JPH02123552A - Tape pulling out mechanism - Google Patents

Abstract

PURPOSE:To simplify a tape pulling mechanism by constituting a pair of right and left tape guides and a pinch roller so as to be driven by means of a common reciprocative driving lever plate member. CONSTITUTION:To move a pair of the tape guides 54L and 54R between a saving position and a tape guiding position, further to move the pinch roller 55 between the saving position and anoperating position, an engaging common reciprocative driving lever plate member are provided to engage arm members 56L and 56R of tape guides 54L and 54R, with an arm member 58 of a pinch roller 55. The arm members 56L and 56R engages with the both sides of one part of a plate member 66, and the arm member 58 engages with the both sides of the other part of the plate member 66. A continuously connecting rod member 68 is continuously connected to a left edge part of the plate member 66, and by cum-engaging the other edge of the rod member 68 with a spiral cum groove 70 formed on the top face of a driving gear 22, the plate member 66 is reciprocatively operated in a lateral direction.

Description

[Detailed Description of the Invention] [Summary] A tape drawing mechanism includes a guide roller and a tape cassette loaded in a digital tape deck or a video tape deck to draw out the tape and apply it to the peripheral surface of an inclined drum head. A pair of left and right guide blocks, each equipped with a slant post, can be moved between the retracted position and the tape pull-out position, and this pair of guide blocks can be moved between the retracted position and the tape pull-out position. and a pair of left and right pivoting arm members that can be moved between a retracted position and a tape guide position to regulate the left and right tape pass zones for tape cassettes loaded on the deck. A pair of left and right tape guides are freely held, and a pivot arm member is movable between a retracted position and an operating position to maintain a constant running speed of the tape applied to the peripheral surface of the inclined drum head. and a pinch roller rotatably held in the tape guide, and in order to move at least the right side tape guide of the pair of tape guides between the retracted position and the tape guide position, the pinch roller is moved between the retracted position and the operating position. a common reciprocating lever plate member is used to engage and pivot the right side tape guide pivot arm member and the pinch roller pivot arm member for movement between the right tape guide and the pinch roller; The pivoting arm member of the right tape guide engages with one side of the reciprocating drive lever plate member, and the pivoting arm member of the pinch roller engages with the other side of the reciprocating drive lever plate member, and the pivoting arm member of the right side tape guide engages with the reciprocating drive lever plate member on the other side of the reciprocating drive lever plate member. The plate member is driven by cam engagement with a drive gear of the gear/linkage means.

[Industrial application field]

The present invention relates to a tape pull-out mechanism incorporated in a digital tape deck or video tape deck, which pulls out tape from a tape cassette loaded in the deck and applies it to an inclined drum head.

[Conventional technology]

As is well known, in a digital tape deck or a video tape deck, the axis of rotation of a tilted drum head is tilted with respect to a horizontal plane, and during tape playback/recording, the tape is moved along the peripheral surface of the tilted drum head. It is necessary to apply it to

For this reason, the deck is equipped with a tape pull-out mechanism that pulls out the tape from the tape cassette once loaded therein and applies it to the inclined drum head.

As an example of such a tape pull-out mechanism, one is known that is equipped with a pair of left and right guide blocks on which one guide roller and one slant post are mounted, and the pair of guide blocks is moved to the retracted position by gears/link means. and the tape draw-out position. Regarding the positional relationship between the guide rollers mounted on each guide block and the slant posts, the guide rollers are located on the front side of the slant posts.

A pair of guide blocks is normally placed in the retracted position, and when a tape cassette is loaded into the deck in this state, a pair of guide blocks are formed at the bottom of the insertion tip of the tape cassette. The tape enters the opening, and at this time, the tape crosses the front side of the guide rollers of the pair of guide blocks. That is, the pair of guide rollers are placed inside the tape portion extending between both take-up reels of the tape cassette.

On the other hand, when the tape cassette is loaded on the deck, the front opening/closing door on the insertion tip side is in an open state. Therefore, when the pair of guide blocks is moved forward from the retracted position toward the tape pull-out position, the pair of guide rollers engages with the tape portion between both take-up reels of the tape cassette, thereby causing the tape portion to It will be pulled out toward the inclined drum head side.

When the pair of guide blocks are moved to the tape pull-out position, the pair of guide rollers are positioned close to each side of the inclined drum head, and the pair of slant posts are positioned around the inclined drum in such a manner as to sandwich the inclined drum from both sides. brought into contact with a surface.

The pair of slant posts are configured as inclined pins inclined with respect to a horizontal plane, and the contact between the pair of slant posts and the peripheral surface of the inclined drum head is a line contact. Therefore, when the pair of guide blocks are moved to the tape pull-out position, the tape portion between the pair of slant posts is placed in close contact along the peripheral surface of the inclined drum head. In other words, the tape pulled out of the tape cassette is placed in a playback/recording state relative to the tilted drum head.

When a tape in a tape cassette is played back or recorded, the tape is run from left to right toward the tape cassette loading port of the deck. In other words, the tape is unwound from the left take-up reel of the tape cassette and wound onto the right take-up reel. At this time, the tape running path from the left take-up reel of the tape cassette to the guide roller of the left guide block changes depending on the amount of feed of the left take-up reel, and from the guide roller of the right guide block to the guide roller of the tape cassette. The tape running path leading to the take-up reel varies depending on the amount of winding on the right take-up reel. Note that similar variations in the tape running path may also occur when rewinding the tape in the tape cassette. Such a range of variation in the tape running path is called the tape pass zone, and it is necessary to define this tape pass zone within a predetermined range to prevent the tape from touching and damaging adjacent parts while running. .

In the conventional tape drawing mechanism described above, a pair of left and right tape guides is used to define the tape pass zone within a predetermined range, and each tape guide is in the form of a roller or a fixed body, and the tape guides are arranged in the form of a roller or a fixed body, and the tape guides are arranged in the form of a roller or a fixed body. It is designed to be able to move between the guide position and the guide position. Specifically, each tape guide is rotatably held by an arm member, and the arm member is pivotally attached to the deck chassis or the like.

A torsion spring is attached to each of the pivot axes of such a pair of arm members, whereby each arm member is elastically biased in a predetermined position, and the tape guide of the arm member is then You will have to take an evacuation position. Further, the pair of arm members are engaged with the reciprocating drive lever, and when the reciprocating drive lever is driven against the elastic biasing force of the torsion spring of the pivot shaft of each arm member, the arm member from the biased position, thereby causing the tape guide to move from the retracted position toward the tape guiding position. In short, the drive range of the reciprocating drive lever is determined in advance, and thereby the tape guide can be moved between the retracted position and the tape guide position.

As with the pair of guide blocks, the pair of tape guides is normally placed in the retracted position, and when the tape cassette is loaded onto the deck in this state, the pair of guide blocks is formed at the bottom of the insertion tip side of the tape cassette. When the tape in the tape cassette is pulled out as described above, the pair of tape guides is also moved from the retracted position to the tape guide position, and the pair of tape guides is pulled out at that tape guide position. It will be in guiding engagement with the inner running surface of the drawer tape section. The presence of such a tape guide restricts the tape pass zone as described above and prevents the tape from touching adjacent components.

When playing or recording a tape, that is, when the tape runs along the circumferential surface of the inclined drum head, the running speed must be maintained constant. This is done using a capstan and a pinch roller as in the case of . The capstan is installed, for example, on the chassis of a deck, and its installation position is set close to the tape running path from the guide roller of the right guide block at the tape pull-out position to the tape guide at the tape guide position. On the other hand, like the tape guide, the pinch roller is rotatably held by an arm member, and the arm member is pivotally attached to the chassis of the deck or the like. Further, the arm member is engaged with a reciprocating lever in the same way as the arm member of the tape guide, and the reciprocating movement of the reciprocating lever moves the pinch roller between the retracted position and the operating position (i.e., the engagement position with the capstan). ). An elastic body such as a coil spring is provided between the pinch roller and its reciprocating drive lever, so that the pinch roller is always elastically biased toward the operating position, but normally the reciprocating drive lever placed in the evacuation position. When the pinch roller occupies the retracted position and the tape cassette is loaded onto the deck, the pinch roller enters the mouth formed at the bottom of the insertion tip of the tape cassette, similar to the case of a pair of tape guides. , when the tape of the tape cassette is pulled out as described above, the pinch roller is also moved from the retracted position to the activated position, in which the pinch roller engages the capstan and pinches the tape therebetween, thereby The running speed of the tape along the circumferential surface of the tilted drum head will be maintained constant.

[Problem to be solved by the invention]

As described above, in the conventional tape pull-out mechanism, a reciprocating drive lever is used to move a pair of tape guides between the retracted position and the tape guide position, and a reciprocating drive lever is used to move the pair of tape guides between the retracted position and the tape guide position. Two reciprocating drive levers are required for movement, and this has been pointed out as one of the factors that complicates the conventional tape pull-out mechanism.

Specifically, in a conventional tape drawer mechanism, a pair of guide blocks, a pair of tape guides, and a pinch roller must move in harmony with each other within a narrow space when pulling out a tape from a tape cassette. For this purpose, the two reciprocating drive levers are driven in conjunction with the movement of the gear/linkage means for driving the pair of guide blocks.

That is, cam grooves are formed on both sides of the drive gear of the gear/link means, and links that engage with these cam grooves are connected to each of the two reciprocating drive levers, and the pair of guide blocks are driven by the drive gear. , the pair of tape guides, and the pinch roller can move in harmony with each other. It goes without saying that such a complicated configuration results from the use of two reciprocating drive levers.

Furthermore, another problem with the conventional tape pull-out mechanism as described above is that the positioning accuracy of the left tape guide in particular is poor. Specifically, in the conventional tape pull-out mechanism, the configuration on the left side is more complicated than the configuration on the right side. This is because, as mentioned above, since the capstan and the pinch roller are provided on the right side of the tape drawing mechanism, the gear/link means for driving the pair of guide blocks is provided on the left side of the tape drawing mechanism. This is because it becomes As described above, the left side of the tape pull-out mechanism has a complicated configuration, so the installation space for the arm member of the left tape guide is greatly limited.
As a result, the degree of freedom in designing the arm member is restricted, making it impossible to accurately position the tape guide at the tape guide position. That is, the distance between the point of action of the reciprocating drive lever on the arm member and the pivot axis of the arm member is the distance between the rotation axis of the tape guide rotatably held by the arm member and the pivot axis of the arm member. Since the distance the tape guide is moved from the retracted position to the tape guide position is an amplified distance of movement of the reciprocating lever, the distance of the tape guide at the tape guide position is Positioning accuracy will deteriorate. Needless to say, if such positioning accuracy is poor, the left tape pass zone cannot be precisely regulated, and the tape may come into contact with adjacent components and be damaged.

Therefore, the main object of the present invention is to provide a tape pull-out mechanism incorporated in a digital tape deck or a video tape deck, which can be made simpler than the conventional tape pull-out mechanism.

Another object of the present invention is to provide a tape pull-out mechanism incorporated in a digital tape deck or a video tape deck, which can be made simpler than the conventional one, and in particular, the positioning of the left tape guide at the tape guide position can be improved. An object of the present invention is to provide a tape withdrawal mechanism that can improve accuracy.

[Means to solve the problem]

The tape extractor mechanism according to the present invention is equipped with a guide roller and a slant post for extracting tape from a tape cassette loaded in a digital tape deck or video tape deck and applying it to the peripheral surface of an inclined drum head. a pair of left and right guide blocks that are movable between the retracted position and the tape pull-out position; and a gear/link means for moving the pair of guide blocks between the retracted position and the tape pull-out position. , rotatably held by a pair of left and right pivot arm members so as to be movable between a retracted position and a tape guide position in order to regulate the left and right tape pass zones for the tape cassettes loaded on the deck. A pair of left and right tape guides and rotatably held by a pivot arm member so as to be movable between a retracted position and an operating position in order to maintain a constant running speed of the tape applied to the peripheral surface of the inclined drum head. and a pinch roller. According to one aspect of the present invention, the pair of tape guides is moved between the retracted position and the tape guide position, and the pinch roller is moved between the retracted position and the activated position. A common reciprocating lever plate member is used to engage and pivot the guide pivot arm members and the pinch roller pivot arm members to pivot the pair of tape guide pivot arm members. The reciprocating drive lever plate member is engaged with one side of the reciprocating drive lever plate member, the pivot arm members of the pair of pinch rollers are engaged with the other side of the reciprocating drive lever plate member, and the reciprocating drive lever plate member is engaged with the pair of pinch rollers with the pivot arm members of the reciprocating drive lever plate member. It is characterized by cam engagement with the left side guide block of the blocks.

According to another aspect of the invention, the right tape guide of the pair of tape guides is moved between its retracted position and its tape guiding position, and the pinch roller is moved between its retracted position and its actuated position. A common reciprocating lever plate member is used to engage and pivot the right side tape guide pivot arm member and the pinch roller pivot arm member to move the right side tape guide. The pivot arm member is engaged with one side of the reciprocating drive lever plate member, the pivot arm members of the pair of pinch rollers are engaged with the other side of the reciprocating drive lever plate member, and the reciprocating drive lever plate member is engaged with the pivot arm member on one side of the reciprocating drive lever plate member. a pivot arm of the left tape guide for moving the left tape guide of the pair of tape guides between a retracted position and a tape guiding position; The member is featured in camming engagement with the link of the gear/linkage means.

According to still another aspect of the present invention, the right tape guide of the pair of tape guides is moved between its retracted position and its tape guiding position, and the pinch roller is moved between its retracted position and its operating position. A common reciprocating lever plate member is used to engage and pivot the right side tape guide pivot arm member and the pinch roller pivot arm member to move the right side tape guide. The pivot arm members of the reciprocating drive lever plate member are engaged with one side of the reciprocating drive lever plate member, the pivoting arm members of the pair of pinch rollers are engaged with the other side of the reciprocating drive lever plate member, and the reciprocating drive lever plate The member is driven by cam engagement with a drive gear of the gear/link means, and the left tape guide of the pair of tape guides is pivoted to move the left tape guide between its retracted position and a tape guiding position. The arm member is featured in camming engagement with the link of the gear/linkage means.

According to still another aspect of the present invention, the right tape guide of the pair of tape guides is moved between its retracted position and its tape guiding position, and the pinch roller is moved between its retracted position and its operating position. A common reciprocating lever plate member is used to engage and pivot the right side tape guide pivot arm member and the pinch roller pivot arm member to move the right side tape guide. The pivot arm member of the reciprocating drive lever plate member is engaged with one side of the reciprocating drive lever plate member, the pivot FF arm member of the pair of pinch rollers is engaged with the other side of the reciprocating drive lever plate member, and the reciprocating drive lever plate member is engaged with the pivot arm member of the reciprocating drive lever plate member. The member is driven by cam engagement with a drive gear of the gear/link means, and a gear is provided on the pivot shaft of the left tape guide of the pair of tape guides, and the gear moves the left tape guide to its retracted position. It is characterized in that it receives a rotational driving force from a drive gear of the gear/link means to move it to and from the tape guide position.

[For production]

As is clear from the above configuration, in the tape pull-out mechanism according to the present invention, when the pair of left and right guide blocks is moved from the retracted position toward the tape pull-out position by driving the gear/link means, the tape pull-out mechanism is mounted thereon. The tape is pulled out from the tape cassette by a guide roller, and when the pair of left and right guide blocks reach the tape pull-out position, the tape is applied to the peripheral surface of the inclined drum head by a slant post mounted thereon. On the other hand, when the gear/link means is so driven, the reciprocating lever plate member cam-engaged with the drive gear is moved, thereby causing the pair of tape guides to move between the pivot arm member and the reciprocating lever plate member. The pinch roller is moved from the retracted position toward the tape guide position by engagement with one side of the plate member, and the pinch roller is moved by engagement of its pivot arm member with the other side of the reciprocating drive lever plate member. It will be moved from the retracted position toward the operating position.

In another aspect of the invention, only the right tape guide of the pair of tape guides is moved from the retracted position to the tape guide position by engagement of its pivot arm member with one side of the reciprocating lever plate member. In this case, the left side tape guide of the pair of tape guides is moved from the retracted position to the tape guide position by cam engagement with the left side guide block of the pair of guide blocks.

In yet another aspect of the invention, only the right tape guide of the pair of tape guides is moved from the retracted position to the tape guide position by engagement of its pivot arm member with one side of the reciprocating drive lever plate member. When moving, the left tape guide of the pair of tape guides is moved from the retracted position to the tape guide position by cam engagement with the link of the gear/link means.

In yet another aspect of the invention, only the right tape guide of the pair of tape guides is moved from the retracted position to the tape guide position by engagement of its pivot arm member with one side of the reciprocating drive lever plate member. When moving the left side tape guide of the pair of tape guides, the gear provided on the pivot shaft of the pivot arm member receives rotational driving force from the drive gear of the gear/link means, thereby causing the left side tape guide to move. The tape guide is moved from the retracted position toward the tape guide position.

〔Example〕

Next, an embodiment of the tape pull-out mechanism according to the present invention will be described with reference to FIGS. 1 to 4 of the accompanying drawings.

1-4, a tape ejector mechanism constructed in accordance with the present invention is indicated generally by the reference numeral 10, and in this embodiment tape ejector mechanism 10 is attached to a digital tape deck chassis ( (not shown).

The tape drawing mechanism 10 includes a pair of left and right guide blocks 12.
L and 12R, this pair of guide blocks 1
2L and 12. have guide rollers 14L and 14., respectively. and slant post 16L and 16. will be installed. As shown, guide roller 14. and 1
4. are each rotatably held on the distal end side of the corresponding guide block, and the slant posts 16L and 16. are each provided on the side of the corresponding guide block and integrally therewith. The slant posts 16L and 16R are configured as tilt pins whose tilt angles (ie, angles relative to the horizontal plane) are matched to the tilt angle of the axis of rotation of a tilt drum head (not shown).

A plate member (not shown) constituting a part of the chassis of the digital tape deck extends immediately below the pair of guide blocks 12L and 12R, and a pair of guide slots are formed in the plate member. A pair of guide blocks 12L and 12. is movable along the pair of guide slots. Specifically, in FIG. 1, a pair of guide blocks 12. and 12
゜ is placed in the retracted position, but if it is moved forward along the pair of guide slots mentioned above, it will move to the forward position shown in Figures 3 and 4 (this position will later be used as the tape pull-out position). mentioned). In addition,
In FIG. 2, a pair of guide blocks 12L and 12.
is shown halfway from its retracted position (FIG. 1) to its forward position shown in FIGS. 3 and 4.

Pair of guide blocks 12L and 12. From the underside of the tip of the abutment elements 18L and 18. project beyond the guide rollers 14L and 14R, respectively, and when the pair of guide blocks 12L and 12° are moved to the forward position shown in FIGS. 3 and 4, the balancing element 18L
and 18R abut appropriate stop elements (not shown) mounted on the aforementioned plate member, thereby causing a pair of guide blocks 12L and 12. is precisely positioned in its forward position (FIG. 4).

A pair of left and right cassette guide pins 2 shown by broken lines only in Figure 1
0L and 20k (omitted from FIGS. 2 to 4 to avoid complication of illustration) are installed on the chassis of the digital tape deck, and the pair of cassette guide pins 2OL and 20 are It is used for positioning the tape cassette loaded on the deck. Specifically, holes are formed at the bottoms of both corners of the loading end of the tape cassette (not shown) to receive a pair of cassette guide pins 20° and 2OR;
The pair of holes and the pair of cassette guide pins 20. and 20. The tape cassette is precisely positioned in its loading position.

When the tape cassette is loaded into the digital tape deck in this way, the opening/closing door at the loading end of the tape cassette is opened as described in the description of the prior art, while the bottom door at the loading end is opened. A pair of guide blocks 12L and 12° are accommodated within the mouse. Therefore, the tape portion extending between the left and right tape take-up reels of the tape cassette is connected to a pair of guide blocks 12. and 12, specifically, the pair of guide rollers 14
L and 14! Therefore, the pair of guide rollers 14L and 14
When m is moved forward, the tape is pulled out from the tape cassette forward as the pair of guide rollers 14 and 1411 move. Next, a pair of guide blocks 12L and 12. is moved to the tape pull-out position (FIGS. 3 and 4), a pair of guide rollers 14L and 14. I is located close to both sides of a tilted drum head (not shown), and a pair of slant posts (16L and 16m) are brought into contact with the peripheral surface of the tilted drum in such a manner as to sandwich the drum from both sides.

In short, a pair of slant pos) 16L and 161
The tape portion in between is placed in close contact along the circumferential surface of the sloping drum head, so that the tape pulled out from the tape cassette is ready for playback/recording with respect to the slanted drum head.

Note that the right guide block 12. When the right guide roller 14R is positioned at the tape draw-out position, the right guide roller 14R is placed in contact with the fixed guide roller 21 as shown in FIGS. 3 and 4, but a similar fixed guide roller (not shown) is placed in the left Also provided on the left side guide block 12L
When the fixed guide roller 14L is positioned at the tape draw-out position, the left guide roller 14L can come into contact with or approach the fixed guide roller.

A pair of guide blocks 12L and 12. A gear/link means is used to drive the tape between the retracted position and the tape withdrawn position as described above, and the gear/link means includes a drive gear 22, an intermediate gear 24 meshing with the drive gear 22, Two driven gears 26 and 28 meshed with the intermediate gear 24, and a first link element 30 rotatably attached to the shafts of the driven gears 26 and 28, respectively. and 30. and these first link elements 30L and 30. and a second link element 32t pivotally connected to each of the second link elements 32t and 32°.

The drive gear 22 is rotatably mounted on the chassis of the digital tape deck, and its shaft is connected to a suitable rotational drive source such as an electric motor. The drive gear 22 has a special configuration, with a predetermined number (
In this embodiment, seven (7) toothed portions 34 are formed, and peripheral flanges are formed from both sides of the drive gear 220 to extend somewhat beyond the tips of the toothed portions 34. Specifically, seven peripheral flanges having a diameter somewhat larger than the diameter of the circumference passing through the tips of the seven teeth 34 are formed on both sides of the drive gear 22, and fan-shaped notches are formed in the flanges on both sides. A section 36 is formed at the location of the tooth section 34 .

On the other hand, the central gear 24 is also rotatably installed with respect to the chassis of the digital tape deck, and a toothed portion 38 is formed along the entire circumference of the central gear 24. Both sides of the central gear 24' are formed with peripheral flanges similar to those of the drive gear 22, but in FIG. 1 only the lower peripheral flange is shown, and the upper peripheral flange is shown to avoid complicating the illustration. It has been omitted for this reason. Two fan-shaped cutouts are formed in both flanges of the central gear 24 and are designated by reference numerals 40 and 42.

What should be noted here is that in the state shown in FIG. One edge of the drive gear 22 is slidably engaged with the periphery of both side flanges of the drive gear 22, as indicated by reference numeral 46, so that even when the drive gear 22 rotates, the rotational driving force is transmitted to the center. In addition, the length in the circumferential direction of the fan-shaped protrusion 44 extending between the two fan-shaped notches 36 and 40 is the same as that of the fan-shaped notch of the drive gear 22. 36, and the seven teeth 34 of the drive gear 220 are the same as the teeth 38 of the central gear 24.
The point is that only those included in the fan-shaped protrusion 44 will engage with each other. Note that the technical meaning of this point will be explained in detail later.

Two driven gears 26 and 28 are also rotatably installed with respect to the chassis of the digital tape deck, and toothed portions are formed all around them so as to constantly mesh with gear 38 of central gear 24. Driven gears 26 and 28
On the upper side of each are fan-shaped block pieces 48 and 50.
are integrally formed, and the first link element 30. Projecting pieces 48' and 50' are integrally formed adjacent to the fan-shaped block pieces 48 and 50 on the lower surface of 30R. On the other hand, a torsion spring (not shown) is provided on each of the shaft portions of the driven gears 26 and 28, and both arm portions of each torsion spring are arranged so as to sandwich the fan-shaped block pieces 48, 50 and the projection pieces 48', 50'. are engaged with them, thereby causing the fan-shaped block pieces 48,50 and the projection pieces 4 to
8' and 50' are integrated so as to elastically press each other. In short, the first link elements 30L and 30R are rotatably attached to the respective shafts of the driven gears 26 and 28 as described above, but when the driven gears 26 and 28 rotate, the first link elements 30L and 30R are 3L, 30g
Due to the presence of such a torsion spring, the driven gear 26
It is designed to be able to rotate together with 28.

As mentioned above, the drive gear 22 is provided with seven teeth 34 along a portion of its circumference, whereas the central gear 24 is provided with teeth 38 along its entire circumference. ,
Similarly, the driven gears 26 and 28 would also be provided with teeth along their entire periphery; however, in FIGS.
．． It should be appreciated that teeth 26 and 28 have been omitted where appropriate.

First link element 30. As already mentioned, the second link elements 32L and 32R are pivotally connected to the left guide blocks 12 and 30p, respectively.
．． and the right side guide block 12R are pivotally connected, and when the drive gear 22 is driven to rotate, the pair of guide blocks 12L and 12. will perform the tape drawing movement as described above. This point will be explained in detail below.

When the drive gear 22 is initially rotated in the direction of arrow A from the position shown in FIG.
0 one edge of the drive gear 2 as indicated by reference numeral 46
2 so that the central gear 24 is maintained in the position shown in FIG. The teeth 34 of the drive gear 22 mesh with the teeth 38 of the central gear 24 as they meet the fan-shaped notches 36, so the central gear 22 is rotated in the opposite direction of arrow A, that is, clockwise. It will be done. FIG. 2 shows the intermediate state when the central gear 22 is rotated in this manner, and at this time, the fan-shaped protrusions 44 on both peripheral flanges of the central gear 24 are cut into the fan-shaped protrusions 44 on both peripheral flanges of the drive gear 22. When the drive gear 22 enters into the notch 36, the seven teeth 34 of the drive gear 22 mesh only with the teeth 38 included in the fan-shaped projection 44.

As mentioned above, the fan-shaped block pieces 48 and 50 and the protrusion piece 4
8' and 50' are integrated so as to be elastically pressed against each other by a torsion spring, so that when the driven gears 26 and 28 are respectively rotated in the direction of the half-hour hand by the rotation of the central gear 24, First link element 30L
and 30R are also rotated in the direction of the half-hour hand, as shown in FIG. As a result, a pair of guide blocks 12L and 12. are first link elements 30L and 30. and second
Link elements 32L and 32. The first
It will be moved from the retracted position shown in the figure to the position shown in FIG. 2.

When the seven teeth 34 of the dog drive gear 22 are completely engaged with the teeth 38 included in the fan-shaped projection 44 of the central gear 24, the central gear 24 is rotated to the position shown in FIG. As shown in FIG. 2, both peripheral flanges of the driving gear 22 are partially intruded into the fan-shaped notches 42 of both peripheral flanges of the central gear 24, and one of the fan-shaped notches 42 is closed. The ends of the drive gear 22 are slidably engaged with the peripheries of both peripheral flanges of the drive gear 22 as indicated by the reference numeral 52, thereby maintaining the central gear 24 in the position shown in FIG. . On the other hand, the first link element 3
0L and 30R and second sink elements 32L and 32
R is displaced from the position shown in FIG. 2 to the position shown in FIG. 3, and at this time the pair of guide blocks 12L and 12. is moved to the tape draw-out position as described above.

What should be noted here is the pair of guide blocks 12L and 12. It has already been mentioned that when the central gear 24 is moved to the tape withdrawal position, its abutment elements 18L and 18° abut appropriate stop elements (not shown), until the central gear 24 reaches the position shown in FIG. Before being rotated, balance elements 18L and 18. a pair of guide blocks 12, each counterbalanced to a corresponding stop element.
This is the point where L and 12m are already positioned at the tape pull-out position. In other words, the first link elements 30L, 30. is rotated from the position shown in FIG. 1 to the position shown in FIG. 3, the first link elements 30L, 3
The first link elements 30L, 30.0- rotate integrally with the corresponding driven gears 26. 3 (i.e., after the guide blocks 12t, 12m have been positioned at the tape withdrawal position), the driven gears 26, 28 are further rotated, so that the driven gears 26, 28 are rotated further. .28 sector block piece 5
0.50' is the corresponding protrusion 48.48 as shown in Figure 3.
It means to be separated from '. In short, the fan-shaped block pieces 48.50 and the protrusion pieces 48', 5
The torsion springs that act to sandwich and elastically press the guide blocks 12L and 12R against each other are slightly expanded, and this causes the guide blocks 12L and 12R to move against their abutting elements 18.
t, 18- will be positioned at the tape draw-out position with elastically abutting against the corresponding stop element.

The tape pull-out mechanism 10 further includes a pair of left and right tape guides 54 in the form of rollers. and 54R, and a pinch roller 55 provided adjacent to the tape guide on the right side.
A pair of tape guides 54L and 54R are rotatably held at one end of arm members 56L and 56a, respectively, and a pinch roller 55 is rotatably held at one end of arm member 58. A pair of arm members 56
L and 56. is pivotally connected to the chassis of the digital tape deck at its other end, and the arm member 58 is also pivotally connected to the chassis of the digital tape deck at its other end.

1-4, the pivot axis of arm member 58 of pinch roller 55 is designated by reference numeral 60; however, in this embodiment arm member 58 is indicated by arm member 56.
The axis of the pivot shaft 60 is located on the upper side of the right tape guide 54. arm member 56. The pivot axis of the arm member 56° of the right tape guide 54R is hidden by the pivot axis 60 of the arm member 58 and cannot be seen. Note that the arm member 58 is integrally formed with the pivot shaft 60, and the pivot shaft 60 is digitally connected to the pivot shaft 60.
Pivotably held relative to the tape deck chassis;
and arm member 56. If the pivot shaft is integrally formed with the pivot shaft of the digital tape deck and the pivot shaft is pivotally held relative to the chassis of the digital tape deck, the pivot shaft 60 of the arm member 58 and the arm member 56 ．． The pivot axis 60 of the arm member 58 and the pivot axis of the arm member 56 . along with the pivot axis of the digital tape
fixed to the chassis of the deck, arm member 58 being pivotable about a pivot axis 60, and arm member 56.
is pivotable about its pivot axis, the pivot axis 60 of arm member 58 and arm member 56 . The pivot axis of the two can be integrally made common.

The pair of tape guides 54L and 54R are for regulating the tape pass zone as described in the description of the prior art, and the pinch roller 55 is installed at a fixed position relative to the chassis of the digital tape deck. The capstan 62 functions to maintain a constant running speed when the tape is run along the peripheral surface of an inclined ram head (not shown). In FIG. 1, the pair of tape guides 54L# and 54° and the pinch roller 55 are both shown in the retracted position, but the arm member 56. When the left tape guide 54 . is pivoted to the position shown in FIGS. 3 and 4, the left tape guide 54 . assumes the tape guiding position, and when arm member 56R and arm member 58 are pivoted to the position shown in FIG. It turns out. In short, by positioning the pair of tape guides 54L and 54a at the tape guide positions (FIG. 4), the tape pass zone as described above is defined within a predetermined range, while the pinch roller 55 is By positioning the tape in the operating position shown in FIG. 4, that is, in the engagement position with the capstan 62, the running speed of the tape during playback/recording is maintained constant.

In this embodiment, a pair of tape guides 54. and 54R
Separate drive means are employed to move the tape between the retracted position and the tape guide position.

First, the driving means for the left side tape guide 54L is described. It consists of a pair of guide blocks 12L and 12I.
It includes a cam plate piece 64 integrally extending from the left side guide block 12L of I, and this cam plate piece 64 can be cam-engaged with the arm member 56 of the tape guide 54L. To explain in detail, the left side tape guide 54L
The arm member 56L is always elastically biased to the position shown in FIG. 1 (at this time, the left tape guide 54L assumes the retracted position) by a torsion spring (not shown) provided on its pivot shaft. However, when the left guide block 12L is moved from its retracted position toward the tape pull-out position as described above,
The cam plate piece 64 cams into engagement with the arm member 56L as shown in FIG. 2, thereby causing the arm member 56. is pivoted from its retracted position toward the tape guide position, and when the left guide block 12L is moved to the tape pull-out position shown in FIGS. 3 and 4, the left tape guide 54. will be pivoted to its tape guide position and maintained there.

In this way, the left guide block 12. The cam plate piece 64 and arm member 56 provided on the cam plate 64 and the arm member 56. Left side tape guide 54. by cam engagement with left side tape guide 54. An advantage of moving the tape guide 54 to the tape guide position is that the left tape guide 54 can be accurately positioned at the tape guide position. I mean,
The left guide block 12.0 is positioned in the tape pull-out position by the abutment element 18.0 as described above. and the stop element (
(not shown), the positioning is extremely accurate, and as a result, the left tape guide 54L can be accurately positioned at the tape guide position.

In this embodiment, the cam plate piece 64 is connected to the left guide block 12.
．． However, if necessary, such a cam plate piece may be attached to the first link element 30L or the second link element 3.
Needless to say, the 2L setting will be available. Moreover, instead of using such a cam plate piece, a gear that meshes with the driven gear 26 is provided on the pivot shaft of the arm member 56L, thereby rotating the arm member 56L and moving the left tape guide 54L. The tape guide position @ (FIGS. 3 and 4) may be moved from the retracted position (FIG. 1).

The driving means for the right side tape guide 54R includes a reciprocating lever plate member 66. A connecting rod member 68 is connected at one end to the left end of the reciprocating lever plate member 66, and the other end of the connecting rod member 68 is connected to the left end of the reciprocating lever plate member 66. By cam-engaging the end with a spiral cam groove 70 formed on the upper surface of the drive gear 22, the reciprocating drive lever plate member 66 is made to reciprocate in the left-right direction. Specifically, the connecting rod member 70
is pivotally connected to the chassis of the digital tape deck at its center, and has a projection 7 at one end of the connecting rod member 70 that engages with the spiral cam groove 70.
2, and the other end thereof is provided with a protrusion 74 which is loosely fitted into a slot 74 formed on the left end side of the reciprocating drive lever plate member 66. Therefore, due to the rotational drive of the drive gear 22, the protrusion 72 is rotated by the drive gear 22.
2, the reciprocating drive lever plate member 66 moves to the left, and when the protrusion 72 is pulled away from the center of the drive gear 22 by the rotation of the drive gear 22, the reciprocating drive lever plate member 66 moves to the left. will be moved to the right. It goes without saying that the reciprocating drive lever plate member 66 is held so that it can be guided and moved in the left and right directions with respect to the chassis of the digital tape deck.

According to the present invention, the reciprocating drive lever plate member 66 is connected to the right side tape guide 54. It is characterized in that it is used not only to drive the pinch roller 55, but also to drive the pinch roller 55. Therefore, the reciprocating lever plate member 66 is connected to the right side tape guide 54. arm member 56. and pinch roller 5
5, so that the arm member 56 can engage with the lower surface of the reciprocating drive lever plate member 66, and the arm member 58 can engage with the upper surface of the reciprocating drive lever plate member 66. It will be done like this. More specifically, a coaxial pin element is provided on the upper and lower surfaces of the right end side of the reciprocating drive lever plate member 66, and the lower pin element is connected to the arm member 56. and its upper pin element engages arm member 58.
The straight edge of the notch 75 is adapted to engage with the straight edge of the notch 75 . In Figures 1 to 4, only the upper pin element is visible;
It is designated by the reference number 76.

Right side tape guide 54. I arm member 56. A torsion spring (not shown) is provided on the pivot axis of I,
Arm member 56. is always elastically biased to the position shown in FIG. 1 (that is, the left tape guide 54 assumes the retracted position). On the other hand, the pinch roller 55
A tension coil spring 78 is provided between the arm member 58 and the reciprocating drive lever plate member 66, so that the arm member 58 is elastically biased to bias the pinch roller 55 toward the operating position. However, in FIG. 1, the engagement of upper pin element 76 and arm member 58 causes arm member 58 to move to the position shown in FIG. 1 (i.e., pinch roller 55
takes the retracted position).

When the drive gear 22 is rotated from the position shown in FIG. 1 to the position shown in FIG. 2 in the direction of arrow A, the pair of guide members 12L and 12. has already been described that the left tape guide 45L is moved from its retracted position toward the tape pull-out position, and the left tape guide 45L is moved from its retracted position toward the tape guide position, but at this point, the left tape guide 54. and the pinch roller 55 are still parked at the retracted position. This is because when the drive gear 22 is rotated from the position shown in FIG. 1 to the position shown in FIG. 2, the protrusion 72 follows the spiral cam groove 70; Since the cam groove portion to be followed is an arc, that is, the distance between the centers of the cam groove portion and the drive gear 22 is constant,
This is because the connecting rod portion 68 is maintained in the position shown in FIG. 1, and the reciprocating drive lever plate member 66 is in a stationary state.

When the drive gear 22 is rotationally driven to the position shown in FIG. 3, the protrusion 72 is drawn towards the center of the drive gear 22, thereby pivoting the connecting rod member 68 clockwise and reciprocating drive lever plate. Member 66 is moved to the left to the position shown in FIG. As a result, arm member 56. and arm member 58 are pivoted clockwise from the position shown in FIGS. 1 and 2 to the position shown in FIG. will be moved towards its tape guiding position and the pinch roller 55 will be moved towards its operating position. In addition, in FIG. 3, as already mentioned, the pair of guide members 12L and 12. is positioned at the tape pull-out position, and the left tape guide 54L is positioned at the tape guide position.

When the drive gear 22 is rotationally driven to the position shown in FIG. its operating position (i.e., the engagement position with the capstan 62)
It will be positioned at Note that when the reciprocating drive lever plate member 66 is moved to the position shown in FIG. As a result, the capstan 62 is brought into elastic pressure contact with the capstan 62.

As is clear from the above explanation of the operation of the reciprocating drive lever plate member 66, movement of the right side tape guide 54 and the pinch roller 55 is performed by the pair of guide blocks 1
2L and 12R and the left side tape guide 54L, the reason for this is that the right side guide block 12. This is because when the and pinch rollers 55 are moved at the same time, they interfere with each other due to the installation space. Therefore, the right guide block 12. Such considerations are not required if sufficient installation space is available to prevent the pinch rollers 55 and 55 from interfering with each other.

In short, the right tape guide 54R and the pinch roller 55
It is also possible to move the pair of guide blocks 12L and 12 and the left tape guide 54L simultaneously.

In the embodiment described above, in order to move the left tape guide 54L between its retracted position and the tape guide position, a configuration is adopted in which the cam plate piece 64 protrudes from the left guide block 12L and engages with the arm member 56L. As a result, the left tape guide 54 can be positioned at the tape guide position with high accuracy. It may also be possible to move between the retracted position and the tape guide position depending on the situation.

〔Effect of the invention〕

As is clear from the above description, since at least the right side tape guide and the pinch roller of the pair of left and right tape guides are configured to be driven by a common reciprocating lever plate member, the tape pull-out mechanism according to the present invention This structure is greatly simplified compared to the structure of a conventional tape pull-out mechanism, that is, a structure that uses two reciprocating drive lever plate members, one for the tape guide and one for the pinch roller.

Further, in the present invention, when the left tape guide is moved between the retracted position and the tape guide position by cam engagement of the arm member of the left tape guide with the left guide block or its driving link element, This also has the advantage that the left tape guide can be accurately positioned at the tape guide position.

[Brief explanation of the drawing]

1 to 4 are plan views schematically showing a tape pull-out mechanism according to the present invention, in which FIG. 1 shows the tape pull-out mechanism in an inoperative state, and FIGS. 2 and 3 show the tape pull-out mechanism in an inoperative state. is shown in a partially activated condition, and FIG. 4 shows the tape withdrawal mechanism in a fully activated condition. 10... Tape drawer mechanism, 12L ・121F... Guide block, 14L
・14λ...Guide roller, 1 ・16. −・・
Slant post, 18L ・18.1... Balance element, 22... Drive gear, 24... Intermediate gear, 2
6.28... Driven gear, 30, ・30R... First link element, 32, ・32. ... Second link element, 36... Fan-shaped notch, 40, 42... Fan-shaped notch, 44... Fan-shaped protrusion, 54+, 54. ...tape guide, 56, 5
6i... Arm member, 58... Arm member, 62... Capstan, 64... Cam plate piece, 66... Reciprocating drive lever plate member, 68... Connecting rod member, 70... - Spiral cam groove, 76... Pin element, 78... Tension coil spring.

Claims (1)

[Claims] 1. One guide roller and one slant post to pull out the tape from a tape cassette loaded in a digital tape deck or video tape deck and apply it to the peripheral surface of the inclined drum head. A pair of left and right guide blocks that are mounted and movable between the retracted position and the tape pull-out position, and a gear/link means for moving the pair of guide blocks between the retracted position and the tape pull-out position. and left and right arms rotatably held by a pair of left and right pivoting arm members so as to be movable between a retracted position and a tape guide position in order to regulate the left and right tape pass zones for the tape cassettes loaded on the deck. a pair of tape guides rotatably retained on a pivot arm member for movement between a retracted position and an actuated position to maintain a constant running speed of the tape applied to the peripheral surface of the inclined drum head; a tape pull-out mechanism comprising a pinch roller, which moves the pair of tape guides between a retracted position and a tape guide position, and further moves the pinch roller between its retracted position and an operating position. A common reciprocating lever plate member is provided for engaging the pivot arm members of the pair of tape guides and the pivot arm member of the pinch roller to pivot the pivot arm members; A pivot arm member of a guide engages on one side of the reciprocating drive lever plate member, and a pivot arm member of the pair of pinch rollers engages on the other side of the reciprocating drive lever plate member; The reciprocating lever plate member is connected to the gear/
A tape drawer mechanism, characterized in that it is driven by cam engagement of a link means with a drive gear. 2. In order to pull out the tape from the tape cassette loaded in the digital tape deck or video tape deck and apply it to the peripheral surface of the inclined drum head, one guide roller and one slant post are installed and the tape is moved to the retracted position. a pair of left and right guide blocks movable between the tape pull-out position; a gear/link means for moving the pair of guide blocks between the retracted position and the tape pull-out position; a pair of left and right tape guides rotatably held by a pair of left and right pivoting arm members so as to be movable between a retracted position and a tape guide position to regulate left and right tape pass zones for the tape cassette; a pinch roller rotatably held on a pivot arm member so as to be movable between a retracted position and an actuated position to maintain a constant running speed of the tape applied to the peripheral surface of the inclined drum head; In the tape pull-out mechanism, the right tape guide of the pair of tape guides is moved between its retracted position and its tape guide position;
Moreover, the pivoting arm member of the right tape guide and the pivoting arm member of the pinch roller are engaged to pivot the pivoting arm members of the right side tape guide and the pinch roller to move the pinch roller between its retracted position and its operating position. A common reciprocating lever plate member is provided, a pivot arm member of the right tape guide engages on one side of the reciprocating lever plate member, and a pivot arm member of the pair of pinch rollers engages the reciprocating lever plate member on one side of the reciprocating lever plate member. The drive lever plate member is engaged with the other side of the drive lever plate member, and the reciprocating drive lever plate member is driven by cam engagement with the drive gear of the gear/link means, and drives the left side tape guide of the pair of tape guides. A tape drawer mechanism characterized in that a pivot arm member of the left tape guide is cam-engaged with a left guide block of the pair of guide blocks for movement between a retracted position and a tape guide position. 3. In order to pull out the tape from the tape cassette loaded in the digital tape deck or video tape deck and apply it to the peripheral surface of the inclined drum head, one guide roller and one slant post are installed and the tape is moved to the retracted position. a pair of left and right guide blocks movable between the tape pull-out position; a gear/link means for moving the pair of guide blocks between the retracted position and the tape pull-out position; a pair of left and right tape guides rotatably held by a pair of left and right pivoting arm members so as to be movable between a retracted position and a tape guide position to regulate left and right tape pass zones for the tape cassette; a pinch roller rotatably held on a pivot arm member so as to be movable between a retracted position and an actuated position to maintain a constant running speed of the tape applied to the peripheral surface of the inclined drum head; In the tape pull-out mechanism, the right tape guide of the pair of tape guides is moved between its retracted position and its tape guide position;
Moreover, the pivoting arm member of the right tape guide and the pivoting arm member of the pinch roller are engaged to pivot the pivoting arm members of the right side tape guide and the pinch roller to move the pinch roller between its retracted position and its activated position. A common reciprocating lever plate member is provided, a pivot arm member of the right tape guide engages on one side of the reciprocating lever plate member, and a pivot arm member of the pair of pinch rollers engages the reciprocating lever plate member on one side of the reciprocating lever plate member. The drive lever plate member is engaged with the other side of the drive lever plate member, and the reciprocating drive lever plate member is driven by cam engagement with the drive gear of the gear/link means, and drives the left side tape guide of the pair of tape guides. A tape drawer mechanism characterized in that a pivot arm member of the left tape guide cams into engagement with a link of the gear/link means for movement between a retracted position and a tape guide position. 4. Installing one guide roller and one slant post to pull out the tape from the tape cassette loaded in the digital tape deck or video tape deck and apply it to the peripheral surface of the inclined drum head, and move the tape to the retracted position. a pair of left and right guide blocks movable between the tape pull-out position; a gear/link means for moving the pair of guide blocks between the retracted position and the tape pull-out position; a pair of left and right tape guides rotatably held by a pair of left and right pivoting arm members so as to be movable between a retracted position and a tape guide position to regulate left and right tape pass zones for the tape cassette; a pinch roller rotatably held on a pivot arm member so as to be movable between a retracted position and an actuated position to maintain a constant running speed of the tape applied to the peripheral surface of the inclined drum head; In the tape pull-out mechanism, the right tape guide of the pair of tape guides is moved between its retracted position and its tape guide position;
Moreover, the pivoting arm member of the right tape guide and the pivoting arm member of the pinch roller are engaged to pivot the pivoting arm members of the right side tape guide and the pinch roller to move the pinch roller between its retracted position and its activated position. A common reciprocating lever plate member is provided, a pivot arm member of the right tape guide engages on one side of the reciprocating lever plate member, and a pivot arm member of the pair of pinch rollers engages the reciprocating lever plate member on one side of the reciprocating lever plate member. The drive lever plate member is engaged with the other side of the drive lever plate member, and the reciprocating drive lever plate member is driven by cam engagement with the drive gear of the gear/link means, and the left side of the pair of tape guides is engaged with the drive lever plate member. The pivot shaft is provided with a gear, the gear receiving a rotational driving force from the drive gear of the gear/link means for moving the left tape guide between its retracted position and its tape guiding position. tape drawer mechanism.