JPS62280064A - Scanning head guide construction - Google Patents

Abstract

PURPOSE:To prevent a scanning head from being levitated, by fitting the scanning head to an elongate body fitted over a pair of pulleys, under the condition where the elongate body is in offset condition relative to a free condition in which the head is not fitted thereto. CONSTITUTION:When a photosensitive material 16 drawn out from a magazine 14 is wound around a rotary drum 20 after being cut by a cutter 18, the drum 20 is rotated at high speed, and an exposure head 22 starts exposure using light-emitting elements 48. Simultaneously, pulleys 56, 58 causes the exposure head 22 to move in a sub-scanning direction, whereby a surface for exposure of the material 16 is exposed to light of a color image. Since the exposure head 22 is energized toward a guide shaft 52 by a wire 54 fitted in an offset condition, the head 22 is prevented from being levitated from the guide shaft 52, and accurate exposure can be constantly performed. The photosensitive material 16 is released by a scraper 24, and after water is applied thereto at a water-applying part 26, it is laid upon an image-receiving material by a developing and transferring means 28, an image on the material 16 is developed, and the developed image is transferred onto the image-receiving material 32.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a scanning head guide structure in which a scanning head is guided and driven by an elongated drive body stretched between a pair of pulleys.

[Background technology]

As a structure for guiding the scanning head for image exposure, the scanning head for printing, etc., a wire is stretched between a pair of pulleys.
In some configurations, this wire is attached to a scanning head to move the scanning head along a guide shaft. This scanning head guide structure can be used, for example, as a scanning head of an image recording apparatus that exposes an image onto a photosensitive material using an LED (for example, Japanese Patent Laid-Open No. 5'J-752
No. 47).

In this scanning head guide structure, due to variations in the precision of the pulley around which the wire is wound, a component of the wire tension may act in a direction in which the scanning head moves away from the guide shaft, which may cause a shift in focus during exposure.

The present invention takes the above-mentioned facts into account, and even when attaching a long driving body such as a wire stretched between pulleys to the scanning head, the present invention does not apply force in the direction away from the guide shaft to the scanning head. The objective is to obtain a scanning head guiding structure that can stably guide the scanning head.

[Summary and operation of the invention]

In the scanning head guide structure according to the present invention, the scanning head is attached in a state where the long body spanned between the pair of pulleys is offset from the free state in which the scanning head is not locked.

When the scanning head moves along the guide shaft,
Since the elongate body exerts a force on the scanning head in the direction toward the guide shaft, the scanning head is always moved while being pressed against the guide shaft during movement. Therefore, during movement, the scanning head will not be lifted off the guide shaft and will not cause errors in exposure work, printing work, etc.

[Embodiments of the invention]

A configuration in which the present invention is applied to an image recording apparatus having an exposure head will be described below.

Image recording bag W to which the present invention is applied as shown in FIG.
Reference numeral 10 denotes a magazine 14 which is housed in a machine base 12. A ferro-shaped photosensitive material 16 is housed therein.

The photosensitive material 16 is pulled out from its outer periphery, cut into a predetermined length by a cutter 18, and then wound around the outer periphery of the rotating drum 2°. An exposure head 22 is disposed corresponding to the outer periphery of the rotating drum 20, and rotates the rotating drum 20 in the direction of the arrow to expose an image onto the wound photosensitive material 16.

The exposed photosensitive material 16 is peeled off from the rotating drum 20 by a scraper 24 by rotating the rotating drum 20 in the reverse direction, and after being applied with water as an image forming solvent in a water application section 26, it is sent to a developing transfer means 28.

On the other hand, the upper end of the image receiving material 32 accommodated in the tray 30 is sent to the developing transfer means 28 and is overlapped with the exposed surface of the photosensitive material 16 in close contact. The developing and transferring means 28 has a heating device and has the role of heating the photosensitive material 16 to develop an image and then transferring it to the image receiving material 32.

After development and transfer, the photosensitive material 16 is sent to a waste box 38 by a peeling means 36, and the image receiving material 32 is taken out to a takeout tray 42 via a drying device 40.

The rotating drum 20 and exposure head 22 will be explained according to FIGS. 1 and 3. The rotating drum 20 is rotated in the main scanning direction (in the direction of arrow A) by a driving means (not shown).On the other hand, the exposure head 22 has a sleeve 44 fitted onto a guide shaft 46, and rotates along the guide shaft 46 in the sub-scanning direction. However, this sleeve 44 allows the exposure head 22 to rotate around the axis of the guide shaft 46 (in the direction of arrow C) to facilitate repair of the exposure head 22. The guide shaft 46 is arranged so that its axis is parallel to the axis of the rotating drum 20.

The exposure drum 22 is arranged as shown in FIG.
It has a block shape with a length of about 1/4 arc along the outer periphery, and three light emitting elements 48 are attached to it, and it emits three primary colors by a signal generating means (not shown), and is wound around the rotating drum 20. An image can be exposed onto the emulsion surface of the photosensitive material 16. The exposure head 22 has a slide metal 5 on the opposite side of the part where the sleeve 44 is attached.
0 is attached and comes into contact with the guide shaft 52,
The amount of rotation in the direction opposite to the direction of arrow C is limited. This guide shaft 52 is arranged parallel to the axis of the rotating drum 20.

Further, the exposure head 22 is configured to perform sub-scanning by receiving the driving force of a wire 54, and this wire 54 is wound around a pair of pulleys 56 and 58, and is attached to the exposure head 22 at both ends. The pulleys 56 and 58 receive the driving force of a motor (not shown) and apply the driving force to the exposure head 22.

Here, as shown in FIG. 1, the exposure head 2 of the wire 54
2, the wire 54 is simply wound around the pulleys 56 and 58, and the wire 54 is not secured to the exposure pad 22.The wire 54 is simply wound around the pulley 56, 58, and is offset by a length from the free winding position (shown by imaginary lines in FIG. 1). It has been installed. Therefore, this wire 54
applies a rotational force around the guide shaft 46 to the exposure head 22 in the direction opposite to the direction of arrow C, thereby generating a force that constantly presses the exposure head 22 against the guide shaft 52.

Next, the operation of this embodiment will be explained.

The photosensitive material 16 pulled out from the magazine 14 is cut into a cutter 18.
After being cut and wound around the outer periphery of the rotating drum 20, the rotating drum 20 rotates at high speed, and the exposure head 22 starts exposing the light emitting element 48.

At the same time, the pulleys 56 and 58 move the exposure head 22 in the sub-scanning direction, so that a color image is exposed on the exposure surface of the photosensitive material 16.

In this case, since the exposure head 22 receives a force in the direction of contacting the guide shaft 52 by the wire 54 attached offset, the exposure head 22, the pulley 56 .
Due to manufacturing errors, assembly errors, etc. of 58, exposure to Rad22
does not rise from the guide shaft 52, and accurate exposure is always possible.

The photosensitive material 16 exposed in this way is transferred to the scraper 2.
After being peeled off at step 4 and coated with water at a water coating section 26, it is superimposed on an image receiving material 32 at a developing transfer means 28. In the developing and transferring means 28, the photosensitive material 16 is heated and developed, and the developed image is transferred to the image receiving material 32.

Since water has already been applied to the photosensitive material 16 in the water application section 26, the transfer can be performed reliably. The photosensitive material 16 after the transfer is discarded into a waste box 38, and after the image receiving material 32 is dried by a drying device 40, it is taken out to a take-out tray 42.

Note that the present invention is not limited to the exposure head as in the above embodiment.
It is also applicable to other scanning heads, such as those used for printing by scanning an inkjet.

Further, in the above embodiment, the wire 54 is offset from the free state where it is wound around the pulleys 56 and 58, but the movement trajectory of the wire 54 is changed by a winding rod or the like between the pulleys 56 and 58. In such a case, the wire may be attached to the scanning head with the movement locus changed by these winding rods and offset from the free state in which the wire is not locked to the scanning head.

〔Effect of the invention〕

As explained above, in the scanning head guide structure according to the present invention, since the elongated body is attached to the scanning head offset from the free state, an excellent effect is obtained in that the scanning head can be moved while always being pressed against the guide shaft during scanning. has.

[Brief explanation of drawings]

FIG. 1 is a front view of an exposure head seen from the axial direction of a rotating drum showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing an image recording apparatus to which the present invention is applied, and FIG. 3 is a front view of the exposure head. FIG. 2 is a perspective view showing a wire and its related parts. DESCRIPTION OF SYMBOLS 10... Image recording device, 16... Photosensitive material, 20... Rotating drum, 22... Exposure drum, 46... Guide shaft, 48... Light emitting element, 52... Guide shaft, 54...Wire, 56, 58... Buri.

Claims (1)

[Claims] (1) A scanning head guide structure for movably guiding a scanning head engaged with a driving elongated body stretched between a pair of pulleys along a guide shaft, wherein the elongated body is engaged with the scanning head. A scan head guide arrangement characterized in that the scan head is mounted offset from an unstopped free condition, thereby creating a force pressing the scan head against a guide shaft.