JP6684662B2 - Mainspring time switch - Google Patents

Description

  The present invention relates to a mainspring time switch using a mainspring as a drive source.

  Home appliances such as a washing machine, a microwave oven, and a toaster are provided with a timer for adjusting the washing time and the cooking time. As a timer, there has been proposed a mainspring time switch in which a user winds a mainspring by turning a knob and opens and closes a contact by using the wound mainspring as a drive source.

  In such a mainspring time switch, for example, a rotary shaft to which a knob is connected and a gear arranged coaxially with the rotary shaft are provided, and the mainspring is arranged around the body of the gear. In addition, a torque limiter is provided between the rotary shaft and the gear to prevent the gear from rotating when the rotary shaft is rotated in the reverse direction after the rotary shaft is rotated, thereby preventing the mainspring from being damaged or loosened. Has been adopted. (See Patent Document 1).

JP, 2012-47275, A

  The mainspring time switch has a structure in which a cylindrical tubular member that can rotate integrally with the rotary shaft with circumferential play is arranged around the rotary shaft, and the mainspring is wound around the outer peripheral side of the cylindrical member. There is a case. In this case, a ratchet member provided with a one-way clutch engaging claw that engages with the gear and a mainspring holding portion that holds the inner end portion of the mainspring is provided between the tubular member and the gear. The ratchet member and the tubular member are integrally rotatable by fitting in a notch opened on the outer peripheral surface of the tubular member.

  However, in the above configuration, when the main shaft is wound by rotating the rotary shaft and the tubular member, the mainspring holding portion of the ratchet member is pressed radially inward by the mainspring and the mainspring holding portion is deformed inward, so that the rotary shaft It may bite. In such a state, for example, when the rotating shaft is rotated in the reverse direction after the rotating shaft is rotated, the rotation of the rotating shaft is prevented even though the torque limiter is provided between the tubular member and the gear. It is not preferable because it is transmitted to the ratchet member and the mainspring is damaged or the mainspring is loosened.

  In view of the above problems, an object of the present invention is to adopt a structure in which a tubular member is provided around a rotation shaft, and a mainspring holding portion of a ratchet member is fitted into a notch opened at an outer peripheral surface of the tubular member. Even in the case, it is an object of the present invention to provide a mainspring time switch capable of preventing contact between the mainspring holding portion and the rotary shaft.

In order to solve the above-mentioned problems, the present invention is a mainspring time switch using a mainspring as a drive source, wherein the rotary shaft is rotatable about an axis and is arranged coaxially with the rotary shaft. A gear that is coupled via a torque limiter, a cylindrical tubular member that is wound around the outer peripheral surface and is rotatable integrally with the rotary shaft with a play in the circumferential direction, and one side around the axis. An engaging pawl that engages with the gear when rotating and disengages with the gear when rotating to the other side around the axis, and a mainspring holding portion that holds the inner end of the mainspring. A ratchet member having a notch, wherein the tubular member has a notch opened at an outer peripheral surface of the tubular member and fitted with the mainspring holding portion, and the mainspring at a radially inner side of the notch. It is interposed between the holding part and the rotary shaft. A partition wall, characterized in that is provided.

  In the present invention, when the rotating shaft is rotated, the cylindrical member is rotated and the mainspring holding portion of the ratchet member is rotated, so that the mainspring can be wound up. When the rotary shaft is opened, the mainspring is released, so that the gear and the rotary shaft can be rotated by the driving force of the mainspring. Therefore, the time from the angular position set by the rotary shaft until the rotary shaft returns to the origin position is the set time. Here, the mainspring holding portion of the ratchet member that holds the inner end portion of the mainspring is fitted in the notch of the tubular member, but the tubular member does not rotate with the mainspring holding portion radially inward of the notch. A partition wall interposed between the shaft and the shaft is provided. Therefore, when the mainspring is wound up, even if the mainspring holding portion is pressed inward in the radial direction by the mainspring, the contact between the mainspring holding portion and the rotary shaft is blocked by the partition wall, so that the mainspring holding portion bites into the rotary shaft. This situation is unlikely to occur.

  In the present invention, the tubular member is connected to the first cylindrical portion fitted to the rotation shaft and one side in the axial direction of the first cylindrical portion with an inner diameter larger than that of the first cylindrical portion, and the cutout and A second cylindrical portion provided with the partition wall, the partition wall is connected to an end surface of the first cylindrical portion on the one side in the axial direction, and the tubular member is the rotary member. It is possible to adopt a mode in which the shaft portion, which projects radially outward from the shaft, can rotate integrally with the rotary shaft when it comes into contact with the partition wall in the circumferential direction. According to this aspect, since the circumferential strength of the partition wall is high, the partition wall is less likely to be damaged.

  In the present invention, it is possible to adopt a mode in which the radially inner surface of the partition wall forms a surface continuous with the inner peripheral surface of the first cylindrical portion and is in contact with the outer peripheral surface of the rotating shaft. According to this aspect, since the partition wall has high strength, the partition wall is less likely to be damaged.

  In the present invention, it is possible to adopt a mode in which the tubular member is provided with a support plate portion that projects outward in the radial direction and supports the ratchet member on the surface from the side opposite to the gear. According to this aspect, the ratchet member can be reliably supported, and thus the deformation of the ratchet member can be suppressed.

  In the present invention, it is possible to adopt a mode in which a convex portion formed on the ratchet member is fitted into the tubular member to form a concave portion for positioning the ratchet member in the circumferential direction. According to this aspect, since the ratchet member can be properly aligned with the tubular member, it is easy to fit the mainspring holding portion of the ratchet member into the notch of the tubular member when assembling the mainspring time switch. is there.

  In the present invention, when the rotating shaft is rotated, the cylindrical member is rotated and the mainspring holding portion of the ratchet member is rotated, so that the mainspring can be wound up. When the rotary shaft is opened, the mainspring is released, so that the gear and the rotary shaft can be rotated by the driving force of the mainspring. Therefore, the time until the rotary shaft reaches the angular position designated by the rotary shaft can be set as the designated time. Here, the mainspring holding portion of the ratchet member that holds the inner end portion of the mainspring is fitted in the notch of the tubular member, but the tubular member does not rotate with the mainspring holding portion radially inward of the notch. A partition wall interposed between the shaft and the shaft is provided. Therefore, when the mainspring is wound up, even if the mainspring holding portion is pressed inward in the radial direction by the mainspring, the contact between the mainspring holding portion and the rotary shaft is blocked by the partition wall, so that the mainspring holding portion bites into the rotary shaft. This situation is unlikely to occur.

It is a top view of a mainspring time switch to which the present invention is applied. It is explanatory drawing when the mainspring type time switch shown in FIG. 1 is cut | disconnected along the gearwheel used for the transmission mechanism. It is explanatory drawing which shows the structure of the rotating shaft periphery of the mainspring time switch to which this invention is applied. It is a half cross-sectional view when cutting the periphery of the rotary shaft of the mainspring time switch to which the present invention is applied along the axis. It is sectional drawing when the periphery of the rotating shaft of the mainspring type time switch to which the present invention is applied is cut in a direction orthogonal to the axis. It is explanatory drawing of the cylindrical member periphery of the mainspring time switch to which this invention is applied.

  A mainspring time switch 1 to which the present invention is applied will be described with reference to the drawings. In the following description, around the axis L of the rotary shaft 3, the winding direction of the mainspring 2 is CW, and the winding direction of the mainspring 2 is CCW. Further, in the direction of the axis L, the side on which the rotary shaft 3 projects from the cover 12 is referred to as one side L1, and the case 11 side is referred to as the other side L2.

(overall structure)
FIG. 1 is a plan view of a mainspring time switch 1 to which the present invention is applied. FIG. 2 is an explanatory diagram when the mainspring time switch 1 shown in FIG. 1 is cut along the gear used for the transmission mechanism 7. Note that, in FIG. 1, the illustration of the cover and the like is omitted.

  The mainspring type time switch 1 shown in FIGS. 1 and 2 is a timer for adjusting washing time and cooking time in home electric appliances such as a washing machine, a microwave oven, and a toaster. The mainspring type time switch 1 includes a mainspring 2 as a drive source, a rotary shaft 3 for winding the mainspring 2 and setting a time, a transmission mechanism 7 for transmitting power of the mainspring 2, and transmission of urging force of the mainspring 2. A speed adjusting mechanism 8 for adjusting the speed is provided. These members and the like are arranged inside the case 11 and the cover 12, and a knob (not shown) is connected to a portion of the rotating shaft 3 protruding from the cover 12. Indexes such as a scale for setting the time are attached to the knob and the cover 12. A first gear 71 of the transmission mechanism 7 is supported on the rotating shaft 3, and the rotating shaft 3 and the first gear 71 can rotate integrally around the axis L of the rotating shaft 3.

  In this embodiment, as will be described later with reference to FIG. 3 and the like, a tubular member 4 is arranged around the rotary shaft 3, and the tubular member 4 is rotatable integrally with the rotary shaft 3 with play in the circumferential direction. is there. Further, the mainspring 2 is wound around the tubular member 4, and a ratchet member 5 which is rotatable integrally with the tubular member 4 is arranged around the tubular member 4. Here, the ratchet member 5 has a mainspring holding portion 55 that holds the inner end portion of the mainspring 2, and the outer end portion of the mainspring 2 holds the case 11 or the like. Therefore, when the rotating shaft 3 is rotated about the axis L in the clockwise CW direction to a predetermined angular position to set the time, the tubular member 4 rotates about the axis L in the clockwise CW direction. Therefore, the mainspring holding portion 55 of the ratchet member 5 rotates about the axis L in the clockwise direction CW, so that the mainspring 2 can be wound up. Then, when the rotating shaft 3 is opened, the mainspring 2 is released, so that the rotating shaft 3 and the first gear 71 can be rotated about the axis L in the counterclockwise CCW direction by the driving force of the mainspring 2.

The transmission mechanism 7 has a first gear 71, a second gear 72, a third gear 73, and a fourth gear 74. The second gear 72, the third gear 73, and the fourth gear 74 are rotatably supported by spindles 720, 730, and 740, both ends of which are supported by the case 11 and the cover 12, respectively. The first gear 71 is a spur gear, and the second gear 72 has a small diameter gear 721 that meshes with the first gear 71 and a large diameter gear 722 having a diameter larger than that of the small diameter gear 721. The third gear 73 has a small diameter gear 731 that meshes with the large diameter gear 722 of the second gear 72, and a large diameter gear 732 having a diameter larger than that of the small diameter gear 731. The fourth gear 74 has a small diameter gear 741 which meshes with the large diameter gear 732 of the third gear 73, and a large diameter gear 742 having a diameter larger than that of the small diameter gear 741.

  The speed governing mechanism 8 has an escape wheel 81 and a pendulum 82. The escape wheel 81 and the pendulum 82 are attached to support shafts 810 and 820, both ends of which are supported by the case 11 and the cover 12, respectively. It is rotatably supported. The escape wheel & pinion 81 has a spur gear 811 meshing with the large diameter gear 742 of the fourth gear 74, and escape wheel claws 812 provided at equal intervals in the circumferential direction. The pendulum 82 has two pendulum claws 821 that engage with the escape claws of the escape wheel 81. Therefore, when the escape wheel 81 rotates, the pendulum 82 rotates in one direction, one of the two pendulum claws 821 engages with one of the escape wheel claws 812, and the escape wheel 81 moves. Apply a load in the direction to prevent the rotation of. When the escape wheel & pinion 81 further rotates to push back this load, the pendulum 82 rotates in the other direction. In this way, the pendulum claw 821 moves in and out of the escape claw 812 while the pendulum 82 swings. As a result, the escape wheel & pinion 81 rotates at a constant speed in accordance with the swing cycle of the pendulum 82, regardless of the strength of the urging force of the mainspring 2. As a result, the gears (the first gear 71, the second gear 72, the third gear 73, and the fourth gear 74) forming the transmission mechanism 7 and the rotary shaft 3 also rotate at a constant speed.

  A cam member 91 is provided on the rotating shaft 3 and the like. Therefore, when the rotating shaft 3 rotates and reaches a predetermined angular position after the set time has elapsed, the movable member 95 is driven by the cam member 91 and the contact plate 92 is driven. As a result, the two terminals 96 and 97 are switched between a short-circuited state and a separated state. Therefore, in a home electric appliance such as a washing machine, a microwave oven, and a toaster, the motor is based on the states of the two terminals 96 and 97. The power supply to the heater and the heater can be controlled.

(Structure around the rotary shaft 3)
FIG. 3 is an explanatory view showing the configuration around the rotary shaft 3 of the mainspring time switch 1 to which the present invention is applied, and is a perspective view around the rotary shaft 3 and an exploded perspective view around the rotary shaft 3. FIG. 4 is a half cross-sectional view of the periphery of the rotary shaft 3 of the mainspring time switch 1 to which the present invention is applied, taken along the axis L. FIG. 5 is a sectional view when the periphery of the rotary shaft 3 of the mainspring time switch 1 to which the present invention is applied is cut in a direction orthogonal to the axis L. 6A and 6B are explanatory views of the periphery of the tubular member 4 of the mainspring type time switch 1 to which the present invention is applied. FIGS. 6A and 6B are perspective views of the periphery of the tubular member 4 and a cylinder. It is an exploded perspective view of the periphery of the strip-shaped member 4. Note that, in FIG. 3, the first gear 71 and the cam member 91 are shown by a dashed line.

  As shown in FIG. 3 and FIG. 4, around the rotary shaft 3 of the mainspring time switch 1, a retaining ring 31, a first gear 71, and a cylindrical shape in which the mainspring 2 is wound around the outer peripheral surface. The member 4 and the plate-shaped ratchet member 5 are arranged coaxially with the rotating shaft 3. A cam member 91 is fixed around the rotary shaft 3. The tubular member 4 is in a state in which movement on the other side L2 in the axis L direction is blocked by the retaining ring 31 on the other side L2 in the axis L direction.

  As shown in FIGS. 3, 4, 5, and 6, the tubular member 4 includes a first cylindrical portion 41 fitted to the rotating shaft 3 and an inner diameter larger than that of the first cylindrical portion 41. It has the 2nd cylindrical part 42 connected to the one side L1 of the axis line L direction, and the 1st cylindrical part 41 is a bearing part and is in the state of relative rotation with respect to the rotating shaft 3.

As shown in FIG. 6, in the second cylindrical portion 42, at positions separated from the end surface 420 on the one side L1 in the axis L direction to the other side L2 in the axis L direction, the portions facing each other are directed in opposite directions. The protruding support plate portions 43 and 44 are projected, and a through hole 430 is formed in one of the support plate portions 43. On the end surface 420, groove-shaped recesses 421 and 422 are formed in an angular direction that forms an angle of about 120 ° with the support plate portion 43. On the outer peripheral surface 424 of the second cylindrical portion 42, ribs 425 extending in the direction of the axis L are provided at three positions at equal angular intervals.

  In the second cylindrical portion 42 of the tubular member 4, a notch 46 opening toward the outer peripheral side is formed in a portion where the support plate portion 43 is formed, and the notch 46 is provided in the support plate portion 43. Is connected to the through hole 430. The notch 46 includes a first notch portion 461 provided on the other side L2 in the axis L direction, and a second notch portion 462 connected to the first notch portion 461 on the one side L1 in the axis L direction. Therefore, the circumferential dimension of the first cutout portion 461 is shorter than the circumferential dimension of the second cutout portion 462.

  In the second cylindrical portion 42 of the tubular member 4, a partition wall 47 that closes the first notch portion 461 radially inward is formed inside the first notch portion 461 in the radial direction. , And is connected to the end surface 410 on the one side L1 of the first cylindrical portion 41 in the axis L direction. Further, the radially inner surface 470 of the partition wall 47 constitutes a surface continuous with the inner peripheral surface 411 of the first cylindrical portion 41, and is in contact with the outer peripheral surface 30 of the rotary shaft 3 as shown in FIG. .

  As shown in FIG. 3, a hole 36 is formed in the rotary shaft 3 in a direction orthogonal to the axis L, and a shaft body 37 is fitted in the hole 36. In this state, one end portion (shaft portion 370) of the shaft body 37 projects from the outer peripheral surface 30 of the rotary shaft 3. Therefore, when the rotating shaft 3 rotates around the axis L and the shaft portion 370 comes into contact with the partition wall 47 from the circumferential direction, the rotating shaft 3 and the tubular member 4 rotate integrally around the axis L. However, when the shaft portion 370 and the partition wall 47 are separated from each other in the circumferential direction, even if the rotary shaft 3 rotates about the axis L, the tubular member 4 does not rotate. In this way, the tubular member 4 is configured to be rotatable integrally with the rotary shaft 3 with play in the circumferential direction.

  The ratchet member 5 is provided with an annular portion 51 located around the second cylindrical portion 42 of the tubular member 4 and a counterclockwise direction around the axis L from a position separated from the outer edge of the annular portion 51 in the angular direction of 180 °. It has two arm portions 52 and 53 extending to the CCW. The arms 52 and 53 are respectively supported on the surfaces from the other side L2 in the direction of the axis L by the support plates 43 and 44 of the tubular member 4 described with reference to FIG.

  The tips of the arms 52 and 53 are claws 520 and 530 that are bent obliquely toward one side L1 in the direction of the axis L. The claws 520 and 530 are engaged with a plurality of engaging recesses 715 (see FIG. 4) formed on the surface of the first gear 71 on the other side L2 in the direction of the axis L. Therefore, the claws 520 and 530 of the ratchet member 5 and the engagement recess 715 of the first gear 71 constitute the one-way clutch 15. Therefore, when the ratchet member 5 attempts to rotate in the counterclockwise CCW direction (one side around the axis L) with respect to the first gear 71, the claw portions 520 and 530 cause the first gear 71 to rotate. And the counterclockwise CCW of the ratchet member 5 about the axis L of the ratchet member 5 is prevented from rotating relative to the first gear 71. On the other hand, when the ratchet member 5 attempts to rotate in the clockwise direction CW (the other side around the axis L) around the axis L with respect to the first gear 71, the arms 52 and 53 are bent. Since the engagement by the claws 520 and 530 is released, relative rotation of the ratchet member 5 with respect to the first gear 71 in the clockwise direction CW about the axis L is allowed.

A mainspring holding portion 55, which protrudes toward the other side L2 in the direction of the axis L from the portion corresponding to the base of the arm portion 52 on the inner peripheral edge of the annular portion 51 and is then bent outward in the radial direction, is formed. The mainspring holding portion 55 holds the inner end portion of the mainspring 2. In the present embodiment, the mainspring holding portion 55 is fitted into the notch 46 of the tubular member 4, and the tip end side thereof projects outward in the radial direction from the first notch portion 461. Here, since the mainspring holding portion 55 is fitted in the first cutout portion 461, the wall portions on both sides in the circumferential direction of the first cutout portion 461 are in contact with the mainspring holding portion 55. Therefore, the ratchet member 5 and the tubular member 4 rotate integrally around the axis L in both the clockwise CW direction and the counterclockwise CCW direction.

  Further, on the inner peripheral edge of the annular portion 51, a convex portion 511 that protrudes radially inward in the angular direction forming an angle of about 120 ° with respect to the mainspring holding portion 55 and is fitted into the concave portions 421 and 422 of the tubular member 4, 512 is formed. Therefore, the ratchet member 5 is positioned in the circumferential direction with respect to the tubular member 4 by fitting the projections 511 and 512 into the recesses 421 and 422.

  The cylindrical portion 712 of the first gear 71 is pressed against the ratchet member 5 by the retaining ring 76, the cylindrical sleeve 77, and the friction plate 78. Therefore, the torque limiter 16 is formed between the first gear 71 and the rotary shaft 3 by the friction coupling portion 160 between the friction plate 78 and the cylindrical portion 712 of the first gear 71.

(motion)
In the mainspring time switch 1 of the present embodiment, when the rotating shaft 3 is rotated in the clockwise direction CW about the axis L, the partition wall 47 of the tubular member 4 is rotated around the axis L by the shaft portion 370 of the rotating shaft 3. Since the cylindrical member 4 is pressed in the CW direction, the tubular member 4 rotates in the clockwise CW direction about the axis L. Therefore, the mainspring holding portion 55 of the ratchet member 5 is pressed by the tubular member 4 in the clockwise direction CW about the axis L to rotate, so that the mainspring 2 can be wound up. At that time, since the friction coupling portion 160 (torque limiter 16) is formed between the rotary shaft 3 and the first gear 71, the first gear 71 does not rotate. When the ratchet member 5 rotates in the clockwise CW direction about the axis L, the one-way clutch 15 between the ratchet member 5 and the first gear 71 has the ratchet member 5 in the clockwise CW direction about the axis L. Since the ratchet member 5 is allowed to rotate in the clockwise direction, the ratchet member 5 rotates in the clockwise direction CW about the axis L.

  At that time, when resetting the set time to the shorter one, after rotating the rotary shaft 3 in the clockwise direction CW about the axis L, the rotary shaft 3 is rotated in the opposite direction (clockwise CW around the axis L). Direction). At that time, the shaft portion 370 of the rotary shaft 3 is separated from the partition wall 47 of the tubular member 4, so that the tubular member 4 does not rotate about the axis L in the counterclockwise CCW direction. Further, since the frictional coupling portion 160 (torque limiter 16) idles between the rotating shaft 3 and the first gear 71, the first gear 71 does not rotate. Further, even if the ratchet member 5 tries to rotate in the counterclockwise CCW direction about the axis L, such rotation is blocked by the one-way clutch 15 between the ratchet member 5 and the first gear 71. Therefore, since the ratchet member 5 and the tubular member 4 do not rotate in the counterclockwise CCW direction about the axis L, the mainspring 2 does not rewind.

  After that, when the rotary shaft 3 is opened, the mainspring 2 is released. Therefore, when the mainspring holding portion 55 of the ratchet member 5 is pressed around the axis L in the counterclockwise CCW direction by the driving force of the mainspring 2, The 1st gear 71 is pressed by the ratchet member 5 around the axis L in the counterclockwise CCW direction and rotates. The rotating shaft 3 is pressed by the first gear 71 in the counterclockwise CCW direction about the axis L, and rotates about the axis L in the counterclockwise CCW direction. Further, since the shaft portion 370 is pressed around the axis L in the counterclockwise CCW direction by the partition wall 47 of the tubular member 4, the rotary shaft 3 rotates around the axis L in the counterclockwise CCW direction. Therefore, the time from the angular position set by the rotary shaft 3 until the rotary shaft 3 returns to the origin position can be set as the set time.

(Main effects of this embodiment)
As described above, in the mainspring time switch 1 of the present embodiment, the mainspring holding portion 55 of the ratchet member 5 that holds the inner end portion of the mainspring 2 is the first cutout portion of the cutout 46 of the tubular member 4. The tubular member 4 is fitted into the cylindrical member 4, and a partition wall 47 is provided inside the first cutout portion 461 in the radial direction and interposed between the mainspring holding portion 55 and the rotary shaft 3. Therefore, even when the mainspring 2 is pressed inward in the radial direction by the mainspring 2 when the mainspring 2 is wound up by rotating the rotary shaft 3 in the clockwise CW direction, the mainspring holding portion 55 and the rotary shaft 3 are not separated from each other. Since the contact is blocked by the partition wall 47, the situation where the mainspring holding portion 55 bites into the rotary shaft 3 is unlikely to occur. Therefore, for example, after rotating the rotating shaft 3 and the tubular member 4 in the clockwise CW direction to wind up the mainspring 2, the rotating shaft 3 is rotated in the opposite direction (counterclockwise CCW direction) to set the set time. When setting the shorter one again, the ratchet member 5 rotates in the opposite direction in conjunction with the rotating shaft 3 until the shaft portion 370 of the rotating shaft 3 contacts the partition wall 47 of the tubular member 4. Since it does not occur easily, the occurrence of breakage of the mainspring 2 and loosening of the mainspring 2 can be suppressed.

  Further, in the tubular member 4, the partition wall 47 is connected to the end surface 410 of the first cylindrical portion 41. The radially inner surface of the partition wall 47 constitutes a surface continuous with the inner peripheral surface 411 of the first cylindrical portion 41. For this reason, since the partition wall 47 has high strength, the shaft portion 370 of the rotary shaft 3 comes into contact with the partition wall 47 from the circumferential direction so that the rotary shaft 3 and the tubular member 4 rotate integrally. Also, the partition wall 47 is less likely to be damaged.

  Further, since the tubular member 4 is provided with the support plate portions 43 and 44 that project outward in the radial direction and support the ratchet member 5 on the surface from the side opposite to the first gear 71, the ratchet member 5 is secured. Can be supported by. Therefore, the deformation of the ratchet member 5 can be suppressed.

  Further, the tubular member 4 is formed with concave portions 421 and 422 for fitting the convex portions 511 and 512 formed on the ratchet member 5 to position the ratchet member 5 in the circumferential direction. Therefore, since the ratchet member 5 can be properly aligned with the tubular member 4, the mainspring holding portion 55 of the ratchet member 5 is fitted into the notch 46 of the tubular member 4 when the mainspring time switch 1 is assembled. Is easy to do.

1 ... spring type time switch, 2 ... spring, 3 ... rotary shaft, 4 ... cylindrical member, 5 ... ratchet member, 7 ... transmission mechanism, 8 ... speed adjusting mechanism, 11 ... case, 12 ... cover, 15 ... one-way clutch , 16 ... Torque limiter, 37 ... Shaft body, 41 ... First cylindrical portion, 42 ... Second cylindrical portion, 43, 44 ... Support plate portion, 46 ... Notch, 47 ... Partition wall, 51 ... Annular portion, 52 , 53 ... Arm part, 55 ... Mainspring holding part, 71 ... First gear (gear) 78 ... Friction plate, 160 ... Friction coupling part, 370 ... Shaft part, 421, 422 ... Recessed part, 425 ... Rib, 430 ... Through hole , 461 ... First cutout portion, 462 ... Second cutout portion, 511, 512 ... Convex portion, 520, 530 ... Claw portion, 715 ... Engagement recessed portion, L ... Axis line

Claims (6)

A mainspring type time switch driven by a mainspring,
A rotation axis that can rotate around the axis,
A gear arranged coaxially with the rotating shaft and coupled to the rotating shaft via a torque limiter,
A cylindrical tubular member in which the mainspring is wound around an outer peripheral surface and which is rotatable integrally with the rotary shaft with play in the circumferential direction,
An engaging pawl that engages with the gear when rotating to one side around the axis and is disengaged from the gear when rotating to the other side around the axis, and an inner end of the mainspring A ratchet member having a mainspring holding portion for holding the portion,
Have
The cylindrical member has a notch opened at the outer peripheral surface of the cylindrical member and fitted with the mainspring holding portion, and is interposed between the mainspring holding portion and the rotary shaft on a radially inner side of the notch. A mainspring time switch characterized in that it is provided with a partition wall.   The mainspring time switch according to claim 1, wherein the torque limiter is a friction coupling portion provided between the rotary shaft and the gear. The tubular member is connected to the first cylindrical portion fitted to the rotating shaft and to one side in the axial direction of the first cylindrical portion with an inner diameter larger than that of the first cylindrical portion, and the cutout and the partition wall are connected to each other. And a second cylindrical portion provided,
The partition wall is connected to the one end surface of the first cylindrical portion in the axial direction,
The tubular member is rotatable integrally with the rotary shaft when a shaft portion protruding radially outward from the rotary shaft comes into contact with the partition wall in the circumferential direction. The spring time switch described in 2.   4. The spiral spring according to claim 3, wherein the radially inner surface of the partition wall forms a surface continuous with the inner peripheral surface of the first cylindrical portion and is in contact with the outer peripheral surface of the rotating shaft. Expression time switch.   5. The tubular member is provided with a support plate portion that projects outward in the radial direction and supports the ratchet member on the surface from the side opposite to the gear, and the support plate portion according to claim 1. Mainspring time switch described in the item.   6. The cylindrical member is provided with a concave portion for fitting a convex portion formed on the ratchet member to position the ratchet member in the circumferential direction, and forming a concave portion on the ratchet member. Mainspring time switch described in the item.

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