Contact elastic sheet processing equipment of electric switch

Abstract

The utility model relates to the technical field of electric switches, and discloses an electric switch contact elastic sheet processing device, which comprises a processing table, a working table is fixedly connected above the processing table, and a clamping mechanism is arranged above the processing table. According to the processing equipment for the contact elastic sheet of the electric switch, the linear motion of the air cylinder is ingeniously converted into the rotation of the rotating shaft through the arrangement of the clamping mechanism and the transmission device, then the screw rod is driven to operate, the sliding table can stably and linearly move on the screw rod by virtue of the stabilizing effect of the spacer block, and the moving accuracy of the sliding table is guaranteed in cooperation with the guiding of the sliding groove of the base; the chuck is connected with the sliding table through the connecting rod and moves along with the sliding table to accurately place the elastic piece on the lower die, the lower die provides stable supporting and accurate positioning, it is ensured that the position of the elastic piece is fixed during machining, the collecting groove collects chippings in time, the working area is kept clean and tidy, chipping interference is avoided, and the machining efficiency is improved. And a solid foundation is laid for smooth development and high-quality output of elastic sheet processing in all directions, and the processing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical switch technology, specifically to a contact spring processing equipment for electrical switches. Background Technology

[0002] An electric switch is an electrical component used in circuits. Its main function is to control the opening and closing of circuits. In various electrical equipment and circuit systems, electric switches play a crucial role. When an electric switch is in the closed state, the circuit is completed, and current can flow smoothly, enabling connected electrical equipment to work normally, such as lighting fixtures turning on or motors starting to run. When an electric switch is in the open state, the circuit is cut off, current cannot flow, and electrical equipment stops working. In the modern electronics manufacturing field, the contact spring of an electric switch is a key component, and its processing quality directly affects the performance and reliability of the electric switch. An advanced and efficient processing equipment for electric switch contact springs has become a core element for improving production efficiency and product quality.

[0003] Traditionally, the processing of contact springs for electrical switches is done manually. Manual operation is limited by the skill level and fatigue level of workers, making it difficult to ensure the consistency of the size and shape of each spring. Deviations in spring size may affect its compatibility with other components of the electrical switch, reduce the performance stability of the electrical switch, increase the product defect rate, and waste raw materials and processing costs. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a contact spring processing equipment for electric switches, which has the functions of automatic clamping and automatic processing of contact springs for electric switches, thus solving the problem of reduced efficiency caused by manual operation in traditional technologies.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A contact spring processing device for an electrical switch includes a processing table with feet installed at the bottom and a collection box inside. A workbench is fixedly connected above the processing table, and a support is fixedly connected above the workbench. A controller is installed on the surface of the support. A clamping mechanism is provided above the processing table, and the clamping mechanism includes a transmission device and a clamping device. The clamping device clamps the workpiece under the action of the transmission device.

[0007] Preferably, the transmission device includes a cylinder, a connecting plate, a base, a slider, a slide rail, a rack, a ratchet, and a rotating shaft. The cylinder is connected to the top of the worktable, the output end of the cylinder is connected to the connecting plate, the base is connected to the surface of the connecting plate, the slider is connected to the bottom of the base, the slide rail is connected to the top of the worktable, a rack is installed inside the base, a ratchet is engaged on the surface of the rack, a rotating shaft is fixedly connected to one end of the ratchet, and a clamping device is provided at one end of the rotating shaft.

[0008] Preferably, the clamping device includes a fixed base, a screw, a spacer, a slide, a base, a slide groove, a connecting rod, a chuck, a fixing plate, a collecting groove, and a lower mold. The fixed base is connected to the top of the worktable. One end of the rotating shaft is connected to the screw. A spacer is installed in the middle part of the screw. The slide is threaded onto the surface of the screw. The base is connected to the top of the worktable. A slide groove is formed on the surface of the base. A connecting rod is connected to the top of the slide. A chuck is connected to the top of the connecting rod. The fixing plate is connected to the top of the fixed base. A collecting groove is formed in the middle part of the fixing plate. The lower mold is installed inside the collecting groove.

[0009] Preferably, the foot supports are provided in four identical sets at the bottom of the processing table, and are respectively located at the four corners of the bottom of the processing table.

[0010] Preferably, the base is driven by a slider via a slide rail and a rack and pinion transmission, and the outer wall size of the slider matches the inner wall size of the slide rail.

[0011] Preferably, the threads of the screw are symmetrically distributed around the central axis of the spacer, and the outer wall dimension of the bottom of the slide table matches the inner wall dimension of the slide groove.

[0012] Preferably, the device further includes a stamping mechanism, which comprises a hydraulic cylinder, a hydraulic rod, a stamping head, a support plate, a limiting plate, a first limiting groove, a second limiting groove, a limiting block, an auxiliary rod, a return spring, and an upper die. A hydraulic cylinder is mounted above the support frame. A hydraulic rod is slidably connected inside the hydraulic cylinder. A stamping head is connected to the bottom of the hydraulic rod. A support plate is connected to the surface of the stamping head. Limiting plates are connected to both ends of the support plate. A first limiting groove is formed on the inner side of the support frame. A second limiting groove is formed inside the support plate. A limiting block is slidably connected inside the second limiting groove. An auxiliary rod is connected to the bottom of the limiting block. A return spring is wound around the outer side of the auxiliary rod. An upper die is connected to the bottom of the stamping head.

[0013] Compared with the prior art, this utility model provides a contact spring processing equipment for electric switches, which has the following beneficial effects:

[0014] 1. The contact spring processing equipment for this electric switch, through the setting of the transmission device, the equipment starts processing the contact spring of the electric switch. The controller issues a command, the cylinder works, and its output end pushes the connecting plate. Since the connecting plate is connected to the base, the base moves accordingly. The slider at the bottom of the base slides smoothly in a straight line on the slide rail to avoid deviation. When the base moves, the internal rack moves synchronously. The rack meshes with the ratchet, converting the linear motion into the ratchet's circumferential motion. The ratchet drives the rotating shaft to rotate, and the clamping device connected to the other end of the rotating shaft operates accordingly. By precisely controlling the extension and retraction of the cylinder, adjusting the movement of the rack, and thus controlling the rotation of the ratchet, the position and angle of the clamping device can be precisely adjusted, stably and accurately clamping different springs, providing reliable positioning and fixing support for subsequent processing.

[0015] 2. The contact spring processing equipment for this electric switch, through the setting of the clamping device, when the transmission device drives the rotating shaft to rotate, the screw connected to it rotates synchronously. The spacer in the middle of the screw provides positioning and isolation, ensuring the stable and orderly movement of the slide table. The slide table moves linearly on the screw and slides in the base groove. The groove guides its movement to be precise and stable, without deviation or shaking. The slide table drives the chuck to move via the connecting rod. When it is necessary to clamp the spring, the chuck moves towards the fixed plate under the drive of the slide table, accurately placing the spring on the lower mold in the collection groove of the fixed plate. The lower mold supports and positions the spring. The collection groove collects debris, keeping the working area clean and preventing debris from scratching the spring or affecting accuracy, ensuring smooth processing and the quality of the spring. The entire clamping mechanism has an automatic clamping function for the contact spring of the electric switch, solving the problem of reduced efficiency caused by manual operation in traditional technology. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the transmission device of this utility model;

[0018] Figure 3 This is a schematic diagram of the clamping device of this utility model;

[0019] Figure 4 This is a schematic diagram of the stamping mechanism of this utility model.

[0020] The components include: 1. Processing table; 2. Foot support; 3. Collection box; 4. Workbench; 5. Support; 6. Controller; 7. Clamping mechanism; 701. Cylinder; 702. Connecting plate; 703. Base; 704. Slider; 705. Slide rail; 706. Rack; 707. Ratchet; 708. Rotating shaft; 709. Fixed seat; 710. Screw; 711. Spacer; 712. Slide table; 713. Base; 714. 715. Slide groove; 716. Connecting rod; 717. Clamp; 718. Fixing plate; 719. Collection groove; 710. Lower mold; 8. Stamping mechanism; 801. Hydraulic cylinder; 802. Hydraulic rod; 803. Stamping head; 804. Support plate; 805. Limiting plate; 806. First limiting groove; 807. Second limiting groove; 808. Limiting block; 809. Auxiliary rod; 810. Return spring; 811. Upper mold. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 A contact spring processing device for an electric switch includes a processing table 1, a foot support 2 installed at the bottom of the processing table 1, a collection box 3 provided inside the processing table 1, a workbench 4 fixedly connected above the processing table 1, a bracket 5 fixedly connected above the workbench 4, a controller 6 installed on the surface of the bracket 5, and a clamping mechanism 7 provided above the processing table 1. The clamping mechanism 7 includes a transmission device and a clamping device.

[0023] In this embodiment, the transmission device includes a cylinder 701, a connecting plate 702, a base 703, a slider 704, a slide rail 705, a rack 706, a ratchet 707, and a rotating shaft 708. The cylinder 701 is connected to the top of the worktable 4, the output end of the cylinder 701 is connected to the connecting plate 702, the surface of the connecting plate 702 is connected to the base 703, the bottom of the base 703 is connected to the slider 704, the top of the worktable 4 is connected to the slide rail 705, and a rack 708 is installed inside the base 703. 06. A ratchet 707 meshes with the surface of the rack 706. One end of the ratchet 707 is fixedly connected to a rotating shaft 708. One end of the rotating shaft 708 is equipped with a clamping device. Through the transmission device, when the equipment is started to process the contact spring of the electric switch, the controller 6 issues a command, and the cylinder 701 starts to work. The output end of the cylinder 701 pushes the connecting plate 702, causing it to move along the top of the worktable 4. Since the connecting plate 702 is connected to the base 703, the base 703 moves accordingly. At this time, the slider 704 at the bottom of the base 703 slides on the slide rail 705. This structural design ensures the stability and linearity of the movement of the base 703 and avoids deviation. As the base 703 moves, the rack 706 installed inside it also moves synchronously. Because the rack 706 meshes with the ratchet 707, the linear motion of the rack 706 is converted into the circular motion of the ratchet 707. The ratchet 707 is fixed to one end of the rotating shaft 708, so when the ratchet 707 rotates, it drives the rotating shaft 708 to rotate together. The other end of the rotating shaft 708 is connected to the clamping device. Therefore, the rotation of the rotating shaft 708 further drives the clamping device to operate. Through the extension and retraction control of the cylinder 701, the moving distance and speed of the rack 706 can be precisely adjusted, thereby controlling the rotation angle and speed of the ratchet 707. Finally, the position and angle of the clamping device can be precisely adjusted so that it can stably and accurately clamp electrical switch contact springs of different sizes and shapes, providing reliable positioning and fixing support for subsequent processing.

[0024] Furthermore, the clamping device includes a fixed base 709, a screw 710, a spacer 711, a slide 712, a base 713, a groove 714, a connecting rod 715, a chuck 716, a fixing plate 717, a collecting groove 718, and a lower mold 719. The fixed base 709 is connected to the top of the worktable 4. One end of the rotating shaft 708 is connected to the screw 710. A spacer 711 is installed in the middle of the screw 710. The slide 712 is threaded onto the surface of the screw 710. The base 713 is connected to the top of the worktable 4. A groove 714 is formed on the surface of the base 713. The slide 715... A connecting rod 715 is connected above the 2, and a chuck 716 is connected above the connecting rod 715. A fixing plate 717 is connected above the fixing base 709. A collection groove 718 is opened in the middle part of the fixing plate 717. The lower mold 719 is installed inside the collection groove 718. Due to the clamping device, when the transmission device drives the rotating shaft 708 to rotate, the screw 710 connected to one end of the rotating shaft 708 rotates synchronously. Since a spacer 711 is installed in the middle part of the screw 710, the spacer 711 plays a role in positioning and isolation, ensuring the movement of the slide table 712 on the screw 710. Stable and orderly, as the screw 710 rotates, the threaded slide 712 moves linearly along the screw 710. The slide 712 slides within a groove 714 on the surface of the base 713. The groove 714 guides the movement of the slide 712, ensuring its accuracy and stability and preventing deviation or wobbling. The slide 712 is connected to the chuck 716 via a connecting rod 715, so the linear movement of the slide 712 drives the connecting rod 715 and the chuck 716 to move together. When it is necessary to clamp the contact spring of the electric switch, the chuck 716 moves along the slide 710. Driven by 2, it moves towards the fixing plate 717 above the fixing base 709. The middle part of the fixing plate 717 has a collection groove 718. The lower mold 719 is installed inside the collection groove 718. The chuck 716 accurately places the contact spring on the lower mold 719. In the subsequent processing, the lower mold 719 plays a supporting and positioning role for the spring. The collection groove 718 is used to collect debris and other impurities generated during the processing, keep the working area clean, ensure the smooth progress of the processing and the processing quality of the spring, and avoid debris from scratching the surface of the spring or affecting the processing accuracy.

[0025] Furthermore, four identical sets of foot supports 2 are installed at the bottom of the processing table 1, located at the four corners of the bottom of the processing table 1. The foot supports 2 provide a stable support foundation for the entire processing equipment. The four sets of foot supports distributed at the four corners of the bottom of the processing table can evenly distribute the weight of the equipment itself and the pressure generated during processing, ensuring that the processing table remains stable during operation and avoiding the impact of shaking or tilting on the processing accuracy of the contact springs. At the same time, the foot supports can also be adjusted appropriately according to the actual ground conditions to adapt to different working environments, ensuring that the equipment is always in a horizontal and stable state, providing a reliable guarantee for high-quality processing and production.

[0026] Furthermore, the base 703 drives the rack 706 via the slider 704 and slide rail 705. The outer wall size of the slider 704 matches the inner wall size of the slide rail 705. Through the arrangement of the slider 704 and the slide rail 705, the precise guidance and smooth transmission of the base 703's movement are achieved. The close-fitting size design effectively reduces the gap when the slider 704 slides within the slide rail 705, avoiding wobbling or deviation. During the process of the cylinder 701 pushing the connecting plate 702 to move the base 703, the slider 704 can slide smoothly along the slide rail 705, thereby enabling the rack 706 to perform smooth linear motion, ensuring the accuracy and stability of the transmission, and providing reliable power transmission for the subsequent circular motion of the ratchet 707.

[0027] In addition, the threads of the screw 710 are symmetrically distributed around the central axis of the spacer 711, and the outer wall dimension of the bottom of the slide table 712 matches the inner wall dimension of the slide groove 714. Through the arrangement of the screw 710, slide table 712 and slide groove 714, the synchronous and precise movement of the chuck 716 is achieved. The symmetrically distributed threads of the screw 710 enable the slide tables 712 on both sides to move synchronously and relatively when the screw rotates, ensuring the symmetry and stability of the chuck 716 in clamping the contact spring of the electric switch. The bottom of the slide table 712 fits tightly with the slide groove 714, further restricting the movement trajectory of the slide table 712, so that it can only move in a straight line along the slide groove 714, avoiding rotation or offset of the slide table 712 during movement, ensuring that the chuck 716 can accurately place the contact spring on the lower mold 719, improving the accuracy and efficiency of the spring processing.

[0028] It is worth noting that the system also includes a stamping mechanism 8, which comprises a hydraulic cylinder 801, a hydraulic rod 802, a stamping head 803, a support plate 804, a limiting plate 805, a first limiting groove 806, a second limiting groove 807, a limiting block 808, an auxiliary rod 809, a return spring 810, and an upper die 811. The hydraulic cylinder 801 is mounted above the bracket 5. The hydraulic rod 802 is slidably connected inside the hydraulic cylinder 801. The bottom of the hydraulic rod 802 is connected to the stamping head 803. The surface of the stamping head 803 is connected to the support plate 804. Limiting plates 805 are connected to both ends of the support plate 804. A first limiting groove 806 is formed on the inner side of the bracket 5, and a second limiting groove 807 is formed inside the support plate 804. The internal sliding connection of the stamping mechanism 7 includes a limiting block 808. An auxiliary rod 809 is connected to the bottom of the limiting block 808, and a return spring 810 is wound around the outside of the auxiliary rod 809. The bottom of the stamping head 803 is connected to an upper mold 811. Through the configuration of the stamping mechanism 8, the controller 6 issues a command to activate the hydraulic cylinder 801 above the support bracket 5. The hydraulic system inside the hydraulic cylinder 801 begins to work, pushing the hydraulic rod 802 downwards within the cylinder. Since the bottom of the hydraulic rod 802 is connected to the stamping head 803, the downward movement of the hydraulic rod 802 causes the stamping head 803 to move downwards as well. The support plate 804 connected to the surface of the stamping head 803 also moves downwards accordingly. The limiting plates 805 connected to both ends of the support plate 804 are located inside the support bracket 5. The first limiting groove 806 is provided for sliding, and the first limiting groove 806 provides a guiding function for the limiting plate 805, ensuring that the support plate 804 and the stamping head 803 remain vertical and stable during downward movement, avoiding tilting or deviation, and ensuring stamping accuracy. At the same time, a second limiting groove 807 is provided inside the support plate 804, and a limiting block 808 is slidably connected in the second limiting groove 807. The auxiliary rod 809 connected to the bottom of the limiting block 808 also moves downward as the stamping head 803 descends. A return spring 810 is wound around the outside of the auxiliary rod 809. During the descent of the stamping head 803, the return spring 810 is compressed and stores elastic potential energy. As the stamping head 803 continues to descend, the upper mold 81 connected to its bottom... 1. The upper die 811 gradually approaches the contact spring of the electric switch placed on the lower die 719 inside the collection tank 718. When the two make contact, the upper die 811, under the pressure of the stamping head 803, stamps the contact spring to form the required shape and size. After the stamping process is completed, the hydraulic system of the hydraulic cylinder 801 reverses its operation, pulling the hydraulic rod 802 upward. At this time, the stamping head 803, support plate 804, and other components also move upward. The compressed return spring 810, due to its elastic restoring force, pushes the auxiliary rod 809 and the limiting block 808 upward within the second limiting groove 807, helping the stamping head 803 return to its initial position more smoothly, preparing for the next stamping process. Through this workflow...The stamping mechanism 8 can efficiently and accurately complete the stamping process of the electrical switch contact springs, ensuring the quality of the springs and production efficiency.

[0029] When the equipment is turned on, the foot support 2 first provides stable support, ensuring that the equipment's accuracy is not affected by shaking during processing. Next, the controller 6, as the core control hub, receives instructions from the operator and coordinates the orderly operation of various mechanisms. During the processing preparation stage, the clamping mechanism 7 starts under the command of the controller 6. The cylinder 701 in the transmission device pushes the connecting plate 702, causing the base 703 to move smoothly along the slide rail 705. The rack 706 and ratchet 707 cooperate to convert linear motion into circular motion of the rotating shaft 708, thereby driving the clamping device. The screw 710 in the clamping device rotates under the drive of the rotating shaft 708, and the two side slides 712 move synchronously and relative to each other. Through the connecting rod 715, the chuck 716 precisely places the electric switch contact spring on the lower mold 719, completing the positioning and fixing of the spring. During this process, the collection groove 718 is always ready to collect any debris that may be generated. Then, the stamping process begins, and the stamping mechanism 8 operates under the command of the controller 6. Hydraulic cylinder 801 pushes hydraulic rod 802, causing stamping head 803 and upper mold 811 to move downwards. Under the dual guiding and stabilizing action of limit plate 805 and first limit groove 806, limit block 808 and second limit groove 807, upper mold 811 precisely stamps the spring piece on lower mold 719 to complete the shaping. After stamping, hydraulic cylinder 801 reverses its operation, and return spring 810 assists stamping head 803 in resetting. If mass production is required, clamping mechanism 7 will activate again after the spring piece is stamped. The processed spring is removed, and a new spring to be processed is clamped and placed in the lower mold 719. This cycle is repeated. Throughout the processing, the collection box 3 inside the processing table 1 collects debris that slides from the collection groove 718, keeping the work area clean and preventing debris from interfering with equipment operation or affecting the quality of subsequent spring processing. The entire device, through the close coordination of its various mechanisms, achieves an automated and high-precision processing flow for the contact springs of the electric switch, from loading, positioning, stamping to unloading, greatly improving production efficiency and product quality. Ultimately, the automatic clamping and processing of the entire electric switch is achieved, which is convenient and fast.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An apparatus for processing contact springs of an electric switch, comprising a processing table (1), characterized in that: The bottom of the processing table (1) is equipped with a foot support (2), the inside of the processing table (1) is provided with a collection box (3), the top of the processing table (1) is fixedly connected with a workbench (4), the top of the workbench (4) is fixedly connected with a bracket (5), the surface of the bracket (5) is equipped with a controller (6), and the top of the processing table (1) is provided with a clamping mechanism (7). The clamping mechanism (7) includes a transmission device and a clamping device, wherein the clamping device clamps the workpiece under the action of the transmission device.

2. The apparatus of claim 1, wherein: The transmission device includes a cylinder (701), a connecting plate (702), a base (703), a slider (704), a slide rail (705), a rack (706), a ratchet (707), and a rotating shaft (708). The cylinder (701) is connected to the top of the worktable (4). The output end of the cylinder (701) is connected to the connecting plate (702). The base (703) is connected to the surface of the connecting plate (702). The slider (704) is connected to the bottom of the base (703). The slide rail (705) is connected to the top of the worktable (4). The rack (706) is installed inside the base (703). The ratchet (707) is engaged on the surface of the rack (706). The rotating shaft (708) is fixedly connected to one end of the ratchet (707). A clamping device is provided at one end of the rotating shaft (708).

3. An apparatus for processing contact springs of an electric switch according to claim 2, characterized in that: The clamping device includes a fixed base (709), a screw (710), a spacer (711), a slide (712), a base (713), a slide groove (714), a connecting rod (715), a chuck (716), a fixing plate (717), a collecting groove (718), and a lower mold (719). The fixed base (709) is connected above the worktable (4). One end of the rotating shaft (708) is connected to the screw (710). The spacer (711) is installed in the middle part of the screw (710). The surface of the screw (710) A slide (712) is threaded onto the surface of the worktable (4). A base (713) is connected above the worktable (4). A groove (714) is provided on the surface of the base (713). A connecting rod (715) is connected above the slide (712). A chuck (716) is connected above the connecting rod (715). A fixing plate (717) is connected above the fixing seat (709). A collection groove (718) is provided in the middle part of the fixing plate (717). A lower mold (719) is installed inside the collection groove (718).

4. The apparatus of claim 1 wherein: the contact spring is a contact spring for an electrical switch. The foot support (2) is provided in four identical sets at the bottom of the processing table (1), and is respectively located at the four corners of the bottom of the processing table (1).

5. The apparatus of claim 2 wherein: the contact spring is a leaf spring. The base (703) drives the rack (706) via the slider (704) and the slide rail (705). The outer wall size of the slider (704) matches the inner wall size of the slide rail (705).

6. The apparatus of claim 3, wherein: The threads of the screw (710) are symmetrically distributed around the central axis of the spacer (711), and the outer wall dimension of the bottom of the slide (712) matches the inner wall dimension of the slide groove (714).

7. The apparatus of claim 1 wherein: the contact spring is a contact spring for an electrical switch. It also includes a stamping mechanism (8), which includes a hydraulic cylinder (801), a hydraulic rod (802), a stamping head (803), a support plate (804), a limiting plate (805), a first limiting groove (806), a second limiting groove (807), a limiting block (808), an auxiliary rod (809), a return spring (810), and an upper die (811). The hydraulic cylinder (801) is mounted above the bracket (5). The hydraulic rod (802) is slidably connected inside the hydraulic cylinder (801). The bottom of the hydraulic rod (802) is connected to the stamping head (803). A support plate (804) is connected to the surface of the press head (803). Limiting plates (805) are connected to both ends of the support plate (804). A first limiting groove (806) is opened on the inner side of the bracket (5). A second limiting groove (807) is opened inside the support plate (804). A limiting block (808) is slidably connected inside the second limiting groove (807). An auxiliary rod (809) is connected to the bottom of the limiting block (808). A return spring (810) is wound around the outside of the auxiliary rod (809). An upper mold (811) is connected to the bottom of the press head (803).

Images