JPS6224777B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cassette holder for holding a cassette and transporting it to an imaging position and a fluoroscopy position in a cassette-type X-ray photographic apparatus.

There are various types of X-ray cassettes depending on the size of the cut film, such as 14 x 14'' (large square format), 10 x 12'' (quarter size), and 8 x 10'' (cabinet format). For this reason, conventionally, in order to ensure consistency between cassettes of different sizes, an auxiliary frame that matches the cassette size used has been used, and the cassettes have been loaded into the cassette holder via this auxiliary frame.
Therefore, in the conventional apparatus, it was necessary to load the cassette into the auxiliary frame, and this operation was cumbersome and inconvenient for continuous X-ray imaging.

For this reason, in the past, the
As described in the publication, the arms at both ends of the yoke, which is pivoted at the intermediate position of the cassette holder, are connected via links to each of a pair of parallel overhanging plates, and the arms are connected to the same axis on which the yoke is pivoted. A rotating arm is attached, the rotating arm and a yoke are connected by a first elastic member, and a second elastic member is attached to this yoke that acts on the yoke in the opposite direction to the rotational movement of the yoke by the rotating arm. A device has been developed in which the pair of overhanging plates are opened and closed by displacing the free end of the movable arm.

However, in this known device, the yoke and the rotating arm are pivoted on the same axis, and the yoke is pulled together by two elastic members (springs), so it is weak against the tension of both springs. It became essential to make adjustments so that there was no difference in the values, which caused problems in design, production, and use.

This invention provides a locking device for locking the rear end of the film cassette at the rear end of the cassette tray into which the film cassette is inserted and removed, a clamping frame that can be opened and closed on both left and right sides of the cassette tray, and In a cassette holder comprising an opening/closing means for opening and closing the clamping frame in response to insertion/removal operations of cassettes, the opening/closing means is disposed at symmetrical positions with respect to the left-right center line in the front-rear direction of the cassette tray. a pair of meshing gears having the same number of teeth and meshing with each other; a first link that is also arranged symmetrically with respect to the left-right center line and having one end fixed to the meshing gear; and this first link. a pair of link mechanisms comprising a second link, one end of which is rotatably engaged with the other end and the other end of which is pivotally connected to the clamping frame; It is pivoted to a fixed point on the cassette tray and is swingable in a plane that is parallel to the cassette tray surface and does not interfere with the insertion operation of the film cassette. A movable connector is provided at a swinging tip on the one end side, and one end is connected to a rear swinging end on the other end side of the pivot point of the movable connector, and the other end is connected to the rear swinging end on the other end side from the pivot point of the movable connector. The movable connector is connected to the first link of the link mechanism disposed on the opposite side of the fixing point, biases the holding frame to the open position at all times, and is movable as the film cassette is inserted. The present invention relates to a cassette holder characterized by comprising one coil spring that expands in response to the swinging motion of the cassette holder.

Hereinafter, a specific configuration of the present invention will be explained based on the drawings.

FIG. 1 is a plan view showing an example of a cassette holder according to the present invention, FIGS. c is an explanatory diagram illustrating the operation of the cassette holder. In these figures, the cassette tray 1 is moved from the preparation position L of the cassettes 2 to the imaging position R and to the perspective position F by an appropriate transport mechanism (not shown). Further, when loading the cassette 2 into the cassette tray 1, the rear end of the cassette 2 is loaded along the rear end of the cassette tray 1. Therefore, the center position of cassette 2 relative to cassette tray 1 will shift in the front-rear direction FB every time the cassette size changes, but in this case, by changing the feed amount of cassette tray 1, the center of cassette 2 and the Perform alignment with center X.

The cassette tray 1 has a size sufficient to load the largest sized cassettes, and a guide shaft 3 is installed on the front edge of the tray in the left-right direction LR, and a pair of clamping frames 4 are installed oppositely on the left and right. , 5 are pivotally supported so as to be movable in the left and right direction.

The left and right holding frames 4 and 5 hold the cassette 2 to be inserted.
Its front support parts 4' and 5' are slidably attached to the guide shaft 3. Further, the clamping frames 4 and 5 are connected to a coupling device 6 that moves symmetrically at their front support parts 4' and 5', so that the left and right clamping frames 4 and 5 are held at symmetrical positions with respect to the center of the cassette tray 1. It is made to move symmetrically in the left and right direction LR. Therefore, the horizontal center of the cassette 2 held between the holding frames 4 and 5 is aligned with the horizontal center of the cassette tray 1. Furthermore, when the cassette tray 1 is at the loading position L, the holding frames 4 and 5 are opened left and right so that the cassette 2 can be inserted therein.

Connector 6 for symmetrical movement of left and right clamping frames 4 and 5
In this embodiment, a pair of meshing gears 7 and 8 with the same number of teeth are provided at symmetrical positions with respect to the center of the cassette tray 1, and
Link mechanisms 9 and 1 are fixed to the gears 7 and 8 and rotate along the cassette tray 1 while being held in a symmetrical position with respect to the center of the cassette tray 1.
A symmetrical motion mechanism consisting of 0 is used. That is, when the left link 9 rotates counterclockwise, the right link 10 rotates clockwise by an equal rotation angle via the meshing gears 7 and 8, and the left-right displacement of both links 9 and 10 at this time is It is transmitted to the clamping frames 4 and 5 via the left and right links 11 and 12, causing both to move symmetrically.

The clamping frames 4 and 5 are driven in the direction of clamping the cassette 2 by a movable connector 13 that is displaced in response to the insertion of the cassette 2, and when the loaded cassette 2 is removed, the clamping frames 4 and 5 are moved to the open position. It is designed to be driven in conjunction with the insertion of the cassette 2 via a spring 14 that biases the clamping frames 4 and 5, and the connector 13 that moves the clamping frames 4 and 5 symmetrically.

This movable connector 13 is attached to a fixed point 16 on the cassette tray, and its swinging tip 1
3' is composed of a rotating lever that rotates in contact with the front end of the cassette 2 into which the cassette 2 is inserted. Further, the spring 14 is a close coil spring, which is stretched between the rear swinging end 15 of the movable connector 13 and the left link 9 of the connector 6.

The left and right holding frames 4 and 5 operate as follows in conjunction with the insertion of the cassette 2. Now, as shown in FIG. 3a, when the cassette 2 is inserted into the cassette tray 1, the movable connector 13 is pushed by the front end of the cassette 2 and rotates clockwise. At this time, the spring 14 is pulled in the direction of the arrow in response to the rotation of the movable connector 13. In addition, the left link 9 of the connector 6 which is caused to move symmetrically is also rotated counterclockwise, and as a result, the left and right clamping frames 4 and 5 are driven in the direction of clamping the cassette 2. In this case, the contact coil spring 14 is urged in the direction of contraction with an appropriate pressure, so that it is prevented from expanding until the clamping frames 4 and 5 clamp the cassette 2. And clamping frames 4 and 5
After the cassette 2 is clamped, the end of the close coil spring 14 connected to the link 9 is held in an immovable state, and after that, the close coil spring 14 expands in response to the insertion of the cassette 2, increasing its traction force. Go.

As a result, the left and right clamping frames 4 and 5 increase their clamping force against the cassette 2, and the movable connector 13 also increases the repulsive force that urges the cassette 2 backward.

A locking tool 19 is provided at the tip of one or both of the clamping frames 4, 5 to releasably restrain the loaded cassette 2 from jumping out rearward. In this embodiment, this locking tool 19 is
The cassette tray 1 is configured as a leaf spring with a protruding piece slightly projecting inward along its front edge. Therefore, when the left and right clamping frames 4 and 5 clamp the cassette 2 while the cassette is being inserted,
As shown in FIG. 3b, the locking device 19 is retracted outwardly.

In addition, in this embodiment, the movable connector 13
The rotating shaft of the movable connector 13 is attached to the fixed point 16, which is provided on the upper cover of the cassette tray 1 (only a portion of which is shown) to prevent interference between the cassettes 2 to be inserted and the movable connector 13. ing.
Further, a rotating roller 1 is provided at the swinging tip 13'.
8 to ensure smooth contact with the front end of the cassette 2.

The close coil spring 14 is applied with a pressurizing force in the direction of contraction, and in a relaxed state, each coil is in close contact with each other to prevent it from buckling in the lateral direction. Therefore, when taking out the loaded cassette 2 again, the tight coil spring 14
transmits the rotational force of the movable connector 13 in the counterclockwise direction at that time to the left link 9 of the connector 6 to return the left and right clamping frames 4, 5 to their original open positions. As a result, the left and right clamping frames 4 and 5 are
In the preparation position of the cassette 2, the cassette 2 is always opened left and right to facilitate the subsequent insertion of the cassette 2.

Although one embodiment has been described above, it is clear that various modified embodiments can be considered within the scope of the invention.

As explained above, the present invention provides a cassette holder that can fix a cassette at a predetermined position on a cassette tray by simply inserting the cassette, regardless of the size of the cassette. It can be configured without any adjustment, and the left and right gripping frames can be opened and closed simultaneously by a pair of meshing gears arranged symmetrically with respect to the left and right center line and a pair of link mechanisms fixed to each gear. As a result, the left and right gripping frames can move accurately and smoothly symmetrically with respect to the left and right center line. Therefore, by simply inserting the cassette, the cassette can be automatically fixed at the center of the cassette tray without the need for lateral alignment.
Furthermore, since the inserted cassette is always urged rearward by the action of the spring, the inserted cassette can be easily taken out rearward simply by releasing its restraint.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a cassette holder according to the present invention, and FIG. 2 is a plan view showing the conveyance position of the cassette holder in an X-ray copying apparatus.
FIG. 3 is an explanatory diagram showing the operation of this cassette holder. 1... Cassette tray, 2... Film cassette (cassette), 4, 5... Clamping frame, 6... Connector, 13... Movable connector, 14... Spring (close coil spring), 16... Fixed point , 19...Lock.

Claims (1)

[Claims] 1. A locking device for locking the rear end of the film cassette is provided at the rear end of the cassette tray into which the film cassette is inserted and removed, a clamping frame that can be opened and closed is installed on both left and right sides of the cassette tray, and In a cassette holder comprising an opening/closing moving means for opening/closing the holding frame in response to an insertion/removal operation, the opening/closing moving means are arranged at symmetrical positions with respect to the left-right center line in the front-rear direction of the cassette tray, and are spaced apart from each other. A pair of meshing gears having the same number of meshed teeth, a first link that is also arranged symmetrically with respect to the left-right center line, and one end of which is fixed to the meshing gear, and the other end of this first link. a pair of link mechanisms comprising a second link, one end of which is rotatably engaged with the holding frame, and the other end of which is pivotally connected to the holding frame; It is pivoted to a fixed point and is swingable in a plane that is parallel to the cassette tray surface and does not interfere with the insertion operation of the film cassette. one end is connected to the rear swinging end on the other end side of the pivot point of the movable connector, and the other end is connected to the fixed point with respect to the left-right center line. the first link mechanism disposed on the opposite side of the arrangement position;
and a single coil spring connected to the link to always urge the holding frame to the open position and to expand in response to the swinging movement of the movable connector as the film cassette is inserted. A cassette holder featuring: