JP2019120274A - Opening/closing device, and information terminal device - Google Patents

Abstract

To provide an opening/closing device capable of reducing the number of components by omitting a slider and coping with auxiliary energizing force of a wide range requiring many kinds of lid bodies by using a common elastic member.SOLUTION: An opening/closing device includes: a case-shaped mounting member 11 mounted on device body side; a support member 12 mounted on a lid body side; a hinge shaft 13 for connecting the support member 12 to the mounting member 11 in a rotatable manner; and auxiliary energization means for causing the support member 12 to act. Then, the auxiliary energization means is formed by a torsion spring which is fixedly housed in the case-shaped mounting member 11, wherein one end part of the auxiliary energization means is brought into contact with the mounting member 11 and the other end part is brought into contact with the support member 12.SELECTED DRAWING: Figure 4

Description

  The present invention is an opening / closing device suitable for use in opening / closing a relatively lightweight lid of an information terminal device such as a copying machine, a printing machine, a multifunction device, a scanner, etc., and the opening / closing device. Information terminal equipment.

  An open / close device used to attach a relatively lightweight lid (also referred to as an original cover) to an apparatus body so as to be openable / closable among information terminal devices such as copying machines, printing machines, multifunction machines, and scanners. A case-like mounting member mounted on the side of the device body, a supporting member for supporting the lid rotatably mounted on the side plates of the mounting member via the hinge shaft, and the supporting member being in contact with the supporting member For example, Patent Documents 1 and 2 disclose an open / close device configured of a slider slidably housed in a mounting member, and an elastic member resiliently provided between the slider and the bottom plate of the mounting member. As is known. However, in information terminal devices such as copying machines, the year of demand for cost reduction for the switchgear has become more severe year by year.

Unexamined-Japanese-Patent No. 2006-10979 JP, 2017-96428, A

  Therefore, an object of the present invention is to propose a switchgear having a simple configuration and to answer the above technical problems.

  In order to solve the problems described above, the opening / closing device according to the present invention comprises a case-like mounting member mounted on the device body side, a support member mounted on the lid side, and rotating the support member relative to the mounting member. An opening / closing device having a hinge shaft which is movably connected and an auxiliary biasing means for applying an auxiliary biasing force to the support member, wherein the auxiliary biasing means is fixed in the case-like mounting member. It is characterized in that it comprises a torsion spring in which one end is brought into contact with the mounting member and the other end is brought into contact with the support member.

  In this case, according to the present invention, the mounting member is detachably mounted in a mounting hole provided at the rear upper end of the device body, or vertically mounted at the rear upper end of the device body It is characterized in that it is attached to the device body by any one means of being horizontally attached to the rear upper end of the body.

  Furthermore, the present invention is characterized in that the mounting member has a holding portion that holds the coil portion of the torsion spring from the outside and resists the reaction force of the auxiliary biasing force.

  Furthermore, the present invention is characterized in that the mounting member has a holding portion that holds the coil portion of the torsion spring from the outside and resists the reaction force of the auxiliary biasing force.

  Furthermore, according to the present invention, the support member has a cam surface having a cross-sectional shape perpendicular to the hinge shaft and projected to the torsion spring side on the surface on which the other end of the torsion spring abuts and moves. It is characterized by having.

  Further, according to the present invention, the contact position of the other end of the torsion spring with respect to the support member corresponds to the rotation of the support member in accordance with the rotation of the support member in the direction of reducing the auxiliary biasing force. It is characterized in that it moves from the moving end side to the hinge shaft side.

  Furthermore, according to the present invention, the torsion spring has a pair of coil portions formed symmetrically with respect to a plane orthogonal to the hinge shaft, and the wire rods on both outer sides of the pair of coil portions are continuous in a U shape. The other end of the torsion spring is formed.

  Furthermore, the present invention is characterized in that the torsion spring is inserted into the coil portion and provided on the attachment member, and has a sandwiching member for sandwiching the coil portion of the torsion spring with the holding portion. .

  Furthermore, the present invention is characterized in that one end of the torsion spring is held by a holding portion provided so as to be position adjustable with respect to the mounting member in order to adjust the auxiliary biasing force.

  Furthermore, according to the present invention, the torsion spring is provided in a range in which the opening angle of the lid with respect to the device body is a predetermined angle or less on the surface of the support member on which the other end of the torsion spring abuts and moves. And a cam surface formed to reduce the amount of torsional elastic deformation.

  The present invention is characterized in that it is an information terminal device using the above-mentioned switching device.

According to the present invention, even if the slider is omitted and the number of parts is reduced, the torsion spring can control the rotational torque generated to the support member at the time of the opening and closing operation of the lid of the apparatus. It is possible to reduce the cost significantly.
.

FIG. 1 is an explanatory diagram of a configuration of a copying machine of Embodiment 1. (A) is a first position which is a closed position. (B) is a second position which is an open position. It is explanatory drawing of the external appearance of a switching device. It is an exploded perspective view of an opening and closing device. It is sectional drawing of the switchgear of an assembly state. It is a top view of the switchgear of an assembly state. It is explanatory drawing of the state which moved the torsion spring back. (A) is the 1st position at the time of arranging a torsion spring in a standard position. (B) is a second position when the torsion spring is disposed at the reference position. (C) is the 1st position at the time of arranging a torsion spring in the back position. (D) is a 2nd position at the time of arranging a torsion spring in a back position. It is explanatory drawing of the state which moved the torsion spring below. (A) is a first position when the torsion spring is disposed at the lower position. (B) is a second position when the torsion spring is disposed at the lower position. (C) is the 1st position at the time of arranging a torsion spring in the back lower position. (D) is a 2nd position at the time of arrange | positioning a torsion spring in back downward position. It is an explanatory view of a relation between an opening angle of an opening and closing device and an assist torque. FIG. 9 is an explanatory view of the configuration of the switchgear of the second embodiment. FIG. 14 is an explanatory view of a configuration of a switchgear of Example 3; FIG. 14 is an explanatory view of a configuration of a switchgear of Example 4; FIG. 14 is an exploded perspective view of the switchgear of Example 4; FIG. 18 is an explanatory view of the operation of the switchgear of embodiment 4; (A) is a second position. (B) is an intermediate position. (C) is the first position.

  Embodiments of the present invention will be described in detail with reference to the attached drawings. In the following embodiment, a case where the present invention is applied to a lid (original pressure plate) used in a copying machine, which is an example of an information terminal device, will be described, but the opening / closing device according to the present invention In addition to scanners and the like, it can also be used as a toilet seat for a Western-style toilet bowl, an opening / closing device for a toilet lid, an opening / closing device for a lid of a furniture cabinet, and the like.

(Copy machine)
FIG. 1 is an explanatory view of the configuration of the copying machine of the first embodiment. In FIG. 1, (a) is a first position which is a closed position, and (b) is a second position which is an open position. As shown in (a) of FIG. 1, the opening / closing device 10 of the first embodiment is configured such that the upper surface of the image reading device 2, which is an example of the device main body, It is connected to open and close freely. As shown in FIG. 1B, the copying machine 1 can open the original cover 3 with respect to the image reading apparatus 2 by the opening / closing device 10 and place the original on the glass plate 5 It is. The opening / closing device 10 fixes the mounting member 11 to the image reading device 2 by a screw (not shown) and also fixes the support member 12 to the original cover 3 by a screw (not shown). The operation unit 6 is provided with a touch panel (not shown) and various switches.

(Switchgear)
FIG. 2 is an explanatory view of the appearance of the switchgear. FIG. 3 is an exploded perspective view of the switchgear. FIG. 4 is a cross-sectional view of the switchgear in an assembled state. FIG. 5 is a plan view of the switchgear in an assembled state. In FIG. 5, the torsion spring 16 below the support member 12 is illustrated by an alternate long and short dash line.

  As shown in FIG. 2, the opening / closing device 10 has a case-like mounting member 11 mounted on the device body side, a support member 12 mounted on the lid side, and a support member 12 rotatable relative to the mounting member 11. It has the hinge shaft 13 to connect, and the auxiliary biasing means which makes the supporting member 12 exert an auxiliary biasing force. The auxiliary biasing means is accommodated in the case-like mounting member 11 by fixing the positions of the coil portions 16a and 16a, bringing one end 16c into contact with the mounting member 11, and supporting the other end 16b. A torsion spring 16 is in contact with the member 12.

  The mounting member 11 is resin-molded in a case shape by injection molding, and accommodates the torsion spring 16 therein. The support member 12 is resin-molded into a plate shape by injection molding, and is connected to the mounting member 11 by a hinge shaft 13. The supporting member 12 is pivotable relative to the mounting member 11 in an angular range from a first position P1 having an opening angle of 0 degrees to a second position P2 having an opening angle of about 70 degrees. The torsion spring 16 generates an auxiliary biasing force to act on the support member 12 so as to push up the support member 12 from the first position P1 to the second position P2.

  The opening / closing device 10 implements an inclination adjusting means of the original cover 3 by inserting the mounting member 11 into the opening 2a which is an example of the mounting hole on the apparatus main body side and movably in the insertion / removal direction. When a thick original is pressed by the original cover 3, the mounting member 11 moves in the opening direction in the opening 2a, and the inclination of the original cover 3 is corrected in parallel to allow external light to enter the exposure system. It is configured to be able to prevent the Further, at the time of maintenance of the device body, it is also possible to easily remove the original cover 3 integrally with the mounting case from the device body upward. In addition, the attachment method with respect to the apparatus main body of the switching device 10 is not limited to the method of inserting in the opening 2a. Whether the mounting member is detachably mounted in the mounting hole provided at the rear upper end of the device body, vertically mounted at the rear upper end of the device body, or horizontally mounted at the rear upper end of the device body , Attached to the device body by any one means. Alternatively, the present invention can also be applied to one in which mounting plate portions are provided so as to protrude from both sides of the mounting member 11 and the mounting member 11 is fixed to the back or upper surface of the device body via the mounting plate with mounting screws (not shown).

  As shown in FIG. 3, the plate-like mounting portion 12a of the support member 12 is formed with a plurality of stepped mounting holes 12c for screwing the original cover (3: FIG. 1). In the support member 12, a convex portion 12e and a contact surface 12g are formed on the lower surface of the mounting portion 12a, and the convex portion 12e is penetrated to form an axial hole 12b. The axial hole 12 b rotatably supports the central portion 13 a of the hinge shaft 13.

  The convex portion 12 e of the support member 12 is held inside the pair of bearing portions 11 a, 11 a formed on the mounting member 11. Shaft holes 11b and 11b are formed in the bearing portions 11a and 11a. One of the shaft holes 11 b and 11 b holds the end portions 13 b and 13 b of the hinge shaft 13 in a tight fit to prevent the hinge shaft 13 from coming off.

  As shown in FIG. 4, the outer circumferential surfaces of the coil portions 16 a and 16 a of the torsion spring 16 are held by the holding portion 11 d which is a recess formed in the mounting member 11. In the no-load state of the torsion spring 16, one end 16 c and the other end 16 b are positioned on a straight line. From here the other end 16b is pushed down as shown by a dot-and-dash line, and in a state of being restrained by a jig (not shown), as shown in FIG. And the hinge shaft 13 is inserted. After the support member 12 and the attachment member 11 are connected, the other end 16 b of the torsion spring 16 abuts on the support member 12 by removing a jig (not shown).

  The abutment portion 12 j of the support member 12 biased by the torsion spring 16 abuts on the abutment portion 11 j of the mounting member 11, whereby the support member 12 is rotationally stopped at the second position P 2. At the second position P2, the torsion spring 16 is held in a stressed state between the support member 12 and the holding portion 11d, which are rotationally stopped by the abutting portions 11j and 12j. The other end 16 b of the torsion spring 16 pushes up the support member 12 to the second position P 2 and applies pressure to generate pressure between the abutment 12 j of the support 12 and the abutment 11 j of the mounting member 11. There is. As a result, the rattling of the torsion spring 16 with respect to the mounting member 11 is removed, and the torsion spring 16 is prevented from dropping off from the mounting member 11.

  In addition to this, the torsion spring 16 is held between the central portion 14a and the bottom portion 11f of the pin 14 with the pin 14 inserted inside. The pin 14 which is an example of the sandwiching member is inserted into the coil portions 16a and 16a of the torsion spring 16 and provided on the mounting member 11, and sandwiches the coil portions 16a and 16a of the torsion spring 16 with the holding portion 11d. Pin holes 14 k and 14 k are formed on opposite side surfaces of the mounting member 11. One of the pin holes 14k, 14k holds the end 14b, 14b of the pin 14 in a tight fit to prevent the pin 14 from falling off or being displaced.

  The mounting member 11 has a holding portion 11 d that holds the coil portions 16 a and 16 a of the torsion spring 16 from the outside and resists the reaction force of the auxiliary biasing force. Inside the mounting member 11, a holding portion 11d provided with a cylindrical bottom portion 11f is formed. The torsion spring 16 is sandwiched between the bottom portion 11 f and the contact surface 12 g in the above-described stress state in a state where the outer peripheral surface of the coil portion 16 a is in contact with the bottom portion 11 f.

  As shown in FIG. 5, the torsion spring 16 has a pair of coil portions 16 a and 16 a formed symmetrically with respect to a plane orthogonal to the hinge shaft 13. The wire material of the both outer sides of a pair of coil part 16a, 16a is made to continue U-shape, and the other end part 16b is formed. The torsion spring 16 is shaped so as to be symmetrical in the left-right direction by bending one continuous wire. The wire members on both outer sides of the coil portions 16a, 16a are drawn out in a cantilever shape in the tangential direction, and the tip sides are connected in a U-shape. The other end 16 b and the cantilevers 16 p and 16 p integrally connect the coil portions 16 a and 16 a. As shown in FIG. 3, since the side surface of the contact surface 12g is retracted inward from the convex portion 12e, the side surface of the contact surface 12g passes through the inside of the facing distance of the cantilevers 16p and 16p of the torsion spring 16. Therefore, while the support member 12 is moved from the first position P1 to the second position P2, the other end 16b of the torsion spring 16 rubs against the contact surface 12g of the support member 12 and continues to move.

  As shown in FIG. 5, the wire members on both inner sides of the coil portions 16a, 16a are drawn downward to form one end portions 16c, 16c. The torsion spring 16 is rotationally fixed to the mounting member 11 by inserting the one ends 16 c and 16 c into the opening 11 g of the mounting member 11.

(Position of torsion spring)
FIG. 6 is an explanatory view of a state in which the torsion spring is moved backward. FIG. 7 is an explanatory view of a state in which the torsion spring is moved downward. FIG. 8 is an explanatory view of the relationship between the opening angle of the opening / closing device and the assist torque. In FIG. 6, (a) is the first position when the torsion spring is disposed at the reference position, (b) is the second position when the torsion spring is disposed at the reference position, and (c) is the torsion spring at the rear position. This is the first position when arranged. (D) is a 2nd position at the time of arranging a torsion spring in a back position. In FIG. 7, (a) is a first position when the torsion spring is disposed at the lower position, (b) is a second position when the torsion spring is disposed at the lower position, and (c) is a rearward lower position of the torsion spring. It is a 1st position at the time of arranging at. (D) is a 2nd position at the time of arrange | positioning a torsion spring in back downward position.

  When the torsion spring 16 is used in the opening / closing device 10, the inner diameter of the torsion spring 16 may be slightly larger than the diameter of the hinge shaft 13, and the hinge shaft 13 may be held at the inner diameter of the torsion spring 16. The one end 16 c of the torsion spring 16 is engaged with the mounting member 11, and the other end 16 b is engaged with the support member 12 so that the support member 12 generates an auxiliary biasing torque around the hinge shaft 13.

  However, when the torsion spring 16 is disposed so as to surround the hinge shaft 13, the torsion spring 16 generates a torque proportional to the amount of torsional elastic deformation, so as shown as case C 0 in FIG. The relationship between the opening angle of 12 and the auxiliary biasing force is linear and monotonous. Therefore, it is difficult to finely adjust the assisting biasing force at each stage from the first position P1 to the second position P2 of the support member 12. That is, it is difficult to provide the switchgear 10 with a wide variety of auxiliary biasing force / opening angle relationships using one type of torsion spring 16.

  On the other hand, in the first embodiment, by changing the position of the coil portion 16a accommodated in the mounting member 11 as in the cases C1 to C4, various types of auxiliary biasing forces can be obtained using one type of torsion spring 16 It is possible to give the opening / closing device 10 a relationship of / open angle. It is possible to finely cope with the relationship between various types of auxiliary biasing forces / opening angles required for the switching device 10 while reducing and sharing the number of parts of the switching device 10.

  As shown in FIG. 4, as the torsion spring 16 rotates the support member 12 in the direction (P1 → P2) to reduce the auxiliary biasing force, the contact position of the other end 16 b with the support member 12 becomes the support member 12. And moves to the hinge shaft 13 side from the rotational end side of the And this movement distance delta changes according to the attachment position of the torsion spring 16 accommodated in the supporting member 12, and the auxiliary biasing force in the 1st position P1 and the 2nd position P2 changes according to movement distance delta.

  As shown to FIG. 6, FIG. 7, the attachment position of the torsion spring 16 was made to differ in four types (case C1-C4), and each auxiliary | assistant biasing force in a 1st position and a 2nd position was compared. 6 and 7, as shown in FIG. 4, the position of the bottom portion 11 f is made different according to the position of the torsion spring 16, and the position of the pin 14 is made different. That is, four types of mounting members 11 are prepared according to the cases C1 to C4, and the torsion spring 16 is sandwiched between the bottom 11f and the pin 14. The other parts are common to cases C1 to C4.

  As shown in Table 1, the auxiliary biasing force of the opening / closing device 10 was compared by the assist torque coefficient (Q) obtained by multiplying the torsion deformation angle (α) of the torsion spring 16 by the action radius (R16, S16). . The assist torque coefficient (Q) is a value obtained by dividing the assist torque by the torsion elastic coefficient of the torsion spring.

  The angle α is an angle obtained by torsional elastic deformation from an unloaded state in which both ends are on the same plane. The movement distance Δ is a distance by which the other end 16b moves on the contact surface 12g in the process of moving the support member 12 from the first position P1 to the second position P2. FIG. 8 shows a schematic comparison image of changes in assist torque coefficient (Q) from the first position P1 to the second position P2 in the cases C1 to C4.

  As shown to (a) of FIG. 6, case C1 arrange | positions the torsion spring 16 in the reference (standard) position. The height H16 from the center of the hinge shaft 13 to the center of the coil portion 16a is 15.5 mm. The horizontal distance D16 from the center of the hinge shaft 13 to the center of the coil portion 16a is 10.0 mm. As shown in Table 1, in case C1, the assist torque coefficient at the first position P1 is 2700, the assist torque coefficient at the second position P2 is 304, and the first for the original cover (3: FIG. 1). The assist torque coefficient at the 1 position P1 was determined to be excessive.

  As shown in FIG. 6C, the case C2 moves the torsion spring 16 rearward by 5 mm from the reference position. The height H16 from the center of the hinge shaft 13 to the center of the coil portion 16a is 15.5 mm. The horizontal distance D16 from the center of the hinge shaft 13 to the center of the coil portion 16a is 5.0 mm. As shown in Table 1, in case C2, the assist torque coefficient at the first position P1 is 2250, and the assist torque coefficient at the second position P2 is 413, and the first for the original cover (3: FIG. 1). The assist torque coefficient at the 2 position P2 was judged to be excessive.

  As shown in FIG. 7A, the case C3 moves the torsion spring 16 downward by 4.5 mm from the reference position. The height H16 from the center of the hinge shaft 13 to the center of the coil portion 16a is 20.0 mm. The horizontal distance D16 from the center of the hinge shaft 13 to the center of the coil portion 16a is 10.0 mm. As shown in Table 1, in case C3, the assist torque coefficient at the first position P1 is 2056, and the assist torque coefficient at the second position P2 is 118, and the first for the original cover (3: FIG. 1). It was determined that the assist torque coefficient at the 2 position P2 was insufficient.

  As shown in (c) of FIG. 7, the case C4 moves the torsion spring 16 downward by 4.5 mm from the reference position and moves the same backward 5.0 mm. The height H16 from the center of the hinge shaft 13 to the center of the coil portion 16a is 20.0 mm. The horizontal distance D16 from the center of the hinge shaft 13 to the center of the coil portion 16a is 5.0 mm. As shown in Table 1, in case C4, the assist torque coefficient at the first position P1 is 1677, and the assist torque coefficient at the second position P2 is 190, and the first for the original cover (3: FIG. 1). The assist torque coefficients at the first position P1 and the second position P2 were determined to be appropriate.

  As shown in FIG. 8, the case C0 is a schematic image of the change in assist torque coefficient (Q) from the first position P1 to the second position P2 when the torsion spring 16 is disposed with the hinge shaft as the center. . In the case C0, since the action radius of the torsion spring 16 is constant, the assist torque coefficient (Q) linearly changes in proportion to the torsion deformation angle of the torsion spring. Therefore, it is not possible to obtain the desired cosine curve assist torque change for supporting the weight of the original cover (3: FIG. 1).

  On the other hand, in the case C1, since the hinge shaft 13 is disposed outside the torsion spring, the action position gradually moves toward the hinge shaft 13 in conjunction with the opening operation, and the assist torque change close to the cosine curve You can get However, the assist torque required at the first position P1 and the assist torque required at the second position P2 can not be simultaneously satisfied.

  On the other hand, in the cases C2 to C4, the assist torque at the first position P1 and the second position P2 in the cosine curve assist torque change is made by shifting the center position of the torsion spring in the height direction and the horizontal direction. Is changing. Then, the case C4 that meets the condition of the cosine curve necessary to support the weight of the original cover (3: FIG. 1) is reached. That is, with the torsion spring 16, the hinge shaft 13 and the support member 12 as common parts, it is possible to select the mounting position of the torsion spring 16 simultaneously satisfying the assist torque required at the first position P1 and the assist torque required at the second position P2. .

(Effect of Example 1)
In the first embodiment, the torsion spring 16 is continuous with the coil portion 16a wound with the wire of elastic material and accommodated in the mounting member, and abuts on the coil member 16a at a position away from the hinge shaft 13 of the support member 12. It has the other end 16b which applies a twisting force. For this reason, the slider required when using a compression coiled spring is abbreviate | omitted, and the switchgear which can implement | achieve cost reduction by reducing a number of parts can be provided. Further, since the other end 16b contacts the support member 12 at a position away from the coil portion 16a generating the auxiliary biasing force, the posture of the entire torsion spring 16 is unstable even if the rotation of the support member 12 is repeated at high speed. It is possible to output a stable, highly reproducible auxiliary biasing force.

  In the first embodiment, in the torsion spring 16, the contact position of the other end 16 b with the support member 12 is hinged from the rotation end side of the support member 12 as the support member 12 rotates in the direction to reduce the auxiliary biasing force. Move to the shaft 13 side. Therefore, the variation of the assist torque / opening angle relationship in the rotation range from the first position P1 to the second position P2 of the support member 12 is increased, and various types of assist torque / opening angle required for the opening / closing device 10 are increased. It can respond finely to the relationship of

  In the first embodiment, the torsion spring 16 has a pair of coil portions 16a, 16a formed symmetrically with respect to a plane orthogonal to the hinge shaft 13, and U-shaped wire members on both outer sides of the coil portions 16a, 16a. To form the other end 16b. Therefore, even if the other end 16b long in the tangential direction is supported at both ends, the posture can be stabilized and can be made to abut on the support member 12 with uniform pressure distribution. Therefore, there is no need to provide a separate member for stabilizing the posture of the other end 16b to which pressure is applied.

  In the first embodiment, the mounting member 11 has a holding portion 11 d that holds the coil portion 16 a of the torsion spring 16 from the outside and resists the reaction force of the auxiliary biasing force. Therefore, even without providing a separate member for supporting the coil portions 16a and 16a to stabilize the posture, the torsion spring 16 can be stably operated to output a stable, highly reproducible auxiliary biasing force. .

  In the first embodiment, one mounting member 11 is selected from a plurality of options in which the holding position of the coil portion 16a by the holding portion 11d is made different. Therefore, it is possible to provide the opening / closing device 10 with various assist output characteristics by commonly using parts such as the support member 12, the hinge shaft 13, and the torsion spring 16 and the like.

  In the first embodiment, the torsion spring 16 is rotationally fixed by inserting one end portion 16c obtained by pulling down the wire members on both inner sides of the pair of coil portions 16a and 16a into the opening 11g of the mounting member 11. For this reason, there is no need to attach the rotation stopping members of the coil portions 16a, 16a to the mounting member 11.

  FIG. 9 is an explanatory view of the configuration of the switchgear of the second embodiment. As shown in FIG. 4, in the first embodiment, the contact surface 12 g of the support member 12 on which the other end 16 b of the torsion spring 16 contacts and moves is flat. On the other hand, as shown in FIG. 9, in the second embodiment, the cam surface has a cross-sectional shape perpendicular to the hinge shaft 13 projected to the torsion spring 16 side on the surface on which the other end 16b of the support member 12 moves. It has 12k. In the second embodiment, the configuration other than the cam surface 12k is the same as that of the first embodiment, and therefore in FIG. 9, the same reference numerals as in FIG. I omit it.

  The cam surface 12k guides the other end 16b to change the relationship between the rotation angle of the support member 12 from the first position P1 to the second position P2 and the amount of torsional elastic deformation of the torsion spring 16. The distance between both side surfaces of the portion where the cam surface 12k of the support member 12 is formed is smaller than the opposing distance inside the cantilever 16p supporting the other end 16b of the torsion spring 16 shown in FIG. Therefore, the other end 16b of the torsion spring 16 is not disturbed by the convex portion of the cam surface 12k as shown by the one-dotted chain line in FIG. It rubs continuously and moves.

  According to the second embodiment, since the support member 12 has the cam surface 12k, the change pattern of the auxiliary biasing force during rotation of the support member 12 from the first position P1 to the second position P2 is flat as in the first embodiment. Different from the contact surface (12 g: FIG. 4). That is, at a portion where the cross-sectional shape protrudes to the torsion spring 16 side, the amount of torsional elastic deformation of the torsion spring 16 becomes larger than that of the first embodiment. For this reason, as shown in FIG. 8, it is possible to obtain a pattern of an auxiliary biasing force like case C5 in which the curve of case C4 is partially lifted upward between the first position P1 and the second position P2. . Therefore, by setting the cam curve according to the pattern of the necessary auxiliary biasing force in the rotation range from the first position P1 to the second position P2 to the cam surface 12k, many types of switching devices 10 are required. It is possible to respond finely to the relationship between assist torque and opening angle.

  As shown in FIG. 6, in the first embodiment, the attachment biasing force can be changed for each individual opening / closing device 10 by changing the attachment member 11. However, in addition to this, it is desirable that the opening / closing device 10 can finely adjust the auxiliary biasing force while using the same mounting member.

By the way, the adjustment mechanism of the general auxiliary adjustment force in the conventional switchgear using a compression coil spring provides a base between the bottom of the mounting member and the compression coil spring, and turns a screw from the outside of the bottom of the mounting case The height of the pedestal can be changed. By changing the height of the pedestal, the biasing force of the compression coil spring that lifts the slider is adjusted. However, the pedestal is larger than the diameter of the compression coil spring, and a thick screw is required to keep it horizontal at a position away from the bottom of the mounting case. And, these added large parts hinder the miniaturization and cost reduction of the switchgear.
Therefore, in the third embodiment, as shown in FIG. 10, the auxiliary biasing force of the torsion spring 16 can be adjusted by moving the restraining position of the one end portion 16c of the torsion spring 16 in the first embodiment back and forth. Except for this adjustment mechanism, the second embodiment is the same as the first embodiment, and therefore, in FIG. 10, the same members as those of the first embodiment are denoted by the same reference numerals as those in FIG.

  FIG. 10 is an explanatory view of the configuration of the switchgear of the third embodiment. As shown in FIG. 10, the first arm holder 18 holds one end 16 c of the torsion spring 16. By rotating the adjustment screw 19 inserted into the female screw 11 n of the mounting member 11, the first arm holder 18 moves and positions the first arm holder 18 in the rotational axis direction of the adjustment screw 19. It is possible.

  In the third embodiment, the one end 16 c is held by the first arm holder 18 provided so as to be adjustable in position with respect to the mounting member 11 in order to adjust the auxiliary biasing force. Therefore, by manually operating the adjustment screw 19 from the outside of the mounting member 11 and rotating it, the level of the entire pattern of necessary auxiliary biasing force in the rotation range from the first position P1 to the second position P2 can be raised and lowered. It is adjustable.

  FIG. 11 is an explanatory view of the configuration of the switchgear of the fourth embodiment. FIG. 12 is an exploded perspective view of the switchgear of the fourth embodiment. FIG. 13 is an explanatory diagram of the operation of the switchgear according to the fourth embodiment. In FIG. 13, (a) is a second position, (b) is an intermediate position, and (c) is a first position. As shown in FIG. 4, in the first embodiment, the torsion spring 16 exerts a large auxiliary biasing force on the support member 12 also at the first position P1. Therefore, in the closed state of the original cover 3 shown in FIG. 1A, the force with which the original cover 3 presses the original to the image reading apparatus 2 may be insufficient. Therefore, in the fourth embodiment, when the opening angle becomes equal to or less than a predetermined angle in the process of closing the original cover 3, the auxiliary biasing force output by the opening / closing device 10 is reduced, and the original cover 3 is used as the image reader 2. The pressing force was increased. In the fourth embodiment, the configuration other than the cam surface 12k formed on the support member 12 and the rotation stopping portion of the torsion spring 16 is the same as that of the first embodiment, and therefore, the configuration common to the first embodiment in FIGS. The same reference numerals as in FIG.

(Rotation stop)
As shown in FIG. 11, in the fourth embodiment, the bottom 11f of the mounting member 11 is formed with an opening 11g bent outward on the way to the lower side. The one end portion 16c of the torsion spring 16 is engaged with the bent corner 11h of the opening 11g, whereby the torsion spring 16 is rotationally fixed to the mounting member 11 more firmly than the first embodiment. For this reason, in Example 3, the pin 14 shown in FIG. 4 is not provided. The one end portion 16c is formed by folding the end portion of the wire forming the coil portion 16a into a shallow U-shape (whip shape). The torsion spring 16 is held between the holding portion 11 d of the mounting member 11 and the top portion 12 p of the support member 12 in a state in which the torsion spring 16 is elastically deformed.

(Assembly structure of switchgear)
As shown in FIG. 11, the supporting member 12 has a predetermined opening angle of the lid 3 with respect to the device body 2 on the surface of the supporting member 12 on which the other end 16 b of the torsion spring 16 abuts and moves. The cam surface 12k is formed to reduce the amount of torsional elastic deformation of the torsion spring 16 in the following range. As shown in FIG. 12, the thickness of the convex portion 12e is larger than the distance between the cantilevers 16p and 16p of the torsion spring 16, and the thickness of the receding portion 12f is equal to that of the cantilevers 16p and 16p of the torsion spring 16. Less than the interval. Therefore, when the contact position of the other end 16b of the torsion spring 16 exceeds the top 12p of the cam surface 12k as the support member 12 pivots in the closing direction, the receding portion 12f is cantilevered 16p, 16p. The amount of torsional elastic deformation of the torsion spring 16 is reduced. As a result, the auxiliary biasing force of the torsion spring 16 acting on the support member 12 is reduced.

  As shown in FIG. 13A, at the second position P2, the torsion spring 16 pushes up the support member 12 and biases the support member 12 in the counterclockwise direction in the figure around the hinge shaft 13. . The support member 12 is stopped at a position where the abutting portion 12 j of the supporting member 12 abuts on the abutting portion 11 j of the mounting member 11.

  As shown in FIG. 13B, the cam surface 12k is the other end of the torsion spring 16 from the second position P2 until the other end 16b of the torsion spring 16 reaches the top 12p of the cam surface 12k. The portion 16 b is pushed down to increase the amount of torsional elastic deformation of the torsion spring 16. Along with this, the auxiliary biasing force of the torsion spring 16 acting on the mounting member 12 increases. Thereafter, when the torsion spring 16 reaches the top 12p of the cam surface 12k, the other end 16b of the torsion spring 16 is lifted following the cam surface 12k, and the amount of torsional elastic deformation of the torsion spring 16 is reduced. Along with this, the auxiliary biasing force of the torsion spring 16 acting on the mounting member 12 is reduced, and as shown in FIG. 1B, the apparent weight of the original cover 3 mounted on the mounting member 12 is increased. .

  When the support member 12 reaches the first position P1 as shown in (c) of FIG. 13, as shown in (a) of FIG. 1, the original cover 3 attached to the mounting member 12 exerts a large force on the original Is pressed to the image reading device 2. Therefore, while the original cover 3 can be lightly opened and closed, the original can be pressed against the image reading device 2 with a sufficient force to improve the image reading accuracy.

(Other embodiments)
The switchgear of the present invention is not limited to the specific configuration and application described in the above-described embodiment. It is also possible to implement another form in which part or all of the configuration of the embodiment described above is replaced with an equivalent configuration. In the first embodiment, the opening / closing device 10 for attaching the original cover 3 of the copying machine 1 to the image reading device 2 has been described. However, the opening / closing device 10 can also be used in various information terminal devices such as a copying machine, a printing machine, a multifunction machine, a scanner, or a toilet bowl or various production facilities.

  In the first embodiment, the mounting member 11 is mounted on the device body side, and the support member is mounted on the lid. However, with the relationship between the device body side and the lid side being substantially omitted, the opening / closing device 10 can also be implemented in an embodiment in which the mounting member 11 is attached to the lid and the support member is attached to the device body.

  In the first embodiment, the other end portion 16b is supported at both ends by cantilevers 16p, 16p extended from the pair of coil portions 16a, 16a. However, the other end portion 16b may be supported by cantilevers extended from both inner sides of the coil portions 16a, 16a, and the cantilevers extended tangentially from one end side of one coil portion. The tip may be bent on a circular arc. The other end 16 b may be in rolling contact with the support member 12 using a roller or a collar.

  Since the present invention is configured as described above, in particular, a switching device of the type that generates an auxiliary biasing force (torque) using a torsion spring, and various information terminal devices equipped with such a switching device, for example, copying It is suitably used as a machine, a printing machine, a multifunction machine, a scanner or the like, or a toilet or various production equipment.

1 Photocopier (information terminal equipment)
2 Image reader (apparatus body side)
3 Original cover (cover side)
Reference Signs List 5 glass plate 6 operation unit 10 opening and closing device 11 mounting member 11a bearing 11b bearing 11b shaft hole 11d holding portion 11f bottom 11g opening 11h corner 11j contact portion 12 support 12a mounting member 12a mounting 12b shaft hole 12c mounting hole 12e convex 12f Portion 12g Abutment surface 12j Abutment portion 12k Cam surface 12p Apices 13 Hinge shaft 13a Central portion 13b End portion 14 Pin (Nipping member)
16 Torsion spring 16a Coil portion 16b Other end portion 16c One end portion P1 First position P2 Second position

Claims (11)

A case-like mounting member mounted on the device body side, a support member mounted on the lid side, a hinge shaft rotatably connecting the support member to the mounting member, and an auxiliary biasing force on the support member An opening / closing device having an auxiliary biasing means to operate.
The auxiliary biasing means is constituted by a torsion spring which is accommodated in a fixed manner in the case-like mounting member, one end of which is in contact with the mounting member and the other end of which is in contact with the support member. ing,
A switching device characterized by The mounting member is detachably mounted in a mounting hole provided at the rear upper end of the device body, vertically mounted at the rear upper end of the device body, or horizontal at the rear upper end of the device body Attached to the device body by any one of the following methods:
A switchgear according to claim 1, characterized in that. The mounting member has a holding portion that holds the coil portion of the torsion spring from the outside and resists the reaction force of the auxiliary biasing force.
A switchgear according to claim 1, characterized in that. The mounting member has a holding portion that holds the coil portion of the torsion spring from the outside and resists the reaction force of the auxiliary biasing force.
The switchgear according to claim 2, characterized in that: The support member has a cam surface in which a cross-sectional shape perpendicular to the hinge shaft protrudes toward the torsion spring on the surface on which the other end portion of the torsion spring abuts and moves the support member.
A switchgear according to claim 1, characterized in that. In the torsion spring, the contact position of the other end of the torsion spring with respect to the support member is from the rotation end side of the support member as the support member rotates in the direction to reduce the auxiliary biasing force. Move to the hinge shaft side,
A switchgear according to claim 1, characterized in that. The torsion spring has a pair of coil portions formed symmetrically with respect to a plane orthogonal to the hinge shaft, and the wire rods on both outer sides of the pair of coil portions are made to continue in a U-shape to obtain the torsion spring The other end is formed,
A switchgear according to claim 1, characterized in that. The torsion spring has a pinching member which is inserted into the coil portion and provided on the attachment member and which pinches the coil portion of the torsion spring with the holding portion.
The switchgear according to claim 3 or 4, characterized in that: One end portion of the torsion spring is held by a holding portion provided so as to be position adjustable with respect to the attachment member in order to adjust the auxiliary biasing force.
A switchgear according to claim 1, characterized in that. The supporting member is a surface of the supporting member on which the other end of the torsion spring abuts and moves, and the amount of torsional elastic deformation of the torsion spring within a range where the opening angle of the lid with respect to the device body is a predetermined angle or less. Having a cam surface formed to lower the
A switchgear according to claim 1, characterized in that. It has the switchgear of any one of Claims 1-10,
The device body side and the lid are openably connected by the opening / closing device,
An information terminal device characterized by

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