JPH09146379A - Sheet peeling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely peel a sheet from a drum, even in a state where the sheet is closely stuck to the drum by forming a hole part through which air flows in the drum at a sucking position, in a peeling means. SOLUTION: An air intake hole 1a is formed at a position on the end part side of the sheet 4. The hole 1a is formed in the very narrow part between electrodes, not to damage them. A suction pad 10 is constituted to suck the sheet 4 in the part of the air intake hole 1a. The suction pad 10 sucks the sheet 4. When the pad 10 is operated so as to attempt peeling the sheet 4, the air is taken in through the intake hole 1a and pushes the sheet 4, so that it is easy to peel the sheet 4 from the drum 1. After that, the sheet 4 is fed by a guiding member. Since the intake hole 1a is formed in the part, where the pad 10 sucks the sheet 4 of the drum 1, the sheet 4 is easily peeled from the drum 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus of the type in which a sheet such as recording paper is wound around a drum and recording is performed on the sheet on the drum, or a sheet such as an original is wound around the drum. The present invention relates to a sheet peeling device for peeling a sheet wound around a drum in a reading device of a type that reads a sheet on the drum.

[0002]

2. Description of the Related Art Conventionally, in this type of device, a sheet wound around a drum is peeled off. Therefore, a plurality of suction pads are provided along the longitudinal direction of the drum so as to face the drum, and these suction pads are arranged. A drive mechanism is provided that moves the drum toward and away from the drum and also reciprocates in the sheet feeding direction.When the sheet on the drum is peeled off, the tip of the sheet on the drum acts as a suction pad. Stop at the opposite position, press the suction pad against the tip of the sheet to suck it, then retract the suction pad to peel the sheet tip from the drum, then rotate the drum and move the suction pad in the sheet feeding direction. The leading edge of the peeled sheet was guided downstream.

[0003]

However, in such a sheet peeling apparatus, there is no problem if the sheet wound around the drum has a fixed size, but peeling is excellent when a large number of sizes are used. There was a problem that I could not do it.

This problem has arisen for the following reasons.
That is, when a plurality of suction pads are provided at equal intervals along the longitudinal direction, depending on the size of the sheet, there is a suction pad that contacts the drum without contacting the sheet,
Therefore, peeling is adversely affected and peeling failure occurs.
In addition, the conventional apparatus requires a plurality of suction pads, and the suction pads must be complicatedly moved, resulting in an increase in cost of the apparatus itself.

The present invention has been made in view of the above-mentioned problems, and is capable of satisfactorily peeling from a drum even if there are many kinds of sheets wound around the drum, and has a simple structure. An object of the present invention is to provide a simple sheet peeling device.

[0006]

In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems and a drum around which a sheet is wound, and a sheet wound around the drum, which is disposed so as to face the drum in the vicinity of the end thereof. And a peeling means for temporarily adsorbing a portion in the vicinity of the side edge of the front end of the drum and peeling it from the drum, and having a structure in which a hole for allowing air to flow is formed in the drum at a position where the peeling means adsorbs. Is.

[0007]

1 is a schematic perspective view showing a sheet peeling apparatus according to an embodiment of the present invention for peeling a sheet from a drum provided in a recording apparatus, and FIG. 2 shows the operation of the sheet peeling apparatus. It is a figure explaining. In addition, the recording apparatus which is the target of this embodiment is a paper having a photosensitive layer on the surface,
This is a type in which an image is recorded by scanning a sheet such as a film with a laser beam. 1 and 2, 1 is a drum, 2 is a support plate for holding the drum 1, and 3 is the drum 1.
A motor 4 for rotating the drum 1 is a sheet of recording paper or film wound around the outer peripheral surface of the drum 1. The drum 1 can hold the sheet 4 by vacuum suction or electrostatic suction. Although illustration is omitted,
A means for feeding and holding the sheet to the drum 1, a recording head for irradiating the sheet 4 wound around the drum 1 with laser light to perform recording, and the recording head is the drum 1
A drive mechanism and the like for moving along is provided. Here, the winding position of the sheet 4 with respect to the drum 1 is the drum 1
One side edge 4a of the sheet 4 is set to match a reference position defined near one end of the sheet (near the end on the front side in FIG. 1), and therefore regardless of the size of the sheet. The side edge 4a of the sheet 4 is positioned at a fixed position with respect to the drum 1.

Reference numeral 6 denotes a sheet 4 wound around the drum 1.
It is a sheet peeling device for peeling and discharging. The sheet peeling device 6 is arranged in the vicinity of the end portion of the drum 1 so as to face it, and peeling means 7 for peeling from the drum 1 a portion near the side edge of the front end 4b of the sheet 4 wound around the drum 1.
A guide member 8 is provided in the vicinity of the drum 1 along substantially the entire length of the drum 1 and has a guide surface 8a for guiding the sheet sent from the drum 1 so as to be separated from the drum. More specifically, the peeling means 7 includes one suction pad 10 that is arranged to face the drum 1.
And a support tool 11 that holds the suction pad 10 movably in a direction substantially perpendicular to the drum 1, and the suction pad 10
Is provided with a solenoid 12 that reciprocates between a position where the sheet 4 on the drum 1 is sucked and held, and a position where a front edge side portion of the sheet 4 is peeled off from the surface of the drum 1. The suction pad 10 is arranged at a position facing the vicinity of the side edge of the sheet 4 wound with the side edge 4a aligned with the reference position of the drum 1, and therefore the sheet 4 wound around the drum 1 is disposed. Of any size, the sheet 4 can be adsorbed and held near the side edge 4a to be peeled off.

The guide member 8 is made by bending a metal plate, and the bent portion 8b is arranged so as to be the tip of the guide surface 8a close to the drum 1.
Further, as can be seen clearly from FIG. 2D, one end of the tip 8b is located in the vicinity of the suction pad 10, and the sheet 4 to be peeled off from the drum 1 by the suction pad 10 is formed.
Is provided at a position capable of supporting a portion near the side edge of the front end 4b, and is further provided so as to be inclined downstream from the one end toward the opposite end in the rotational direction of the drum 1. The tip 8b formed by bending the sheet metal is formed by a smoothly curved curved surface so that the sheet 4 will not be damaged when it comes into contact with it. Further, the guide surface 8a of the guide member 8 is formed in a shape (inclination) so as to guide the sheet 4 slid and guided on the guide surface 8 to the discharge means provided below, for example, a discharge tray (not shown). Has been.

Next, the peeling operation by the sheet peeling device 6 having the above structure will be described with reference to FIG. When the predetermined recording on the sheet 4 wound around the outer peripheral surface of the drum 1 is completed, as shown in FIG. 2A, in the drum 1, a portion near the front end 4b of the held sheet 4 is attached to the suction pad 10. Rotate to the opposite position and stop at that position. Next, as shown in FIG. 2 (b), the suction pad 10 moves forward to come into contact with a portion near the side edge of the front end of the sheet 4 on the drum 1 and suction-holds the portion, and then FIG. 2 (c). As shown in FIG. 3, the suction pad 10 is retracted, and the sheet 4 suction-held is held.
The part near the side edge of the front end of the drum is peeled off from the drum 1. In the case where the drum 1 holds the sheet 4 by vacuum suction, the sheet 4 of the drum 1 is removed before the suction pad 10 peels off the portion near the side edge of the front end of the sheet 4.
The vacuum is cut off in other regions except the region where the rear end portion is vacuum-adsorbed. As a result, the sheet 4 is attached to the suction pad 10
It can be peeled off without any problem. In the case where the drum 1 is configured to hold the sheet 4 by electrostatic attraction, the sheet 4 is also electrostatically attracted when the suction pad 10 peels off the portion near the front edge of the sheet 4. In this case, by setting the suction force of the suction pad 10 to be larger than the electrostatic suction force, the portion near the side edge of the front end of the sheet 4 can be peeled off.

After the suction pad 10 retracts from the drum 1 and the portion near the edge of the front end 4b of the sheet 4 has passed over the tip 8b of the guide member 8, the suction pad 10 is removed.
Then, the suction pad 10 releases the sheet 4. As a result, as shown in FIG. 2D, the front end 4 of the seat 4 is
A portion near the side edge of b is placed on the guide surface 8 a of the guide member 8. Next, as shown in FIG. 2E, the drum 1 rotates in the direction of the arrow, and the sheet 4 is sent out. As a result, the front end 4b of the seat 4 rides on the guide surface 8a along the inclined tip 8b of the guide surface 8a, and finally the entire width of the seat 4 is guided on the guide surface 8a.
While being peeled off from the drum 1, it is sent out toward the discharging means (not shown) below by the guide surface 8a. At this time, since the tip 8b of the guide surface 8a is a smoothly curved curved surface, the seat 4 riding on it is not damaged. After that, when the drum 1 is further rotated, it is peeled off from the surface of the drum 1 by the guide surface 8a up to the rear end of the sheet 4 on the drum 1.
The whole is peeled off from the drum 1 and sent to the downstream discharging means. Thus, the peeling operation is completed.

As described above, the sheet 4 from the drum 1
Is peeled off. Here, the peeling means 7 is simply the sheet 4
Since it suffices to peel off only the portion near the side edge of the front end of the drum 1 from the drum 1, only one suction pad 10 is provided as in the illustrated embodiment, and the suction pad 10 is reciprocated substantially at right angles to the drum 1. Therefore, it has a simple structure and can be manufactured at low cost. The mechanism for reciprocating the suction pad 10 substantially at right angles to the drum 1 is not limited to the case where the suction pad 10 is linearly reciprocated as illustrated, but the suction pad 10 is supported in parallel with the drum axis. Hold it on the tip of the arm that can swing about the axis,
It may be configured to utilize the reciprocating swing of the arm.

The above embodiment is a sheet for peeling a recording sheet from a drum in a recording apparatus of a type in which an image is recorded by scanning a sheet such as paper or film having a photosensitive layer on its surface with a laser beam. Although it is a peeling device, the sheet peeling device of the present invention is not limited to use in this type of recording device, may be used in other types of recording devices, and further, information of the sheet wound on the drum It may be used to strip the sheet from the drum in a read-type reader.

As is clear from the above description, a peeling means such as a suction pad that faces only the vicinity of one end of the drum and peels the portion near the side edge of the front end of the sheet wound around the drum from the drum. A guide member having a guide surface for guiding the sheet fed from the drum to be separated from the drum is arranged near the drum along substantially the entire length of the drum. The adjacent tip is inclined from the position capable of supporting the side edge vicinity portion of the front end of the sheet peeled by the peeling means to the downstream side in the rotation direction of the drum, so that the sheet is separated from the drum surface. When peeling off the sheet, the drum is stopped with the portion near the front end of the sheet facing the peeling means, and the front edge of the sheet on the drum is peeled by the peeling means. Peel off the portion near the side edge to support it on the tip of the guide surface, then rotate the drum to send out the sheet, so that the tip of the sheet is placed on the guide surface along the inclined tip of the guide surface. Then, the entire width of the sheet is finally fed onto the guide surface, and the guide surface guides the sheet so that it can be peeled off from the drum. Regardless of the size of the sheet, good sheet peeling can always be performed. Since only the portion near the side edge at the front end of the sheet needs to be peeled off from the drum, the structure is simple and the cost of the apparatus can be reduced.

If the guide member is made of sheet metal and the tip of the guide surface of the guide member close to the drum is formed by a curved surface of the sheet metal, the sheet is guided by the smooth curved surface. It is possible to obtain an effect that the sheet peeled off from the drum is not damaged.

Further, when the guide surface of the guide member is formed to guide the sheet to the discharging means, the single guide member performs two functions of separating the sheet from the drum and guiding the sheet to the discharging means. It is possible to obtain the effects that the device configuration can be simplified, and the cost can be reduced.

Incidentally, if the sheet is simply sucked by the suction pad 10, the peeling may fail.
This is because the drum 1 and the sheet 4 are in close contact with each other, so that the sheet 4 cannot be adsorbed completely. The solution to this is described below.

FIG. 3 is a perspective view showing the drum 1 having an air introduction hole formed at a position where the suction pad 10 sucks the sheet 4. FIG. 4 shows the electrostatic attraction plate wound around the drum 1. As shown in FIG. 4, the air introduction hole 1a is formed at a position where the end portion of the sheet is located, and is formed in a very narrow portion between the electrodes 1b so as not to damage the electrodes. The electrode 1b is slightly narrowed in the vicinity of the air introduction hole 1a (the non-electrode portion is widened), and the air introduction hole 1a
It is easy to form a. Hereinafter, the operation of peeling off the sheet 4 is shown in FIGS.

As shown in the figure, the suction pad 10 is configured to suck the sheet 4 in the air introduction hole 1a (FIG. 5 (a)), and the suction pad 10 sucks the sheet (FIG. 5). (B)) Then, when the suction pad 10 operates so as to peel off the sheet 4, air is introduced from the air introduction hole 1a, and the air pushes the sheet 4, so that the sheet 4 is easily peeled off from the drum 1 (Fig. 5 (c), thereafter, the sheet 4 is sent out by the guide member 8.

In this way, the air introduction hole 1a is connected to the drum 1
The sheet 4 is easily peeled off from the drum 1 by forming it on the portion where the suction pad 10 is sucked.

[0021]

As is apparent from the above description, according to the present invention, since the hole for allowing air to flow is formed in the drum at the position where the peeling means adsorbs, even if the drum and the sheet are in close contact, The sheet can be reliably peeled off the drum.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a sheet peeling device according to an embodiment of the present invention for peeling a sheet from a drum provided in a recording device.

2A and 2B are diagrams for explaining the operation of the sheet peeling apparatus shown in FIG. 1, in which FIG. 2A is a schematic side view and a front view showing a state immediately before peeling a sheet, and FIG. A schematic side view and a front view showing a state of being brought into contact with the seat,
(C) is a schematic side view and front view showing a state in which a portion near the side edge of the front end of the sheet is peeled off by the suction pad, and (d) shows that the suction pad releases the sheet and guides the portion near the side edge of the front end of the sheet. FIG. 3E is a schematic side view and a front view showing a state in which the sheet is placed on a surface, and FIG.

FIG. 3 is a perspective view showing that an air introduction hole is formed in the drum.

FIG. 4 is an explanatory diagram of an electrostatic attraction plate wound around a drum.

5A is a schematic cross-sectional view before peeling the sheet. FIG. 5B is a schematic cross-sectional view showing that the sheet is adsorbed from above the air introduction hole. C. Peeling the sheet by air from the air introduction hole. Cross-sectional view showing that

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 drum 1a air introduction hole 3 motor 4 sheet 4a side edge 4b front end 6 sheet peeling device 7 peeling means 8 guide member 8a guide surface 8b tip 10 suction pad 12 solenoid

Claims (3)

[Claims] 1. A drum around which a sheet is wound, and a drum which is disposed in the vicinity of an end portion of the drum so as to face each other and temporarily sucks a portion near a side edge of a front end of the sheet wound around the drum to separate the sheet from the drum. A sheet peeling apparatus, comprising: a peeling unit, wherein a hole for allowing air to flow is formed in a drum at a position where the peeling unit adsorbs. 2. A guide member, which is disposed in the vicinity of the drum along substantially the entire length of the drum and has a guide surface for guiding a sheet sent from the drum so as to speak from the drum. The front end of the drum adjacent to the drum is provided so as to be inclined to the downstream side in the rotation direction of the drum from a position capable of supporting the vicinity of the side edge of the front end of the sheet peeled by the peeling means. The sheet peeling device according to claim 1. 3. The sheet peeling device according to claim 1, wherein the holes are formed between the electrodes of the drum.