JPH0481276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic tape device that can be used in tape recorders, video tape recorders, and the like.

Construction of conventional examples and their problems In recent years, VTRs have been widely used in which magnetic tape is wound on a reel, pulled out from a built-in cassette to the outside of the cassette, and run along a rotating magnetic head drum to record and reproduce signals. I'm starting to be able to do it. Among these, so-called slot-in type VTRs, in which the cassette is inserted through the front opening of the device, have become popular because of the effective use of the space above the device. A conventional slot-in type VTR will be explained below with reference to the drawings. First, to explain the operation when loading a cassette, as shown in FIG. , the switch 5 is activated, and the motor 6 shown in FIG. Therefore, the driving wheel 9 rotates clockwise in FIG. The driving wheel 9 rotates clockwise to transfer the cassette holding member 7 in the A direction and then in the B direction, so that the cassette 4 moves to the position shown by the two-dot chain line in FIG. direction, and is mounted at a predetermined position on the main board 3 as shown in FIG. 1b. In this state, the reel stand 8 rotatably arranged on the main board 3 and the reel in the cassette 4 (not shown)
and are engaged. At this time, the protrusion 10 provided on the drive wheel 9 hits the switch 11 attached to the side surface, resulting in the state shown in FIG. 2b, the switch 11 is activated, the rotation of the motor 6 is stopped, and the cassette loading is completed. Next, to explain the cassette ejecting operation, when a switch (not shown) provided in the device is activated, the motor 6 rotates in the opposite direction to that when the cassette was inserted, and the cassette 4 is transported along a path opposite to the above operation. The state returns to the state shown in FIG. 1a. At this time, the protrusion 10 provided on the drive wheel 9 hits the switch 12,
The state shown in FIG. 2a is reached, the switch 12 is activated, the rotation of the motor 6 is stopped, and the cassette removal operation is completed. The control of the drive means described above is carried out by inputting inputs from each switch into a programmed microcomputer (not shown), and the microcomputer is configured to ignore switch operations when unnecessary. In the above configuration, the switch 1 controls the completion of loading and unloading operations of the cassette 4 and the driving means.
It is important for magnetic tape devices to synchronize the timing of operations 1 and 12. However, the control switches conventionally used are two leaf-type switches 11 and 12, which pose problems such as operating position accuracy and mounting accuracy. For this reason, there was a problem in the work of adjusting the mounting positions of the switches 11 and 12 to match the operation timing with the driving wheel 9 after the device was assembled.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks and provides a slot-in type magnetic tape device that does not require adjustment of the mounting position of a control switch and is easy to assemble.

Composition of the Invention In order to achieve the above object, the magnetic tape device of the present invention has a cassette 4 containing a magnetic tape wound on a reel in a first direction substantially parallel to the main board 3 of the device and in a first direction substantially parallel to the main board 3. On the other hand, the cassette 4 is moved in a second vertical direction to mount and eject the cassette 4 at a predetermined position. The drive means 9, 18, 19, 20, the slider 22 that rotates synchronously with the drive means 9, 18, 19, 20, and the same board that can detect the mounting position and ejection position of the cassette 4. The driving means 9, 1 consists of a plurality of conductive parts 26, 27, 28 formed.
8, 19, and 20, and a control circuit that operates and stops the motor 6 that drives the drive means 9, 18, 19, and 20 according to the detection operation of the detection switch. It is something.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, a first embodiment shown in FIGS. 3 to 8 will be described. In FIG. 6, the rotation of the motor 6 fixed to the side of the frame 13 placed on the main board is carried out by a small pulley 14, a belt 15, a large pulley 16, a worm 17, a worm wheel 18,
The signal is transmitted to the drive wheel 9 via the small gear 19 and the intermediate gear 20. The intermediate gear 20 and the lower side of the intermediate gear 20 are constructed as shown in FIG. That is, a slider 22 made of an elastic metal material is attached to the inside of the intermediate gear 20 made of an insulating material, and this slider 22 is provided with three sets of legs 23, 24, and 25. Further, on the upper surface of the substrate 21 made of an insulating material, three sets of independent conductive parts 26, 27, 28 of different lengths are formed by etching or printing.
is attached to the shaft 29 attached to the frame 13 together with the intermediate gear 20 by an E ring 30 or the like, and the substrate 21 is prevented from rotating by a positioning protrusion 31 provided on the frame 13. . Also, the three pairs of legs 23, 24, 25 of the slider 22 fixed to the intermediate gear 20 are attached to the base plate 21.
By rotating and sliding on three sets of conductive parts 26, 27, and 28 provided on the upper surface of the switch, a rotary switch with two contacts per circuit is constructed, with the conductive part 26 as a common terminal. A part of the driving wheel 9 is formed into a convex portion 33 having an elongated hole 32, as shown in FIG. 6th
The part where the members on the front side of the frame 13 in the figure have been removed is the same as the conventional magnetic tape device, and the third
It is configured as shown in the figure. i.e. frame 1
A first moving member 34 and a second moving member 35, which are integrated with the cassette holding member 7, are disposed on the opposite side of the drive wheel 9 of No. 3. The first moving member 34 and the second moving member 35 have racks 3 at opposing positions, respectively.
6, 37 are formed, and these racks 36, 37 are formed.
The rotational center shaft 39 of the pinion 38 that engages with the pinion 37 is engaged with the elongated hole 32 of the drive wheel 9 described above. The rotation center shaft 39 also engages with a guide key groove 40 of the frame 13 and an elongated hole 41 of the first moving member 34 . The first moving member 34 and the second moving member 35 are structured so that they can move relative to each other only in the direction of arrow A or the direction opposite to the direction of arrow A.
A roller 43 that rotates around a pin 42 formed in the second moving member 35 engages with an elongated hole 44 formed in the frame 13, and the roller 43 rotates around a pin 42 formed in the second moving member 35.
It serves as a guide when the movable member 35 integrally moves up and down in FIG. 3b. The inner surface on the opposite side of the frame 13 also has a structure substantially similar to that shown in FIG. 3, so a description thereof will be omitted. As shown in FIG. 5, a push-type switch 5 is attached to the upper surface of the frame 13.The operation of the magnetic tape device of this embodiment constructed as above will be described below.
As shown in FIG. 5b, when the cassette 4 is inserted approximately parallel to the main board 3 through the cassette insertion opening 2 provided in the outer box 1, the cassette 4 hits the switch 5 and the motor 6 starts to rotate. rotate clockwise,
The rotation center shaft 39 shown in FIG. 3b also begins to move in the direction of arrow A in FIG. 5b. When the drive wheel 9 rotates and the rotation center shaft 39 moves in the direction of arrow A, the pinion 38 is engaged with the racks 36 and 37, so the first moving member 34 moves by half the amount of movement of the rotation center shaft 39.
Move in the direction of double arrow A. When the drive wheel 9 further rotates, the rotation center shaft 39 descends along the vertical portion of the keyway 40, so the first moving member 34 and the second moving member 35 descend as one, and the cassette 4 moves downwards as a unit. Diagram c
As shown in FIG. 2, the reel is mounted at a predetermined position on the device, and the reel stand 8 and the reel of the cassette 4 are engaged with each other. At this time, the relationship between the drive wheel 9 and the intermediate gear 20 is as shown in FIG.
8 changes from its previously non-conductive state to a conductive state via the slider 22, and a microcomputer (not shown) stops the rotation of the motor 6, completing the cassette loading operation. Next, the cassette ejecting operation will be explained. When a cassette ejection switch (not shown) provided on the device is operated, the motor 6 rotates in the opposite direction to that at the time of insertion, and the cassette 4 is transferred in the opposite direction to that at the time of insertion, resulting in the state shown in FIG. 5b. . At this time, the relationship between the drive wheel 9 and the intermediate gear 20 is as shown in FIG. 6 stops rotating, and the cassette ejecting operation is completed.

As described above, according to this embodiment, the switch that stops the rotation of the motor 6 is formed on the substrate 21 and attached to the intermediate gear 20 that rotates in synchronization with the conductive parts 26, 27, 28 and the drive wheel 9. removed slider 22
The rotating and sliding type switch has high operating position accuracy, and the drive wheel 9 after the magnetic tape device is assembled.
There is no need to adjust the operation timing of the switch and the operation timing of the switch.

Also, this rotary and sliding switch can be used as the 9th switch if necessary.
As shown in the figure, conductive parts 26, 27, 28 for switches similar to those described above are directly formed on a printed circuit board 45 for attaching a connector and a tape end detection transistor (not shown), and the same sliding By providing and attaching the gear 46 to which the child 22 is attached and the rivets 47 for attachment, the conductive part 2
6, 27, and 28 can be formed directly up to the connector mounting position, and it is possible to obtain a rotary and sliding type switch with high accuracy and low cost similar to the above.

Effects of the Invention As described above, according to the present invention, it is possible to detect the installation and ejection stop positions of the holding member that holds the cassette with a single detection switch, and also to detect the operation timing of the drive means after the magnetic tape device is assembled. There is no need to adjust the switch operation timing, and a compact magnetic tape device that is easy to assemble and inexpensive can be obtained.

[Brief explanation of the drawing]

1A and 1B are side views of main parts showing the cassette loading operation in a conventional slot-in type magnetic tape device, FIGS. 2A and 2B are explanatory diagrams of the switch operation of the same magnetic tape device, and FIG. 3 8 shows a first embodiment of the present invention, FIGS. 3 a to 3 c are a plan view of the main part, a side view of the main part, and a rear view of the main part, FIG. 4 is a sectional view of the main part, and FIG. 5 is a sectional view of the main part. a to c are explanatory diagrams of cassette mounting operation;
Fig. 6 is a side view of the drive section, Fig. 7 shows the configuration of the switch section, a is a plan view of the board, b is a sectional view showing the relationship between the board and the intermediate gear, and c is the intermediate gear and slider. FIGS. 8a and 8b are explanatory diagrams of the operation of the switch, and FIG. 9 is a side view of the drive section in another embodiment of the present invention. 1...Exterior box body, 2...Cassette insertion slot, 3...
...Main board, 4...Cassette, 5...Switch, 6
... Motor, 7 ... Cassette holding member, 8 ... Reel stand, 9 ... Drive wheel, 13 ... Frame, 14
...Small pulley, 15...Belt, 16...Large pulley, 17...Worm, 18...Worm wheel, 19...Small gear, 20...Intermediate gear, 21...
...Substrate, 22...Slider, 23, 24, 25...
Foot portion, 26, 27, 28... Conductive portion, 29...
Shaft, 32...Elongated hole, 33...Protrusion, 34...First
Moving member, 35... Second moving member, 36, 37...
... Rack, 38 ... Pinion, 39 ... Rotation center shaft, 40 ... Key groove, 41 ... Elongated hole, 42 ... Pin, 43 ... Roller, 44 ... Elongated hole, 45 ... Printed circuit board, 46 ...gear, 47...tack.

Claims (1)

[Claims] 1. A cassette 4 containing a magnetic tape wound on a reel is transported in a first direction approximately parallel to the main board 3 of the device and in a second direction above and below the main board 3, and a predetermined position of the cassette 4 is transferred. A holding member 7 configured to be mounted and ejected into a position and holding the cassette 4; driving means 9, 18, 19, 20 for driving the holding member 7 by rotational movement; and the driving means 9. , 18, 19, 20, and a plurality of conductive parts 2 formed on the same substrate that can detect the mounting position and ejection position of the cassette 4.
The driving means 9, 18,
a detection switch that detects the rotational phase of the components 19 and 20; and a motor 6 that drives the drive means 9, 18, 19, and 20 in accordance with the detection operation of the detection switch.
A magnetic tape device consisting of a control circuit that stops the