JPS6020210Y2 - magnetic tape cartridge - Google Patents

Description

[Detailed description of the invention] This invention improves the assembly work of the closing locking mechanism of the front lid for magnetic tape cartridges that have a structure in which a front lid for tape protection is attached to the front of the case body so that it can be opened and closed freely. The purpose is to

In video magnetic tape cartridges, in order to protect the magnetic tape that is led out to the outside of the front of the case body, a front cover is pivoted to the front of the case body so that it can be opened and closed, and the outside of the magnetic tape is covered when not in use. When the front cover is locked and loaded into the video deck, the cover lock is released and the front cover is opened upward, allowing the magnetic tape to be pulled out from the front of the case toward the rotating head.

As shown in FIG. 8, the conventional front cover closing/locking mechanism has a lock plate housing chamber 19 formed in the lower case 1b constituting the case body 1, and a locking claw 13 and a lock release protrusion 14. The upper end of a lock plate having a lock plate is swingably supported, and the lock plate is elastically biased toward the outer wall 20 of the storage chamber 19 by a torsion spring 12, and the lock claw 13 is attached to one of the left and right sides of the front cover 6. It engages with the inner surface of side 6a to close and lock the front M6.

On the other hand, the structure was such that the lid closing lock was released by pressing a lock release protrusion 14 extending outward from the case body 1.

However, in such a conventional lid closing/locking mechanism, the torsion spring 1
The biggest drawback was that it was cumbersome and required skill to install.

Therefore, instead of the torsion spring, something like a leaf spring or an elastic sponge body is used between the lock plate 11 and the inner back wall of the storage chamber 19.
It was proposed to be installed between 6 and 6.

However, in any case, the lock plate 11 and the spring 12
As long as these or their replacements are separate members, they must be individually installed in the storage chamber 19, which poses a problem in terms of assembly workability, which leaves room for improvement.

This invention focuses on this fact and attempts to integrate a lock plate and a spring, both of which are made of plastic, in advance so that they can be easily assembled into a lock plate storage chamber.

The details will be explained below based on the drawings.

1 and 2 illustrate a magnetic tape cartridge for video.

The case body 1 of this is a plastic upper and lower case la.
, lb are screwed together in a lid-like manner, and a pair of tape reels 3 have magnetic tape 2 wound on the left and right sides of the inside.
゜3 is rotatably attached.

The magnetic tape 2 is led out from one reel 3 to the front of the case and then wound onto the other reel 3.

A transparent leader tape is connected to both ends of this magnetic tape 2, and when the case body 1 is loaded into a video deck,
A light detection lamp 5 enters the through hole 4 in the front central part of the lower case 1b, and the light from this lamp 5 passes through the transparent leader tape and reaches the fort transistor of the start sensor and end sensor, and is connected to the tip of the tape. Detect termination.

A front cover 6 that covers the outside of the magnetic tape 2 to protect its magnetic surface is attached to the front of the case body 1 so as to be openable and closable.

The left and right sides 6a, 6a of the front cover 6 are pivotably supported on a shaft 7 in front of the left and right side walls of the upper case 1a, and a coil spring 8 attached to the shaft 7 rotates the front lid 6. The lid is biased to close, and the lid is locked via a lid closing lock mechanism, which will be described later.

When the magnetic tape cartridge is loaded into the video deck, the lid closing lock is automatically released, and the lever 9 fixed to the deck enters the vertical groove 10 on the front of the case to move the front lid 6 upward against the coil spring 8. open to

The magnetic tape 2 is now in a standby state in which it can be pulled out from the front of the case toward the rotating head of the deck.

In FIGS. 3 to 6, the closing and locking mechanism of the front lid 6 is constructed mainly of a lock plate 11 and a plate spring 12 that are integrally molded from plastic.

The lock plate 11 is formed of acetal resin or the like to be relatively thick, and has lock claws 13 and unlocking protrusions 14 integrally protruding from the front and back of its outward surface 11a, and its inward surface 11b. A thin plate spring 12 is formed into a U-shape and integrally extends in a cantilevered manner from the lower end, and a pivot shaft 15.15 is connected to the front and back of the upper end, and the light detecting lamp 5 is provided on the upper side. A through hole 17 is provided through which light passes through the sensor 16.

This lock plate 11 with spring 12 is assembled into a lock plate storage chamber 19 formed by utilizing a dead space at the front left corner of the lower case 1b.

The front left wall of the lower case 1b is recessed inward, and serves as an outer wall 20 of the storage chamber 19.
In this case, a hole 21 is opened in the upper part to correspond to the through hole 17 of the lock plate 11, and holes 22.2 are opened in the lower part to correspond to the lock pawl 13 and the unlocking protrusion 14.
3 are each open.

Furthermore, pivot grooves 25, 25 are formed in the upper edges of the front and rear side walls 24, 24 of the storage chamber 19.

In such a case, when the lock plate 11 is inserted from above along the outer wall 20 of the storage chamber 19, its pivot shaft 15,
15 are supported by the pivot grooves 25, 25, respectively.

At this time, as the lock plate 11 is inserted, the spring 12 connected to the opposite surface 11b of the lock plate 11 is simultaneously inserted into the storage chamber 1.
9 and is pushed in while being elastically deformed, and its extending end 12a comes into elastic contact with the inner back wall 26.

The elastic restoring force of the spring 12 elastically biases the lock plate 11 to the outward locking position, and the lock claw 13 and lock release protrusion 14 are inserted and protruded into the respective corresponding holes 22 and 23 of the outer wall 20, Of these, the lock claw 13 is attached to the left side 6 of the front cover 6.
The front M6 is locked in the closed lid position by being engaged with a lock hole 27 recessed in the inner surface of a.

The lock release protrusion 14 is made to protrude to the outside of the case body 1, and when the video deck is loaded, the operating tool 29 (
By pressing the protrusion 14 inward with the spring 1 (see FIG. 2), the lock plate 11 whose upper end is the pivot point
2 to the inward lock release position, thereby causing the lock claw 13 to disengage from the lock hole 27, so that the closing lock of the front cover 6 can be released here.

In addition, in the above embodiment, the lock plate 11 and the spring 1
2 are integrally molded in plastic, but these members 11 and 12 are molded in plastic separately as shown in FIG. In addition, a dovetail groove 33 may be formed at the base end of the spring 12, and the spring 12 may be dovetailed in an inverted U-shape and cantilevered to the inward surface 11b of the lock plate 11. .

In addition, when the lock plate 11 and the spring 12 are separated, there are various possible ways to connect the two, such as screw fixing, ultrasonic welding, etc.

According to the present invention as described above, the plastic spring 12 is integrated with the plastic lock plate 11 in advance before assembly.

Furthermore, this spring 12 extends upward from the lower end of the inward surface 11b of the lock plate 11.

Therefore, if the lock plate 11 with the spring 12 is dropped into the lock plate storage chamber 19 from above and inserted, the spring 12 in the free state will be attached to the inner wall 26 of the storage chamber 19.
The locking plate 11 is pushed in while being elastically deformed, and its extending end 12a comes into elastic contact with the inner back wall 26 to automatically bias the locking plate 11 to the outward locking position.

In other words, since it is not necessary to elastically deform the spring 12 in advance when inserting the lock plate 11 into the storage chamber 19, the structure can be simplified, the assembly work efficiency can be improved, and an automatic assembly machine can be used. It is extremely advantageous.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a magnetic tape cartridge to which the present invention is directed, and FIG. 2 is a partially cutaway plan view thereof. FIG. 3 is an exploded perspective view showing the front lid closing lock mechanism, which is one of the components of the present invention, and FIG. 4 is a cross-sectional plan view thereof.
FIG. 5 is a longitudinal sectional front view thereof. FIG. 6 is a perspective view of a lock plate, which is one of the constituent members of the present invention. FIG. 7 is an exploded perspective view of a lock plate and a spring showing another embodiment of the present invention. FIG. 8 is a perspective view showing a conventional front lid closing lock mechanism. 1...Case body, 1a...Upper case, 1b...Lower case, 2...Magnetic tape, 3...Tape reel, 6... Front cover, 6a... Left and right sides of the front cover, 11...
Middle lock plate, 11a...outward surface of lock plate, 11b...inward surface of lock plate, 12...spring, 12a...spring Extended end, 13... Middle claw, 14... Lock release protrusion, 15... Pivot shaft, 19...
... Tatsuku plate storage chamber, 20 ... Outer wall of the storage chamber, 22 ... Hole for locking claw, 23 ...
... Hole for the tab release protrusion, 25 ... Pivot groove, 26 ... Inner back wall of the storage chamber.

Claims (1)

[Scope of utility model registration request] It has a front lid 6 that can be opened and closed freely on the outside of the front side of the case body 1 consisting of the upper and lower cases 1a and 1b, and the front lid 6 rotates its left and right sides 6a and 6a in front of the left and right side walls of the case body 1. The lower case 1b has a lock plate housing chamber 19 at the front corner thereof, and the lock plate housing chamber 19 has a locking claw 13 and a lock release protrusion 14 integrally projected on the outward facing surface 11a. The installed plastic lock plate 11
A plastic spring 12 is fixedly extended upward from the lower end of the inward surface 11b of the lock plate 11, and the extending end 12a of the spring 12 is connected to the housing chamber 19. The lock plate is elastically contacted with the inner back wall 26 to force the lock plate outward to the lock position, and the lock claw 13 of the lock plate 11 is inserted into the holes 22 and 23 formed through the outer wall 20 of the storage chamber 19 for unlocking. The lock claws 13 are engaged with the inner surfaces of the right and left sides 6a of the front cover 6 to lock the front M6 closed, and the lock release protrusions 14 are inserted into the case body. 1 and press the lock release protrusion 14 inward from the outside of the case body 1 to move the lock plate 11 inward against the spring 12 to the unlock position. A magnetic tape cartridge configured to release the closing lock of a front cover 6 by a claw 13.