Mounting structure of a cylindrical sewing machine bearing

Abstract

The utility model provides a kind of installation structure of tubular sewing machine bearing belongs to tubular sewing machine technical field.It solves the bearing dismounting problem of existing tubular sewing machine.This sewing machine includes casing and lower shaft that is threaded in casing, the inner ring of bearing is fixedly connected with lower shaft, installation structure includes several mounting pieces and installation hole in casing side wall, bearing is embedded in installation hole, and the outer ring of bearing is matched with the hole wall gap of installation hole, all mounting pieces are spaced fixedly connected on the side wall of casing of installation hole circumferential edge by fastener, mounting piece is pressed on the outer ring of bearing to make bearing be positioned in installation hole.The installation structure of this tubular sewing machine bearing has the advantage that bearing dismounting is convenient.

Description

Technical Field

[0001] This utility model belongs to the technical field of tubular sewing machines and relates to an installation structure for a tubular sewing machine bearing. Background Technology

[0002] A tubular sewing machine is an industrial sewing device specifically designed for cylindrical or tubular fabrics. Its core feature is a cylindrical or tubular support arm that allows fabric (such as sleeves, trouser legs, sock cuffs, etc.) to be threaded onto it.

[0003] Existing tube sewing machines, such as the coverstitch machine disclosed in Chinese patent literature [Patent No.: 201420144572.2; Application Publication No.: CN203782386U], include a housing, a motor, a main shaft, a camshaft, a cam seat, and an upper shaft. The motor is located outside the housing and fixed to the tail of the housing. The output shaft of the motor is coaxial with the main shaft. Pulleys are fitted on both the camshaft and the upper shaft. The camshaft and the upper shaft are driven by the output shaft of the motor through the pulleys and the transmission belt. The pulleys fitted on the camshaft and the upper shaft are located inside the housing.

[0004] This type of coverstitch sewing machine, also known as a tube sewing machine, has an interference fit between the inner ring of the bearing and the camshaft. The camshaft is located in the machine housing. During installation, the bearing needs to be tapped to embed and fix it in the side wall of the machine housing, thus creating an interference fit between the bearing and the machine housing. Components such as pulleys are fixed to the camshaft. When the pulley needs to be replaced, the bearing needs to be tapped again to separate it from the machine housing. This makes bearing disassembly and assembly troublesome, and also makes replacing components such as pulleys mounted on the camshaft difficult. Summary of the Invention

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing an installation structure for a cylindrical sewing machine bearing, thereby solving the technical problem of how to facilitate the assembly and disassembly of the bearing.

[0006] The objective of this utility model can be achieved through the following technical solution: a mounting structure for a cylindrical sewing machine bearing, the sewing machine including a housing and a lower shaft passing through the housing, the inner ring of the bearing being fixedly connected to the lower shaft, characterized in that the mounting structure includes a plurality of mounting pieces and mounting holes located in the side wall of the housing, the bearing being embedded in the mounting holes, and the outer ring of the bearing being clearance-fitted with the wall of the mounting holes, all the mounting pieces being fixedly connected at intervals to the side wall of the housing along the circumferential edge of the mounting holes by fasteners, the mounting pieces pressing on the outer ring of the bearing to position the bearing in the mounting holes.

[0007] The outer ring of the bearing has a clearance fit with the hole wall of the mounting hole, that is, the bearing and the housing are not interference-fitted. When installing the bearing, only need to put the bearing into the mounting hole, and then fix the mounting piece through a fastener, so that the mounting piece presses against the outer ring of the bearing to fix the outer ring of the bearing and position the bearing in the mounting hole. When disassembling, only need to loosen the fastener to remove the bearing without knocking the bearing, making the disassembly and assembly of the bearing convenient. At the same time, the pulley installed on the lower shaft can also be inserted into and taken out from the side of the housing, which is more convenient than the traditional assembly method that needs to be installed inside the housing.

[0008] In the above installation structure of a cylinder sewing machine bearing, an annular groove is provided on the circumferential outer side wall of the outer ring of the bearing, and a split ring is embedded in the groove. The split ring abuts against the side wall of the housing at the circumferential edge of the mounting hole to position the bearing in the mounting hole. By pressing the split ring against the side wall of the housing through the mounting piece, the outer ring of the bearing can be fixed and the bearing can be positioned, which is convenient for positioning and the installation of the bearing is convenient.

[0009] In the above installation structure of a cylinder sewing machine bearing, several mounting grooves are provided in the side wall of the housing, and the mounting grooves communicate with the mounting hole. The mounting piece is embedded in the mounting groove. This structure makes the mounting piece and the fastener not protrude too much, making the outer side wall of the sewing machine relatively flat.

[0010] In the above installation structure of a cylinder sewing machine bearing, the mounting piece is in a mountain shape, and the protruding part in the middle of the mountain of the mounting piece abuts against the outer ring of the bearing. This structure enables the mounting piece to better press the bearing and improves the stability of the bearing.

[0011] In the above installation structure of a cylinder sewing machine bearing, the protruding part in the middle of the mountain of the mounting piece is bent to make the mounting piece elastic. This structure enables the mounting piece to better press the bearing and improves the stability of the bearing.

[0012] In the above installation structure of a cylinder sewing machine bearing, a bushing is provided between the bearing and the lower shaft. The bushing has an interference fit with the inner ring of the bearing, and the bushing and the lower shaft are fixedly connected through a fastener. The provision of the bushing makes the connection between the bearing and the lower shaft more stable.

[0013] Compared with the prior art, the installation structure of a cylinder sewing machine bearing provided by the present utility model has the following advantages:

[0014] 1. In this installation structure, by pressing the bearing with the mounting piece, the bearing can be positioned in the mounting hole. When disassembling, only need to loosen the fastener to remove the bearing without knocking the bearing, making the disassembly and assembly of the bearing convenient.

[0015] 2. This mounting structure allows the pulley mounted on the lower shaft to be installed and removed from the side of the housing, which is more convenient than the traditional assembly method that requires installation inside the housing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the casing of this tube sewing machine.

[0017] Figure 2 This is a tube sewing machine Figure 1 A magnified view of region A in the middle.

[0018] Figure 3 This is a sectional view of the mounting structure of this tube sewing machine.

[0019] Figure 4 This is a tube sewing machine Figure 3 A magnified view of region B in the middle.

[0020] In the diagram, 1 is the housing; 2 is the lower shaft; 3 is the bearing; 31 is the inner ring; 32 is the outer ring; 4 is the mounting plate; 5 is the mounting hole; 6 is the slot; 7 is the open retaining ring; 8 is the mounting groove; and 9 is the bushing. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] like Figure 1 , Figure 2 , Figure 3 As shown, the sewing machine includes a housing 1, a lower shaft 2 passing through the housing 1, a bearing 3, and a mounting structure. The mounting structure includes a mounting plate 4 and an open retaining ring 7.

[0023] The inner ring 31 of the bearing 3 is fixedly connected to the lower shaft 2. Specifically, a bushing 9 is provided between the bearing 3 and the lower shaft 2. The bushing 9 is interference-fitted with the inner ring 31 of the bearing 3. The bushing 9 is fixedly connected to the lower shaft 2 by fasteners such as bolts or screws.

[0024] The housing 1 has a mounting hole 5 in its side wall. The bearing 3 is embedded in the mounting hole 5, and the outer ring 32 of the bearing 3 is clearance-fitted with the wall of the mounting hole 5. The outer circumferential side wall of the outer ring 32 of the bearing 3 has an annular groove 6, and an open retaining ring 7 is embedded in the groove 6.

[0025] like Figure 4As shown, the side wall of the housing 1 has a mounting groove 8, which communicates with the mounting hole 5. The mounting piece 4 is embedded in the mounting groove 8. In this embodiment, there are two mounting pieces 4 and two mounting grooves 8. In actual production, there can be three or four mounting pieces 4 and four mounting grooves 8. The mounting piece 4 is in the shape of a mountain, and the protruding part in the middle of the mountain shape abuts against the outer ring 32 of the bearing 3. The bending of the protruding part in the middle of the mountain shape makes the mounting piece 4 elastic.

[0026] During assembly, first fix the bearing 3 onto the lower shaft 2. Then, insert the lower shaft 2 into the housing 1 through the mounting hole 5, allowing the bearing 3 to embed into the mounting hole 5. Next, fix the mounting plate 4 to the side wall of the housing 1 along the circumferential edge of the mounting hole 5 using fasteners such as bolts. The mounting plate 4 presses against the outer ring 32 of the bearing 3, causing the open retaining ring 7 to abut against the side wall of the housing 1 along the circumferential edge of the mounting hole 5, thus positioning the bearing 3 in the mounting hole 5. During disassembly, loosen the fasteners to remove the mounting plate 4, then loosen the fasteners again to separate the bushing 9 from the lower shaft 2. Remove the bearing 3 to replace the pulley.

[0027] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0028] Although this document frequently uses terms such as housing 1, lower shaft 2, bearing 3, inner ring 31, outer ring 32, mounting plate 4, mounting hole 5, slot 6, open retaining ring 7, mounting groove 8, and bushing 9, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

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