JPH0441424B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape loading device used in a cassette video tape recorder.

2. Description of the Related Art Conventionally, a tape of a cassette-type video tape recorder is used in which a magnetic tape is pulled out from a tape cassette and attached to the outer periphery of a rotating head cylinder disposed near the tape cassette to record or reproduce video signals. In the loading device, when the tape cassette held by the cassette holder is set in a predetermined position, the tape cassette shown in FIG.
As shown in FIG. 2, the tape pull-out pin 3 is inserted through the opening 2 of the tape cassette 1 and positioned inside the magnetic tape 4. Generally, the magnetic tape in the tape cassette 1 is pulled out of the tape cassette by moving the tape pull-out pin 3 in the direction of arrow a.
Note that 5 in FIG. 4 is a pin (also called a post) that guides the running of the magnetic tape when the magnetic tape is pulled out and attached to the outer periphery of the rotating head cylinder, and this is a pin (also called a post) that an identical support member 6 to move with 3;
installed on.

Problems to be Solved by the Invention However, in conventional tape loading devices, for example, when the tape cassette is used in a horizontal position, there are not many problems;
When the short side of the tape cassette is used vertically or almost vertically, the support member 6 including the tape pull-out pin 3 and pin 5 may be displaced in the direction of arrow a due to its own weight. See Figure B].
Therefore, when the tape cassette 1 is moved in this state for recording or playback in the direction in which the tape pull-out pin 3 is inserted, that is, in the direction perpendicular to the plane of the drawing, the magnetic tape 4 is moved by the tape pull-out pin 3.
There was a problem of damage caused by contact with the

This problem is caused by the fact that it is mechanically extremely difficult to prevent the support member 6 from being unnecessarily displaced due to its own weight, that is, the mechanism inevitably causes "backlash". However, this problem becomes more noticeable when it is unavoidable to place the tape pull-out pin 3 close to the inner surface of the magnetic tape 4 in order to downsize the video tape recorder.

In view of the above-mentioned problems, the present invention provides a tape loading device that prevents unnecessary displacement (positional shift) due to its own weight when the tape withdrawing means is in a non-extracting position as illustrated in FIG. 4A. This is what I am trying to do.

Means for Solving the Problems In order to solve the above problems, the tape loading device of the present invention pulls out a magnetic tape from a tape cassette and loads it onto the outer periphery of a rotating head cylinder disposed near the tape cassette. tape pulling means movable between a non-drawing position located inside the magnetic tape in the tape cassette and a drawing position located near the rotating head cylinder; a drive means for driving along a guide groove provided near the rotary head cylinder so as to move the tape between drawer positions, and a holding member for holding the tape drawer by elastic force in the non-drawer position. It is equipped with the means.

Effects The present invention, with the above-described configuration, can prevent unnecessary displacement and rattling of the tape drawer at the non-drawer position, and thereby, even when the tape cassette is loaded vertically, the magnetic tape without damaging it.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a top view of a main part of an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the main part. In those drawings, reference numeral 10 indicates openings 11a and 11b through which a magnetic tape (not shown) can be drawn out;
A tape cassette has a take-up tape reel 12a and a supply tape reel 12b, and 13 is a rotating head cylinder disposed near the tape cassette 10, which has a magnetic tape wound around its outer periphery within a range of 270 degrees. , in order to record video signals obliquely, it is mounted obliquely with respect to a base (not shown) parallel to the plane of the paper. Reference numerals 14a and 14b are first and second drive rings rotatably held around the rotary head cylinder 13 by guide mechanisms (not shown). Here, the first drive ring 14a is the second drive ring 14.
Connecting portions 15a and 15b are located below b and are integrally formed on the outer periphery of each, and
Teeth are formed over a predetermined range on the outer periphery of each. In this example, the teeth are formed approximately on the left half of the lower first drive ring 14a, and the teeth are formed approximately on the right half of the upper second drive ring 14b. 16a is a first drive gear that meshes with the teeth of the first drive ring 14a, which is connected to a drive source (not shown).
is rotated at the required time by 16a is the second
This is a second drive gear that meshes with the teeth of the drive ring 14b, which meshes with an intermediate gear 16c that is integrally formed with the first drive gear 16a. Therefore, for example, when the first drive gear 16a rotates clockwise, the second drive gear 16b rotates counterclockwise, and along with this, the first drive ring 14a rotates counterclockwise and , the second drive ring 14b will rotate clockwise.

That is, this case is the time of tape loading. Here, the first drive ring 14a and the first drive gear 16a serve as the first drive means, and the second drive ring 14b and the second drive gear 1 serve as the first drive means.
6b constitutes a second driving means.

A connecting lever 17 has one end rotatably connected to the connecting portion 15a of the first driving ring 14a constituting the first driving means, and a headed pin-like body 18 implanted in the other end. It is. The headed pin-shaped body 1
8, as shown in FIG. 2, is loosely fitted into a guide groove 20 of the base body 19 provided near the right outer periphery of the rotary head cylinder 13, so that it can move along the guide groove 20. In this case, the outer diameter of the head of the headed pin-like body 18 is made larger than the width of the guide groove 20, so that the headed pin-like body 18 will not come out of the guide groove 20 unnecessarily. do not have.

Note that the rear end edge of the guide groove 20 is provided with the base body 1.
A positioning portion 21 which also serves as a stopper is provided by bending a portion of 9 upward. 22 is provided separately from the headed pin-like body 18, and includes a stepped recess 23 at the rear end into which the headed pin-like body 18 can be inserted, and a stepped recess 23 located at the front and back with respect to the magnetic tape pull-out direction. First and second posts 24, 25 planted in parallel or nearly parallel
It is a movable base having a. Note that the head of the headed pin-like body 18 is fitted into the stepped portion of the recess 23 . Reference numeral 26 denotes a retaining piece having an L-shaped cross section that holds the headed pin-like body 18 inserted into the recess 23, and is screwed to the movable base body 22 with a screw 27. It's summery. Here, the headed pin-shaped body 18
The movable base body 22 including the first and second posts 24 and 25 and the retaining piece 26 constitutes a first tape drawing means 28. 29, as shown in FIG. 3, the first tape drawing means 2;
8. More precisely, the rear end of the movable base 22 to which the retaining prevention piece 26 is attached (see FIGS. 1 and 2)
(front side in the figure) is an elastic plate-like body that integrally has a tongue-like part 29a that is elastically clamped between the base 19 and a mounting part 29b that fixes the tongue-like part 29a to the base 19. It is a holding member configured. Note that this holding member 29 has screws 30 attached to the base 19.
Screw insertion holes 31 for fixing with the base body 19
A positioning hole 33 into which a positioning convex portion 32 protruding from is inserted is provided. FIG. 2 shows a state in which the holding member 29 has been removed, and the attachment position thereof is shown in chain lines instead. When actually attaching the holding member 29, the tongue-shaped portion 29
The positioning part 21 is located inside the base of the part a (the part indicated by G in FIG. 3), and the positioning hole 3
With the positioning protrusion 32 fitted into the screw 3, the screw 30 is inserted into the screw insertion hole 31 and the screw hole 34 and fixed.

35 is a movable base body having third and fourth posts 37 and 38 constituting the second tape drawing means 36; 40, it is connected to the connecting portion 15b of the second drive ring 14b via a connecting lever 41. In this embodiment, the first tape pull-out means 28 moves from a position shown by a solid line parallel to the plane of FIG. 1 (hereinafter referred to as a pull-out position) to a position shown by a chain line A (hereinafter referred to as When moving from the position shown by the solid line in FIG. 1, that is, the non-drawing position, to the position shown by the chain line B, that is, the drawn position, the second tape drawing means 36 gradually rises. Because of this,
The third and fourth posts 37 and 38 are attached to the movable base 35 with their respective tips being inclined greatly in the direction in which they approach each other. In the case of such a post structure, even if the third and fourth posts 37 and 38 are slightly displaced due to rattling of the mechanical part, the problem seen in the conventional example described above does not occur.
If the third post 37 must be placed close to the inside of the magnetic tape due to reasons such as the need to widen the distance between the third and fourth posts 37, 38, A holding member 29 similar to the holding member 29 attached to the first tape pulling means 28 may be attached to the second tape drawing means 36 as well.

In the above structure, the first drive gear 1
6a is rotated clockwise at the required time, and when the first drive ring 14a rotates approximately half a turn counterclockwise, the power is transferred to the connecting portion 15a and the connecting lever 1.
7. The information is transmitted to the movable base 22 via the headed pin-shaped body 18, thereby causing the first tape drawing means 28
moves along the guide groove 20 from the non-extracted position shown by the solid line in FIG. 1 to the extended position shown by the chain line A.

On the other hand, the power of the first drive gear 16a is also transmitted to the second drive ring 14b via the intermediate gear 16c and the second drive gear 16b, and the second drive ring 14b rotates approximately half a turn clockwise. As a result, the power is transmitted to the connecting portion 15b, the connecting lever 41,
This is also transmitted to the movable base 35, and the second tape pulling means 36 moves along the guide groove 40 from the non-drawing position shown by the solid line in FIG. 1 to the drawing position shown by the chain line B.

By the above operation, when the tape cassette 10 is set in the position shown by the chain line in FIG. 2 posts 24, 25 and a second tape pulling means 36
It is pulled out by the third and fourth posts 37 and 38 and wrapped around the outer periphery of the rotary head cylinder 13 over a range of 270 degrees for recording or reproduction. When recording or playback is finished and a stop button (not shown) is operated, the first and second tape pull-out means 28 and 36 move from the pull-out positions indicated by chain lines A and B to the non-drawer position indicated by solid lines. Return to position. In this case, the first tape pulling means 28 has a rear end portion of its movable base 22 inserted below the tongue-shaped portion 29a of the holding member 29, and
As a result, the tongue-shaped portion 29a comes into pressure contact with the upper surface portion of the retaining prevention piece 26, and the first tape drawing means 28 is clamped between it and the base body 19 by elastic force. As a result, no matter what position the VTR body is used in, the first tape pull-out means 28 will not wobble or be displaced unnecessarily, so that even if the tape cassette 10 is attached or detached, the magnetic tape will not be attached to the first post 24. It will not be damaged by. Of course, if the second tape pull-out means 36 is also provided with something similar to the holding member 29, the magnetic tape will not be damaged by the third post 37.

Effects of the Invention As is clear from the above explanation, the tape loading device of the present invention is designed to hold the tape drawing means in its non-drawing position with elastic force, so that the tape cassette can be loaded vertically. No matter what position the VTR body is in, such as when the tape cassette is loaded, the tape ejecting means will not be unnecessarily displaced from its normal position in the non-extracted position, or will not wobble. This prevents the occurrence of a situation where the tape is damaged by the tape drawer post.

Further, since the present invention can be realized by using a holding member with a simple structure as illustrated in FIG. 3, it is possible to provide a VTR with low cost and high reliability. Furthermore, as a tape drawing means, a headed pin-like body as shown in FIG. The configuration includes a retaining prevention piece that holds the headed pin-like body in a state where it can be inserted into the recess of the movable base, and a retaining means (the retaining member of the above-mentioned embodiment) is provided on the upper surface of the retaining prevention piece. If the tongue piece-like part (equivalent to No. 29) is configured so as to come into pressure contact with each other, it not only becomes easier to assemble the tape drawing means and replace parts, but also prevents the detachment prevention piece from separating the headed pin-like member and the movable base. Since the connection part with is covered,
It has a number of features, such as smooth movement in and out of the lower position of the tongue-like part of the holding means, and a long service life if a wear-resistant material is selected for the retaining member. It is.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway top view of an embodiment of the present invention, FIG. 2 is an exploded perspective view of the essential part of FIG. 1, FIG. 3 is a perspective view of a holding member in the same embodiment, and FIG. 4 A,
B is a top view of essential parts of the conventional example. 10... Tape cassette, 13... Rotating head cylinder, 14a, 14b... Drive ring, 1
6a, 16b... Drive gear, 17, 41... Connection lever, 18... Headed pin-shaped body, 19, 39...
Base body, 20, 40... Guide groove, 22, 35... Movable base body, 23... Concave portion, 24, 25, 37, 38
... Post, 26 ... Retention prevention piece, 27 ...
Screws, 28, 36...Tape drawing means, 29...
...Holding member. 29a...tongue-shaped part, 29b...attachment part.

Claims (1)

[Claims] 1. Pull out the magnetic tape from the tape cassette,
between a non-drawn-out position located inside the magnetic tape in the tape cassette and a drawn-out position located near the rotary head cylinder so as to be attached to the outer periphery of a rotary head cylinder disposed near the tape cassette; a tape draw-out means capable of moving the tape draw-out means; and a drive means for driving the tape draw-out means along a guide groove provided in the vicinity of the rotary head cylinder so as to move the tape draw-out means between the non-draw-out position and the draw-out position. A tape loading device comprising a holding means for holding the tape drawing means in the non-drawing position with an elastic force. 2. The tape drawing means is constituted by first and second tape drawing means, and the holding means is provided only on the side of the tape drawing means that is closer to the winding side of the tape cassette. A tape loading device according to claim 1. 3. The holding means is an elastic plate-like member that integrally has a tongue-like part that holds the tape drawing means between the base body in which the guide groove is formed, and a mounting part that fixes the tongue-like part to the base body. 3. The tape loading device according to claim 1, wherein the tape loading device is constructed of a body. 4. The tape drawing means includes a headed pin-like body that moves within the guide groove in response to the power of the driving means, and is provided separately from the headed pin-like body, and has the headed pin-like body at the rear end. a movable base having a recess that allows insertion, and first and second posts that are implanted in parallel or substantially parallel so as to be located in front and back with respect to the tape pulling direction; A patent characterized in that the structure includes a retaining prevention piece that holds the head pin-shaped body in an inserted state, and a tongue-like part of the holding means is in pressure contact with the upper surface of the retaining prevention piece. A tape loading device according to claim 3.