Segmented stamping die for stator

Abstract

The invention provides a stator segmented stamping die, and relates to the technical field of stamping dies, the stator segmented stamping die comprises an abutting pressing plate, the side face of the abutting pressing plate is provided with an abutting guide column, the abutting guide column penetrates through an upper die plate and is inserted into an upper die base, and an upper die assembly has the automatic adaptation capability to the thickness of a material plate during machining; on the premise that the stroke lower limit of a stamping execution component is not adjusted, the operation of self-adaptive stamping machining of material plates with different thicknesses can be achieved, and the situations that rigid extrusion is formed between the material plates and a die component, the stamping stroke is insufficient or blanking is not thorough and the like are avoided; according to the stamping die, continuous batch production of stator segmented stamped sheets of different specifications can be supported, and the problems that an existing stamping die does not have the capacity of automatically adapting to the thickness of material plates, stroke lower limit parameters of a stamping execution component need to be manually adjusted and controlled for the material plates of different thicknesses, and the machining requirements of the stator segmented stamping process are difficult to meet are solved.

Description

Technical Field

[0001] This invention relates to the field of stamping die technology, and in particular to a stator segment stamping die. Background Technology

[0002] Stamping dies are process equipment that use the pressure of a press to plastically deform or separate metal sheets, thereby obtaining workpieces of specific shapes and sizes. Their core working parts can perform operations such as blanking and bending of blanks according to processing requirements. The stator laminations used in the stator core need to be batch processed with the help of stamping dies. When the stator laminations adopt a segmented stamping process, different materials can be selected for different segment areas. After the stator laminations of different materials are spliced ​​and combined, the magnetic conductivity and loss parameters of the stator can be effectively optimized, thereby improving the operating efficiency and working stability of the motor and meeting the high-performance application requirements of the motor in different scenarios.

[0003] Existing stator segment stamping dies lack automatic adaptation to material thickness. For materials of different thicknesses, the lower limit of the stroke of the stamping actuator must be manually adjusted. If not adjusted in time, when the material thickness increases, the lower limit of the upper die's stroke will exceed the actual placement height of the material, causing the upper die to descend excessively. This results in hard compression between the material and the die components, leading to material deformation or die edge chipping. Conversely, when the material thickness decreases, insufficient stamping stroke or incomplete blanking may occur. This manual parameter adjustment method is not only unstable but also difficult to adapt to the processing requirements of "different materials or different thicknesses of material in different segment areas" in stator segment stamping. It cannot support efficient mass production of stator laminations, has poor flexibility, and is not very practical. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a stator segment stamping die to solve the problems mentioned in the background section.

[0005] This invention provides a stator segment stamping die, specifically including a lower die assembly and an upper die assembly. The lower die assembly includes a lower die base and a lower template, with the lower template fixedly installed on the top of the lower die base. The upper die assembly includes an upper die base, a drive base, an upper template, and a clamping plate. The drive base is inserted into the top of the upper die base, and the upper template is fixedly installed at the bottom of the upper die base. The top of the drive base is fixedly connected to the bottom of a stamping execution component. The side of the lower die base is provided with stamping guide posts, which are inserted into the interior of the upper die base. The top of the clamping plate is provided with abutment guide posts, which pass through the upper template and are inserted into the interior of the upper die base.

[0006] Furthermore, the upper mold base is provided with a control groove inside, and the drive seat is inside the control groove. The top of the control groove is provided with a reset block, which is located above the drive seat body.

[0007] Furthermore, the upper die assembly also includes a stamping transmission seat, which is inserted into the interior of the upper die seat, and a rigid connecting block is provided on the side of the stamping transmission seat. When the upper die assembly is in the upper limit position, the rigid connecting block is located below the drive seat body.

[0008] Furthermore, the bottom of the upper template is provided with a stamping punch, and the inside of the pressing plate is provided with a relief groove for the stamping punch to pass through. The inside of the lower template is provided with a stamping die, and the inside of the lower die base is provided with a discharge channel for the material inside the stamping die to be discharged.

[0009] Furthermore, the stamping guide post is provided with a positioning tension spring on its exterior, and the two ends of the positioning tension spring are respectively fixedly connected to the top of the lower die base and the bottom of the upper die base.

[0010] Furthermore, the top of the abutting guide post is provided with an abutting top spring, and the two ends of the abutting top spring abut against the top of the abutting guide post and the inside of the upper mold base, respectively. The elastic force of the positioning tension spring is greater than the elastic force of the abutting top spring.

[0011] Furthermore, the stamping transmission seat has an adapter groove inside, and a control rod is provided on the side that abuts the guide post, with the control rod inserted into the adapter groove.

[0012] Furthermore, the adapter groove consists of a stamping guide groove arranged along the stamping direction and an adapter separation groove arranged at an inclination, with the bottom end of the adapter separation groove connected to the top end of the stamping guide groove.

[0013] Furthermore, when the upper die assembly is in the upper limit use position, the control rod is located at the bottom of the stamping guide groove, and the rigid connecting block protrudes from the interior of the upper die base and is located inside the control groove.

[0014] This invention provides a stator segment stamping die, which, compared with the prior art, has the following advantages: The upper die assembly can move up and down following the stamping actuator. Through the cooperation of the upper and lower die assemblies, the material sheet placed on the lower die assembly can be stamped. It is convenient and flexible to use. The upper die assembly has the ability to automatically adapt to the thickness of the material sheet during processing. By automatically controlling the triggering time of the drive seat no-load stroke through the upper die assembly, it can achieve adaptive stamping of material sheets of different thicknesses without adjusting the lower limit of the stroke of the stamping actuator. It will not cause hard extrusion between the material sheet and the die assembly, insufficient stamping stroke, or incomplete blanking, thus ensuring the stability and efficiency of the stator lamination processing. It can support the continuous batch production of stator segment laminations of different specifications, and has extremely high flexibility, adaptability and practicality. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0016] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0017] In the attached diagram: Figure 1 A schematic diagram of the structure of the present invention is shown.

[0018] Figure 2 A schematic diagram of the internal structure of the present invention is shown.

[0019] Figure 3 It shows Figure 2 Enlarged structural diagram of part A in the middle.

[0020] Figure 4 A schematic diagram of the disassembled upper mold assembly of the present invention is shown.

[0021] Figure 5 A schematic diagram of the disassembled lower mold assembly of the present invention is shown.

[0022] Figure 6 This diagram illustrates the internal structure of the present invention during the stamping process of thin sheet materials.

[0023] Figure 7 It shows Figure 6 A schematic diagram of the internal structure when the central drive seat moves downward to perform the stamping action.

[0024] Figure 8 It shows Figure 7 A schematic diagram of the internal structure of the drive unit at the moment of triggering the no-load stroke.

[0025] Figure 9 It shows Figure 8 Enlarged structural diagram of part B in the middle.

[0026] Figure 10 This diagram illustrates the internal structure of the present invention during the stamping process of thicker sheet materials.

[0027] Figure 11 It shows Figure 10 A schematic diagram of the internal structure when the central drive seat moves downward to perform the stamping action.

[0028] Figure 12 It shows Figure 11 A schematic diagram of the internal structure of the drive unit at the moment of triggering the no-load stroke.

[0029] Figure 13 It shows Figure 12 A schematic diagram of the internal structure of the drive unit during its no-load stroke.

[0030] Figure 14 It shows Figure 13 Enlarged structural diagram of part C in the middle.

[0031] List of reference numerals in the attached diagram. 1. Lower die assembly; 101. Lower die base; 1011. Stamping guide post; 1012. Material discharge channel; 1013. Positioning tension spring; 102. Lower die plate; 1021. Stamping die; 2. Upper mold assembly; 201. Upper mold base; 2011. Control groove; 2012. Reset block; 202. Drive base; 203. Upper template; 2031. Stamping punch; 204. Pressing plate; 2041. Abutment guide post; 2042. Clearance groove; 2043. Abutment top spring; 2044. Control rod; 205. Stamping transmission base; 2051. Rigid connecting block; 2052. Stamping guide groove; 2053. Adaptive separation groove.

[0032] It should be noted that the black straight arrows in the attached diagram indicate the direction of movement of the drive unit. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please refer to Figures 1 to 14 Example 1: This invention proposes a stator segment stamping die, including a lower die assembly 1 and an upper die assembly 2. The lower die assembly 1 includes a lower die base 101 and a lower template 102, with the lower template 102 fixedly installed on the top of the lower die base 101. The upper die assembly 2 includes an upper die base 201, a drive base 202, an upper template 203, and a pressing plate 204. The drive base 202 is inserted into the top of the upper die base 201, and the upper template 203 is fixedly installed on the bottom of the upper die base 201. The top of the drive base 202 is fixedly connected to the bottom of the stamping execution component. The side of the lower die base 101 is provided with a stamping guide post 1011, which is inserted into the interior of the upper die base 201. The top of the pressing plate 204 is provided with an abutment guide post 2041, which passes through the upper template 203 and is inserted into the interior of the upper die base 201. The upper die assembly 2 also includes a stamping transmission seat 205, which is inserted into the interior of the upper die seat 201. The side of the stamping transmission seat 205 is provided with a rigid connecting block 2051. When the upper die assembly 2 is in the upper limit position, the rigid connecting block 2051 is located below the drive seat 202.

[0035] The upper die holder 201 has a control groove 2011 inside, and the drive seat 202 is inside the control groove 2011. The top of the control groove 2011 has a reset block 2012, which is located above the drive seat 202. In use, the stamping actuator can drive the upper die assembly 2 to move up and down, thereby realizing the stamping of the stator lamination and the die reset operation. When the material sheet is placed on the top of the lower die holder 102, the stamping operation can begin. The stamping guide post 1011 has a positioning tension spring 1013 on its outside, and the two ends of the positioning tension spring 1013 are fixedly connected to the top of the lower die holder 101 and the bottom of the upper die holder 201, respectively. The top of the abutment guide post 2041 has an abutment top spring 2043, and the two ends of the abutment top spring 2043 abut against the top of the abutment guide post 2041 and the inside of the upper die holder 201, respectively. The elastic force of the positioning tension spring 1013 is greater than that of the abutment top spring 2043. The elastic force of 043 causes the stamping actuator to move the drive seat 202 downwards, which is the first preparatory action. At this time, since the clamping plate 204 and the stamping punch 2031 are not in contact with the material sheet, the clamping plate 204 and the upper die seat 201 can move downwards synchronously with the drive seat 202 under the action of the contact top spring 2043 and the positioning tension spring 1013. Under the blocking action of the reset block 2012 on the top of the drive seat 202, the drive seat 202 will not come out of the control groove 2011. After that, the clamping plate 204 will first press against the surface of the material sheet to perform a pressing operation on the material sheet. Under the blocking action of the material sheet, the clamping plate 204 will not continue to move downwards with the upper die seat 201. After that, the upper die seat 201 continues to move downwards until the stamping punch 2031 also presses against the surface of the material sheet. Only then will the upper die assembly 2 trigger the stamping operation to realize the stamping operation of the stator lamination.

[0036] The upper template 203 has a stamping punch 2031 at its bottom, and the pressure plate 204 has a relief groove 2042 for the stamping punch 2031 to pass through. The lower template 102 has a stamping die 1021 inside, and the lower die base 101 has a discharge channel 1012 for the material inside the stamping die 1021 to be discharged. In use, when the stamping punch 2031 also abuts against the surface of the material sheet, the tension of the positioning spring 1013 is insufficient to achieve the pressure required for the stamping of the upper die assembly 2 due to the obstruction of the material sheet. Therefore, the upper die assembly 2 then obtains pressure through the stamping actuator to achieve the downward movement and stamping operation. Since the upper die base 201 and the lower template 203 at its bottom will not continue to move downward under the action of the positioning spring 1013 after the stamping punch 2031 abuts against the surface of the material sheet, the drive seat 202 will then move downward. The pressure of the stamping actuator can be transmitted to the upper die base 201 by the rigid contact block 2051 at the bottom of its base. Finally, the upper die base 201 and the upper die plate 203 continue to move downward by the pressure of the stamping actuator to realize the stamping operation of the material sheet. During this process, the stamping punch 2031 passes through the relief groove 2042 and performs the stamping operation on the material sheet by pressure to complete the stamping operation of the stator lamination. The stamped material (scrap) can be discharged through the stamping die 1021 and the discharge channel 1012. It is stable in use. After a single stamping is completed, the upper die assembly 2 can be reset by the drive base 202 being moved upward by the stamping actuator. When the drive base 202 moves upward, it can lift and reset the upper die assembly 2 as a whole by contacting the reset block 2012 at the top of its base, so as to continue the stamping operation of the stator lamination. The operation is convenient and flexible.

[0037] The stamping transmission base 205 has an internal fitting groove, and a control rod 2044 is provided on the side of the guide post 2041. The control rod 2044 is inserted into the fitting groove, which consists of a stamping guide groove 2052 arranged along the stamping direction and an inclined fitting separation groove 2053. The bottom end of the fitting separation groove 2053 is connected to the top end of the stamping guide groove 2052. When the upper die assembly 2 is in the upper limit position, the control rod 2044 is located at the bottom of the stamping guide groove 2052, and the rigid connecting block 2051 protrudes from the interior of the upper die base 201 and is located inside the control groove 2011. In use, the upper die assembly 2 has the ability to automatically adapt to the thickness of the material sheet during processing, avoiding the need for traditional stamping dies to adjust according to the material sheet thickness. The thickness adjustment of the sheet metal is achieved by adjusting the lower limit of the stroke of the stamping actuator. During the stamping process, because the clamping plate 204 cannot move downward with the upper die holder 201, the abutment guide post 2041 moves upward inside the upper die holder 201 and compresses the abutment top spring 2043. As the abutment guide post 2041 moves upward inside the upper die holder 201, the control rod 2044 moves from the stamping guide groove 2052 into the fitting separation groove 2053, thereby realizing the automatic adaptation capability of the upper die assembly 2 to the thickness of the sheet metal. When the control rod 2044 moves inside the stamping guide groove 2052, the lateral position of the stamping transmission seat 205 does not change, so the drive seat 202 can stably pass through its seat bottom. The rigid connecting block 2051 drives the upper template 203 to move downward to achieve the stamping action. As the upper die holder 201 and the upper template 203 move downward, the control rod 2044 enters the interior of the matching separation groove 2053. Under the guiding action of the matching separation groove 2053 and the control rod 2044, the stamping transmission seat 205 retracts into the interior of the upper die holder 201, causing the rigid connecting block 2051 to lose its rigid contact transmission relationship with the bottom of the drive seat 202. Therefore, the drive seat 202 will then move downward independently within the control groove 2011 for an unloaded stroke, without driving the upper die holder 201 and the upper template 203 to continue moving downward to apply pressure. Based on the above characteristics, when the drive seat 202 triggers the unloaded stroke, the upper template 203... The distance between the upper die plate 203 and the clamping plate 204 is a fixed value. That is, when the distance between the upper die plate 203 and the clamping plate 204 reaches the distance at which the drive seat 202 triggers its no-load stroke, the drive seat 202 will not continue to apply stamping pressure to the upper die base 201 and the upper die plate 203. Therefore, regardless of the thickness of the material sheet being stamped, the clamping plate 204 will first contact the material sheet. Subsequently, during the stamping operation, the distance between the upper die plate 203 and the clamping plate 204 continuously decreases. When the distance between the upper die plate 203 and the clamping plate 204 reaches the distance at which the drive seat 202 triggers its no-load stroke, the drive seat 202 will enter its no-load stroke, avoiding excessive compression of the material sheet or the die itself. In other words...Because the maximum downward position of the drive seat 202 is fixed through the stamping actuator, when stamping thicker sheet materials, the contact between the clamping plate 204 and the sheet material occurs earlier, resulting in a larger no-load stroke of the drive seat 202. Conversely, when stamping thinner sheet materials, the contact between the clamping plate 204 and the sheet material occurs later, resulting in a smaller no-load stroke of the drive seat 202. Furthermore, the stamping guide groove 2052 ensures that the upper die 203 always has an effective downward stamping stroke, preventing insufficient stamping stroke and incomplete blanking. This results in stable operation and rapid processing.

[0038] The specific usage and function of this embodiment: In this invention, the stamping actuator can drive the upper die assembly 2 to move up and down, thereby realizing the stamping processing of stator laminations and the operation of die reset. When the material sheet is placed on the top of the lower die plate 102, the stamping operation can begin. The stamping actuator drives the drive seat 202 to move down first as a preparatory action. At this time, since the pressing plate 204 and the stamping punch 2031 are not in contact with the material sheet, under the action of the top spring 2043 and the positioning tension spring 1013, the pressing plate 204 and the upper die seat 201 can move down synchronously with the drive seat 202. And under the blocking action of the reset block 2012 on the top of the drive seat 202, the drive seat 202 will not come out of the control groove 2011. Internally, the clamping plate 204 first presses against the surface of the material sheet to clamp it. Due to the obstruction of the material sheet, the clamping plate 204 will not continue to move downwards with the upper die holder 201. The upper die holder 201 then continues to move downwards until the stamping punch 2031 also presses against the surface of the material sheet. Only then will the upper die assembly 2 trigger the stamping operation to realize the stamping operation of the stator lamination. When the stamping punch 2031 also presses against the surface of the material sheet, the tension of the positioning spring 1013 is insufficient to achieve the pressure required for the stamping operation of the upper die assembly 2 due to the obstruction of the material sheet. Therefore, the upper die assembly 2 then obtains pressure through the stamping actuator to achieve the downward movement and stamping operation. Because of the stamping... After the punch 2031 abuts against the surface of the material sheet, the upper die holder 201 and its bottom upper template 203 will not continue to move downward under the action of the positioning tension spring 1013. Therefore, when the drive seat 202 moves downward, it can transmit the pressure of the stamping actuator to the upper die holder 201 by rigidly abutting against the rigid connecting block 2051 at the bottom of its seat. Finally, the upper die holder 201 and the upper template 203 continue to move downward under the pressure of the stamping actuator to achieve the stamping operation on the material sheet. During this process, the stamping punch 2031 passes through the relief groove 2042 and performs a stamping operation on the material sheet through pressure, completing the stamping operation of the stator lamination. The stamped material (scrap) can be discharged through the stamping die 1021 and the discharge channel 1012. The system is stable in use. After a single stamping operation, the upper die assembly 2 is reset by moving the drive seat 202 upward through the stamping actuator. When the drive seat 202 moves upward, it can lift and reset the entire upper die assembly 2 by abutting the reset block 2012 at the top of its seat body, so as to prepare for subsequent stamping of stator laminations. The upper die assembly 2 has the ability to automatically adapt to the thickness of the material sheet during processing, avoiding the need for traditional stamping dies to adjust the lower limit of the stroke of the stamping actuator according to the thickness of the material sheet. During the stamping operation, since the clamping plate 204 cannot move downward with the upper die seat 201, the abutting guide post 2041 will move upward inside the upper die seat 201 and compress the abutting top spring 2043.As the guide post 2041 moves upward within the upper die holder 201, the control rod 2044 enters the fitting separation groove 2053 from the stamping guide groove 2052, thus enabling the upper die assembly 2 to automatically adapt to the thickness of the material sheet. While the control rod 2044 moves within the stamping guide groove 2052, the lateral position of the stamping transmission seat 205 remains unchanged. This allows the drive seat 202 to stably drive the upper die plate 203 downward via the rigid contact block 2051 at the bottom of its seat, achieving the stamping action. As the upper die holder 201 and the upper die plate 203 move downward, the control rod 2044... The material will enter the interior of the adaptation separation groove 2053. Under the guiding action of the adaptation separation groove 2053 and the control rod 2044, the stamping transmission seat 205 will retract into the upper die seat 201. This causes the rigid connecting block 2051 to lose its rigid contact transmission relationship with the bottom of the drive seat 202. Consequently, the drive seat 202 will then move downwards independently within the control groove 2011 for an unloaded stroke, without driving the upper die seat 201 and upper template 203 to continue moving downwards to apply pressure. Based on these characteristics, when the drive seat 202 triggers the unloaded stroke, the distance between the upper template 203 and the pressing plate 204 is a fixed value. When the distance between the upper die plate 203 and the clamping plate 204 reaches the distance at which the drive seat 202 triggers its no-load stroke, the drive seat 202 will not continue to apply stamping pressure to the upper die holder 201 and the upper die plate 203. Therefore, regardless of the thickness of the material being stamped, the clamping plate 204 will be the first to contact the material. Subsequently, during the stamping operation, the distance between the upper die plate 203 and the clamping plate 204 continuously decreases. When the distance between the upper die plate 203 and the clamping plate 204 reaches the distance at which the drive seat 202 triggers its no-load stroke, the drive seat 202 will enter its no-load stroke, preventing damage to the material. The excessive compression caused by the sheet metal or mold itself means that, because the maximum downward position of the drive seat 202 is fixed through the stamping actuator, when stamping thicker sheet metal, the contact between the clamping plate 204 and the sheet metal is earlier, resulting in a larger no-load stroke of the drive seat 202. Conversely, when stamping thinner sheet metal, the contact between the clamping plate 204 and the sheet metal is later, resulting in a smaller no-load stroke of the drive seat 202. Furthermore, the stamping guide groove 2052 ensures that the upper die plate 203 always has an effective downward stamping stroke, preventing insufficient stamping stroke and incomplete blanking.

Claims

1. A stator segment stamping die, comprising a lower die assembly (1) and an upper die assembly (2), wherein the lower die assembly (1) includes a lower die base (101) and a lower die template (102), characterized in that, The lower template (102) is fixedly installed on the top of the lower mold base (101); the upper mold assembly (2) includes an upper mold base (201), a drive base (202), an upper template (203), and a pressing plate (204). The drive base (202) is inserted into the top of the upper mold base (201), and the upper template (203) is fixedly installed at the bottom of the upper mold base (201). The top of the drive base (202) is fixedly connected to the bottom of the stamping execution component. The side of the lower mold base (101) is provided with a stamping guide post (1011), and the stamping guide post (1011) is inserted into the interior of the upper mold base (201). The top of the pressing plate (204) is provided with an abutment guide post (2041), and the abutment guide post (2041) passes through the upper template (203) and is inserted into the interior of the upper mold base (201). The upper mold base (201) is provided with a control groove (2011) inside, and the drive base (202) is inside the control groove (2011). The top of the control groove (2011) is provided with a reset stop (2012), and the reset stop (2012) is located above the drive base (202). The upper die assembly (2) also includes a stamping transmission seat (205), which is inserted into the interior of the upper die seat (201). The side of the stamping transmission seat (205) is provided with a rigid connecting block (2051). When the upper die assembly (2) is in the upper limit position, the rigid connecting block (2051) is located below the drive seat (202). The stamping transmission seat (205) has an adapter groove inside, and a control rod (2044) is provided on the side of the guide post (2041), and the control rod (2044) is inserted into the adapter groove. The adapter groove consists of a stamping guide groove (2052) arranged along the stamping direction and an adapter separation groove (2053) arranged at an inclination. The bottom end of the adapter separation groove (2053) is connected to the top end of the stamping guide groove (2052). When the upper die assembly (2) is in the upper limit use position, the control rod (2044) is located at the bottom of the stamping guide groove (2052), and the block of the rigid connecting block (2051) protrudes from the interior of the upper die base (201) and is located inside the control groove (2011).

2. The stator segment stamping die according to claim 1, characterized in that, The bottom of the upper template (203) is provided with a stamping punch (2031), and the interior of the pressing plate (204) is provided with a relief groove (2042) for the stamping punch (2031) to pass through. The interior of the lower template (102) is provided with a stamping die (1021), and the interior of the lower die base (101) is provided with a discharge channel (1012) for the material inside the stamping die (1021) to be discharged.

3. The stator segment stamping die according to claim 2, characterized in that, The stamping guide post (1011) is provided with a positioning tension spring (1013) on its outside, and the two ends of the positioning tension spring (1013) are respectively fixedly connected to the top of the lower die base (101) and the bottom of the upper die base (201).

4. A stator segment stamping die according to claim 3, characterized in that, The top of the abutting guide post (2041) is provided with an abutting top spring (2043), and the two ends of the abutting top spring (2043) abut against the top of the abutting guide post (2041) and the inside of the upper mold base (201) respectively. The elastic force of the positioning tension spring (1013) is greater than the elastic force of the abutting top spring (2043).

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