JP2010238521A - Switch mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch mechanism which achieves a stable switching operation regardless of clearance between a driven cam member and a driving cam member by improving a structure of sliding surface of the driven cam member and the driving cam member. <P>SOLUTION: In a water supply switch 73, a leaf contact piece 731 is urged toward the driven cam member 55b. After being displaced by a convex cam portion 556, the leaf contact piece urges the convex cam portion 556 so as to rotate the driven cam member 55b earlier than the driving cam member 55a and return to the state before displacement. Between the driven cam member 55b and the driving cam member 55a, there is arranged a circular arc sliding surface 550 which includes a circular arc sliding recessed portion 554a having an arc angle of 180° or less and a circular arc sliding projection portion 552a having the same curvature radius as that of the circular arc sliding recessed portion 554a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a switch mechanism that, after displacing a switching movable member with a cam portion, instantaneously returns the switching movable member to a state before displacement.

  For example, as shown in FIG. 13, as a switch mechanism for returning the switching movable member to the state before the displacement instantaneously after the switching movable member is displaced by the cam portion, Some have a driven cam member 1010, a shaft-like driving cam member 1020 that rotationally drives the driven cam member 1010, and a switching movable member 1030 biased toward the driven cam member 1010 ( For example, see Patent Document 1).

  In such a switching mechanism, the key portion 1021 of the driving cam member 1020 is fitted in the recess 1015 of the driven cam member 1010 with play in the circumferential direction. For this reason, since the switching movable member 1030 is pressed and displaced by the cam portion 1001, the cam portion 1001 is urged to cause the driven cam member 1010 to rotate ahead of the driving cam member 1020. Can be instantly restored. Here, since the inner peripheral surface of the driven cam member 1010 and the outer peripheral surface of the driving cam member 1020 are both perfect circles, the driven cam member 1010 rotates while being supported by the driving cam member 1020. be able to.

JP 2002-279879 A

  However, in the switching mechanism shown in FIG. 13, the inner peripheral surface of the driven cam member 1010 and the outer peripheral surface of the driving cam member 1020 are both perfect circles. Therefore, if the clearance between them is large, the driven cam member 1010 swings eccentrically with respect to the drive cam member 1020. If such a swing occurs, a stable switch operation cannot be performed, which is not preferable. However, if the clearance between the inner peripheral surface of the driven cam member 1010 and the outer peripheral surface of the driving cam member 1020 is small, the driven cam member 1010 can smoothly advance with respect to the driving cam member 1020. As a result, a stable switch operation cannot be performed. Such a variation in clearance occurs due to shrinkage or expansion of the member accompanying a change in environmental temperature, in addition to the influence of dimensional accuracy during manufacturing.

  In view of the above problems, an object of the present invention is to improve the configuration of the sliding surfaces of the driven cam member and the driving cam member, thereby affecting the clearance between the driven cam member and the driving cam member. It is an object of the present invention to provide a switch mechanism that can realize a stable switch operation.

  In order to solve the above-described problems, in the present invention, a driven cam member provided with a cam portion is engaged with a driven cam member with play in a circumferential direction, and the driven cam member is driven to rotate. After being biased toward the cam member and the driven cam member and being displaced by the cam portion, the cam portion is biased so that the driven cam member is rotated in advance with respect to the drive cam member, In the switch mechanism having a switching movable member that returns to the state before the displacement, between the driven cam member and the driving cam member, the driven cam member and the driving cam member are arranged between the driven cam member and the driving cam member. An arcuate sliding surface is constituted by an arcuate sliding recess formed on one member and an arcuate sliding convex formed on the other member with the same radius of curvature as the arcuate sliding recess, Arc-shaped sliding Parts and at least one of the arc angle of the arcuate sliding protrusions, and characterized in that a 180 ° or less.

  In the present invention, the switching movable member is displaced by being pressed by the cam portion, and then the cam portion is urged to cause the driven cam member to rotate ahead of the driving cam member, so that the state before the displacement is instantaneously restored. can do. Here, since an arcuate sliding surface is formed between the driven cam member and the driving cam member, the driven cam member is guided by the driving cam member and rotates. Here, the arcuate sliding surface has an arcuate sliding recess formed in one of the driven cam member and the driving cam member, and the other radius of curvature with the same radius of curvature as the arcuate sliding recess. The arc-shaped sliding convex portion formed on the member has an arc angle of 180 ° or less of at least one of the arc-shaped sliding concave portion and the arc-shaped sliding convex portion. Therefore, the driven cam member is not eccentric with respect to the drive cam member regardless of the size of the clearance between the driven cam member and the drive cam member, and the driven cam member and the drive cam member are driven. The sliding resistance with the cam member for use is not excessively increased. Therefore, a stable switching operation can be performed.

  In the present invention, for example, the one member is the driven cam member, and the other member is the driving cam member.

  In the present invention, the one member is a ring-shaped member in which the arc-shaped sliding concave portion is formed on the inner peripheral side surface, and the other member is the ring having the arc-shaped sliding convex portion on the outer peripheral side surface. It is preferable to provide a shaft-like portion that fits inside the shaped member. According to such a configuration, since the shaft-like portion of the other member is always supported inside the one member, no means for preventing the one member from separating from the other member is required. There is an advantage.

  In the present invention, on the inner peripheral side surface of the ring-shaped member, the portion displaced in the circumferential direction with respect to the arc-shaped sliding recess is a large-diameter portion having a larger curvature radius than the arc-shaped sliding recess. It is preferable.

  In the present invention, on the outer peripheral side surface of the shaft-shaped portion, the portion shifted in the circumferential direction with respect to the arc-shaped sliding convex portion is a small-diameter portion having a smaller radius of curvature than the arc-shaped sliding convex portion. A configuration may be adopted.

  In the switching mechanism of the present invention, the switching movable member is displaced by being pressed by the cam portion, and then biases the cam portion to cause the driven cam member to rotate ahead of the driving cam member. It can return instantly. Here, since an arcuate sliding surface is formed between the driven cam member and the driving cam member, the driven cam member is guided by the driving cam member and rotates. Here, the arcuate sliding surface has an arcuate sliding recess formed in one of the driven cam member and the driving cam member, and the other radius of curvature with the same radius of curvature as the arcuate sliding recess. The arc-shaped sliding convex portion formed on the member has an arc angle of 180 ° or less of at least one of the arc-shaped sliding concave portion and the arc-shaped sliding convex portion. Therefore, the driven cam member is not eccentric with respect to the drive cam member regardless of the size of the clearance between the driven cam member and the drive cam member, and the driven cam member and the drive cam member are driven. The sliding resistance with the cam member for use is not excessively increased. Therefore, a stable switching operation can be performed.

(A), (B) is the perspective view which looked at the ice making apparatus to which this invention is applied from the side in which a case is located, respectively, and the perspective view seen from the side in which an end plate is located. (A), (B), (C) is a perspective view of a scraping member, an ice tray, and a guide member used in the ice making device shown in FIG. (A), (B), and (C) are respectively a front view of the ice making device shown in FIG. 1 as viewed from the front side, a cross-sectional view showing a state in which the scraping member of the ice making device is at the origin position, and the scraping member from the origin position. It is sectional drawing which shows the state rotated. It is a block diagram which shows schematic structure of the drive unit of the ice making apparatus shown in FIG. It is a block diagram which shows schematic structure of the drive unit of the ice making apparatus shown in FIG. It is a timing chart figure which shows operation | movement of the ice making apparatus shown in FIG. In the ice making device shown in FIG. 1, it is explanatory drawing of the inner case used for the drive unit, and the member arrange | positioned in this inner case. (A), (B), (C) are respectively a side view of the rotating cam body shown in FIG. 7, a perspective view of a state where leaf contact pieces are arranged on the rotating cam body, and rotation in the ice making device shown in FIG. It is a disassembled perspective view of a cam body. In the ice making device shown in FIG. 1, it is explanatory drawing of the base plate used for the drive unit, and the member arrange | positioned in this ground plate on the side facing an outer case. It is explanatory drawing of the three leaf contact pieces which comprise a main switch in the ice making apparatus shown in FIG. It is explanatory drawing of the water supply switch comprised in the ice making apparatus shown in FIG. It is explanatory drawing which shows operation | movement of the drive unit of the ice making apparatus shown in FIG. It is explanatory drawing of a switch mechanism.

  Hereinafter, an example in which a switch mechanism according to the present invention is mounted on a water supply switch of an ice making device will be described with reference to the drawings.

[overall structure]
1A and 1B are a perspective view of an ice making device to which the present invention is applied as seen from the side where the case is located, and a perspective view as seen from the side where the end plate is located. 2A, 2B, and 2C are perspective views of a scraping member, an ice tray, and a guide member used in the ice making device shown in FIG. 3A, 3B and 3C are front views of the ice making device shown in FIG. 1 as viewed from the front side, a cross-sectional view showing a state where the scraping member of the ice making device is at the origin position, and the scraping member being the origin point. It is sectional drawing which shows the state rotated from the position.

  1 (A), (B), FIGS. 2 (A), (B), (C), and FIGS. 3 (A), (B), (C), the ice making device 1 of this embodiment is a refrigerator. Or it is an apparatus for producing ice continuously in the freezer and automatically discharging the produced ice to the lower ice storage unit 1a, an ice making unit 2 for producing ice, and an ice scraping operation, etc. And a drive unit 3 (drive control unit) for controlling. An ice detecting lever 60 extends from the drive unit 3 toward the lower ice storage portion 1a.

  The ice making unit 2 scrapes out the ice made in the ice making plate 21 in the ice making plate 21, the water supply unit 22 for supplying water to the ice making plate 21 at the side (rear side) of the ice making plate 21, and the deicing mechanism 1f. A scraping member 23, a guide member 24 for guiding the ice scraped by the scraping member 23 to the ice storage unit 1a located below the ice tray 21, and the drive unit 3 on the right side of the ice tray 21 And an end plate 25 (ice detecting lever support portion) standing upright.

  The ice tray 21 is made of aluminum and is subjected to surface treatment such as coating or anodizing. A plurality of ice making grooves 215 (ice making recesses) are partitioned and formed on the upper surface of the ice making tray 21 by the partition plate 218, and the water supplied from the water supply unit 22 is stored in each of the plurality of ice making grooves 215. There it freezes. On the bottom surface of the ice tray 21, a heater 26 for heating the bottom surface of the ice tray 21 when the ice is discharged from the ice tray 21 is disposed. The heater 26 is connected to the ice tray 21 by a method such as caulking. It is integrated. Two rubber-made terminal portions 262 project from the heater 26 on the left side surface portion of the ice tray 21, and terminals 261 project from the front end surfaces of the two terminal portions 262. In the ice tray 21, a test temperature portion 219 with which a thermostat (described later) for monitoring the temperature of the ice tray 21 abuts is formed in a region sandwiched between the two terminal portions 262.

  The water supply unit 22 is arranged on the opposite side (rear side) to the ice discharge tray 21 from which ice is discharged (front side), and includes a water supply port 221 that opens at the rear wall of the ice tray 21. . Water is supplied to the water supply unit 22 from a water supply pipe 228, and a water supply pump 220 is connected to the water supply pipe 228 as schematically shown in FIG.

  The scraping member 23 includes a rotation shaft 231 extending in the left-right direction at a position above the ice tray 21 and a plurality of scraping portions 232 protruding in a nail shape from the rotation shaft 231 in the same direction. There is a one-to-one correspondence with the ice making groove 215. The right end of the rotating shaft 231 is rotatably supported by a notch 211 formed at the edge of the right side 217 of the ice tray 21 and can be rotated by a shaft hole 251 formed in the end plate 25. It is supported. In addition, the rotation shaft 231 has a flange portion 239 formed on the right end thereof in contact with the inner surface of the end plate 25, and movement of the rotation shaft 231 to the right is restricted. On the other hand, the other end of the rotating shaft 231 is a D-cut portion 230 and is connected to a rotating cam body 55 (cam body) disposed in the drive unit 3 as shown in FIG. ing.

  In such a deicing mechanism 1f, the position of the scraping portion 232 shown in FIG. 3B is the origin position, and at this origin position, the scraping portion 232 is on the side where the water supply port 221 is disposed across the rotation shaft 231. It is in a state tilted toward the opposite side. From this state, while the rotating shaft 231 rotates in the direction indicated by the arrow A and shifts to the posture shown in FIG. 3C, the scraping unit 232 causes the ice in the ice making groove 215 to float from the ice making tray 21. The ice floating from the ice tray 21 by the scraping portion 232 slides on the top surface of the scraping portion 232 and the guide member 24 and falls from the front side of the ice tray 21 to the ice storage portion 1a. In addition, there is a possibility that the ice that has floated from the ice tray 21 does not fall into the ice storage part 1a only when the scraping part 232 is shifted from the state shown in FIG. 3 (B) to the state shown in FIG. 3 (C). Until the scraping portion 232 returns to the origin position shown in FIG. 3 (B), the ice floating from the ice tray 21 completely falls to the ice storage portion 1a.

[Schematic configuration of drive unit and its basic operation]
4 and 5 are block diagrams showing a schematic configuration of the drive unit of the ice making device shown in FIG. FIG. 6 is a timing chart showing the operation of the ice making device shown in FIG.

  As will be described in detail later, the drive unit 3 of the ice making device 1 of the present embodiment includes a thermostat 91 for monitoring the temperature of the ice tray 21 and a motor 5 for driving the rotary shaft 231 as shown in FIG. 3A, a main switch 72 that opens and closes in conjunction with the rotating operation of the rotating cam body 55, and a water supply switch 73 that controls the water supply pump 220 in conjunction with the rotating operation of the rotating cam body 55 (water supply control). ), An ice detecting switch 71 for monitoring whether the ice storage unit 1a is short of ice or full (ice full), and a fuse 1g. Further, as will be described later, the ice making device 1 also includes a transmission mechanism that transmits the rotation output of the motor 5 to the rotating cam body 55, a torque limiter that is inserted in the middle of the transmission mechanism, and the like.

  In this embodiment, a commercial power source is used as the power source V, and commercial power is supplied to the motor 5, the electric motor of the water supply pump 220, and the heater 26. Further, the electric motor of the water supply pump 220 and the water supply switch 73 are electrically connected in series, and in conjunction with the connection of the water supply switch 73, the supply of commercial power to the electric motor of the water supply pump 220 is controlled. The

  Hereinafter, the basic operation of the ice making device 1 will be described with reference to the chart shown in FIG. First, after water is supplied from the water supply port 221 to the ice tray 21, ice making in the ice tray 21 is started. Meanwhile, power supply to the motor 5 and the heater 26 is stopped, and the scraping portion 232 is stopped at the origin position inclined to the side opposite to the water supply port 221 as shown in FIG. In this state, as shown in FIG. 4A, the main switch 72 is in the first state, and the thermostat 91 and the water supply switch 73 are in the off state. Further, the ice detection switch 71 is in an ice shortage state (first state).

  Then, at the time T0, when the thermostat 91 is turned on as shown in FIG. 4B in the monitoring result of the ice tray 21 by the thermostat 91, as shown in FIG. 5 and energization of the heater 26 are started. As a result, the rotating cam body 55 rotates, and accordingly, the scraping member 23 starts rotating in the direction indicated by the arrow A in FIG. 3B and the heater 26 starts heating the ice tray 21. .

  Next, at time T1, the main switch 72 switches to the second state as shown in FIG. However, even when the main switch 72 is switched to the second state, the energization of the motor 5 and the energization of the heater 26 are continued. For this reason, the scraping member 23 is driven by the motor 5, and the tip of the scraping portion 232 comes into contact with the upper surface of the ice produced in the ice tray 21. However, at this time, the temperature of the ice tray 21 is low, and the ice adhering power in the ice tray 21 is large. For this reason, the rotation of the scraping member 23 is blocked by the ice in the ice tray 21, and stops while the tip of the scraping portion 232 is in contact with the top surface of the ice in the ice tray 21. Here, since a torque limiter is inserted in the middle of the power transmission path from the motor 5 to the scraping member 23, the motor 5 continues to rotate while the rotation of the scraping member 23 is stopped, The torque limited by the limiter 8 continues to act on the ice.

  When the ice is peeled off from the ice tray 21 by the heating of the heater 26, the scraping member 23 connected to the rotating cam body 55 starts to rotate in the direction of scraping out the ice and proceeds to the ice detecting operation. At time T2, first, the tip of the ice detecting lever 60 moves upward from the ice storage chamber 1a. As a result, the ice detecting switch 71 once switches from the first state to the second state as shown in FIG. Before and after this, the discharge of ice begins, and after all the ice made has fallen into the ice storage chamber 1a, the tip of the ice detecting lever 60 descends again toward the ice storage chamber 1a at time T3. To do. At that time, if the ice storage chamber 1a is in a state of insufficient ice, the tip of the ice detecting lever 60 can move downward, so that the ice detecting switch 71 is in the second state as shown in FIG. Return from the state to the first state.

  Next, at the time T4, when the temperature of the ice tray 21 exceeds a predetermined temperature in the monitoring result for the ice tray 21 by the thermostat 91, the thermostat 91 is turned off as shown in FIG. The energization to the heater 26 is stopped. However, energization of the motor 5 is continued.

  Next, at time T5, as shown in FIG. 5B, when the water supply switch 73 is turned on, supply of commercial power to the water supply pump 220 is started, and water supply to the ice tray 21 via the water supply port 221 is started. Is done. At that time, since the resistance value of the heater 26 is low, the heater 26 is used as a part of the wiring when the water supply pump 220 is energized. At this time, the scraping portion 232 has already passed through the vicinity of the water supply port 221 completely and is inclined toward the side opposite to the side where the water supply port 221 is disposed.

  Next, at time T6, as shown in FIG. 5C, when the water supply switch 73 is turned off, the power supply to the water supply pump 220 is stopped, and the water supply to the ice tray 21 is completed through the water supply port 221. To do. Next, at time T <b> 7, power supply to the motor 5 is stopped, and the scraping portion 232 stops at the origin position inclined to the side opposite to the water supply port 221. Meanwhile, the main switch 72 returns to the first state as shown in FIG. In the ice tray 21, ice making is performed again, and the above operation is repeated thereafter.

  When the tip of the ice detecting lever 60 moves upward from the ice storage chamber 1a at time T2, when the ice storage chamber 1a is lowered toward the ice storage chamber 1a at time T3, the ice storage chamber 1a becomes full. If there is, the tip portion of the ice detecting lever 60 cannot move downward, so that the ice detecting switch 71 remains in the second state as shown in FIG. However, since the energization of the heater 26 and the motor 5 is continued even in this state, the operation until returning to the origin is performed. However, in the subsequent operation, if the ice storage chamber 1a is in a full ice state, the ice detecting switch 71 remains in the second state as shown in FIG. Even if the thermostat 91 is turned on when the temperature is lower than the predetermined temperature, the heater 26 and the motor 6 are not energized. Therefore, energization of the heater 26 and the motor 6 is started when the ice in the ice storage chamber 1a decreases and the ice detecting switch 71 returns from the second state to the first state.

  Therefore, in the ice making device 1 of this embodiment, the ice can be continuously produced and the produced ice can be automatically discharged to the lower ice storage unit 1a. Further, the ice storage unit 1a detects the amount of ice, and when the ice storage unit 1 is full, the discharge of ice to the ice storage unit 1a is stopped, so that the ice does not overflow from the ice storage unit 1a.

[Detailed configuration of drive unit]
FIG. 7 is an explanatory view of an inner case used for the drive unit and members disposed in the inner case in the ice making device shown in FIG. 1.

  As shown in FIG. 3A, the drive unit 3 includes a case body 4, and the main switch including the motor 5 and the leaf switch described with reference to FIG. 72, a water supply switch 73 (water supply control unit) including a leaf switch, an ice detecting switch 71 including a leaf switch, and the like are disposed. In this embodiment, the case body 4 includes a rectangular bowl-shaped inner case 41, a ground plane 42 (first partition wall), and a rectangular bowl-shaped outer case 43, and the inner case 41 and the inner case 41 so as to sandwich the ground plane 42 from the left and right sides. The case body 4 is formed by overlapping the edges with the outer case 43. In this state, a first space 46 is defined between the inner case 41 and the ground plane 42, while a second space 47 is defined between the outer case 43 and the ground plane 42. The first space 46 and the second space 47 are each used to arrange the following mechanisms and the like.

  As shown in FIG. 7, a thermostat 91 is fixed to the bottom of the inner case 41 in the first space 46 between the inner case 41 and the ground plane 42. Further, in the ice making device 1 of this embodiment, as shown in FIG. 2B, in the ice making tray 21, the rubber terminal portion 262 (coupling engaging portion) of the heater 26 projects toward the drive unit 3. On the other hand, as shown in FIG. 7, in the case body 4 of the drive unit 3, the concave portion 411 that opens toward the outer surface side of the inner case 41 is located at both sides of the thermostat 91 at the bottom of the inner case 41. (Engaged portion for connection) is formed, and a through hole 412 is formed in the back of the recess 411. In addition, a connection terminal 92 is disposed at the bottom of the inner case 41 so as to be exposed in the through hole 412. Therefore, after assembling the drive unit 3 and the ice making unit 2, when the terminal portion 262 protruding from the ice tray 21 is fitted into the recess 411 of the inner case 41, the ice making unit 2 and the drive unit 3 are connected. At the same time, the terminal 261 of the heater 26 is electrically connected to the connection terminal 92 at the fitting portion between the terminal portion 262 and the recess 411. Further, on the outer surface side of the bottom portion of the inner case 41, a ground member 45 is disposed at a position where it can contact the ice tray 21. In the inner case 41, the location where the ground member 45 is disposed and the ice tray 21. Is fixed with a metal grounding screw or the like, the ice tray 21 can be grounded. In this state, the thermostat 91 abuts on the test temperature portion 219 of the ice tray 21, so that the temperature of the ice tray 21 can be monitored. Further, when the drive unit 3 and the ice making unit 2 are fastened, the D-cut portion 230 of the rotating shaft 231 is inserted into a connecting hole 55u having a D-shaped cross section of the rotating cam body 55 described later with reference to FIG. Fits automatically.

(Driving mechanism for rotating shaft 231 in deicing mechanism 1f)
8A, 8B, and 8C are side sectional views of the rotating cam body shown in FIG. 7 in the ice making device shown in FIG. 1, and perspective views of a state where leaf contact pieces are arranged on the rotating cam body, respectively. FIG. 3 is an exploded perspective view of a rotating cam body.

  As shown in FIG. 3A, in the first space 46 formed between the inner case 41 and the ground plane 42, a rotating cam body 55 is disposed at the bottom of the inner case 41. The upper end side protrudes into a second space 47 formed between the base plate 42 and the outer case 43 through a through hole 421 formed in the base plate 42.

  Further, in the first space 46 formed between the inner case 41 and the base plate 42, as shown in FIG. 7, the motor 5 is disposed at the side of the rotating cam body 55 at the bottom of the inner case 41. Yes. Here, the motor 5 is, for example, an AC synchronous motor. Further, a transmission mechanism 50 for transmitting the rotation of the motor 5 to the rotation shaft 231 of the ice making unit 2 is formed in the first space 46. The transmission mechanism 50 includes a rotor pinion 51 rotatably supported on a fixed shaft of the motor 5, a torque limiter 8 including a large-diameter external gear 502 (input unit) that meshes with the rotor pinion 51, torque, A toothless gear 503 constituting an output portion of the limiter 8, a gear body 52 including a large-diameter external gear 504 driven by the toothless gear 503, and a small-diameter external gear (not shown) of the gear body 52. And a rotating cam body 55 having a large-diameter external gear 54 that meshes with a small-diameter external gear of the gear body 53. Yes.

  The front end portion of the output shaft of the motor 5 is supported by the ground plate 42, and the support shaft that rotatably supports the torque limiter 8, the gear body 52, and the gear body 53 is supported by the end plate 5 a and the ground plate 42. ing. The rotating cam body 55 is rotatably supported by the bottom portion of the inner case 41 and the main plate 42.

  As shown in FIG. 8A, the rotating cam body 55 includes a cylindrical portion 55 s that extends downward from the external gear 54. The cylindrical portion 55s is formed with a connecting hole 55u having a D-shaped cross section at the inlet, and the D-cut portion 230 of the rotary shaft 231 is fitted into the connecting hole 55u, whereby the rotating cam body 55 rotates. Is transmitted to the rotating shaft 231.

(Configuration of ice detection mechanism)
FIG. 9 is an explanatory diagram of a base plate used in the drive unit and members disposed on the side facing the outer case in the base plate in the ice making device shown in FIG. 1.

  In this embodiment, the first space 46 between the inner case 41 and the main plate 42 and the second space 47 between the main plate 42 and the outer case 43 shown in FIG. An ice detecting mechanism 6 that detects the amount of ice in the ice storage unit 1a via the ice detecting lever 60 is configured.

  In the present embodiment, the ice detecting mechanism 6 is generally shown in FIG. 7, as shown in FIG. 7, with a lever driving mechanism 65 configured using a first space 46 between the inner case 41 and the main plate 42, and FIG. As described above, the lever position detection mechanism 75 configured by using the second space 47 between the ground plane 42 and the outer case 43 and the second space 47 between the ground plane 42 and the outer case 43 are configured. The ice detection switch 71 is turned on and off by the lever position detection mechanism 75.

  First, as shown in FIGS. 7 and 8A, the lever driving mechanism 65 includes a cam portion 55t formed around a cylindrical portion 55s formed on the lower end side of the rotating cam body 55, and a cam portion 55t. A first drive lever 61 that follows the cam surface to drive the ice detection lever 60, a torsion coil spring 66 that biases the first drive lever 61, and a second drive lever 62 that holds the end of the ice detection lever 60. And.

  The first drive lever 61 includes a claw portion 611 that contacts the cam portion 55t, a cylindrical support shaft 612 that extends in the axial direction, and a transmission portion 614 that is located on the opposite side of the support shaft 612 from the claw portion 611. A U-shaped notch 613 is formed in the transmission portion 614. Therefore, when the rotating cam body 55 is rotated by the rotation of the motor 5 and the cam portion 55t is rotated, the claw portion 611 is pushed by the cam portion 55t, and the first drive lever 61 resists the biasing force of the torsion coil spring 66. Then, it rotates by a predetermined angle range around the support shaft 612 in the direction indicated by the arrow C1 in FIG. Further, when the small diameter portion of the cam surface comes into contact with the claw portion 611, the first drive lever 61 rotates backward in the direction indicated by the arrow C2 around the support shaft 612 by the biasing force of the torsion coil spring 66, Return to position.

  The second drive lever 62 has a cylindrical portion 621 connected to the end of the ice detecting lever 60 via the rotation output member 69 shown in FIGS. 1A and 1B, and a transmission projecting from the side surface of the cylindrical portion 621. And a small protrusion 622 protruding from the side surface of the cylindrical portion 621 on the opposite side of the transmission protrusion 623, and a pin 623 a protruding from the lower surface of the transmission protrusion 623 is formed on the first drive lever 61. It fits into the U-shaped notch 613 made. Therefore, when the first drive lever 61 rotates in the direction indicated by the arrow C1, the second drive lever 62 rotates in the direction indicated by the arrow D1 around the cylindrical portion 621, while the first drive lever 61 rotates by the arrow C2. When rotating in the direction shown, the second drive lever 62 rotates in the direction indicated by the arrow D2 around the cylindrical portion 621. Therefore, the ice detecting lever 60 can be driven. The base plate 42 is formed with a stopper 629a that prevents the protrusion 623 of the second drive lever 62 from rotating in the direction indicated by the arrow D2 by a predetermined amount or more and a stopper 629b that prevents the protrusion 623 from rotating in the direction D1. Yes.

  A leaf spring 63 is arranged at a side position of the cylindrical portion 621. When the ice detecting lever 60 is lifted up manually, the small protrusion 622 of the second drive lever 62 gets over the protrusion 63a of the leaf spring 63. The ice detecting lever 60 is maintained in the raised state. As a result, the ice making device 1 is in a state similar to the full ice state, so that the operation of the ice making device 1 is stopped.

  As shown in FIG. 9, the second drive lever 62 has the upper half of the cylindrical portion 621 passing through the base plate 42 and positioned in the second space 47 between the base plate 42 and the outer case 43, and the lever position The detection mechanism 75 includes a protrusion 625 formed on the outer peripheral surface of the upper end portion of the cylindrical portion 621 in the second drive lever 62, a driven ring 751 mounted around the upper end portion of the cylindrical portion 621 on the base plate 42, and a driven A pressing lever 753 whose posture is switched by a protrusion 752 protruding from the outer peripheral surface of the ring 751 is provided. The pressing lever 753 includes a cylindrical portion 753a that fits into a protrusion formed on the base plate 42, a connecting portion 753b that extends from the cylindrical portion 753a, and a first protruding portion that protrudes from the distal end portion of the connecting portion 753b toward the driven ring 751. 753c and a second protrusion 753d that protrudes from the tip of the connecting portion 753b to the opposite side of the first protrusion 753c.

  In the lever position detection mechanism 75, a notch 755 (concave portion) extending in the circumferential direction is formed on the back surface side of the protrusion 752 of the driven ring 751 and on the inner peripheral side of the hole through which the cylindrical portion 621 passes. The protrusion 625 formed on the cylindrical portion 621 of the second drive lever 62 is positioned inside the notch 755 with a certain amount of play with respect to the circumferential ends 755a and 755b of the notch 755. For this reason, between the second drive lever 62 and the driven ring 751, a transmission portion for transmitting the movement of the second drive lever 62 to the driven ring 751 is formed at a position spaced in the circumferential direction by a predetermined dimension. .

  In the lever position detection mechanism 75 configured as described above, when the second drive lever 62 rotates in the direction of the arrow D1 (when the ice detecting lever 60 is raised), the movement of the protrusion 625 is the circumference of the notch 755. This is transmitted by coming into contact with the end portion 755b located on the side indicated by the direction arrow D1, and the driven ring 751 rotates in the direction indicated by the arrow D1 in conjunction with the second drive lever 62. Accordingly, the first protrusion 753c of the pressing lever 753 is configured so that the outer surface of the driven ring 751 is in contact with the peripheral surface where the protrusion 752 is not formed (the lower part of the driven member). Transition to the state of abutting the inclined surface 752d, and the state just before contacting the outer peripheral surface of the protrusion 752 (the high part of the driven member), the pressing lever 753 is centered on the cylindrical portion 753a by the arrow E1. The second protrusion 753d causes the ice detection switch 71 to perform an on / off operation.

  In the present embodiment, the ice detection switch 71 is a leaf switch, and includes three leaf contact pieces 711, 712, and 713. Of the three leaf contact pieces 711, 712, 713, the two leaf contact pieces 712, 713 are in a fixed state, while the leaf contact piece 711 comes into contact with the pressing lever 753 and is displaced. ing. More specifically, the leaf contact piece 711 is different from the leaf contact piece 712 with respect to the leaf contact piece 711 in the leaf contact piece 713 when the second protrusion 753d of the pressing lever 753 is in a non-contact state. The leaf contact piece 711 and the leaf contact piece 713 are in contact with each other. The leaf contact piece 711 and the leaf contact piece 713 are in contact with each other. On the other hand, when the leaf contact piece 711 is pressed by the second protrusion 753d of the pressing lever 753, the leaf contact piece 711 is deformed to the leaf contact piece 712 side and is separated from the end 713a of the leaf contact piece 713. It will be in contact with the piece 712.

  In the ice detecting mechanism 6 configured as described above, the leaf contact piece 711 is in contact with the end portion 713a of the leaf contact piece 713 until the motor 5 starts rotating. When detecting the amount of ice in the ice storage unit 1a, the rotating cam body 55 is rotated by the motor 5, and when the first drive lever 61 rotates in the direction indicated by the arrow C1 by the rotation, the second drive lever 62 is It rotates in the direction indicated by the arrow D1 around the cylindrical portion 621. As a result, the ice detecting lever 60 rotates as shown by an arrow F1 in FIGS. 3A and 3B, and the tip thereof rises. At this time, the second drive lever 62 rotates in the direction indicated by the arrow D1, and the driven ring 751 also rotates in the direction indicated by the arrow D1, so that the protrusion 752 of the driven ring 751 is the first protrusion of the pressing lever 753. It will be in the state which sunk under 753c. Therefore, as a result of the pressing lever 753 rotating in the direction indicated by the arrow E1, the leaf contact piece 711 comes into contact with the leaf contact piece 712. Further, in a state where the pressing lever 753 rides on the protrusion 752 of the driven ring 751, the leaf contact piece 711 and the leaf contact piece 712 are in a stable contact state.

  Further, when the rotary cam body 55 is rotated by the rotation of the motor 5, the first drive lever 61 rotates in the reverse direction in the direction indicated by the arrow C2, and the second drive lever 62 is rotated in the direction indicated by the arrow D2 around the cylindrical portion 621. Try to rotate. As a result, the ice detecting lever 60 rotates as shown by an arrow F2 in FIGS. 3A and 3B, and the tip end portion of the ice detecting lever 60 tends to descend.

  At this time, if ice is insufficient in the ice storage section 1a, the ice detecting lever 60 is allowed to descend, so that the second drive lever 62 rotates in the direction indicated by the arrow D2, and the protrusion 625 is formed in the notch 755. The end portion 755a is pressed, and the driven ring 751 can rotate in the direction indicated by the arrow D2. Therefore, at the timing when the first protrusion 753c of the pressing lever 753 contacts the inclined surface 752a of the protrusion 752 of the driven ring 751, it is set as a boundary between whether the ice storage part 1a is in an insufficient ice state or a full ice state. Then, the ice amount of the ice storage unit 1a can be detected by the on / off operation of the ice detecting switch 71.

  Here, since the driven ring 751 is driven with play with respect to the second drive lever 62, even if the second drive lever 62 rotates in the direction indicated by the arrow D1 and then reverses in the direction indicated by the arrow D2, 625 simply moves within the notch 755 and the driven ring 751 does not follow. Instead, the leaf contact piece 711 applies an urging force to return from the elastically deformed state to the pressing lever 753. Therefore, when the second drive lever 62 rotates in the direction indicated by the arrow D2, the pressing lever 753 Presses the slope 752a formed on the protrusion 752 of the driven ring 751 to displace the driven ring 751 in the direction indicated by the arrow D2. Therefore, the driven ring 751 is displaced before the driven ring 751 is driven by the second drive lever 62. Therefore, even before the driven ring 751 is driven by the second drive lever 62, the leaf contact piece 711 can instantaneously return from the elastically deformed state. The contact piece 711 returns to the state in contact with the end portion 713a of the leaf contact piece 713. Therefore, even when the operation is transmitted to the ice detecting switch 71 via the cam mechanism, the ice detecting switch 71 does not clearly indicate the state in which the leaf contact pieces 711, 712, and 713 are in contact with each other or the state in which they are separated from each other. Since an unstable region does not occur, no electrical failure occurs.

  When the ice storage unit 1a is full of ice, the ice detecting lever 60 is prevented from descending by the ice, so that the second drive lever 62 is prevented from rotating in the direction indicated by the arrow D2, and the leaf contact piece 711 is prevented. Remains in contact with the leaf contact piece 712. Since the first drive lever 61 is prevented from rotating in the direction of the arrow C2 after the descending of the ice detecting lever 60 is blocked by the ice, the claw portion 611 of the first drive lever 61 has the rotating cam body 55. The cam portion 55t is not driven in the C2 direction, and the ice detecting lever 60 does not descend from the position restricted by the ice even if the rotating cam body 55 rotates.

(Configuration of main switch 72)
FIG. 10 is an explanatory diagram of three leaf contact pieces constituting a main switch in the ice making device shown in FIG. In the present embodiment, the main switch 72 is configured by using the second space 47 between the ground plane 42 and the outer case 43 shown in FIG. 3A, and in configuring the main switch 72, the first space The upper half of the rotating cam body 55 protruding from the 46 through the through hole 421 of the base plate 42 to the second space 47 is used.

  As shown in FIGS. 8A and 8B, the rotating cam body 55 has a large-diameter portion 553 and an arc-shaped plate-like portion 554 having a smaller diameter than the large-diameter portion 553. A first cam portion 558 having a smaller diameter than the arc-shaped plate-shaped portion 554, a second cam portion 559 having a smaller diameter than the first cam portion 558, and a small diameter portion 555 having a smaller diameter than the second cam portion 559 are formed in this order. It has a multi-stage shape, and these step portions are located on the second space 47 side. The side surfaces of the first cam portion 558 and the second cam portion 559 are both cam surfaces having step portions 558b and 559b whose diameters change rapidly in the circumferential direction. In this cam surface, the step portions 558b and 559b are provided. The diameter increases in the direction indicated by arrow B starting from. Further, in the first cam portion 558 and the second cam portion 559, the positions of the step portions 558b and 559b are shifted in the circumferential direction, and the step portion 559b is positioned behind the step portion 558b in the direction indicated by the arrow B. is doing. The arcuate plate-like portion 554 is formed with a convex cam portion 556 for operating a leaf contact piece of a water supply switch 73 described later.

  Further, in the main plate 42, as shown in FIGS. 8B, 9 and 10, the three leaf contact pieces 721, 722 constituting the main switch 72 (leaf switch) toward the rotating cam body 55 are provided. 723 extends. In the three leaf contact pieces 721, 722, and 723, the leaf contact piece 723 is disposed at a position closest to the central axis of the rotating cam body 55, the leaf contact piece 722 is disposed on the outer side, and the leaf contact piece on the outer side. A piece 721 is arranged. The tip end portion 723 c of the leaf contact piece 723 is in elastic contact with the side surface of the second cam portion 559. Further, in the initial state, the tip end portion 722c of the leaf contact piece 722 is in a state of being lowered to the lower side of the stepped portion 559b, and is in contact with the leaf contact piece 723 with elasticity. On the other hand, the tip 721c of the leaf contact piece 721 is in contact with the side surface of the first cam portion 558 with elasticity.

  Here, the three leaf contact pieces 721, 722, and 723 are arranged in parallel with the fixed end and the free end facing each other in the same direction, and the rotating cam body 55 includes the three leaf contact pieces 721, 722. , 723, the leaf contact pieces 721, 722, 723 rotate from the side where the fixed end side is located toward the side where the free end is located. For this reason, after all the three leaf contact pieces 721, 722, and 723 are pressed radially outward by the convex portion of the rotating cam body 55, the original shape is instantaneously restored when the convex portion passes.

  In this embodiment, the leaf contact piece 723 extends linearly from the proximal end side, then bends at a right angle upward, and then extends horizontally again, and the lower end edge of the distal end portion 723c is the first cam. The upper surface of the portion 558 can slide. On the other hand, after the leaf contact pieces 721 and 722 linearly extend at the same height position as the proximal end side of the leaf contact piece 723, the distal end portions 721c and 722c have a width upward. It has an enlarged shape, and the upper end edges of the front end portions 721c and 722c are at the same height as the upper end edge of the front end portion 723c of the leaf contact piece 723. Further, when the leaf contact pieces 721 and 722 are compared, the tip edge of the leaf contact piece 721 protrudes slightly toward the tip side than the tip edge of the leaf contact piece 722. When the rotating cam body 55 rotates in the direction indicated by the arrow B, the tip end portions 721c and 722c move along the side surface of the first cam portion 558 and the tip end portions The lower end edges of 721c and 722c slide on the upper surface of the arcuate plate-like portion 554.

  In the main switch 72 configured as described above, in the initial state, the leaf contact piece 723 is located on the higher side of the step portion 558b, while the leaf contact piece 722 is located on the lower side of the step portion 559b. Therefore, it is in contact with the leaf contact piece 723. From this state, when the rotating cam body 55 rotates in the direction indicated by the arrow B, the tip end portion 723c of the leaf contact piece 723 falls to the lower side of the stepped portion 558b, and the leaf contact piece 722 and the leaf contact piece 723 are separated. Further, immediately before the tip 723c of the leaf contact piece 723 falls to the lower side of the stepped portion 558b, the tip end portion 721c of the leaf contact piece 721 falls to the lower side of the stepped portion 559b, so that the leaf contact piece 721 becomes the leaf contact piece 722. Connected to. Then, when the rotating cam body 55 further rotates in the direction indicated by the arrow B, the leaf contact pieces 721, 722, 723 return to the initial state after the state where the leaf contact pieces 721, 722, 723 are positioned higher on the stepped portions 559b, 558b.

(Water supply switch 73 (configuration of water supply control unit))
FIG. 11 is an explanatory diagram of the water supply switch 73 configured in the ice making device shown in FIG. In FIG. 11, among the driving cam member 55a and the driven cam member 55b that constitute the rotating cam body 55, the driven cam member 55b is grayed, and the cam on the upper end side of the driving cam member 55a. The illustration of the part is omitted.

  In this embodiment, the water supply switch 73 (water supply control unit) shown in FIG. 9 is configured by using the second space 47 between the main plate 42 and the outer case 43 shown in FIG. When configuring the switch 73, similarly to the main switch 72, the upper half of the rotating cam body 55 protruding from the first space 46 to the second space 47 through the through hole 421 of the base plate 42 is used.

  First, a convex cam portion 556 is formed on the side surface of the arcuate plate-like portion 554, while two leaf contact pieces 731 and 732 are directed toward the arc-like plate-like portion 554 of the rotating cam body 55. The cam contact portion 731g bent in a triangular shape in the leaf contact piece 731 (switching movable member) is in contact with the side surface (cam surface) of the arc-shaped plate-like portion 554.

  In the water supply switch 73 configured as described above, in the initial state, the leaf contact piece 731 is separated from the leaf contact piece 732 and is in an off state. From this state, when the rotating cam body 55 rotates in the direction indicated by the arrow B and the leaf contact piece 731 is pressed toward the leaf contact piece 732 by the convex cam portion 556, the leaf contact piece 731 and the leaf contact piece When the rotary cam body 55 further rotates in the direction indicated by the arrow B and the leaf contact piece 731 returns to the original position, the leaf contact piece 731 is removed from the leaf contact piece 732. Leave and return to the off state.

  In such a water supply switch 73 as well as the main switch 72, the leaf contact piece 731 is arranged so that the rotating cam body 55 rotates from the side where the fixed end side of the leaf contact piece 731 is located toward the side where the free end is located. Then, after being pushed radially outward by the convex cam portion 556, when the convex cam portion 556 passes, the original shape is instantaneously restored. However, in this embodiment, since the main switch 72 is formed on the common rotating cam body 55, if the five leaf contact pieces 721, 722, 723, 731 and 732 are arranged in parallel in a narrow space, the rotation is performed. The leaf contact piece 731 must be arranged so that the cam body 55 rotates from the side where the free end of the leaf contact piece 731 is located toward the side where the fixed end is located. Therefore, the following configuration is adopted to improve the responsiveness at the water supply switch 73.

(Detailed configuration of the rotating cam body 55)
First, in this embodiment, as shown in FIGS. 8B, 8C, and 11, the rotary cam body 55 includes a drive cam member 55a that forms the main body of the rotary cam body 55, and a drive cam member. It is comprised from the ring-shaped driven cam member 55b (water supply control cam member) supported by 55a.

  The drive cam member 55a includes a disk portion 551 having an external gear 54 on the outer peripheral surface, and a cam drive shaft 552 protruding from the disk portion 551. In the upper half of the cam drive shaft 552, The 1 cam part 558, the 2nd cam part 559, and the small diameter part 555 are formed in this order. The driving cam member 55a is also integrally formed with a cylindrical portion 55s and a cam portion 55t to which the rotary shaft 231 is coupled.

  The ring-shaped driven cam member 55 b includes a large diameter portion 553 and an arcuate plate-like portion 554 formed on the upper surface of the large-diameter portion 553, and an outer peripheral surface of the arc-like plate-like portion 554 is provided. A convex cam portion 556 is formed. On the lower side of the large diameter portion 553, a disk portion 557 having a diameter larger than that of the large diameter portion 553 is formed. The disk portion 557 is fitted into an annular recess 551e formed on the upper surface of the disk portion 551. Thus, the driving cam member 55 a and the driven cam member 55 b constitute a rotating cam body 55.

  Here, a projection 551f is formed on the inner side of the annular recess 551e from the peripheral wall, while a recess 557f into which the projection 551f is fitted is formed on the outer peripheral surface of the disk portion 557. For this reason, the driven cam member 55b rotates following the drive cam member 55a on the driven cam member 55b, but the circumferential dimension of the recess 557f is wider than the circumferential dimension of the protrusion 551f. Between the driving cam member 55a and the driven cam member 55b, a circumferential play corresponding to the difference between the circumferential dimension of the recess 557f and the circumferential dimension of the protrusion 551f is secured.

  In this embodiment, the convex cam portion 556 has a steeper surface 556b located on the opposite side of the rotational direction than the inclined surface 556a located on the rotational direction side of the rotating cam body 55.

  In the rotating cam body 55 configured in this manner, at least during the period in which the convex cam portion 556 and the cam contact portion 731g of the leaf contact piece 731 are close to each other, the driven cam member 55b is connected to the drive cam member 55a. It must be supported concentrically.

  Therefore, in this embodiment, the arcuate sliding recess 554a formed by the inner peripheral surface of the arcuate plate-like portion 554 of the driven cam member 55b and the arcuate slide formed by the outer peripheral surface of the cam drive shaft 552 of the drive cam member 55a. The arcuate sliding portion 550 is configured by the arcuate sliding concave portion 554a and the arcuate sliding convex portion 552a, with the moving convex portion 552a having the same radius of curvature. The inner peripheral surface of the large-diameter portion 553 is also located on the outer peripheral side of the cam drive shaft 552. However, the inner diameter dimension (curvature radius) of the large-diameter portion 553 is larger than that of the cam drive shaft 552, so Is not in contact with the outer peripheral surface of the cam drive shaft 552. That is, the portion of the inner peripheral surface of the ring-shaped driven cam member 55b that is displaced in the circumferential direction with respect to the arc-shaped sliding recess 554a is a large-diameter portion that has a larger radius of curvature than the arc-shaped sliding recess 554a. And a sufficient clearance is provided between the cam drive shaft 552 and the outer peripheral surface (the arcuate sliding protrusion 552a).

  Further, in this embodiment, the arc angle Θ of the arc-shaped plate-like portion 554 (arc-shaped sliding recess 554a) is 180 ° or less, and in this embodiment, it is set to approximately 160 °.

(Operation and effect of water supply switch 73)
In the water supply switch 73 configured as described above, as shown in FIG. 11A, the cam contact portion 731g of the leaf contact piece 731 rides on the convex cam portion 556 and the leaf contact pieces 731 and 732 are electrically connected. During this period, the water supply switch 73 is in the relay state, and the commercial power supply V is supplied to the water supply pump 220 that is electrically connected in series to the water supply switch 73.

  When the driven cam member 55b rotates together with the cam drive shaft 552 (drive cam member 55a) in the direction indicated by the arrow B and the cam contact portion 731g gets over the convex cam portion 556, the driven cam member 55b. 11B, the surface 556b is kicked by the urging force of the leaf contact piece 731 and rotates ahead of the cam drive shaft 552. As shown in FIG. Therefore, even when the driven cam member 55b rotates from the side where the free end of the leaf contact piece 731 is located toward the side where the fixed end is located, the leaf contact piece 731 is pressed by the convex cam portion 556. It returns instantly from its deformed state to its original shape. Therefore, even when the position accuracy and dimensional accuracy of the leaf contact piece 732 contacting and leaving the leaf contact piece 731 are low, the timing accuracy at which the water supply switch 73 is switched is high. For this reason, even when the water supply switch 73 and the electric motor of the water supply pump 220 are electrically connected in series, no spark is generated, and contact deterioration can be prevented. In addition, when a spark is generated in the water supply switch 73, noise enters the commercial power supply. However, in this embodiment, since the connection state is instantaneously switched from the connected state to the disconnected state, no spark is generated. It is possible to prevent noise from entering.

  Even when another leaf switch (main switch 72) different from the water supply switch 73 is configured by the driving cam member 55b and the driving cam member 55a interlocked with the cam driving shaft 552, the main switch 72 is rotated. The cam body 55 can be configured to rotate from the side where the fixed ends of the leaf contact pieces 721, 722, 723 are located toward the side where the free ends are located. Therefore, high responsiveness can be realized in both the water supply switch 73 and the main switch 72.

  Further, in this embodiment, the arcuate sliding surface 550 is formed on the driving cam member 55a with the arcuate sliding recess 554a formed in the driven cam member 55b and the same radius of curvature as the arcuate sliding recess 554a. The driven cam member 55b smoothly rotates in advance with respect to the driving cam member 55a by the pressing force of the ice detecting switch 71 because it is constituted by the formed arcuate sliding convex portion 552a. That is, when the arcuate sliding recess 554a and the arcuate sliding projection 552a are formed in a perfect circle around the entire circumference, if the clearance between them is large, the driven cam member 55b is moved to the drive cam member 55a. On the other hand, if the clearance is small, the driven cam member 55b cannot smoothly rotate in advance with respect to the drive cam member 55a. However, according to this embodiment, the arcuate sliding surface 550 has the arcuate sliding recess 554a formed in the driven cam member 55b and the driving cam member 55a having the same radius of curvature as the arcuate sliding recess 554a. Therefore, the problem caused by the clearance between the driving cam member 55a and the driven cam member 55b does not occur.

  Of the arcuate sliding recess 554a and the arcuate sliding protrusion 552a, the arcuate angle Θ of the arcuate sliding recess 554a is 180 ° or less. For this reason, the sliding resistance between the driven cam member 55b and the driving cam member 55a is small. Therefore, the driven cam member 55b smoothly rotates in advance with respect to the driving cam member 55a by the pressing force of the ice detection switch 71, so that the ice detection switch 71 can perform a stable switching operation.

(Leaf contact piece arrangement structure)
In this embodiment, when configuring the ice detecting switch 71, the main switch 72, and the water supply switch 73, strip-shaped leaf contact pieces 711, 712, 713, 721, 722, 723, 731, 732 formed by processing a metal plate into a predetermined shape. However, the base end side of these leaf contact pieces is a strip shape whose sides facing each other in the width direction are parallel like the leaf contact pieces 721, 722, 723 shown in FIG. In addition, any leaf contact piece has the same width dimension on the base end side. Therefore, in this embodiment, the leaf contact pieces 711, 712, 713, 721, 722, 723, 731, and 732 use the flat V-shaped contact piece holding part 48 formed in a base shape on the base plate 42. The structure to hold it is adopted. More specifically, a plurality of holding grooves 48 a are formed in the contact piece holding portion 48 with the same depth and the same shape, and the leaf contact pieces 711, 712, 713, 721, 722, 723, 731, 732 are formed. Both proximal ends are fitted and fixed in the holding grooves 48a. In this embodiment, since the holding grooves 48a have the same depth, the leaf contact pieces 711, 712, 713, 721, 722, 723, 731 and 732 all have the same height on the main plate 42. Held in position.

  Here, the front end portions 721c and 722c of the leaf contact pieces 721 and 722 and the front end portion 723c of the leaf contact piece 723 are different from each other in the height position from the base plate 42 in the rotating cam body 55 and the second cam. In this embodiment, as described with reference to FIG. 10, the leaf contact piece 723 extends linearly from the base end side and then bends at a right angle upward. After that, the leaf contact pieces 721 and 722 extend horizontally again, and the proximal end sides of the leaf contact pieces 721 and 722 extend linearly at the same height position as the proximal end side of the leaf contact piece 723, and then the distal end portions 721c and 722c It has a shape whose width is increased upward. For this reason, even when the proximal ends of the leaf contact pieces 721, 722, 723 are held at the same height position on the main plate 42, the distal ends 721c, 722c, 723c of the leaf contact pieces 721, 722, 723 are rotated. The cam body 55 can be suitably brought into contact with the side surfaces of the first cam portion 558 and the second cam portion 559 having different height positions from the base plate 42.

  Further, in this embodiment, the circuit board 70 disposed so as to face the ground plane 42 is overlaid on the base end side of the leaf contact pieces 711, 712, 713, 721, 722, 723, 731, and 732. Yes. Here, the circuit board 70 includes terminal portions 711e, 712e, 713e, 721e, 722e, 723e, 731e, 732e that stand on the base end side of the leaf contact pieces 711, 712, 713, 721, 722, 723, 731, 732. PWB (Printed Wiring Board) having lands to be soldered and having high rigidity. Further, the base plate 42 is covered with an outer case 43. On the inner bottom surface of the outer case 43, ribs (not shown) that match the outer shape of the contact piece holding portion 48 are formed. Therefore, in the state where the inner case 41, the base plate 42, and the outer case 43 are overlapped to form the case body 4, the base end side of the leaf contact pieces 711, 712, 713, 721, 722, 723, 731 and 732 is the circuit board. 70 is pressed in the width direction and pressed toward the main plate 42.

(Configuration of water supply adjustment mechanism)
As shown in FIG. 9, in the ice making device of the present embodiment, the on / off timing at the water supply switch 73 using the space between the outer case 43 and the main plate 42 (see FIG. 1) inside the case body 4. A water supply amount adjusting mechanism 79 is configured to adjust the amount of water. The water supply amount adjusting mechanism 79 according to the present embodiment includes an operation member 76 (operation member) rotatably supported by a support shaft (not shown) that stands up from the main plate 42, and a rack that meshes with an external tooth portion of the operation member 76. And a lever-shaped transmission member 77 having a toothed portion 770, and the transmission member 77 transmits an external operation to the operation member 76 to the leaf contact piece 732.

  The water supply switch 73, the operation member 76, and the transmission member 77 are all arranged in the case body 4, but the outer case 43 has a circular hole (not shown) at a position overlapping the head of the operation member 76. Is formed. Therefore, when the operation member 76 is rotated with a flat-blade screwdriver (not shown) or the like, the transmission member 77 rotates around the cylindrical portion 771 as indicated by arrows G1 and G2, and the position of the claw portion 772 changes. To do. At that time, when the transmission member 77 is rotated in the direction indicated by the arrow G1, the tip side of the leaf contact piece 732 is bent in a direction away from the leaf contact piece 731. Therefore, the timing at which the water supply switch 73 is switched from OFF to ON is delayed. The timing to switch from to off is accelerated. Therefore, since the water supply time from the water supply part 22 demonstrated with reference to FIG. 1 to the ice tray 21 becomes short, the amount of water supply to the ice tray 21 reduces, and small ice can be manufactured by that much. On the other hand, when the transmission member 77 rotates in the direction indicated by the arrow G2, the leading end side of the leaf contact piece 732 bends in a direction approaching the leaf contact piece 731. Therefore, the timing at which the water supply switch 73 is switched from OFF to ON is advanced. On the other hand, since the timing of switching from on to off is delayed, the amount of water supplied from the water supply unit 22 to the ice tray 21 can be increased, so that the amount of water supplied to the ice tray 21 can be increased and large ice can be produced. it can.

(Operation of drive unit)
The operation of the drive unit will be briefly described with reference to FIG. 12 in connection with the overall operation described with reference to FIGS. FIG. 12 is an explanatory diagram showing the operation of the drive unit of the ice making device shown in FIG.

  First, in the initial state, the positions of the rotary cam body 55, the first drive lever 61, the second drive lever 62, the pressing lever 753, the leaf contact piece 723, and the leaf contact piece 731 are as shown in FIG. . In this state, the position of the ice detecting lever 60 is at the lowest position. Further, the scraping portion 232 in the scraping member 23 is a position that forms an angle of about 20 ° with respect to the horizontal direction.

  From this state, when the thermostat 91 is turned on at time T0 shown in FIG. 6, the energization of the motor 5 and the energization of the heater 26 are started, and the rotating cam body 55 rotates. Start rotation in direction A.

  Then, at time T1 shown in FIG. 6, as shown in FIG. 12B, the leaf contact piece 721 falls from the step 558b immediately after the scraped portion 232 forms an angle of about 10 ° with respect to the horizontal direction. The main switch 72 is switched from the first state to the second state.

  Next, at time T2 shown in FIG. 6, the rotation of the rotary cam body 55 is transmitted to the ice detecting lever 60 via the first drive lever 61 and the second drive lever 62, and is indicated by an arrow F1 in FIG. Thus, the ice detecting lever 60 is raised.

  Next, at time T3 shown in FIG. 6, the rotation of the rotating cam body 55 is transmitted to the ice detecting lever 60 via the first drive lever 61 and the second drive lever 62, and as shown in FIG. If the ice storage chamber 1a is in an ice-deficient state, the ice detecting lever 60 is lowered as indicated by an arrow F2.

  Next, at time T5 shown in FIG. 6, the rotation of the rotary cam body 55 is transmitted to the leaf contact piece 731 and water is supplied to the ice tray 21 during the sections shown in FIGS. At the same time, the rotating cam body 55, the first drive lever 61, the second drive lever 62, the pressing lever 753, the leaf contact piece 723, the leaf contact piece 731 and the like return to their original positions. That is, as shown in FIG. 11A, during the period in which the cam contact portion 731g of the leaf contact piece 731 rides on the convex cam portion 556 and the leaf contact pieces 731 and 732 are electrically connected, Since 73 is in the joint state, the commercial power supply V is supplied to the water supply pump 220 electrically connected in series to the water supply switch 73, so that water is supplied, but the cam contact portion 731 g is the convex cam portion 556. As the leaf contact pieces 731 and 732 are separated from each other and the water supply switch 73 is cut off, energization to the water supply switch 73 is stopped and water supply is stopped.

[Another form of water supply switch]
In the above embodiment, the arcuate sliding recess 554a (arcuate plate-like part 554) of the driven cam member 55b constituting the arcuate sliding part 550 and the arcuate sliding convex part 552a of the driving cam member 55a. Of the (cam drive shaft 552), the arc angle Θ of the arc-shaped sliding recess 554a (arc-shaped plate-like portion 554) was set to 180 ° or less. However, the arc-shaped sliding recess 554a (arc-shaped plate-like portion 554) of the driven cam member 55b is formed on the entire circumference, and the arc angle Θ of the outer peripheral surface of the cam drive shaft 552 of the drive cam member 55a is 180. Only the portion corresponding to less than or equal to ° (for example, 160 °) may be the arcuate sliding protrusion 552a having the same radius of curvature as the arcuate sliding recess 554a. In this case, a portion of the outer peripheral surface of the cam drive shaft 552 that is displaced in the circumferential direction with respect to the arcuate sliding protrusion 552a may be a small diameter part having a smaller radius of curvature than the arcuate sliding protrusion 552a. .

  In the above description, the driven cam member 55b has a ring shape, and the drive cam member 55a has a shaft-like portion (cam drive shaft 552). However, the drive cam member has a ring shape and is driven. The present invention may be applied to a switch mechanism in which a shaft-like portion is provided on the cam member 55b.

  In the above description, the arc angle Θ of the arc-shaped sliding concave portion 554a or the arc angle Θ of the arc-shaped sliding convex portion 552a is exemplified as around 160 ° as an example of 180 ° or less. From the viewpoint that the driven cam member 55b can be stably guided when the cam member 55b rotates in advance with respect to the driving cam member 55a, the angle may be approximately 90 ° or more.

DESCRIPTION OF SYMBOLS 1 Ice making apparatus 1f Deicing mechanism 2 Ice making unit 3 Drive unit 4 Case body 21 Ice tray 23 Scraping member 41 Inner case 42 Base plate 43 Outer case 55 Rotating cam body 55a Drive cam member 55b Drive cam member 73 Water supply switch (switch mechanism) )
550 Arc-shaped sliding portion 552 Cam drive shaft (shaft-shaped portion)
552a Arc-shaped sliding convex portion 554 Arc-shaped plate-shaped portion 554a Arc-shaped sliding concave portion 556 Convex cam portion (cam portion)
731 Leaf contact piece for water supply control (movable member for switching)

Claims (5)

A driven cam member having a cam portion, a driving cam member that engages the driven cam member with circumferential play and rotationally drives the driven cam member, and toward the driven cam member After being displaced by the cam portion, the movable movable member for switching returns to the pre-displacement state by energizing the cam portion to cause the driven cam member to rotate ahead of the driving cam member. In a switch mechanism having
Between the driven cam member and the driving cam member, an arcuate sliding recess formed in one of the driven cam member and the driving cam member, and the arcuate sliding The arcuate sliding surface is constituted by the arcuate sliding convex part formed on the other member with the same curvature radius as the concave part,
The switch mechanism according to claim 1, wherein an arc angle of at least one of the arc-shaped sliding concave portion and the arc-shaped sliding convex portion is 180 ° or less. The one member is the driven cam member;
The switch mechanism according to claim 1, wherein the other member is the driving cam member. The one member is a ring-shaped member in which the arc-shaped sliding recess is formed on an inner peripheral side surface,
3. The switch mechanism according to claim 1, wherein the other member includes a shaft-shaped portion that fits inside the ring-shaped member with the arcuate sliding convex portion on an outer peripheral side surface. 4.   On the inner peripheral side surface of the ring-shaped member, a portion shifted in the circumferential direction with respect to the arc-shaped sliding recess is a large-diameter portion having a larger curvature radius than the arc-shaped sliding recess. The switch mechanism according to claim 3.   On the outer peripheral side surface of the shaft-shaped portion, a portion shifted in the circumferential direction with respect to the arc-shaped sliding convex portion is a small-diameter portion having a smaller radius of curvature than the arc-shaped sliding convex portion. The switch mechanism according to claim 3.