JPH045091Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for loading a cassette into a magnetic recording/reproducing device or taking it out from a magnetic recording/reproducing device.

<Prior Art> Fig. 1 and Fig. 2 show a conventional cassette loading/unloading device. Fig. 1 is a schematic vertical cross-sectional view of a state in which a cassette is not loaded, and Fig. 2 is a schematic longitudinal sectional view of a state in which a cassette is loaded. FIG. cam gear 10
Regarding the components not shown, only the same components will be described with reference to FIGS. 5 and 6, which show an embodiment of the present invention. This cam gear 10 has a spiral cam groove 10a carved on its rear surface in the figure.
On the front side of the figure, a clutch plate 10d on which an engaging piece 10b is integrally formed is connected to a spring 10i and a felt 10.
It is attached via j to form a clutch mechanism.

One end of the holder arm 3 is rotatably held by the frame 20, and the other end is rotatably connected to the cassette holder 1 by a shaft 3b. are closely facing. In FIG. 1, the shaft 3b of the holder arm 3 comes into contact with the blocking part 16a of the blocking plate 16 having a U-shaped groove 16b, and the downward movement of the holder arm 3 is prevented.
This is a state in which the roller 3c is prevented from engaging in the spiral cam groove 10a. In addition, the clutch plate 10
An engaging piece 10b provided at d is engaged with a lock pawl 4c of a cassette detection lever 4 slidably provided on the cassette holder 1, and is prevented from rotating clockwise in the figure.

Next, the cassette (not shown) is inserted into A from the left side of the diagram.
When the cassette is inserted in the direction of the arrow until it comes into contact with the rubber roller 19, which is the means for horizontally transporting the cassette, it is detected by a detection means (not shown) and the motor 21 starts rotating. The rotational force is transmitted to the rubber roller 19 through a gear train including the cam gear 10, and the cassette is transferred in the direction of arrow A as the rubber roller 19 rotates counterclockwise in the figure. When the cassette has almost completed its horizontal movement, the cassette detects the cassette detecting piece 4 of the cassette detecting lever 4.
By contacting and pressing b, the cassette detection lever 4 is moved to the right as indicated by arrow A. When the cassette detection lever 4 is pushed to the position where the horizontal movement of the cassette is completed, a lock pawl 4c integrally formed on the cassette detection lever 4 locks the clutch plate as shown in FIG. Since the clutch plate 10d is disengaged from the engagement piece 10b, the rotation prevention of the clutch plate 10d is released, and the power of the motor 21, which continues to rotate, is transmitted through the clutch mechanism described above, and the clutch plate 10d rotates clockwise in the figure. death,
Due to this rotation, the clutch plate 1 is moved by the shaft 10c.
The connecting lever 17 connected to the blocking plate 1
6 in the direction of arrow B shown in Figure 1,
The shaft 3b of the holder arm 3 faces the blocking portion 16a of the blocking plate 16 in a sliding manner so that it can be inserted into the U-shaped groove 16b. Therefore, the holder arm 3 is
The cassette holder 1 and the cassettes held therein are rotated by their own weight and the pressing force of the rubber roller 19, and the shaft 3b enters the groove 16b and the roller 3c enters the spiral cam groove 10a. The cam gear 10 continues to rotate, and when the roller 3c is guided to the end of the cam groove 10a, the cassette holder 1 is lowered to a predetermined position, a cassette is loaded, and the motor 21 stops rotating.

<Problem to be solved by the invention> However, in the above-mentioned configuration, when the roller 3c of the holder arm 3 starts descending, an acute angle inevitably formed in the spiral cam groove 3a as shown in FIG. If the timing coincides with the time when the cam surface 10e reaches the position facing the roller 3c, the roller 3c cannot smoothly enter the cam groove 10a,
There is also a risk of malfunction or damage to the cam gear 10.

Therefore, the technical object of the present invention is to provide a cassette loading/unloading device that allows the roller to smoothly enter the cam groove and thereby reliably prevent malfunction.

<Means for Solving the Problems> In the present invention, as a technical means for achieving the above-mentioned problems, a cassette loading/unloading device is configured as follows. That is, a cassette holder 1 that holds a cassette, and a first transfer means 19 that horizontally transfers the cassette inserted for loading.
, a detection means 4 for detecting the completion of horizontal transfer by the transfer means, and a spiral shape in which the tapered body 3 rotatably connected to the cassette holder and the engaging portion 3c of the tapered body engage with each other. It has a cam gear 10 which has a cam groove 10a and is rotated from the start of horizontal transfer of the cassette to the completion of loading, and when the engaging portion engages with the cam groove, the rod-shaped body is actuated to hold the cassette holder. a second transfer means that moves to a lower loading position; and a first transfer means that prohibits the operation of the rod when the cassette is transferred in a horizontal direction to prevent the engagement portion from engaging the cam groove. a blocking means 16; a releasing means 10d which is connected to the first blocking means and receives a driving force from the cam gear via a clutch mechanism to operate the first blocking means in a direction to release the blocking thereof; A locking means 4c provided in the detection means and locking the operation of the release means until the horizontal movement of the cassette is completed; and cams 10f and 10h integrally formed with the cam gear for detecting the rotational phase of the cam groove. and a kawa follower 18a that engages with this detection cam, and a lock piece 18b that can be freely engaged and detached from a locking piece 10g that is integrally provided on the release means, and the cam follower is connected to a predetermined portion of the detection cam. a second prevention in which the locking piece engages with the locking piece only when a predetermined rotational phase of the cam groove is detected due to reaching the rotational speed of the cam groove to prevent the release means from operating the first prevention means; The device is characterized in that it includes means 18.

<Operation> The rotational phase of the cam gear is detected by the cam follower of the second blocking means that engages with the detection cam, and when the horizontal movement of the cassette is completed, the locking means provided on the detecting means is activated by the releasing means. When the lock is released, if the acute cam surface of the cam groove reaches a predetermined rotational phase in which there is a possibility that it will come into contact with an engaging part, such as a roller, the recessed part provided on the detection cam will contact the cam follower. Correspondingly, the second blocking means is actuated, and the locking piece engages with the locking piece of the releasing means to prevent the releasing means from being activated. Therefore, since the first blocking means maintains the state in which the operation of the tape-like body is inhibited, the engaging portion of the tape-like member does not engage with the helical cam groove, and the roller abuts against the acute-angled cam surface. Inconveniences such as malfunctions and damage to the cam grooves caused by this can be reliably prevented.

On the other hand, when the horizontal movement of the cassette is completed and the lock means provided in the detection means releases the lock of the release means, if the cam gear is rotating in an unspecified manner, the second blocking means is activated. Since the locking piece is not engaged with the locking piece of the release means, the release means operates the first blocking means when the locking by the locking means is released, so that the strip is released from blocking. The roller engages the cam groove, the cassette holder is moved down, and the cassette is loaded. At this time, the cam gear is in a rotational phase in which the acute cam surface does not face the roller, so no malfunction occurs.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings from FIG. 3 onwards. Figure 3 is a schematic longitudinal cross-sectional view of the cassette not loaded;
FIG. 4 is a schematic vertical sectional view of the cassette in a loaded state, FIGS. 5a and 5b are an enlarged view showing the cam gear 10 in detail and a rear view thereof, and FIG. 6 is a side view of a half section of the cam gear 10. Figures 7 and 8
Each figure is an enlarged view of the main parts, and FIG. 7 shows a state in which the clutch plate 10d is unlocked by the lock pawl 4c, but is locked by the lock lever 18, which is the main component of the present invention. , Figure 8 shows the lock lever 18.
In these figures, the same or equivalent parts as in Figs. 1 and 2 are given the same reference numerals and explanations are given. Omitted.

Since the basic operations of horizontally moving and lowering the inserted cassette are the same as those of the conventional device, the explanation thereof will be omitted, and the differences will be mainly explained next. A cam is formed on one surface of the cam gear 10, and includes a spiral cam groove 10a similar to the existing device, a concentric circular portion 10k at the outermost circumference of the cam groove, and an introduction portion 10l to the cam groove 10a. There is inevitably an acute-angled cam surface 1 at the intersection of the
0e is formed. An operating cam 10f is integrally formed on the outer peripheral portion of the other surface of the cam gear 10, and a recess 10h is formed in a suitable position in the operating cam 10f. On the other side of the cam gear 10, similarly to the existing device, a clutch plate 10d whose tip is bent in the orthogonal direction to form an engagement piece 10b is attached to the cam gear 10 by the elastic force of the spring 10i of the clutch mechanism.
The cam gear 1 is pressed by the felt 10j attached to the
Frictionally coupled to 0. This clutch plate 10d
In addition to the shaft 10c on which the connecting lever 17 is loosely fitted, a locking piece 10g, which is one of the gist of the present invention, is provided in a protruding manner.

Further, the aforementioned lock lever 18 is disposed near the cam gear 10, and this lock lever 18 is disposed near the cam gear 10.
8 is a cam follower 18 that engages with the operation cam 10f.
a and a lock piece 18b, and a spring 22.
The cam follower 18a is biased in the direction of contacting the operating cam 10f.

Next, the effect of the above-mentioned main part configuration will be explained. The recess 10h of the aforementioned operating cam 10f, the locking piece 10g of the clutch plate 10d, the cam follower 18a of the lock lever 18, and the locking piece 18.
b, the cam follower 18a of the lock lever 18 moves toward the operating cam 1 only when the cam gear 10 reaches a rotational phase in which its acute cam surface 10e may come into contact with the roller 3c as shown in FIG.
The lock piece 18b is set to enter into the recess 10h of 0f and come into contact with the locking piece 10g of the clutch plate 10d. The rotational phase of the cam gear 10 is the seventh
In cases other than the state shown in the figure, as shown in Figure 8,
The lock lever 18 rotates clockwise in the figure against the biasing force of the spring 22, and the cam follower 18 of this
a is in contact with the outer periphery of the operating cam 10f, and the locking piece 18b is spaced apart from the locus of movement of the locking piece 10g of the clutch plate 10d.

Therefore, when the cassette is inserted, the cassette detection lever 4 is pressed and moved to the position where the horizontal movement of the cassette is completed, and the cassette detection lever 4
The lock pawl 4c is the engagement piece 10 of the clutch plate 10d.
b, the clutch plate 10d is unlocked, and the clutch plate 10d is released from the cam gear 1 through the clutch mechanism.
At the point when it became possible to transmit power from 0,
When the cam gear 10 reaches a rotational phase in which the acute cam surface 10e of the cam groove 10a may come into contact with the roller 3c, the lock lever is moved in the direction in which the cam follower 18a enters the recess 10h as shown in FIG. 18 rotates, the lock piece 18b comes into contact with the locking piece 10g, and the rotation of the clutch plate 10d is prevented. Therefore, since the connecting lever 17 does not pull the blocking plate 16 and maintains the state in which the shaft 3b is in contact with the blocking portion 16a, the holder arm 3
The rotation of the roller 3c is prevented and the roller 3c does not enter the cam groove 10a. That is, the occurrence of inconvenience caused by the roller 3c coming into contact with the acute cam surface 10e is prevented.

Subsequently, as the cam gear 10 continues to rotate and passes a position where the acute cam surface 3e may come into contact with the roller 3e, the cam follower 18a rides on and slides on the outer peripheral surface of the operating cam 10f, causing the lock piece 18b to slide. Since the clutch plate 10d is released from the locking piece 10g, the unlocked clutch plate 10d rotates and the connecting lever 17 pulls the blocking plate 16 in the direction of arrow B, and the shaft 3b separates from the blocking portion 16a, as shown in FIG. As shown in the figure, the holder arm 3 is in a state where it can enter the U-shaped groove 16b, and the roller 3c is pushed inside the cam groove 10a by the weight of the cassette holder 1 and the cassette and the pressing force of the rubber roller 19, as in the existing device. The roller 3c moves along the cam groove 10a through the state shown in FIG. 8, and the cassette holder 1, that is, the cassette, is lowered to a predetermined position and loaded. To remove the cassette, the motor 21 rotates in the opposite direction to that described above, and the roller 3c moves along the cam groove 10a to move the cassette holder 1 upward, and then the cassette is removed in the reverse procedure to that described above. is taken out to the outside.

<Effects of the invention> As described above, according to the cassette loading/unloading device of the present invention, the rotational phase of the cam gear is constantly monitored,
Once the cassette has completed its horizontal phase and can be moved downward to the loading position, the cassette holder will inevitably enter the entrance of the cam groove in which it engages with the engagement part of the rod that moves the cassette holder downward. Since the second blocking means prohibits the operation of the release means for releasing the blocking state of the first blocking means only when the formed acute-angled cam surfaces are in opposing rotational phases, malfunction is ensured. Therefore, the cam groove can be prevented from being damaged due to the engaging portion coming into contact with the acute-angled cam surface.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal sectional view of a conventional device before loading a cassette. FIG. 2 is a schematic longitudinal cross-sectional view of it after loading. FIG. 3 is a schematic vertical sectional view of a cassette according to an embodiment of the present invention before loading. FIG. 4 is a schematic longitudinal cross-sectional view of it after loading. Figures 5a and 5b are front and rear views of the cam gear. FIG. 6 is a partially cutaway side view of the cam gear. FIG. 7 is an enlarged longitudinal cross-sectional view of the blocked state by the second blocking means. FIG. 8 is an enlarged longitudinal cross-sectional view of a state in which the blocking by the second blocking means is released. 1...Cassette holder, 3...Holder arm (rod-shaped body), 3c...Roller (engaging portion), 4...
Cassette detection lever (detection means), 4c...Lock claw (locking means), 10...Cam gear, 10a
...Spiral cam groove, 10d...Clutch plate (release means), 10f...Operation cam (detection cam), 10
g...locking piece, 10h...recess (detection cam),
16... blocking plate (first blocking means), 18... lock lever (second blocking means), 18a... cam follower, 18b... lock piece.

Claims (1)

[Scope of utility model registration request] A cassette holder 1 for holding a cassette, a first transfer means 19 for horizontally transferring a cassette inserted for loading, a detection means 4 for detecting completion of horizontal transfer by this transfer means, and a first transfer means 19 for horizontally transferring a cassette inserted for loading; A cam gear 10 has a tapered body 3 rotatably connected to a holder and a spiral cam groove 10a that engages with an engaging portion 3c of the tapered body, and is rotated from the start of horizontal transfer of the cassette to the completion of loading. has
a second transfer means for moving the cassette holder to a lower loading position by actuating the rod by engagement of the engaging portion with the cam groove; a first blocking means 16 for inhibiting the engagement of the engaging portion into the cam groove by prohibiting the operation of the clutch; a release means 10d for operating the first blocking means in a direction to release the blocking thereof; and a release means 10d provided in the detection means and locking the operation of the release means until the horizontal movement of the cassette is completed. a locking means 4c; a cam 10f for detecting the rotational phase of the cam groove integrally formed with the cam gear;
10h, a kawa follower 18a that engages with the detection cam, and a locking piece 18b that can be freely engaged and detached from the locking piece 10g that is integrally provided on the release means, so that the cam follower is in a predetermined position of the detection cam. A second locking piece engages the locking piece only when a predetermined rotational phase of the cam groove is detected by reaching the position of the cam groove, thereby preventing the releasing means from operating the first blocking means. A cassette loading/unloading device characterized by comprising a blocking means 18.