JPH0682649U - Document pressure plate opening / closing device - Google Patents

Abstract

(57) [Summary] [Purpose] With a simple structure, when copying or printing a thick original such as a book, it is possible to lift the original pressure plate by the lift member, and moreover, the original pressure plate has a play. (EN) Provided is a document pressing plate opening / closing device with a lift function, which can perform a stable opening / closing operation that does not occur. [Arrangement] An attachment member attached to the apparatus main body side, and a support member having an end portion rotatably attached to the attachment member,
A lift member for attaching the rear portion of the original pressure plate to the free end side of the support member, the free end side of which is rotatably attached to the support member on the attachment side of the support member, and the attachment of the lift member. It is composed of a portion different from the position and a spring elastically provided between the mounting member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a document pressure plate opening / closing device with a lift function, which is suitable for use in a copying machine or a printing machine.

[0002]

[Prior art]

 Conventionally, as a document crimping plate opening / closing device with a lift function for dealing with a thick document such as a book, a mounting member to be mounted on the main body of the device and an end portion rotatably attached to the mounting member. The attached support member, the lift member for attaching the rear portion of the original pressure plate which is pivotally attached to the free end side of the support member, and the spring elastically provided between the attachment member and the support member. It is known that the lift member is composed of locking means configured to lock and disengage according to the opening angle of the support member.

[0003]

[Problems to be solved by the device]

 Conventionally, the above-described document crimping plate opening / closing device causes no problem because the free end side of the lift member overlaps with the supporting member when the document crimping plate is opened, but the lift member is closed when the document pressing plate is closed. The lift member is locked so that it does not reverse with the shaft attachment point to the support member as a fulcrum, and when the predetermined closing angle is reached, the lock member is released and the lift member can be reversed. Since the locking means is required, the structure is complicated and the manufacturing cost is high.

In addition, since the locking means always releases the locking to the lift member when the original pressure plate is closed to a predetermined closing angle, the original pressure plate is slightly reversed every closing operation. Then, there was a problem that the closing operation became unstable and became unstable.

An object of the present invention is to make it possible to lift an original pressure plate by a lift member with a simple structure and to perform a stable opening / closing operation without rattling the original pressure plate. It is intended to provide an original pressure plate opening / closing device with a lift function.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a mounting member which is mounted on the apparatus main body side, a supporting member whose end portion is rotatably attached to the mounting member, and a free end side of the supporting member. It is composed of a lift member that attaches the rear part of the original pressure plate that is movably attached to the shaft, and a spring that is elastically attached between the portion different from the position where the lift member is attached to the shaft and the attachment member. Is.

In this case, in this invention, when the spring is elastically mounted between the lift member and the mounting member, sliders supported by supporting members are attached to both ends of the spring, and One of them is brought into contact with the lift member and the other is brought into contact with a cam member fixed to a mounting member, or a slider is mounted on the lift member side of the spring, and the mounting member side of the spring is mounted on the slider. It can be supported by a spring receiving member axially attached to the member.

[0008]

[Action]

 When the opened original pressure plate is closed, a spring is elastically provided between the lift member and the mounting member, so that the lift member is pressed by the elastic force of the spring and the original pressure plate is closed without being inverted. If the original is a thick original such as a book, when a force is applied in the closing direction when the original pressure plate comes into contact with the original, the lift member resists the elasticity of the spring and the pivot point is used as the fulcrum. It is possible to turn over and cover the top of the original with the original pressure plate.

[0009]

【Example】

 FIG. 1 shows an embodiment of the present invention. In FIG. 1, 1 is a main body of a copying machine, 2 is an original pressure plate, and 3 is an original pressure plate opening / closing device for opening and closing the original pressure plate 2. Although only one is shown in the drawing, usually two are used.

FIG. 2 and subsequent figures show the structure of this document pressure plate opening / closing device, in which both side plates 4 a and 4 a of the mounting member 4 fixed on the main body 1 have a substantially C-shaped cross section. Both side plates 5a, 5a of the flannel-shaped support member 5 are rotatably attached to one ends thereof via hinge pins 6. Although not shown, friction washers and spring washers, each having a hinge pin 6 inserted through the center thereof, are superposed on the shaft mounting portions of the both side plates 4a, 4a. Friction means is provided which is inserted and is constituted by caulking the ends of the hinge pins 6. A cam member 8 is fixed between the side plates 4a, 4a of the mounting member 4 by a hinge pin 6 and a fixing pin 7.

At the free end sides of the side plates 5a, 5a of the support member 5, a lift member 9 having mounting plates 9a, 9a protruding from both sides is provided with a support pin 10 at one side of the side plates 9b, 9b. It is rotatably attached via a shaft. The operating pin 11 is mounted on a position different from the position where the support member 5 is axially attached by the support pins 10 on both side plates 9b and 9b of the lift member 9. The attachment portions 2a, 2a of the original pressure plate 2 are fixed to the attachment plates 9a, 9a of the lift member 9.

Reference numerals 12 and 12 denote compression coil springs. The compression coil springs 12 and 12 are a pair of tubular sliders 13 and 14 slidably held by the holding portions 5 c and 5 c of the support member 5. It is housed inside and is elastically mounted between the operating pin 11 on the lift member 9 side and the cam member 8 on the mounting member 4 side via the sliders 13 and 14. Reference numeral 15 is a stopper pin for the slider 14 on the cam member 8 side.

Therefore, when the original is a thin original such as paper, the original press plate 2 is opened / closed by the elastic force of the compression coil springs 12, 12 elastically mounted between the lift member 9 and the mounting member 4. The slider 14 abutting on the cam member 8 is stably stopped and held at a predetermined opening angle over the entire stroke of the operation. When the original is a thick original such as a book, the original pressure plate 2 is applied to the thick original, and the operation pin 11 presses the compression coil springs 12 1 and 12 by pressing the front side slightly downward. The lift member 9 is reversed against the elasticity, and the upper portion of the thick original 16 can be covered with the original press plate 2 as shown by the imaginary line in FIG. 1 and the solid line in FIG. At this time, the operating pin 11 fits into the notches 5b and 5b provided on both side plates 5a and 5a of the support member 5 and enables the lift member 9 to be inverted. When the thick original 16 is removed, the original press plate 2 is automatically rotated by the elastic force of the compression coil springs 12 and 12 via the lift member 9 to return to its original position and overlap the supporting member 5.

In the above-described embodiment, the compression coil spring is housed in the inside of the slider held by the support member and elastically provided between the cam member on the mounting member side and the operating pin on the lift member side. However, the mounting member side of the compression coil spring may be configured to be supported by a spring receiving member axially mounted on the mounting member at a position different from the hinge pin.

Further, as means for slidably attaching the slider to the support member, in addition to the embodiment, concave-convex fitting between both side plates of the support member and side portions of the slider, or engagement of notches and ridges It may be replaced with a means depending on the combination.

[0016]

[Effect of device]

 According to the first aspect of the present invention, there is provided a document pressure plate opening / closing device which can cover a thick thick document such as a book with a simple structure and can cover the upper surface thereof and is excellent in operability with few failures. Is something that can be done.

According to the second aspect of the invention, various opening / closing torques of the original pressure plate can be created by changing the shape of the cam member.

According to the third aspect of the invention, the base point of the working axis of the spring is stable, and one of the sliders can be omitted.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a part of a copying machine embodying the present invention.

FIG. 2 is a side view of a document pressure plate opening / closing device according to the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

4 is a sectional view taken along line BB of FIG.

FIG. 5 is an explanatory view for explaining the operation of the document pressure plate opening / closing device according to the present invention.

[Explanation of symbols]

 1 Device Main Body 2 Original Crimping Plate 3 Original Crimping Plate Opening / Closing Device 4 Mounting Member 5 Supporting Member 6 Hinge Pin 8 Cam Member 9 Lifting Member 10 Support Pin 11 Operating Pin 12 Compression Coil Spring 13 Slider 14 Slider 16 Thick Original

Claims (3)

[Scope of utility model registration request] 1. A mounting member to be mounted on the apparatus main body side, a support member having an end portion rotatably attached to the attachment member, and a support member rotatably attached to a free end side of the support member. A lift member to attach the rear part of the original document pressure plate,
An original document pressure plate opening / closing device comprising a portion different from a position where the lift member is attached to a shaft and a spring elastically provided between the mounting member. 2. When elastically mounting the spring between the lift member and the mounting member, sliders slidably supported by support members are attached to both ends of the spring, and one of the sliders is attached to the slider. The original document pressure plate opening / closing device according to claim 1, wherein the lift member is brought into contact with the other member, and the other member is brought into contact with a cam member fixed to the attachment member. 3. When elastically mounting the spring between the lift member and a mounting member, a slider is mounted on the lift member side of the spring, and the mounting member side of the spring is axially mounted on the mounting member. 2. The document pressure plate opening / closing device according to claim 1, wherein the document pressure plate opening / closing device is supported by the spring receiving member.