JP4089907B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus capable of easily and efficiently resetting a document when a jam occurs.

  In the conventional image forming apparatus such as a copying machine, even when a jam occurs, the document feed lift plate is raised to a position where the document set on the document feed lift plate is pressed by the feed roller.

  For this reason, there is a problem that the width of the original cannot be adjusted because a roller mark of the paper feed roller is attached to the original or it is difficult to move the original when the original is reset.

  In order to solve such a problem, there has been proposed an image forming apparatus that once lowers the document feed lift plate to the lowest limit of the vertically movable range of the document feed lift plate when a jam occurs.

  This is because when the user resets the original on the paper feed lift plate that has been lowered to the lowermost limit, and presses the start key again, the image forming apparatus will return the original paper feed lift plate. Is raised to a position where the uppermost portion of the document reset on the document feed lift plate comes into contact with the feed roller.

When the uppermost part of the original comes into contact with the paper feed roller, the original is conveyed one by one from the uppermost part of the original while reading the document while lifting the original feed lift plate so as to keep the contact state. (See Patent Document 1).
JP 08-119468 A

  However, in the above-described prior art, each time a jam occurs, the document feeding lift plate is lowered to the lowest limit, so that a recovery time loss from when the document is reset to when conveyance is started again is lost. Was big.

  Therefore, in view of the above problems, the present invention reduces the recovery time after resetting the original by lowering the original feed lift plate by an amount corresponding to the initial number of originals set when a jam occurs. An object of the present invention is to provide an image forming apparatus that reduces the number of image forming apparatuses.

  The present invention is premised on an image forming apparatus in which a document feeding lift plate is lowered by a driving unit when a jam is detected by a jam detecting unit.

The present invention provides a calculation means for calculating a drop amount corresponding to the initial number of sheets set on the document feed lift plate, and a drive for controlling the drive of the drive means based on the drop amount calculated by the calculation means. Control means, and the calculation means performs a subtraction process based on position information when the document is first set on the document feed lift plate and position information when a jam is detected by the jam detection means. And the amount of descent is calculated .

  In this way, when the jam occurs, the document feed lift plate is lowered by an amount corresponding to the initial number of documents set, so that the recovery time loss after resetting the document can be reduced. .

  The set number of sheets may be a number obtained by adding a predetermined number to the number of documents.

  In this way, it is possible to secure a work space necessary for resetting the original, and it is possible to easily perform the resetting.

  When a jam occurs, the document feed lift plate is lowered by an amount corresponding to the initial number of documents set, so that a recovery time loss after the document is reset can be reduced.

  Hereinafter, a case where an embodiment of the present invention is applied to a copying machine as an image forming apparatus will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram showing an internal structure of a copying machine according to an embodiment of the present invention, and FIG. 2 is a schematic functional block diagram of the copying machine according to the embodiment of the present invention.

  As shown in FIGS. 1 and 2, the copying machine according to the embodiment of the present invention includes a document feed lift plate 1 for setting a document.

  The document feeding lift plate 1 can be moved up and down together with the rack 2a by a driving force of a driving means 2 constituted by, for example, a stepping motor or the like, and the position of the document feeding lift plate 1 is the position of the rack 2a. Based on the above, the position detecting means 3 can grasp the position. The position information of the rack 2a corresponding to the maximum reach position of the document feed lift plate 1 is stored in the calculation means 4 described later.

  When the user sets a document on the document feed lift plate 1 and the first start key 5 is pressed, the position detection means 3 receives the fact and the position of the document feed lift plate 1 at that time. The position of the rack 2a corresponding to is detected, and the detected position information is stored in the storage means 6.

  Further, the drive control means 7 starts driving the drive means 2 and raises the rack 2a to raise the document feed lift plate 1.

  As the document feed lift plate 1 is raised, when the upper limit detection means 8 composed of an optical sensor or the like detects the uppermost portion of the document that is initially set on the document feed lift plate 1, this is indicated. In response, the position detecting means 3 detects the position of the rack 2 a corresponding to the position of the document feed lift plate 1 at that time, and stores the detected position information in the storage means 6.

  Further, the drive control means 7 controls the drive means 2 to start conveying the original, and when the paper feed roller 2b finishes conveying one original, the original supply by an amount corresponding to the one original is made. The paper lift plate 1 is raised.

  Thereafter, each time the upper limit detecting means 8 detects the uppermost part of the original, the original is conveyed one by one from the paper supply roller 2b, and the uppermost part of the original is always applied to the paper supply roller 2b at the start of conveyance. I try to be in contact.

  An image forming process in which the originals conveyed one by one by the paper feed roller 2b in this way arrives at the reading unit 2d through the separation unit 2c and is read, and the image data of the read original is transferred to the paper. Will be performed.

  On the other hand, when a paper transport jam occurs during the image forming process, the document feed lift plate 1 is lowered, and the user resets the document while the document is initially set. It will start.

  When the jam detection means 9 detects a jam and notifies the calculation means 4 to that effect, the calculation means 4 starts in response to that fact and holds the position information stored in the storage means 6 and itself. The subtraction process is performed based on the position information to be calculated, and the descent amount of the document feeding lift plate 1 is calculated by calculating the descent amount of the rack 2a according to the initial set number of originals.

  Based on the amount of descent calculated as described above, the drive control means 7 controls the drive means 2 to lower the rack 2a and lower the document feed lift plate 1.

  When the user resets the original document on the document feed lift plate 1 lowered and presses the start key 5 again, the drive control means 7 resumes the drive of the drive means 2, The rack 2a is raised to raise the document feed lift plate 1.

  When the upper limit detecting means 8 detects the uppermost part of the original that has been reset on the original paper feeding lift board 1 as the original feeding lift plate 1 is raised, the drive control means 7 is the driving means. 2 is started again, and the conveyance of the original is started again. When the paper feed roller 2b finishes conveying the original, the original feed lift plate 1 is raised by an amount corresponding to the one original. To.

  Thereafter, each time the upper limit detecting unit 8 detects the uppermost part of the original, the original is conveyed one by one from the paper supply roller 2b, and the uppermost part of the original is always transferred to the paper supply roller 2b at the start of conveyance. It comes into contact.

  An image forming process in which the originals conveyed one by one from the paper feed roller 2b in this manner reach the reading unit 2d via the separation unit 2c and are read, and the image data of the read originals are transferred to the paper. Is done.

  In this way, when the jam occurs, the document feed lift plate is lowered by an amount corresponding to the initial number of documents set, so that the recovery time loss after resetting the document can be reduced. .

  It should be noted that an operation is performed to add a predetermined number of originals to the number of originals before setting the original and pressing the start key 5 for the first time. The position may be further lowered by a predetermined amount, and the lowering amount of the document feeding lift plate 1 when a jam occurs may be adjusted as appropriate.

  In this way, it is possible to secure a work space necessary for resetting the original, and it is possible to easily perform the resetting.

  The configuration described in the above embodiment is merely a specific example and does not limit the technical scope of the present invention. Any configuration can be employed within the scope of the effects of the present application.

  When a jam occurs, the document feed lift plate is lowered by an amount corresponding to the initial number of documents set, which is useful in reducing the recovery time loss after resetting the document.

1 is a schematic diagram showing an internal structure of a copying machine according to an embodiment of the present invention. 1 is a functional block diagram showing a copying machine according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Document feeding lift plate 2 Drive means 4 Calculation means 7 Drive control means 9 Jam detection means

Claims (2)

In the image forming apparatus in which the document feeding lift plate is lowered by the driving unit when the jam is detected by the jam detecting unit.
A calculating means for calculating a descending amount according to the first set number of documents on the document feed lift plate;
Drive control means for controlling the drive of the drive means based on the amount of descent calculated by the calculation means ,
The calculation means calculates a descent amount by performing a subtraction process based on position information when a document is first set on the document feed lift plate and position information when a jam is detected. An image forming apparatus.   2. The image forming apparatus according to claim 1, wherein the set number of sheets is a number obtained by adding a predetermined number of sheets to the number of documents.

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