JPH06115758A - Sheet body detecting mechanism - Google Patents

Abstract

PURPOSE:To surely and easily detect whether a sheet body is provided or not by a simple constitution. CONSTITUTION:A device comprises a turning shaft 62 having an axial line parallel to the axial line of a drum 28, swivel member 64 secured to this turning shaft 62 to be engageable with a conveying direction point end part of a photosensitive material 14 by protruding one end part from a peripheral surface of the drum 28, tension spring 66 for holding this swivel member 64 in a predetermined attitude and a detector 68 for detecting whether the photosensitive material 14 is provided or not by swiveling the swivel member 64 engaged with the photosensitive material 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet body detecting mechanism for detecting the presence / absence of a sheet body sandwiched and conveyed by a drum and a conveyor belt.

[0002]

2. Description of the Related Art A sheet body feeding apparatus for taking out sheet bodies such as photographic light-sensitive materials (for example, X-ray film) and graphic arts films one by one and carrying them to the next step (for example, exposure and development). It is commonly used.

In this sheet body supply device, after the stacked sheet bodies are loaded in the sheet body arrangement portion, the uppermost sheet body is taken out from the sheet body arrangement portion under the suction action of the suction cup. Further, the sheet body is conveyed to a discharge port via a conveyance mechanism, and is supplied from the discharge port to an automatic developing device or the like.

This transport mechanism is usually provided with a relatively large-diameter drum which is rotationally driven, and a transport belt which is in circumferential contact with the drum, and a sheet body is sandwiched between the drum and the transport belt. The sheet body is conveyed under the rotating action of the drum. At that time, for example, a micro switch is used to detect whether or not the sheet body is sandwiched between the drum and the conveyor belt.

[0005]

However, in this microswitch, when the sheet body is curled, for example, the curled portion is locked by the detection portion of the microswitch, which may lead to poor conveyance of the sheet body. Resulting in. Further, the detection unit of the microswitch comes into contact with the sheet body, which may damage the sheet body.
Further, in the method of detecting the thickness of the sheet body on the drum, since the thickness of the film is as thin as about 0.2 mm, if dust or the like adheres to the drum, the dust or the like affects the microswitch. It has been pointed out that there is a problem in that the sheet is driven and an erroneous detection of the sheet body is caused. On the other hand, a method of detecting the sheet body using an optical sensor is also conceivable, but it is not practical because the sheet body may be exposed to light.

The present invention has been made in order to solve this kind of problem, and it is an object of the present invention to provide a sheet body detection mechanism capable of surely and easily detecting the presence or absence of a sheet body with a simple structure. To aim.

[0007]

In order to achieve the above object, the present invention has a sheet body which is sandwiched between a rotating drum and a conveyor belt which is in circumferential contact with the drum and is conveyed in a predetermined direction. In the sheet body detection mechanism that detects
The drum is configured such that at least one end of the drum is inwardly spaced from the side surface of the conveyed sheet body by a predetermined distance, and the sheet body detection mechanism is configured such that the one end of the drum is disposed. A rotation shaft disposed on the side and having an axis parallel to the axis of the drum, and the sheet body fixedly attached to the rotation shaft and having one end protruding radially outward from the outer peripheral surface of the drum and conveyed. And a detector that detects the presence or absence of the sheet body by swinging the swinging member in contact with the sheet body.

Further, according to the present invention, in a sheet body detection mechanism for detecting the presence or absence of a sheet body which is sandwiched between a rotating drum and a conveyor belt which is in circumferential contact with the drum and is conveyed in a predetermined direction, the drum comprises: At least one end is configured to be spaced inward from the side surface of the conveyed sheet body by a predetermined distance, and the sheet body detection mechanism is disposed on the one end side of the drum. And a rotating shaft having an axis parallel to the drum axis, and fixed to the rotating shaft so that one end of the rotating shaft can be brought into contact with the conveyed sheet body by projecting radially outward from the outer peripheral surface of the drum. A rocking member, and a detector capable of rotating the drum in the reverse direction when the rocking member detects the rear end of the sheet body.

[0009]

In the sheet body detecting mechanism according to the present invention, when the sheet body is conveyed along the outer peripheral surface of the drum, at least one side surface of the sheet body is exposed outward from the end portion of the drum. Among the leading ends of the sheet in the conveying direction, the leading end on the side exposed to the outside is directly engaged with the swing member to swing the swing member against the elastic body. Let Therefore, the presence / absence of the sheet body is automatically and surely detected by the detector, and the presence / absence detection operation of the sheet body is performed with high accuracy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sheet body detecting mechanism according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 2, reference numeral 10 indicates a sheet body feeding device having a sheet body detecting mechanism according to this embodiment. The sheet supply device 10 includes a suction mechanism 12 that sucks and holds the photographic photosensitive materials 14 that are stacked sheet one by one, and the photographic material 14 that is sucked and taken out by the suction mechanism 12. A transport mechanism 18 for sending the sheet to the outlet 16 and a sheet body detection mechanism 20 according to the present embodiment disposed in the transport mechanism 18.

The suction mechanism 12 includes a plurality of suction plates 24 connected to a vacuum supply source (not shown) for sequentially suction-holding the photographic photosensitive materials 14 stacked in the supply magazine 22, and the suction plates 24. And moving means 26 for moving the vehicle along a predetermined locus.

In this embodiment, the supply magazine 22
However, the present invention is not limited to this, and may be any structure as long as the photographic photosensitive materials 14 can be stacked and placed.

The transport mechanism 18 is a drum 2 which can rotate in the forward and reverse directions.
8, a belt-shaped first conveying system 30 arranged on one surface side of the drum 28, and a belt-shaped second conveying system 32 arranged on the other surface side of the drum 28. . The drum 28 has a cylindrical shape, and the surface thereof is mirror-finished. The length of the drum 28 in the circumferential direction is preferably one time or more the length of the photographic light-sensitive material 14 to be conveyed, but is not limited thereto. Not something that is done. Forward rotation below the drum 28,
A rotary drive source 36 for providing reverse rotation is provided, and the pulleys 3 provided on the drum 28 and the rotary drive source 36, respectively.
A belt 40 is stretched around 8a and 38b.

As shown in FIGS. 1 and 2, the first conveying system 30 includes a plurality of rollers 42a to 42d arranged around one surface of the drum 28, the rollers 42a to 42d and the drum. The belts 44a to 44c are in contact with one surface of the belt 28. Sub-belts 48a and 48b for reliably receiving the photographic photosensitive material 14 conveyed from the suction mechanism 12 are wound around the rollers 42a and the rollers 46 on the suction mechanism 12 side of the first conveyance system 30. The second transport system 32 includes a plurality of rollers 50a to 50 similarly arranged around the other surface of the drum 28.
d and belts 52a to 52c that are in circumferential contact with the rollers 50a to 50d and the other surface of the drum 28.

A carry-in port 54 is formed near the lower side of the first transport system 30 and the drum 28, while a carry-out port 56 is formed near the upper side of the second transport system 32 and the drum 28. A plurality of guide plates 58a to 58c and rollers 60a and 60b are provided near the carry-out port 56, and have a function of guiding the photographic photosensitive material 14 to an automatic developing device (not shown).

The drum 28 has both ends 28a and 28b.
Among them, at least one end portion 28a is arranged so as to be spaced inward from the side surface of the conveyed photographic photosensitive material 14 by a predetermined distance. It is exposed to the outside (direction intersecting the transport direction) (see FIG. 1). The sheet body detection mechanism 20 is arranged near the second transport system 32 on the end portion 28a side.

As shown in FIGS. 1 and 3, the sheet body detecting mechanism 20 has a rotating shaft 62 having an axis parallel to the axis of the drum 28, and one end portion fixed to the rotating shaft 62 and having the one end portion described above. A swinging member 6 that is protruded radially outward from the outer peripheral surface of 28 and is engageable with the leading end of the photographic photosensitive material 14 in the conveying direction.
4, a tension spring (elastic body) 66 that holds the swinging member 64 in a predetermined posture, and the swinging member 64 swings by engaging with the photographic light-sensitive material 14 to swing the photographic light-sensitive material. And a detector 68 for detecting the presence or absence of 14.

The rotating shaft 62 is rotatably supported by a rod 72 fixed to a mounting base 70.
One end of the swing member 64 is fixed to the tip of the. The oscillating member 64 is a linear member configured in an oval shape so as not to damage the sheet body, and the other end thereof projects further outward from the outer peripheral surface of the drum 28 by a predetermined length in the radial direction. There is. One end of the tension spring 66 is fixed to one end of the swinging member 64, and the other end of the tension spring 66 is fixed to a rod body 74 fixed to a mounting base 70.
Under the pulling action of 6, the swinging member 64 is held in the radial direction of the drum 28.

The detector 68 is an optical sensor having a light emitting portion and a light receiving portion. The detector 68 is fixed to a mounting base 70, while the rotary shaft 62 is provided with the detector 68. The detector 68 is turned on by entering between the light emitting part and the light receiving part.
The detector 76 for the OFF drive is fixed.

Next, the operation of the sheet body detecting mechanism 20 thus constructed will be described in connection with the sheet body supplying apparatus 10.

After the supply magazine 22 is loaded in the sheet supply device 10, the suction plate 24 is moved to the supply magazine 22 side to approach the photographic light-sensitive material 14, and the photographic light-sensitive material 14 is given a predetermined distance. Suction starts at the height. When the suction plate 24 sucks the photographic photosensitive material 14 and reaches a predetermined position, the suction plate 24 rotates the photographic photosensitive material 14 by a predetermined angle range and holds the photographic photosensitive material 14 by the sub-belts 48a and 48b.
After being sent up, the adsorption action of the photographic light-sensitive material 14 is released.

The starting end of the photographic light-sensitive material 14 is sandwiched between the drum 28 which is rotating forward in the direction of arrow a in FIG. 2 and the first conveying system 30, and is guided to this drum 28 in the direction of arrow a. Be transported. When the starting end of the photographic photosensitive material 14 is sandwiched between the drum 28 and the second conveying system 32, the leading end of the photographic photosensitive material 14 exposed outward from the end 28a of the drum 28 is a sheet. The other end of the rocking member 64 constituting the body detecting mechanism 20 is engaged to rock the rocking member 64 against the tension spring 66 (see the chain double-dashed line in FIG. 2).
Therefore, the detector 76 swings integrally with the swing member 64 and the rotary shaft 62, and the detector 76 is separated from the space between the detectors 68 to detect the presence of the photographic photosensitive material 14.

In this state, when the photographic light-sensitive material 14 is conveyed in the direction of the arrow a through the drum 28 and the second conveying system 32 and the end of the photographic light-sensitive material 14 is separated from the swing member 64, this swing is performed. The member 64 returns to a predetermined posture, that is, a posture directed in the radial direction of the drum 28, under the tension action of the tension spring 66 (see the solid line in FIG. 2). Therefore, the detector 76 is inserted between the detectors 68, and the photographic material 14
Is detected as not present. The rotation drive source 36 is immediately stopped by a signal from the detector 68, and the photographic photosensitive material 14 is held by the drum 28 and the second transport system 32.

Then, the drum 28 is moved in the direction of arrow b in FIG.
Is reversely rotated and the end of the photographic photosensitive material 14 is carried out from the carry-out port 56 of the drum 28. Here, the photographic light-sensitive material 14
Is in the inverted state. When the end of the photographic light-sensitive material 14 is released from the second conveying system 32, the photographic light-sensitive material 14 is transferred to the belts 52a to 5 of the second conveying system 32.
While being in contact with 2c, it is guided between the guide plates 58a to 58c and sent to an automatic developing device (not shown). The photosensitive material 14 whose back surface is sucked by the suction plate 24 by the drum 28 and the first and second conveying systems 30, 32.
Will have its front and back reversed.

In this case, in this embodiment, at least one end portion 28a of the drum 28 is arranged inwardly separated from the side surface of the photographic photosensitive material 14 being conveyed by a predetermined distance. The tip portion of the side surface of the material 14 is exposed to the outside of the end portion 28a and directly engages with the swinging member 64 constituting the sheet body detection mechanism 20. Therefore, the swinging member 64 is swung to drive the detector 68,
The effect of automatically and surely performing the work of detecting the presence or absence of the photographic light-sensitive material 14 is obtained. Moreover, the drum 2
Since the swinging member 64 is directly swung by the tip of the photographic photosensitive material 14 exposed to the outside of the end 28a of No. 8, even if dust or the like adheres to the outer peripheral surface of the drum 28 The presence or absence of the photographic photosensitive material 14 can be detected with high accuracy without being affected.

[0027]

As described above, the sheet body detecting mechanism according to the present invention has the following effects and advantages.

At least one side surface of the sheet body is exposed to the outside from the side portion of the drum, and the tip portion of the sheet body on the side surface exposed to the outside is directly engaged with the swing member to swing the swing member. Since the moving member is swung against the elastic body, it is possible to reliably detect the presence or absence of the sheet body. Moreover, even if dust or the like adheres to the drum, it is not affected by this, and the presence / absence detection operation of the sheet body can be performed with high accuracy and easily with a simple configuration.

[Brief description of drawings]

FIG. 1 is a perspective view of a sheet detection mechanism and a conveyance mechanism according to the present invention.

FIG. 2 is a schematic vertical cross-sectional view of a sheet body supply device using the sheet body detection mechanism.

FIG. 3 is a side view of the sheet body detection mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Sheet body supply device 12 ... Adsorption mechanism 14 ... Photosensitive material 18 ... Conveyance mechanism 20 ... Sheet body detection mechanism 24 ... Adsorption board 28 ... Drum 30, 32 ... Conveyance system 44a-44c, 52a-52c ... Belt 62 ... Moving shaft 64 ... Oscillating member 66 ... Tensile spring 68 ... Detector 76 ... Detector

Claims (3)

[Claims] 1. A sheet body detection mechanism for detecting the presence or absence of a sheet body which is sandwiched between a rotating drum and a conveyor belt which is in circumferential contact with the drum and which is conveyed in a predetermined direction, wherein the drum has at least one end. The sheet body detecting mechanism is arranged so as to be spaced inward from the side surface of the conveyed sheet body by a predetermined distance, and the sheet body detecting mechanism is disposed on the one end side of the drum and A rotating shaft having an axis parallel to the axis, and a swinging member fixed to the rotating shaft and capable of abutting against the sheet body conveyed with one end thereof protruding radially outward from the outer peripheral surface of the drum. And a detector configured to detect the presence or absence of the sheet body by the swinging member contacting the sheet body and swinging the sheet body, the sheet body detecting mechanism. 2. The sheet body detecting mechanism according to claim 1, further comprising an elastic body for holding the swinging member in a predetermined posture. 3. A sheet body detection mechanism for detecting the presence / absence of a sheet body which is sandwiched between a rotating drum and a conveyor belt which is in circumferential contact with the drum and is conveyed in a predetermined direction, wherein the drum has at least one end. The sheet body detecting mechanism is arranged so as to be spaced inward from the side surface of the conveyed sheet body by a predetermined distance, and the sheet body detecting mechanism is disposed on the one end side of the drum and A rotating shaft having an axis parallel to the axis, and a swinging member fixed to the rotating shaft and capable of abutting against the sheet body conveyed with one end thereof protruding radially outward from the outer peripheral surface of the drum. And a detector capable of rotating the drum in the reverse direction when the swinging member detects the rear end of the sheet body, the sheet body detection mechanism.