JPH0430685Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention is a tape recorder that uses a cassette (cartridge) containing a tape to perform recording and playback.
Specifically, a cassette lid is pivotally attached to a chassis equipped with a tape transport so that it can swing open and close, and the cassette lid is moved to a closed position against the biasing force of a spring that biases the cassette lid in the swinging open direction. A closing mechanism for locking and holding and a lid opening operating tool for releasing the locking of the closing mechanism are provided on one side of the chassis, and a detection device is provided at least at a position near the other side of the chassis that can be freely inserted into and removed from the tape cassette groove. This invention relates to a cassette lid opening/closing mechanism in a cassette tape recorder equipped with a lever.

<Prior Art> In this type of tape recorder, the tip of the detection lever inserted into the tape cassette groove during recording or playback is pulled out from the tape groove when the cassette lid is swung open. Furthermore, when the cassette lid is closed, it is necessary to insert and remove the detection lever from the tape cassette groove in synchronization with the opening/closing operation of the cassette lid, as described above when inserting the tape into the tape cassette groove. The following mechanism was used as a mechanism.

That is, in a model that has a recording head and a playback head, the detection levers are provided at positions close to both sides of the chassis, and in a model that has only a playback head, the detection lever is located near the lid closing mechanism. and one lid opening operating tool (both collectively referred to as the eject mechanism, hereinafter also referred to as the eject mechanism) is provided at a position near the side of the chassis opposite to the side where the eject mechanism is located, but any of these types Also, as a means for synchronizing the insertion/extraction operation of a detection lever provided in a position near the side of the chassis opposite to the side where the eject mechanism is located with respect to the tape cassette groove with the opening/closing operation of the cassette lid,
As shown in FIG. 4, the metal fittings 09 are approximately U-shaped in plan view and extend over the front and left and right sides of the chassis 01.
is provided so that it can freely swing up and down with its left and right free ends pivoted to the chassis 01, and is attached to one side of the swingable metal fitting 09 in the swinging opening direction via a spring 03. A locking protrusion 0 holds the biased cassette lid 02 in a closed position against the biasing force.
4A and a hook 04B, and the locking protrusion 04A and the hook 04 of this closing mechanism 04.
The above-mentioned eject mechanism consisting of the lid-opening operation tool 05 for releasing the lock from the lid opening operation tool 05 is provided so as to be integrally swingable, and the front side plate part of the above-mentioned swingable metal fitting 09 corresponds to the installation position of the above-mentioned detection lever 06. At the location, the metal fitting 0 accompanying the lid opening operation of the lid opening operating tool 05 is provided.
9; a cam surface 0 that slides into contact with a protruding cam follower 06a formed at the free end of the detection lever 06 to automatically and reversibly move the detection lever 06 out of the tape cassette groove;
9a was used.

<Problems to be solved by the invention> However, in the conventional mechanism having the above-mentioned configuration, a large metal fitting 09 that is approximately U-shaped in plan view is required. Not only does it require a large amount of space, which is not practical for a mechanism in a tape recorder that tends to be more compact, but the opening operation itself is also heavy as it is necessary to push and move relatively heavy metal fittings together. It is difficult to open the soft touch lid. In particular, the distance (span) between the swinging fulcrums of the metal fitting 09 is large, and since the swinging operation force is applied to one end of the metal fitting with such a large span, it is likely that the metal fitting 09 will be twisted easily. In order to prevent deformation due to twisting, it is necessary to construct the metal fitting 09 to be strong and heavy, which has the disadvantage that it becomes increasingly disadvantageous in terms of operation.

<Means for solving the problems> In view of the above-mentioned circumstances, the present invention provides a cassette lid opening/closing mechanism for a cassette-type tape recorder that has excellent effects in terms of both space factor and operability through simple structural improvements. There is a purpose in what you offer.

In order to achieve the above object, the cassette lid opening/closing mechanism in the cassette type tape recorder according to the present invention is provided on the side of the chassis opposite to the side where the closing lid mechanism and the lid opening operating tool are located in the opening and closing mechanism. A further feature of the present invention is that an interlocking mechanism is provided for automatically and reversibly moving the detection lever out of the tape cassette groove in conjunction with the swinging opening movement of the cassette lid.

<Operation> When using the cassette lid opening/closing mechanism according to the present invention having such a characteristic configuration, the cassette lid opening/closing mechanism of the present invention is operated by operating the opening operation tool in the eject mechanism to release the locking and holding of the cassette lid closed position by the closing mechanism. The cassette lid is automatically swung open via a spring biasing force, and the detection lever is automatically and reversibly moved out of the tape cassette groove in conjunction with the automatic swiveling opening movement of the cassette lid. Therefore, there is no need for an interlocking structure between the lid opening operation tool and the detection lever, and the lid opening operation tool has a mechanism for moving the detection lever out of the tape cassette groove. No operating force is required.

<Examples> Examples of the present invention will be described below in detail based on the drawings.

In Figures 1 to 3, reference numeral 1 indicates basic operating mechanisms such as a tape constant speed running mechanism, tape fast forwarding mechanism, rewinding mechanism, and stop mechanism, as well as additional operation mechanisms such as automatic stop, temporary stop, and automatic repeat. 2 is a chassis having a rectangular shape in plan view and equipped with a tape transport, and 2 is a cassette lid located at the upper part of the chassis 1 and pivoted to the rear end of the chassis 1 so as to be able to swing open and close around the horizontal axis. Tape cassette insertion/extraction guides 2A, 2A are formed on the lower surface thereof, and are biased in the swinging opening direction via a helical spring 3 fitted and secured to the chassis 1. Reference numeral 4 denotes a closing mechanism for locking and holding the cassette lid 2 in the closed position against the biasing force of the spring 3. It consists of a hook 4B pivotably supported on one side of the chassis 1 so that it can be freely engaged and detached from the chassis.
The hook 4B is always connected via the spring 10.
The locking projection 4A is biased to swing in the engaging direction, and when the cassette lid 2 in the open position is swung closed, the spring 1 is pushed by the locking projection 4A.
0 and escapes in the withdrawal direction, and then automatically returns to the state of engagement with the locking protrusion 4A. 5 is for automatically swinging and opening the cassette lid 2 by the biasing force of the spring 3 by swinging the hook 4B in the lid closing mechanism 4 in the unlocking direction against the spring 10. The lid-opening operation tool, that is, the eject button, is formed integrally with the hook 4B by sheet metal processing, and these lid-closing mechanisms 4
A lid opening operating tool 5 is provided on one side of the chassis 1. Reference numerals 6 and 6' denote detection levers pivotably supported at the front end position of the chassis 1 near both left and right sides of the chassis 1, and these detection levers 6 and 6' are connected to switches SW and 6' that operate in response to the detection levers.
The tips 6b, 6b' of SW' are biased to swing in the direction of insertion into the tape cassette groove via a non-operating biasing spring (not shown).

Of the two detection levers 6, 6', the detection lever 6' on the side where the eject mechanisms 4, 5 are located
The detection lever is arranged so that its tip 6b' moves into and out of the tape cassette groove in conjunction with the movement of the metal fitting 8, which is integrally machined with the hook 4B and the lid opening operating tool 5. A protruding cam follower 6a' is formed on the free end of the chassis 1, and a cam surface 8a is formed on the metal fitting 8 to be in sliding contact therewith.The other side of the chassis 1 on the side where the other detection lever 6 is located , an interlocking mechanism 7 is provided which swings the detection lever 6 in a direction in which the tip end 6b of the detection lever 6 automatically and reversibly comes out of the tape cassette groove in conjunction with the swinging opening movement of the cassette lid 2. There is. As clearly shown in FIG. 2, this interlocking mechanism 7 has one end cam surface 7a connected to the detection lever 6.
A lever-shaped metal fitting 7A is swingably supported on the chassis 1 in a state of abutting engagement with the cam follower 6a at the free end, and a switch responsive to the detection lever 6.
The spring 7B has a spring pressure stronger than the non-operating spring pressure of SW, and swings and biases the lever-shaped fitting 7A in the direction in which the detection lever 6 comes out of the tape cassette groove. A metal fitting 7 that restricts the swinging of the lever-shaped metal fitting 7A against the swinging biasing force of the spring 7B by coming into contact with a protrusion 2B connected to the side surface of the cassette lid 2.
A and a claw-like protrusion 7C integrally connected thereto.

In the cassette lid opening/closing mechanism having the above structure, the second
When the lid opening operation tool 5 is pressed in the closed lid position shown in the figure to release the hook 4B from the locking protrusion 4A, the cassette lid 2 swings in the direction of the arrow X in FIG. 2 due to the biasing force of the spring 3. Open. Due to this swinging and opening movement of the cassette lid 2, the protruding piece 2B is separated from the claw-like protrusion 7C, so that the lever-shaped metal fitting 7A swings in the direction of the arrow Y by the biasing force of the spring 7B. Due to the swinging, the detection lever 6 swings in the direction of arrow Z via the cam surface 7a and the cam follower 6a, and its tip 6b automatically comes out of the tape cassette groove, thereby opening the cassette lid 2. The opening can be smoothly swung to the desired position.

In this case, the tip end 6b' of the other detection lever 6' comes out of the tape cassette groove via the cam surface 8a of the metal fitting 8 that moves integrally with the lid opening operating tool 5 and the cam follower 6a'.

Furthermore, it is a matter of course that an appropriate gap is formed between the tip of the detection lever 6 and the tape cassette groove so that the cassette groove 2 and the detection lever 6 do not get caught in their swinging movements. .

Further, in the above embodiment, the recording head and the playback head are installed, and the detection levers 6 and 6' are installed on the left and right sides, respectively. It may also be applied to a device in which one detection lever 6 is provided only on the side opposite to the side where the detection lever 6 is located, and in this case, the above-mentioned metal fitting 8 is unnecessary.

Note that the detection lever in the present invention may be used for any detection such as prevention of forward erroneous recording, metal tape detection, high position detection, and prevention of reverse erroneous recording.

<Effects of the invention> As is already clear from the above detailed description, when the present invention is used, the tape groove of the detection lever 6 provided at a position near one side of the chassis 1 opposite to the side where the eject mechanism is located. The ejecting operation is not performed directly in conjunction with the operation of the lid opening operation tool 5 in the eject mechanism, but in conjunction with the swinging opening movement of the cassette lid 2 due to the spring biasing force, and is performed on the side where the eject mechanism is located. is the chassis 1 on the opposite side.
Since this is done via the interlocking mechanism 7 provided on one side, not only can the lid be opened easily and smoothly with a light and small force, but the interlocking mechanism 7 is similar to the conventional example described above in plan view. It is smaller and lighter than a square-shaped metal fitting, and therefore the entire mechanism occupies less space, making it extremely useful as a mechanism for small tape recorders, and the lid opens smoothly. We were able to do this.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, Figure 1 is an overall perspective view with some parts omitted, Figures 2 and 3 are left and right enlarged side views, and Figure 4 is a conventional example. It is a perspective view with a part omitted. 1 is a chassis, 2 is a cassette lid, 3 is a spring, 4 is a lid closing mechanism, 5 is a lid opening operating tool, 6 and 6' are detection levers, 7 is an interlocking mechanism, and 8 is an interlocking metal fitting.

Claims (1)

[Scope of utility model registration request] A cassette lid 2 is pivotally attached to a chassis 1 equipped with a tape transport so that it can swing open and close, and the cassette lid 2 is closed against the biasing force of a spring 3 that biases the cassette lid 2 in the swinging opening direction. A closing mechanism 4 for locking and holding the lid in a posture and a lid opening operating tool 5 for releasing the locking of the closing mechanism 4 are provided on one side of the chassis 1, and a tape cassette is provided at least at a position near the other side of the chassis 1. In a cassette lid opening/closing mechanism for a cassette tape recorder which is provided with a detection lever 6 that can be freely inserted into and removed from the groove, the lid opening/closing mechanism is provided with a detection lever 6 on the side opposite to the side where the closing lid mechanism 4 and the opening operating tool 5 are located. An interlocking mechanism 7 is attached to the side surface of the chassis 1, and the interlocking mechanism 7 moves the detection lever 6 automatically and reversibly to move out of the tape cassette groove in conjunction with the swinging opening movement of the cassette lid 2. 7
a lever-like metal fitting 7A pivotally supported on the chassis 1 in a state where it is engaged with the detection lever 6;
It has a spring pressure stronger than the non-operating spring pressure of the switch SW in response to the detection lever 6, and swings the lever-shaped metal fitting 7A in the direction of operation in which the detection lever 6 comes out of the tape cassette groove. It consists of a spring 7B that biases the lever 7B, and a claw-like protrusion 7C that restricts the swinging of the lever-shaped metal fitting 7A against the swinging biasing force of the spring 7B by coming into contact with the cassette lid 2 in the closed lid position. A cassette lid opening/closing mechanism in a cassette-type tape recorder.