JPH0116096Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drum-type image scanning recording device such as a color scanner for plate making, and particularly to a device for mounting a recording photosensitive film on a recording drum.

[Prior Art] In drum-type image scanning recording devices such as color scanners for plate making, photographic film is generally used as a photosensitive material for recording duplicate images. Both the starting and ending sides (both sides parallel to the drum axis) of the film are required to be mounted at predetermined positions on the circumference of the drum, and the duplicated image is required to be recorded at a predetermined position within the film. If the beginning and end of the film are not installed at the specified positions on the circumference of the recording drum, part of the reproduced image may protrude from the film and become unusable. However, this causes the film to be displaced from the suction hole or slit for holding the film, resulting in a problem that the film becomes unstable.

Conventionally, the following measures have been applied to meet this requirement.

FIG. 4 shows an example of the most basic positioning and mounting means using positioning pins, in which at least two positioning pins 2, 2...
... are erected, and on the other hand, a plurality of punch holes 4, 4 are provided at appropriate positions near the tip of the film 3 to engage with the pins 2.
... are provided, and by fitting these punch holes 4 to the pins 2, the film 3 is aligned and mounted at a desired position.

Next, FIG. 5 shows a system in which the relative position between the recording side drum 5 and the film 8 is automatically regulated. A pair of feed rollers 6, which are equipped with a photo sensor 7 that photoelectrically detects their presence and are driven by a drive means (not shown),
6 feeds the film 8 toward the mounting portion of the drum 5, and the photo sensor 7 detects the leading edge of the film 8 and generates a signal to start the rotation of the drum 5, thereby placing the film 8 on the drum 5. It is designed to be installed by winding it.

FIG. 6 is similar to the means shown in FIG. 5, but the photo sensor 7 is arranged at a distance "l" away from the position where the leading end of the film is mounted on the film feeding side, and on the other hand. The feed roller 6 is equipped with a rotation amount detection means 9 such as a rotary encoder, and after the photo sensor 7 detects the leading edge of the film 8, the feed roller 6 is driven for a distance corresponding to "l". After that, the rotation of the drum 5 is started, and the film 8 is wound around the drum 5.

[Problems to be solved by the invention] The following problems are pointed out in each of the above-mentioned conventional means.

First, the mounting method using positioning pins shown in FIG. 4 has many difficulties when working in a dark room where photosensitive films are handled. In other words, aligning punch holes punched in the film with positioning pins is mainly applied to manual mounting, whereas automatic film mounting requires a complicated device configuration, resulting in cost and operational reliability. There are problems with these points. Also, although this method is easy in a bright place, it requires a great deal of care and skill in a dark room under a safelight with low illuminance.

Next, although the means shown in FIGS. 5 and 6 are capable of automatically feeding the film, positioning it, and mounting it, the means shown in FIG. Therefore, it is not suitable for manual loading.In addition, in order to accurately control the film feeding position, a brake device is installed so that the feeding roller 6 stops immediately when a detection signal from the photo sensor is generated. It is necessary to attach the device, which again has the drawback of increasing costs.

Further, the means shown in the sixth figure has similar problems, such as the need to attach a drive device to the feed roller and the need to use a rotary encoder to control the feed amount.

[Means for solving the problem] The present invention utilizes a squeegee roller to tightly wrap the film around the outer periphery of the recording drum, and brings the squeegee roller into close contact with the outer surface of the drum when mounting the film. Then, advance the film placed on the feeding guide plate, press the leading edge of the film against the contact area between the squeegee roller and the drum, and then advance the rear part of the film a required distance to remove the film from the guide plate surface. The device is slightly curved and lifted up, and a sensor switch placed above is activated to start the drum and rotate it at a low speed, which feeds the film and attaches it to a predetermined position.

The drum has a hollow structure connected to a vacuum source, and is provided with suction holes or slits for suctioning and holding the leading edge of the film and the entire film. Attach the winding.

[Function] The leading edge of the film fed manually or automatically is pressed against the abutting part of the drum and squeegee roller, and the rear part of the film is moved forward, thereby curving upward from the guide plate and pushing the switch. to start the rotation of the drum.

[Embodiment] FIG. 1 is a schematic side view of an apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic plan view of the same apparatus.

Drum 10 on which recording film 21 is mounted
has a hollow structure, and has a plurality of suction holes 11 or suction slits arranged in the axial direction for holding a film in its cylindrical surface, and has a tubular rotating shaft 1.
2, it is rotatably supported. Rotating axis 1
2 is connected to a vacuum source (not shown), which evacuates the inside of the drum 10 as shown by arrow A in FIG. 2, and sucks air through the suction holes 11. The suction holes 11 are provided at necessary locations on the outer peripheral surface of the drum 10 in addition to the locations shown in the figure.
There are many.

A pulley 13 is fixed to the rotating shaft 12, and a belt 15 is installed between the pulley of the motor 14 and the drum 10 to rotate.

A rotary encoder 16 that is driven in synchronization with the drum 10 is attached to the opposite side of the rotating shaft 12. This outputs a pulse signal at fixed angle intervals corresponding to the rotation angle of the drum 10, and in image scanning recording devices such as color scanners for plate making, it is used to set the magnification of a duplicate image, control the recording position of the image, etc. Although this is installed as standard for this purpose, in the present invention, this is also utilized for positioning the film on the drum 10.

A squeegee roller 17 is rotatably supported above the drum 10 by a support means (not shown), and is configured to move up and down between a position in close contact with the outer surface of the drum 10 and a position away from it. This squeegee roller 17 can rotate freely, and when it comes into contact with the drum 10, the squeegee roller 17
Rotates according to 0.

On the other hand, a guide plate 18 for feeding the film is installed in the direction of the cutting line of the drum 10 at the contact portion of the squeegee roller 17. This guide plate 18 has a guide piece 1 in the film feeding direction on one side edge.
9 is set up. The guide piece 19 can also be structured to be slidable left and right so that the position of the drum 10 in the axial direction can be adjusted as necessary.

Further, a switch 20 is disposed above the guide plate 18 near the contact portion of the squeegee roller 17. This switch 20 outputs a signal when the film 21 to be fed comes into contact with it, causing the drum 10 to rotate at a required low speed.

FIG. 3 shows how to mount a film using the apparatus constructed as described above.

Figure A shows a preparation state, in which the squeegee roller 17 is separated from the drum 10, and the drum 10 is connected to the attached rotary encoder 1.
6, the suction hole 11 is stopped at the position shown in the figure, that is, at a position slightly deviated toward the film feeding side from the point of contact with the squeegee roller 17.

When mounting the film, first, the squeegee roller 17 is lowered and brought into close contact with the outer peripheral surface of the drum 10. In this state, the film 21 to be loaded is placed on the guide plate 18, and the drum 10 is positioned along the guide piece 19 in the axial direction and fed.
The leading end of the film 21 is brought into contact with the contact portion between the drum 10 and the squeegee roller 17. When the film 21 is further advanced in the feeding direction, the leading end is stopped by the contact portion between the drum 10 and the squeegee roller 17, so the film 21 curves upward and lifts up, and the switch 20 disposed at that position Contact the contact point to activate it and output a signal.

When this signal is input to the control circuit and the vacuum source is started, the inside of the drum 10 is evacuated, the suction holes 11 locally adsorb the film 21, and then the motor 1
4 is activated to rotate the drum 10 in the direction of the arrow B shown in the first figure. The rotation in this case is made sufficiently slower than during normal scanning recording. In addition, it is desirable that the drum 10 be configured to automatically stop when it has made approximately one rotation. This can be carried out by counting the required number of output pulses from the rotary encoder 16 attached to the drum shaft 12.

As the drum 10 rotates, the film 21, which had been curved due to its tip being restrained, is rotated by the drum 10.
and the squeegee roller 17, and is fed in following the drum 10. At this time, the leading end of the film 21 is held on the outer surface of the drum 10 by the suction force of the suction hole 11, and as it is fed, it is also suctioned to other suction holes,
is wrapped around it and placed in the desired position.

Once the desired length of film 21 has been loaded, the squeegee roller 17 is separated from the surface of the drum 10 using a suitable clamp attached to the drum 10 (not shown as it is a well-known means commonly used in plate-making color scanners, etc.). Manually or automatically raised to the desired position, the required scanning exposure recording is performed.

[Effects of the Invention] (1) The position of the film relative to the recording-side scanning drum can be reliably regulated and mounted.

(2) Squeegee rollers, encoders, etc. are standard equipment in image scanning recording devices such as color scanners for plate making, and can be implemented with just an inexpensive contact switch and a simple modification of the electric circuit. can do.

(3) Applicable to devices that feed the film either automatically or manually.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of an embodiment of the device of the present invention;
FIG. 2 is a schematic plan view of the same device, FIG. 3 is an explanatory diagram of the operation of the same device, and FIGS. 4 to 6 are diagrams each illustrating conventional means. 1...Recording side drum, 2...Positioning pin, 3
... Film, 4 ... Punch hole, 5 ... Recording side drum, 6 ... Feed roller, 7 ... Photo sensor, 8 ... Film, 9 ... Encoder, 1
0... Recording side drum, 11... Suction hole, 12...
Rotating shaft, 13... Pulley, 14... Motor, 1
5...Belt, 16...Rotary encoder,
17... Squeegee roller, 18... Guide plate,
19... Guide piece, 20... Detection switch, 21
...Film.

Claims (1)

[Claims for Utility Model Registration] (1) A hollow cylindrical product rotatably supported around a central axis, having a plurality of suction holes or suction slits arranged in an axial direction and opening at least in a part of the outer peripheral surface. a drum on which a recording film is wound and mounted; a vacuum source for evacuating the inside of the drum and suctioning and holding the film wound around the suction hole or suction slit; a drive means for rotating; a squeegee roller that is rotatably supported parallel to the drum shaft and moves between a position in contact with the outer peripheral surface of the drum and a position away from it; and a squeegee roller for moving the squeegee against the drum; a detection switch that is actuated by detecting the curved portion when the film fed toward the roller contact position contacts the squeegee roller and the drum set at the contact position and curves; A recording film mounting device for a drum-type image scanning and recording apparatus, comprising a control means for controlling the driving means in accordance with a signal to rotate the drum in a film feeding direction. (2) The drum according to claim (1) of the utility model registration claim, characterized in that a guide plate is attached toward the contact position between the drum and the squeegee roller to guide the transfer of the film to be loaded. A recording film mounting device for a type image scanning recording device. (3) A utility model characterized in that, when mounting the film, the drum is stopped at a position where the portion of the drum with the suction holes or slits is slightly deviated toward the film feeding side from the contact portion of the squeegee roller. A recording film mounting device for a drum-type image scanning and recording device according to registered claim (1). (4) A recording film in a drum-type image scanning and recording device according to claim (3) of the utility model registration, characterized in that the stop position of the drum is controlled by the output of a rotary encoder attached to a rotating shaft. mounting device. (5) A recording film in a drum-type image scanning and recording device according to claim (1) of the utility model registration, characterized in that the rotation of the drum is driven at a relatively low speed by a signal from a detection switch. mounting device.