JPH07109506B2 - Image recording material peeling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention peels an image recording material such as a photothermographic material or an image receiving material, which is wound around the outer periphery of a heating drum and subjected to a heat development transfer process, from the heating drum. The present invention relates to a method for peeling an image recording material.

[Prior Art] An image is exposed on a photothermographic material, and the photothermographic material is superposed on an image receiving material and heated, whereby the photothermographic material is thermally developed and the image is transferred to the image receiving material. A heat development transfer device for obtaining an image is known.

In this type of heat development transfer apparatus, a heating drum and an endless pressure contact belt that is in pressure contact with the outer periphery of the heating drum are arranged. The photothermographic material on which the image has been exposed is superposed on the image receiving material and then supplied between the heating drum and the endless pressure contact belt and wound around the heating drum.

Each material is nipped and conveyed for a predetermined time in a state of being overlapped between a heating drum heated to about 90 ° C and an endless pressure contact belt, whereby the photothermographic material is thermally developed and at the same time, the photothermographic material is developed. The image exposed on the material is transferred to the image receiving material.

The heat-developable photosensitive material and the image-receiving material are sandwiched by the endless pressure contact belt, and a peeling claw is arranged on the outer periphery of the heating drum near the end of the conveying direction. It is designed to be peeled off from the outer periphery of the drum.

Further, after this, the photothermographic material and the image receiving material separated from the heating drum are separated from each other by a separating lever or the like.

[Problems to be Solved by the Invention] By the way, in the conventional peeling method of peeling the photothermographic material and the image receiving material after transfer from the outer periphery of the heating drum by such a peeling nail, the peeling nail is inevitably attached to each material. Because of contact, each material is damaged during this peeling, or the heat at the contact part is dissipated by the heat transfer due to the contact (the degree of heating becomes uneven), which causes image unevenness after transfer. There was a drawback.

In consideration of the above facts, the present invention reliably peels an image recording material such as a photothermographic material or an image receiving material, which is wound around the outer periphery of a heating drum and subjected to a heat development transfer process, from the heating drum without causing image unevenness or damage. It is an object to obtain a method for peeling an image recording material that can be used.

[Means for Solving the Problems] In the image recording material peeling method according to the present invention, a photothermographic material on which an image has been exposed and an image receiving material are superposed and wound around the outer periphery of a heating drum by a pressure contact means, After heat-development of the photothermographic material by heating while sandwiching and transporting both materials between the photothermographic material and the pressure contact means and transferring the image to the image-receiving material, the photothermographic material and the image-receiving material are separated from the outer periphery of the heating drum. In the method of peeling image recording materials, the photothermographic material is positioned on the side of the heating drum, and the leading end of the photothermographic material is superposed such that the leading end in the carrying direction projects beyond the leading end in the carrying direction of the image receiving material. In the direction in which the protrusion is pulled out from the sandwiching portion between the heating drum and the pressure contact means to the downstream side in the conveying direction, the conveyance is temporarily stopped, and the protrusion portion of the photothermographic material is separated from the heating drum. After curling is caused, the conveyance is restarted, and both materials are separated from the heating drum.

Further, the image recording material peeling method according to the present invention, the imagewise exposed photothermographic material and the image receiving material are overlapped and wound around the outer periphery of the heating drum by the pressure contact means, and between the heating drum and the pressure contact means. When peeling the photothermographic material and the image receiving material from the outer periphery of the heating drum after heating both the materials while sandwiching and conveying them at a predetermined conveying speed to thermally develop the photothermographic material and transferring the image to the image receiving material Of the image recording material, wherein the photothermographic material is positioned on the side of the heating drum, and the leading end portion in the carrying direction is projected so as to project beyond the leading end in the carrying direction of the image receiving material. Is temporarily conveyed at a speed slower than the predetermined conveying speed at the time point when the both materials are pulled out from the sandwiching portion between the heating drum and the pressure contact means to the downstream side in the conveying direction, and the material is transferred to the tip protruding portion of the photothermographic material. Previous After that caused the direction of curl away from the heating drum, it is characterized in that conveys both materials again by the predetermined conveying speed, to separate the two materials from the heating drum.

[Operation] In the image recording material peeling method having the above-described structure, the photothermographic material on which the image is exposed is located closer to the heating drum than the image receiving material, and its leading end in the carrying direction projects beyond the leading end in the carrying direction of the image receiving material. Are overlaid as if to do. Further, it is supplied between the heating drum and the pressing means, and is wound around the outer periphery of the heating drum in a state of being superposed.

The wound photothermographic material and the image receiving material are heated by the heating drum while being nipped and conveyed in the opposed gap between the heating drum and the pressure contact means, and the photothermographic material is thermally developed and the image is transferred to the image receiving material. It

Then, after the transfer, when the leading end protruding portion of the photothermographic material is pulled out to the downstream side in the transport direction from the sandwiching portion between the heating drum and the pressure contact means, the transport is temporarily stopped. Here, when the tip end protruding portion of the photothermographic material is heated by the heating drum, the exposed surface side (dye surface side) thereof curls on the side opposite to the heating drum.

After curling of the tip end of the photothermographic material on the side opposite to the heating drum, the conveyance is resumed, and the photothermographic material is separated from the heating drum by the rotation of the heating drum together with the image receiving material located outside. It

After the transfer, when the protruding portion of the tip of the photothermographic material is pulled out to the downstream side in the transport direction from the sandwiching portion between the heating drum and the pressure contact means, both materials are temporarily transported at a speed slower than a predetermined transport speed. You may. Also in this case, when the tip protrusion of the photothermographic material is heated by the heating drum, the exposed surface side (dye surface side) thereof curls on the side opposite to the heating drum, and further, after curling occurs, The conveyance at a predetermined conveyance speed is restarted, and the photothermographic material is separated from the heating drum by the rotation of the heating drum together with the image receiving material located outside.

In this way, since the photothermographic material and the image receiving material are automatically peeled from the heating drum as they are conveyed, each material may be damaged by the peeling claws or the like, or the peeling claws may come into contact with each other. The contact portion does not dissipate heat due to the heat transfer (the degree of heating becomes uniform), so that a good image can be obtained without causing image unevenness after transfer.

[Examples] Examples of the present invention will be described below.

FIG. 1 shows an image recording apparatus 10 to which the image recording material peeling method according to the present invention is applied.

A photosensitive material magazine 14 is arranged on a machine base 12 of the image recording apparatus 10, and a photothermographic material 16 is rolled up and accommodated therein. The photothermographic material 16 has a photosensitive silver halide, a binder, a dye-donating substance, and a reducing agent on a support.

This photothermographic material 16 is pulled out from the outer periphery and
After being cut into a predetermined length at 18, it is wound around the outer periphery of the exposure drum 20 in the direction of arrow A. An exposure head 22 is arranged corresponding to the outer periphery of the exposure drum 20, and the exposure drum 20 is rotated at a high speed to expose an image on the wound photothermographic material 16.

The photothermographic material 16 after exposure is peeled off from the exposure drum 20 by the scraper 24 by the reverse rotation of the exposure drum 20 (direction of arrow B), and after water as an image forming solvent is applied by the water coating section 26, the photothermographic material 16 is heated. It is adapted to be sent to the development transfer section 28.

In the heat development transfer section 28, a heating drum 34 and an endless pressure contact belt 36 as pressure contact means are arranged. Also heating drum
A halogen lamp 38 is arranged inside the 34, and the outer circumference of the heating drum 34 is heated to about 90 ° C. by the halogen lamp 38.

The endless pressure welding belt 36 includes tension rollers 37, 39, 41, 43.
The outer circumference of the heating drum 34 is pressed against the outer circumference of the heating drum 34.

A superposing roller 60 is arranged near the portion where the endless pressure contact belt 36 is wound around the tension roller 37.

The photothermographic material 16 coated with water is a superposition roller.
Guided to 60, and further heated drum 34 and endless pressure welding belt
36 and is wound around the heating drum 34. In this case, the photothermographic material 16 is wound such that the exposed surface faces the outside of the heating drum 34. The wound photothermographic material 16 is sandwiched and conveyed at a predetermined conveyance speed over about 2/3 of the circumference of the heating drum 34 and is subjected to heat development. In the present embodiment, the transport speed of the photothermographic material 16 by the heating drum 34 is
It is 20 mm / sec.

On the other hand, in the tray 30 arranged below the heat development transfer section 28, a plurality of image receiving materials 32 cut into a predetermined length are housed. The width dimension of the image receiving material 32 is a photothermographic material.
It is formed wider than the width dimension of 16, and a dye fixing material having a mordant is applied to the image forming surface. The image receiving material 32 is sequentially taken out one by one by the supply roller 44 arranged on the side portion of the tray 30 and sent to the heat development transfer section 28.

The image receiving material 32 sent to the heat developing and transferring section 28 is superposed and brought into close contact with the heat developing photosensitive material 16 by the superposing roller 60, and is supplied between the heating drum 34 and the endless pressure contact belt 36. Has become. In this case, as shown in FIG. 2, the leading end of the photothermographic material 16 in the carrying direction is superposed in a state of protruding from the leading end of the image receiving material 32 in the carrying direction. In this embodiment, the tip protrusion 16A is 17 mm.
It is considered as a degree.

When the photothermographic material 16 superposed on the image receiving material 32 is heated by the heating drum 34 while being nipped and conveyed between the heating drum 34 and the endless pressure contact belt 36, the image is transferred to the image receiving material 32 while being thermally developed. An image is obtained on the image receiving material 32 by being transferred.

The heating drum 34 and the endless pressure contact belt 36, which sandwich and convey the heat-developable photosensitive material 16 and the image receiving material 32, have a tip protruding portion 16A of the heat-developable photosensitive material 16 between the heating drum 34 and the endless pressure contact belt 36 after transfer. The transport can be temporarily stopped at the time when the sheet is pulled out from the sandwiched portion to the downstream side in the transport direction (downstream side of the portion where the endless pressure contact belt 36 is wound around the tension roller 43). When the photothermographic material 16 is heated while the conveyance is stopped, the exposed surface (dye surface) is wound so as to face the outside of the heating drum 34, so that the tip protruding portion 16A is outside the heating drum 34. It is designed to curl toward.

A guide plate 62 and a separating lever 64 are arranged in the vicinity of the portion where the endless pressure welding belt 36 is wound around the tension roller 43.

When the conveyance of the heating drum 34 and the endless pressure welding belt 36 is restarted, the guide plate 62 is accompanied by this conveyance, and the tip projection 16
The photothermographic material 16 in which A is curled is separated from the heating drum 34 together with the image receiving material 32 and is guided.

The photothermographic material 16 and the image receiving material 32 separated from the heating drum 34 are separated by a separating lever 64 and conveyed.

The separated photothermographic material 16 is sent out to the waste photosensitive material storage box 59, while the image receiving material 32 is dried by the drying device 52 and then onto the take-out tray 54 formed on the top of the machine base 12. It is supposed to be sent out.

Next, the operation of this embodiment will be described.

When the photothermographic material 16 drawn from the photosensitive material magazine 14 is cut by the cutter 18 and then wound around the outer periphery of the exposure drum 20, the exposure drum 20 rotates at high speed in the direction of arrow A in FIG. The image is exposed by 22.

The exposed photothermographic material 16 is peeled off by the scraper 24 by the reverse rotation of the exposure drum 20 (direction of arrow B), and the water coating section 26
Then, it is coated with water and sent to the heat development transfer section 28.

On the other hand, the image receiving material 32 in the tray 30 is sequentially taken out one by one by the supply roller 44 and sent to the heat development transfer section 28.

The image receiving material 32 sent to the heat developing and transferring section 28 is superposed and brought into close contact with the photothermographic material 16 by the superposing roller 60, and further in the superposed state, the heating drum 34 and the endless pressure contact belt 36 (tension roller). It is supplied between the part wound around 37). In this case, as shown in FIG. 2, the front end portion of the photothermographic material 16 in the conveying direction is overlapped with the image receiving material 32 protruding by about 17 mm from the front end portion in the conveying direction.

The photothermographic material 16 superposed on the image receiving material 32 is sandwiched between the heating drum 34 and the endless pressure contact belt 36 while being kept in close contact, and is conveyed at a predetermined conveying speed (20 mm / sec). When the photothermographic material 16 is heated by the heating drum 34 heated to about 90 ° C. by the halogen lamp 38, it releases a movable dye, and the dye receives the image receiving material 32.
An image is obtained on the image receiving material 32 by being transferred to the dye fixing layer.

The photothermographic material 16 is nipped and conveyed, and its tip protruding portion 16A
Is a downstream side in the conveyance direction from the sandwiched portion between the heating drum 34 and the endless pressure welding belt 36 (the tension roller of the endless pressure welding belt 36 is
When it is pulled out to the downstream side of the portion wound around 43), the driving of the heating drum 34 and the endless pressure welding belt 36 is temporarily stopped.

When the heat-developable photosensitive material 16 is heated while the conveyance is stopped, the exposed surface (dye surface) is wound so as to face the outside of the heating drum 34.
Curls facing outward.

After the curl on the side opposite to the heating drum 34 is generated in the front end protruding portion 16A of the photothermographic material 16, the conveyance by the heating drum 34 and the endless pressure contact belt 36 is restarted.

When the transport of the photothermographic material 16 and the image receiving material 32 is restarted,
While the curled leading end protruding portion 16A is guided by the guide plate 62, the photothermographic material 16 is peeled off from the heating drum 34 together with the image receiving material 32 located outside while being conveyed.

The photothermographic material 16 and the image receiving material 32 separated from the heating drum 34 are separated by a separating lever 64 and conveyed.

The separated photothermographic material 16 is sent to the waste photosensitive material storage box 59, and the image receiving material 32 is taken out through the drying device 52.
It is taken out to 54.

In this way, since the photothermographic material 16 and the image receiving material 32 are automatically peeled from the heating drum 34 as they are conveyed, each material may be damaged at the time of peeling by a peeling claw or the peeling claw may The contact portion does not radiate heat due to the heat transfer due to the contact (the degree of heating becomes uniform), so that a good image can be obtained without causing image unevenness after the transfer.

In the present embodiment, the tip end protruding portion 16A of the photothermographic material 16 is located downstream of the nip between the heating drum 34 and the endless pressure contact belt 36 in the conveying direction (wrapping around the tension roller 43 of the endless pressure contact belt 36). Although the conveyance of the photothermographic material 16 and the image receiving material 32 is temporarily stopped at the time of extraction to the partial downstream side), the invention is not limited to this. At the time of extraction, both materials are temporarily transported at a speed slower than the transport speed after transfer (20 mm / sec) (fine speed transport), and after curling occurs, transport at the specified transport speed is resumed. It may be configured to.

[Effects of the Invention] As described above, the image recording material peeling method according to the present invention uses the image recording material such as the heat-developable photosensitive material or the image-receiving material wound around the outer periphery of the heating drum and subjected to the heat-development-transfer processing to obtain the image unevenness. It has an excellent effect that it can be reliably peeled from the heating drum without causing any damage.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an image recording apparatus to which the image recording material peeling method according to the present invention is applied, and FIG. 2 is a schematic plan view showing a dimensional relationship between a photothermographic material and an image receiving material. 10 ... Image recording device, 16 ... Thermal development photosensitive material, 28 ... Thermal development transfer section, 32 ... Image receiving material, 34 ... Heating drum, 36 ...
… Endless pressure welding belt, 62 …… Guide plate.

Claims (2)

[Claims] 1. A heat-developable photosensitive material on which an image has been exposed and an image receiving material are superposed and wound around an outer circumference of a heating drum by a pressure contact means, and heated while sandwiching and conveying both materials between the heating drum and the pressure contact means. A method for peeling an image recording material when the photothermographic material and the image receiving material are peeled from the outer periphery of the heating drum after thermally developing the photothermographic material and transferring the image to the image receiving material. The heat-developable photosensitive material is positioned on the side of the heat-developable photosensitive material, and the leading end portion in the carrying direction is superposed so as to project from the leading end portion in the carrying direction of the image receiving material. In the state where the photothermographic material is withdrawn to the downstream side, the conveyance is temporarily stopped, and after curling in the protruding portion of the photothermographic material in the direction of separating from the heating drum, the conveyance is restarted and both materials are removed. Addition Image recording material separating method which comprises causing peeled from the drum. 2. A heat-developable photosensitive material on which an image is exposed and an image receiving material are superposed and wound around the outer periphery of a heating drum by a pressure contact means, and both materials are conveyed at a predetermined conveying speed between the heating drum and the pressure contact means. An image recording material peeling method for peeling the photothermographic material and the image receiving material from the outer periphery of the heating drum after heating and developing the photothermographic material while sandwiching and transporting the image and transferring the image to the image receiving material. The heat-developable photosensitive material is positioned on the heating drum side and the leading end portion in the transporting direction is overlapped so as to project beyond the leading end portion in the transporting direction of the image receiving material. When both materials are temporarily conveyed at a speed slower than the predetermined conveying speed at the time of being pulled out from the sandwiched portion to the downstream side in the conveying direction, the both ends of the heat-developable photosensitive material are separated from the heating drum to the tip protruding portion. After causing Lumpur, it conveys both materials again at the predetermined transport speed, an image recording material separating method, characterized in that for peeling the two materials from the heating drum.