JPH0560089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a radiation absorbing device in which the imaging position for irradiating radiation onto an unexposed sheet-like recording medium, such as an X-ray photographic film or a stimulable phosphor sheet, is variable. Regarding the image shooting stand.

(Prior Art) In the simplest conventional standing radiographic imaging table, an operator places the sheet-like recording medium on an imaging table unit that is movable in the vertical direction and can be positioned at a desired height. After setting a holder such as a cassette or magazine, set the photographing platform unit at a desired height position and take a picture. After photographing, remove the holder from the photographing base and place the photographed recording medium on the holder. Instead, an unexposed sheet-like recording medium is loaded again and the next photographing is performed. Such a photographing stand is unsuitable for continuous photographing because it is necessary to manually load and unload the recording medium into the photographing stand unit.

As a radiographic imaging platform suitable for continuous imaging, a transport path is provided with a pair of fixed transport means fixedly arranged at a distance from each other, and a movable imaging stage unit is provided between the pair of fixed transport means. , the unexposed recording medium is conveyed to the photographing table unit via one of the pair of fixed conveying means, and the exposed recording medium photographed by the photographing table unit is transferred to the pair of fixed conveying means. It is conceivable to discharge the liquid to the other one of the fixed conveying means. In this case, a first conveying means is provided at the entrance of the photographing table unit in order to ensure that the recording medium sent from the one fixed conveying means is taken into the photographing table unit, and a first conveying means is provided at the entrance of the photographing table unit. A second transport means is provided at the exit for discharging the exposed recording medium to the other fixed transport means.

According to the continuous radiographic imaging table described above,
The recording medium is automatically conveyed via one of the fixed conveying means to the photographing table unit which is movable between the pair of fixed conveying means, and the photographed recording medium is transferred from the photographing table unit to the photographing table unit which is movable between the pair of fixed conveying means. It can be automatically discharged to the other fixed conveyance means, thereby making it possible to automate continuous photographing.

However, when transporting the recording medium from the one fixed transport means to the photographing stand unit and from the photographing stand unit to the other fixed transport means, it is necessary to ensure this transport and prevent damage to the recording medium. In order to achieve this, it is desirable that the recording medium is conveyed while being held by either the pair of fixed conveyance means or the first conveyance means or second conveyance means of the photographing platform unit. For this purpose, in the continuous radiography radiographic imaging platform, the movement range of the imaging platform unit is determined by adjusting the distance between the one fixed conveyance means and the first conveyance means and the distance between the second conveyance means and the other fixed conveyance means. Since it is necessary to set the distance between the photographing stage unit and the means so that it is always smaller than the length dimension of the recording medium, the stroke of the photographing platform unit cannot be set to exceed the length dimension of the recording medium. First, there is a drawback that the imaging platform unit cannot be moved to a corresponding imaging position depending on the part to be imaged.

(Objective) Therefore, an object of the present invention is to enable reliable conveyance of a sheet-like recording medium, and to move a photographing table unit provided between a pair of fixed conveyance means to an arbitrary position for photographing. An object of the present invention is to provide a radiographic imaging table whose position can be selected.

(Structure and Effects) The present invention basically includes a pair of fixed conveying means fixedly arranged at intervals, and a reciprocating movement between the pair of fixed conveying means. an entrance for receiving a sheet-shaped recording medium sent by one of the pair of fixed conveyance means, and a fixed conveyance of the other of the pair of fixed conveyance means, which are movably arranged; a first conveying means for taking in the sheet-like recording medium into the inlet; and a first conveying means for taking the sheet-like recording medium into the inlet; A photographing platform unit provided with a second conveying means is arranged at each of the entrance and exit sides of the photographing table unit with the photographing table unit sandwiched therebetween, and the photographing table unit is arranged between the pair of fixed conveying means. at least a pair of relay conveying means movable in the moving direction of the platform unit and integrally movably connected to each other, each of the first conveying means and the second conveying means; means and second
and the maximum distance between each of the pair of fixed conveyance means and the pair of relay conveyance means adjacent to each of the pair of fixed conveyance means; are each set to be equal to or less than the length dimension of the recording medium.

In the photographing table according to the present invention, at least one pair of relay conveying means arranged to sandwich the photographing table unit and integrally movably connected to each other do not prevent the photographing table unit from moving. and the relay conveying means provided on the entrance side reliably sends the recording medium from the one fixed conveying means to the first conveying means provided at the entrance of the photographing platform unit, The relay transport means provided on the exit side reliably transports the recording medium from the second transport means provided at the exit of the imaging platform unit to the other fixed transport means.

Therefore, according to the present invention, the recording medium is transferred from the one fixed conveyance means to the photographing stand unit;
Further, the photographing table unit can be moved to any position between the pair of fixed conveying means without leaving the recording medium in a non-holding state when conveying from the photographing table unit to the other fixed conveying means. This allows you to select any shooting position.

Furthermore, the present invention provides the pair of fixed conveyance means,
At least one pair of relay conveyance means, a first conveyance means, and a second conveyance means each include a driving means for driving each of the conveyance means, and each of the conveyance means has at least one pair of rollers, and each of the conveyance means has at least one pair of rollers. At least one of the rollers has an engaging portion that engages with the driving means to transmit a driving force from the driving means for conveying the sheet-like recording medium between the rollers by the cooperation of the pair of rollers. The driving means includes at least one endless drive transmission member stretched across each of the engaging portions provided on the rollers constituting each of the conveying means, It is characterized in that the outer diameter of the engaging means and the outer diameter of each of the rollers on which the engaging portions are provided are approximately equal.

In the photographing platform according to the present invention, for example, when the recording medium is conveyed from the one fixed conveyance means to the first conveyance means via the relay conveyance means, the recording medium is When the photographing platform is being transported while being simultaneously held by the rollers of the conveyance means and the relay conveyance means, or while being conveyed while being simultaneously held by the rollers of the relay conveyance means and the first conveyance means. Even if the unit is moved and the relay conveyance means is moved in accordance with the movement of the imaging platform unit, the recording medium is not moved by the rollers of the pair of fixed conveyance means and the first conveyance means when viewed from a stationary system. The transport speeds will be equal.

Therefore, according to the present invention, even if the photographing table unit is moved for position adjustment while the recording medium is being conveyed, the recording medium is not pulled by the movement of the photographing table unit. Since the recording medium is not subjected to tension and is not deflected, the recording medium is not damaged even during transportation between the pair of fixed conveyance means. The position of the photographing stand unit can be adjusted.

In the present invention, as the endless drive transmission member, a power transmission member such as a chain or a timing belt can be used, for example. In addition, the drive transmission member engages with the engagement portion provided on the roller to transmit the driving force. For example, if the drive transmission member is a chain, the chain sprocket,
In the case of a timing belt, a timing gear is used.

Further, in the present invention, the outer diameter of the engaging portion specifically means the pitch circle diameter.

Before explaining the embodiments of the present invention, the first
The basic configuration of the present invention will be explained with reference to the drawings.

In FIG. 1, a pair of fixed conveyance means 2, 2a, 2
b, a first conveyance means 6a and a second conveyance means 6 provided at the entrance and exit of the photographing platform unit 4;
b and each relay conveyance means 8, 8a ₁ , 8a ₂ , 8b ₁ ,
8b ₂ comprises a pair of rollers rotatable about their respective longitudinal axes. At least one of each pair of rollers is driven and rotated to convey the sheet-like recording medium between each pair of rollers.
The pair of fixed conveyance means 2a and 2b are arranged at a distance L that is sufficiently larger than the length dimension S, in order to give a stroke so that various parts can be photographed to the photographing table unit 4, which is movably arranged between them. It is fixedly located at As shown in the figure, each of the conveying means 2a, 2b, 6a, 6b, 8a ₁ , 8a ₂ , 8
When b ₁ and 8b ₂ include rollers, the distance between each conveying means refers to the distance between the rotational axes of the rollers between each conveying means. The first conveying means 6a and the second conveying means 6b of the photographing platform unit 4 house a holder (indicated by number 20 in FIG. 2) provided between them for holding the recording medium. Therefore, they are arranged at intervals of a value l larger than the length dimension of the recording medium.

In the illustrated example, the photographing platform unit 4 is movable in the vertical direction between the fixed transport means 2a and 2b,
The upper and lower ends of the photographing table unit 4, that is, between the photographing table unit and each fixed conveyance means 2a, 2b,
Two sets of relay conveyance means 8a ₁ , 8a ₂ , 8b ₁ ,
8b ₂ is provided to be movable in the vertical direction, and the upper and lower relay conveyance means 8a ₁ and 8b ₁ , 8a ₂ and 8b ₂ , which are located in the order of proximity when viewed from the imaging platform unit 4, form pairs, respectively. They are connected at intervals L ₁ and L ₂ so that they can move up and down as one. In addition, in FIG. 1, the photographing stand unit is moved to the upper end, and the fixed conveyance means 2a and the relay conveyance means 8 are moved to the upper end.
a ₂ , 8a ₁ and the first conveyance means 6a are shown in a state where they are closest to each other, and the distance (nearest distance) between the fixed conveyance means 2a and the relay conveyance means 8a ₂ in this state is m ₃ , The distance between relay conveyance means 8a ₂ and 8a ₁ is
_m2 , and the distance between the relay conveyance means _8a1 and the first conveyance means 6a is _m3 .

Therefore, the recording medium is
a. In order for the recording medium to be always held by at least one of the conveyance means when being conveyed via the relay conveyance means 8a, the photographing platform unit 4, the relay conveyance means 8b and the fixed conveyance means 2b, the above-mentioned Each of the mutually adjacent conveying means (the first conveying means 6a
and the second conveying means 6b, and the maximum interval (excluding this) may be set not to exceed the length dimension S of the recording medium.

Therefore, in the example of FIG. 1, the distance L between the fixed conveyance means 2a and 2b, the distance L ₁ and L ₂ between the relay conveyance means, and the first conveyance means 6a.
The following equation holds true between the distance l between and the second conveying means 6b, the length S of the recording medium, and the closest distances m ₁ , m ₂ and m ₃ .

L ₁ − (l + m ₁ ) < S ... (1) L ₂ - (L ₁ + m ₂ ) < S ... (2) L - (L ₂ + m ₃ ) < S ... (3) Next, in general, the above A method of determining the required number of relay conveyance means and the interval between the connected pairs of relay conveyance means to be able to convey the recording medium in a constantly held state will be explained. First, to simplify the explanation, it is assumed that the closest distance between each conveying means is a constant value m.

The number of required relay conveyance means is fixed conveyance means 2a.
and 2b, the first conveying means 6a and the second conveying means 6a
The dimension (L
-l), it is determined by how many dimensions (S+m), which is the sum of the length dimension S of the recording medium and the nearest distance m, can be obtained. In other words, the number of relay conveyance means greater than or equal to the integer part of the quotient of (L-l)/(S+m) is required.

Further, the distance Ln between the relay conveyance means connected to each other to form a pair is selected so as to satisfy the following formula Ln-Ln _-1 -m<S (4). Here, Ln and Ln _-1 are the distances between the nth and n -1st relay conveyance means, respectively, as viewed from the photographing stand unit 4, and L0 is the interval between the relay conveyance means located at the n-th and n _- 1st positions, respectively, when viewed from the photographing stand unit 4, and _L0 is the interval between the relay conveyance means located at the n-th and This is the distance l between the first conveying means 6a and the second conveying means 6b.

As a result, in the case where one relay conveyance means is provided between the fixed conveyance means and the photographing platform unit, each relay conveyance means and the adjacent one, regardless of the moving position of the photographing table unit, The maximum distance between the fixed conveying means and the photographing platform unit and the first conveying means or the second conveying means may be less than or equal to the length dimension S of the recording medium. When a plurality of relay conveyance means are provided between the recording medium and the recording medium, the maximum interval between adjacent relay conveyance means can also be set to be equal to or less than the length dimension S of the recording medium. It goes without saying that the closest distances between the respective transport means can be set individually without making them constant. In this case, the following formula generally holds.

L-l<〓(m+nS)...(5) In this case, by finding n that satisfies equation (5), you can obtain the number of required relay conveyance means, but specifically, the value of m is = 1, then select appropriate values (5)
What is necessary is to find the value of n that makes the formula hold true.

(Embodiments) The features of the present invention will become clearer from the following description of the illustrated embodiments.

As shown in FIG. 2, the photographing stand 10 according to the present invention includes a housing 12 that is L-shaped as a whole and has a horizontal bottom portion 12a and an upright portion 12b rising vertically from one side of the horizontal bottom portion. The upright portion 12b includes a photographing stand unit 16 disposed movably in the vertical direction within an elongated opening 14 extending in the vertical direction provided on the front surface of the upright portion 12b. The length of the opening 14 is large enough to allow the imaging platform unit 16 to move vertically with a stroke that exceeds the length of a sheet-like recording medium (not shown). In order to close the upper and lower portions of the photographing table unit 16 in the opening 14, the free ends of self-rolling blinds 18a and 18b arranged above and below the photographing table unit 16 close the upper end of the photographing table unit 16. and the lower end, respectively.

A holder 20 for accommodating the recording medium to be sent to the photographing stand unit 16 is disposed within the photographing stand unit 16. In the illustrated example, the holder 20 is a first plate member made of a material such as a synthetic resin with a low X-ray absorption rate and whose upper end is swingably supported on the photographing table unit main body 16a via a pivot shaft 22. 24, and the photographing stand unit main body 1
A second plate member 28 is supported by the photographing stand unit main body 16a via a shaft portion 28a that is received in an arcuate guide groove 26 provided on both sides of the photographing table unit body 16a. Both plate members 24 and 28 are interconnected via a pivot 32 to define a gap 30 between their lower ends for allowing passage of the recording medium. A lid member 34 for opening and closing the gap 30 is pivotally attached to the shaft portion 28a. Lid member 3
4 receives a spring force from a spring 36 toward a position where the gap 30 is closed.

The shaft portion 28a is caused to reciprocate along the guide groove 26 between one end 26a and the other end 26b of the guide groove by using, for example, a crank device (not shown). When the shaft portion 28a is further moved toward the other end 26b from the position shown in FIG. 2, the lid member 34 is provided with a fulcrum by a stopper 38 provided on the photographing table unit main body 16a.
The gap 30 is opened by swinging around the fulcrum. When the shaft portion 28a is in the position shown in FIG. 2 and closer to the one end 26a of the guide groove 26 than the position shown in FIG. 2, the gap 30 is closed by the cover member 34. When the holder 20 receives the recording medium in the attitude shown in FIG. While being sandwiched between the members 24 and 28, the recording medium is held in a photographing position indicated by the symbol A, which is close to and parallel to the front surface of the photographing stage unit 16. Further, when the recording medium is irradiated with X-rays, the shaft portion 28a is then moved toward the other end 26b of the guide groove 26, so that the holder 20 can move the irradiated recording medium to the Discharge after interval 30.

When the recording medium sent to the photographing table unit 16 is irradiated with radiation such as X-rays, α-rays, β-rays, or ultraviolet rays, it stores and records a portion of this radiation internally as image information, and then This is a stimulable phosphor sheet that exhibits stimulated luminescence according to a radiation image accumulated by being irradiated with excitation light such as visible light.

Near the upper edge of the opening 14, a first fixed conveying means 2a for feeding the sheet to the photographing table unit 16 is provided, and near the lower edge of the opening 14, a photographing table unit 2a is provided. a second fixed conveyance means 2 for receiving the sheet on which a radiation image has been accumulated and recorded by being irradiated with X-rays in step 16;
b is provided. The sheet on which the radiation image has been accumulated and recorded is sent to an image reading section 46 via a belt conveying device 40 provided in association with the second fixed conveying means 2b, and belt conveying devices 42 and 44 following the belt conveying device. . The sheet is exposed to excitation light 4 from an excitation light source in an image reading section 46.
8 scans and exhibits stimulated luminescence according to the accumulated radiation image information. This stimulated luminescence light is converted into an electrical signal for obtaining an image by a photoelectric reading device 50 such as a photomultiplier tube, and this electrical signal is displayed on an image display device such as a CTR, for example.
Alternatively, it is used to reproduce a visible image on a recording medium such as photographic film. The sheet, on which the radiation image information has been read by the image reading unit,
Belt conveyance devices 52, 54 and conveyance rollers 56
The sheet is then sent to the erasing section 58, where the remaining radiation energy is released by light irradiation, heating, etc., and the sheet is returned to a reusable state. This sheet is sent via a conveyance roller 60 to a belt conveyance layer device 62 provided in association with the first stationary conveyance means 2a, and again via the first stationary conveyance means 2a to the photographing platform unit 16. sent to.

Refer to FIGS. 3 and 4 for details regarding the structure related to the conveyance path in which the sheet passes from the first fixed conveyance means 2a to the photographing platform unit 16 to the second fixed conveyance means 2b. I will explain.

A pair of upright internal members 64 are laterally spaced from each other and extend vertically along opposite sides of the opening 14 within the housing 12 and are connected to the first and second stationary conveying means. 2a, 2
b are arranged across the guide members 64 at the upper and lower parts of the guide members so as to be spaced apart from each other in the vertical direction.

The photographing table unit 16 disposed between both the fixed conveyance means 2a and 2b has a unit main body 16a.
Through a pair of engaging portions 66 provided at both ends of the
It is slidably engaged with the guide member 64 and can reciprocate in the vertical direction between both fixed conveying means 2a and 2b through a stroke exceeding the length of the sheet. A drive device 72, such as an electric motor, is secured via a bracket 70 to an upper frame member 68a disposed across the pair of upright internal members 64 and secured to the top of the guide members. A male threaded member 74 is fixed to the output shaft 72a of the motor 72 in series with the drive shaft. The male screw member 74 vertically passes through the photographing table unit 16 and is screwed into a female screw member 76 fixed to the top of the photographing table unit. Therefore, by controlling the operation of the drive device 72, it is possible to move the imaging platform unit 16 to a desired height position between the fixed conveyance means 2a and 2b and to position it at the desired height position. can.

At an entrance 78a (see FIG. 3), which is an opening at the upper end of the photographing platform unit 16, there is a first conveying means 6a for receiving the sheet sent toward the entrance and conveying the sheet to the holder 20. is provided at the output 78b (see FIG. 3), which is the lower end opening of the photographing platform unit 16, for discharging the sheet released from the holder 20 toward the second fixed conveyance means 2b. A second transport means 6b is provided. Further, in the illustrated example, between the holder 20 and the second conveying means 6b, there is provided an auxiliary conveying means for directing the sheet discharged from the gap 30 of the holder 20 toward the second conveying means 6b. Three conveyance means 6c are provided.

When the photographing platform unit 16 moves to a position close to either the first or second fixed transport means 2a, 2b, the fixed transport means 2b, 2a located on the opposite side and the fixed transport means A gap exceeding the length of the sheet is created between the adjacent first or second conveying means 6b, 6a, making it difficult to convey the sheet smoothly. In order to prevent this, relay conveyance means 8a and 8b are provided between the fixed conveyance means 2a and 2b, which are respectively disposed on the entrance 78a and exit 78b sides of the photographing unit 16.

In the illustrated example, each fixed conveyance means 2a, 2b, each conveyance means 6a, 6b, 6c, and each relay conveyance means 8a, 8b are each provided with a pair of rollers 80. Each roller 80 has a roller main body 80b having a uniform outer diameter along its shaft portion 80a, the outer diameter of each roller main body 80b is approximately equal, and the length dimension of each roller main body 80b is That is, it is smaller than the width dimension of the sheet. A pair of pulleys 82 having an outer diameter smaller than the outer diameter of the roller body 80b are arranged on the shaft portion 80a of each roller 80 except one roller of the third conveying means 6c on both sides of the roller body 80b. has been done. A pair of pulleys 82 of each roller 80 are supported by the shaft portion so as to be rotatable with respect to the roller main body 80b with an interval smaller than the width of the sheet. Further, each of the transport means 2a, 2b, 6
A sprocket 84, which is an engaging portion, is fixed to one end of the shaft portion 80a of one of the rollers 80 in a, 6b, 6c, 8a, and 8b. approximately equal to the outer diameter of

The shaft portion 80a of each roller 80 of the first fixed conveyance means 2a is supported by the upper frame member 68a via an upper bracket 86a, and the shaft portion 80a of each roller 80 of the second fixed conveyance means 2b is supported by the upper frame member 68a via an upper bracket 86a.
is supported on the lower frame member 68b via a lower bracket 86b. Further, the shaft portions 80a of the rollers 80 of the first to third conveying means 6a to 6c are arranged on both sides of the photographing table unit main body 16a so that the sprocket 84 is located outside the photographing table unit 16. Supported.

For each relay conveyance means 8a and 8b, one support member 88a and 88b is provided above and below the photographing platform unit 16, respectively, and is guided in the vertical direction by the pair of straight inner members 64. There is. The upper support member 88a supports each shaft portion 80a of the pair of rollers 80 of the upper relay conveyance means 8a, and the lower support member 88b supports each shaft portion 80a of the pair of rollers 80 of the lower relay conveyance means 8b.
is supported. Both support members 88a and 88
b are mutually connected via a connecting member 90, whereby both relay conveyance means 8a and 8b
are movable integrally with each other in the vertical direction.

the photographing table unit 16 or first and second conveying means 6a provided on the photographing table unit;
6b and the relay conveyance means 8a, 8b, spacers 92 are provided on the upper and lower surfaces of the imaging platform unit 16, respectively, so that they can abut on the upper support member 88a and the lower support member 88b. In order to prevent interference between each fixed conveyance means 2a, 2b and relay conveyance means 8a, 8b,
An upper support member 88 is provided on the lower surface of the upper bracket 86a and the upper surface of the lower bracket 86b, respectively.
A spacer 94 is provided that can come into contact with the lower support member 88b and the lower support member 88b.

When the photographing table unit 16 is moved upward by the operation of the driving device 72, when the spacer 92 of the photographing table unit 16 comes into contact with the support member 88a, both relay conveying means 8a and 8b move the photographing table unit 16 upwardly. It is advanced to the base unit 16. The connecting member 90 connects both relay conveyance means 8a and 8b.
When the photographing platform unit 16 is closest to one of the fixed conveyance means 2a or 2b, the length dimension of the intermediate conveyance means 2b or 8a adjacent to the other fixed conveyance means 2b or 2a is
and the distance between the relay conveyance means and the conveyance means 6b or 6a adjacent to the relay conveyance means are set to be equal to or less than the length of the sheet. Therefore, regardless of the height position of the photographing platform unit 16, the interval between adjacent conveying means is variable, that is, the interval between adjacent conveying means is variable.
The distance between the fixed conveyance means 2a and the relay conveyance means 8a,
an interval between the relay conveyance means and the first conveyance means 6a;
The distance between the second conveyance means 6b and the relay conveyance means 8b, and the distance between the relay conveyance means and the fixed conveyance means 2b are always equal to or less than the length of the sheet.

Shaft portion 80 of one roller 80 of each of the conveying means
A chain 96, which is an endless drive transmission member, is arranged around each sprocket 84 provided at the sprocket 84. As shown in FIG. 4, in order to ensure that the chain 96 engages with the sprocket 84 of the auxiliary conveying means 6c, which is located at a position deviated from the linear sprocket row, the path of the chain is changed. Idling sprocket 8 for partial change
4' is provided. An output shaft 98a of a drive device 98, such as an electric motor, is coaxially coupled to the shaft portion 80a of one of the rollers 80 of the fixed conveyance means 2b. The rotational force of the drive device 98 is applied to the pair of rollers 80 of each conveying means via the chain.
can be conveyed to one side. As a result, the pair of rollers of each conveying means are rotated so as to convey the recording medium downward in the figure through mutual cooperation.

A pair of belt-shaped guide members 100 that engage with the pulley 82 are arranged on both sides of the roller body 80b of each roller 80, respectively. Guide member 1
00 is made of a flexible, narrow belt member, for example, and is clearly shown in FIG. 4 in order to restrain movement of the sheet conveyed between the pair of rollers 80 in the sheet thickness direction. As shown in FIG.
A pair of rollers 80 b, 6a, 6b, 8a, 8b
A pair of pulleys 82 are engaged with the corresponding pulleys so as to extend between the pair of pulleys 82. The upper ends of each pair of guide members 100 provided on both sides of the roller body 80b are respectively fixed to the upper frame member 68a such that the distance between them gradually increases toward the tip thereof, and Each lower end of the pair of guide members 100 is connected to a lower frame member 6 such that the distance between them gradually increases toward the tip thereof.
8b, respectively, through spring members 102 for applying tension.

Referring to FIG. 4, each pair of guide members 1 are provided on both sides of the roller body 80b.
One of the guide members 100a of 00 does not engage with the one roller 80 of the auxiliary conveyance means 6c, and the other guide member 100b does not engage with the other roller 80 of the auxiliary conveyance means 6c. The pulley 82 is engaged with the pulley 82 . Both guide members 10
0, 100a, and 100b are spaced apart from each other by a guide member, that is, a plurality of idle pulleys 104, between the two transport means 6a and 6b to prevent interference with the holder 20 disposed between the two transport means. has been increased.

In the photographing table 10, each of the transport means 2a, 2b, 6a, 6b, 6c, 8a,
When the rollers 80 of 8b are driven simultaneously, the unexposed or recycled sheet sent between both rollers 80 of the upper fixed conveyance means 2a is transferred between both rollers 80 of the upper relay conveyance means 8a. The first transport means 6a provided at the entrance 78a of the imaging platform unit 16 at a desired height position
The image is sent between both rollers 80 and taken into the photographing table unit 16 by these rollers.

When conveying the sheet from the upper fixed conveying means 2a to the photographing table unit 16, as described above, regardless of the height position of the photographing table unit 16, the upper relay conveying means 8a, the upper fixed conveying means 2a and The distance from the first conveyance means 6a always does not exceed the length of the sheet. Therefore, since the sheet is held by at least one of the upper fixed conveyance means 2a, the upper intermediate conveyance means 8a, and the first conveyance means 6a, it is sent to the subsequent conveyance means. The sheet is not damaged by free fall during this transport.

The sheet that has passed through the first conveyance means 6a is
As described above, when the sheet is irradiated with X-rays for photographing while being held in the holder 20, the sheet passes through the gap 30 of the holder 20 and is ejected between both rollers 80 of the auxiliary conveying means 6c. , from the auxiliary conveying means to between both rollers 80 of the second conveying means 6b. Said second conveyance means 6
The sheet sent to point b is ejected from the photographing table unit 16 through the outlet 78b, passes between both rollers 80 of the lower relay conveying means 8b, and is sent to between the two rollers 80 of the lower fixed conveying means 2b.

When conveying the sheet from the photographing platform unit 16 to the lower fixed conveying means 2b, as described above, regardless of the height position of the photographing table unit 16, the lower intermediate conveying means 8b and the lower fixed conveying means 2b
And the distance from the second conveyance means 6b always does not exceed the length dimension of the sheet. Therefore,
Since the sheet is held by at least one of the second conveying means 6b, the lower intermediate conveying means 8b, and the lower fixed conveying means 2b, and is sent to the subsequent conveying means, the sheet is No damage is caused by free fall during this transport.

Therefore, when the sheet is transported through the photographing platform unit 16, it is possible to reliably transport the sheet without damaging the sheet, and
The height position of the photographing table unit can be freely selected between the pair of fixed conveyance means, thereby making it possible to move the photographing table unit to a photographing position according to the part to be photographed.

Further, since the outer diameter of each roller 80, that is, the outer diameter of the roller body 80a, is approximately equal, and the pitch circle diameter of the sprocket 84, which is the engaging portion of the roller 80, is approximately equal to the outer diameter of the roller body 80a, for example, , the sheet is placed on the upper fixed conveyance means 2a.
When the sheet is conveyed from the top through the upper relay conveying means 8a to the first conveying means 6a, the sheet is simultaneously held by each roller 80 of at least two of these three conveying means. Even if the photographing table unit is moved while the sheet is being transported, and even if the relay conveying means moves in accordance with the movement of the photographing table unit, the conveyance of the sheet by the rollers 80 of each conveying means as seen from a stationary system will not continue. The speeds will be equal. Therefore, even if the photographing table unit is moved to adjust the height while the sheet is being conveyed, the pulling force between the conveying means is applied to the sheet due to the movement of the photographing table unit. There is no action and no deflection is applied to the recording medium. Therefore, even while the sheet is being conveyed between the fixed conveyance means, the position of the photographing stand unit can be adjusted without damaging the sheet. In this embodiment, the outer diameters of each roller 80 are approximately the same, but if the outer diameter of each roller and the pitch circle diameter of the engaging portion of the roller are equal, the outer diameters of the rollers may differ. It's good to wear.

Next, the relationship between the outer diameter of each roller 80 and the pitch diameter of the sprocket 84 will be described in detail. Assuming that the outer diameter of each roller 80 is D and the pitch circle diameter of the sprocket 84 is d, and that they are not equal, the following equation V'=(V-v)D/d+v (6) holds true. Here, V and V' are the speed of the chain and the transport speed of the sheet by the roller 80, respectively, as seen from the stationary system, and v is the speed of the sheet conveyed by the roller 80.
In other words, the upward or downward movement speed of the roller 80 is shown relative to the stationary system. The first term on the right side of equation (6) represents the peripheral speed of the roller 80 seen from the motion system, and equation (6) is expressed as the following equation: V'=VD/d-(1-D/d)v
... can be rewritten as (6′). As is clear from equation (6'), when D/d=1, that is, roller 8
By making the outer diameter of the sprocket 84 equal to the pitch diameter of the sprocket 84, the speed of the chain seen from the stationary system and the speed of conveying the sheet by the roller 80 can be adjusted regardless of whether the roller 80 moves upward or downward. can be made equal. roller 80
The error between the outer diameter of the sprocket 84 and the pitch circle diameter of the sprocket 84 is preferably ±2% or less.

Further, in the photographing table according to the present invention, even when the photographing table unit 16 is moving, the pair of guide members 100 restrains the movement of the sheet sent between them in the sheet thickness direction. By doing so, the leading edge of the sheet is reliably guided between both rollers 80 of the subsequent conveying means, thereby preventing damage to the leading edge of the sheet and making it possible to convey the sheet more reliably. .

In the above, an example has been described in which one transport relay means is provided above and below the photographing stand unit, but depending on the interval between the two fixed transport means, that is, the required number of photographing stand units can be changed. Depending on the stroke, multiple sets of relay conveyance means can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining the basic configuration of the photographing table according to the present invention, FIG. 2 is a longitudinal sectional view of the photographing table according to the present invention, and FIG. 3 and FIG. 1 is a front view and a side view showing a photographing stand according to the invention in a partially enlarged manner with its housing removed; FIG. 2, 2a, 2b: fixed conveyance means, 4, 16: photographing table unit, 6, 6a, 6b, 6c: conveying means of photographing table unit, 8, 8a, 8a ₁ , 8a ₂ , 8
b, 8b ₁ , 8b ₂ : Relay transport means, 20: Holder, 46: Image reading section, 50: Photoelectric reading device, 60: Erasing section, 68a, 68b: Frame member, 78a: Entrance, 78b: Exit, 80: Roller, 84: Sprocket, 96: Chain.

Claims (1)

[Scope of Claims] 1. A pair of fixed conveyance means fixedly arranged at a distance from each other, and a reciprocating movement between the pair of fixed conveyance means is arranged between the pair of fixed conveyance means, The sheet-like recording medium is transferred to an entrance for receiving the sheet-like recording medium sent by one of the fixed transport means of the pair of fixed transport means and to the other fixed transport means of the pair of fixed transport means. a first conveyance means for taking in the sheet-like recording medium at the inlet, and a second conveyance means for discharging the sheet-like recording medium at the outlet. and a photographing table unit disposed on each of the entrance and exit sides of the photographing table unit with the photographing table unit sandwiched therebetween, and movable between the pair of fixed conveyance means in the moving direction of the photographing table unit. at least one pair of relay conveyance means integrally movably coupled to each other at a radial angle of 100 mm, each of the first conveying means and the second conveying means; The maximum distance between each of the pair of relay conveyance means adjacent to each other and the maximum distance between each of the pair of fixed conveyance means and the pair of relay conveyance means adjacent to each of the pair of fixed conveyance means are determined according to the record. A radiographic imaging stand having a length equal to or less than the above-mentioned length dimension of the medium. 2. The radiographic imaging stand according to claim 1, wherein a pair of the relay conveyance means is provided. 3 the pair of fixed conveyance means, relay conveyance means;
3. The radiographic imaging stand according to claim 1, wherein the first conveying means and the second conveying means each include a pair of rollers, at least one of which is continuously driven and rotated. 4. According to claim 3, the sheet-like recording medium is a stimulable phosphor sheet that exhibits stimulated luminescence according to radiation image information stored and recorded by irradiation with excitation light. The radiographic imaging table described. 5. The stimulable phosphor sheet that has passed through the other fixed conveyance means is transferred to an image reading section for reading radiation image information recorded on the stimulable phosphor sheet in the imaging platform unit, and the stimulable phosphor sheet that has passed through the image reading section. Claim 4: The stimulable phosphor sheet is returned to the one fixed conveyance means through an erasing section for releasing residual radiant energy.
The radiographic imaging table described in Section 1. 6. The image reading section includes an excitation light source for irradiating the stimulable phosphor sheet with excitation light to obtain stimulated luminescence light corresponding to a radiation image recorded on the stimulable phosphor sheet, and a stimulable phosphor sheet. The radiographic imaging stand according to claim 5, comprising a photoelectric reading device for optically reading the stimulated luminescence light from the phosphor sheet to obtain an image signal. 7. A pair of fixed conveying means fixedly arranged at a distance from each other, and a pair of fixed conveying means arranged so as to be movable back and forth between the pair of fixed conveying means, and the pair of fixed conveying means an inlet for receiving a sheet-like recording medium sent by one of the fixed conveyance means; and an outlet for discharging the sheet-like recording medium to the other fixed conveyance means of the pair of fixed conveyance means. an imaging platform unit having a first conveyance means for taking in the sheet-like recording medium at the inlet, and a second conveyance means for discharging the sheet-like recording medium at the outlet; They are disposed on each of the entrance and exit sides of the photographing table unit with the photographing table unit sandwiched between them, and are movable in the moving direction of the photographing table unit between the pair of fixed conveyance means and move integrally with each other. at least one pair of relay conveyance means that are operably connected to each other; and a driving means for driving each of the pair of fixed conveyance means, the at least one pair of relay conveyance means, the first conveyance means, and the second conveyance means. , the pair of fixed conveyance means, the at least one pair of relay conveyance means, the first conveyance means, and the second conveyance means all have at least one pair of rollers, and at least one of the pair of rollers has a corresponding roller. An engaging portion is provided so as to be engageable with the driving means, for transmitting a driving force from the driving means for conveying the sheet-like recording medium between the rollers by the cooperation of the pair of rollers, The driving means includes at least one of the at least two fixed conveying means, at least one of the pair of relay conveying means, and at least one of the engaging portions provided on the rollers constituting the first conveying means and the second conveying means. One endless drive transmission member is provided, each of the engaging portions has an outer diameter approximately equal to the outer diameter of each of the rollers on which the engaging portion is provided, and the first conveying means and the first conveying means a maximum distance between each of the two conveying means and the pair of relay conveying means adjacent to each of the first conveying means and the second conveying means, and each of the pair of fixed conveying means and the pair of fixing means; A radiographic imaging stand, wherein a maximum distance between each of the conveyance means and the pair of relay conveyance means adjacent to each other is equal to or less than a length dimension of the sheet-like recording medium. 8. The drive transmission member is a chain, and the engaging portion is a sprocket provided coaxially with the roller so as to be rotatable integrally with the roller provided with the engaging portion. The radiation imaging table according to item 7. 9. The photographing platform unit is disposed between the first conveying means and the second conveying means, and is configured to hold the sheet-shaped recording medium carried in by the first conveying means at a photographing position. A holder, and an auxiliary conveying means provided between the holder and the second conveying means and having a roller for conveying the sheet-like recording medium discharged from the holder to the second conveying means. , a radiographic imaging stand according to claim 7 or 8.