JP3642376B2 - Pressure plate opening / closing mechanism of scanner device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to a scanner device that presses a document placed on a contact glass with a pressure plate and scans the image surface of the document to read an image. It relates to the mechanism.
[0002]
[Prior art]
3 to 5 are side views of a conventional pressure plate opening / closing mechanism used in the scanner device, respectively. FIG. 6 is an exploded perspective view of a pressure plate and a stopper lever in the conventional pressure plate opening / closing mechanism. Here, FIG. 3 shows a state where the pressure plate is opened to the maximum opening degree, and FIGS. 4 and 5 show a state where the pressure plate is held at a pressurizing position for pressurizing the document on the contact glass. Yes. Reference numeral 1 denotes an apparatus main body of a scanner apparatus configured as a book type scanner. Reference numeral 2 denotes a contact glass fitted on the upper surface of the apparatus main body 1. On the contact glass 2, a document D from which an image is read is placed. Reference numeral 3 denotes a pressure plate for bringing the document D into close contact with the contact glass 2 when an image is read by the scanner device. The pressure plate 3 is supported by a pressure plate opening / closing mechanism, which will be described later, so as to be swingable between a closed position and an open position. The pressure plate 3 swings from an open position separated from the original D on the contact glass 2 to a closed position shown in FIG. 4 or 5 to pressurize the original D so that the image surface of the original D is the original of the contact glass 2. Adhere to the mounting surface 2a.
[0003]
Reference numeral 11 denotes a hinge lever that connects the apparatus main body 1 and the pressure plate 3. The hinge lever 11 is supported at one end by a swing shaft 1 a provided on the apparatus main body 1 and at the other end to the pressure plate 3. It is supported by a swing shaft 3a provided. Here, the pressure plate 3 is supported by a swing shaft 1a together with the hinge lever 11 so as to be swingable in a closed position or an open position, and the hinge lever 11 is opposite to the swing shaft 1a and the swing shaft 3a. By swinging in the direction, the distance between the original pressure surface of the pressure plate 3 and the original placement surface 2a of the contact glass 2 can be adjusted. Therefore, the distance between the pressure plate 3 and the document placement surface 2a is adjusted according to the thickness of the document D placed on the contact glass 2, so that it is closed without being affected by the thickness of the document D. The entire original D can be brought into close contact with the original placing surface 2a with the pressure plate 3 in position and the original placing surface 2a of the contact glass 2 parallel to each other.
[0004]
Reference numeral 12 denotes a stopper lever that connects the pressure plate 3 and the apparatus main body 1. The stopper lever 12 that constitutes a pressure plate opening / closing mechanism together with the hinge lever 11 is configured such that a connecting shaft 12 a provided at one end can swing by the apparatus main body 1. While being supported, a sliding pin 12b implanted in the other end is slidably engaged with a slide groove 3b formed in the pressure plate 3. Here, the stopper lever 12 regulates the maximum opening degree of the pressure plate 3 by bringing the sliding pin 12b into contact with the groove end 3c in the slide groove 3b adjacent to the swing shaft 3a when the pressure plate 3 is opened. The pressure plate 3 at the opening position of the opening (hereinafter, this position is referred to as the fully open position) is supported so as not to fall.
[0005]
[Problems to be solved by the invention]
However, in the pressure plate opening / closing mechanism as described above, each time the pressure plate 3 is opened to the fully open position, the sliding pin 12b abuts against one groove end 3c of the slide groove 3b, and the pressure plate 3 is supported by the stopper lever 12 to the fully open position. In this state, the sliding pin 12b pressurizes the groove end 3c with a pressing force corresponding to the weight of the pressure plate 3. In particular, when the user swings the pressure plate 3 to a fully open position with a strong force (high speed), a large impact force acts on the groove end 3c of the slide groove 3b by the slide pin 12b.
[0006]
The pressure plate 3 is generally formed by pouring a molten resin into a mold and molding (molding), and most of the pressure plate 3 is constituted by a resin material formed in a thin plate shape for weight reduction and cost reduction. . In this case, as the entire pressure plate 3, it is possible to ensure a sufficient strength by forming a rib shape as appropriate or by forming a portion where a high load acts on a box-like structure, but it acts locally. The strength of the pressure plate 3 against the external force is almost determined by the thickness of the resin material. Therefore, when the repeated load and the applied pressure of the impact force by the sliding pin 12b are applied to the groove end 3c many times or in the long term, the pressure plate 3 has a crack C starting from the groove end 3c as shown in FIG. It tends to occur. The force acting on the groove end 3c by the sliding pin 12b is mainly composed of the component force P _{1 in} the extending direction of the slide groove 3b and the component force P _{2 in the} opening direction centering on the swing shaft 1a. crack C in the pressure plate 3 is often generated synthesized component force in the direction P ₁ and P _2, i.e. in a direction inclined in an opening direction to the direction of the pivot shaft 1a from groove end 3c.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure plate opening / closing mechanism of a scanner device that can prevent cracking of a pressure plate caused by repetition of an opening operation to a fully open position in order to solve the above problem.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a pressure plate opening / closing mechanism of a scanner device according to claim 1 of the present invention is a scanner that presses a document placed on a contact glass with a pressure plate and scans the document image surface to read an image. A pressure plate opening / closing mechanism disposed on a device main body of the device, wherein the pressure plate is supported in a swingable manner at a closed position for pressing the original on the contact glass or an open position spaced from the original on the contact glass. A hinge lever that supports the apparatus main body and the pressure plate so that the document placement surface of the contact glass and the document pressure surface of the pressure plate can be brought into contact with and separated from each other at the closed position or the open position. And one end portion is slidably connected to the apparatus main body, and a slide pin provided at the other end portion is slidably engaged with a slide groove formed in the pressure plate, A stopper lever that regulates the maximum opening of the pressure plate when the slide pin abuts on one end of the slide groove and is fixed to the pressure plate, and when the pressure plate is opened to the maximum opening, the slide groove A groove end reinforcing portion that contacts the sliding pin together with one end and receives a direct impact force and pressure from the sliding pin, and the impact force and pressure generated from the sliding pin acting on one end of the slide groove And a reinforcing member including a deformation suppressing portion in surface contact with the upper surface of the pressure plate so as to suppress deformation of the pressure plate.
[0009]
According to the pressure plate opening / closing mechanism of the scanner device of the first aspect, the reinforcing member fixed to the pressure plate contacts the slide pin together with one end of the slide groove when the pressure plate is opened to the maximum opening degree. Surface contact with the upper surface of the pressure plate so as to suppress deformation of the pressure plate caused by the impact force and pressure from the sliding pin acting on one end of the slide groove, and the groove end reinforcement that receives direct impact force and pressure from the moving pin By providing the reinforcing member composed of the deformation suppressing portion, the impact force and pressure directly acting on one end of the slide groove are alleviated by the groove end reinforcing portion, and the internal stress accompanying the deformation of the pressure plate is reduced by the deformation suppressing portion. Alleviated.
[0010]
The pressure plate opening / closing mechanism of the scanner device according to claim 2 is characterized in that, in the pressure plate opening / closing mechanism according to claim 1, the mounting portion of the reinforcing member in the pressure plate is thicker than the plate thickness near the slide groove in the pressure plate. It is characterized by.
[0011]
According to the pressure plate opening / closing mechanism of the scanner device according to claim 2, the attachment portion of the reinforcement member in the pressure plate is made thicker than the plate thickness in the vicinity of the slide groove in the pressure plate, so that the attachment strength of the reinforcement member is sufficiently large. In addition, the impact force and the applied pressure transmitted from the reinforcing member to the pressure plate are dispersed to prevent the vicinity of the mounting portion from being destroyed by the impact force and the applied pressure.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a side view of a pressure plate opening / closing mechanism of a scanner device according to an embodiment of the present invention. FIG. 2 is a perspective view of a pressure plate and a reinforcing plate used in the pressure plate opening / closing mechanism of the scanner device of the present embodiment. The members corresponding to the members described based on FIG. Reference numeral 21 denotes a pressure plate for bringing the document D into close contact with the contact glass 2 at the time of image reading by the scanner device. The pressure plate 21 is supported by a pressure plate opening / closing mechanism so as to be swingable in a closed position or a fully open position as in the conventional pressure plate 3. The pressure plate 21 swings from an open position separated from the original D on the contact glass 2 to a closed position shown in FIG. 1 to pressurize the original D so that the image surface of the original D is placed on the original placement surface of the contact glass 2. Adhere to 2a. Reference numeral 22 denotes a reinforcing plate fixed at a predetermined position on the pressure plate 21. The reinforcing plate 22 is provided with a groove end reinforcing portion 22a having a tip end surface having substantially the same shape as the curved surface on which the groove end 3c of the slide groove 3b is formed, and a deformation suppressing portion 22b bent into an angle shape. An insertion hole for inserting the fixing screw 23 is formed in the connecting portion 22c between the 22a and the deformation suppressing portion 22b.
[0014]
Further, the side plate portion of the pressure plate 21 is formed in a thin plate shape. The side plate portion of the pressure plate 21 is provided with a slide groove 3b, and a mounting portion 21a having a screw hole is connected to the side plate portion of the pressure plate 21. It is integrally formed. The cylindrical boss-shaped mounting portion 21a is formed thicker than the slide groove 3b in the pressure plate 21 to make the mounting strength of the reinforcing plate 22 sufficiently large and the impact transmitted from the reinforcing plate 22 to the pressure plate 21. The force and the applied pressure are dispersed to prevent the vicinity of the mounting portion 21a from being broken by the impact force and the applied pressure.
[0015]
The reinforcing plate 22 is fastened and fixed to the pressure plate 21 by the fixing screw 23 by inserting the fixing screw 23 into the insertion hole of the connecting portion 22c and screwing the fixing screw 23 into the screw hole of the attachment portion 21a. At this time, the groove end reinforcing portion 22a of the reinforcing plate 22 is supported so that the front end surface thereof is at the same position as the groove end 3c of the slide groove 3b, and the deformation suppressing portion 22b is in surface contact with the upper surface of the pressure plate 21 in a pressurized state. To be supported. Therefore, the groove end reinforcing portion 22a receives a part of the direct impact force and pressure from the sliding pin 12b by contacting the sliding pin 12b together with the groove end 3c of the sliding groove 3b when the pressure plate 21 is fully opened, and deformed. The suppressing part 22b presses the pressure plate 21 to be deformed by the impact force and the applied pressure from the sliding pin 12b in the direction opposite to the deformation direction, and suppresses the deformation of the pressure plate 21.
[0016]
According to the pressure plate opening / closing mechanism of the scanner device according to the present embodiment described above, the reinforcing plate 22 fixed to the pressure plate 21 slides with the groove end 3c of the slide groove 3b when the pressure plate 21 is opened to the maximum opening degree. By receiving a part of the impact force and the applied pressure from 12b, the impact force and the applied pressure from the slide pin 12b acting on the groove end 3c of the slide groove 3b when the pressure plate 21 is opened to the maximum opening degree are reduced. Therefore, the operation of opening the pressure plate 21 to the fully open position is repeated many times, and even when the pressure plate 21 is held at the fully open position for a long time, cracks are generated on the pressure plate 21 starting from the vicinity of the groove end 3c of the slide groove 3b. This can be suppressed.
[0017]
The reinforcing plate 22 reinforces the groove end so as to abut against the sliding pin 12b together with the groove end 3c of the sliding groove 3b when the pressure plate 21 is opened to the maximum opening degree and to receive a direct impact force and pressure from the sliding pin 12b. Deformation suppressing portion that is in surface contact with the upper surface of the pressure plate 21 in a pressurized state so as to suppress the deformation of the pressure plate 21 caused by impact force and pressure from the sliding pin 12b acting on the groove end 3c of the slide groove 3b. 22b, the impact force directly acting on the groove end 3c of the slide groove 3b is relieved by the groove end reinforcing portion 22a, and the internal stress accompanying deformation of the pressure plate 21 is relieved by the deformation suppressing portion 22b. It is possible to effectively suppress the occurrence of cracks starting from the vicinity of the groove end 3c of the slide groove 3b in FIG.
[0018]
Furthermore, by making the mounting portion 21a of the reinforcing plate 22 in the pressure plate 21 thicker than the plate thickness in the vicinity of the slide groove 3b in the pressure plate 21, the mounting strength of the reinforcing plate 22 is made sufficiently large. Since the impact force and the applied pressure transmitted to the pressure plate 21 are dispersed and the vicinity of the mounting portion 21a is prevented from being destroyed by the impact force and the applied pressure, the reinforcement plate 22 reduces the impact force and the applied pressure to the pressure plate 21. The function can be stably maintained for a long period of time, and the pressure plate 21 can be prevented from being broken by the stress concentrated on the mounting portion 21a.
[0019]
【The invention's effect】
As described above, according to the pressure plate opening / closing mechanism of the scanner device of the first aspect of the present invention, the reinforcing member fixed to the pressure plate slides together with one end of the slide groove when the pressure plate is opened to the maximum opening. A groove end reinforcing portion that abuts against a moving pin and receives a direct impact force and pressure from the slide pin, and suppresses deformation of the pressure plate caused by the impact force and pressure from the slide pin acting on one end of the slide groove. In this way, the deformation restraining portion that is in surface contact with the upper surface of the pressure plate is provided, so that the impact force and the applied pressure directly acting on one end of the slide groove are alleviated by the groove end reinforcing portion, and the deformation restraining portion can deform the pressure plate. As the internal stress is relieved, the operation to open the pressure plate to the fully open position is repeated many times, and even when the pressure plate is held at the fully open position for a long time, cracks starting from the groove end of the slide groove occur on the pressure plate. It can be effectively suppressed Rukoto.
[0020]
According to the pressure plate opening / closing mechanism of the scanner device according to claim 2, the reinforcing member mounting strength is sufficiently large by making the mounting portion of the reinforcing member in the pressure plate thicker than the plate thickness in the vicinity of the slide groove in the pressure plate. In addition, the impact force and the applied pressure transmitted from the reinforcing member to the pressure plate are dispersed to prevent the vicinity of the mounting portion from being destroyed by the impact force and the applied pressure. The function of reducing the pressure can be stably maintained for a long period of time, and the pressure plate can be prevented from being broken by the stress concentrated on the mounting portion.
[Brief description of the drawings]
FIG. 1 is a side view of a pressure plate opening / closing mechanism of a scanner device according to an embodiment of the present invention.
FIG. 2 is a perspective view of a pressure plate and a reinforcing plate used in a pressure plate opening / closing mechanism of the scanner device according to the embodiment of the present invention.
FIG. 3 is a side view of a conventional pressure plate opening / closing mechanism used in the scanner device.
FIG. 4 is a side view of a conventional pressure plate opening / closing mechanism used in the scanner device.
FIG. 5 is a side view of a conventional pressure plate opening / closing mechanism used in the scanner device.
FIG. 6 is an exploded perspective view of a pressure plate and a stopper lever in a conventional pressure plate opening / closing mechanism.
FIG. 7 is an explanatory diagram of a crack generated in a pressure plate in a conventional pressure plate opening / closing mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Apparatus body, 1a, 3a ... Oscillating shaft, 2 ... Contact glass, 2a ... Original placing surface, 3, 21 ... Pressure plate, 3b ... Slide groove, 3c ... End of groove, 11 ... Hinge lever, 12 ... Stopper lever, 12a ... connecting shaft, 12b ... sliding pin, 21a ... mounting portion, 22 ... reinforcing plate, 22a ... groove end reinforcing portion, 22b ... deformation suppressing portion, 22c ... connecting portion, 23 ... fixing screw, D ... manuscript, C ... crack .

Claims (2)

A document placed on the contact glass is pressed by a pressure plate, and is placed in the main body of the scanner device that scans the document image surface to read the image. The pressure plate is closed from the closed position where the document on the contact glass is pressed. In the pressure plate opening and closing mechanism supported so as to be swingable at an open position away from the document on the contact glass,
The pressure plate is supported so as to be swingable in the closed position or the open position, and in the closed position, the apparatus main body and the pressure plate are arranged so that the document placement surface of the contact glass and the document pressure surface of the pressure plate can be contacted and separated. A connected hinge lever;
One end portion is slidably connected to the apparatus main body, and a slide pin provided at the other end portion is slidably engaged with a slide groove formed in the pressure plate, and the slide pin is inserted into the slide groove. A stopper lever that abuts one end of the plate and regulates the maximum opening of the pressure plate when opened,
Is fixed to the pressure plate, direct impact force from the sliding pin abuts against the said sliding pin one end of the slide groove upon opening the pressure plate until the maximum opening and groove end reinforcing portion for receiving the pressure force And a reinforcing member composed of a deformation suppressing portion in surface contact with the upper surface of the pressure plate so as to suppress deformation of the pressure plate caused by impact force and pressure applied from the sliding pin acting on one end of the slide groove. A pressure plate opening / closing mechanism of the scanner device. 2. The pressure plate opening / closing mechanism of the scanner device according to claim 1, wherein the mounting portion of the reinforcing member on the pressure plate is thicker than the thickness of the pressure plate near the slide groove.

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