JP3394355B2 - Image recording medium peeling mechanism, image recording apparatus incorporating the same, and image recording medium peeling method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peeling mechanism for peeling an image recording medium from a cylindrical drum after recording an image on the image recording medium in a rotary cylindrical drum type image recording apparatus, and its application technique.

[0002]

2. Description of the Related Art Generally, in a cylindrical outer surface scanning type plate making output scanner or the like, a photosensitive material as an image recording medium is mounted on the outer peripheral surface of a cylindrical recording drum, and an image is formed while the recording drum rotates at a high speed. Is recorded by exposure. Then, the photosensitive material is peeled off from the recording drum and is carried out to the developing device. The conventional device for peeling the sensitive material is configured as follows.

That is, after the image recording is completed, the rotation of the recording drum, which was rotating at a high speed, is temporarily stopped. At this stage, the peeling claw provided for peeling the photosensitive material is at the retracted position above the recording drum so as not to interfere with the image recording process, and is completely separated from the recording drum. Then, the rotation stop position of the recording drum is detected by the sensor, and the recording drum is rotated at a low speed to a position where the separation of the photosensitive material of the recording drum should be started.

Thereafter, the peeling claw is lowered near the outer peripheral surface of the recording drum, and the recording drum is rotated at a low speed, so that the outer peripheral surface of the recording drum near the end of the photosensitive material wound around the outer peripheral surface of the recording drum. When the peeling claw is located at a standby position slightly apart from the recording drum above the groove formed above (hereinafter referred to as “peeling groove”), the peeling claw is stopped again. (This series of operations is hereinafter referred to as "positioning".) Then, the peeling claw, which was slightly separated from the outer peripheral surface of the recording drum until then, is further lowered to be inserted into the peeling groove (the position of the peeling claw at this time). (Hereinafter referred to as "peeling position"), the photosensitive material is peeled by rotating the recording drum at a low speed with the peeling claw inserted between the recording drum and the photosensitive material.

[0005]

By the way, in the above-described conventional method for peeling a sensitive material, it takes a long time for the positioning process. The reason is as follows.

That is, when the recording drum, which has been rotating at a high speed after the image recording is stopped, is rotated at a low speed to position the peeling claw at the standby position above the peeling groove near the end of the photosensitive material, the conventional method is used. As described above, the sensor grasps the rotational position of the recording drum. However, because the rotation speed is too high during high-speed rotation of the recording drum,
It is practically impossible to detect the rotational position with a sensor.Therefore, after the recording drum is stopped once, it is rotated at a low speed, and after detecting the rotational position, the peeling claw is located above the peeling groove near the edge of the photosensitive material. The step of stopping the recording drum again so that the recording drum is positioned at the standby position is required. The presence of this step lengthens the time until the start of peeling.

On the other hand, in order to shorten the time of the positioning process, when the peeling claw is lowered from the standby position to the peeling position,
A technique has also been proposed in which the recording drum is kept at low speed without stopping, and when the peeling claw is positioned above the peeling groove near the end of the photosensitive material wound around the outer peripheral surface of the recording drum, the peeling position is lowered. However, in this case, control by software was not in time, and the timing was often incorrect.

Further, there is a problem that the device structure becomes complicated and large-scale. The reason is as follows.

Conventionally, the peeling claw is driven by a solenoid or a motor with a cam attached, but as described above, in the series of steps from image recording to peeling of the photosensitive material, the position of the peeling claw is changed. Is changed in 3 steps. That is, there are three steps, namely, a position change to each of the retracted position, the standby position, and the peeling position. As described above, in order to change the position of the peeling claw in three steps, it is necessary to have a mechanism that is quite complicated and large. Further, as described above, when momentarily stopping the recording drum that is rotating at high speed,
Since a large-scale braking device was required, the device configuration was complicated and large-scale.

[0010]

OBJECTS OF THE INVENTION The present invention is intended to overcome the above-mentioned problems in the prior art, and a first object of the present invention is that it does not require the extra step of positioning the cylindrical drum (recording drum) with respect to the peeling means, and it is quick. It is an object of the present invention to provide a technique capable of performing a peeling process on a different image recording medium.

A second object of the present invention is to provide an improvement which is compact and has a simple structure, and a peeling means such as a peeling claw can be brought close to a cylindrical drum at an accurate timing.

[0012]

In order to achieve the above object, the first peeling mechanism of the present invention (the peeling mechanism of claim 1).
In a peeling mechanism for peeling the image recording medium from the cylindrical drum after an image is recorded on the image recording medium wound around the outer peripheral surface of the cylindrical drum, a notch is formed on the outer peripheral surface of the cylindrical drum. In addition, (a) peeling means for peeling, (b) a movable mechanism that is coupled to the peeling means and causes the peeling means to separate from and approach the cylindrical drum, and (c) the The peeling means is coupled to the movable mechanism, and guides the peeling means along the outer peripheral surface of the cylindrical drum by following a circumferential path passing through the notch in the outer peripheral surface of the cylindrical drum during rotation of the cylindrical drum. And a guide member.

Then, when the guide member follows other than the cutout portion in the circumferential path, the peeling means is separated from the image recording medium and the guide member passes through the cutout portion. The peeling means moves up and down to access the end portion of the image recording medium in association with the vertical movement at this time, whereby the peeling of the image recording medium from the cylindrical drum is started.

According to a second peeling mechanism of the present invention (the peeling mechanism of claim 2), in the first peeling mechanism, the notch portion is the width of the outer peripheral surface of the cylindrical drum around which the image recording medium is wound. It is characterized in that it is provided outside the range of.

The image recording apparatus of the present invention (the apparatus of claim 3) is a cylindrical outer surface scanning type image recording apparatus incorporating the peeling mechanism of the first or second configuration.

According to a fourth aspect of the present invention, in the peeling of the image recording medium using the first or second peeling mechanism, the cylinder is used for image recording while the peeling means is separated from the cylindrical drum. A step of rotating the drum at a high speed (first speed); a step of reducing the rotation speed of the cylindrical drum to rotate at a low speed (second speed) after the image recording is finished; The step of moving the movable mechanism until the guide member comes into contact with the outer peripheral surface of the cylindrical drum during the rotation at, and the guide member follows the notch formed on the surface of the cylindrical drum. And inserting the peeling means between the outer peripheral surface of the cylindrical drum and the image recording medium to start peeling the image recording medium from the cylindrical drum.

Further, the method of claim 4 includes a mode in which the rotation is stopped for a very short time when the high speed rotation is changed to the low speed rotation for the convenience of the rotation control sequence. That is, the invention of claim 4 is characterized in that an extra rotation state is not inserted between the high speed rotation and the low speed rotation for the positioning processing of the peeling means by the separate positioning device.

[0018]

In the peeling mechanism according to any one of claims 1 to 3, by using the cylindrical drum as a cam, the raising and lowering when the guide member passes through the notch becomes the raising and lowering of the peeling means through the movable mechanism, whereby the peeling means. Accesses the edge of the image recording medium. Therefore, peeling can be started at an accurate timing.

Therefore, the positioning of the peeling means with respect to the image recording medium is automatically performed when the peeling means approaches the end of the image recording medium as the cylindrical drum rotates, and this positioning process is performed. Does not require a separate positioning device.

Therefore, according to the present invention, the structure of the device is simplified, and the time delay of positioning due to the use of a separate positioning device can be prevented.

Particularly, in the apparatus of claim 2, since the notch is formed outside the winding width of the image recording medium, the circumferential path through which the guide member passes does not pass over the image recording medium. Therefore, due to the relationship between the material of the guide member and the material of the image recording medium, the image recording medium may be damaged when the guide member comes into contact with and passes over the image recording medium. This has the effect of preventing damage to the recording medium.

On the other hand, since the apparatus according to claim 1 or 2 has the feature of automatic positioning as described above, it is not necessary to rotate the cylindrical drum excessively only for positioning the image recording medium with respect to the peeling means. The method according to claim 4 is configured to take advantage of this feature, and it is possible to shift from high-speed rotation for image recording to low-speed rotation for peeling in a short time. Therefore, the time for peeling off the image recording medium is particularly shortened.

[0023]

【Example】

[0024]

[1. FIG. 1 is a partial perspective view of a main part of an image recording apparatus (more specifically, an outer surface scanning type cylindrical drum scanner for plate making) incorporating a peeling mechanism according to an embodiment of the present invention. Is. This apparatus includes a recording drum (cylindrical drum) 10, a peeling unit 20, and a discharge unit 30, and further includes a film supply unit and an image exposure unit (not shown). The general operation of this device is as follows. The detailed operation will be described later.

In this apparatus, after the light-sensitive material film supplied from the film supply unit is wound around the outer peripheral surface of the recording drum 10, the recording drum 10 is rotated at a high speed and then the exposure means of the image exposure unit is used for the purpose. The recorded image is exposed and recorded on the film. After the exposure process is completed, the film is recorded on the recording drum 1 by the peeling claws 21 provided in the peeling section 20.
It is peeled from 0 and discharged from this apparatus by the discharging unit 30. Of these, the peeling unit 20 and the notches 11 and 12 (described later) on the recording drum 10 realize the basic structure of the peeling mechanism according to the features of the present invention.

2 and 3 are a plan view and an enlarged partial side view of the main part of this image recording apparatus, respectively.
Corresponds to the view seen from the direction of arrow III in FIG. However, in order to facilitate understanding, the discharge unit 30 of FIG. 1 is not shown in FIGS. 2 and 3. The side plate 40 and the motor 41 shown in FIG. 2 are not shown in FIGS. 1 and 3. Furthermore, in the following description, FIGS.
Will be referred to appropriately, but a detailed description of these figures will be given later.

In these figures, a peeling claw 21 is provided on the outer peripheral surface S of the recording drum 10 for peeling the photosensitive material film.
Is formed with a peeling groove 11 and a notch 12 for using the recording drum 10 as a cam. In addition,
The peeling claw 21 and the peeling groove 11 are also shown in FIG. 1, but in FIG. 1 and FIG. 2, two out of every 10 of them are numbered. Further, since the peeling groove 11 and the cutout portion 12 are located at the same position in the cylindrical axis direction of the recording drum 10, they are shown as overlapping in FIG.

The peeling section 20 includes a peeling claw 21 for peeling the photosensitive material film F (FIG. 3) from the recording drum 10 and a peeling claw 2.
And a link 22 for driving 1 (“movable mechanism”). The link 22 includes a pair of arms 22A (FIG. 3), a cam receiving plate 22B that projects in an L shape from the arm 22A, and a peeling claw support plate 22C that is hung between the pair of arms 22A. It is possible to ascend around the link rotation shaft 23 as indicated by arrows A1 and A2 in FIG. The peeling claw 21 described above is fixed and aligned with the peeling claw support plate 22C. A pair of side plates 40 (FIG. 2) supporting the link rotation shaft 23 are provided on both ends of the recording drum 10, and a motor 41 is connected to the side plates 40.

The motor 41 rotationally drives the shaft 48, which is inserted into the cam hole 22H formed in the arm 24A (FIG. 3). The oval cam 24 is fixed to the shaft 48, and the shaft 48 is shown in FIG.
When rotated as indicated by arrow B1, the cam 24 rotates and pushes the cam receiving plate 22B upward. As a result, the entire link 22 is retracted upward as indicated by an arrow A1 with the link rotation shaft 23 as a pivot axis, whereby the peeling claw 21 is separated from the outer peripheral surface S of the recording drum 10 (see FIG. 5A).

On the other hand, when the shaft 48 rotates in the opposite direction as shown by the arrow B2 in FIG. 3, the cam 24 rotates in the opposite direction to come into contact with the cam receiving plate 22B and move downward from the cam receiving plate 22B. Along with this, the entire link 22 is lowered by its own weight with the link rotating shaft 23 as a pivot, as shown by an arrow A2, whereby the peeling claw 21 causes the peeling claw 21 to move.
Is close to the outer peripheral surface S (FIG. 6B).

Both arms 22A of the link 22 in FIG. 3 are also provided with bearings 25 which are configured as resin roll bearings. This bearing 25
Is separated from the outer peripheral surface S of the recording drum 10 when the link 22 is retracted in the direction of the arrow A1, and above the outer peripheral surface S of the recording drum 10 when the recording drum 10 is rotated in this state. , Idles relatively to the outer peripheral surface S (FIG. 6A). On the contrary, when the link 22 descends in the direction of the arrow A2, the link 22 is in contact with the outer peripheral surface S of the recording drum 10. When the recording drum 10 is rotated in this state, the bearing 25 of the recording drum 10 rotates. It follows along the circumferential path along the outer peripheral surface S (FIG. 6B). Therefore, the bearing 25 connects the link 22 to the recording drum 10.
It functions as a guide member for guiding along the outer peripheral surface S of the.

Reference is now made to FIG. 10, which is a partially omitted development view of the outer peripheral surface S of the recording drum 10. As can be seen from FIG. 10, the peeling groove 11 is provided within the maximum range FA of the width around which the photosensitive material film F is wound, but the notch 12 is formed outside the range FA of this width. The circumferential path P along which the bearing 25 travels passes through this cutout 12.

Therefore, the recording drum 10 in FIG.
When the bearing is rotated, the bearing 25 drops into the notch 12 once per rotation (see FIGS. 7A and 7B and FIG. 8).
(A)) After that, it goes out of the notch 12 (Fig. 8).
(B)). Therefore, at the position of the notch 12, the bearing 2
5 moves up and down once, and the arm 22A and the peeling claw 21 connected thereto move up and down accordingly.

On the other hand, as can be seen from FIGS. 1 and 2, since the cutout 12 is aligned with the peeling groove 11, the cutout 12 is formed.
Peeling claw 21 when the bearing 25 sinks at the position
The tip of the is inserted into the peeling groove 11. Then, after that, at the timing when the bearing 25 comes out from the notch 12, the peeling claw 2
The tip of No. 1 goes out of the peeling groove 11 to access the sensitive material film F and scoops up the tip (FIG. 8). The sensitive material film F is recorded on the recording drum 1 as the cylindrical drum 10 rotates thereafter.
It is peeled from the outer peripheral surface of No. 0.

Both ends of the shaft of the restraining roller 26 are rotatably and vertically movable in a notch 22N (FIG. 3) formed at the tip of the arm 22A. The restraining roller 26 prevents the photosensitive material film F from being curled when the photosensitive material film F is peeled off.

The light-sensitive material film thus peeled off from the recording drum 10 is carried out to the automatic developing machine through the discharging section 30 shown in FIG.

[0037]

[2. FIG. 4 is a flow chart showing the operation procedure of the image exposure process for the photosensitive material film and the peeling process of the film from the recording drum 10 in the image recording apparatus incorporating the peeling mechanism of this embodiment.
5 to 9 show the recording drum 10 of the apparatus of this embodiment.
FIG. 7 is an operation explanatory diagram of each operation of the peeling section 20. 5 to 9, the peeling claw 21, the bearing 25, and the portion of the cam 24, which is on the back side of the arm 22A and is not originally visible, are also drawn with solid lines for convenience. The details of the operation of the image output apparatus according to this embodiment will be described below with reference to this flowchart and FIGS. The operation according to this flowchart is automatically executed under the control of the computer.

First, in step S1, the light-sensitive material film F (hereinafter referred to simply as "film F") fed from the film supply unit is used.
(Referred to as “)” is wound around the outer peripheral surface of the recording drum 10, and while the recording drum 10 is rotating at a high speed, a target image is exposed on the film F by the exposing means. During this time, as shown in FIG. 5A, in the peeling section 20, the cam 24 links the link so that the peeling claw 21 and the bearing 25 are completely separated from the recording drum 10.
It is in a state of being lifted around (hereinafter referred to as "evacuated state"). As shown in FIGS. 5 (a) to 7 (a), the film F is wound around the recording drum 10 in a state where one end is located in the middle of the peeling groove 11 so as to cover the peeling groove 11 about half. There is.

Next, in step S2, due to the control relation,
The recording drum 10 is stopped. Also at this time, the peeling section 20 is in the retracted state as shown in FIG.

Next, in step S3, the recording drum 10
Start rotating at low speed. At this time also, the peeling section 20 is in the retracted state as shown in FIG.

Then, in the next step S4, the peeling section 20 is rotated by half rotation of the cam 24 to lower the peeling section 20, the bearing 25 contacts the outer peripheral surface of the recording drum 10, and the peeling claw 2
1 is placed slightly away from its outer peripheral surface (hereinafter referred to as "standby state"). FIG. 6B shows the state at this time. When the peeling unit 20 is moved from the retracted state to the standby state, the image output apparatus of this embodiment does not need to take into consideration the rotational position of the recording drum 10. Because in the standby state, the recording drum 10
Is rotating at a low speed, but the peeling claw 21 is
This is because the film F is slightly separated from 0 and the film can pass between the two, so that the film F is not affected even when the peeling section 20 moves from the retracted state to the standby state.

In the next step S5, as shown in FIG. 7A, the peeling claw 21 starts to intrude into the peeling groove 11. The operation is performed as follows. First bearing 2
5 is a low-speed rotation of the recording drum 10 notch 12
By approaching, the link 22 is slightly lowered about the rotation axis. As a result, the peeling claw 21
At the timing when it approaches the peeling groove 11, it slightly descends and begins to enter the peeling groove 11. As described above, in the image output apparatus of this embodiment, it is not necessary to stop the recording drum 10 again for the positioning process, and the peeling claw 21 can be recessed into the peeling groove 11 at a more accurate timing.

In the next step S6, a film peeling process is performed. As shown in FIG. 7A, one end of the film F (hereinafter referred to as “the tip of the film”) is located above the middle of the peeling groove, and the peeling groove 1 is formed in the previous step S5.
The peeling claw 21 that has begun to incline to 1 peels the film under the film F as the recording drum 10 rotates. The situation at this time is shown in FIG.
8B, FIG. 8A, FIG. 8B and FIG. 9A.
First, as shown in FIG. 7B, the peeling claw 21 approaches the leading edge of the film due to the low speed rotation of the recording drum 10. When the recording drum 10 is further rotated, as shown in FIG.
Is separated from the recording drum 10 along the upper surface of the peeling claw 21,
It starts to be sent to the discharge unit 30 (not shown). Then, as shown in FIG. 8B, even if the bearing 25 passes through the cutout portion 12 and the peeling claw 21 is in a standby state in which it is slightly separated from the outer peripheral surface of the recording drum 10, the peeling claw 21 is already on the film and the recording drum 10. Since the recording drum 10 is positioned between and, the peeling claw 21 continuously peels the film by the low speed rotation of the recording drum 10. When the film is completely peeled off as shown in FIG. 9A, the process of step S6 ends, and the process proceeds to the next step S7.

In step S7, after the film peeling process is completed, the peeling section 20 is lifted to the retracted state. That is, the cam 24 is further rotated a half turn to lift the link 22, and the separating claw 21 and the bearing 25 are completely separated from the outer peripheral surface of the recording drum 10. This completes the film discharge process, and if the next film is to be exposed continuously, the next film is wound around the outer peripheral surface of the recording drum 10 and returns to step S1 again, otherwise the process ends. .

The above is the peeling process of the film of the image output apparatus of this embodiment. As described above, according to the apparatus of this embodiment, by using the cylindrical drum 10 as a cam, the peeling claw 21 can be recessed into the peeling groove 11 at an accurate timing, thereby performing the positioning process. It is not necessary, and quick film peeling processing is possible.

Further, since a large-scale mechanism using a solenoid, a motor, etc. for driving the peeling claw 21 and a sensor for timing control are unnecessary, the accuracy of timing control is not sacrificed, and the apparatus is not required. Can be made compact.

[0047]

[3. Modified Example In this embodiment, as described in step S2 of FIG. 4, the rotation of the recording drum 10 is once stopped due to the control, but it is not an essential step for the peeling process of the film. May be decelerated from high-speed rotation for exposure processing to low-speed rotation without stopping at all. In that case, the effect of shortening the time of the film peeling treatment is further enhanced.

Further, in this embodiment, the notch 12 is provided outside the film winding range on the outer peripheral surface of the recording drum 10, but the film surface is made of a durable material or the material of the bearing 25 is made of a material. If the bearing 25 is made to be soft so as not to be scratched even if the bearing 25 rotates on the surface of the film, or if a film that does not cause any damage to the bearing 25 is used, the notch 12 is formed in the recording drum 10. You may provide in the range which the film of the outer peripheral surface is wound.

Further, in this embodiment, the notch 12 is provided at the same position as the peeling groove 11 when viewed from the central axis direction of the recording drum 10. However, the peeling claw is changed by changing the configuration and shape of the peeling portion 20. If the groove 21 can be slightly lowered at the timing when it reaches the upper portion of the peeling groove 11, the cutout portion 12 has the peeling groove 11 when viewed from the central axis direction of the recording drum 10.
It does not have to be in the same position as.

Further, in this embodiment, the member corresponding to the contact means is the bearing, but the link 22 is formed by transmitting the unevenness due to the notch on the outer peripheral surface of the recording drum 10.
Other objects may be used as long as they can be raised and lowered.

[0051]

As described above, in the apparatus according to the first to third aspects, by using the cylindrical drum as the cam, the lifting and lowering when the guide member passes through the notch is performed by the peeling means through the movable mechanism. Lifting and lowering causes the peeling means to access the edge of the image recording medium. Therefore, the peeling can be started quickly and at a precise timing.

Further, for the multi-step operation of the peeling means,
Since a large-scale mechanism using a solenoid or motor for driving and a sensor for timing control are not required, the configuration is simple and the device can be made compact without sacrificing the accuracy of timing control. .

Particularly, in the apparatus according to the second aspect, since the notch is formed outside the winding width of the image recording medium, the circumferential path through which the guide member passes does not pass over the image recording medium. Therefore, when the guide member comes into contact with and passes over the image recording medium, the image recording medium may be damaged. Therefore, the image recording medium can be prevented from being damaged.

Further, the method according to claim 4 is a method making full use of the feature of automatic positioning in the apparatus according to claim 1 or 2, wherein a cylindrical drum is additionally provided only for positioning the image recording medium with respect to the peeling means. No need to rotate to. Therefore, the high-speed rotation for image recording can be followed by the low-speed rotation for peeling in a short time, and the time for peeling the image recording medium is particularly shortened.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a main part of an image recording apparatus incorporating a peeling mechanism of an embodiment.

FIG. 2 is a partially omitted plan view of the device of FIG.

3 is an enlarged partial side view of the apparatus of FIG.

FIG. 4 is a flowchart showing the operation procedure of image exposure processing and film peeling processing in the apparatus of the embodiment.

FIG. 5 is an operation explanatory diagram of image exposure processing and film peeling processing in the apparatus of the embodiment.

FIG. 6 is an operation explanatory view of the peeling process of the light-sensitive material film in the apparatus of the example.

FIG. 7 is an operation explanatory view of the peeling process of the light-sensitive material film in the apparatus of the embodiment.

FIG. 8 is an operation explanatory view of the peeling process of the light-sensitive material film in the apparatus of the example.

FIG. 9 is an operation explanatory view of the peeling process of the light-sensitive material film in the apparatus of the embodiment.

FIG. 10 is a development view of the outer peripheral surface of the recording drum in the apparatus of the embodiment.

[Explanation of symbols]

10 Recording drum (cylindrical drum) 20 Peeling part 30 discharge section 11 peeling groove 12 Notch 21 Peeling claw (peeling means) 22 links 23 Link rotation axis 24 cams 25 Bearing (guide member) 26 Suppression roller S Recording drum outer peripheral surface F Sensitive material film (image recording medium) P bearing following path (circumferential path)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Iwasa 5 No. 5 Higashikujo Minami-Ishida-cho, Minami-ku, Kyoto City Dainichi Screen Manufacturing Co., Ltd., Jujo Works (56) Reference JP 5-232668 (JP, JP, A) JP-A-6-130632 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03F 1/00-1/16 G03F ⁷ /20-7/24 G03F 9/00- 9/02

Claims (4)

(57) [Claims] 1. A peeling mechanism for peeling the image recording medium from the cylindrical drum after an image is recorded on the image recording medium wound around the outer peripheral surface of the cylindrical drum, wherein a notch portion is formed on the outer peripheral surface of the cylindrical drum. And (a) peeling means for peeling, and (b) a movable mechanism coupled to the peeling means for separating and approaching the peeling means to and from the cylindrical drum, c) the peeling means along the outer peripheral surface of the cylindrical drum by being coupled to the movable mechanism and following the circumferential path passing through the cutout portion of the outer peripheral surface of the cylindrical drum during rotation of the cylindrical drum. And a guide member for guiding the guide member, and the guide member is separated from the image recording medium when the guide member follows other than the cutout portion in the circumferential path, and the guide member is Notch The peeling means moves up and down to access the end portion of the image recording medium as it goes up and down when passing through the section, whereby peeling of the image recording medium from the cylindrical drum is started. Peeling mechanism of image recording medium. 2. The peeling mechanism according to claim 1, wherein the cutout portion is provided outside an outer peripheral surface of the cylindrical drum, the width of which the image recording medium is wound. Media peeling mechanism. 3. A cylindrical outer surface scanning type image recording apparatus incorporating the peeling mechanism according to claim 1 or 2. 4. A method for peeling an image recording medium from a cylindrical drum by using the peeling mechanism according to claim 1 or 2, wherein the peeling means is separated from the cylindrical drum for image recording. Rotating the cylindrical drum at a first speed; decelerating the rotational speed of the cylindrical drum after the image recording is completed, rotating the cylindrical drum at a second speed lower than the first speed; During the rotation at the speed of 2, the step of moving the movable mechanism until the guide member comes into contact with the outer peripheral surface of the cylindrical drum, and the guide member follows the notch formed in the surface of the cylindrical drum. A step of inserting the peeling means between the outer peripheral surface of the cylindrical drum and the image recording medium, and starting peeling of the image recording medium from the cylindrical drum. You Peeling method of an image recording medium.