JP2978992B2 - Sheet peeling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet peeling device, and more particularly to a sheet peeling device for peeling a sheet adhered to a drum from a drum peripheral surface. You.

[0002]

2. Description of the Related Art Generally, in a drum type image scanning and recording apparatus such as a color scanner for plate making, a photosensitive film is used as a photosensitive material for recording a duplicate image. The film is wound in a state of being pressed against the peripheral surface of the drum by a tip pressing means or the like, is attached to a predetermined position on the peripheral surface of the drum, and a duplicate image is recorded on the film by scanning exposure based on an image signal.

[0003] The film on which recording has been completed is peeled off from the drum peripheral surface. In this case, in the related art, the front end pressing member that presses the front end of the film hinders (obstructs) the peeling of the film, so that it is inevitably peeled from the rear end of the film.

[0004]

However, in the case where the film adhered to the drum is peeled from the rear end, the drum must be rotated in the reverse direction with respect to the winding direction of the film, and a reverse rotation mechanism is required for that. At the same time, since the winding length is different depending on the type of the film used, the rear end position of the film is not constant, so that the mechanism for setting the position where the film is peeled off from the rear end becomes complicated and cannot be said to be a practically appropriate method. .

[0005] In order to separate the film from the leading end, there is a concept of retracting the leading end holding member in the drum peripheral surface in a state of being buried, but this method also complicates the structure and unnecessarily increases the manufacturing cost. Problem. The present invention is proposed in view of the above problems,
The purpose is to have a structure that retreats the tip holder into the drum peripheral surface without peeling off the film from the leading edge without choosing a practically inappropriate method such as peeling the film from the trailing edge. Instead, it is an object of the present invention to provide a sheet peeling device capable of effectively peeling the film from the leading end by simply releasing the pressing operation of the leading end pressing means of the film.

[0006]

According to the present invention, there is provided a tip holding means for pressing a tip of a sheet member against a peripheral surface of a drum, a peeling claw for releasing the sheet member from the peripheral surface of the drum.
When the drum rotates to a position where the leading end pressing means reaches the sheet body peeling position, the pressing release means for releasing the holding of the leading end pressing means, and the leading end pressing means in contact with the sheet body near the leading end pressing means. A sheet sliding means driven in synchronization with the pressing release operation to slide the leading end of the sheet body rearward from the leading end pressing means, and a drum periphery between the leading end pressing means and the sheet leading end when the sheet body is slid by the sliding means. Peeling claw driving means for driving the peeling claw so as to come into contact with the surface, the drum is normally rotated while the peeling claw is in contact with the drum peripheral surface, and the sheet body is peeled from the drum peripheral surface. It is a feature.

[0007]

According to the above construction, when the sheet body adhered to the drum is peeled, the pressing operation of the leading end pressing means is released by the pressing release means at the sheet body peeling position, and the sheet body is moved by the sliding means. Then, the peeling claw is brought into contact with the peripheral surface of the drum, and the sheet adhered to the peripheral surface of the drum is peeled off from the leading end by the normal rotation of the drum.

[0008]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a plate making color scanner to which a sheet peeling device of the present invention is applied, and FIG. 2 is a plan view thereof. (Overall Configuration) A color scanner according to the present embodiment includes a drum 1 on which a photosensitive film F as a sheet is attached, and an upstream side in the rotation direction of the drum 1 (that is, the film
And the film supply unit 2 for supplying the unexposed film F, and the downstream side in the rotation direction of the drum 1 (that is, the advance side of the film F wound around the drum 1), and the drum peripheral surface. Exposure means 3 having exposure head 3a facing 1a
A tip pressing means 10 disposed on the drum peripheral surface 1a;
It is composed of the rear end pressing means 20 and the squeegee unit 40.

(Structure of Film Supply Unit 2) The film supply unit 2 has a magazine 2c for storing a roll film F.
The supply roller 2b is provided in the opening 2a, and the sensor 4 for detecting the leading end of the film F and the film F are cut to a predetermined length on the downstream side in the flow direction of the film F with respect to the supply roller 2b. The cutter 5 is provided.

(Structure of Drum 1) The drum 1 is formed in a hollow cylindrical shape having a relatively large diameter. A plurality of grooves 1c (FIG. 2) are The drum 1 is closed at both ends by a flange-shaped side plate 1b. As shown in FIG. 2, one end of the shaft of the drum 1 is connected to a pulse motor 6 via a coupling, and a notched disk 7 is provided at the other end, which rotates synchronously with the drum 1. The sensor 8 reads the notch 7 so as to detect the origin A (reference position) of the drum 1 and use the detected position for mounting the film F on the drum 1.

Here, the origin A means a position where the tip pressing means 10 exists near the contact point between the flow direction of the film F and the drum peripheral surface 1a as shown in FIG. (Configuration of tip holding means 10)
As shown in FIG. 2, a swing arm 10b that swings up and down in conjunction with the rotation of a first eccentric cam 30, which will be described later, and a plurality of tip holding members fixed at intervals to a base shaft 10c of the swing arm 10b. 10d and a base shaft 10c of the swing arm 10b.
A bearing 10e which is provided on the drum peripheral surface 1a to rotatably support the base shaft 10b; and a spring 10 which presses the tip holding member 10d against the drum peripheral surface 1a.
As shown in FIG. 3, a stopper 10h, such as a rubber sheet, is attached to a surface of the tip holder 10d facing the drum peripheral surface 1a, as shown in FIG.

(Structure for Driving the Tip Holder) As shown in FIG. 4, the tip holder 10 shown in FIG. 3 is in close contact with the drum peripheral surface 1a.
As a mechanism for separating d from the drum peripheral surface 1a, first and second eccentric cams 30 and 31 are provided on the frame 9 so as to be driven via the transmission mechanism 11a, and the pressing is released by the second eccentric cam 31. Means.

As shown in FIG. 4, the first eccentric cam 30
Is driven by the motor 11 via the transmission mechanism 11a when the tip pressing means 10 is at the origin A position of the drum 1, engages the high position peripheral surface of the eccentric cam 30 with the swing arm 10b, and sets the elasticity of the spring 10f. The leading end holding member 10d is lifted against the force to open the inlet side 10g and sandwich the leading end of the supplied film F.

The second eccentric cam 31 as the press release means is driven in conjunction with the motor 11 via the transmission mechanism 11a when the front end press means 10 is at the position B where the film F is released. The surface is engaged with the swing arm 10b to lift the tip holding member 10d against the elastic force of the spring 10f, open the entrance side 10g, and release the tip of the pressed film F. .

The two eccentric cams 30 and 31 are linked to the same drive source (motor) 11 via a transmission mechanism 11a having a one-way clutch 11b.
The first eccentric cams 30 and 31 are driven at the time of one forward rotation, and only the eccentric cam 31 at the time of reverse rotation of the motor 11 is driven. When both the eccentric cams 30 and 31 are in a stationary state, the stationary position is controlled by the operation of a joint sensor (not shown) so that the respective high position peripheral surfaces cannot be engaged with the swing arm 10b. It is made as follows.

(Structure of Rear End Pressing Means 20) The rear end pressing means 20 is, as shown in FIGS.
A rear end holding member having a predetermined width parallel to the axial direction of the drum 1 and having a uniform length in the axial direction, at a position downstream of the leading end pressing means 10 with respect to the drum rotation direction. 20a, and a support plate 20c having one end connected to both ends of the rear end holding member 20a and the other end swingably supported by the drum side plate 1b via a long hole. Further, as shown in FIG. 5, it is constituted by a tension spring 20e hung on the support plate 20c and the drum side plate 1b, and a triangular cam 20d engaged with a square window hole 20b opened in the center of the support plate 20c. I have.

FIGS. 5 to 8 show the operation state of the rear end pressing means 20. FIG. The triangular cam 20d is configured to make about one rotation in conjunction with the motor 11 via the coupling 20g based on a signal from the pulse motor 6 when the drum 1 makes about one rotation while winding the film F. I have. First, the rear end holding member 20a is always pressed against the drum peripheral surface 1a by the elastic force of the tension spring 20e, and the rear end pressing member 20a is rotated by about 1/4 of the rotation of the triangular cam 20d. Is separated from the drum peripheral surface 1a against the elastic force of the spring 20e (FIG. 5), and the film F is rotated by the next rotation (about 1/4 rotation) of the triangular cam 20d.
The rear end holder 20a is moved over the rear end of the cam (FIG. 6), and the next rotation transition of the triangular cam 20d (about 1/4 rotation)
Then, the rear end of the film F is pressed against the drum peripheral surface 1a by the rear end holding member 20a (FIG. 7).

Then, the rotation of the triangular cam 20d (about 1/4 rotation) continues along the drum peripheral surface 1a while pressing the rear end of the film F against the drum peripheral surface 1a with the rear end holding member 20a. The pressing movement means 35 is configured to act in the direction in which the film F is tensioned (that is, the rear end pressing means 20 moves from the position shown in FIG. 7 to the position shown in FIG. 8).

As described above, the film F can be attached to the drum 1 by pulling the film F by operating the rear end holding member 20a. FIG. 9 shows the movement trajectory of the rear end holding member 20a in the operation states of FIGS. (Structure of the squeegee unit 40) On the downstream side in the rotation direction from the origin A position of the drum 1, as shown in FIGS. A queuing unit 40 is provided.

The squeegee unit 40 has a base supported by the frame 9 so as to swing by operation of a solenoid 40s, and includes a squeegee roller 40a and a peeling claw 45. The squeegee roller 40a is connected to the drum 1
Is formed in a small-diameter columnar body having a length approximating the axial length of the squeegee unit 40, and is rotatably supported by the free end of the squeegee unit 40 in parallel with the axial direction of the drum peripheral surface 1a. The squeegee roller 40 is configured to come into contact with and separate from the drum peripheral surface 1a by the swing operation of the squeegee unit 40. When the squeegee roller 40 contacts the drum peripheral surface 1a, the squeegee roller is driven by the rotation of the drum peripheral surface 1a. The film F is interposed between the drum peripheral surface 40a and the drum peripheral surface 1a to suppress the floating of the film F wound around the drum peripheral surface 1a.

At one end of the shaft of the squeegee roller 40a, a disc-shaped roller 4 having a diameter larger than that of the squeegee roller 40a is provided.
0b is integrally fixed. The peripheral surface of the roller 40b is configured to be engageable with the peripheral surface of the second eccentric cam 31 for releasing the pressing operation of the tip pressing means 10,
When the second eccentric cam 31 rotates in the direction of the arrow in FIG.
The peripheral surface of the roller 40b is engaged with the high-peripheral peripheral surface of the second eccentric cam 31 to rotate in the reverse direction with respect to the winding direction of the film F. The film F is slid by applying resistance to relax the close contact with the drum peripheral surface 1a. The squeegee roller 40a corresponds to a slide unit.

The peeling claw 45 is driven by a solenoid 45b as a peeling claw driving means for operating the peeling claw.
The peeling claw 45 has a groove 1c formed on the drum peripheral surface 1a.
And the base is connected to one coaxial shaft 45a.
The shaft 45a is rotatably supported on the frame body of the squeegee unit 40, and the free end swings around the shaft 45a by the operation of the solenoid 45b. When the peeling claw 45 swings toward the drum peripheral surface 1a, a plurality of grooves 1c having free ends formed on the drum peripheral surface 1a.
And the peripheral surface 1 of the drum 1
The film F wound around a is peeled off so as to be scooped up on the back surface of the peeling claw 45.

(Step of winding and peeling film F) Next, the step of winding the film F around the drum 1 is performed in the order shown in FIGS. More specifically, the sensor 8 detects the notch position of the notch disk 7 shown in FIG.
0 is positioned at the origin A (reference position) (see FIGS. 10 and 11), and then the first eccentric cam 30 rotates in the direction of the arrow as shown in FIG.
Is swung upward to lift the tip holding bracket 10b to open the inlet side 10g.

Then, the unexposed film F stored in the film supply section 2 is fed out by the supply roller 2b, and its leading end is detected by the film detection sensor 4, and stops after a certain time from the detection (see FIG. 12). Then, as the first eccentric cam 30 continues to rotate, the swing arm 10b separates from the high position of the first eccentric cam 30 and moves downward as shown in FIG. 3, and the front end holding member 10d closes the inlet side 10g. The leading end of the film F is sandwiched, and the leading end of the sandwiched film F is pressed and fixed to the drum peripheral surface 1a (see FIG. 13).

Thereafter, the drum 1 is rotated by the pulse motor 6 to wind the film F around the drum peripheral surface 1a. At this time, the squeegee roller 40a is retracted from the peripheral surface 1a of the drum 1 and does not hinder the passage of the tip pressing means 10. When the front end pressing means 10 passes the position of the squeegee roller 40a, the solenoid 40s is operated by controlling the number of pulses supplied to the pulse motor 6 to lower the squeegee unit 40, and the peripheral surface of the squeegee roller 40a is moved to the drum peripheral surface 1a.
To prevent the film F from floating (see FIG. 14).

When the drum 1 has made one rotation to the origin A (reference position of the tip pressing means 10), the rotation of the drum 1 is temporarily stopped, and the film F is cut into a predetermined amount by the cutter 5. At this time, the rear end of the film F cut is a squeegee roller 4
0a on the drum peripheral surface 1a separated by a certain distance (see FIG. 15). Then, the coupling 20g is turned on (connected) by a signal from the pulse motor 6 when the drum 1 has made one rotation, and the triangular cam 20d is rotated by the motor 11 via the power transmission mechanism 11a by the motor 11 as shown in FIG. By this pivoting operation, together with the support plate 20c, the rear end holding member 20a is lifted to sandwich the rear end of the film F, and the rear end holding member 20a is tilted forward as shown in FIG.
Then, the rear end of the film F is pressed against the drum peripheral surface 1a.

Further, the rotation of the triangular cam 20d causes the rear end pressing means 20 to shift to the state shown in FIG. At this time, the rear end holding member 20a tensions the film F against the front end pressing means 10 along the drum peripheral surface 1a while pressing the rear end of the film F against the drum peripheral surface 1a by the action of the spring 20e (FIG. 16). Then, the film F
Is uniformly and tightly wound on the drum peripheral surface 1a.

After the film F having the desired length is wound around the drum peripheral surface 1a, the squeegee unit 40 is raised and the squeegee roller 40a is moved to the drum peripheral surface 1a as shown in FIG.
The exposure head 3a performs scanning exposure recording based on the image signal on the film F wound around the drum peripheral surface 1a while being separated from the drum a. Next, a step of peeling the film F from the drum 1 is performed in the order shown in FIGS.

The film F on which the scanning exposure recording has been completed is separated from the drum peripheral surface 1a. In this case, the drum 1 is stopped when the front end pressing means 10 is at the film peeling position B (that is, the position of the second eccentric cam 31 constituting the pressing releasing means K), and the squeegee roller 40 as the sliding means is stopped.
a is brought into close contact with the drum peripheral surface 1a (see FIG. 18).

Then, the second eccentric cam 31 serving as the pressing release means K is rotated in the direction of the arrow, and the swinging arm 10b is again moved up as shown in FIG. 4 to lift the tip pressing fitting 10d to open the inlet side 10g. The squeegee roller 40a reversely strokes the surface of the film F by releasing the front end pressing of the film F and engaging the high peripheral surface of the second eccentric cam 31 with the peripheral surface of the roller 40b.
To relieve the close contact of the film F (see FIG. 19).

As described above, the drum peripheral surface 1
The film F, which has lost the tension on “a”, separates the leading end of the film F from the leading end holding member 10 a by the operation of the trailing end holding means 20. The film 45 wound around the drum peripheral surface 1a is forcibly forced on the rear surface of the peeling nail 45 by rotating the drum 1 by causing the peeling claw 45 to enter the groove 1c of the drum peripheral surface 1a by the solenoid 45b. (See FIG. 20).

The peeled film F is forcibly conveyed by a discharge roller 50 at a downstream position in the film flow direction and is supplied to a developing device (not shown) (see FIG. 21).
In the present embodiment, the squeegee unit 40 is provided with a squeegee roller 40a as a sliding means. However, as another example, a brush body that slides on the upper surface of the film F, a resistance plate, or the like is used. The configuration of the slide means is not particularly limited without departing from the scope of the present invention.

[0033]

As described above, the present invention uses an improper method such as reversing the motor to peel off the sheet from the rear end of the film when peeling off the sheet attached to the drum. Without the need for a complicated structure for retracting the front end holding member into the drum peripheral surface, and by the cooperative operation of the pressing release means and the sliding means, the sheet can be smoothly and reliably moved from the front end of the sheet body. The sheet body can be peeled off from the peripheral surface of the drum, and there is an effect that an apparatus for peeling off the sheet body which does not have a risk of soiling the image of the sheet body recorded by duplication can be manufactured at low cost with an appropriate configuration.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a plate-making color scanner equipped with the present invention.

FIG. 2 is a schematic plan view of a plate-making color scanner equipped with the present invention.

FIG. 3 is a side view showing an operation state when the tip pressing means is pressed.

FIG. 4 is a side view showing an open state of the tip pressing means.

FIG. 5 is a side view showing an operation state of the rear end pressing means.

FIG. 6 is a side view showing an operation state of the rear end pressing means.

FIG. 7 is a side view showing an operation state of the rear end pressing means.

FIG. 8 is a side view showing an operation state of the rear end pressing means.

FIG. 9 is a diagram showing an operation locus of a rear end pressing means.

FIG. 10 is a main part side view showing a film winding step.

FIG. 11 is a main part side view showing a film winding step.

FIG. 12 is a main part side view showing a film winding step.

FIG. 13 is a main part side view showing a film winding step.

FIG. 14 is a main part side view showing a film winding step.

FIG. 15 is a main part side view showing a film winding step.

FIG. 16 is a main part side view showing a film winding step.

FIG. 17 is a side view of a main part showing a film winding step.

FIG. 18 is a main part side view showing a film winding step.

FIG. 19 is a main part side view showing a film winding step.

FIG. 20 is a side view of a main part showing a film winding step.

FIG. 21 is a side view of a main part showing a film winding step.

[Explanation of symbols]

 1 Drum 1a Drum peripheral surface 45 Peeling claw

Claims (1)

(57) [Claims] A first pressing means for pressing the front end of the sheet member against the peripheral surface of the drum; a separating claw for separating the sheet member from the peripheral surface of the drum; and the drum rotating until the front pressing means reaches the sheet separating position. At this time, pressing release means for releasing the pressing of the front end pressing means, and driven in synchronization with the pressing release operation of the front end pressing means in contact with the sheet body near the front pressing means,
A sheet body sliding means for sliding the front end of the sheet body backward from the front end pressing means, and when the sheet body is slid by the sliding means,
Peeling claw driving means for driving the peeling claw so as to contact the drum peripheral surface between the leading end pressing means and the sheet leading end, wherein the drum is normally rotated while the peeling claw is in contact with the drum peripheral surface,
A sheet body peeling device characterized in that a sheet body is peeled from a drum peripheral surface.