JPS6265664U

JPS6265664U -

Info

Publication number: JPS6265664U
Application number: JP15637085U
Authority: JP
Priority date: 1985-10-15
Filing date: 1985-10-15
Publication date: 1987-04-23
Anticipated expiration: 2000-10-15
Also published as: JPH0529477Y2

Description

[Brief explanation of the drawing]

第１図〜第３図は本考案の一実施例を説明する
ためのもので、このうち第１図はジヤム検知装置
を使用した複写機の要部を示すブロツク図、第２
図は複写機のジヤム検知の行われる場所およびそ
の周辺を表わした概略構成図、第３図はジヤム検
知装置の動作を説明するための流れ図、第４図は
複写機の概略構成図、第５図は従来の複写機にお
けるジヤム検知の原理を示す原理図である。１４……用紙、３１……ＣＰＵ、３３……ＲＯ
Ｍ、３６……サンプリングカウンタ、３９……Ｌ
ＥＤ、４２……フオトダイオード、４３……Ａ／
Ｄ変換器、４４……デイレータイマ、４５……不
揮発性メモリ、５１……感光体ベルト、５５……
転写器。 1 to 3 are for explaining one embodiment of the present invention, of which FIG. 1 is a block diagram showing the main parts of a copying machine using a jam detection device, and FIG.
The figure is a schematic configuration diagram showing the location where jam detection is performed in the copying machine and its surroundings; Figure 3 is a flowchart for explaining the operation of the jam detection device; Figure 4 is a schematic configuration diagram of the copying machine; The figure is a principle diagram showing the principle of jam detection in a conventional copying machine. 14...Paper, 31...CPU, 33...RO
M, 36...sampling counter, 39...L
ED, 42...Photodiode, 43...A/
D converter, 44...delay timer, 45...nonvolatile memory, 51...photosensitive belt, 55...
transcription device.

Claims

[Claims for Utility Model Registration] 1. Irradiating a light beam to a predetermined position on the surface of a photoreceptor, receiving the reflected light with a light receiving element, and comparing the signal level output from this light receiving element with a predetermined reference value, In a copying machine that determines whether or not paper is present on the surface of the photoconductor based on the comparison result, the reference value is created from the output level of the light receiving element when no paper is attached to the surface of the photoconductor. a value creating means, a non-volatile memory for storing the reference value created by the reference value creating means, and a non-volatile memory for storing the reference value created by the reference value creating means; 1. A jam detecting device comprising: a determining means for reading out a reference value determined by the reference value and determining whether or not a sheet of paper is present at a predetermined position on the surface of the photoreceptor. 2. When it is determined that there is no paper at a predetermined position on the surface of the photoconductor during the first photoconductor rotation control after the power of the copying machine is turned on, the reference value creation means calculates the value of the light receiving element determined at this time. The jam detection device according to claim 1, wherein a new reference value is created from the output level to replace a reference value already written in a non-volatile memory. 3. A request for utility model registration characterized in that the output level of the light-receiving element for comparison with a reference value is the average value of the signal levels obtained by sampling the output of the light-receiving element multiple times at a predetermined sampling period. A jam detection device according to scope 1.