Automatic disc changer for a disc reproducing system

An automatic disc changer has a casing for the automatic disc changer, and a plurality of disc holders arranged in the casing. The disc holder stores a plurality of discs in vertical position so that each disc can be removed from the disc holder. A plurality of reproducing devices are provided in the casing to be moved along the disc holder. The reproducing device has an opening at a side confronting the disc holder. A loading arm is provided for loading the disc passing through the opening. A wire is connected to opposite sides of the casing along the disc holders so as to prevent the disc stored in the disc holder from removing. A plurality of rollers are disposed in the reproducing device around the opening. The wire is engaged with the rollers so as not to obstruct the opening and to allow each reproducing device to be independently moved from the other reproducing device.

BACKGROUND OF THE INVENTION 
The present invention relates to a disc reproducing for reproducing 
information recorded on a disc such as a CD, and more particularly to an 
automatic disc changer system in the reproducing system. 
Japanese Patent Application Laid-open 60-138769 discloses an automatic disc 
changer system, whereby it is possible to store a large number of discs in 
a small space in the system, to change a disc at a high speed, and to meet 
requests for a simple structure with an accurate operation. 
FIG. 24 shows the system. The system comprises a casing 1 having a pair of 
tray holders 2 secured thereto. A disc tray (not shown) on which a 
plurality of CDs are mounted in the vertical disposition is detachably 
mounted between the holders 2. A pair of pulleys 4 are rotatably mounted 
on opposite side plates 3 of the casing 1. A wire 5 is provided between 
the pulleys 4 for preventing the discs stored in the tray from removing 
from the tray. An end 6 of the wire 5 is secured to a side of a disc 
reproducing device 10 through a spring 7. The other end 8 of the wire is 
secured to an opposite side of the reproducing device 10. The reproducing 
device 10 is movable in the directions A and B along the discs between the 
side plates 3. The device 10 has a disc Loading device 20 provided on a 
front portion thereof so as to pick up a selected disc from the tray and 
load the disc in the device 10 through an opening 11. 
In an automatic changing operation of the disc, when one of the discs is 
selected to be reproduced, the reproducing device 10 is horizontally moved 
in the direction A or B and stopped at the position of the selected disc. 
In this state, the wire 5 is circulated together with the reproducing 
device 10 so that the wire does not obstruct the movement of the device. 
By the spring 7 on the wire, a predetermined tension is exerted on the 
device 10. 
At the position, the selected disc is loaded by the loading device 20 in 
the reproducing device 10 through the inlet 11. 
In the system, the wire 5 is secured to the device 10 and extended over the 
disc tray so that the disc which is accidentally removed from the tray 
caused by vibration is prevented from removing. 
However, since the wire has a predetermined length and secured to the 
reproducing device 10, it is impossible to provide a plurality of 
reproducing devices in the casing, because the reproducing devices are 
connected with each other by the wire and each reproducing device can not 
be independently moved in order to reproduce a desired disc. 
SUMMARY OF THE INVENTION 
An object of the present invention is to provide an automatic disc changer 
system in which a plurality of disc reproducing devices can be provided in 
order to quickly change discs. 
According to the present invention, there is provided an automatic disc 
changer for a disc reproducing system having a casing for the automatic 
disc changer, and a disc holder provided in the casing, the disc holder 
storing a plurality of discs in vertical position so that each disc can be 
removed from the disc holder. 
The automatic disc changer has a reproducing device provided in the casing 
to be moved along the disc holder, the reproducing device having an 
opening at a side confronting the disc holder, and a loading and 
discharging means for loading and discharging the disc passing through the 
opening, a wire connected to opposite sides of the casing along the disc 
holder so as to prevent the discs stored in the disc holder from removing, 
and a plurality of rollers disposed on the reproducing device around the 
opening, 
The wire is engaged with the rollers so as riot to obstruct the opening and 
to allow the reproducing device to be moved. The wire is extended over the 
rollers in a form of an inverted U-shape, 
The other objects and features of this invention will become understood 
from the following description with reference to the accompanying drawings 
.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIG. 1, a disc reproducing system having an automatic disc 
changer system according to the present invention comprises a casing 100, 
and a door 110 provided in front of the casing 100. In the casing 100, a 
disc reproducing device 200 having a disc loading mechanism, a plurality 
of disc holders 300, and an auxiliary disc holder 400 are provided. The 
reproducing device 200 is movably mounted in the casing along the holders 
300 disposed in the horizontal direction. The auxiliary disc holder 400 
has a plus-one mechanism and is provided adjacent to the end holder 300. 
Referring to FIG. 2, the door 110 has a transparent window 111 made of 
plastic, and a vertical inlet 112 formed corresponding to the auxiliary 
disc holder 400. 
Referring to FIG. 3, the disc reproducing system of the present invention 
has two disc reproducing devices 200 slidably mounted on rails 102 and 
104. Each of the disc reproducing devices 200 has a casing 201, a vertical 
opening 202 formed in a front portion of the casing 201, and four rollers 
203 rotatably mounted around the inlet 202. A driving device (not shown) 
is provided in the reproducing device 200 for driving the reproducing 
device 200 along the rails 102 and 104. A wire 210 is provided between 
opposite side plates 101 of the casing 100 for preventing a disc stored in 
the disc holder 300 from removing from the holder. An end 211 of the wire 
210 is connected to the side plate 101 of the casing and the other end 212 
of the wire is connected to the other side plate 101 through a spring 213. 
The wire 210 is engaged with the four rollers 203 of each disc reproducing 
device 200 in the shape of an inverted U-shape so as to avoid the opening 
202. Thus, the reproducing devices 200 can be independently moved along 
the wire 210 and the rails 102 and 104. 
As shown in FIG. 1, the reproducing device 200 has a disc loading arm 220 
rotatably mounted in the casing 201 and projected from the opening 202 to 
the disc holder 300. 
Referring to FIG. 4 showing the disc holders 300 in the casing 100, four 
disc holders 300 are horizontally arranged corresponding to the front 
portions of the reproducing device 200. A plurality of optical discs 310 
are stored in each holder 300 arranged in the horizontal direction. Each 
of the discs 310 is held in the holder in a vertical disposition so as to 
be removed from the holder. 
Each of the disc holders 300 comprises a base plate 308 having 
approximately an L-shape in section to be pivotally mounted on a 
supporting plate 120 provided in the casing 100, and a pair of side plates 
301 having a curved periphery. 
Referring to FIGS. 5a and 5b, a plurality of holding plates 303 are 
vertically secured to the base plate 308 between the side plates 301 at a 
predetermined distance so as to form a space 304 between a pair of holding 
plates 303 for holding the disc 310. Each of the holding plates 303 has 
the same configuration as the side plate 301 in plane, and an upper end 
portion thereof is tapered (FIG. 6). 
The disc holder 300 further has a front panel 315 secured to a front end of 
the base plate 308 to be downwardly projected. A plurality of perforations 
305 are formed, arranged in the horizontal direction corresponding to the 
spaces 304. On a lower portion of the perforations 305, an encoder 307 
having a plurality of detecting perforations 306 is provided corresponding 
to the perforations 305. 
On the base plate 308, a slide plate 320 and a movable frame 330 are 
attached. 
The slide plate 320 has an elongated opening 321, projecting portion 323 
having a pin 324, and a plurality of lugs 322 formed corresponding to the 
perforations 305 of the front panel 315 at every other perforations. A 
pair of side notches 325 are formed on opposite sides of the slide plate. 
The movable frame 330 comprises a guide plate 331 formed on a lower 
portion, a plurality of horizontally arrange projections 336 formed on an 
upper end portion, and a middle plate 337 provided between the guide plate 
331 and the projections 336. The guide plate 331 has a cam slit 332 having 
cam portions 333 and 334 to be engaged with the pin 324 of the slide plate 
320, and a pair of guide pins 335 provided on opposite sides. The cam 
portions 333 and 334 are deflected by the pitch of the space 304. Each 
production 336 is in the form of a triangular prism to be engaged with the 
tapered ends of the holding plates 303. 
As shown in FIG. 6, a bottom side of the triangular prism of the projection 
336 has a length of one pitch of the space 304 between the holding plates 
303 and provided to be engaged with every other space 304. Thus, the 
distance between the apexes of the projections 336 is twice as much as the 
pitch of the space 304. 
Referring to FIG. 7, the base plate 308 has a pair of connecting lugs 302 
rotatably engaged with the supporting plate 120 through connecting pins 
302a (FIG. 5a), a pair of engaging projections 340 provided on opposite 
sides corresponding to the side notches 325 of the slide plate 320, and a 
pair of guide grooves 343 engaged with the guide pins 335 (FIG. 5b) of the 
guide plate 331 of the movable frame 330. A hook 342 is provided on the 
central portion for a spring 341. An engaging projection 345 is provided 
to be engaged with the opening 321 of the slide plate 320. 
In order to assemble the slide plate 320 and the movable frame 330 on the 
base portion of the base plate 308, the side notches 325 of the slide 
plate 320 are engaged with the corresponding projections 340, while the 
engaging projection 345 is engaged with the opening 321. The spring 341 is 
provide between a hook formed on the periphery of the opening 321 of the 
slide plate 320 and the hook 342 of the base plate 308 to urge the slide 
plate 320 to the front panel 315. Thus, the lugs 322 of the slide plate 
320 are abutted on the periphery of the perforations 305 on the front 
panel at every other perforations. 
The guide plate 331 of the movable frame 330 is mounted on the projecting 
portion 323 of the slide plate 320 and the cam slit 322 is engaged with 
the pin 324, while the guide pins 335 (FIG. 5b) are slidably engaged with 
the guide grooves 343 of the base plate 308. The middle plate 337 is 
mounted between the connecting lugs 302, and the projections 336 are 
mounted on the upper ends of the holding plates 303. 
A cover plate 350 is mounted on the movable frame 330 and secured to the 
base plate 308 at the upper portions thereof. Thus, the movable frame 330 
is movably held on the base plate 308 with the cover plate 350. 
As shown in FIGS. 8a and 8b, when the door 110 of the casing 100 is opened, 
the disc holder 300 can be rotated about the connecting pins 302a to be 
exposed from the casing. Thus, the disc 310 in the holder 300 can be 
easily taking out from the casing to be changed. 
Referring to FIG. 9 showing the disc reproducing device 200, the disc 
loading arm 220 is rotatably mounted on a shaft 221 secured to an inner 
frame 230. A disc discharging arm 223 is rotatably mounted on a shaft 222 
secured to the inner frame 230. The loading arm 220 has a loading end 220a 
and a guide grooves 224 to be engaged with the periphery of the disc 310. 
The discharging arm 223 has a discharging end 223a and a guide groove 225 
to be engaged with the periphery of the disc 310. The loading am 220 and 
the discharging end 223a of the discharging arm 223 are adapted to pass 
through the inlet 202. Each of the guide grooves has a width slightly 
larger than the thickness of the disc 310. 
On a lower portion of the inner frame 230, a slider 234 having a push rod 
233 is slidably mounted. When a selected disc 310 is reproduced in the 
reproducing device 200, the slider 234 is moved in the direction shown by 
an arrow and the push rod 233 is engaged with a corresponding perforation 
305 of the selected disc in the disc holder 300. After reproduction, when 
the disc is returned to the stored position, the slider 234 is moved in 
the reverse direction so that the push rod 233 is retracted from the 
perforation. 
In order to load the disc 310 to a center P (clamping position), a position 
adjusting member 226 is rotatably mounted on an opposite surface of the 
inner frame 230 and urged in the direction a by a spring (not shown). The 
position adjusting member 226 has a pair of projections 227 and 228 
provided on upper and lower ends thereof to be projected from elliptic 
holes 231 and 232 formed in the inner frame 230. 
As shown in FIG. 10, when the disc 310 engages with the projections 227 and 
228, the adjusting member 226 is rotated in the direction b against the 
spring force so that the projections 227 and 228 are rotated to be 
entirely engaged with the respective holes 231 and 232. 
In the present invention, two sizes of the discs can be loaded by the 
.Loading mechanism, for example the disc 310 having the diameter of 12 cm 
and a disc 311 having the diameter of 8 cm. 
The automatic changing operation of the disc will be described. 
When a disc 310 to be reproduced is selected, one of the disc reproducing 
devices 200 is moved along the wire 210 to the selected disc in the holder 
300. The rollers 203 provided on the reproducing device 200 are rotated on 
the wire 210 which is not circulated, so that the only selected device can 
be freely moved. Since the wire 210 is horizontally expanded along the 
disc holders 300, the discs 310 mounted in the holders are prevented from 
removing. 
The disc is selected in accordance with an address. A position sensor is 
mounted in the device 200 for detecting an on/off signal by the 
perforation 306 of the encoder 307. Thus, the position of the selected 
disc is detected by the device 200. 
At the selected position, the slider 234 in the device 200 is moved to the 
left of FIG. 9 so that the push rod 233 is inserted into the perforation 
305 corresponding to the selected disc. In the disc holder 300, the lugs 
322 of the slide plate 320 engage with every other perforations 305. 
Namely, there are no lugs on the perforations 305 corresponding to the 
spaces 304 storing the discs of the even numbers. On the other hand, the 
lugs close the perforations 305 corresponding to the discs of the odd 
numbers. Thus, when the push rod 233 is abutted on the lug 322 through the 
perforation 305, the lug is pushed so that the slide plate 320 is slid 
against the spring 341. The pin 324 of the slide plate 320 engaged with 
the cam slit 332 is slid to be engaged with the cam portion 333 so that 
the movable frame 330 is moved to the right in FIG. 5b. Thus, the 
projections 336 are moved by the one pitch of the space 304 to open the 
spaces 304 where the discs of the odd numbers are stored. 
The loading end 220a of the loading arm 220 is inserted into a space 
between the projections 336 and into the space 304 between holding plate 
303. As hereinbefore described, the distance between the apexes of the 
projections 336 is twice as much as the pitch of the space 304, the arm 
220 is smoothly engaged with the disc. 
It will be understood that the loading arm 220 is inserted into the space 
304 for the disc of the even number without engaging with the lug 322 and 
hence without shifting the projections 336. 
A loading operation of the disc 310 of 12 cm for the automatic changer 
system will be described, first, with reference to FIGS. 9, 11 and 12. 
As shown in FIG. 9, at the selected position, the loading arm 220 is 
rotated in the counterclockwise direction. The loading end 220a is 
inserted into the space between the projections 336 and into the space 
304. The guide groove 224 is engaged with the disc 310. The arm 220 is 
further rotated so that the disc is removed from the space 304 of the 
holder 300 and inserted into the inlet 210 of the device 200. The disc is 
engaged with the end 223a of the discharging arm 223 in the device 200 and 
the guide groove 225 as shown in FIG. 11. 
Both of the arms 220 and 223 are further rotated in the counterclockwise 
direction. A periphery of the disc 310 is engaged with the projection 227 
of the position adjusting member 226 so that the projection 227 is rotated 
in the direction b and engaged with the hole 231. The projection 228 
engages with the hole 232, accordingly. As shown in FIG. 12, the disc is 
loaded to the clamping position P. The disc is clamped to a turntable (not 
shown) by a clamper (not shown). In this state, since the end 220a of the 
loading arm 220 is disengaged from the disc 310. The disc is reproduced 
without disturbed by the arm. 
After reproduction, the disc 310 is clamped to the position P and the 
discharging arm 223 is rotated in the clockwise direction to engage the 
end 223a with the disc. The disc is pushed to be disengaged from the 
projections 228 and 227. Thus, the adjusting member 226 is rotated in the 
direction a by the spring to be returned to the position. The guide 
grooves 224 and 225 of the arms engage with the periphery of disc and 
guide the disc to be discharged from the inlet 202. Thus, the disc is 
stored in the holder. The slider 234 is moved to disengage the rod 233 
from the perforation 305. 
Consequently, the slide plate 320 is slid by the spring 341 to return to 
the home position and hence the movable frame 330 is moved to return to 
the original position. 
Describing a loading operation of the disc 311 of 8 cm with reference to 
FIGS.. 13, 14 and 15, the operation is approximately the same as the disc 
310. Namely, the arm 220 is rotated to engage the disc 311 in the space 
304 at the end 220a so as to remove the disc 311 from the space. The disc 
311 is loaded in the device 200 through the inlet 202 by the end 220a and 
engaged with the end 223a of the arm 223 as shown in FIG. 14. The disc 311 
is guided to the clamping position P by the ends 220a and 223a. Since the 
disc 311 is smaller than the disc 310, the disc 311 is not engaged with 
the projection 227 of the adjusting member 226. At the position P, the 
disc 311 is engaged with the projection 228 which is not rotated and held 
in the position P by the end 220a of the arm 220 and the projection 228 as 
shown in FIG. 15. 
When discharging the disc 311, the disc 311 is guided by the ends 233a and 
220a to be discharged from the inlet 202. 
Referring to FIG. 16 showing the auxiliary disc holder 400, the holder 
comprises a left frame member 420 and a right frame member 440. A vertical 
inlet 410 is formed between the left and right frame members corresponding 
to the inlet 112 of the door 110. On the side of the holder 400 
corresponding to the disc reproducing device 200, a vertical space 401 is 
formed between the frame members. The loading arm 220 of the reproducing 
device 200 can be inserted into the space 401. 
Referring to FIGS. 18 and 19, the left frame member 420 has a supporting 
member 424 pivotally mounted on a shaft 423. The supporting member 424 is 
urged to the space 401. The supporting member 424 has a pair of rollers 
422a and 422b rotatably mounted thereon. As shown in FIG. 17, the roller 
422a (422b) is mounted in the inclined disposition. An upper end of the 
shaft 423 is rotatably engaged with a support 435. A lower end of the 
shaft is secured to a gear 425 having a pulley 425a coaxial with the gear 
425. A belt 427 is provided between the pulley 425a and a drive shaft 426a 
of a motor 426. The motor 426 is operated for loading the disc in the 
holder 400 when the disc is inserted into the inlet 410. The gear 425 
engages with a gear 428 which engages with a gear (not shown) for rotating 
rollers 422a and 422b. The supporting member 242 further has a cam member 
433 provided on a lower portion thereof. 
The left frame member 420 has a hole 420a corresponding to the reproducing 
device 200 to be engaged with the push rod 233 of the slider 234. A slider 
430 is provided on the lower portion to be slidable in the direction shown 
by an arrow. The slider 430 has a pair of slits 431 and tapered end 430a 
engaged with the cam member 433 of the supporting member 424. In the slit 
431, a pin 432 secured to the left frame member is engaged. 
A lock member 421 is rotatably mounted on a shaft 436 secured to the left 
member 420 at the inlet 410 for preventing the disc from inserting into 
the inlet 410. The lock member 421 has a lower engaging portion 437 
engaged with a lower end of the supporting member 424 and an upper lock 
portion 438 (FIG. 17) to be projected on the inlet 410. 
As shown in FIG. 21, felts 439a, 439b and 439c are provided on the left 
frame member 420. 
FIG. 22 shows the right frame member 440. The right member 440 has a 
grooves 441 and 442 formed corresponding to the rollers 422a and 422b of 
the left member 420, and felts 443a, 443b and 443c. An engaging groove 444 
is provided to be engaged with the lock portion 438 of the lock member 
421. 
The operation of the auxiliary disc holder 400 will be described. 
When the disc 310 (not shown) is inserted into the inlets 112 and 410, a 
sensor (not shown) in the holder 400 detects it to drive the motor 426. 
The motor 426 rotates the drive shaft 426a to rotate the gear 425 through 
the belt 427 and the pulley 425a. Thus, the gear 428 is rotated to rotate 
the rollers 422a and 422b. The disc 310 is loaded in the holder 400 and 
the lower portion of the disc is abutted on the rollers 422a, 422b which 
are inclined on the supporting member 424. When the disc is loaded on a 
predetermined position, the motor 426 stops. The disc is engaged with the 
rollers 422a and 422b and the felts 439a to 439c and 443a to 443c to be 
stably held in the holder. 
It will be seen that length of the roller is determined to a half of the 
length of the inlet 410. 
In this state, if another disc is inserted into the inlet 112, the 
periphery of that disc is engaged with the disc in the holder, so that the 
disc can not be inserted into the holder. 
In reproducing operation, the reproducing device 200 is moved to the holder 
400 and the push rod 233 of the slider 234 is inserted into the hole 420a 
to push the slider 430 to the right of FIG. 19. Thus, the tapered end 430a 
is engaged with the cam member 433 of the supporting member 424 to urge 
the supporting member 424 away from the space 401. Thus, the rollers 422a 
and 422b are disengaged from the disc. When the supporting member 424 is 
moved, the lower end thereof is abutted on the engaging portion 437 to 
rotate the lock member 421 in the clockwise direction of FIG. 17. Thus, 
the upper lock portion 438 is projected on the inlet 410. The disc is 
loaded in the reproducing device 200 by the arms 220 and 223 in the same 
manner as hereinbefore described. 
FIG. 23 shows a modification in which a single disc reproducing device 200 
is provided. As a further modification, three or more reproducing devices 
can be provided. 
In place of the rollers 203, a pin can be used. 
The projections 336 of the triangular prism in the movable frame 330 can be 
replaced in the other shape, such as a semi-cylindrical shape. 
In accordance with the present invention, the wire 210 secured to the side 
plates 101 of the casing 100 is engaged with the rollers 203 rotatably 
mounted on the respective reproducing devices 200 so as to allow the 
devices to move with respect to the wire. Thus, one of the reproducing 
devices 200 can be independently moved, regardless of the other 
reproducing device. Consequently, it is possible to provide a plurality of 
reproducing devices 200 in the casing without disturbed by the wire. 
Since the spring 213 is provided on the wire 210 secured to side plate 101 
so as to determine the tension of the wire, the tension of the wire is 
easily adjusted. 
The projections 336 of the movable frame 330 are slidably mounted on the 
holding plates 303 of the disc holder 300 to be engaged with spaces 304 at 
every other spaces. The loading end 220a of the loading arm 220 in the 
reproducing device 200 is guided to the disc 310 stored in the space 304 
through the space between the projections 336. Since the upper ends of the 
spaces 304 adjacent to the space 304 for the selected disc 310 are engaged 
with the projections 336, the loading end 220a is accurately inserted into 
the space 304 of the selected disc. Even if the position accuracy of the 
loading arm and the space is deteriorated, the loading of the disc is 
accurately operated. The dimension of parts are easily managed. 
While the presently preferred embodiment of the present invention has been 
shown and described, it is to be understood that this disclosure is for 
the purpose of illustration and that various changes and modifications may 
be made without departing from the scope of the invention as set forth in 
the appended claims.