JPH0441472Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a cassette holder setting mechanism in a magnetic recording/reproducing apparatus such as a rotary head type digital audio tape recorder.

[Conventional technology]

Conventionally, this type of magnetic recording/reproducing apparatus has been provided with a cassette holder setting mechanism that allows the tape exposed side of the cassette to face the tape loading position, such as a mechanism for pulling the cassette into the cassette holder and a cassette holder following the mechanism. Generally, it is constructed of a completely separate mechanism from the dropping mechanism.

[Problems that the idea should solve]

This conventional structure has the problem that the process from inserting the cassette to loading the tape cannot always be carried out smoothly, and can sometimes cause undesired mechanical troubles.

[Means to solve the problem]

In order to solve these conventional problems, this idea is
A sliding plate is provided that can move freely in the front and back directions of the housing according to the vertical movement of the cassette holder attached to the housing, while a cam drive connecting plate attached to this sliding plate is connected with forward and reverse arcuate grooves. A cam drive pin protruding from a rotatable drive plate is inserted into this arcuate groove, and as the drive plate rotates, the cam drive pin slides through the positive arcuate groove. The cam drive plate is prevented from moving during the period when the cam drive pin is sliding in the opposite arcuate groove, and the cam drive plate is allowed to move in the front and back direction of the housing. .

[Effect]

When the cassette begins to be inserted into the cassette holder, the drive motor is driven and the drive plate begins to rotate.
Until the cassette is completely retracted into the cassette holder, the cam drive pin of the drive plate slides within the regular arc-shaped groove of the cam drive connection plate, and the cam drive pin slides within the reverse arc-shaped groove. When the tape loading starts, the cam drive connecting plate starts to move rearward, and in response, the cassette holder starts lowering to the cassette tape loading position, and the cassette holder is set.

【Example】

This invention will be explained below based on the embodiments shown in FIGS. 1 to 18. Note that this embodiment describes a rotary head type digital audio tape recorder as a magnetic recording/reproducing device. In FIG. 1, a housing 2 having a substantially U-shaped cross section is fixed to the upper surface of a chassis board 1 with screws 3. As shown in FIG. A cassette holder 5 into which a cassette 4 can be inserted substantially horizontally is mounted inside the casing 2 so as to be vertically movable. Further, a substantially gate-shaped arm 6 is rotatably attached to a pivot shaft 41 at the rear end of the housing 2, that is, at the end on the tape loading side.
The ends of both legs 6a and 6b of this arm 6 are each pivotally supported by the cassette holder 5 via a connecting shaft pin 64. A pair of cassette stoppers 55 are formed at a tape loading side end of the cassette holder 5 at a predetermined distance. A guide hole 7 extending in the insertion direction of the cassette 4 is formed in the top surface of the casing 2.
A slide hook 8 is slidably attached to. A hook pin 9 is protruded from the upper part of the slide hook 8, and the hook pin 9 is inserted into a first sliding slot 11 formed at one end of the rotating plate 10. Further, a rotation shaft 12 is provided on the top surface of the housing 2, and a rotation plate 10 is rotatably supported on the rotation shaft 12. This rotating plate 1
A second sliding elongated hole 13 is formed at the other end of 0, that is, at a portion opposite to the first sliding elongated hole 11 with the rotation shaft 12 in between. On the other hand, one side wall of the housing 2 (lower side in Figure 1)
A mount 15 is fixed to the mount 15, and a drive gear 17 constituting a drive mechanism 16 is attached to the mount 15. A drive motor (not shown) is connected to the drive gear 17, and a drive shaft 18 of the drive gear 17 is connected to the drive motor (not shown).
A substantially fan-shaped drive plate 19 is integrally attached to the drive plate 19 . Further, an arc-shaped guide groove 20 is formed in the drive plate 19 along a part of the outer periphery of the drive support shaft 18, and an intermediate gear 21 is formed in this arc-shaped guide groove 20.
The intermediate support shaft 21a is slidably inserted therein,
This intermediate gear 21 meshes with the drive gear 17 and has internal teeth 22 formed on the inner edge of the outer periphery of the drive plate 19.
It's starting to fit together. The drive support shaft 18 and the intermediate support shaft 21a are connected by a connecting plate 23, and a drive lever 14 is attached to the drive support shaft 18, and a drive pin protrudes from the tip of the drive lever 14. 65 is inserted into the second sliding elongated hole 13 of the rotating plate 10. Further, the cam drive connecting plate 24 provided in the drive mechanism 16 is formed with a regular arcuate groove 25 and a reverse arcuate groove 26 connected to this groove. A cam drive pin 27 protruding from the end of the drive plate 19 is slidably inserted into these grooves 25 and 26 to ensure a predetermined movement (described later) of the cam drive connection plate 24. It's getting old. Further, a tongue piece 30 extending to the side of the slide plate 29 is connected to the cam drive connection plate 24 via a connection pin 28, and the front end of the cam drive connection plate 24, that is, the cassette retraction side At the end of the intermediate gear 21
An intermediate support shaft 21a is attached. A switch 29A for detecting the start of cassette retraction and a switch 29B for detecting the start of tape loading are mounted on the mounting base 15 at predetermined intervals. The cassette retraction start detection switch 29A is provided with an actuator 29a that can come into contact with a pressing protrusion 31 formed at the end of the drive plate 19. Tape loading start detection switch 29B
is provided with an actuator 29b that can come into contact with the tape loading side end of the cam drive connecting plate 24. On the other hand, on the inside of the side wall of the housing 2 on the side where the drive mechanism 16 is provided, as shown in FIG. It is rotatably mounted. An operating pin 35 is attached to one end of the lid opening lever 33 and is loosely engaged with a notch 36 formed in the upper part of the slide plate 29. In addition,
An inclined edge 37 is formed in the notch 36, and the direction of this inclination is formed such that the rear (right side in FIG. 2) of the housing 2 is lower than the front (left side in FIG. 2). . In addition, the lid opening lever 3
The other end of 3 functions as a rotating claw 38, and this rotating claw 38 is connected to the cassette 4, which will be described later.
It is adapted to be rotated by hooking the tape protection lid 62. Approximately in the center of the slide plate 29 is an inclined elongated hole 39 whose major axis is located higher on the tape loading side (right side in Figure 2) than on the insertion side of the cassette 4 (left side in Figure 2). A guide pin 40 protruding from one leg 6a of the arm 6 is slidably inserted into this oblique elongated hole 39. This guide pin 40 is formed in the side wall of the mounting case 2, and has a guide elongated hole 47 whose major diameter direction is in the upward direction.
It is inserted through the shaft so that it can move up and down. Further, the arm 6 is rotatable around a pivot shaft 41 provided at the rear end of the housing 2, while the rear end bracket 6c of the arm 6 is provided with a chassis board 1. A coil spring 42 is attached between the arm 6 and the arm 6 to urge the arm 6 to rotate clockwise in FIG. Note that the cassette 4 is attached to both ends of the slide plate 29.
A pair of guide elongated holes 4 whose major diameter direction is the insertion direction of
3 and 44 are formed respectively, and the guide slot 4
Horizontal sliding pins 45 and 46 protruding from the side wall of the housing 2 are slidably inserted into the pins 3 and 44, respectively. Further, a guide tongue piece 48 extends from the lower end of the side wall of the cassette holder 5, and a vertical guide elongated hole 49 whose major axis is in the vertical direction is formed in this guide tongue piece 48. A vertical guide pin 50 protruding from the side wall of the housing 2 is slidably inserted into the hole 49 . FIG. 3 shows details of the slide hook 8 slidably attached to the guide hole 7 of the housing 2, and a falling wall 51 extends approximately below the center of the slide hook 8. At the same time, a switch operating shaft 53 is provided on the boss 52 near the falling wall 51. As shown more clearly in FIG. 4, an operating plate 54 is attached to the switch operating shaft 53 and is rotatable around it. It can come into contact with the actuator 57 of the attached switch 56 for detecting completion of cassette retraction. Note that the end of the actuation plate 54 can come into contact with an actuation regulating pin 58 protruding from the bottom of the top surface of the housing 2 (see FIG. 5). 6 to 8 show the drive mechanism 16 more clearly, and the connecting pin 28 that connects the cam drive connecting plate 24 and the slide plate 29 has the longitudinal direction in the moving direction of the slide plate 29. Slight movement is possible within the slide elongated hole 59 (see Figure 1), and a coil spring 60 is tensioned between the connecting pin 28 and the tape loading side end of the cam drive connecting plate 24. It is set up. Next, FIGS. 9 and 10 show an example of a cassette 4 used in this device, and the upper surface of the cassette 4 has a recess into which a retracting pawl 8a formed at the tip of the slide hook 8 engages. In addition, a tape protection lid 62 with a substantially L-shaped side surface is rotatably attached to the front surface of the cassette 4, that is, on the tape loading side, around a rotation pin 63. . The operation of the device configured in this way will be explained below. Before the insertion of the cassette 4 into the cassette holder 5, the tip of the slide hook 8 is located at the end of the guide hole 7 on the cassette insertion side, as shown in FIG. 29A, the pressing protrusion 31 of the driving plate 19 presses the actuator 29a, and thereby the driving gear 1
The driving of the drive motor connected to 7 is stopped. Next, when the insertion of the cassette 4 into the cassette holder 5 is started, the tip of the slide hook 8 engages with the recessed part 61 of the cassette 4, while the rotation of the rotating plate 10 starts to press the driving plate 19. Projection 31
The pressing state of the actuator 29a is released, and as a result, the drive motor starts to drive and
As the cassette 4 begins to rotate, the cassette 4 is automatically drawn into the cassette holder 5. When the drive gear 17 begins to rotate in this manner, the cam drive pin 27 slides while being guided by the circular arc groove 25 of the cam drive connecting plate 24, and this sliding trajectory is also the rotation trajectory of the drive plate 19. Therefore, the cam drive connecting plate 24 does not move during this sliding period. However, the cam drive pin 27 does not fit into the regular arc groove 25.
When it slides to the end of the slide hook 8, that is, to the boundary with the reverse arcuate groove 26, the movement of the slide hook 8 is blocked by the operation regulating pin 58, which also prevents the rotation of the rotating plate 10. Although rotation of the drive plate 19 is blocked, the drive motor continues to rotate, and the drive gear 17 and the intermediate gear 21 continue to rotate, so the intermediate support shaft 21a slides along the regular arc-shaped groove 25. At the same time, the cam drive pin 27 starts sliding along the reverse arcuate groove 26. That is, the cam drive connecting plate 24 begins to move along the side wall of the housing 2 toward the tape loading side. In this case, when the slide hook 8 is prevented from sliding, the actuating plate 54 rotates as shown in FIG. 5 to actuate the cassette retraction completion detection switch 56; As long as the cassette 10 does not rotate toward the insertion side of the cassette 4, that is, as long as the cassette eject operation following unloading does not occur, the cassette 4 is continuously held. Furthermore, after the slide hook 8 is prevented from sliding, the slide plate 29 also starts moving toward the tape loading side in conjunction with the movement of the cam drive connecting plate 24, so that the arm 6
The guide pin 40 protruding from is guided by the oblique elongated hole 39 and guided by the elongated guide hole 47, and begins to slide downward. As a result, the arm 6 begins to rotate around the pivot shaft 41, and the cassette holder 5, which is connected to the arm 6 via the connecting shaft pin 64, begins to descend. In this way, the movement of the vertical guide pin 50 is restricted at the upper end of the vertical guide elongated hole 49, and the cassette holder 5
When the tape reaches the lowest point, the movement of the slide plate 29 and the cam drive connecting plate 24 is also restricted, and at the same time, the end of the cam drive connecting plate 24 on the tape loading side detects the start of tape loading of the cassette 4. switch 29B. When the cassette holder 5 starts to descend, the sliding plate 29 moves and the slanted edge 37 of the notch 36 comes into contact with the actuating pin 35, and the opening lever 33 rotates around the rotating pin 34 as shown in FIG. However, since the rotating claw 38 of the opening lever 33 hooks the lower end of the tape protection lid 62 of the cassette 4 (see Fig. 14), when the opening lever 33 rotates, the tape The protective lid 62 also begins to rotate. Moreover, when the cassette holder 5 descends to the tape loading position, the opening of the tape protection lid 62 by the opening lever 33 is completed (see FIGS. 15 and 16). Further, when the loading of the cassette holder 5 is completed, the cam drive connecting plate 24 activates the actuator 29b of the tape loading start detection switch 29B.
However, even if a drive stop signal is supplied to the drive motor at this time, the inertia of the drive motor causes it to continue rotating, so the cam drive connecting plate 24 slides against the biasing force of the coil spring 60 through the elongated hole 59. Move within the sliding range of the connecting pin 28 inside. and,
When the drive motor stops, the coil spring 60
The cam drive connecting plate 24 is moved in the opposite direction by the urging force. In other words, drive gear 17, intermediate gear 2
1 and the internal teeth 22 are released from their dead center meshing state. In this manner, when the tape loading start detection switch 29B is activated, the tape is pulled out from the tape exposed side of the cassette 4 and loaded onto the rotary head or the like. On the other hand, when ejecting the cassette 4, the tape and cassette are pulled back into the cassette by a signal during unloading, and then the drive motor is reversed to perform the opposite operation to the above, and in the final stage, the cassette holder 5, which has been raised, is The cassette 4 is pushed out from inside by the falling wall 51 of the slide hook 8.

[Effects of the invention] As described above, according to this invention, the rotation of the drive gear is controlled via the cam drive connecting plate from the time when the cassette is inserted into the cassette holder to when the cassette is brought to the tape loading position. Since the transmission can be performed mechanically and continuously, it is possible to smoothly set the cassette holder.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the configuration of an embodiment of this invention, Fig. 2 is a side view thereof, Fig. 3 is a sectional view taken from Fig. 1, and Figs. 4 and 5 are for detecting completion of cassette retraction. Figures 6 to 8 are back views for explaining the operation of the switch, and Figures 6 to 8 are diagrams for explaining the drive mechanism in more detail.
The figure is a cross-sectional view of FIG. 1, FIG. 8 is a perspective view of the drive plate, and FIGS. 9 and 10 are views for explaining the cassette. FIG. 9 is a plan view of the cassette, and FIG. 11 and 12 are diagrams for explaining the state in which the cassette has been completely drawn into the cassette holder, FIG. 11 is a plan view thereof, FIG. 12 is a side view thereof, and FIGS. 13 to 16. Figure 13 is a side view of the main part showing the state before the cassette holder starts its lowering operation, and Figure 14 shows the cassette tape protection lid and opening lid at that time. Figure 15 is a side view of the main part showing the relationship with the lever, Figure 15 is a side view of the main part showing the state when the lowering movement of the cassette holder is completed, and Figure 16 is the relationship between the tape protection lid of the cassette and the opening lever at that time. FIGS. 17 and 18 are views for explaining the state of the cassette at the start of tape loading, FIG. 17 is a plan view thereof, and FIG. 18 is a side view thereof. 2...Housing, 4...Cassette, 5...Cassette holder, 6...Arm, 10...Rotating plate, 12...
... Rotation shaft, 17 ... Drive gear, 19 ... Drive plate,
21... Intermediate gear, 21a... Intermediate support shaft, 22...
... Internal teeth, 24 ... Cam drive connecting plate, 25 ... Regular circular arc groove, 26 ... Reverse circular arc groove, 27 ... Drive pin, 29 ... Slide plate, 39 ... Inclined elongated hole, 4
0... Guide pin, 47... Guide slot.

Claims (1)

[Claims for Utility Model Registration] A cassette holder into which a cassette can be inserted is provided in a casing so as to be movable up and down, and a rotating plate for moving the cassette back and forth within the cassette holder is connected to the cassette holder, and a drive motor is connected to the cassette holder. A drive plate rotatably supporting a driven gear is rotatably provided in the casing, and is connected to the cassette holder and formed on the casing to guide vertical movement of the cassette holder. A guide pin inserted into a long guide hole whose major diameter direction is in the vertical direction is provided in a protruding manner, and an arm is provided so as to be rotatable in the vertical direction by a rotation shaft provided in the housing, a slide plate having an inclined elongated hole inserted through which the guide pin is guided and displaced downward when the drive plate moves in the front-rear direction and rearward; internal teeth are formed on the inner side of the part, and an intermediate gear is interposed between the internal teeth and the drive gear in a meshing state, and a cam drive connecting plate connected to the support shaft of the intermediate gear is connected to the slide plate. At the same time as attaching it to
The cam drive connecting plate is formed with a regular circular arc groove along the rotation locus of the drive plate and a reverse circular groove that communicates with the regular circular groove, and a drive pin that slides in both circular arc grooves is provided. By providing the cam drive pin on the drive plate, during the period when the cam drive pin slides along the regular circular arc groove of the cam drive connection plate, movement of the cam drive connection plate is prevented, and the cam drive pin is provided in the reverse circular arc groove. A cassette holder in a magnetic recording/reproducing apparatus characterized in that, during a period of movement along an arcuate groove, the cam drive connecting plate and the slide plate are moved in the front and back direction to move the cassette holder up and down. Setting mechanism.