JPS63160549U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the outline of a document size detection device for a copying machine according to this invention, FIG. 1 is an explanatory plan view showing a first embodiment of the document size detection device for a copying machine according to this invention, and FIG. is a view taken from the direction of the arrow in Figure 2, Figure 4 is a sectional view taken along the line in Figure 3, and Figure 5 is
The figure is a sectional view taken along the line in Figure 3, and Figure 6 is Example 1.
7 is a flowchart showing the operating steps of the control device shown in FIG. 6, and FIG. 8 is an embodiment of the document size detection device for a copying machine according to this invention. FIG. 9 is a flowchart showing the operating steps of the control device in FIG. 8, and FIG. 10 shows the operating state of the document size detection device when a document such as a book is placed on the platen. An explanatory plan view, FIG. 11 is an explanatory view showing the operating state when the document size sensor is placed at a location corresponding to the back of a book, etc., and FIG. 12 is a modification of the operating steps of the control device in Embodiment 2. A flowchart showing an example, FIG. 13 is a plan explanatory diagram showing an example of a conventional document size detection device for a copying machine, and FIGS. 14a to 14d are graph diagrams showing output states of the document size sensor corresponding to each document size. , FIG. 15 is an explanatory diagram showing the disadvantages of the conventional document size detection device. [Explanation of symbols] M: Original, N: Swing arm, S: Original size sensor, T: Detection position setting means, U: Discrimination means.

Amendment May 26, 1983 The brief description of the drawing is amended as follows. In the first line of page 24 of the specification, "Figure 1" is corrected to "Figure 2."

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A swinging arm that is provided below the platen on which the original is placed so that it can swing freely across the range of the original of the size to be detected, and the freedom of swing of this swinging arm. a document size sensor provided on the edge side to detect whether or not a corresponding area is a document area; and a detection position setting means to set a location corresponding to a specific area of a document of each size as a detection point of the document size sensor. 1. A document size detection device for a copying machine, comprising: a determining means for determining the document size based on a detection signal from a document size sensor. (2) The document size detection device for a copying machine according to claim 1, wherein the determining means includes a functional unit that corrects a detection signal from a document size sensor.