A kind of pull-up broaching gear class part phase angle calibration mechanism

Abstract

This utility model relates to a phase angle calibration mechanism for gear parts on an upper broaching machine, belonging to the technical field of auxiliary equipment for upper broaching machine processing. It includes a worktable and a mounting base plate fixedly connected to the outside of the worktable. A base centering block is fixedly connected to the upper surface of the worktable. The mounting base plate is fitted to the side of the base centering block and fixedly connected to the worktable. The mounting base plate is equipped with a pin guide mechanism for limiting the workpiece and a dotting mechanism for marking dots on the workpiece surface. This phase angle calibration mechanism for gear parts on an upper broaching machine utilizes a measuring cylinder piston rod and a pin mounting block arranged coaxially, along with a guide block and a parallel guide structure of the lower slide rail, to drive the pin to smoothly and accurately engage with the gap between the workpiece teeth, achieving reliable limiting. Through the vertical linkage of two cylinders in the dotting mechanism, precise dotting marks are completed, achieving automated phase angle calibration, significantly improving efficiency and consistency.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for upper broaching machine processing, specifically a phase angle calibration mechanism for gear parts on an upper broaching machine. Background Technology

[0002] In the machining of gear parts, broaching machines are widely used for processing critical structures such as internal gear teeth due to their advantages of high broaching efficiency and stable machining accuracy. Precise calibration of the gear phase angle is a core step in ensuring machining quality and directly affects the stability and reliability of gear meshing transmission. Therefore, phase angle limit calibration of the gear workpiece is necessary before broaching.

[0003] Existing gear angle limit calibration mechanisms for broaching machines generally use ordinary cylinders as the driving component. The cylinder piston rod extends to drive the ejector pin to hold the gear workpiece, achieving phase angle limit. However, this structure has significant drawbacks: firstly, the gear workpiece is prone to angle deviation during placement, and there may be instances of workpiece numbers being mixed up and misplaced. This causes the ejector pin driven by the ordinary cylinder to fail to accurately engage between the two gear teeth, resulting in improper limit states such as engaging the tooth tip, tooth root, or not engaging the gear at all. Secondly, if the machine tool is not equipped with corresponding detection and alarm functions, these improper limit states cannot be detected in time. Once the broaching machine starts broaching, it will directly cause broaching tool breakage and workpiece scrap, increasing production costs and posing significant safety hazards. Therefore, a phase angle calibration mechanism for gear parts on broaching machines is proposed to solve the aforementioned problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a phase angle calibration mechanism for gear parts on a broaching machine, which has the advantages of accurate positioning and calibration and high processing efficiency, thus solving the problems mentioned in the background technology.

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

[0006] A phase angle calibration mechanism for gear parts on a broaching machine includes a worktable and a mounting base plate fixedly connected to the outside of the worktable. A base centering block is fixedly connected to the upper surface of the worktable. The mounting base plate is fitted to the side of the base centering block and fixedly connected to the worktable. A reference metal is provided on the surface of the worktable, and a workpiece is provided on the surface of the reference metal. The mounting base plate is provided with a pin guide mechanism for limiting the workpiece, and a dotting mechanism for dotting the workpiece surface.

[0007] The ejector pin guiding mechanism includes a base plate bracket, a measuring cylinder, a measuring cylinder fixing plate, a guide block, a pressure cap, a lower slide rail, an ejector pin mounting block, and an ejector pin. The measuring cylinder is fixedly mounted on the measuring cylinder fixing plate, with one side of the measuring cylinder in close contact with the guide block and the other side of the measuring cylinder in close contact with the pressure cap.

[0008] The dotting mechanism includes a dotting mechanism bracket, a dotting cylinder fixing block, a dotting cylinder limiting block, a cylinder with a guide rod, a dotting mounting plate, a double cylinder, a dotting fixing plate, a pressure pin block, and a pin. The dotting mechanism bracket is fixedly connected to the mounting base plate close to the side of the guide block and the pressure cap. The cylinder with a guide rod is fixedly installed on the dotting mechanism bracket. The dotting cylinder limiting blocks are respectively fixedly installed on the upper and lower sides of the cylinder with a guide rod. One end of the dotting mounting plate is fixedly connected to the cylinder with a guide rod, and the other end of the dotting mounting plate is fixedly connected to the double cylinder.

[0009] Furthermore, a fastener is provided through the mounting base plate, and a groove is provided on the mounting base plate for the fastener to pass through. The groove of the mounting base plate extends in the left and right direction. The mounting base plate is connected to the worktable in an adjustable manner by the fastener passing through the groove. The connection surface between the base center block and the worktable is flat and fits together. One side of the base center block is completely fitted with the side of the mounting base plate.

[0010] Furthermore, the mounting base plate has an assembly groove, and the measuring cylinder, measuring cylinder fixing plate, guide block and lower slide rail are all embedded in the assembly groove and limited. The guide block has a guide groove, the ejector pin mounting block and ejector pin are assembled in the guide groove, the pressure cap is fixedly installed above the guide block and covers the guide groove, and the ejector pin is fixedly connected to the ejector pin mounting block.

[0011] Furthermore, a piston rod is slidably connected inside the measuring cylinder, the piston rod is arranged toward the ejector pin mounting block, and the axis of the piston rod is collinear with the moving direction of the ejector pin mounting block.

[0012] Furthermore, the pressure cap is completely fitted to the upper surface of the guide block, and the pressure cap is provided with a clearance hole at the corresponding position of the piston rod of the measuring cylinder.

[0013] Furthermore, the lower slide rail has a groove inside, the bottom of the ejector pin mounting block and the ejector pin are embedded in the groove of the lower slide rail, the guide groove of the guide block is arranged parallel to the groove of the lower slide rail, and the extension direction of both is the front-back direction.

[0014] Furthermore, the dotting fixing plate is fixedly installed on the output end of the double cylinder, one end of the dotting cylinder fixing block is fixedly connected to the double cylinder, the other end of the dotting cylinder fixing block is assembled and connected to the needle, the pressing pin block is pressed on the top of the needle and fixedly connected to the dotting cylinder fixing block, the axis of the pin is perpendicular to the moving direction of the pin mounting block, and the tip of the pin extends towards the tooth gap of the workpiece to be calibrated.

[0015] Furthermore, the extension and retraction direction of the cylinder with guide rod is the front-to-back direction, the extension and retraction direction of the double cylinder is the up-and-down direction, and the extension and retraction directions of the cylinder with guide rod and the double cylinder are perpendicular to each other.

[0016] Compared with the prior art, this utility model provides a phase angle calibration mechanism for gear-like parts on a broaching machine, which has the following beneficial effects:

[0017] 1. The phase angle calibration mechanism for gear parts on this broaching machine utilizes a structure where the piston rod axis of the measuring cylinder is collinear with the moving direction of the ejector pin mounting block. Combined with the parallel arrangement of the guide groove of the guide block and the groove of the lower slide rail, the ejector pin can be driven to move smoothly in the front-back direction and accurately engage with the gear teeth of the workpiece, thus achieving reliable workpiece positioning. The marking mechanism consists of a guide rod cylinder and a double cylinder that work together in a vertical telescopic direction. The guide rod cylinder moves the pin back and forth to the designated position on the workpiece, while the double cylinder drives the pin to move up and down to complete the marking. The coordinated action of the two mechanisms achieves automated and accurate calibration of the phase angle of gear parts, significantly improving calibration efficiency and consistency.

[0018] 2. This broaching machine gear-type part phase angle calibration mechanism, through the waist groove adjustable connection structure of the mounting base plate, and the base centering block being fully fitted to the side of the mounting base plate, not only allows for fine adjustment of the mounting base plate's position in the left and right directions, ensuring precise alignment of the ejector pin guide mechanism with the workpiece on the reference metal, but also improves the overall assembly stability of the mechanism by utilizing the flat connection between the base centering block and the worktable, avoiding the impact of installation deviations on calibration accuracy; at the same time, the guide groove of the guide block and the groove of the lower slide rail are parallel and extend in the front and back directions, with the ejector pin mounting block and ejector pin being embedded in both, effectively limiting the left and right offset of the ejector pin during movement, ensuring that the ejector pin can accurately push into the gap between the workpiece gear teeth, and improving the accuracy of the phase angle of the internal gears processed by the broaching machine. Attached Figure Description

[0019] Figure 1 This is a perspective view of the overall structure of this utility model;

[0020] Figure 2 This is a side view of the structure of this utility model;

[0021] Figure 3 This is a rear view of the present invention;

[0022] Figure 4 This is a top view of the present invention.

[0023] In the diagram: 1. Dotting cylinder limit block; 2. Cylinder with guide rod; 3. Pressure cap; 4. Measuring cylinder fixing plate; 5. Measuring cylinder; 6. Guide block; 7. Mounting base plate; 8. Base plate bracket; 9. Double cylinder; 10. Dotting mounting plate; 11. Pressing pin block; 12. Dotting fixing plate; 13. Needle; 14. Ejector pin mounting block; 15. Ejector pin; 16. Lower slide rail; 17. Reference metal; 18. Base centering block; 19. Dotting cylinder fixing block; 20. Dotting mechanism bracket; 21. Workpiece; 22. Worktable. Detailed Implementation

[0024] 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.

[0025] Please see Figures 1 to 4 This embodiment discloses a phase angle calibration mechanism for gear-type parts on a broaching machine, comprising a worktable 22 and a mounting base 7 fixedly connected to the outside of the worktable 22. A base centering block 18 is fixedly connected to the upper surface of the worktable 22. The mounting base 7 is disposed against the side of the base centering block 18 and fixedly connected to the worktable 22. A reference metal 17 is disposed on the surface of the worktable 22, and a workpiece 21 is disposed on the surface of the reference metal 17. The mounting base 7 is provided with a pin guide mechanism for limiting the workpiece 21, and a dotting mechanism for dotting the surface of the workpiece 21.

[0026] The ejector pin guiding mechanism includes a base plate bracket 8, a measuring cylinder 5, a measuring cylinder fixing plate 4, a guide block 6, a pressure cover 3, a lower slide rail 16, an ejector pin mounting block 14, and an ejector pin 15. The measuring cylinder 5 is fixedly installed on the measuring cylinder fixing plate 4. One side of the measuring cylinder 5 is in close contact with the guide block 6, and the other side of the measuring cylinder 5 is in close contact with the pressure cover 3.

[0027] Specifically, fasteners are threaded through the mounting base plate 7, and a groove is provided on the mounting base plate 7 for the fasteners to pass through. The groove extends in the left and right direction. The mounting base plate 7 forms an adjustable and fixed connection with the worktable 22 through the fasteners passing through the groove. The connection surface between the base centering block 18 and the worktable 22 is flat and in contact with it, and one side of the base centering block 18 is completely in contact with the side of the mounting base plate 7. The adjustable and fixed connection between the mounting base plate 7 and the worktable 22 is achieved through the groove, which allows for flexible adjustment of the position of the mounting base plate 7 according to actual needs, improving the flexibility and adaptability of the installation. The flat contact between the base centering block 18 and the worktable 22, as well as the complete contact with the side of the mounting base plate 7, ensures the accuracy of the installation of the mounting base plate 7, providing a guarantee for the accurate installation and operation of the subsequent ejector pin guiding mechanism and dotting mechanism.

[0028] It should be noted that the mounting base plate 7 has an assembly groove, in which the measuring cylinder 5, the measuring cylinder fixing plate 4, the guide block 6, and the lower slide rail 16 are all embedded and limited. The guide block 6 has a guide groove, in which the ejector pin mounting block 14 and the ejector pin 15 are assembled. The pressure cap 3 is fixedly installed above the guide block 6 and covers the guide groove. The ejector pin 15 is fixedly connected to the ejector pin mounting block 14. By embedding the main components of the ejector pin guiding mechanism in the assembly groove, each component can be effectively limited and fixed, preventing it from shaking or shifting during operation. This improves the overall stability of the ejector pin guiding mechanism, thereby ensuring the accuracy and stability of the ejector pin 15 during the guiding process, which is beneficial for achieving precise positioning of the workpiece 21.

[0029] It is worth mentioning that a piston rod is slidably connected inside the measuring cylinder 5. The piston rod is positioned towards the ejector pin mounting block 14, and the axis of the piston rod is collinear with the moving direction of the ejector pin mounting block 14. By setting the piston rod axis to be collinear with the moving direction of the ejector pin mounting block 14, the measuring cylinder 5 can directly and effectively push the ejector pin mounting block 14 to move, reducing energy loss and motion deviation. This allows for precise control of the forward distance of the ejector pin 15, preventing the ejector pin 15 from hitting the tooth tip or root of the workpiece 21, thereby protecting the workpiece 21 and the broach from damage and improving the safety and accuracy of the calibration process.

[0030] Furthermore, the upper surface of the pressure cap 3 is completely fitted with the upper surface of the guide block 6, and the pressure cap 3 has clearance holes corresponding to the piston rod of the measuring cylinder 5. The guide groove of the guide block 6 provides a precise moving track for the ejector mounting block 14 and the ejector pin 15, ensuring that the ejector pin 15 can only move in a specific direction, thus improving the straightness of the ejector pin 15's movement. The pressure cap 3 covers the guide groove, which not only prevents dust and other impurities from entering the guide groove and affecting the movement of the ejector pin 15, but also further enhances the constraint effect of the guide block 6 on the ejector mounting block 14 and the ejector pin 15, ensuring the stability of the ejector pin 15's operation.

[0031] In this embodiment, the dotting mechanism includes a dotting mechanism bracket 20, a dotting cylinder fixing block 19, a dotting cylinder limiting block 1, a cylinder with a guide rod 2, a dotting mounting plate 10, a double cylinder 9, a dotting fixing plate 12, a pressure pin block 11, and a needle 13. The dotting mechanism bracket 20 is fixedly connected to the mounting base plate 7, closely attached to the side of the guide block 6 and the pressure cover 3. The cylinder with a guide rod 2 is fixedly mounted on the dotting mechanism bracket 20. The dotting cylinder limiting block 1 is fixedly mounted on the upper and lower sides of the cylinder with a guide rod 2. One end of the dotting mounting plate 10 is fixedly connected to the cylinder with a guide rod 2, and the other end of the dotting mounting plate 10 is fixedly connected to the double cylinder 9. The dotting mounting plate 10 connects the cylinder with a guide rod 2 and the double cylinder 9 to form an integrated motion unit, enabling the cylinder with a guide rod 2 and the double cylinder 9 to work together to achieve precise movement of the dotting mechanism in the front-back and up-down directions, providing a motion basis for accurate dotting.

[0032] The lower slide rail 16 has a groove inside, and the bottoms of the ejector pin mounting block 14 and ejector pin 15 are embedded in the groove of the lower slide rail 16. The guide groove of the guide block 6 is arranged parallel to the groove of the lower slide rail 16, and both extend in the front-back direction. Through the combined action of the groove of the lower slide rail 16 and the guide groove of the guide block 6, the ejector pin mounting block 14 and ejector pin 15 are constrained from both the top and bottom directions, further enhancing the stability of the movement of the ejector pin 15. This allows the ejector pin 15 to more accurately insert into the tooth gap of the workpiece 21, improving the accuracy of the limit and facilitating subsequent phase angle calibration.

[0033] Specifically, the dotting fixing plate 12 is fixedly installed on the output end of the double cylinder 9. One end of the dotting cylinder fixing block 19 is fixedly connected to the double cylinder 9, and the other end of the dotting cylinder fixing block 19 is assembled and connected to the needle 13. The pressing pin block 11 is pressed onto the needle 13 and fixedly connected to the dotting cylinder fixing block 19. The axis of the ejector pin 15 is perpendicular to the moving direction of the ejector pin mounting block 14, and the tip of the ejector pin 15 extends towards the tooth gap of the workpiece 21 to be calibrated. By setting the axis of the ejector pin 15 to be perpendicular to the moving direction and the tip of the ejector pin towards the tooth gap, the ejector pin 15 can accurately insert into the tooth gap vertically, effectively limiting the workpiece 21 and providing a precise positioning reference for subsequent phase angle calibration, which is beneficial to improving the accuracy and precision of calibration.

[0034] It should be noted that the extension and retraction direction of the guide rod cylinder 2 is forward and backward, while the extension and retraction direction of the double cylinder 9 is up and down. The extension and retraction directions of the guide rod cylinder 2 and the double cylinder 9 are perpendicular to each other. Through the combined movement in the forward and backward and up and down directions, the needle 13 can be accurately moved to the position on the surface of the workpiece 21 where dotting is required, improving the flexibility and accuracy of dotting and meeting the dotting needs of workpieces 21 with different positions and shapes.

[0035] The working principle of the above embodiments is as follows:

[0036] First, workpiece 21 is transported by the conveying mechanism to the reference metal 17 on the worktable 22 for positioning. Then, the broach descends and passes through workpiece 21, preparing for subsequent calibration and broaching. Next, the marking mechanism starts working: the guide rod cylinder 2 pushes forward, driving the double cylinder 9 and needle 13 closer to workpiece 21. Then, the double cylinder 9 extends downward, driving the needle 13 to mark phase points on the surface of workpiece 21. After marking, the double cylinder 9 retracts upward, and the guide rod cylinder 2 resets backward, ending the marking process. After marking, the ejector pin guiding mechanism starts... Dynamic limit process: The measuring cylinder 5 extends forward, pushing the ejector pin 15 to move along the track formed by the guide groove of the guide block 6 and the groove of the lower slide rail 16, accurately inserting it between the two teeth of the workpiece 21 to achieve limit. At this time, the equipment will compare the set extension distance of the measuring cylinder 5 with the actual extension distance. If the difference is within the allowable range, the broaching machine will start the broaching operation. If it exceeds the allowable range, an alarm will be triggered, and the broaching machine will stop running immediately. After the broaching operation lasts for several seconds, the measuring cylinder 5 retracts backward, driving the ejector pin 15 to disengage from the workpiece 21, completing one complete broaching cycle.

[0037] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods, and any method that achieves the desired beneficial effect can be implemented. Furthermore, all electrical components in this embodiment are electrically connected to the main controller and power supply. The main controller can be a conventional, known device such as a computer that performs control functions. Those skilled in the art can control the electrical components through simple programming, and the existing disclosed power connection technologies are common knowledge in the field. Therefore, this embodiment will not elaborate further on their specific structural composition and working principles.

[0038] It should be noted that the orientations or positional relationships indicated herein are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of facilitating the description of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] 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. A phase angle calibration mechanism for gear-type parts on a broaching machine, characterized in that: The system includes a worktable (22) and a mounting base plate (7) fixedly connected to the outside of the worktable (22). A base centering block (18) is fixedly connected to the upper surface of the worktable (22). The mounting base plate (7) is set against the side of the base centering block (18) and fixedly connected to the worktable (22). A reference metal (17) is provided on the surface of the worktable (22). A workpiece (21) is provided on the surface of the reference metal (17). A pin guide mechanism for limiting the workpiece (21) is provided on the mounting base plate (7). A dotting mechanism for dotting the surface of the workpiece (21) is provided on the mounting base plate (7). The ejector pin guiding mechanism includes a base plate bracket (8), a measuring cylinder (5), a measuring cylinder fixing plate (4), a guide block (6), a pressure cap (3), a lower slide rail (16), an ejector pin mounting block (14), and an ejector pin (15). The measuring cylinder (5) is fixedly installed on the measuring cylinder fixing plate (4). One side of the measuring cylinder (5) is in close contact with the guide block (6), and the other side of the measuring cylinder (5) is in close contact with the pressure cap (3). The dotting mechanism includes a dotting mechanism bracket (20), a dotting cylinder fixing block (19), a dotting cylinder limiting block (1), a cylinder with a guide rod (2), a dotting mounting plate (10), a double cylinder (9), a dotting fixing plate (12), a pressing pin block (11), and a needle (13). The dotting mechanism bracket (20) is fixedly connected to the mounting base plate (7) close to the side of the guide block (6) and the pressure cover (3). The cylinder with a guide rod (2) is fixedly installed on the dotting mechanism bracket (20). The dotting cylinder limiting block (1) is fixedly installed on the upper and lower sides of the cylinder with a guide rod (2). One end of the dotting mounting plate (10) is fixedly connected to the cylinder with a guide rod (2), and the other end of the dotting mounting plate (10) is fixedly connected to the double cylinder (9).

2. The phase angle calibration mechanism for gear parts on a broaching machine according to claim 1, characterized in that: Fasteners are provided through the mounting base plate (7). The mounting base plate (7) has a groove for the fasteners to pass through. The groove of the mounting base plate (7) extends in the left and right direction. The mounting base plate (7) is connected to the worktable (22) in an adjustable manner by fasteners passing through the groove. The connection surface between the base center block (18) and the worktable (22) is flat and fits together. One side of the base center block (18) is completely fitted with the side of the mounting base plate (7).

3. The phase angle calibration mechanism for gear parts on a broaching machine according to claim 1, characterized in that: The mounting base plate (7) is provided with an assembly groove. The measuring cylinder (5), measuring cylinder fixing plate (4), guide block (6) and lower slide rail (16) are all embedded in the assembly groove and are limited. The guide block (6) is provided with a guide groove. The ejector pin mounting block (14) and ejector pin (15) are assembled in the guide groove. The pressure cap (3) is fixedly installed above the guide block (6) and covers the guide groove. The ejector pin (15) is fixedly connected to the ejector pin mounting block (14).

4. The phase angle calibration mechanism for gear parts on a broaching machine according to claim 1, characterized in that: The measuring cylinder (5) has a piston rod slidably connected inside. The piston rod is arranged toward the ejector pin mounting block (14), and the axis of the piston rod is collinear with the moving direction of the ejector pin mounting block (14).

5. A phase angle calibration mechanism for gear parts on an upper broaching machine according to claim 4, characterized in that: The pressure cap (3) is completely fitted to the upper surface of the guide block (6), and the pressure cap (3) is provided with a clearance hole at the corresponding position of the piston rod of the measuring cylinder (5).

6. The phase angle calibration mechanism for gear parts on a broaching machine according to claim 1, characterized in that: The lower slide rail (16) has a groove inside. The bottom of the ejector pin mounting block (14) and the ejector pin (15) are embedded in the groove of the lower slide rail (16). The guide groove of the guide block (6) is arranged parallel to the groove of the lower slide rail (16), and the extension direction of both is the front-back direction.

7. The phase angle calibration mechanism for gear parts on a broaching machine according to claim 1, characterized in that: The dotting fixing plate (12) is fixedly installed on the output end of the double cylinder (9). One end of the dotting cylinder fixing block (19) is fixedly connected to the double cylinder (9). The other end of the dotting cylinder fixing block (19) is assembled and connected to the needle (13). The pressing pin block (11) is pressed against the needle (13) and fixedly connected to the dotting cylinder fixing block (19). The axis of the ejector pin (15) is perpendicular to the moving direction of the ejector pin mounting block (14). The tip of the ejector pin (15) extends towards the tooth gap of the workpiece (21) to be calibrated.

8. The phase angle calibration mechanism for gear parts on a broaching machine according to claim 1, characterized in that: The extension and retraction direction of the guide rod cylinder (2) is the front-to-back direction, and the extension and retraction direction of the double cylinder (9) is the up-and-down direction. The extension and retraction directions of the guide rod cylinder (2) and the double cylinder (9) are perpendicular to each other.

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