JPS59124648A - Nip roll for accumulating sheets - Google Patents

Abstract

PURPOSE:To prevent accumulative fluorescent sheets from abrasions in sheet accumulating nip rolls for handling said sheets by arranging the respective rolls such that an angle made between a plane containing both axes of the rolls and the bottom surface of a tray is obtuse one. CONSTITUTION:A sheet accumulating nip roll 43 consists of a pair of nip rolls 43A, 43B and is arranged in upward front of a tray 47 to be driven by a drive unit in the direction of arrow in the drawing for sending sheets 12 above the tray 47. A plane P containing the axes O, O' of both rolls 43A, 43B is arranged so as to make an obtuse angle alpha with the bottom surface 47a of the tray in the downstream side of sheet feeding direction. Thus, the sheet 12 is sent out upwardly from the nip rolls 43A, 43B to be flexed by its own weight so that the end contacts the sheet 12'. That is, the sheet 12 is supported on the front and rear ends by the sheet 12' and the nip rolls 43A, 43B to take an arcuate position so that any abrasions are not produced on the upper surface of the sheet 12'.

Description

[Detailed Description of the Invention] A nip roll for stacking sheets that feeds flfB materials one by one (tray vC core sheet), and particularly relates to a nip roll for stacking sheets that handles sheet members that are used repeatedly, such as sheets containing stimulable phosphor sheets. It is.

When a certain type of phosphor is fully irradiated with radiation i (X-rays, α-rays, β-rays, γ-rays, ultraviolet rays, etc.), the energy of this radiation -gI
It is known that when S is accumulated in a phosphor and this phosphor is fully irradiated with excitation light such as visible light, the phosphor exhibits stimulated luminescence depending on the accumulated energy. A phosphor that exhibits these properties is called a storage phosphor.

By using this stimulable phosphor, all the radiation image information of the human body, etc. can be stored in a layer made of stimulable phosphor? Sheet with (hereinafter,
The stimulable phosphor sheet is recorded on a ``stimulable phosphor sheet'' (or simply ``sheet''), and the stimulable phosphor sheet is scanned with excitation light such as a laser beam to generate stimulated luminescence light. The applicant has already proposed a radiation image recording and reproducing system in which an image signal is obtained by photoelectrically reading photostimulated luminescent light, and based on this image signal, it is output as a visible image to a recording material such as a photographic light-sensitive material, CRi', etc. has been done. (Unexamined Japanese Patent Publication No. 55-
No. 12429, No. 56-11395, etc. ) This system has an extremely practical advantage in that it can record the entire image over an extremely wide radiation exposure area compared to conventional radiographic systems using silver halide photography. That is, in a stimulable phosphor, it is recognized that the amount of emitted light that is stimulated to emit light due to excitation after accumulation is proportional to the amount of radiation exposure over an extremely wide range.
Therefore, even if the amount of radiation exposure fluctuates considerably depending on various imaging conditions, the amount of emitted light will not change. Read gain? The amount of radiation exposure can be determined by setting an appropriate value, reading it with a photoelectric conversion means, converting it into an electrical signal, and using this electrical signal sound to output it as a visible image to a recording material such as a photographic light-sensitive material or a display device such as a CRT. It is possible to obtain radiographic images that are not affected by fluctuations in

According to this system, constant radiation image information accumulated and recorded in a stimulable phosphor is converted into an electrical signal, the majority of the signal processing is performed after T, and this electrical signal is used to produce a recording material such as a photographic light-sensitive material. By outputting it as a visible image to a display device such as , Cf1T, etc., it is possible to obtain a very large effect that all radiation images with excellent suitability for observation and interpretation (diagnosis suitability) can be obtained.

The stimulable phosphor sheet used in this radiation image recording and reproducing system is stored in a cassette or magazine and handled, and the stimulable phosphor sheet on which the radiation image has been stored and recorded is stored in the cassette or magazine and handled. It is attached to a sheet feeding device such as a cassette feeder or a magazine feeder, from which the stimulable phosphor sheets are fed one by one to the radiation image reading device. The sheet on which the radiation image has been read by the reading device is then erased by an image erasing device to erase residual radiation energy, and is used again to record a radiation image.

In the radiation image recording and reproducing system described above, for example, in order to collect the sheets discharged from the image erasing device, or to temporarily stock the sheets conveyed within the radiation image reading device, etc. Trays on which sheets are stacked horizontally are often used. In other words, the above-mentioned sheets are used in various sizes depending on the radiographic area, etc., and after being randomly supplied to the radiographic image recording and reproducing system, they are grouped by size using several types of trays. In many cases, in order to stack a large number of these trays at the same location, it is necessary to arrange each tray horizontally in order to reduce the arrangement space.

Sheets are normally fed into this horizontal tray by a pair of nip rolls placed one below the other in front of the tray; The back of the stimulable phosphor sheet that is fed in rubs against the sheet that was fed in earlier, causing scratches, and these scratches are a big problem, especially when this sheet is used many times.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a Nisprolge for sorting and accumulation that can significantly reduce the occurrence of scratches on sheet members.

As mentioned above, the sheet stacking nip roll of the present invention is different from the conventional sheet stacking nip roll in that the housing 1 has a pair of rolls IA and IB placed above and below each other, as shown in FIG. The sheet 3 is formed so that its plane including the central axis is perpendicular, and almost the entire weight of the sheet 3 sent out from the rolls IA and 1B is transferred to the tray 4 through the tip of the sheet 3.
sheet 3', i.e. sheet 3
Since the tip part applies a large surface pressure to the upper surface of the sheet 3', scratches are likely to occur on the lower surface of the sheet 3 and the upper surface of the sheet 3'. 3) The nip roll pair is arranged so that the angle formed on the downstream side in the sheet feeding direction is an obtuse angle in order to completely prevent the occurrence of scratches by reducing the surface pressure between 3 and 3'. It is.

When a pair of rolls is arranged as described above, the sheet is ejected upward from the rolls and is extended in an arch shape while being supported by the rolls due to its own rigidity. Therefore, when the leading edge of the sheet comes into contact with the sheet on the tray, the weight of the sheet is received not only by the leading edge of the sheet but also by the roll, and the surface pressure applied by the leading edge of the sheet to the sheet on the tray is reduced. . Furthermore, since the leading end of the sheet comes into contact with the sheet on the tray at a position farther from the roll, the area where the sheets rub against each other becomes smaller.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Ru.

FIG. 2 shows a radiation image reading system using a sheet stacking nip roll according to an embodiment of the present invention. After the cassette 13 that accommodates the stimulable phosphor sheet 2 on which a radiographic image has been accumulated is attached to the cassette attachment section 11 of the cassette feeder 10, the sheet 12 is vacuum-adsorbed to the suction arm 14. Cassette 13 was also taken out. The suction arm 14 moves to introduce the leading end (lower end in the figure) of the sheet 12 between the pair of endless belts 15, and then stops air suction.

The sheet 12 is discharged through the endless belt 15 and a pair of nip rolls 16 to a discharge port 17. A sheet receiving port 21 of the radiation image reading device 20 is arranged opposite to this discharge port 17, and the sheet 12 discharged from the discharge port 17 may be transferred to the sheet receiving port 21 or the horizontal conveying belt 21 in the radiation image reading device 20. placed on top. This horizontal conveyor belt 22' (?...above the sheet 12
An image reading system 23 is provided which scans the image with excitation light such as a laser beam, and photoelectrically reads the stimulated luminescence light emitted from the sheet 12 by this scanning. The image is sheet 1
2 is read by this image reading system 23 while being transported by the horizontal transport belt 22. The sheet 12 whose radiation image has been read by photons is discharged from the discharge port 24 and fed into the image erasing device 30 from the sheet receiving port 31 . In this image erasing device 30, sheets 8 and 12 are
While being transported by the horizontal transport belt 32, the sheet 12 is fully irradiated with erasing light from the erasing light source 33 located above.
The radiation images stored and recorded in the image will be deleted. This erasing light source 33 emits the radiation energy stored in the stimulable phosphor of the sheet 12 by irradiating it with light included in the excitation wavelength region of the stimulable phosphor. A tungsten lamp, a halogen lamp, an infrared lamp, a laser light source, etc. as shown in Japanese Patent Publication No. 56-11392 may be used as desired. Note that the radiation energy stored in the stimulable phosphor can also be released by heating the stimulable phosphor, as shown in Japanese Patent Laid-Open No. 56-12599, for example. The erasing light source 33 may be replaced with heating means.

The sheet 12 on which the radiation image has been erased is discharged from the discharge port 34, and then passed through the sheet receiving port 41 to the sheet stacking device 40.
sent inside.

In this sheet stacking device 40, the sheets 12 are moved to the elevator 4.
2, e.g. each tray 4 depending on its size.
7, 48, 49. ．． 50. each tray 4
Disoprol for sheet accumulation 43. 44, 45. /16 is provided.

The manner in which the sheets 12 are stacked by the sheet stacking nip roll will be described in detail below with reference to FIG.

The sheet stacking nip roll 43 consists of a pair of nip rolls/13A and 43B, arranged approximately horizontally) and a lay 47 (by disposing horizontally, a large number of trays can be arranged in the sheet stacking device 40. ), and is rotationally driven in the direction of the arrow in the figure by a drive device (not shown) to feed the sheet 12 above the tray 47. A pair of nip rolls 43A.

/13B is different from the conventional tray nip roll as shown in FIG. 1, and has both rolls 43A.

The plane P including the center axis O2σ of the tray 43B is disposed on the downstream side in the feeding direction of the sheet so that the angle α formed with the tray bottom surface 47a is an obtuse angle (α>90°).

Therefore, these nip rolls 43A, 4
From 3B, the nip roll 43A is sent out in two directions.
When the feeding length from 43B becomes longer, it bends due to its own weight, and the top sheet 1 whose leading end is stored in the tray 47
2'. That is, the leading end and the rear end of the sheet 12 are respectively sheet 12' and nip roll 43A.
,, j3B, and is in an arched state.

In this state, the sheet 12 is attached to the nip rolls 43A, 43B
until the trailing edge falls onto the sheet 12', while the leading edge of the sheet is completely fed out from the no.
'You will be sliding on the top from the left to the right in the diagram.

However, as described above, the weight of the sheet 12 is not only at the leading end of the sheet but also at the nip roll 43A.

43B, the force pressing the top end of the sheet against the upper surface of the sheet 12' is not so large, and the force pressing against the lower surface of the sheet 12 or the upper surface of the sheet 12' is not so large.
There will be no scratches on the top surface of 2'. Additionally, the leading edge of the arched sheet 12 has a higher nip roll/13
Place it in a position away from A, 13B and touch the seat 12'. As a result, the distance between the seams 1-12 and 12' that rub against each other is short, which is also advantageous in preventing scratches.

In the above example, a half-sized stimulable phosphor sheet (thickness: about 500 tt, mass: 200 g, 200
Deflection amount 1 when the length of mrrt is supported on a cantilever
00 mm), the length of the tray 47 is 4
40 mm, width (360 mm), nip roll 4.3A from tray surface 47a.

The height to the nip point of 43T3 is 5omm, and α=
95-120°, i.e. sheet] 2 is the tray bottom surface 47
Nip roll 43A upward 5 to 30' to a
, 43B gave good results.

In the embodiment described below, the sheet 12 on which the image has been erased is
The present invention is applied to a nip roll for supplying notes for trays 47 to 50 on which sheets are piled up, but the present invention is also applicable to a nip roll for supplying notes to trays 47 to 50 on which sheets are stacked.
The present invention can be applied to a nip roll for sheet accumulation for any tray on which stimulable phosphor sheets are stacked, such as a tray temporarily stocked for priority processing of other sheets.

As explained in detail above, the note accumulating nip roll of the present invention has an extremely simple structure and is particularly effective in preventing scratches on the sheet side surface of stimulable phosphor sheets and the like that are used repeatedly. and its practical value is extremely high.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view showing a conventional sheet stacking nip roll, FIG. 2 is a schematic diagram showing a sheet stacking nip roll according to an embodiment of the present invention and a radiation image reading system using the nip roll, and FIG. FIG. 3 is a side sectional view showing in detail the sheet stacking nip roll of FIG. 2; 3,3'...see!・Member 12, ], 2'... stimulable phosphor sheet 4.47, 4
8,49,50...Tray 43A, 43B...Nip roll 47a...Tray surface 0.0'...Center axis of nip roll

Claims (1)

[Claims] In a pair of sheet stacking nip rolls arranged approximately horizontally and feeding the sheet portion paulownia into one tray, the sheet of the pair of σ sheets is connected to the surface including the central axis of both rolls and the tray (i surface). 71f indicates that each roll is arranged at 5 such that the angle formed on the downstream side of the feed direction is an obtuse angle.
Features a nip roll for sheet accumulation.