JPH03216454A - Picture recorder - Google Patents

Abstract

PURPOSE:To efficiently reproduce a fine picture by forming at least one part of a guide member in a curve while providing a sensor, which appears in a recording material of passing through the concerned guide member, and further controlling a conveying speed of the recording material from a recording material supply means by an output signal of the sensor. CONSTITUTION:A recording material supplying roller 14 is rotated by a driving action of a rotary driving source not shown, and a recording material S from a casing 12 is drawn out being directed to guide plates 22a, 22b. Now when the material S is brought into contact with a leaf 25a of a first sensor 24a, a feed out speed of the material S is meant fast, consequently a speed control of the roller 14 is performed by sensors 24a, 24b. In this way, the material S is maintained in a fixed curved condition and held to paired subscanning rollers 18a thereafter held to paired subscanning rollers 18b via the just above a sensor 34. Here the material S, cut by a cutter 16, reproduces picture information or the like under hold-conveying action of the paired rollers 18a, 18b. Now the material S is prevented from being influenced by a shock of cutting action of the cutter 16.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention involves transporting and feeding a recording material such as a sheet-shaped photosensitive material wound into a roll to a predetermined position, and then cleaning the recording surface of the recording material. The present invention relates to an image recording device that avoids the occurrence of image unevenness and reproduces clear and precise images when recording image information by scanning an optical beam or the like.

[Prior Art] In recent years, in the fields of printing and plate making, in order to streamline work processes and improve image quality, image information recorded on a manuscript is optically read and electrically processed to create a film master plate. Image scanning recording systems that create images are becoming popular.

This image scanning reading recording system is mainly composed of an image reading device, a control device, and an image recording device.
The image reading device scans a reflective photo original or line drawing original with a light beam, and converts the optical signal into an electrical signal by introducing the light beam into a photo multiplier or the like via a light guide, or reads the image using a CCD camera. Read information.

In this case, image information carried on the document is converted into an electrical signal depending on the intensity of reflected light, and the electrical signal is used to reproduce the image.

That is, the image information converted into electrical signals in the image reading device is subjected to processing such as gradation correction and halftone separation according to the plate-making conditions by the control device, and the signals related to the processed image information are sent to the image recording device. The laser light modulated by the signal is irradiated along the main scanning direction onto a recording material such as a photosensitive material that is conveyed in the sub-scanning direction, thereby recording an image.

After the image recording is completed, the recording material is subjected to a development process and is finally used as a film original for printing or the like.

In this case, especially when the recording material wound into a roll is subjected to the image recording process, both ends of the portion of the recording material that is scanned by the laser beam are supported by a pair of rollers, and therefore the recording material Usually, a considerable amount of tension is applied between the winding portion of the wire and the winding portion of the wire. That is, it is preferable to record an image while applying tension to the recording material in order to obtain a clear reproduced image.

However, the recording material is cut within a predetermined range, and if the cutter attempts to cut the recording material while tension is applied, a considerable impact may be applied to the recording material or the exposed area during cutting. become. As a result, when scanning a recording material with a light beam, the recording material itself becomes blurred or the light beam becomes blurred, making it impossible to reproduce a satisfactory image.

In order to deal with this kind of inconvenience, ■ an interval of at least one frame or more is provided in advance between the exposure position of the recording material and the cutter, and the impact during cutting is absorbed between the two; The recording material is curved into a loop between the position of the cutter and the shock is absorbed by this relaxed part when cutting the recording material. ■ The nip force of the nip roller that pulls the recording material at the exposure position is made extremely large, Countermeasures have been taken, such as increasing the driving torque so that the impact when cutting the recording material does not reach the exposure position.

[Problems to be Solved by the Invention] However, if the separation distance between the cutter and the sub-scanning roller is set to a long length as in the above-mentioned item (2), there is a problem that the device becomes larger. When the nipper or drive torque of the sub-scanning nip roller is increased as in (2), when the recording material rushes into the nip roller, the conveyance speed of the recording material becomes uneven, and special measures are taken to avoid this unevenness. Is required.

Furthermore, even as a countermeasure for forming a loop (2), it is necessary to prepare a space for the loop, and furthermore, a guide member for forming the loop and a special conveyance control means for forming the loop are also required.

Therefore, an object of the present invention is to provide an image recording apparatus that can supply recording material without impacting the recording material at the exposure position, and thereby can efficiently reproduce precise images. .

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a recording material supply means for feeding a roll-shaped recording material, a cutter for cutting the recording material at a predetermined position, a recording means provided downstream of the cutter to record an image on the recording material being conveyed; and a recording means provided between the recording material supply means and the recording means for supplying the recording material from the recording material supply means to the recording means. a guide member defining a path for guiding and conveying; the guide member having at least a portion thereof curved and a sensor facing the recording material passing through the guide member; The apparatus is characterized in that it has a drive source that controls the conveyance speed of the recording material from the recording material supply means.

[Function] According to the present invention, a conveyance path made of a curved guide member is formed between the roll-shaped recording material supply means and the recording means, and a recording material detection sensor is provided along the path. By defining an appropriate curved portion in the recording material itself passing through the conveyance path, the recording material can be cut into a predetermined length. Therefore, there is no impact on the recording material during cutting, and the exposure process can be started in a short time, making it possible to efficiently record high-quality images.

[Embodiments] Next, preferred embodiments of the image recording apparatus according to the present invention will be described in detail based on the accompanying drawings.

In the figure, reference numeral 10 indicates an image recording device. This image recording device 10 includes a casing 12 that stores a sheet-like recording material S wound into a roll, a set of recording material supply rollers 14 that takes out the recording material S from the casing 12, and a set of recording material supply rollers 14 that take out the recording material S from the casing 12. a cutter 16 for cutting the recording material S to a predetermined length, and a set of sub-scanners for exposing image information, etc. to a light beam while supporting and conveying the recording material S taken out from the casing 12 at the beam irradiation position. It has a pair of rollers 18a and 18b, and an optical system 20 that irradiates the recording material S with a laser beam (light beam).

In the present invention, a pair of guide plates 22a and 22b are provided on the conveyance path of the recording material S from the cutter 16 to the pair of sub-scanning rollers 18a.
The guide plate 22a is curved toward the sub-scanning roller pair 18a arranged above the cutter 16.

In this case, a first sensor 24a and a second sensor 24b as means for detecting the recording material S are disposed on the guide plates 22a and 22b, respectively. In fact, the first sensor 24
a1 second sensor 24b is a swingable leaf 25a, 25
b, and the recording material S moves along this leash 7 due to its conveying action.
It is comprised of a so-called actiniator type photosensor that blocks the optical path by coming into contact with either 25a or 25b.

The optical system 20 includes a laser light source 26, a polygon mirror 28 that reflects the laser light emitted from the laser light source 26, and a first mirror that reflects the laser light reflected by the polygon mirror 28 toward the exposure position. It has a mirror 30 and a second mirror 32. In particular, sub-scanning roller pair 1
A third sensor 34 configured similarly to the first sensor 24a and second sensor 24b is provided between 8a and 18b. That is, the third sensor 34 has a leaf 35, and is configured such that the recording material S that is being supplied and conveyed comes into contact with the leaf 35. Therefore, the optical system 20 is energized and deenergized depending on the presence or absence of the recording material S.

Although not shown, the recording material supply roller 14,
The cutter 16, the sub-scanning roller pair 18a, 18b, and the optical system 20 are each controlled by a control section, and
The control section is mainly composed of, for example, a microcomputer, and performs various controls based on output signals output from the first sensor 24a1, the second sensor 24b, the third sensor 34, and the like.

The image recording apparatus 10 according to the present invention is basically constructed as described above, and its operation will be explained next.

Based on the exposure request signal, the polygon mirror 28 constituting the optical system 20 rotates, and the laser light from the laser light source 26 is reflected by the polygon mirror 28, mirrors 30, and 32, and is sent to the sub-scanning roller pair 18a, 18b. reach the exposure position between. In this case, before the polygon mirror 28 reaches constant rotation speed, the recording material supply roller 14 rotates under the driving action of a rotation drive source (not shown), and the recording material S from the casing 12 is directed toward the guide plates 22a and 22b. It is derived as follows. At this time, the recording material S first passes through the leaf 25 of the first sensor 24a.
If it comes into contact with a, it indicates that the delivery rate is fast.

In other words, this means that the rotational speed of the recording material supply roller 14 is high. Therefore, the first and second sensors 24a
, 24b control the speed of the recording material supply roller 14. That is, in the present invention, it is preferable that the recording material S curves without contacting any of the sensors 24a124b, and by controlling the feed speed of the recording material S, it is possible to maintain a constant curved state.

Next, the recording material S, which has been appropriately curved in this way, is held between the pair of sub-scanning rollers 18a, passes directly above the third sensor 34, and is supported by the pair of sub-scanning rollers 18b. . At this time, since the polygon mirror 28 reaches a constant speed rotation state, the recording material S can be exposed to light. Here, the recording material S is cut into a predetermined length by the cutter 16, and then a laser beam is emitted from the laser light source 26, and this is main-scanned on the recording material S, and the sub-scanning roller pair 18a, 18b is Recording material S under the pinching and conveying action
Image information etc. are played on top. At this time, the impact caused by the cutting action of the cutter 16 does not have any effect on the supported recording material S or the pair of sub-scanning rollers 18a118b. This is because the guide plate 22a122b is curved, so the impact is absorbed there. Then, when the recording material S is cut, the driving of the recording material supply roller 14 is stopped.

As described above, according to this embodiment, the guide plate 22a curved between the cutter 16 and the sub-scanning roller pair 18a,
22b and the respective guide plates 22a, 22b are provided with sensors for controlling the speed of the recording material S fed thereto. Therefore, it is possible to control the conveyance speed of the recording material S itself, and the resulting curvature of the recording material S
Can absorb shock during cutting.

[Effects of the Invention] As understood from the above description, according to the image recording apparatus according to the present invention, the recording material conveyance path from the recording material supply roller to the sub-scanning roller pair is curved in a gentle arc shape. In addition, a sensor is provided along the conveyance path to control the conveyance speed so as to form an appropriate curved portion in the recording material itself, so that the impact when cutting into a predetermined length is not transmitted to the recording position. are doing. Therefore, it is possible to record images at an optimal conveyance speed, and reproduced images without distortion can be efficiently obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a schematic configuration of an image recording apparatus according to the present invention. 10... Image recording device 12... Casing 14... Recording material supply roller 16... Cutter 18a, 18b... Sub-scanning roller pair 20... Optical system

Claims (1)

[Claims] (1) a recording material supply means for feeding a roll of recording material; a cutter for cutting the recording material at a predetermined position; and a cutter for cutting the recording material at a predetermined position; a guide member that is located between the recording material supply means and the recording means and defines a path for guiding and conveying the recording material from the recording material supply means to the recording means; has at least a part thereof curved and is provided with a sensor facing the recording material passing through the guide member, and further has a drive source that controls the conveyance speed of the recording material from the recording material supply means based on the output signal of the sensor. An image recording device characterized by: