JPS615241A - Magnification varying device of copying machine - Google Patents

Abstract

PURPOSE:To vary magnifications in the longitudinal direction and the transverse direction independently of each other by controlling the change of the lens position and that of the scanning speed independently of each other in a slit-type copying machine which varies magnifications of the area in accordance with the change of the combination between the lens position and the scanning speed. CONSTITUTION:If either of a feed-direction magnification varying switch 24 and a breadthwise- direction magnification varying switch, for example, the switch 24 is depressed after depression of a switch 20 which varies magnifications in the longitudinal direction and the transverse direction independently of each other and a stepwise magnification varying switch 28 or a continuous magnification varying switch 30 is designated to set the variable power rate to a desired value, a scanning speed setting device 8 is controlled through a control circuit 32 for independently varying magnifications in the longitudinal direction and the transverse direction, and the quantity of light is set by a light quantity setting device 10. Simultaneously, the magnification in the feed direction is displayed on a feed-direction magnification display part 36. If the breadthwise-direction magnification switch is designated, a lens position driving device 6 and the light quantity setting device 10 are driven, and the magnification in the breadthwise direction is displayed on a breadthwise-direction magnification display part 38. Certainly, magnification varying of the area is possible as conventional. Thus, magnifications are easily varied in the longitudinal direction and the transverse direction independently of each other.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a variable magnification device for a copying machine. More particularly, the present invention relates to a variable magnification device for a copying machine that enables independent magnification in the vertical and horizontal directions.

2. Description of the Related Art Recently, with the diversification of uses for copying machines, copying machines with variable magnification devices have become commonplace. However, the variable magnification mechanism in many of these copying machines equipped with a variable magnification device is
A copying machine with a function of area magnification, that is, vertical and horizontal magnification at the same ratio, and independent magnification in the vertical and horizontal directions (unspecified area magnification and unidirectional linear magnification) has never been provided before. This probably requires scaling in only one direction other than area scaling.
This is thought to be due to the fact that in the past there was little demand for such copies. However, with the recent diversification of uses for copying machines, there has been some demand for copying machines that can change magnification in only one direction.

OBJECTS OF THE INVENTION An object of the present invention is to expand the applications of a copying machine by adding means for independent control so that the vertical and horizontal magnification ratios can be selected independently.

According to the present invention, in a slit exposure type copying machine that performs area magnification 41 by a combination of changing the lens position and changing the scanning speed, the lens position changing and the scanning speed changing are performed respectively. A copying machine magnification changing device is provided, which is characterized in that independent control means is provided to enable independent magnification in the vertical and horizontal directions. By adding a vertical and horizontal independent magnification mechanism, it is possible to freely expand and contract the original], so it is considered to be useful for use in fields such as graphic design, for example.

Embodiments The present invention will be described below in detail based on embodiments shown in the drawings. First, referring to FIG. 1, there is shown a magnification control block diagram of an embodiment of the present invention. This vertical and horizontal independent variable magnification system includes a variable magnification film degree switch unit 2, a control circuit 4, a lens position driving device 6, a scanning speed setting device 8,
It is composed of a light amount setting device 10 and a display 12. The magnification setting switch unit 2 is divided into a magnification mode selection section 14, a magnification direction selection section 16, and a magnification rate selection section 18. The magnification mode selection section 14 has an independent vertical and horizontal magnification switch 20 and an area magnification switch 22, and the magnification direction selection section 16 has a feed direction magnification switch 24 and a width direction magnification switch 26, and selects a magnification ratio. Section 18 includes a step magnification switch 28 and a continuous magnification switch 30.

The control circuit 4 includes an independent vertical/horizontal scaling control circuit 32 and an area scaling control circuit 34. By pressing the vertical/horizontal independent scaling switch 20, the independent vertical/horizontal scaling control circuit 32 is turned on.
Further, by pressing the area magnification switch 22, the area magnification control circuit 34 is turned on. The lens position driving device 6 is constituted by a stepping motor, and the scanning speed setting bag @8 is constituted by servo control using a servo motor. Furthermore, although the light amount setting device 10 is configured to adjust the current of an exposure lamp, the present invention is not limited to this, and may be implemented by, for example, adjusting the slit width. The display 12 has a feed direction magnification display 36 and a width direction magnification display 38.

In the above-described configuration, first, a case where area magnification is performed will be described. First, the area magnification change switch 22 is pressed, and then the stepwise magnification change switch 28 or the continuous magnification change switch 30 is pressed to select and set the desired magnification ratio. Area magnification switch 2
When 2 is pressed, the area magnification control circuit 34 is turned ON, and thereby the lens position driving device 6, scanning speed setting device 8, and light amount setting device 10 are controlled to match the selected magnification. At the same time, the same value of the selected magnification is displayed on the display 12 for both the feed direction magnification display 36 and the width direction magnification display 38. - Next, when you want to perform vertical and horizontal independent magnification, first press the vertical and horizontal independent magnification switch 20. Next, either the feed direction magnification change switch 24 or the width direction magnification change switch 26 is pressed to select the magnification change direction. Here, it is assumed that the feed direction magnification switch 24 is pressed,
In the next step, a desired magnification ratio is set by pressing either the step magnification switch 28 or the continuous magnification change switch 30. By pressing the vertical/horizontal independent magnification switch 20, the vertical/horizontal independent magnification control circuit 32 is turned ON, and by further pressing the feed h direction magnification switch 24,
This control circuit 32 controls the feeding direction. That is, the scanning speed setting device 8 is driven to adjust the selected scanning speed, and the light amount setting device 10 is controlled to adjust the amount of light to be appropriate for the selected magnification. At this time, the feed direction magnification display 36 on the display 12 displays the selected feed direction magnification. Next, the widthwise magnification switch 26 is pressed, and the desired widthwise magnification is selected using the stepwise magnification switch 28 or the continuous magnification switch 30.

In this way, the vertical and horizontal independent magnification control circuit 32 drives and controls the lens position driving device 6 to adjust the lens position so as to provide the selected width direction magnification, and also to adjust the light amount setting device @
10 to provide the most appropriate amount of light for the selected feed direction magnification ratio and width direction magnification ratio.

At this time, the widthwise magnification display 38 on the display 12 displays the selected widthwise magnification.

Referring to FIG. 2, there is shown another embodiment of the present invention, in which area magnification is also controlled in combination with vertical and horizontal independent magnification. Therefore, there is no need to provide an area scaling control circuit in the control circuit 4. According to this circuit configuration, area scaling is set by separate settings for the vertical and horizontal directions. Although the operability of selecting the frequently used area magnification becomes worse, the circuit is simplified.

FIGS. 3 and 4 show still another embodiment of the present invention, and the embodiment shown in FIG. 3 is a block diagram of an embodiment having functions of changing magnification in area and in the scanning direction only. FIG. 4 is a block diagram of an embodiment having a function of changing magnification in area and only in the width direction.

That is, in the embodiment shown in FIG. 3 or 4, in addition to the area scaling function, an independent scaling function in only one direction is added.

In the above description, it has been explained that the lens position driving device 6 is constituted by a stepping motor, but an induction motor, a DC motor, or the like may be adopted.

Furthermore, regarding the scanning speed setting device 8, the scanning speed may be changed by clutch switching instead of servo control.

Effects of the Invention According to the present invention, in addition to the area magnification function, a vertical and horizontal independent magnification function is added, so that the application of the copying machine can be expanded to fields that were previously unavailable.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing the 4fiI feeling of magnification control of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, and FIGS. 3 and 4 are schematic diagrams of the present invention. FIG. 2 is a block diagram showing another embodiment. 2 is a magnification setting switch unit, 4 is a control circuit, 6 is a lens position driving device, 8 is a scanning speed setting device, 10 is a light amount setting device, 12 is a display, 20 is a vertical and horizontal independent magnification switch, and 22 is an area magnification changer. The switch 32 is an independent vertical and horizontal magnification control circuit, and 34 is an area magnification control circuit.

Claims (1)

[Claims] In a slit exposure copying machine that performs area magnification by a combination of changing the lens position and changing the scanning speed, by providing a means for independently controlling the lens position change and the scanning speed change, it is possible to achieve vertical and horizontal independent magnification. A variable magnification device for a copying machine, characterized in that it enables.