JP2007333971A - Opening/closing device for original pressing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening/closing device for an original pressing plate, in which the absorbing energy power thereof is adjusted by a single damper and a user or a serviceman can easily and quickly adjust the absorbing energy power in an assembled state. <P>SOLUTION: The opening/closing device for the original pressing plate comprises: an attaching member to be attached to the device main body of a copying machine or the like; a supporting member pivotally attached to the attaching member so as to freely turn and supporting the original pressing plate; first and second sliders housed in the supporting member so as to freely slide; and a compression coil spring interposed between the sliders and energizing the original pressing plate in an opening direction. A fluid damper is provided in the compression coil spring and is constituted of: a cylinder with a proximal end attached and fixed to the first slider; a piston sliding in the cylinder; an abutting stem provided integrally with the piston and provided so that its distal end part may abut on the second slider; a first fluid chamber formed on one side of the piston; a second fluid chamber formed on the other side of the piston; and a flow adjusting needle valve for adjusting the speed of fluid moving between the first fluid chamber and the second fluid chamber with the movement of the piston. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a document crimping plate opening / closing device in a copying machine, a facsimile machine, a scanner, or a complex machine thereof.

  As a conventional document crimping plate opening and closing device, there are an attachment member attached to a main body of a copying machine or the like, a support member pivotally attached to the attachment member and supporting the document crimping plate, and the support member A first and second sliders slidably housed therein, and a compression coil spring that is interposed between the sliders and biases the original crimping plate in the opening direction. In some cases, a fluid damper device is provided between the support member and the support member to operate only at a predetermined closing angle or less.

However, as shown in FIG. 4 (A), the fluid damper device has a constant absorbed energy force of the damper, so it is necessary to prepare dampers having different absorbed energy forces according to the weight of the original pressure plate (ADF). was there.
Therefore, it has become a factor of productivity and high cost.
Utility Model Registration No. 2558914

  The problem to be solved by the present invention is to provide a document crimping plate opening / closing device capable of solving the problems of the conventional fluid damper.

  The present invention relates to an attachment member attached to a main body of an apparatus such as a copying machine, a support member pivotally attached to the attachment member and supporting an original cover, and slidably received in the support member. In a document crimping plate opening / closing device comprising a first and second sliders and a compression coil spring interposed between the sliders and energizing the document crimping plate in an opening direction, a fluid damper is provided in the compression coil spring. The fluid damper is provided integrally with the cylinder having a base end portion fixedly attached to the first end, a piston that slides inside the cylinder, and the tip end portion of the fluid damper. A contact stem provided to contact the slider; a first fluid chamber formed on one side of the piston; a second fluid chamber formed on the other side of the piston; With the movement, characterized by being configured from the flow regulating needle valve for adjusting the rate of fluid moving between the first fluid chamber and second fluid chamber. A fluid passage through which fluid moves between the first and second fluid chambers is formed in the cylinder, and a flow rate adjusting needle valve for adjusting the amount of fluid movement in the fluid passage is provided at the base end of the cylinder. Features.

  As shown in FIG. 4 (B), the document crimping plate opening / closing device of the present invention can adjust the absorbed energy force with a single damper even if the weight of the document crimping plate or other opening / closing member changes. In addition, there is an advantage that the user or a service person can easily and quickly adjust the absorbed energy power in the assembled state.

  In FIG. 1, P is a document pressure plate, and is attached to an apparatus body M such as a copying machine via an opening / closing device H so as to be freely opened and closed. The opening / closing device H includes an attachment member 1 attached to the device body M, a support arm 3 pivotally attached to the attachment member 1 via a hinge shaft 2, and a tip of the support arm 3. It is mainly composed of a lift arm 5 which is pivotally attached to a part via a support shaft 4 and which attaches and fixes the original pressure plate P.

  A first slider 6 and a second slider 7 are slidably accommodated in the support arm 3 in the longitudinal direction, and a compression coil spring 8 is interposed between the first and second sliders 6 and 7. ing. In this embodiment, a double coil spring is used, but the present invention is not limited to this. The cam follower 7 a of the second slider 7 is in contact with the cam portion 9 installed on the mounting member 1.

  The opening / closing device H according to the present invention is not limited to the above-described structure. For example, the support shaft 4 and the lift arm 5 are omitted, and the document pressing plate P is attached and fixed to the support arm 3. Any of the conventionally known structures may be used.

  As shown in FIG. 2, a fluid damper 10 is mainly a cylinder 10a, a piston 10b, a contact stem 10c, a first fluid chamber 10d, a second fluid chamber 10e, and a flow rate adjusting needle valve. 10f, a coil spring 10g, a diaphragm 10h, and a fluid passage 10j. The base end portion of the cylinder 10 a is attached and fixed to the first slider 6. On the other hand, the tip end portion of the contact stem 10c comes into contact with the second slider 7. As shown in the figure, when the distance between the sliders 6 and 7 is widened, the tip of the contact stem 10 c is separated from the second slider 7.

  The piston 10b is slidably accommodated in the cylinder 10a. A first fluid chamber 10d is formed on one side of the piston 10b, and a second fluid chamber 10e is formed on the other side so that the volume thereof changes as the piston 10b moves. It has become.

  The piston 10b is provided with a fluid passage 10j. As the piston 10b moves, the viscous fluid (for example, silicon oil) in the first fluid chamber 10d is moved to the second fluid chamber 10e. The fluid in the second fluid chamber 10e is moved to the first fluid chamber 10d. The flow rate adjusting needle valve 10 f adjusts the absorbed energy force of the fluid damper 10 by adjusting the flow rate of the fluid. The flow rate adjusting needle valve 10f can be easily adjusted from the back side (downstream side) of the opening / closing member H in the opened state.

  Since the opening / closing apparatus of the present embodiment is configured as described above, when the original cover P is closed from the state shown in FIG. 1 to the state shown in FIG. When the repulsive force is overcome and the abrupt lowering is attempted, the tip of the contact stem 10c of the fluid damper 10 contacts the second slider 7.

  When the tip of the contact stem 10c contacts the second slider 7, the piston 10b integrated with the contact stem 10c tends to move in the cylinder 10a in the direction of the first fluid chamber 10d.

  When the piston 10b moves in the direction of the first fluid chamber 10d, the fluid in the first fluid chamber 10d moves through the fluid passage 10j into the second fluid chamber 10e. The moving speed of the piston 10b at that time, that is, the absorbed energy force of the fluid damper 10 depends on the flow rate of the fluid through the fluid passage 10j.

It is sectional drawing which shows 1st Example of the opening / closing apparatus of the original document crimping plate of this invention. It is the external view (A) and enlarged sectional view (B) of the fluid damper of FIG. It is action | operation explanatory drawing of the apparatus of FIG. It is the graph (A) which shows the energy absorption power by the conventional fluid damper, and the graph (B) which shows the energy absorption power by the fluid damper of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mounting member 2 Hinge shaft 3 Support arm 4 Support shaft 5 Lift arm 6 1st slider 7 2nd slider 7a Cam follower 8 Compression coil spring 9 Cam part 10 Fluid damper 10 'Fluid damper 10a Cylinder 10b Piston 10j Fluid path 10c Contact stem 10d First fluid chamber 10e Second fluid chamber 10f Needle valve for flow rate adjustment 10g Coil spring 10h Diaphragm P Original pressure plate M Device body H Opening / closing device

Claims (2)

  An attachment member attached to a main body of a copying machine or the like; a support member pivotally attached to the attachment member and supporting an original pressure plate; and a first and a second member slidably received in the support member In a document crimping plate opening / closing device comprising a second slider and a compression coil spring interposed between the sliders and biasing the document crimping plate in the opening direction, a fluid damper is provided in the compression coil spring, A fluid damper is provided integrally with the cylinder having a base end portion fixedly attached to the first end, a piston sliding inside the cylinder, and the piston abutting on the second slider. An abutting stem, a first fluid chamber formed on one side of the piston, a second fluid chamber formed on the other side of the piston, and the movement of the piston Switchgear of the original cover, characterized in that consisted flow regulating needle valve for adjusting the rate of fluid moving between the first fluid chamber and second fluid chamber.   A fluid passage through which fluid moves between the first and second fluid chambers is formed in the cylinder, and a flow rate adjusting needle valve for adjusting the amount of fluid movement in the fluid passage is provided at the base end of the cylinder. 2. The document crimping plate opening and closing device according to claim 1, wherein: