JP2006123455A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To positively lock an opening/closing lid at full closing with a light pressing force and to suppress the fluctuations of a repulsion load with a simple structure. <P>SOLUTION: The printer having the opening/closing lid 2 which is openably/closably constituted around an opening/closing support P1 with respect to a main body 1, is provided with a damper mechanism 10 having a first arm 11 rotating centering around the opening/closing support 1, a turning barrel 13 rotatably fitted centering around a first rotary shaft P2 on the first arm 11, a second arm 15 rotatable centering around a second rotary shaft P3 on the turning barrel 13 and a third rotary shaft P4 on the main body 1, and a damper spring 14 giving an energizing force around the first rotary shaft P2 with respect to the turning barrel 13. The printer with its opening/closing lid 2 fully closed is constituted so that the straight line connecting the opening/closing support P1 to the first rotary shaft P2 and the straight line connecting the second rotary shaft P3 to the third rotary shaft P4 are substantially parallel, to reduce the repulsion load at full closing to almost zero. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a printer device such as a facsimile or an MFP, and more particularly to a buffer mechanism for an opening / closing lid.

  In a printer device for a small or general household such as a facsimile or an MFP (Multifunction Printer), an open / close lid is provided to open the interior in case of trouble such as replacement of a toner ink cartridge or paper jam. This open / close lid is provided with an image recording unit, a paper feed mechanism, a transport mechanism, a control mechanism, a toner ink cartridge, and the like, and many of them are heavy.

  When such an opening / closing lid is opened and a work is performed, a holding mechanism that holds the open state is provided. Also, when closing the open / close lid by closing the holding mechanism at the end of work, sudden lid closure due to the weight of the open / close lid may cause injury, loud noise due to open / close impact, or destruction or damage of mounted components. In order to eliminate the inconvenience, a damper mechanism is usually provided between the opening / closing lid and the main body. With this damper mechanism, an appropriate repulsive load is applied when the opening / closing lid is opened and closed, and danger prevention and impact mitigation when the lid is closed are intended.

  However, the repulsive load due to the damper mechanism increases as the opening / closing lid is closed, so a large force is required to fully close the opening / closing lid, and the opening / closing lid opens when the hand is released halfway without locking. , The lock feeling becomes worse when the lid is fully closed, and incomplete lock is likely to occur. In the state where the open / close lid is closed and locked, the magnitude of the repulsive load by the damper mechanism is maximized, and therefore the bending stress in the opening direction is always applied to the open / close lid. Depending on the printer device, one of the rollers of the image recording unit, paper feed mechanism, and transport mechanism is provided on the main body side, and the other is provided on the open / close lid side. The pressure at the nip portion is adjusted fairly strictly. Yes. For this reason, if the repulsive load of the damper mechanism varies due to variations in the components of the damper mechanism or changes over time, the pressure at the nip portion of the roller may also fluctuate, which affects recording quality and sheet material conveyance characteristics. .

  Various proposals have been made to solve the problems of such a damper mechanism.

  For example, in Patent Document 1, a swing frame provided with an image reading device is arranged on the upper part of a main body frame in order to make it possible to adjust the balance when the swing frame (open / close lid) is opened and closed. In the image forming apparatus configured to swing the swinging frame via a damper member disposed between the moving frame and the main body frame, the center of gravity of the swinging frame corresponds to the opening / closing operation with respect to the swinging frame. A weight member for adjusting the weight and a moving member thereof are provided. When the swing frame is opened, the weight member is moved to the distal end side of the swing frame, and when the swing frame is closed, the weight member is moved to the support shaft side. An image forming apparatus is disclosed.

In addition, (Patent Document 2) describes an image processing apparatus having an inexpensive damper mechanism that is easy to operate a cover member (opening / closing lid), has stable torque during opening and closing, has high durability, and does not generate abnormal noise. A rack member disposed on the cover member, a gear disposed on the apparatus main body and meshing with the rack member, a conveying unit that conveys the sheet material, and a drive motor that drives the conveying unit. There is disclosed an image processing apparatus which has a gear connected to a drive motor, and the meshing between the rack member and the gear is released when the cover member is closed.
JP 2000-98671 A JP 2001-320526 A

  However, since the image forming apparatus disclosed in the above-mentioned (Patent Document 1) is provided with a mechanism for moving the weight member with respect to the swing frame, movable parts such as a gear, a pulley, and a wire are required. The mechanism becomes complicated.

  In addition, since the image processing apparatus disclosed in (Patent Document 2) is provided with a mechanism that causes the detent torque of the drive motor to act as a damper function of the cover member, mechanical parts such as a rack gear, a damper gear, and a damper coupling gear are provided. Necessary and complicated mechanism.

  Therefore, the present invention provides a simple mechanism that can securely lock the open / close lid when it is fully closed with a light pressing force, and can suppress fluctuations in the repulsive load due to variations in the components of the damper mechanism and aging. It is an object of the present invention to provide a printer apparatus having

  The present invention relates to a printer device having an opening / closing lid configured to be openable / closable around an opening / closing fulcrum with respect to a main body, a first arm that rotates with the opening / closing lid around the opening / closing fulcrum, and a first arm A pivot piece attached to be pivotable about a first pivot axis at the tip of the first, a second pivot axis on the pivot piece, and a third pivot axis on the main body, respectively. A damper mechanism having a rotatable second arm and a damper spring that applies a biasing force around the first rotation axis to the rotation piece, and the open / close lid is fully closed with respect to the main body The main feature is that the straight line connecting the opening / closing fulcrum and the first rotation axis is substantially parallel to the straight line connecting the second rotation axis and the third rotation axis. .

  The printer device of the present invention is a printer device having an opening / closing lid configured to be openable / closable around an opening / closing fulcrum with respect to the main body, a first arm that rotates with the opening / closing lid around the opening / closing fulcrum, A pivot piece that is pivotably mounted around a first pivot axis at the tip of one arm, a second pivot axis on the pivot piece, and a third pivot axis on the main body. Each has a damper mechanism having a second arm that is rotatable about the center, and a damper spring that applies a biasing force around the first rotation axis to the rotation piece, and the open / close lid is entirely attached to the main body. In the closed state, the straight line connecting the opening / closing fulcrum and the first rotation axis and the straight line connecting the second rotation axis and the third rotation axis are substantially parallel to each other, thereby opening and closing The repulsive load is almost zero when the lid is fully closed, and the lid is fully closed with a simple mechanism. Lock reliably performed with a light pressing force, also it is possible to suppress variation in repulsive force by the component variation or aging of the damper mechanism.

  The present invention has a damper mechanism that can easily lock the opening / closing lid with a light pressing force with a simple mechanism, and can suppress fluctuations in the repulsive load due to variations in the components of the damper mechanism and aging. In order to provide a printer device, a printer device having an opening / closing lid configured to be openable / closable around an opening / closing fulcrum with respect to a main body, a first arm that rotates with the opening / closing lid about the opening / closing fulcrum; , A turning piece attached to be rotatable about the first turning shaft at the tip of the first arm, a second turning shaft on the turning piece, and a third turning on the main body A damper mechanism having a second arm that is rotatable about an axis, and a damper spring that applies a biasing force around the first rotation axis to the rotation piece, and the opening / closing lid is attached to the main body Open and close when fully closed And the straight line connecting the point and the first rotational shaft, realized by a straight line connecting the second rotation axis and the third pivot axis is substantially such as to be parallel configuration.

  A first invention made to solve the above problems is a printer apparatus having an opening / closing lid configured to be openable / closable around an opening / closing fulcrum with respect to the main body, and rotating with the opening / closing lid around the opening / closing fulcrum. A first arm attached to the open / close lid, a turning piece attached to the tip of the first arm at a predetermined angle and pivotally about the first turning shaft, The pivot shaft is attached to be pivotable at a predetermined angle around a second pivot shaft provided at a portion of the pivot piece separated by a predetermined distance, and the tip is attached to the main body with the third pivot shaft. A damper mechanism having a second arm pivotably attached as a center, and a damper spring that applies a biasing force around the first rotation axis to the opening of the opening / closing lid with respect to the rotation piece; When the open / close lid is fully closed to the main body, the open / close fulcrum The straight line connecting the first rotation axis and the straight line connecting the second rotation axis and the third rotation axis are substantially parallel, and the opening / closing fulcrum and the first rotation Since the straight line connecting the shaft and the straight line connecting the second rotation shaft and the third rotation shaft are substantially parallel to each other, the force of the damper spring generated by the rotation piece is the same as that of the first arm and the second rotation shaft. The compression tension stress balance with respect to the other arm is formed, and the force in the rotational direction of the first arm with respect to the opening / closing fulcrum becomes zero. That is, the damper repulsion load when the lid is fully closed is eliminated, and the deterioration of the lock feeling and the incomplete lock can be solved.

  The second invention made to solve the above-mentioned problem is characterized in that the damper spring is housed in a hollow portion inside the rotating piece, and by shielding the damper spring from the outside, It is possible to protect the intrusion of the user's hand and paper scraps.

  According to a third aspect of the present invention for solving the above problems, the second arm has an arc-shaped hole concentric with the second rotation shaft, and the rotation piece is fitted into the arc-shaped hole. The rotation angle of the second arm is regulated to a predetermined angle by the arc-shaped hole and the projection, and the second arm is provided with no other parts. The rotation angle of the two arms can be restricted.

(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is an exploded perspective view of a main part showing an embodiment of the present invention, FIG. 2 is a front view of the damper mechanism in the opened state according to the embodiment, and FIG. 3 is a state in which the damper mechanism is closed in the same embodiment. FIG. 4 is a front view, FIG. 4 is an explanatory view showing the operation of the damper mechanism in the same embodiment, and FIG. 5 is a graph showing the relationship between the angle and the acting force of the damper mechanism in the same embodiment.

  In FIG. 1, a household facsimile is shown as the printer apparatus. The facsimile includes a main body 1 placed on a desk or the like, and an open / close lid 2 configured to be openable / closable around an open / close fulcrum 3 with respect to the main body 1. The open / close lid 2 is provided with an image recording unit, a paper feed mechanism, a transport mechanism, a control mechanism, a toner ink cartridge, and the like so that the inside can be opened in the case of trouble such as replacement of the toner ink cartridge or paper jam. It has become. The main body 1 is provided with a sheet feeding mechanism provided below the opening / closing lid 2, a lower roller group in contact with the upper roller group of the transport mechanism, and the like.

A damper mechanism 10 for holding the opening / closing lid 2 in an open state and providing a buffering function when closing the opening / closing lid 2 includes a first arm 11 mounted on an opening / closing shaft which is an opening / closing fulcrum 3 of the main body 1 and the opening / closing lid 2, A mounting plate 12 that is screwed and fixed integrally to the opening / closing lid 2 together with the first arm 11, and a cap-shaped rotating piece that is rotatably mounted by a screw 17 on a screw shaft 12 a that protrudes from the mounting plate 12. 13 and a claw (not shown) that is housed inside the rotating piece 13, one end is locked to a claw 12 b formed on the mounting plate 12, and the other end is provided inside the rotating piece 13. The screw-shaped damper spring 14 to be locked and the screw 18 inserted through the screw through hole 13a provided in the peripheral portion of the rotating piece 13 can rotate with respect to the rotating piece 13 in the screw hole 15a. And a second arm 15 attached to. The base end portion of the second arm 15 is rotatably attached to the main body 1 side by a screw 19 inserted through the screw through hole 15b. In order to increase the load of the damper spring 14, an auxiliary coil spring 20 can be provided inside the damper spring 14.

  The rotary piece 13 is formed with a wing-like projection 13b, and an arcuate hole 15c into which the projection 13b is fitted is provided in the second arm 15. A convex portion 13c is formed at the center side end of the protrusion 13b, and a convex notch 15d corresponding to the convex portion 13c is also formed at the end of the arcuate hole 15c. In the portion of the arc-shaped hole 15c other than the cutout portion 15d, the convex portion 13c functions as a retaining member.

  The outer peripheral side of the arc-shaped hole 15c is a circular arc that is substantially centered on the screw hole 15a, but is linear in the vicinity of the convex notch 15d, and is convex on the inner peripheral side facing the linear portion. A portion 15e is formed, and when the projection 13b of the rotary piece 13 passes, the portion 15e is engaged with the end of the projection 13b to perform the positioning function. An elongated hole 15f is provided inside the arcuate hole 15c so that the protrusion 15e can bend inward when the protrusion 13b passes through the protrusion 15e.

  Next, the operation of the above-described damper mechanism 10 will be described. Here, an opening / closing fulcrum between the main body 1 and the opening / closing lid 2 is P1, a first rotation shaft which is a connecting portion between the mounting plate 12 and the rotation piece 13 is P2, and the rotation piece 13 and the second arm 15 are A second rotation shaft that is a connecting portion of the second arm 15 and the second arm 15 and the main body 1 is referred to as P4.

  As shown in FIG. 2, when the opening / closing lid 2 is opened, the damper spring 14 applies an urging force in a direction to reduce the angle formed by the line connecting P1 and P2 and the line connecting P2 and P3. Therefore, the weight of the open / close lid 2 is overcome and the open / close lid 2 is held open.

  When the opening / closing lid 2 is closed, as shown in FIG. 3, as the point P3 is lowered, the angle formed by the line connecting P1 and P2 and the line connecting P2 and P3 increases, and the damper spring 14 is located inside the rotating piece 13. It is compressed with. In the completely closed state, the line connecting P1 and P2 and the line connecting P3 and P4 are almost parallel, and the restoring force of the damper spring 14 antagonizes the force to raise the opening / closing lid 2, thereby opening / closing the opening / closing lid 2 As a result, the ascending force by the damper spring 14 does not act.

  This operation will be described in detail with reference to FIGS.

In FIG. 4, the force S generated by the damper spring 14 inside the rotating piece 13 increases from S ⁰ to Sθ between the lid opening / closing angles θ. The force S acts as a couple on the rotating shafts P2 and P3. The force S generates drag on P2-P1 and P2-P3 on the rotation axis P2 and on P3-P2 and P3-P4 on the rotation axis P3. Here, if the P2-P3 vector drag is O ₁ and the P3-P2 vector drag is O ₃ , the component force M in the P1 axis tangential direction opens the opening / closing lid 2 with a resultant force O ₁₃ of O ₁ + O _3. It becomes power.

In the graph of FIG. 5, M when the open / close lid 2 is fully opened is the maximum value M ⁰ , and M when the open / close lid 2 is fully closed is the minimum value Mθ.

In this way, when the opening / closing lid 2 is fully closed with respect to the main body 1, a straight line connecting the opening / closing fulcrum P1 and the first rotation axis P2, and the second rotation axis P2 and the third rotation axis P3. By providing a damper mechanism so that the straight line connecting the two is almost parallel, the repulsive load due to the damper spring 14 is almost zero when the opening / closing lid 2 is fully closed, and a simple mechanism is used when the opening / closing lid 2 is fully closed. Can be reliably locked with a light pressing force, and fluctuations in the repulsive load due to variations in the components of the damper mechanism and aging can be suppressed.

  In the present invention, in a printer device such as a facsimile or an MFP, the repulsive load is almost zero when the opening / closing lid is fully closed, and a simple mechanism can reliably lock the opening / closing lid with a light pressing force. It can be used as a printer device that can suppress fluctuations in the repulsive load due to variations in the components of the damper mechanism and aging.

The principal part disassembled perspective view which shows embodiment of this invention Front view of the damper mechanism opened in the same embodiment Front view of the damper mechanism in the same embodiment in the closed state Explanatory drawing which shows the effect | action of the damper mechanism in the same embodiment Graph showing the relationship between the angle of the damper mechanism and the acting force in the same embodiment

Explanation of symbols

1 Body 2 Opening and closing lid 3 Opening and closing fulcrum (P1)
DESCRIPTION OF SYMBOLS 10 Damper mechanism 11 1st arm 12 Mounting plate 12a Screw shaft 12b Claw 13 Rotating top 13a Screw through hole 13b Projection 13c Protrusion part 14 Damper spring 15 Second arm 15a Screw hole 15b Screw through hole 15c Arc-shaped hole 15d Convex notch 15e Convex 15f Slot 17, 18, 19 Screw 20 Auxiliary coil spring P2 1st rotation axis P3 2nd rotation axis P4 3rd rotation axis

Claims (3)

In a printer apparatus having an opening / closing lid configured to be openable / closable around an opening / closing fulcrum with respect to the main body,
A first arm attached to the open / close lid so as to rotate with the open / close lid around the open / close fulcrum;
A pivot piece attached to the tip of the first arm at a predetermined angle and pivotable about a first pivot axis;
The first pivot shaft is attached to be pivotable at a predetermined angle around a second pivot shaft provided at a portion of the pivot piece that is separated by a predetermined distance, and a tip is attached to the main body at a third position. A second arm that is pivotally mounted about the pivot axis of
A damper mechanism having a damper spring that applies a biasing force in the direction in which the opening / closing lid is opened around the first rotation axis to the rotation top;
A straight line connecting the open / close fulcrum and the first rotation axis, and a straight line connecting the second rotation axis and the third rotation axis when the opening / closing lid is fully closed with respect to the main body. A printer apparatus characterized by having a configuration in which the two are substantially parallel. The printer device according to claim 1, wherein the damper spring is housed in a hollow portion inside the rotating frame. The second arm has an arc-shaped hole concentric with the second rotation shaft, the rotation piece has a protrusion fitted into the arc-shaped hole, and the arc-shaped hole The printer device according to claim 1, wherein the rotation angle of the second arm is restricted to a predetermined angle by the protrusion and the protrusion.

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