JPH0796324B2 - Scan head guide structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scanning head guide structure in which a scanning head is guided and driven by a drive elongated body that is wound between a pair of pulleys.

BACKGROUND ART As a structure for guiding a scanning head for image exposure, a scanning head for printing, etc., a wire is laid between a pair of pulleys,
There is a configuration in which this wire is attached to the scanning head and the scanning head is moved along the guide shaft. This scanning head guiding structure can be used as an example of a scanning head of an image recording device which exposes an image to a light-sensitive material using an LED (for example, JP-A-59-75247).

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

In consideration of the above facts, the present invention does not apply a force in the direction away from the guide shaft to the scanning head even when the driving elongated body such as a wire hung between the pulleys is attached to the scanning head. It is an object of the present invention to obtain a scanning head guide structure capable of stably guiding the head.

[Outline and Action of Invention]

In the scanning head guiding structure according to the present invention, the drive elongated body which is hung between the pair of pulleys is scanned in a state in which it is offset to the side separated from the rotary drum with respect to the free state in which the scanning head is not locked. Mounted on the head.

When the scanning head moves along the guide shaft,
Since the elongated body produces a force in the scanning head in a direction approaching the guide shaft, the scanning head always moves while being pressed by the guide shaft during movement. For this reason, the scanning head does not float up from the guide shaft during the movement, thereby causing an error in the exposure work, the printing work and the like.

Example of Invention

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

An image recording apparatus to which the present invention is applied as shown in FIG.
A roll-shaped photosensitive material 16 is stored in a magazine 14 which is stored in a machine base 12. The photosensitive material 16 is pulled out from the outer circumference thereof, cut into a predetermined length by a cutter 18, and then wound around the outer circumference of the rotary drum 20. An exposure head 22 is arranged corresponding to the outer circumference of the rotary drum 20, and the rotary drum 20 is rotated in the direction of arrow A to expose an image on the wound photosensitive material 16.

The exposed photosensitive material 16 is peeled off from the rotary drum 20 by the scraper 24 by the reverse rotation of the rotary drum 20, and water as an image forming solvent is applied at the water applying section 26, and then the developing and transferring means 28.
Sent to.

On the other hand, the image receiving material 32 stored in the tray 30 has the image receiving material 32 at the upper end thereof sent to the developing and transferring means 28 and is superposed on the exposed surface of the photosensitive material 16 in close contact therewith. The developing and transferring means 28 has a heating device, and has a role of heating the photosensitive material 16 to develop the image and then transferring the image to the image receiving material 32.

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

According to FIGS. 1 and 3, the rotary drum 20 and the exposure head 22 are shown.
Will be explained. The rotary drum 20 is adapted to be rotated in the main scanning direction (direction of arrow A) by a driving means (not shown).
On the other hand, the exposure head 22 is configured such that the sleeve 44 is fitted on the guide shaft 46 and can be moved in the sub-scanning direction (direction of arrow B) along the guide shaft 46. However, this sleeve 44 makes it possible to rotate the exposure head 22 around the axis of the guide shaft 46 (direction of arrow C) to facilitate the repair of the exposure head 22. The axis of the guide shaft 46 is arranged parallel to the axis of the rotary drum 20.

As shown in FIG. 1, the exposure head 22 has a block shape having a length of about 1/4 arc along the outer circumference of the rotary drum 20, three light emitting elements 48 are attached, and a signal generator (not shown) is generated. The three primary colors are emitted by the means, and the image can be exposed on the emulsion surface of the photosensitive material 16 wound around the rotary drum 20. The exposure head 22 has a slide metal 50 attached to the opposite side of the portion to which the sleeve 44 is attached, contacts the guide shaft 52, and limits the amount of rotation in the direction opposite to the arrow C direction. The guide shaft 52 is arranged parallel to the axis of the rotary drum 20.

Further, the exposure head 22 receives the driving force of the wire 54 to be sub-scanned, and the wire 54 has a pair of pulleys 56,
It is wound around 58 and attached to the exposure head 22 at both ends. The pulleys 56, 58 receive the driving force of a motor (not shown) and apply the driving force to the exposure head 22.

As shown in FIG. 1, the attachment portion of the wire 54 to the exposure head 22 is such that the wire 54 is simply wound around the pulleys 56 and 58 and is not locked to the exposure head 22. And is attached by being offset by a length L than shown in phantom. Therefore, this wire 54 is exposed to the exposure head 22.
A rotational force in the direction opposite to the arrow C direction around the guide shaft 46 is applied to generate a force for constantly pressing the exposure head 22 against the guide shaft 52.

Next, the operation of this embodiment will be described.

When the photosensitive material 16 drawn from the magazine 14 is cut by the cutter 18 and then wound around the outer circumference of the rotary drum 20, the rotary drum 20 rotates at a high speed, and the exposure head 22 starts exposure by the light emitting element 48. At the same time, the pulleys 56 and 58 are exposed
Since 22 is moved in the sub-scanning direction, a color image is exposed on the exposed surface of the photosensitive material 16.

In this case, since the exposure head 22 receives a force in the direction of abutting against the guide shaft 52 by the wire 54 mounted off-set, the exposure head 22 is also affected by the manufacturing error and the assembly error of the exposure head 22, the pulleys 56, 58. 22 is not lifted from the guide shaft 52, and accurate exposure is always possible.

The photosensitive material 16 thus exposed is peeled off by the scraper 24 and applied with water in the water applying section 26, and then the developing and transferring means.
At 28, it is overlaid with the image receiving material 32. In the developing and transferring means 28, the photosensitive material 16 is heated and developed, and at the same time, the image receiving material 32
The developed image is transferred to the navel. Since the water application section 26 has already applied water to the photosensitive material 16, the transfer is reliably performed. The transferred photosensitive material 16 is discarded in the discard box 38, and the image receiving material 32 is dried by the drying device 40, and then taken out to the take-out tray 42.

The present invention is not limited to the exposure head as in the above embodiment,
The present invention can be applied to other scanning heads such as those in which the ink jet is moved by scanning and used for printing.

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

〔The invention's effect〕

As described above, in the scanning head guiding structure according to the present invention, the drive elongated body is attached to the scanning head in a state where the scanning head is offset toward the side separated from the rotating drum with respect to the free state in which the scanning head is not locked. It has an excellent effect that the scanning head can always be stably moved regardless of variations in accuracy.

[Brief description of drawings]

FIG. 1 is a front view of an exposure head as seen from the axial direction of a rotary 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 an exposure head. It is a perspective view which shows a wire and its related components. 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 …… Pulley.

Claims (1)

[Claims] 1. A scanning head guide having a scanning head locked to a drive elongated body that is hung between a pair of pulleys, and a guide shaft for movably guiding the scanning head along a rotary drum. A structure, wherein the drive elongated body is
The scanning head is attached to the scanning head in a state of being offset to the side separated from the rotary drum with respect to the free state in which the scanning head is not locked, thereby generating a force for pressing the scanning head to the guide shaft. A scanning head guide structure characterized in that