JP2010271628A - Opening/closing device of document pressing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening/closing device of a document pressing plate for preventing running out of a compression spring without using an expensive component such as a reinforcing plate. <P>SOLUTION: The opening/closing device of the document pressing plate includes: a hinge case which is attached to a machine body of a copying machine or the like and whose upper part is opened; a rotating shaft inserted in an attaching bracket provided on the upper part of a hinge case; a rotation arm which is rotatably attached to the rotating shaft and integrally attaches the document pressing plate; a cam member integrally provided on a lower side of the rotation arm; a slider slidably stored in the hinge case; and the compression spring which is stored in the hinge case and makes the upper face of the slider elastically abut on the cam member. When a stopper shaft is attached to the upper part of the hinge case to further open the rotation arm from the maximum release angle so as to break the attaching bracket, the opening/closing device prevents running out and scattering of the compression spring. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an opening / closing device for an original pressure plate in a copying machine, a facsimile machine, a scanner, a printer, or a complex machine thereof.

  As a conventional document crimping plate opening / closing device, a hinge case attached to an apparatus main body such as a copying machine and having an upper opening, a rotating shaft inserted into a mounting bracket provided on the upper portion of the hinge case, and the rotation A pivot arm that is pivotally attached to the shaft and integrally attaches the original pressure plate, a cam member that is integrally provided on the lower side of the pivot arm, and a slider that is slidably received in the hinge case And a compression spring that is housed in the hinge case and elastically abuts the upper surface of the slider against the cam member.

  When the rotating arm is further loaded in the opening direction from the maximum release angle, there is a risk that the mounting bracket that rotatably supports the rotating arm via the rotating shaft may be damaged. There is a possibility that the slider and the compression spring may jump out of the hinge case due to the breakage of the mounting bracket.

  Conventionally, there has been no document open / close device for preventing the damage of the support member (such as the mounting bracket) of the rotating arm against the above-mentioned problem, and the compression spring is prevented from jumping out from the hinge case. In some cases, a reinforcing sheet metal was passed through a rotating shaft and was wound around a compression spring.

However, with the above measures, it is costly to employ a reinforcing sheet metal in this switchgear where the cost should be kept as low as possible. Therefore, it is expensive to use a compression spring without using such expensive parts. There has been a demand for an apparatus for opening and closing a manuscript crimping plate that can prevent popping out.

JP 10-315570 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a document crimping plate opening / closing device capable of preventing a compression spring from popping out without using an expensive component such as a reinforcing sheet metal.

  The document crimping plate opening and closing device of the present invention is attached to an apparatus body such as a copying machine and has a hinge case opened at the top, a rotating shaft inserted into a mounting bracket provided on the hinge case, and the rotation A pivot arm that is pivotally attached to the shaft and integrally attaches the original pressure plate, a cam member that is integrally provided on the lower side of the pivot arm, and a slider that is slidably received in the hinge case And an opening and closing device for a manuscript crimping plate comprising a compression spring which is housed in the hinge case and elastically abuts the upper surface of the slider against the cam member, and a stopper shaft is attached to the upper part of the hinge case, If the pivot arm opens further from the maximum release angle and the mounting bracket breaks, the compression spring will pop out. Characterized by configured to block. Further, the rotating arm is configured to prevent further opening from the maximum release angle. Furthermore, the stopper shaft is configured to block the entire width or part of the slider.

  The document crimping plate opening and closing device of the present invention has an advantage that the compression spring can be prevented from popping out without using expensive parts such as a reinforcing sheet metal.

It is a perspective view which shows one Example of the opening / closing apparatus of the original document crimping plate of this invention. FIG. 2 is a side view of the apparatus of FIG. 1. It is a perspective view in the state where the rotation arm of the device of FIG. 1 was opened. FIG. 4 is an exploded perspective view of FIG. 3. It is the fragmentary perspective view which removed the hinge case from FIG. It is a perspective view which shows another Example of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 2, 1 is a hinge case attached to an apparatus main body (not shown) such as a copying machine, 2 is a rotating arm, 3 is a cam member (see FIG. 3), 4 is a rotating shaft, 5 Is a slider, 6 is a compression spring, and 7 is a stopper shaft.

  The hinge case 1 is open at the top. A mounting bracket 1a is provided on the upper part of the two opposite side surfaces of the pair of hinge cases 1.

  The rotary arm 2 is configured so that a document pressing plate (not shown) is integrally attached to the upper surface thereof, and a rotary shaft insertion hole 2a is formed in the rotary base. A cam member 3 is integrally provided below the rotating arm 2.

  The rotating shaft 4 is inserted through the insertion hole 1b (see FIG. 4) of the mounting bracket 1a of the hinge case 1 and the rotating shaft insertion hole 2a (see FIG. 4) of the rotating arm 2, and the rotating arm 2 is rotatably attached to the hinge case 1.

  The slider 5 is housed so as to slide along the inner surface of the hinge case 1. The upper surface of the slider 5 is in contact with the cam surface of the cam member 3 of the rotating arm 2. (See Figure 5)

  The compression spring 6 is accommodated between the bottom wall of the hinge case 1 and the slider 5 so that the slider 5 is brought into elastic contact with the cam member 3.

  Therefore, the original pressure plate attached to the rotating arm 2 is urged in the opening direction by the elastic force of the compression spring 6 through the slider 5 and the cam member 3.

  The stopper shaft 7 is inserted into the stopper shaft insertion hole 1c (see FIG. 4) of the hinge case 1. Therefore, as shown in FIG. 5, even if the rotating arm 2 is further opened from the maximum release angle and an excessive force is applied to the rotating shaft 4 to break the mounting bracket 1a, the stopper shaft 7 is The slider 5 is pressed to prevent the compression spring 6 from jumping out and scattering. The stopper shaft 7 also has a function of suppressing the rotation arm 2 from opening beyond the maximum release angle.

  In the above embodiment, the stopper shaft 7 is configured to be cut off over the entire width of the slider 5, but the stopper shaft of the present invention is not limited to this. For example, as shown in FIG. In addition, a part of the slider 5 may be blocked.

DESCRIPTION OF SYMBOLS 1 Hinge case 1a Mounting bracket 1b Rotating shaft insertion hole 1c Stopper shaft insertion hole 2 Rotating arm 2a Rotating shaft insertion hole 3 Cam member 4 Rotating shaft 5 Slider 6 Compression spring 7 Stopper shaft

Claims (3)

  A hinge case attached to the main body of a copying machine or the like and having an upper opening, a rotating shaft inserted into a mounting bracket provided on the upper portion of the hinge case, a rotating shaft rotatably attached to the rotating shaft, and a document crimp A pivot arm that integrally attaches the plate; a cam member that is integrally provided on the lower side of the pivot arm; a slider that is slidably accommodated in the hinge case; In a document crimping plate opening / closing device comprising a compression spring that elastically abuts the upper surface of the slider against the cam member, a stopper shaft is attached to the upper part of the hinge case, and the rotating arm is further opened from the maximum release angle. When the mounting bracket is broken, it is configured to prevent the compression spring from jumping out and scattering. Switchgear of the original cover according to symptoms.   2. The document crimping plate opening and closing device according to claim 1, wherein the rotation arm is configured to prevent further opening from the maximum release angle.   3. The document crimping plate opening and closing device according to claim 1, wherein the stopper shaft is configured to block the entire width or a part of the slider.