JPS62244853A - Sheet type object conveying device - Google Patents

Abstract

PURPOSE:To prevent a waste of the suction of an adsorbingly conveying roller and carry out efficient adsorbing conveyance of a sheet type object by providing a hollow conveying roller having a number of ventilation ports on its cylindrical part, providing a fixed core in its hollow part, and providing a suction groove and a discharge groove on said fixed core. CONSTITUTION:When an air pump is given, the inside of a suction groove 32 becomes a negative pressure while the inside of a discharge groove 34 becomes a positive pressure. Accordingly, ventilation ports which are opposite to the suction groove 32 have an adsorbing function while ventilation ports opposite to the discharge groove 34 have an expulsive function. when a drive roller 50 is driven and a suction roller 10 is rotated and, as a sheet 12 to be scanned is carried in in the direction of the arrow 14, the sheet 12 is adsorbed to the suction roller 10 and conveyed at the peripheral speed of the roller 10, on a conveying groove 36. Whereas, on a lower course side part of the conveying groove 36, the sheet 12 to be scanned is separated from the roller 10 due to a discharged air from the ventilation ports 22 and placed on a lower course guide 18 without hindrance. Accordingly, waste of suction and discharge can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a conveying device for a sheet-like object that is conveyed by a conveying roller, and particularly relates to a conveying device that can accurately convey a sheet-like object at a constant speed. It is something.

[Technical background of the invention and prior art]

As is well known, a conveyance device that conveys a sheet-like object using a conveyance roller having an axis perpendicular to the conveyance direction of the sheet-like object is used in various devices, such as various light beam scanning recording devices and various light beam scanning reading devices. It is also used as a means for conveying a sheet to be scanned in a light beam scanning device such as a scanner.

Among the above-mentioned conveyance devices, the sheet conveyance device used in the light beam scanning device as described above is particularly useful when used as a means for performing sub-scanning by moving the sheet-like object to be scanned at the scanning position of the light beam. , it is required to convey the scanned sheet at a constant speed and with high precision. For this reason, an apparatus can be considered in which the conveyance roller is an adsorption conveyance roller, and the sheet-like object is conveyed by the rotation of the roller while being attracted to the roller, thereby increasing the accuracy of conveyance of the sheet-like object. However, since the suction conveyance roller is hollow and has suction holes on almost the entire surface of its cylindrical portion, the suction holes in the portion of the cylindrical portion other than the portion that suctions the sheet-like object also perform suction. Therefore, there is a disadvantage that there is a lot of waste in suction, and sheet-like objects cannot be efficiently attracted.

Furthermore, the sheet-like material is usually flexible, and the tip of the sheet-like material that has been transported is bent along the suction transport roller, and the upstream end of the sheet-like material, such as a guide member provided downstream of the suction transport roller, is bent. Not only will it not be possible to convey the sheet properly if it comes into contact with the sheet, but there is a risk that the sheet material will be damaged due to physical force.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems of the conventional sheet conveyance device using suction conveyance rollers. It is an object of the present invention to provide a conveyance device that can efficiently adsorb and convey objects.

The present invention further provides a sheet in which the sheet-like object that is attracted and conveyed by the suction conveyance roller is reliably peeled off from the roller after being conveyed by the roller, and the sheet-like object can be conveyed without being damaged by the guide member on the downstream side. The purpose of the present invention is to provide a device for transporting shaped objects.

[Structure of the invention]

The structural feature of the sheet-like material conveying device according to the present invention, which conveys a sheet-like material by means of a suction conveying roller having an axis in a direction perpendicular to the conveying direction of the sheet-like material, is that the cylindrical portion has a large number of passages. It has a hollow conveyance roller provided with pores and a fixed core disposed in the hollow part of the hollow conveyance roller,
The fixed core is provided with a suction groove that communicates with a ventilation hole on the upstream side of the conveyance section of the hollow conveyance roller, and a discharge groove that communicates with the ventilation hole on the downstream side, and the suction groove communicates with a suction device, The above-mentioned discharge groove is connected to a discharge device.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A light beam scanning device incorporating a conveyance device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of the beam scanning device, in which a light beam 1 emitted from a light source 1
A galvanometer mirror 6 is installed as an optical deflector in the optical path 2 of a.
is arranged, and an fθ lens 9 as a scanning lens is arranged on the optical path 8 where the light beam 1a is reflected by the galvanometer mirror 6. Furthermore, a suction roller 10 is disposed at a position where the light beam 1a is focused by the f.theta. The suction roller 10 moves the scanned sheet 12, which is a sheet-like object, to the arrow 14.
an upstream guide 16 for guiding the movement in the direction;
It is rotatably supported by a frame 20 provided with a downstream guide 18 .

The suction roller IO is formed hollow, and a plurality of ventilation holes 22 are provided in the cylindrical portion, and the drive roller 50 and the receiver are rotationally driven while the inner and outer surfaces of the suction roller IO are held between the rollers 52.

A fixed core 30 having an outer diameter slightly smaller than the inner diameter of the cylindrical portion is disposed inside the cylindrical portion of the suction roller 10. As shown in FIG. 2, the fixed core 30 has a suction groove 32 and a discharge groove 3 provided parallel to the axis of the suction roller 10.
4, and a roller groove 54, the grooves 32 and 34 are arranged so that the intake groove 32 is on the upstream side and the discharge groove 34 is on the downstream side in the conveying groove 36 between the upstream guide 16 and the downstream guide 180. will be placed in The intake groove 32 is connected to the intake port of the air pump (not shown) through a communication member (not shown), while the discharge groove 34 is connected to the air pump (not shown) through another communication member (not shown). It communicates with the discharge port of.

In the light beam scanning device having the above configuration, by driving the air pump, the inside of the intake groove 32 becomes negative pressure, and the inside of the discharge groove 34 becomes positive pressure. Therefore, the ventilation holes 22 facing the intake grooves 32 have an adsorption effect, and the ventilation holes 22 facing the discharge grooves 34 have an expulsion effect. Here, when the drive roller 50 is driven and the suction roller lO rotates, and the scanned sheet 12 is conveyed in the direction of the arrow 14, the scanned sheet 12 is first attracted by the suction rollers ′ and 0 in the conveyance groove 36. and is conveyed at the circumferential speed of the suction roller lO, which rotates clockwise in FIG. On the other hand, the scanned sheet 12 is peeled off from the suction roller 10 by the air discharged from the vent 22 at the downstream side of the conveyance groove 36, and is placed on the downstream guide 18 without any hindrance.

In such a conveyance state, the light beam 1a emitted from the light source 1 is swung by the swinging of the galvanometer mirror 6, and scans the vicinity of the portion of the scanned sheet 12 that is attracted by the suction roller 10.

In the above embodiment, the suction roller 10 is sandwiched between the drive roller 50 and the roller 52 and driven to rotate, but the suction roller is pivoted and the shaft is directly driven to rotate by a motor or the like. Of course, this is a good thing.

The embodiments of the present invention in light beam scanning devices have been described above, but the present invention is not limited to light beam scanning devices, but can be effectively used in any device that requires highly accurate conveyance of sheet-like objects. be.

〔Effect of the invention〕

The present invention has a simple structure as described above, and the suction roller has not only the suction function of the sheet-like object but also the peeling function on the downstream side of the conveyance area by the roller. Therefore, there is no risk of the leading end of the scanning sheet being attracted to the suction roller and being damaged by contact with the guide member provided downstream of the suction roller, and flexible sheet-like materials can also be used effectively. It has the effect of precision conveyance.

In addition, in the present invention, suction and discharge from the vents are performed only for the vents that act on the sheet-like object, so there is no waste in suction and discharge, and the sheet-like object can be accurately drawn at the desired speed using a small-sized suction/discharge device. It also has the effect of being able to be transported.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a light beam scanning device incorporating an embodiment of the present invention, and FIG. 2 is a perspective view of a fixed core. 1... Light source 6... Galvanometer mirror 10... Suction roller 12... Scanned sheet 20... Frame 22...・Suction hole 32...Intake groove 34...Discharge groove

Claims (2)

[Claims] (1) In a sheet-like material conveyance device that transports a sheet-like material by means of a suction conveyance roller having an axis in a direction perpendicular to the conveyance direction of the sheet-like material, a hollow conveyance roller having a cylindrical portion provided with a large number of ventilation holes is used. , a fixed core disposed in the hollow portion of the hollow conveyance roller, and a suction groove in which the fixed core communicates with a ventilation hole located upstream of the conveyance portion of the hollow conveyance roller;
1. A sheet-like material conveying device, characterized in that a discharge groove is provided that communicates with a vent hole located on the downstream side, the suction groove communicates with a suction device, and the discharge groove communicates with a discharge device. (2) A sheet-like article according to claim (1), wherein the suction groove is communicated with an inlet side of an air pump, and the discharge groove is communicated with an outlet side of the same air pump. Conveyance device.