a formed by 7 and is guided. Since the cam 42 is formed in a U-shape on the guide plate 15a,
It does not come into contact with the guide base 6. At the time of FIG. 4(c), the diameter of the base shaft 36 set on the guide base 9 is set larger than the width of the branch groove 17a, so it is not guided to the branch groove 17a, and the base shaft 36 is not guided to the guide base 6. They are guided to the same guide groove. As shown in FIG. 4(d), the guide base 6.9 has a catcher 16° 17 and a
They are brought into contact and positioned using the pressure generated by the pressure generation mechanism shown in FIG.

FIG. 5 shows another embodiment, in which the guide base 9 is provided with branching pins 34a and 34b. These two pins, like the pin 34 in FIG. 4, come into contact with the cam 42 and are provided so as to guide the pins 33 and 36 to the branch groove 17a, respectively.

In this way, a configuration may be adopted in which the posture and movement path of the guide base are set by using a plurality of pins that are branched according to the necessity of the loading operation, and a plurality of branching pins that are pushed out correspondingly.

Further, according to the example shown in FIG. 4, since there is no need to provide a branching member on the branch point, the guide base can be moved also on the branch point, and the mechanical planar area can be used effectively.

〔Effect of the invention〕

According to the present invention, there are the following effects.

(1) Since the components necessary for branching can be integrally molded with the tape guide and the guide plate, the number of parts can be significantly reduced.

(2) A guide plate for branching and guiding separate from the guide plate for guiding the guide base, which was required in the past, is no longer required.
The guide base and guide plate are not arranged in a direction that increases the width of the mechanism more than necessary, and the mechanism can be made smaller.

(3) Cost reduction can be achieved by the above (1) and (2).

(4) There is no need to load while pressing the guide plate, and the driving load during loading can be reduced.

(5) The guide base does not wobble at the branching point due to vibrations or shocks, resulting in highly accurate branching operation, and the reliability of the mechanism can be improved.

[Brief explanation of drawings]

FIG. 1 is a top view showing the loading operation of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are perspective views of a guide base that performs the loading operation, and FIGS.
FIG. 5 is a top view showing the loading operation at each branch point. 1... Cassette, 2... Supply reel, 3... Take-up reel, 4... Tape, 6, 9... Guide base,
7゜10... Guide roller, 8... Inclined pin, 15
, 17° 41... Guide plate, 34... Pin, 42...
··cam.

Claims (1)

[Claims] 1. In a tape guide guide mechanism of a magnetic recording/reproducing device, a first guide (6) that moves along the circumference of a rotating cylinder (20), and a first guide (6) that moves along the circumference of the rotating cylinder (20), and a first guide (6) that moves along the circumference of the rotating cylinder (20), and A second guide (9) that moves in a direction away from the rotating cylinder (20), and a common guide member (15a,
15b), a first guide member (41, 15b) that guides only the first guide (6), and a first guide member (41, 15b) that guides only the first guide (6);
9), and a second guide member (17a) for guiding the first and second guides, and a second guide member (17a) for guiding the first and second guides.
On the first guide member (41, 15b), the second guide (9) is rotated by not contacting the first guide (6) but contacting the second guide (9). Cylinder (20)
A cam (42) is provided for guiding in a direction away from the second guide (9) on the second guide member (17a).
without contacting with the first guide (6) and contacting with the first guide (6).
A tape guide guide mechanism characterized in that a cam (17b) is provided for guiding the guide (6) in the direction in which it should move along the periphery of the rotating cylinder (20).