Flat-head pin shaft and groove upper and lower clamping plates of mechanical timer
By adopting flat-head pin shaft and grooved upper and lower clamp structures, the processing and assembly process of oven mechanical timer parts is simplified, and the problems of complex structure and low processing efficiency in the existing technology are solved, achieving high efficiency and low cost Production and use effects.
Patent Information
- Application Number
- CN202310765738.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-27
- Publication Date
- 2024-12-27
AI Technical Summary
The components of the existing oven mechanical timer are complex, have many processing processes, and have high accuracy requirements, resulting in low production efficiency and high cost, making it difficult to achieve automated assembly.
The flat head pin shaft and groove upper and lower clamp structure are adopted to simplify the shape and processing process of parts, and quickly produce through mold stamping and forming, reducing drilling operations, improving assembly efficiency and reducing costs.
It realizes rapid processing and efficient assembly of parts, reduces production costs, simplifies processes, improves production efficiency, and ensures the accuracy and durability of the timer.
Smart Images
Figure CN119200371A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a mechanical timer, in particular to a pin shaft and a clamping plate of the mechanical timer. Background Art
[0002] Mechanical timers are widely used in daily life, such as alarm clocks and fans at room temperature, microwave ovens and ovens in high temperature environments, etc. The timing and bell reminder of the oven mechanical timer are integrated, and the bell rings once. Because it is used in a high temperature environment (above 100°C or even higher), the parts of the mechanical timer installed in the oven must be all made of metal materials or the timing disk and positioning disk must be made of high-temperature resistant plastic. The existing oven mechanical timer includes a bell, a hammer, a spring wire, a torsion spring driving shaft, a timing disk, a positioning disk, a cover, an upper splint, an open steel ring that presses the driving gear, a driving gear, a torsion spring, a driven gear, a spring that resets the first driven gear, a ratchet, a steel fork or a speed reduction mechanism of a swing weight disk, a lower splint, a cover bottom plate, a mounting connection frame and a rotating handle, and a side switch. The upper and lower splints, the torsion spring driving shaft, driving gear, torsion spring, driven gear, ratchet, steel fork or the speed reduction mechanism of the pendulum weight plate between the upper and lower splints are the movement of the timer. The overall structure of the upper, middle and lower parts is generally 3-5 cm long and wide, and the height is generally about 2 cm. The small size requires the precision of metal parts and small tolerance errors. There are the following shortcomings: 1. It is the speed reduction mechanism - steel fork or pendulum weight plate. The steel fork has two pin pendulum shafts installed on the head of the steel fork used in conjunction with the ratchet side; the tail of the steel fork is a Y-shaped mouth, which is used in conjunction with a pin pendulum shaft on the pendulum weight plate. A spring hairspring is installed on the pendulum weight plate shaft, and the other end of the spring hairspring is fixed on the upper splint. This structure has accurate timing but will stop secretly. The pendulum weight plate, which is used in conjunction with the ratchet, has two pin pendulum shafts installed on this side. The timer of such a pendulum weight plate is not as accurate as the steel fork timer, but it will not stop secretly. Both structures use pin swing shafts, which are made of stainless steel and require a size below 1 mm, generally 0.1-0.2 mm, with high machining accuracy requirements. The round hole drilling for installing the pin swing shaft requires precise positioning and small errors. The process is complicated and slow, with low efficiency and high cost. The assembly of the pin swing shaft requires fine operation and is difficult to achieve automated assembly. It is impossible to achieve extensive processing and installation while meeting the use requirements. 2. The pins of the driven gear, ratchet, steel fork or pendulum weight plate are all stepped pins. The two ends of the shaft are smaller than the main body of the shaft to become pins. The main body of the shaft is generally greater than 1 mm, and the pin is generally less than 1 mm. Such a shaft is a stepped pin, and the top of the stepped pin is a dot. The corresponding positions around the shaft hole of the torsion spring active shaft of the upper and lower splints used in conjunction with the stepped pin are accurately positioned and drilled, and circular holes are set. The stepped pin and the drilled upper and lower splints are installed to fix the driven gear, ratchet, steel fork or pendulum weight plate. The stepped pin has many processing steps and is slow. The drilling positioning must be precise and the processing accuracy must be high. The assembly operation of the stepped pin requires fineness, low efficiency, and high cost. It is impossible to achieve extensive processing and installation while meeting the use requirements. The holes of the upper and lower splints are also difficult to retain lubricating oil and are easy to dry. 3. The torsion spring active shaft, except for the rotating handle, is a cylindrical cone-shaped active shaft. The tail section of the torsion spring active shaft is processed into a conical step structure and the external thread at the tail of the tail section is used in conjunction with the bell in the center circular hole. Tighten the bell with a nut.The bell is installed in this way. The torsion spring driving shaft is a long shaft that runs through the entire timer. It is divided into a multi-stage cylindrical cone-shaped torsion spring driving shaft, with a torsion spring, driving gear and upper splint at the first level, a cover, a positioning plate and a timing plate at the first level, and then a bell at the first level. Because the cylindrical shaft needs to be anti-slip and twisting, a groove must be machined on the shaft to install an open round steel ring to press the driving gear and torsion spring, so high-temperature resistant plastic is used to make an integrated positioning plate and timing plate. Holes and pins must be drilled on the shaft to position and twist the positioning plate and timing plate. A groove is also machined after the tail section of the shaft to place the spring wire of the hammer. The torsion spring driving shaft is a multi-stage cylindrical cone-shaped structure with a complex structure. The cylindrical shaft needs to be anti-slip and twisting. Drilling, poking, and turning are two processing procedures that are more and slower. The shaft surface is not smooth and smooth, and the precision requirements are high. The assembly operation requires fineness, low efficiency, and high cost. It is difficult to achieve automated assembly, and it is impossible to achieve extensive processing and installation while meeting the use requirements. 4. The fixed axis of the bell hammer is riveted on the cover, and the hammer and the spring wire for reset are installed on the thin round shaft. A small steel ring is used to cover the thin round shaft to prevent it from falling off. One end of the spring wire passes through the small round hole on the hammer head and the other end is placed in the groove behind the tail of the torsion spring driving shaft. The cover needs to be opened and the thin round shaft is riveted to the cover, and then the hammer and spring wire are installed to prevent falling off. The process is complicated and slow, the efficiency is low, the cost is high, and it is difficult to realize automatic integrated processing of the cover, and it is impossible to achieve rough processing and installation to meet the use requirements. The above four points are the shortcomings of the existing oven mechanical timer, which are all caused by the shape structure of the existing parts or the structure of the product, resulting in the low efficiency of the entire production process, high production cost, and difficulty in realizing more automated assembly or processing. Now a series of improvements are made to the above four shortcomings, such as improving the shape structure, size, and product structure of the parts, reducing the process, simplifying the processing, reducing the production cost, achieving rough processing and installation to meet the use requirements, and realizing more automated assembly or processing. Separate applications are made as follows. Summary of the invention
[0003] The present invention discloses a flat pin shaft of a mechanical timer and grooved upper and lower clamping plates of the mechanical timer, which solve the problem that the stepped pin shaft and the drilled upper and lower clamping plates described in the background art cannot be processed and installed roughly and can meet the use requirements. The technical solution is as follows.
[0004] The flat pin shaft of the mechanical timer comprises a pin shaft of a driven gear, a pin shaft of a ratchet wheel and a pin shaft of a swing weight plate. The pins at both ends of the pin shaft have the same size as the main shaft and the pin shaft top is flat.
[0005] There is a 90° transition between the pin shaft top plane and the pin shaft surface.
[0006] There is a chamfer transition between the pin shaft top plane and the pin shaft surface.
[0007] There is an inclined transition between the pin shaft top plane and the pin shaft surface.
[0008] The grooved upper and lower clamps of the mechanical timer include the upper and lower clamps, the shaft holes of the torsion spring driving shafts of the upper and lower clamps, and the first strip groove corresponding to one end of the flat head pin shaft of the first driven gear of the mechanical timer, the second circular groove corresponding to the flat head pin shaft of the second driven gear, the third circular groove corresponding to the flat head pin shaft of the third driven gear, the fourth circular groove corresponding to the flat head pin shaft of the ratchet, and the fifth circular groove corresponding to the flat head pin shaft of the swing weight plate are sequentially arranged around the shaft holes of the upper and lower clamps. The timer with three driven gears is generally used for timers with longer timing, such as timing for sixty minutes.
[0009] The grooved upper and lower clamps of the mechanical timer include the upper and lower clamps, the shaft holes of the torsion spring driving shafts of the upper and lower clamps, and the first strip groove corresponding to one end of the flat head pin shaft of the first driven gear of the mechanical timer, the second circular groove corresponding to the flat head pin shaft of the second driven gear, the third circular groove corresponding to the flat head pin shaft of the ratchet wheel, and the fourth circular groove corresponding to the flat head pin shaft of the swing weight plate are sequentially arranged around the shaft holes of the upper and lower clamps. The timer with two driven gears is generally used for timers with shorter timing, such as five minutes.
[0010] Beneficial effect: Compared with the existing stepped pins and drilled upper and lower clamps, the two pins of the flat pin are consistent with the size of the main shaft, easy to process quickly, the shaft size is slightly larger, and the top plane of the shaft is also easy to process; the upper and lower clamps with grooves do not need to be drilled, and can be stamped and formed quickly by molds, with fewer processes, high efficiency and low cost, and can achieve rough processing and installation and meet the use requirements. The chamfered flat pin matches the circular grooves of the upper and lower clamps, rotates smoothly, and can seal the lubricating oil so that it is not easy to dry. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural schematic diagram of a notched reduction chuck; Figure 2 It is a structural diagram of a weight plate; Figure 3 It is a schematic diagram of the structure of a flat pin shaft; Figure 4 It is a schematic diagram of the assembly of the notched speed reduction chuck and the swing weight plate; Figure 5 It is a schematic diagram of the assembled notched reduction chuck and ratchet in use; Figure 6 It is a structural schematic diagram of the lower splint; Figure 7 It is a structural schematic diagram of the upper splint; Figure 8 is a schematic diagram of the structure of the cover; Fig. 9 It is a schematic diagram of the structure of the torsion spring driving shaft; Fig.10 It is a diagram of the internal structure of the bell; Fig.11 is a schematic diagram of the top structure of the upper clamping plate with the cover removed; Fig.12 It is a structural schematic diagram of the upper clamping plate top of the cover shell being opened; Fig.13 This is an exploded view of the less covered shell; Fig.14 This is a schematic diagram of the entire bell mechanical timer. Implementation
[0012] Notes on the drawings: Components are indicated by numbers, the structure of components or components of components are indicated by capital letters, and the parts below are indicated by numbers.
[0013] Bell 1, hammer 2, spring wire 3, torsion spring driving shaft 4, timing disk 5, positioning disk 6, cover 7, upper splint 8, driving gear 9, torsion spring 10, first driven gear 11, second driven gear 12, third driven gear 13, ratchet 14, notched reduction chuck 15, pendulum weight disk 16, flat head pin shaft 17, lower splint 18, driving gear clamping disk 19, spring switch key 20, spring 21, installation connecting frame 22.
[0014] This specific implementation method solves the deficiencies of the four points of the background technology, proposes a series of improvements, discloses the following technical solutions, and applies separately. The invention is further explained in conjunction with the accompanying drawings of the oven bell mechanical timer, but is not limited to the use of the oven bell mechanical timer. Parts not involved in this case are omitted.
[0015] like Figure 1 As shown, the notched deceleration chuck 15 is circular, and its thickness can be greater than that of the ratchet 14, and the notch 15A is a symmetrical arc shape, with the shaft hole 15B at its center. Figure 5 As shown, the notch 15A crosses three ratchet teeth as a unit and contacts the ratchet 14 to decelerate. The notch deceleration chuck 15 is much larger than the pin swing shaft. The notch deceleration chuck 15 is made of metal material and is formed by die stamping.
[0016] like Figure 2 As shown, the weight-swinging plate 16 is circular, and the thickness and size can be determined according to requirements. The notch shape is divided into three equal parts, and the notch 16A is a symmetrical arc shape, with the shaft hole 16B at the center and the flat pin 17. The weight-swinging plate 16 can have other shapes and structures, such as a plate that is approximately rectangular, a round wheel with holes divided into three equal parts, and a round plate with notches divided into three equal parts. The shape and structure that can achieve a fixed frequency left and right swing is the weight-swinging plate. The weight-swinging plate 16 is made of metal material and is formed by die stamping.
[0017] like Figure 3As shown, the first driven gear 11, the second driven gear 12, the third driven gear 13 and the ratchet 14 include a large gear, an axis and a small gear with 6, 7 or 8 teeth on the axis surface, the axis of the swing weight plate 16 and the notch speed reduction chuck 15, and the pins used between the upper and lower clamping plates are all flat pins 17, which are consistent in size, generally have a diameter of 1-2 mm, and are the same in length, and match the size between the upper clamping plate 8 and the lower clamping plate 18. The flat pin 17 includes a pin 17A and a main shaft 17B at both ends. The pin 17A is consistent in size with the main shaft 17B. The top of the flat pin 17 is a plane 17C, and the plane 17C and the axis surface are chamfered 17D transition. The pin 17A is inserted into the groove of the upper clamping plate and the lower clamping plate. The top plane 17C of the flat pin 17 and the axis surface can be 90° transition or bevel transition. The flat pin 17 can be formed by cutting and chamfering iron wire or stainless steel wire.
[0018] like Figure 4 , Figure 5 As shown, the notched deceleration chuck 15 is smaller than the swing weight plate 16, and the notch 15A of the notched deceleration chuck 15 is located between two adjacent notches 16A of the swing weight plate 16. The notch 15A is stamped and assembled into one piece by utilizing the tolerance of the shaft holes 15B, 16B and the flat head pin 17; the swing weight plate 16 and the notched deceleration chuck 15 are separate, and the mold stamping process can produce multiple products from one mold. Figure 5 As shown, one side of the pendulum weight plate 16 is a notched deceleration chuck 15. The notched deceleration chuck 15 and the pendulum weight plate 16 are processed as one body and are inseparable, and are suitable for smaller-sized spaces; the mold cold heading process is carried out one by one. The notched deceleration chuck 15 includes the weight of the pendulum weight plate 16 and has the function of pendulum weight. The notched deceleration chuck 15 and the pendulum weight plate 16 are integrated into one body, for example, a plate with holes divided into three equal parts, and a notch is set between adjacent openings. Increasing the size of the notched deceleration chuck 15 increases the weight of the pendulum weight, and is suitable for larger-sized spaces. The notched deceleration chuck 15 can have other shapes and structures. The notched deceleration chuck 15 and the pendulum weight plate 16 can also be used in conjunction with existing stepped pins.
[0019] like Figure 5 As shown, the notch 15A of the assembled notch reduction chuck 15D is used in contact with the large gear 14A of the ratchet 14, with 3 teeth as one unit. The number of teeth as one unit depends on the requirements to achieve deceleration.
[0020] like Figure 6As shown, the lower clamping plate 18 is provided with an axial hole 18A, the diameter of which corresponds to the diameter of the middle shaft 4B of the torsion spring driving shaft 4, and the first strip groove 18B of the first driven gear corresponding to the pins 17A at both ends of the flat-head pin shaft 17 is sequentially arranged around the axial hole 18A, and one end of the strip groove 18B is close to the axial hole 18A, the second circular groove 18C of the second driven gear, the third circular groove 18D of the third driven gear, the fourth circular groove 18E of the ratchet 14, and the fifth circular groove 18F of the swing weight plate 16. The buckle 18G for accommodating the torsion spring 10 and the torsion spring connecting buckle 18H are arranged around the axial hole 18A. The lower clamping plate 18 is provided with a bayonet for connecting the upper clamping plate 8 and the cover 7. The lower clamping plate 18 is formed by continuous die stamping of metal sheets.
[0021] like Figure 7 As shown, a shaft hole 8A is formed on the top plate 8G of the upper clamping plate 8. The diameter of the shaft hole 8A is slightly smaller than the diameter of the tail section shaft 4C of the first step of the torsion spring driving shaft 4 so as to prevent the entire torsion spring driving shaft 4 from loosening backward. The first strip groove 8B of the first driven gear corresponding to the pins 17A at both ends of the flat pin shaft 17 is sequentially arranged around the shaft hole 8A. One end of the strip groove 8B is close to the shaft hole 8A, the second circular groove 8C of the second driven gear, the third circular groove 8D of the third driven gear, the fourth circular groove 8E of the ratchet 14, and the fifth circular groove 8F of the swing weight plate 16. A hole 8H and a buckle 8K for installing the spring 21 are arranged outside the first strip groove 8B, a buckle 8M for the spring switch key is arranged on the side of the side plate 8L, and a buckle for connecting the lower clamping plate 18 is arranged on the lower side of the side plate 8L. The upper clamping plate 8 is formed by continuous die stamping and bending of metal sheets. The first strip groove 8B near the shaft hole 8A at one end allows the first driven gear 11 to leave the driving gear 9 on the torsion spring driving shaft during the torsion timing, and can close the driving gear 9 during the working rotation. The spring 21 is used to allow the flat pin 17 of the first driven gear 11 to move back and forth in the first strip grooves 8B and 18B. For a longer timing period, such as sixty minutes, three driven gears can be used, and the upper and lower clamps can be provided with grooves for three driven gears; for a shorter timing period, such as five minutes, two driven gears can be used, and the upper and lower clamps can be provided with grooves for two driven gears. The chamfered flat pin is used in conjunction with the strip grooves and circular grooves of the upper and lower clamps to fix and rotate the pin. Punching the grooves is fast, and fewer holes are drilled, which significantly improves efficiency.
[0022] like Figure 8As shown, the cover 7 of the mechanical timer with the fixed axis of the bell hammer punched out includes a cover top wall 7F and a side wall 7G. A buckle connecting the lower clamp 18 is provided at the bottom of the side wall 7G. A spring switch key through hole 7B is opened on the cover top wall 7F on the side of the spring switch key 20. An axial hole 7A is opened at the center of the cover top wall 7F facing the spring switch key through hole 7B. The diameter of the axial hole 7A is slightly larger than the diameter of the second step tail section axis 4D. The fixed axis 7C of the bell hammer 2 is punched out from the cover top wall 7F on the side of the spring switch key through hole 7B in the direction from the spring switch key through hole 7B to the axial hole 7A. The fixed axis 7C is sheet-shaped, and buckles 7D are provided on both sides of the sheet-shaped fixed axis 7C. A fixing buckle 7E for the spring wire 3 is opened on the cover top wall 7F on the side of the axial hole 7A. The cover 7 is formed by continuous die stamping and bending of metal sheet. As shown Fig.10 , Fig.11 , Fig.12 As shown, one end of the spring wire 3 passes through the spring wire through hole 2D on the hammer 2, and the axial hole 2A of the hammer 2 and the spring wire 3 are wound on the buckle 7D of the sheet-shaped fixed shaft 7C on the cover 7, and the other end of the spring wire 3 is installed in the fixed buckle 7E, and the spring wire 3 allows the power arm 2B to press the spring switch key 20 on the inside all the time; the working is that the spring switch key 20 is away from the torsion spring driving shaft 4 during timing, and when the timing is completed, the spring switch key 20 suddenly falls into the gap of the timing disk 5 and the positioning disk 6 to move in the direction of the torsion spring driving shaft 4 and push the power arm 2B to rotate the hammer head 2C to hit the inner wall of the bell 1 to issue a ringing reminder, and when the timing is reversed, the spring switch key 20 slides out of the gap of the timing disk and the positioning disk, and the elastic force of the spring wire 3 restores the position of the hammer 2 to allow the power arm 2B to press the spring switch key 20 all the time. The sheet-shaped fixed shaft of the bell hammer is punched out of the top wall of the cover, and it is quickly processed in one piece, and the rough processing and assembly can meet the use requirements and reduce costs.
[0023] like Fig. 9As shown, the torsion spring driving shaft 4 of the mechanical timer includes a head section shaft 4A of a rotating handle, a rotating middle section shaft 4B, a tail section shaft 4C of a first step, and a tail section shaft 4D of a second step. The head section shaft 4A is a combination of an arc surface 4A1 and a plane 4A2, the middle section shaft 4B is cylindrical, an arc surface 4A1 of the head section shaft 4A is consistent with the surface of the middle section shaft 4B, the surface of the tail section shaft 4C of the first step is lower than the surface of the middle section shaft 4B, the surface of the tail section shaft 4D of the second step is lower than the surface of the tail section shaft 4C of the first step, the arc surfaces 4C1 on both sides of the tail section shaft 4C of the first step are separated from the planes 4C2 on both sides, the arc surfaces 4D1 on both sides of the tail section shaft 4D of the second step are separated from the planes 4D2 on both sides, and the arc surface 4C1 on one side of the tail section shaft of the first step and the arc surface 4D1 on one side of the tail section shaft of the second step are on the same side as a plane 4A2 of the head section shaft. The arc surface 4C1 on one side of the tail section shaft of the first step and the arc surface 4D1 on one side of the tail section shaft of the second step are on the same side as the plane 4A2 of the head section shaft, which is convenient for aligning the notches of the timing disk and the positioning disk on the same side, estimating the torsion angle timing and reducing calibration operations during assembly. The diameter of the tail section shaft 4C of the first step is slightly larger than the diameter of the shaft hole 8A of the torsion spring driving shaft of the upper clamping plate 8. The tail section shaft 4C of the first step is installed with a torsion spring 10, a driving gear 9, and a driving gear pressing plate 19 for stretching the hole wall. The tail section shaft 4D of the second step can be long or short. The long one passes through the cover shell to install a bell at the tail. The one without a bell does not need to pass through the cover shell. The tail section shaft 4D of the second step is installed with a timing disk 5 and a positioning disk 6. There can be a conical transition 4A3 between a plane 4A2 of the head section shaft and the bottom of the middle section shaft 4B, which is convenient for the smooth torsion spring driving shaft 4 of such a structure to be easily demolded by the mold cold heading process. There is a jam during demolding at 90°C between a plane 4A2 of the head section shaft and the bottom of the middle section shaft 4B. The arc surfaces on both sides of the two steps are separated from the planes on both sides, so it is no longer necessary to drill holes and pins on the tail section shaft to twist the integrated timing disk and positioning disk of the plastic. The shaft holes of the driving gear and the shaft holes of the timing disk can be twisted or rotated together with the arc surfaces on both sides of the two steps and the planes on both sides of the tail section shaft, which reduces the trouble of process and installation. Three steps can also be set, or a design with multiple arc surfaces separated from multiple planes can be used, depending on the requirements.
[0024] like Fig.10 As shown, the bell 1, the bell shell and the inner center of the bell are provided with a groove 1A corresponding to the tail of the tail section shaft. The groove 1A can be a groove separated by two arc surfaces and two planes. Such a groove needs to be assembled to the tail of the torsion spring driving shaft 4 in one more action in the direction during automatic assembly. It can also be set as a cylindrical groove, which can be easily and quickly assembled to the torsion spring driving shaft 4 without dividing the direction. The bell 1 is cold-welded on the outside and fixed to the tail of the torsion spring driving shaft 4. The bell-beating structure includes a bell 1, a hammer 2, a spring wire 3, and a fixed shaft 7C. The bell 1 is formed by continuous die stamping.
[0025] like Figure 8 It is the cover 7, Fig.10 The internal structure of the bell. Fig.12 It is the structure of the upper plate top of the cover. Fig.13 This is an exploded view of the shell. Fig.14 The whole bell mechanical timer is shown, and the bell mechanical timer includes a bell 1, a hammer 2, a spring wire 3, a torsion spring driving shaft 4, a timing plate 5, a positioning plate 6, a cover 7, an upper clamping plate 8, a driving gear 9, a torsion spring 10, a first driven gear 11, a second driven gear 12, a third driven gear 13, a ratchet 14, a notched deceleration chuck 15, a swing weight plate 16, a flat pin 17, a lower clamping plate 18, a driving gear pressing plate 19, a spring switch key 20, a spring 21, and an installation connecting frame 22. The core of the mechanical timer can be a core including a notched deceleration chuck 15 and an existing stepped pin, or a core including a notched deceleration chuck 15 and a flat pin 17, upper and lower clamping plates 8 and 18 of a groove, or a core including a notched deceleration chuck 15, a flat pin 17, upper and lower clamping plates 8 and 18 of a groove, and a torsion spring driving shaft 4 separated by two arc surfaces of two steps and two planes.
[0026] The assembly process is as follows: The torsion spring driving shaft 4 is fixed on the fixture and adjusted to the size and position of a plane 4A2 of the head section shaft 4A. It should be noted that the plane 4A2 of the head section shaft 4A is located on the same side as the spring switch key 20, the notch of the timing disk 5, and the notch of the positioning disk 6, and then installed into the mounting connecting frame 22. The lower clamping plate 18 is located on the mounting connecting frame 22, and the mounting connecting frame 22 has a bayonet connected to the cover 7. The lower clamping plate 18 is located on the mounting connecting frame 22, and only the movement of the semi-finished mechanical timer is needed, and the mounting connecting frame 22 does not need to be assembled.
[0027] The lower clamping plate 18 is installed into the torsion spring driving shaft 10 through the shaft hole, and the torsion spring 10 is inserted into the tail shaft 4C of the first step of the torsion spring driving shaft 4 and is placed between the receiving buckle 18G of the lower clamping plate 18 and the torsion spring connecting buckle 18H. The outer head of the torsion spring 10 is connected or cold-welded to the torsion spring connecting buckle 18H, and the inner head of the torsion spring 10 is cold-welded (resistance-welded) to the tail shaft 4C of the first step of the torsion spring driving shaft 4. The driving gear 9 of the round shaft hole is installed into the torsion spring driving shaft 4 to press the torsion spring 10. The driving gear 9 of the round shaft hole does not need to be installed in different directions, and the driving gear clamping plate 19 of the stretching shaft hole wall corresponding to the tail shaft 4C of the first step is inserted, and the driving gear clamping plate 19 is cold-welded to the tail shaft 4C of the first step of the torsion spring driving shaft 4 and the driving gear 9 to prevent the torsion spring driving shaft 4 from loosening forward as a whole.
[0028] The large gear is connected to the small gear for transmission. The one pressed down is installed first, and the one on top is installed later. The flat pin shaft 17 is inserted into the corresponding groove. The ratchet 14 and the first driven gear 11 are installed to the corresponding groove positions first, with the small gear 14B of the ratchet 14 facing upward and the small gear of the first driven gear 11 facing downward; then the second driven gear 12 is installed, with the small gear of the second driven gear 12 facing downward; finally, the third driven gear 13 is installed, with the small gear of the third driven gear 13 facing downward, and the third driven gear 13 presses the second driven gear 12 and the ratchet 14, and the notched reduction chuck 15 is installed downward into the swing weight plate 16, and the swing weight plate 16 presses the ratchet 14, and the notch 15A of the notched reduction chuck 15 contacts the teeth of the large gear 14A of the ratchet 14. The transmission process is: the driving gear 9 closes the small gear of the first driven gear 11, the large gear of the first driven gear 11 closes the small gear of the second driven gear 12, the large gear of the second driven gear 12 closes the small gear of the third driven gear 13, the large gear of the third driven gear 13 closes the small gear 14B of the ratchet 14, and the teeth of the large gear 14A of the ratchet contact the notch 15A of the notch reduction chuck.
[0029] like Fig.12 As shown, the hole 8H of the upper clamping plate 8 is equipped with a spring 21 that allows the first driven gear 11 to move back and forth. The upper clamping plate 8 is inserted into the tail section shaft 4D of the second step of the torsion spring driving shaft 4 through the shaft hole, and the positions of the strip groove, the round groove and the flat head pin shaft 17 are matched. The buckle under the side plate of the upper clamping plate 8 is connected to the bayonet of the lower clamping plate 18, and the movement is installed.
[0030] The spring switch key 20 is installed on the buckle 8I on the side of the side plate of the upper clamping plate 8.
[0031] The fixed shaft 7C on the cover 7 is pre-installed with the hammer 2 and the spring wire 3. The cover 7 is inserted into the tail shaft 4D of the second step of the torsion spring driving shaft 4 through the shaft hole, and the spring switch key 20 extends out of the switch key through hole 7B on the cover, and the power arm 2B of the hammer presses the spring switch key 20. The cover 7 covers the entire movement, and the buckle at the lower side of the side wall of the cover 7 is connected and installed to the bayonet of the lower clamping plate 18.
[0032] The notch of the positioning plate 6 of the circular shaft hole faces a plane 4A1 of the head shaft 4A and is installed into the tail shaft 4D of the second step of the torsion spring driving shaft. It does not need to be installed in different directions. The notch of the timing plate 5 of the stretching shaft hole wall corresponding to the tail shaft 4D of the second step faces a plane 4A1 of the head shaft 4A and is installed into the tail shaft 4D of the second step. This timing plate 5 is twisted and timed to bear force and needs to be installed in different directions. Fig.12 As shown, the error correction buckle 5C of the timer 5 falls into the error correction buckle hole 6C of the positioning plate 6, and the stretching shaft hole wall 5A of the timing plate 5 is cold welded to the tail section shaft 4D of the second step.
[0033] The cylindrical groove 1A inside the bell 1 is installed to the tail section shaft 4D of the second step of the torsion spring driving shaft 4 to cover the hammer 2. It does not need to be installed in different directions. The cold-welded bell 1 is fixed to the tail section shaft 4D of the second step.
[0034] Finally, the rotating handle can be installed or not. The entire bell mechanical timer is assembled.
[0035] Smaller parts, not as small as the pin swing shaft, such as the hammer 2, spring wire 3, spring 21, can be pre-installed on other parts manually or automatically. The fixture clamps the torsion spring driving shaft 4 as the main forward line, and other parts are fed and assembled in turn by the fixture manipulators on the left and right sides of the main forward line, and a cold welding gun is set in the welding step. Replace with a centimeter-level notched reduction chuck 15, a flat-headed pin shaft 17 and the upper and lower clamps 8 and 18 of the groove, a smooth and flat two-step torsion spring driving shaft 4 without drilling and pinning, a cover 7 of the fixed shaft 7C of the hammer 2 that punches out the bell 1, and a bell 1 with a cylindrical groove, reduce the process, simplify the processing, reduce the assembly accuracy requirements, improve the structure of the parts, improve the structure of the finished product, and straighten out the assembly steps, so that extensive processing and installation can meet the use requirements, laying the foundation for realizing more automated assembly.
Claims
1. The flat pin of the mechanical timer, including the pin of the driven gear between the upper and lower clamping plates, the pin of the ratchet wheel, and the pin of the swing weight plate, is characterized by: The pins at both ends of the pin shaft are consistent in size with the main shaft, and the top of the pin shaft is flat.
2. The flat pin of the mechanical timer according to claim 1, characterized in that: There is a 90° transition between the pin shaft top plane and the pin shaft surface.
3. The flat pin of the mechanical timer according to claim 1, characterized in that: There is a chamfer transition between the pin shaft top plane and the pin shaft surface.
4. The flat pin of the mechanical timer according to claim 1, characterized in that: There is an inclined transition between the pin shaft top plane and the pin shaft surface.
5. The groove upper and lower clamps of the mechanical timer, including the upper and lower clamps, the shaft hole of the torsion spring driving shaft of the upper and lower clamps, characterized in that: Around the axial hole of the upper and lower clamping plates, there are sequentially arranged a first strip groove close to the axial hole at one end of the flat-headed pin shaft of the first driven gear corresponding to the driven gear of the mechanical timer described in claim 1, 2, 3 or 4, a second circular groove corresponding to the flat-headed pin shaft of the second driven gear, a third circular groove corresponding to the flat-headed pin shaft of the third driven gear, a fourth circular groove corresponding to the flat-headed pin shaft of the ratchet, and a fifth circular groove corresponding to the flat-headed pin shaft of the swing weight plate.
6. The groove upper and lower clamps of the mechanical timer, including the upper and lower clamps, the shaft hole of the torsion spring driving shaft of the upper and lower clamps, characterized in that: A first strip groove corresponding to one end of the flat-head pin shaft of the first driven gear of the mechanical timer described in claim 1, 2, 3 or 4, close to the shaft hole, a second circular groove corresponding to the flat-head pin shaft of the second driven gear, a third circular groove corresponding to the flat-head pin shaft of the ratchet, and a fourth circular groove corresponding to the flat-head pin shaft of the swing weight plate are sequentially arranged around the shaft hole of the upper and lower clamping plates.