Timer

Abstract

The present invention relates to the technical field of household appliances, and particularly to a timer, which includes a turntable, a driving wheel, a transmission device, a motor, and a blocking structure. The turntable is sequentially provided with a connection position, a disconnection position, and a long-through position along a first direction on its periphery. When the turntable is in the connection position and the long-through position, the motor starts, and when the turntable is in the disconnection position, the motor stops. The motor drives the driving wheel to rotate. One end of the transmission device rotates synchronously with the turntable, and the other end of the transmission device is connected to the driving wheel. When the turntable is in the connection position, the transmission device moves synchronously with the driving wheel. When the turntable is in the long-through position, the blocking structure blocks the transmission device to stop its movement, and the driving wheel rotates relative to the transmission device. The timer of the present invention realizes the long-through function with a simple structure without increasing the occupied volume, has a low cost, and a stable working condition.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a timer. Background Art

[0002] At present, timers are widely used in various household appliance products and are well-known to people. The timers in the prior art generally include three parts: one part is a power component, which consists of a spring and a one-way mechanism for winding the spring, so that when manually turned, the spring can only be wound up and will not rotate in the reverse direction to release the spring. Therefore, the power of the whole system is provided by tightening the spring; another part is a mechanism for releasing the energy of the spring, which is composed of a series of gear transmissions to increase the number of rotation cycles when the spring is relaxed. At the end of the gear train, an escapement wheel, an escapement pawl and a hairspring are provided to ensure that the rotation speed of the gear train driven by the spring is constant. The above-mentioned hairspring has an adjusting device capable of adjusting its length to adjust the oscillation frequency of the escapement pawl, so as to ensure that the gear train rotates at a set speed, will not release the spring all at once, and is not affected by the tightness of the spring to cause changes in the rotation speed; the third part is a timing trigger mechanism. When the spring is tightened, the timing trigger mechanism is also triggered synchronously, that is, the contacts of the device to be timed are closed and the timing function is completed.

[0003] The above-mentioned existing timers can usually achieve the function of timing stop. However, when the set time exceeds the preset range of the timer or long-term connection is required, the existing timers are difficult to complete the task. For this reason, some existing patents provide timers with independent long-term connection switches. When the long-term connection function is needed, the long-term connection switch is turned on separately. This design requires an additional switch, and due to its association with the function of the timer, the operation is not intuitive and is prone to misoperation. Some other existing designs have added an independent dial for the long-term connection function by changing the mechanical structure inside the timer to achieve the long-term connection function. This design increases the complexity of the timer structure, is unstable during operation, and due to the increase in parts, the volume of the timer also increases relatively, resulting in further occupation of the space for the operation part of the household appliance. There is an urgent need in the market for a timer that occupies a small space, is stable in use and has a long-term connection function. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention proposes a timer, which realizes the long-term connection function by improving the mechanical structure without increasing the overall volume and the complexity of parts, reduces the cost compared with the prior art, has low processing difficulty, and is stable and durable.

[0005] A timer, comprising a turntable, a driving wheel, a transmission device, a motor and a blocking structure. The turntable is sequentially provided with a connection position, a disconnection position and a long-through position along a first direction on its periphery. When the turntable is in the connection position and the long-through position, the motor starts; when the turntable is in the disconnection position, the motor stops. The motor drives the driving wheel to rotate.

[0006] One end of the transmission device rotates synchronously with the turntable, and the other end of the transmission device is connected to the driving wheel. When the turntable is in the connection position, the transmission device moves synchronously with the driving wheel. When the turntable is in the long-through position, the blocking structure blocks the transmission device to stop its movement, and the driving wheel rotates relative to the transmission device.

[0007] In one embodiment, the transmission device includes a transmission shaft and a second connecting member. The second connecting member is disposed on one side disk surface of the driving wheel. The transmission shaft penetrates through the second connecting member and the driving wheel. The transmission shaft and the second connecting member rotate synchronously, and the second connecting member connects the driving wheel and the transmission shaft.

[0008] In one embodiment, the second connecting member is a disc spring or a ratchet mechanism.

[0009] In one embodiment, the transmission device further includes a first connecting member. The first connecting member is disposed on the other side of the driving wheel relative to the second connecting member. The first connecting member is fixedly connected to the transmission shaft and the turntable respectively. The first connecting member is a disc spring.

[0010] In one embodiment, a blocking member is further disposed on the transmission device. When the turntable is in the long-through position, the blocking member can interfere with the blocking structure.

[0011] In one embodiment, the disconnection position of the turntable is a positioning groove on the outer edge of the turntable, and the connection position and the long-through position are the outer edge surfaces on both sides of the positioning groove.

[0012] In one embodiment, a linkage device and a power switch are further included. The power switch can control the start and stop of the motor. When the turntable is in the long-through position and the connection position, the turntable drives the linkage device to connect the power switch; when the turntable is in the disconnection position, the turntable drives the linkage device to disconnect the power switch.

[0013] In one embodiment, the interlocking device includes a connecting rod and a lug. The lug is provided at one end of the connecting rod. The connecting rod rotates about a certain point thereon, and the lug slides along the outer edge surface of the turntable. The power switch includes a moving contact piece and a static contact piece, and the moving contact piece moves synchronously with the connecting rod. When the turntable is in the connected position and the long-through position, the connecting rod drives the moving contact piece to contact the static contact piece. When the turntable is in the disconnected position, the connecting rod drives the moving contact piece to separate from the static contact piece.

[0014] In one embodiment, a bell-ringing device is further included. The bell-ringing device includes a bell body, a bell hammer, a torsion spring, and a synchronizing rod. The synchronizing rod moves synchronously with the interlocking device. The bell hammer is movably connected to the synchronizing rod through the torsion spring, and the bell hammer can strike the bell body.

[0015] In one embodiment, a housing is further included. The turntable, the driving wheel, the transmission device, the motor, and the blocking structure are all arranged inside the housing, and the blocking structure is arranged on the inner wall of the housing.

[0016] Advantageous Effects

[0017] For the timer of the present invention, different functions can be achieved by turning it to both sides from the disconnected position. The operation is simple and logical. Moreover, compared with the relatively complex implementation methods in the prior art, by adding a blocking structure and a structure with an overload protection function, the long-through function is realized without increasing the occupied volume, ensuring the simplicity of the structure, low cost, and stable working conditions. Description of the Drawings

[0018] Figure 1 It is one schematic diagram of the timer of the present invention;

[0019] Figure 2 It is another schematic diagram of the timer of the present invention;

[0020] Figure 3 It is a schematic diagram of the transmission device of the timer of the present invention;

[0021] Figure 4 It is a schematic diagram of the blocking structure of the timer of the present invention;

[0022] Figure 5 It is one schematic diagram of the bell-ringing device of the timer of the present invention;

[0023] Figure 6 It is another schematic diagram of the bell-ringing device of the timer of the present invention;

[0024] Among them, 1 is a turntable, 2 is a reduction gear set, 3 is a driving wheel, 4 is a transmission device, 5 is an interlocking device, 6 is a power switch, 7 is a housing, 41 is a transmission shaft, 42 is a first connecting member, 43 is a second connecting member, 44 is a blocking member, 71 is a bell body, 72 is a hammer, 73 is a torsion spring, 74 is a synchronizing rod, 8 is a housing, and 81 is a boss. Detailed implementation manners

[0025] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following describes the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0031] Refer to Figure 1 、 Figure 2 , Figure 1 As shown in, the timer of the present invention includes a turntable 1, a driving wheel 3, a transmission device 4, a motor and a blocking structure. The turntable 1 is sequentially provided with a communication position, a disconnection position and a long-through position along a first direction on its periphery. One end of the transmission device 4 of the present invention always rotates synchronously with the turntable 1, and the other end of the transmission device 4 is connected to the driving wheel 3. The transmission device 4 can be directly operated by the user. When the turntable 1 is driven by the transmission device 4 and is in the communication position and the long-through position, the motor starts. When the turntable 1 is in the disconnection position, the motor stops. The motor drives the driving wheel 3 to rotate. When the turntable 1 is in the communication position, the transmission device 4 and the driving wheel 3 move synchronously. When the turntable 1 is in the long-through position, the transmission device 4 is blocked by the blocking structure and stops moving, and the driving wheel 3 continues to move relative to the transmission device 4.

[0032] By providing the timer with the above structure, the timer of the present invention can achieve the following effects:

[0033] When the turntable 1 is adjusted to the connected position, the motor starts, and the driving wheel 3 starts to rotate under the action of the motor. Since the transmission device 4 is not blocked by the blocking structure, the driving wheel 3 and the transmission device 4 move synchronously. Under the transmission action of the transmission device 4, the turntable 1 is driven to rotate in the first direction. When the turntable 1 rotates from the connected position to the disconnected position, the motor stops, resulting in the driving wheel 3 no longer providing driving force for the transmission device 4, and the turntable 1 stays at the disconnected position. With such a setting, the operator can adjust the angular range of the connected position of the turntable 1 and the rotation speed of the turntable 1, so as to be able to adjust the time for the turntable 1 to rotate from the connected position to the disconnected position. And when the power supply of the device using this timer is interrelated with the motor state, the timing function of the device can be realized.

[0034] When the turntable 1 is adjusted to the long-connected position, due to the blocking effect of the blocking structure on the transmission device 4, at this time, the driving force of the driving wheel 3 on the transmission device 4 is not enough to overcome the blocking force, and the transmission device 4 is stationary relative to the driving wheel 3, so that the transmission device 4 no longer moves synchronously with the driving wheel 3. Affected by this, the turntable 1 also remains stationary, which makes the turntable 1 always stay at the long-connected position. Through this step, unless the turntable 1 is manually adjusted back to the disconnected position, the turntable 1 will always stay at the long-connected position. When the power supply of the device using this timer is interrelated with the motor state, the long-time startup of the device can be realized.

[0035] Specifically, in one embodiment, the transmission device 4 of the present invention is as Figure 3 shown. The transmission device 4 includes a transmission shaft 41 and a second connecting member 43. The second connecting member is arranged on one side disk surface of the driving wheel. The transmission shaft 41 penetrates through the second connecting member 43 and the driving wheel 3. The transmission shaft 41 and the second connecting member 43 rotate synchronously, and the second connecting member 43 connects the driving wheel 3 and the transmission shaft 41.

[0036] Furthermore, as Figure 3 shown, in one embodiment, the second connecting member 43 is a disc spring, and the second connecting member 43 is frictionally connected with the disk surface of the driving wheel 3. In this embodiment, when the operator twists the transmission shaft 41 to make the turntable 1 in the connected position, the transmission device 4 is not blocked by the blocking structure, and the frictional force between the driving wheel 3 and the disc spring can drive the disc spring to move synchronously, and the turntable 1 is synchronously driven to rotate towards the disconnected position through the transmission shaft 41.

[0037] When the operator turns the transmission shaft 41 to place the turntable 1 in the long-through position, since the transmission device 4 is blocked by the blocking structure, the frictional force of the driving wheel 3 on the disc spring is not sufficient to overcome the resistance received by the transmission device 4, resulting in slippage between the disc spring and the driving wheel 3. Since the disc spring is not driven by the driving wheel 3, under the action of the transmission shaft 41, the turntable 1 will not rotate. In this state, although the motor drives the driving wheel 3 to rotate continuously, the turntable 1 always remains stationary and stays in the long-through position.

[0038] It should be noted that the second connecting member 43 obviously has more than just the form of a disc spring. For example, the second connecting member 43 can also be a ratchet mechanism or other forms. Any mechanism that can achieve the effect of stopping synchronous movement during overload can implement the technical solution of the present invention.

[0039] It is worth noting that in one embodiment, the transmission device further includes a first connecting member 42. The first connecting member 42 is disposed on the other side of the driving wheel 3 relative to the second connecting member 43. The first connecting member 42 is fixedly connected to the transmission shaft 41 and the turntable 1 respectively. Preferably, in one embodiment, the first connecting member 42 is also a disc spring. The first connecting member 42 presses against the wheel surface of the driving wheel 3, so that there is also a frictional force between the first connecting member 42 and the driving wheel 3. With such a setting, since the forces exerted by the first connecting member 42 and the second connecting member 43 to squeeze the driving wheel 3 from both sides increase, according to the friction formula, the frictional forces between the first connecting member 42, the second connecting member 43 and the driving wheel 3 all increase. And since the first connecting member 42 and the second connecting member 43 rotate synchronously, the directions of the frictional forces between the first connecting member 42, the second connecting member 43 and the driving wheel 3 are the same. Therefore, when the transmission device 4 is not affected by the blocking structure, the driving wheel 3 can drive the turntable 1 to rotate more stably.

[0040] Specifically, in order to achieve the synchronous rotation of the transmission shaft 41, the first connecting member 42 and the second connecting member 43, a key connection can be provided between the first connecting member 42 and the transmission shaft 41, and between the second connecting member 43 and the transmission shaft 41. In one embodiment, the through holes of the first connecting member 42 and the second connecting member 43 are not circular, and the contour of the insertion portion of the transmission shaft 41 matches the through holes.

[0041] Specifically, in order to enable the transmission device 4 to be blocked by the blocking structure, a blocking member 44 is further provided on the transmission device 4 of the present invention. When the turntable 1 is in the long-through position, the blocking member 44 can interfere with the blocking structure. In one embodiment, as Figure 3As described above, when the transmission device 4 includes a transmission shaft 41, a first connecting member 42, and a second connecting member 43, the blocking member 44 is a blocking shaft extending radially along the driving wheel, which is provided on the transmission shaft 41 and protrudes from the wheel disc surface of the driving wheel 3.

[0042] Specifically, in one embodiment, as Figure 4 shown, the timer according to the present invention further includes a housing 8. The turntable 1, the driving wheel 3, the transmission device 4, the motor, and the blocking structure are all arranged inside the housing 8. The blocking structure is arranged on the inner wall of the housing 8, and the blocking structure interferes with the blocking member 44. For example, the blocking structure can be a boss 81. When the turntable 1 is in the long-through position, the blocking shaft rotates along with the transmission shaft 41, but the blocking shaft interferes with the boss 81 during the rotation process, resulting in the inability of the blocking shaft to move, and the transmission shaft 41 also cannot move, resulting in relative rest with the driving wheel 3.

[0043] Specifically, in one embodiment, the disconnection position of the turntable 1 is a positioning groove on the outer edge of the turntable, and the connection position and the long-through position are the outer edge surfaces on both sides of the positioning groove.

[0044] Specifically, the timer according to the present invention further includes an interlocking device 5 and a power switch 6. The power switch 6 can control the start and stop of the motor. The interlocking device 5 is driven by the turntable 1. When the turntable 1 is in the long-through position and the connection position, the interlocking device 5 connects the power switch 6. When the turntable 1 is in the disconnection position, the interlocking device 5 disconnects the power switch 6.

[0045] In one embodiment, the interlocking device 5 includes a connecting rod and a lug. The lug is arranged at one end of the connecting rod. The connecting rod rotates around a certain point on it. The lug slides along the outer edge surface of the turntable 1 and can be stuck in the positioning groove. The power switch 6 includes a moving contact piece and a static contact piece. The moving contact piece moves synchronously with the connecting rod. When the turntable 1 is in the connection position and the long-through position, the connecting rod drives the moving contact piece to contact the static contact piece, and the power switch 6 is connected. When the turntable 1 is in the disconnection position, the lug is stuck in the positioning groove, and the connecting rod drives the moving contact piece to separate from the static contact piece, and the power switch 6 is disconnected.

[0046] Specifically, the timer according to the present invention further includes a bell ringing device 7, as Figure 5 、 Figure 6As shown, the bell ringing device 7 includes a bell body 71, a bell hammer 72, a torsion spring 73 and a synchronizing rod 74. The synchronizing rod 74 moves synchronously with the interlocking device 5, and the bell hammer 72 is movably connected to the synchronizing rod 74 through the torsion spring 73. Taking the interlocking device 5 in the previous embodiment as an example, when the lug on the connecting rod enters the positioning groove from the outer edge of the turntable 1, the connecting rod rotates, and the synchronizing rod 74 synchronized with it rotates synchronously, causing the torsion spring 73 to be twisted. The torsion spring 73 applies a resilient force to the bell hammer 72, causing the bell hammer 72 to quickly strike the bell body 71 and ring the bell.

[0047] Specifically, as Figure 1 shown, the timer of the present invention further includes a reduction gear set 2. The motor is connected to the input end of the reduction gear set 2, and the output end of the reduction gear set 2 is connected to the driving wheel 3.

[0048] In summary, for the timer of the present invention, the operator rotates the transmission shaft 41. Since the transmission shaft 41 is fixedly connected to the first connecting member 42, and the first connecting member 42 and the turntable 1 are fixedly connected, the initial position of the turntable 1 can be set to the connected position, the long-through position, or the disconnected position. When the turntable 1 is turned to the connected position, the turntable 1 connects the power switch 6 through the interlocking device 5, and the motor starts to generate a driving force on the second connecting member 43. At this time, the blocking member 44 does not interfere with the blocking structure, and the second connecting member 43 rotates freely. The transmission shaft 41 is driven by it, successively driving the first connecting member 42 and the turntable 1. The turntable 1 rotates in the first direction until it rotates to the disconnected position. The lug on the connecting rod falls into the positioning groove in the disconnected position, the connecting rod approaches the turntable 1, and the moving contact piece moving synchronously with the connecting rod separates from the static contact piece, the power switch 6 is disconnected, and the motor stops working. At this time, the turntable 1, the transmission device 4, and the driving wheel 3 all stop moving. Moreover, when the lug falls into the positioning groove, the bell ringing device 7 is disturbed, causing its bell hammer 72 to collide quickly with the bell body 71, thus ringing the bell. Through the above operations, the device using this timer can achieve the timing function and has a ringing reminder.

[0049] When the turntable 1 is turned to the long-through position, at this time the turntable 1 connects the power switch 6 through the interlocking device 5. Since the blocking shaft interferes with the boss 81 on the housing 5, the blocking shaft cannot rotate, thereby preventing the rotation of the transmission shaft 41. At this time, there is a slipping situation between the second connecting member 43 and the driving wheel 3, that is, the driving wheel 3 rotates while the second connecting member 43 does not rotate. At this time, since the entire transmission device 4 has stopped moving, the turntable 1 is also stationary. With such a setting, the power switch will always remain connected. Through the above operations, the device using this timer can achieve the function of long-time power-on.

[0050] For the timer of the present invention, different functions can be achieved by twisting it to both sides from the off position. The operation is simple and logical. Moreover, compared with the relatively complex implementation methods in the prior art, by adding a blocking structure and a structure with overload protection function, the present invention ensures the simplicity of the structure, low cost, and stable working conditions without increasing the occupied volume.

[0051] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0052] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A timer, characterized in that, It includes a turntable, a driving wheel, a transmission device, a motor and a blocking structure. The turntable is successively provided with a connecting position, a disconnecting position and a long-through position along a first direction on its periphery. When the turntable is in the connecting position and the long-through position, the motor starts. When the turntable is in the disconnecting position, the motor stops. The motor drives the driving wheel to rotate. The transmission device includes a transmission shaft and a second connecting member. The second connecting member is arranged on one side wheel surface of the driving wheel. The transmission shaft penetrates through the second connecting member and the driving wheel. The transmission shaft and the second connecting member rotate synchronously. The second connecting member connects the driving wheel and the transmission shaft. The second connecting member is frictionally connected with the wheel surface of the driving wheel. The frictional force between the driving wheel and the second connecting member drives the second connecting member to move synchronously. One end of the transmission device rotates synchronously with the turntable. The other end of the transmission device is connected to the driving wheel. When the turntable is in the connecting position, the transmission device and the driving wheel move synchronously. When the turntable is in the long-through position, the blocking structure blocks the transmission device to stop its movement, and the driving wheel rotates relative to the transmission device. The transmission device further includes a first connecting member. The first connecting member is arranged on the other side of the driving wheel relative to the second connecting member. The first connecting member is fixedly connected to the transmission shaft and the turntable respectively. The first connecting member is a disc spring. A blocking member is also arranged on the transmission device. When the turntable is in the long-through position, the blocking member can interfere with the blocking structure.

2. The timer according to claim 1, wherein, The second connecting member is a disc spring or a ratchet mechanism.

3. The timer according to claim 1, wherein The disconnecting position of the turntable is a positioning groove on the outer edge of the turntable. The connecting position and the long-through position are the outer edge surfaces on both sides of the positioning groove.

4. The timer according to claim 1, characterized in that, It further includes an interlocking device and a power switch. The power switch can control the start and stop of the motor. When the turntable is in the long-through position and the connecting position, the turntable drives the interlocking device to connect the power switch. When the turntable is in the disconnecting position, the turntable drives the interlocking device to disconnect the power switch.

5. The timer according to claim 4, wherein, The interlocking device includes a connecting rod and a lug. The lug is arranged at one end of the connecting rod. The connecting rod rotates around a certain point on it. The lug slides along the outer edge surface of the turntable. The power switch includes a moving contact piece and a static contact piece. The moving contact piece moves synchronously with the connecting rod. When the turntable is in the connecting position and the long-through position, the connecting rod drives the moving contact piece to contact the static contact piece. When the turntable is in the disconnecting position, the connecting rod drives the moving contact piece to separate from the static contact piece.

6. The timer according to claim 1, wherein It further includes a ringing device. The ringing device includes a bell body, a bell hammer, a torsion spring and a synchronizing rod. The synchronizing rod moves synchronously with the interlocking device. The bell hammer is movably connected to the synchronizing rod through the torsion spring. The bell hammer can strike the bell body.

7. The timer according to claim 1, wherein It further includes a housing. The turntable, the driving wheel, the transmission device, the motor and the blocking structure are all arranged in the housing. The blocking structure is arranged on the inner wall of the housing.

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