Conical positioning pin for lathe

Abstract

The conical positioning pin comprises a first cylinder, a first cone frustum and a second cylinder which are sequentially connected from left to right, the diameter of the first cylinder is smaller than that of the upper bottom of the first cone frustum, and the first cylinder is used for being inserted into a lathe spindle for a sewing machine spindle connecting rod. The first cone frustum is used for being connected with a sewing machine spindle in a sleeved mode, the diameter of the second cylinder is equal to that of the lower bottom of the first cone frustum, and a strong magnetic sheet is arranged on the end face of the end, away from the first cone frustum, of the second cylinder.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewing machine spindle connecting rod processing parts, and in particular relates to a tapered positioning pin for lathes. Background Technology

[0002] An industrial sewing machine is a sewing machine suitable for mass production in sewing factories or other industrial sectors. Factories that require sewing machines, such as those producing clothing and footwear, use industrial sewing machines.

[0003] One of the most important components in industrial sewing machines is the main shaft connecting rod 13 (e.g., Figure 2 As shown, it includes a shaft mounting hole 131. Currently, the machining method for this shaft mounting hole is to first insert the hole on the blank of the entire spindle connecting rod (with the hole) into a locating pin, then use the locating pin to insert into the spindle of the lathe to position and clamp the spindle connecting rod, then pull out the locating pin, and then use a lathe tool to turn the hole of the blank to form the final shaft mounting hole that meets the requirements. However, the existing locating pin is a common straight shaft, so it can only position the spindle connecting rod blank whose hole diameter is exactly the same as the locating pin diameter. If the blank with a hole diameter larger than the locating pin diameter is positioned, it is easy to cause eccentricity in positioning, which will eventually affect the subsequent cutting effect. Moreover, the current locating pin is set separately from the lathe, so it is easy to lose it. Therefore, it needs to be improved. Utility Model Content

[0004] The purpose of this utility model is to provide a tapered locating pin for lathes, which solves the problems of existing locating pins being unable to locate spindle connecting rod blanks with different hole diameters, easily causing positioning eccentricity, and the current locating pins being separate from the lathe, thus easily being lost.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a tapered locating pin for a lathe, comprising a first cylinder, a first truncated cone, and a second cylinder connected sequentially from left to right. The diameter of the first cylinder is smaller than the diameter of the upper base of the first truncated cone, and the first cylinder is used to insert into the lathe spindle of a sewing machine spindle connecting rod. The first truncated cone is used to fit onto the sewing machine spindle. The diameter of the second cylinder is equal to the diameter of the lower base of the first truncated cone. A strong magnetic sheet is provided on the end face of the second cylinder away from the first truncated cone.

[0007] As preferred, in order to realize the functional diversification, the first circular truncated cone comprises a third cylinder and a conical sleeve sleeved outside the third cylinder, and more than one silica gel clamping strip is arranged on the inner side of the conical sleeve and clamped in the clamping notch.

[0008] As preferred, in order to facilitate the rapid disengagement from the lathe spindle later, the first cylinder is provided with a sliding groove at the end away from the first circular truncated cone, a sliding rod is arranged in the sliding groove, one end of the sliding rod is provided with a limiting table, the other end of the sliding rod is provided with a fourth cylinder inserted into the lathe spindle after extending out of the sliding groove, and the fourth cylinder has the same diameter as the first cylinder.

[0009] As preferred, the length of the first cylinder is 50mm, and the diameter of the third cylinder is 2mm.

[0010] As preferred, in order to facilitate the installation of a hexagonal tool later, an internal hexagonal groove is further arranged at the end of the second cylinder away from the first circular truncated cone.

[0011] As preferred, in order to facilitate the suspension later, an O-shaped hook is arranged on the side of the second cylinder.

[0012] As preferred, the diameter of the first cylinder is 12mm, the included angle of the bevel edge of the first circular truncated cone and the parallel bottom surface O is 4°, the diameter of the upper base of the first circular truncated cone is 22mm, the diameter of the second cylinder is 25mm, and the length of the second cylinder is 25mm.

[0013] As preferred, the second cylinder is provided with more than one anti-skid strip arranged annularly, which facilitates the hand holding and also facilitates the pulling out of the whole component later.

[0014] The utility model has the following beneficial effects: the structure can position the blanks of main shaft connecting rods with different diameters, and can be directly magnetically attracted on the lathe when not in use, which is convenient for users to find. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a front view of the existing main shaft connecting rod;

[0016] Figure 2 is a front view of a conical positioning pin for a lathe in embodiment 1;

[0017] Figure 3 is a perspective view of a conical positioning pin for a lathe in embodiment 1;

[0018] Figure 4A schematic diagram of the assembly structure for mounting the spindle connecting rod to the tapered locating pin disclosed in this embodiment;

[0019] Figure 5 This is a cross-sectional schematic diagram of a tapered locating pin for a lathe in Example 2;

[0020] Figure 6 for Figure 5 Enlarged view of point A;

[0021] Figure 7 This is a cross-sectional schematic diagram of a tapered locating pin for a lathe in Example 3;

[0022] Figure 8 This is a perspective view of a tapered locating pin for a lathe in Example 4;

[0023] Figure 9 This is a perspective view of a tapered locating pin for a lathe in Example 5;

[0024] Figure 10 This is a perspective view of a tapered locating pin for a lathe in Example 6.

[0025] Figure label:

[0026] First cylinder 1, first cone 2, second cylinder 3, strong magnetic sheet 4, third cylinder 201, conical sleeve 202, locking notch 203, silicone locking strip 204, sliding groove 5, sliding rod 6, limiting platform 7, spring 8, internal hexagonal groove 9, O-hook 10, anti-slip strip 11, fourth cylinder 12, main shaft connecting rod 13, shaft mounting hole 131. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] Example 1

[0031] Please see Figures 2-4 As shown in the figure, a tapered locating pin for a lathe disclosed in this embodiment includes a first cylinder 1, a first truncated cone 2, and a second cylinder 3 connected sequentially from left to right. The diameter of the first cylinder 1 is smaller than the diameter of the upper base of the first truncated cone 2, and the first cylinder 1 is used to insert into the lathe spindle of the sewing machine spindle connecting rod. The first truncated cone 2 is used to fit onto the sewing machine spindle. The diameter of the second cylinder 3 is equal to the diameter of the lower base of the first truncated cone 2. A strong magnetic sheet 4 is provided on the end face of the second cylinder 3 away from the first truncated cone 2.

[0032] Preferably, the diameter of the first cylinder 1 is 12mm, the clamping angle between the hypotenuse of the first truncated cone 2 and the parallel base O is 4°, the diameter of the upper base of the first truncated cone 2 is 22mm, the diameter of the second cylinder 3 is 25mm, and the length of the second cylinder 3 is 25mm.

[0033] In this embodiment, the existing column positioning part is set as the current first truncated cone 2. Since the side of the first truncated cone 2 is a conical surface, when the blanks of the main shaft connecting rods 13 of different diameters pass through the first cylinder 1 and are inserted into the first truncated cone 2, they are positioned at different positions on the first truncated cone 2 according to the diameter of the circular hole in the blank of the main shaft connecting rod 13. This ensures that the outer end face of the shaft mounting hole 131 of the blank of the main shaft connecting rod 13 is always without any gap with the outer wall of the first truncated cone 2 (e.g., Figure 4As shown), the traditional straight rod locating pin is not as precise as the tapered locating pin of this application, ensuring that the center of the shaft mounting hole 131 is coaxial with the center of the lathe spindle, thereby making the machining allowance of the inner hole of the spindle connecting rod 13 uniform, and also ensuring that the center of the circular hole of the blank of the spindle connecting rod 13 is on the same straight line as the center of the first conical truncated cone 2. Then, when the first cylinder 1 of the lathe using the tapered locating pin of this structure is fully inserted into the lathe spindle, it ensures that the center point of the blank of the spindle connecting rod 13 is on the same straight line as the center of the lathe spindle (because when the first cylinder 1 is inserted into the lathe spindle, the center of the lathe spindle and the center of the first cylinder 1 are on the same straight line, while the center of the first cylinder 1 and the center of the first conical truncated cone 2 are on the same straight line). (The center points are on the same straight line), and then the product is clamped by the clamping tool on the lathe spindle. This ensures that the center point of the blanks of the spindle connecting rod 13 of different diameters is always consistent with the lathe spindle when they are close to the lathe spindle, and there will be no offset between the center points of the two. Otherwise, the blanks of the rotating spindle connecting rod 13 will rotate eccentrically with the lathe spindle, causing the turning position to be offset and ultimately leading to the scrapping of the product. In addition, this structure is equipped with a strong magnet 4, which can be directly magnetically attached to the lathe when not in use, so that it is not lost by random objects and is convenient for users to find. Therefore, this structure can not only position the blanks of the spindle connecting rods of different diameters, but also magnetically attach the device directly to the lathe when not in use, making it convenient for users to find.

[0034] Example 2

[0035] Please see Figures 5-6 As shown in this embodiment, a tapered locating pin for a lathe is preferably provided. To achieve functional versatility, the first conical truss 2 includes a third cylinder 201 and a tapered sleeve 202 fitted over the third cylinder 201. One or more locking notches 203 are arranged annularly on the third cylinder 201. A silicone locking strip 204, which engages within the locking notch 203, is provided inside the tapered sleeve 202. With this structure, when the entire tapered sleeve 202 is removed from the third cylinder 201, the third cylinder 201 is used to locate a blank of a main shaft connecting rod of one diameter. If it is necessary to locate blanks of main shaft connecting rods of different diameters, the tapered sleeve 202 can be fitted over them. The positioning part is tapered, thus achieving a multi-functional effect and facilitating user operation.

[0036] Example 3

[0037] Please see Figure 7As shown in this embodiment, a tapered locating pin for a lathe is preferably provided. To facilitate quick disengagement from the lathe spindle, a sliding groove 5 is provided at the end of the first cylinder 1 away from the first conical truncated cone 2. A sliding rod 6 is provided within the sliding groove 5. A limiting platform 7 is provided at one end of the sliding rod 6. A fourth cylinder 12, inserted into the lathe spindle, is provided at the other end of the sliding rod 6 extending out of the sliding groove 5. A spring 8, with one end abutting against the fourth cylinder 12 and the other end abutting against the limiting platform 7, is sleeved on the sliding rod 6. The diameter of cylinder 12 is the same as that of the first cylinder 1. When the head of the first cylinder 1 is inserted into the lathe spindle through the above structure, the fourth cylinder 12 at the head is pressed into the sliding groove 5 under the force of the hand behind, and the spring 8 is compressed. When the blank of the spindle connecting rod is positioned outside the lathe spindle, after releasing the hand, the right side moves from the lathe spindle to the right under the action of the spring 8, so that the entire positioning pin can be quickly pulled out from the lathe spindle, and further facilitates the quick removal from the lathe spindle later.

[0038] Preferably, the length of the first cylinder 1 is 50 mm, and the diameter of the third cylinder 201 is 2 mm.

[0039] Example 4

[0040] Please see Figure 8 As shown in this embodiment, a tapered locating pin for a lathe is preferably provided with an internal hexagonal groove 9 at the end of the second cylinder 3 away from the first cone 2 to facilitate the later installation of hexagonal tools. By adding the internal hexagonal groove 9, hexagonal tools can be inserted into the internal hexagonal groove 9 as a special locking tool for unscrewing internal hexagonal screws. At this time, the entire locating pin can be used as a handle for the hexagonal tool, which solves the problem of inconvenience for users to hold the hexagonal tool because it is too thin.

[0041] Example 5

[0042] Please see Figure 9 As shown in the figure, a tapered positioning pin for a lathe disclosed embodiment is preferably provided with an O-hook 10 on the side of the second cylinder 3 for easy suspension. In this embodiment, by providing the O-hook 10, a line can be passed through the O-hook 10 and tied to it to facilitate the suspension of the device and further prevent loss.

[0043] Example 5

[0044] Please see Figure 10As shown in this embodiment, a tapered locating pin for a lathe is preferably provided for easy hand gripping and easy pulling out of the entire component later. The second cylinder 3 is provided with one or more anti-slip strips 11 in a ring. In this embodiment, by distributing multiple anti-slip strips 11 around the second cylinder 3, the contact area with the hand can be increased when the hand grips the second cylinder 3, thereby improving the anti-slip properties, making it easier to grip and easy to pull out of the entire component later.

[0045] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. A tapered locating pin for a lathe, characterized in that: The first cylinder (1), the first truncated cone (2), and the second cylinder (3) are connected sequentially from left to right. The diameter of the first cylinder (1) is smaller than the diameter of the upper base of the first truncated cone (2). The first cylinder (1) is used to insert into the lathe spindle of the sewing machine spindle connecting rod. The first truncated cone (2) is used to fit the sewing machine spindle. The diameter of the second cylinder (3) is equal to the diameter of the lower base of the first truncated cone (2). A strong magnetic sheet (4) is provided on the end face of the second cylinder (3) away from the first truncated cone (2).

2. A tapered locating pin for a lathe according to claim 1, characterized in that: The first truncated cone (2) includes a fourth cylinder (12) and a conical sleeve (202) sleeved outside the fourth cylinder (12). The fourth cylinder (12) has one or more locking notches (203) arranged in a ring. The conical sleeve (202) has a silicone locking strip (204) that is locked in the locking notch (203) on its inner side.

3. A tapered locating pin for a lathe according to claim 2, characterized in that: The first cylinder (1) has a sliding groove (5) at one end away from the first cone (2). A slide rod (6) is provided in the sliding groove (5). A limit platform (7) is provided at one end of the slide rod (6). The other end of the slide rod (6) extends out of the sliding groove (5) and is provided with a third cylinder (201) that is inserted into the lathe spindle. A spring (8) is sleeved on the slide rod (6), with one end abutting against the third cylinder (201) and the other end abutting against the limit platform (7). The diameter of the third cylinder (201) is the same as the diameter of the first cylinder (1).

4. A tapered locating pin for a lathe according to claim 3, characterized in that: The length of the first cylinder (1) is 50 mm, and the diameter of the third cylinder (201) is 2 mm.

5. A tapered locating pin for a lathe according to claim 1, characterized in that: An internal hexagonal groove (9) is also provided at the end of the second cylinder (3) away from the first cone (2).

6. A tapered locating pin for a lathe according to claim 1, characterized in that: The second cylinder (3) has an O-shaped hook (10) on its side.

7. A tapered locating pin for a lathe according to claim 1, characterized in that: The diameter of the first cylinder (1) is 12mm, the clamp between the hypotenuse of the first truncated cone (2) and the parallel bottom surface O is 4°, the diameter of the upper base of the first truncated cone (2) is 22mm, the diameter of the second cylinder (3) is 25mm, and the length of the second cylinder (3) is 25mm.

8. A tapered locating pin for a lathe according to claim 1, characterized in that: The second cylinder (3) is provided with one or more anti-slip strips (11) in a ring.

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