JPS5814429Y2 - Tape recorder tape slack absorption device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tape slack absorbing device for a tape recorder, and in particular, it is designed to automatically absorb tape slack when the cassette holder finishes transitioning from the ejection position to the loading position. It is something that

For example, a dual-capstan closed-loop tape recorder, which has recently been widely used in high-end models, has a pair of capstans and a pinch roller placed in front and behind the recording and playback heads, and both pinch rollers are simultaneously connected to the respective caps. Because it is configured to run the tape in a predetermined manner by being crimped onto the stand, stable tape running is obtained that is less affected by disturbances outside the loop than with single capstan type tape recorders, and the head and tape This has the effect of keeping the contact in good condition.

However, in such a dual capstan closed-loop tape recorder, if playback is performed with tape slack in the loop, the difference in the rotational speed of the front and rear capstans causes the loop to become loose. Due to its structure, it takes a considerable amount of time to absorb tape slack. For example, in a tape recorder with a capstan diameter of 2.5φ, the rotation speed of the capstan in front of the head (on the upstream side) is 370. The rotational speed of the capstan after the head (downstream side) is 371.2 rpm, and the difference therebetween is extremely small.

), there is a risk that the tape running may be disturbed and the contact between the tape and the head may become unstable.

Therefore, in order to eliminate this drawback, in the conventional electromagnetic type, when a cassette is inserted into the main body of a tape recorder, a switch is used to detect that a cassette has been inserted, and this switch is closed. There is a system in which the supply reel stand is brought into an unwinding state while the brake of the take-up reel stand is applied for a certain period of time (several seconds) from the point at which tape slack is removed.

However, since such a system uses a plunger or the like, there are problems in terms of cost and space, and it has not been possible to use such a system with a manual mechanism.

The present invention has been developed in view of this point, and is a tape slack absorbing device for a tape recorder with an extremely simple structure that can remove tape slack in a cassette when loading the cassette without using a plunger or the like. This is what we are trying to provide.

An embodiment of the present invention will be described below with reference to the drawings.

The figures show the device of the present invention, with Figure 1 being a schematic side view and Figure 2 being a schematic side view.
The figure shows the cassette holder in the ejection position, and FIGS. 3 and 4 show different operating states when the cassette holder has finished transitioning from the ejection position to the loading position.

In the figure, 1 is a gear rotatably provided on the chassis 3 together with the supply reel stand 2, and 4 is a take-up reel stand.

Reference numeral 5 denotes a cassette holder that holds the cassette 6 indicated by the dotted line and moves the cassette 6 from the ejection position (dotted line position) to the loading position (solid line position) as shown in FIG. It is rotatably supported by a shaft I and is always urged in the direction of ejection of the cassette by a spring 8, and a locking hole 10 is provided in the leg portion 9.

Reference numeral 11 denotes a discharge lever provided with an abutment piece 12, which is pivotally supported 7 on the cabinet body together with the cassette holder 5, and is always urged by a spring 13 to a non-operating position.

14 is a bent piece 1 that comes into contact with the abutting piece 12 of the ejection lever.
5 and a locking pin 16 that engages with a locking hole 10 in the leg portion 9 when the cassette holder 5 moves to the mounting position.
, 17' and through holes is and is', and is always biased in the direction of arrow A by a spring 19.

Reference numeral 20 denotes a rotary lever having elongated holes 21 and 22 at both ends, respectively, and rotatably supported by a shaft 23 on the chassis 3. One elongated hole 21 of the rotary lever 20 is connected to the operating lever 14.
The other elongated hole 22 is fitted into a pin 24 implanted on the top, and a pin 25 implanted on a rack plate, which will be described later, is inserted into the pin 24, respectively.

Reference numeral 26 has a rack portion 21 that meshes with the gear 1 as appropriate, and an elliptical fitting hole 29 into which a fitting pin 28 implanted on a cam body (to be described later) is fitted, and an elongated hole 30 in the chassis 3 and a shaft. 31 and 47 are swingable rack plates, and the rank plate 26f has a torsion spring 32 whose one end abuts against the fitting pin 28 and the other end is locked to the rack plate 26-h. It is rotatably supported by a shaft 33.

Therefore, in the state shown in FIG. 4, the cam body, which will be described later, is pressed in the opposite direction of arrow B via the insertion pin 28 and clicked, and this reaction forces the rack plate 26 in the direction of arrow B. ing.

Reference numerals 34 and 35 denote brake levers 36 and 37 rotatably supported on the chassis 3 such that the respective crimping parts 34' and 35' face the supply/take-up reel stands 2 and 4, respectively, and are not shown in the drawings. The brake lever 34 on the supply side is
The brake lever 35 on the winding side is always energized in the counterclockwise direction, and when the stop operation is performed, both brake levers 34 and 35 are actuated to close the respective crimping portions 34' and 35'.
are configured so as to come into pressure contact with the sides of the respective reel stands 2 and 4 at approximately the same time.

38 is a cam body whose cam body 39 is formed into an elliptical shape and whose eccentric point is rotatably supported on the chassis 3;
The cam body 38 moves in one direction (
The rack plate 26 rotates in the direction of arrow C) and during the rotation, the
is guided so as to swing in the direction of engagement with or separation from the gear 1.

Therefore, the rack portion 27 of the rack plate, which is swung by the cam body 38 in the direction of engagement with the gear 1, is elastically engaged with the gear 1 by its torsion spring 32.

Further, when the rack portion 27 of the rack plate, which is swung in the meshing direction by the cam body 38, is engaged with the gear 1, the cam body 39 engages with one end of the supply side brake lever 34, and the brake lever 34 in the counterclockwise direction, and the crimping portion 34' is separated from the supply reel stand 2.
release the brake.

The device of the present invention is constructed as described above, and its operation will be explained in detail below.

First, as shown in FIG. 2, when the cassette 6 is in the ejected state, the cassette holder 5 is released from the engagement relationship between the locking pin 16 of the operating lever 14 and the engagement hole 10, and the button is pressed. As shown in FIG. 1, the cassette is held in the ejection position (dotted line position) by force.

Therefore, the operating lever 14 is at a position K (dotted line position) where it has been slid in the opposite direction of the arrow by the urging force of the spring 19 (C resistance: ~).

Therefore, the rank plate 26 is in the swing position (in the direction opposite to the arrow) in which the rack part 27 is separated from the EtAl via the [0] movable lever 20, and the fitting pin 28 of the cam body 38 is at a position slightly to the right of the shaft 40. At the same time, the cam 39 is also located at a distance from the supply side brake l/par 34, and therefore the supply side brake lever 34, together with the take-up side brake lever 35, is in pressure contact with both reel stands 2 and 4, respectively, to apply brake. .

Next, when the cassette holder 5 is moved from the ejection position to the mounting position against the biasing force of the spring 8 from such a state,
The locking hole 10 begins to move through the legs 9 of the cassette holder 5 to a position facing the locking pin 16 of the operating lever 14, and the moment the cassette holder 5 reaches the cassette mounting position, the locking pin 16 and the locking hole 10 are in a state facing each other, the operating lever 14 starts sliding in the direction of arrow A due to the urging force of the spring 19, and the locking pin 16 is also engaged with the locking hole 10. Then, the cassette holder 5 slides toward the bottom of the locking hole 10 (in the direction of arrow A), and the cassette holder 5 is locked at the mounting position.

Therefore, the rotating lever 20, which is in an interlocking relationship with the operating lever 14 through the fitting relationship between the bottle 24 and the elongated hole 21, is connected to the shaft 23.
The other bin 25 is rotated counterclockwise around the
The rack plate 26, which is interlocked with the rotary lever 20 through the fitting relationship between the rotary lever 20 and the elongated hole 22, is moved in the direction indicated by the arrow.

By the way, the cam body 38 is also rotated as the rack plate 26 moves due to the fitting relationship between the fitting pin 28 and the fitting hole 29, but when the fitting pin 28 is slightly shifted to the right from the axis 40 of the cam body 38 Therefore, the cam body 38 is rotated in the direction of arrow C, and the rack plate 26 is rotated in the direction of the arrow C.
Guide it as far as possible to swing it in the direction of engagement.

Therefore, as the gear 1, which is elastically engaged with the rack portion 27 through the torsion spring 32, is moved in the direction of the arrow p, the rank plate 26 rewinds in a deep manner and rotates in the direction. Became Seshimera.

Further, the cam body 38 moves the cam body 39 to the supply side brake when the rack portion 27 and the gear 1 maintain the meshing relationship.
The brake lever 34 is engaged with one end of the brake lever 34.
Move counterclockwise at the same time 1. The inner crimping portion 34' is spaced apart from the supply reel stand 2 to keep the reel stand 2 in a rotating state.

. The rack plate 26 is further moved from the state shown in FIG. The gear 1 is guided to swing in a direction away from the gear 1.

Therefore, when the actuation 1/bar 14 finishes sliding in the direction of the arrow (that is, when the locking pin 16 of the actuation lever reaches the bottom of the locking hole 10), the rack is closed as shown in FIG. Board 26
reaches the maximum movement position in the direction of the arrow in a state where it is completely separated from the gear 1 by the cam body 38, and the supply side brake lever 34 is released from the cam body 39 and is moved again. The crimping portion 34' is crimped onto the supply reel stand 2 to apply a brake to the supply reel stand 2.

At this time, as shown in FIG. 4, the fitting pin 28 is at a position slightly shifted to the left of the shaft 40 of the cam body 38.

Therefore, when the ejecting lever 11 is rotated from such a state (to eject the cassette 6, the actuating lever 14 slides in the opposite direction of arrow A as the ejecting lever 11 is rotated clockwise). The rack plate 26 is moved from the state shown in FIG. 4 in the opposite direction of the arrow by the clockwise rotation of the rotary lever 20.

Therefore, the cam body 38 in the state shown in FIG. 4 is rotated in the direction of arrow C as the rack plate 26 moves.
The rack plate 26 is guided so as to swing in a direction in which it does not mesh with the gear 1, and is brought into a state as shown in FIG. 2 (that is, the cassette holder 5 moves from the mounting position to the ejection position).

Therefore, the fitting pin 28 of the cam body is inserted into the cassette holder 5.
When the cassette holder 5 is in the ejection position, it is slightly to the right of the shaft 40, and when the cassette holder 5 is in the loading position, it is slightly to the left of the shaft 40.
Accordingly, as the rack plate 26 moves, the cam body 38 rotates in one direction and guides the rack plate 26 so that it can swing in the direction of engagement with or separation from the gear 1.

Therefore, when the cassette holder moves from the cassette ejection position to the cassette loading position, the end of the transition is detected and the supply reel stand is returned to its original position with the brake applied to the take-up reel stand (two directions). By slightly rotating the
It is possible to absorb tape slack that occurs between both capstans.

According to the device of the present invention, as described in Section 2, the transition of the cassette holder from the ejection position to the installation position is detected with an extremely simple configuration without using a plunger, and the movement of the cassette holder is detected before the playback operation is performed. This is so that slack in the tape within the cassette can be absorbed at the stage (ie, when the cassette is loaded into the tape recorder).

Furthermore, when absorbing tape slack, only the brake lever on the supply reel stand side is released, and when the slack absorption is completed, the brake lever is pressed against the supply reel stand again, so that the tape may not be refilled in the cassette due to external disturbances. It has the effect of eliminating the risk of loosening, and is of high practical value.

[Brief explanation of the drawing]

The figures show the device of the present invention, with Figure 1 being a schematic side view and Figure 2 being a schematic side view.
The figure shows the cassette holder in the ejection position, and FIGS. 3 and 4 show different operating states when the cassette holder has finished transitioning from the ejection position to the loading position. 1... Gear, 2... Supply reel stand, 5
...Cassette holder, 6...Cassette, 9...Leg, 10...Locking hole, 14
・・・・・・Operating lever, 16・・・Locking bottle,
20... Rotating lever 26... Rack plate, 2T... Rack part, 28... Fitting bin, 29... Fitting hole, 3B...Cam body.

Claims (1)

[Scope of utility model registration request] A gear rotatably provided on the chassis together with a supply reel stand, a cassette holder that holds the cassette and moves the cassette from a discharge position to a mounting position among three positions, and a cassette holder that controls the completion of the transition to the mounting position. an actuating means that detects and operates; a rack plate that is in an interlocking relationship with the actuating means and is swingably provided on the chassis facing the gear; and that is actuated in accordance with the swinging of the rack plate; It consists of a guide body that guides the rack plate in the meshing/separating direction with respect to the gear during operation, and the guide body is interlocked by the actuating means when the transition of the cassette holder from the ejection position to the loading position is completed. Tape loosening of a tape recorder, characterized in that the rack plate is oscillated to mesh with a gear, the gear is slightly rotated in a tape rewinding direction, and then the rack plate is guided to oscillate in a separating direction. Absorption device.