JP3328587B2 - Automatic cassette positioning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette positioning device for positioning a film cassette at a fixed position in a case body, regardless of the size of the film cassette, when taking an X-ray photograph for medical diagnosis.

[0002]

2. Description of the Related Art Conventionally, as a cassette positioning device of this type, a cassette is once supported between bars opposed in parallel, and then is moved toward a side end in the device by using a roller driven by a motor. There has been devised a device or the like that can move the cassette to position the cassette.

[0003]

The conventional cassette positioning apparatus has the disadvantage that it takes time to automatically position and eject the cassette, making it difficult to perform quick photographing, and has a complicated structure in many cases.

In view of the above-mentioned disadvantages, the present invention enables the film cassette to be quickly and accurately positioned at a plurality of positions of the case body regardless of the size thereof, and allows the film cassette to be quickly sent out to the insertion slot after photographing is completed. It is an object of the present invention to provide a cassette positioning device which is relatively easy to construct and can be provided at a low cost.

[0005]

In order to achieve the above object, an automatic cassette positioning apparatus according to the present invention comprises a case body, a vertically moving device and a left and right moving device for a cassette, and the case body is provided on one side thereof. A cassette insertion port is provided, and the vertical transfer device is provided with a vertical transfer belt having a length extending from a central portion to a lower portion at a predetermined distance on both right and left sides of the case body, Along with a cassette tray extending in the left-right direction between both transfer belts,
The drive shaft of the transfer belt is provided with a mechanism for detecting the moving distance of the cassette tray, so that the cassette tray can be moved a predetermined distance in the vertical direction, the left and right transfer device is located in the upper part in the case body A guide rail is laid, and at the end of the insertion port side, a pushing carriage is provided so as to be able to protrude and retract from the upper surface of the base plate, and a movable carriage having a belt clamping device capable of clamping a belt at the bottom when power is supplied is provided. On the opposite end, a moving carriage with a pushing piece protruding from the upper surface of the base plate is mounted, and a left and right transfer belt is runably bridged between the left and right walls of the case body. The bottom of the movable carriage on the insertion port side is detachably formed on the belt by the belt clamping device, and the bottom of the movable carriage on the opposite side is fixed to the belt. Move the carriage to the inside and The are configured to be transported in the left-right direction central portion of the case body.

An automatic cassette positioning apparatus according to the present invention comprises a case body, a cassette vertical transfer device, a left and right transfer device, and a cassette sensor. The case body has a cassette insertion port provided on one side thereof. The above-mentioned vertical transfer device is arranged so that the upper and lower transfer belts of a length extending from the lower part to the substantially central part can be run on the left and right side parts in the case body, respectively, and can be extended in the left and right direction to the cassette mounting part. A cassette tray provided with a through-hole of a predetermined length in the longitudinal direction is provided between the two transfer belts, and a drive shaft of the vertical transfer belt is provided with a mechanism for detecting a vertical movement distance of the cassette tray. The left and right transfer device has a left and right transfer belt below the cassette mounting portion of the cassette tray, and the upper surface thereof is Along with projecting slightly from the hole and running over the through hole, the left and right transfer belt drive shafts are provided with a mechanism for detecting the moving distance of the cassette tray in the left and right direction, and the inserted cassette is moved by the left and right transfer belt. The cassette sensor can be transported to the center in the left-right direction of the case body, and the cassette sensor includes a light emitting unit and a light receiving unit.
The cassette is provided at an insertion opening in the case so as to detect that a predetermined portion of the cassette has been inserted into the case.

Further, the cassette automatic positioning device according to the present invention is provided with a cassette pressing device provided with a pressing plate which moves vertically by a predetermined distance along a guide rail at a cassette insertion opening in a case body. The upper end of the cassette is pressed by the pressing plate to prevent the cassette from falling.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Next, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 through 6 show a standing type cassette automatic positioning device, 1 is a rectangular casing, is formed with insertion opening 2 of the cassette a is in its right side surface. 3
Is a lid, which is made of a transparent body 4 except for its peripheral edge,
In addition, a grid plate 5 is attached to the back surface.

Reference numeral 7 denotes an up-and-down moving device for a cassette a provided from the center to the lower side of the case body. The driving shaft 8 and the driven shaft 9 are provided with belt gears 10 at both left and right ends. The upper and lower transport belts 12 and 12 are stretched between both shafts 8 and 9 at a predetermined interval. A rotation shaft of a drive motor 13 is connected to the left end of the drive shaft 8 so that the upper and lower transport belts 12 can run at the same speed in the vertical direction. A brake 14 is connected to the right end of the upper end 8 so that the upper and lower transport belts 12 can be stopped at predetermined positions. 15 is cassette a
The cassette tray supports the lower end of the upper and lower transport belts 12, and is fixed to the upper surfaces of the upper and lower transport belts 12, 12, respectively.

Reference numeral 16 denotes a moving distance detecting mechanism, which comprises a disk hub 17 having small holes provided at regular intervals around a disk, and a photosensor 18.
And the drive shaft 8. Then, the disk hub 17 is rotated with the rotation of the drive shaft 8, the number of light beams passing through the small holes is counted by the photo sensor 18, and the detection signal is sent to the microcomputer control device 42 to send the cassette The moving distance of the tray 15 can be automatically adjusted.

Therefore, the cassette tray 15 moves up and down as the vertical transfer belt 12 moves up and down. When the cassette tray 15 is raised, when the upper end of the cassette a presses the sensing plate 48 , the micro switch 49 is activated to drive the drive motor. 13 stops, and the cassette a can be held at the upper end of the case body 1 for a predetermined time. Further, by lowering the cassette tray 15 by half of the ascending distance, the cassette a is held at the center of the case body 1 for a predetermined time, and by lowering the cassette tray 15 to the initial position, the cassette a The lower end can be held for a predetermined time.

Reference numeral 21 denotes a left and right transfer device for the cassette a,
A guide rail 22 having a length extending to both left and right ends thereof is laid on an upper portion in the case body 1. Reference numerals 23 and 24 denote left and right moving carts, each having a surface on which a cassette a is mounted on a surface of a base plate 25, and a guide roller 26 provided on the back surface thereof, and a left and right direction along the guide rail 22. It is possible to move to.

Reference numeral 27 denotes a moving mechanism for the left and right movable carts. A drive pulley 28 rotated by a drive motor 29 is provided on the left side wall of the case body 1, and a driven pulley 30 is provided on the right side wall thereof. Then, a left and right transfer belt 31 is wound between the pulleys 28 and 30, and the back surface of the left and right transfer carriage 24 is connected to the left and right transfer belt 31.

Numeral 32 denotes a belt clamping device provided at the bottom of the right and left movable carriage 23. The belt 33 includes a brake 33 provided with a pulley 34 at an upper end thereof and a contact plate 35 via a left and right transfer belt 31. It is. Thus, when the brake 33 is not operated, the pulley 34 idles and the carriage 23 does not move even if the transfer belt 31 moves.
Since the transfer belt 31 is sandwiched between the support plate 34 and the backing plate 35, the right and left and right movable carriage 23 can move left and right with the movement of the transfer belt 31.

Reference numeral 36 denotes a pushing piece of a cassette a provided at a right end of the right and left moving cart 23, and 37 denotes a pushing piece of a cassette a provided at a left end of the left and right moving cart 24. Is attached to the rotating shaft of the rotary solenoid 38, and the tip is formed so as to be able to protrude from the upper surface through a through hole 39 provided in the base plate, and the left pushing piece 37 protrudes from the upper surface of the left end of the base plate. I have. Each of the pushing pieces 36 and 37 is formed so that its height is slightly lower than the thickness of the cassette a.

The left and right side walls in the case body 1 include:
Micro switches 40 and 41 are provided, respectively, and when the right and left moving carriage 23 moves to the right and hits the micro switch 40, the brake 33 of the belt clamping device 32 is released,
The right / left / right moving carriage 23 stops at the right corner of the case body. When the left / right moving carriage 24 moves to the left and hits the micro switch 41, the power of the drive motor 29 is turned off, the left / right moving belt 31 stops, and the left / right moving carriage 24 can stop at the left corner of the case body. It is.

Reference numeral 42 denotes a microcomputer control device, which is based on each electric signal from the cassette sensing microswitch, the photosensor 18 of the moving distance detecting mechanism 16, the cart microswitches 40 and 41, and the X-ray emission completion signal. The drive motors 13 and 29 of the up and down and left and right moving carts are automatically controlled by a microcomputer.

Reference numeral 43 denotes a middle plate that covers the entire inside of the case body 1. A slit 44 is provided on the upper right side to move the right pushing piece 36, and a support rod for the right pushing piece 37 is provided on the upper left side. A slit 45 for moving is provided, and slits 47 for moving a spacer 46 provided on the cassette tray 15 are provided on both lower left and right sides.

Next, the operation of the automatic cassette positioning apparatus will be described. In this cassette automatic positioning device, the rear surface of the case body 1 is fixed to the front side of the holding tube of the X-ray imaging table in which the holding tube is fitted to a support standing on the base so as to be able to move up and down. Is used.

When the cassette a is inserted into the case body 1 through the insertion slot 2, its lower end is placed on the cassette tray 15. At this time, the pushing piece 36 of the right and left moving cart 23 is
It is immersed in the base plate 25 so as not to hinder insertion. When the sensor detects that cassette a has been inserted correctly,
Each of the upper and lower transfer belts 12 and 12 operates to raise the cassette tray 15, but when the upper end of the cassette presses the sensing plate 48 at the upper end of the case body, the micro switch 49 operates to turn off the power of the drive motor 13. Cut and stop. Immediately, brake
33 is activated to move the left and right transfer belt 31 between the backing plate 35 and the pulley 34.
, And the pushing piece 36 of the right and left and right movable carriage 23 projects above the base plate.

When the drive motor 29 is operated to move the left and right transfer belt 31 in the direction of arrow b, the right and left and right moving carriage
23 moves to the center while pushing the right side of the cassette a with the pushing piece 36, and the left and right moving cart 24 simultaneously moves to the center while pushing the left side of the cassette with the pushing piece 37.
Since the cassettes 3 and 24 move the same distance, the cassette a is carried to the center of the case body and is accurately positioned at the center of the upper end thereof.

X-ray photography is performed while the examinee presses the body against the surface of the lid 3 of the case body 1. , A clear X-ray image can be obtained.

When the photographing is completed, the discharge of the cassette a is started by the X-ray emission end signal. That is, the left and right moving cart 24
Is moved to the right while pushing the cassette with the pushing piece 37, and at the same time, the vertical transfer belt 12 moves, and the cassette tray 15
Is lowered toward the initial position, and stops when the right end of the cassette protrudes from the insertion slot 2 by about 2 cm. At this time, the right and left moving carriage 23 is stopped at the loading position in a state where the pushing piece 36 is immersed in the base plate 25 so as not to hinder the ejection of the cassette.

When the cassette is taken out, the left and right moving carriage 24 moves leftward, and when the left end of the carriage pushes the left micro switch 41, the drive motor 29 of the left and right transfer belt 31 stops. Stop at the initial position. On the other hand, the right / left / right moving carriage 23 moves rightward, and stops when the right end of the carriage presses the right micro switch 40, so that the brake 33 is released, and thus the carriage 23 stops at the initial position. The above series of operations can be automatically controlled by the microcomputer controller 42.

In the above case, the case where the cassette insertion slot 2 is provided on the right side of the case body 1 has been described. However, the case may be provided on the left side. In this case, the configuration and operation of the two right and left movable carts 23 and 24 are described. Is just the opposite of the above description.

In the above example, the case in which the cassette a is positioned at the center of the upper end of the case 1 has been described. However, after the center in the left-right direction is aligned with the center of the case, the cassette tray is moved by the moving distance detecting mechanism 16. If the cassette 15 is lowered by half of the rising distance, the cassette can be accurately positioned at the center of the case body 1, and if the cassette tray is lowered to the initial position, the cassette can be accurately positioned at the center of the lower end of the case body 1. It can be positioned, and may be set in advance according to the imaging site.

[0027]

Embodiment 2 FIGS. 7 to 9 show another embodiment of the cassette automatic positioning device. Numeral 50 denotes a vertically moving device for the cassette a provided from the center to the lower portion in the case body, and its structure is the same as that described in the first embodiment. That is, a drive shaft having belt gears 53 attached to both left and right ends.
51 and the driven shaft 52 are juxtaposed at predetermined intervals in the vertical direction,
Upper and lower transfer belts 54 are stretched between the two shafts. In addition, a rotation shaft of a drive motor 55 is connected to the right end of the drive shaft 51 so that both upper and lower transport belts 54 can run at the same speed in the vertical direction.

Reference numeral 56 denotes a cassette tray which has a substantially L-shaped cross section and extends in the left-right direction. The horizontal portion 57 on which the lower end of the cassette a is placed has a wide width to which a left-right transfer belt 73 described later can be loosely fitted. Are formed. The left and right sides of the rear surface of the cassette tray 56 are respectively connected to the upper and lower transfer belts.
It is fixed to the upper surface of 54, 54.

Reference numeral 60 denotes a vertical moving distance detecting mechanism, which comprises a disk hub 61 having small holes provided at regular intervals around a disk and a photosensor 62. The drive shaft 51 is connected to the drive shaft 51 via the drive shaft 51. Thus, the disk hub 61 is rotated with the rotation of the drive shaft 51, the number of light beams passing through the small holes is counted by the photo sensor 62, and the detection signal is sent to the microcomputer controller.
100, the moving distance of the cassette tray 58 can be automatically adjusted.

Accordingly, the cassette tray 56 moves up and down as the upper and lower transport belts 54 move up and down. When the upper end of the cassette a pushes the sensing plate 64 at the time of ascending, the microswitch 65 is activated to drive the drive motor. 55 is stopped, and the cassette a can be held at the upper end of the case body 1 for a predetermined time. Further, by lowering the cassette tray 56 by half of the rising distance by the moving distance detecting mechanism 60, the cassette a is held at the center of the case body 1 for a predetermined time,
By lowering the cassette tray 56 to the initial position, the cassette a can be held at the lower end of the case body 1 for a predetermined time.

Reference numeral 70 denotes a left and right transfer device for the cassette a,
A drive pulley 71 and a driven pulley 72 are arranged at predetermined intervals on both left and right sides of the bottom of the case body, and a left and right transfer belt 73 is stretched between them. Reference numeral 74 denotes a left-right moving mechanism, which changes the rotation of a drive motor 75 by a gear head 76 and is linked to a drive gear 78 via a bevel gear 77. Thus, the drive gear 78 and the transmission gear 79 connected to the rear side of the drive pulley 71 are always meshed to rotate the drive pulley 71 so that the left and right transfer belt 73 can travel.

When the cassette tray 56 is in the initial position at the lowermost end, the upper and lower transfer belts 73 slightly protrude from the through holes 58 and run along the through holes 58. It is possible to do.

Numeral 80 denotes a horizontal moving distance detecting mechanism, which comprises a disk hub 81 having small holes provided at regular intervals around a disk and a photo sensor 82. The disk hub 81 is connected to the drive gear 78 by the drive gear 78. It is fixed to the rotating shaft of the interlocking gear 83 always meshed. Thus, the disk hub 81 is rotated with the rotation of the interlocking gear 83, the number of light beams passing through the small holes is counted by the photo sensor 82, and the detection signal is sent to the microcomputer control device 100, and the left and right transfer is performed. The moving distance of the belt 73 can be automatically adjusted.

Reference numeral 85 denotes a photosensor provided at an insertion opening in the case body, and a light emitting unit 8 is provided at the lower end of the case body.
6. At the upper end, a light receiving section 87 is arranged in a straight line to detect that a predetermined portion of the cassette has been inserted into the case body.

Reference numeral 90 denotes a cassette pressing device provided near the cassette insertion opening 2 in the case body, and a drive motor 94 for bridging the bottom of the pressing plate 91 having an L-shaped cross section between the pulleys 92 and 93. With the belt 95 moving up and down,
The pressing plate 91 can be moved up and down a predetermined distance along the guide rail 96. Thus, the pressing plate 91 is lowered according to the size of the inserted cassette a, and the right upper end surface of the cassette is pressed by the pressing piece 97 so as to prevent the cassette from dropping from the insertion slot 2. It is.

Next, the operation of the cassette positioning device will be described. When the cassette a is inserted into the case body from the insertion opening 2, the lower left end portion of the cassette a is placed on the cassette tray 56, and when the cassette a is further pushed, the cassette a is placed on the left and right transfer belt 73.
When the sensor 85 detects that the cassette has been inserted, the cassette pressing device 90 is operated to lower the pressing plate 91 by a predetermined distance, and the pressing piece 97 presses the upper end surface of the cassette to prevent the cassette from falling outside. .

The drive motor 75 of the left and right transfer device 70 is operated based on the signal of the sensor 85 to move the left and right transfer belt 73 to the left to transfer the cassette to the left. Thus, the moving distance detection mechanism 80 starts counting when the right end of the cassette enters the case body and passes the sensor line of the photo sensor 85, and the center of the cassette in the left-right direction is positioned at the center of the cassette tray 56. As soon as the cassette is moved, the drive motor 75 is stopped, so that the cassette is accurately positioned at the center of the case body 1 in the left-right direction. Immediately press plate 91
Returns to the initial position at the top end.

When the cassette is accurately positioned at the center in the left-right direction, the upper and lower transport belts 54 operate to raise the cassette tray 56.
When the spring plate 64 at the upper end of the switch is pressed, the micro switch 65 is activated to turn off the power of the drive motor 55 and stop it.

X-ray photography is performed while the examinee presses the body against the surface of the lid of the case body 1. The front of the inserted cassette is very close to the back of the lid 3. Therefore, a clear X-ray image can be obtained.

When the photographing is completed, the cassette is started to be ejected by the X-ray emission end signal. That is, when the upper and lower transfer belts 54 are operated to lower the cassette tray 56 to the initial position,
The upper surface of the left and right transfer belt 73 fits again into the through hole 58 of the cassette tray. Then, the drive motor 75 is operated to move the left and right transfer belt 73 to the right, and the cassette is stopped at a position where the right end of the cassette protrudes from the insertion port 2 by about 2 cm. Just take it out. The above series of operations can be automatically controlled by the microcomputer control device 100.

In the above case, the case where the cassette insertion opening 2 is provided on the right side of the case body 1 has been described, but it may be provided on the left side.

In the above example, the case where the cassette a is positioned at the center of the upper end of the case 1 has been described. However, after the center in the left-right direction is aligned with the center of the case, the moving distance detecting mechanism 60 detects the cassette a. If the tray 56 is lowered by half of the rising distance, the cassette can be accurately positioned at the center of the case body 1, and if the cassette tray 56 is lowered to the initial position, the cassette can be positioned at the center of the lower end of the case body 1. The positioning can be performed accurately, and may be set in advance according to the imaging region.

[0043]

Effects of the Invention] In the cassette automatic positioning device as set forth in claim 1, top center portion of the case body can be a cassette of the central portion and various sizes at each position of the lower center portion for positioning accurately and quickly. In addition, since the inserted cassette surface can be very close to the lid to which the examinee presses or approaches the body during imaging, a clear X-ray image can be obtained. Furthermore, since the insertion and discharge of the cassette can be performed automatically and in a short time, it is useful for labor saving in work.

In the automatic cassette positioning apparatus according to the second aspect, cassettes of various sizes can be accurately and quickly positioned at predetermined positions of the case body. Also, since the inserted cassette surface can be very close to the lid to which the examinee presses or approaches the body during imaging, a sharp X
A line image can be obtained. Further, there is an advantage that the cassette can be automatically inserted and discharged from the cassette in a short period of time, and since the configuration is relatively simple, manufacture is easy and the cassette can be provided at low cost.

Further, in the cassette automatic positioning device according to the third aspect, since the cassette can be reliably prevented from dropping during insertion, there is an advantage that the photographing operation can be performed with ease.

[Brief description of the drawings]

FIG. 1 is a front view of a cassette automatic positioning device.

FIG. 2 is a side view of the same.

FIG. 3 is a front view of a state in which a lid is removed.

FIG. 4 is a front view of a state where a lid and a middle plate are removed.

FIG. 5 is a sectional view taken along line AA in FIG. 4;

FIG. 6 is a sectional view taken along line BB in FIG. 4;

FIG. 7 is a front view of a cassette automatic positioning device according to another embodiment, with a lid and a middle plate removed.

FIG. 8 is a sectional view taken along line CC in FIG. 7;

9 is a sectional view of the cassette pressing device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case body 2 Insertion opening 7 Vertical transfer device 12 Vertical transfer belt 15 Cassette tray 16 Vertical movement distance detection mechanism 21 Left and right transfer device 23 Right and left and right movement truck 24 Left and right and left movement truck 27 Left and right movement mechanism 28 Drive pulley 30 Driven pulley 31 Left and right transfer Belt 32 Belt clamping device 33 Brake 35 Backing plate 36 Right pushing piece 37 Left pushing piece 42 Microcomputer controller 43 Middle plate 50 Vertical transport device 54 Vertical transport belt 56 Cassette tray 57 Horizontal section 58 Through hole 60 Vertical travel distance detection mechanism 70 Left and right transfer device 71 Drive pulley 72 Driven pulley 73 Left and right transfer belt 74 Left and right movement mechanism 78 Drive gear 79 Transmission gear 80 Left and right movement distance detection mechanism 83 Interlocking gear 85 Photo sensor 86 Light emitting unit 87 Light receiving unit 90 Cassette pressing device 91 Press plate 96 Guide Rail 97 pressing piece

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-141533 (JP, A) JP-A-58-4135 (JP, A) JP-A-4-331950 (JP, A) JP-A-9-99 269550 (JP, A) JP-A-10-282597 (JP, A) JP-A-1-128239 (JP, U) JP-A-5-96854 (JP, U) JP-A-6-4757 (JP, U) 6-64248 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 42/00-42/04

Claims (3)

(57) [Claims] 1. A case body, a cassette vertical transfer device and a left and right transfer device, wherein the case body has a cassette insertion port on one side thereof, and the vertical transfer device includes left and right side portions in the case body. An upper and lower transport belt having a length extending from the central portion to the lower portion is arranged side by side at a predetermined distance, and a cassette tray extending in the left-right direction is provided between the two transport belts. The drive shaft is provided with a mechanism for detecting the moving distance of the cassette tray, so that the cassette tray can be moved up and down a predetermined distance, and the left and right transfer device lays a guide rail on an upper portion in the case body. Then, at the end of the insertion opening side, a movable carriage provided with a belt clamping device capable of clamping a belt at the time of energization is mounted on the bottom of the pushing piece so as to be able to protrude and retract from the upper surface of the base plate. Opposite end In the part, a movable carriage having a pushing piece protruding from the upper surface of the base plate is mounted, and a left and right transfer belt is movably stretched between the left and right walls of the case body, and the bottom of the movable carriage on the insertion port side. Is formed detachably on the belt by the belt clamping device, and the bottom of the opposite movable carriage is fixed to the belt, and both movable carriages are moved inward as the left and right transport belts travel. Wherein the cassette can be transported to the center of the case body in the left-right direction. 2. A case body, comprising a vertically moving device for a cassette, a left and right moving device, and a cassette sensor. The case body has a cassette insertion opening on one side thereof, and the vertically moving device is provided with a left and right moving device inside the case body. On both sides, a vertical transfer belt of a length extending from the lower side to the substantially central portion is hangably traversed, and extends in the left-right direction, and a through-hole of a predetermined length in the longitudinal direction is formed in the cassette mounting portion. with the cassette tray which is provided for bridging between the two conveyor belts, the drive shaft of the upper and lower transport belts are provided with a vertical moving distance detecting mechanism of the cassette tray can be moved a predetermined distance cassette tray in a vertical direction The left and right transfer device is arranged such that a left and right transfer belt is mounted below the cassette mounting portion of the cassette tray so that the upper surface thereof slightly protrudes from the through hole and can run along the through hole. In addition to the transfer, the drive shaft of the left and right transfer belt is provided with a mechanism for detecting the moving distance of the cassette tray in the left and right direction so that the inserted cassette can be transferred to the center of the case body in the left and right direction by the left and right transfer belt. The cassette sensor includes a light emitting unit and a light receiving unit, and is provided at an insertion port in the case so as to detect that a predetermined portion of the cassette has been inserted into the case. Automatic cassette positioning device. 3. A cassette pressing device having a pressing plate which moves vertically by a predetermined distance along a guide rail is provided at a cassette insertion opening portion in a case body, and an upper end portion of the inserted cassette is moved by the pressing plate. 3. The automatic cassette positioning device according to claim 2, wherein the cassette is pressed to prevent the cassette from falling.