A table damping mechanism for a sewing machine

Abstract

The utility model provides a kind of table board damping mechanism of sewing machine, belong to sewing machine technical field.It solves the problem of poor damping effect.It includes two parallelly arranged support cross bars below table board, the upper end portion outer circumferential side of the spacer sleeve with annular flange is respectively arranged in the vertical direction in the both ends of support cross bar, support cross bar is connected with the connecting screw of being screwed in the table board by being passed through spacer sleeve and being screwed in the table board upwards, spacer sleeve is sleeved with the shockproof piece that can be compressed deformation along vertical direction, shockproof piece is abutted between the head of support cross bar and connecting screw, connecting screw is also sleeved with shock-absorbing washer, shock-absorbing washer can be compressed deformation along vertical direction, shock-absorbing washer is abutted with the bottom of table board, spacer sleeve is fixed between the head of shock-absorbing washer and connecting screw along vertical direction, and there is gap between the upper end surface of support cross bar and the annular flange of spacer sleeve.It has the advantages such as good damping effect.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, and relates to a sewing machine, and more particularly to a sewing machine table shock absorption mechanism. Background Technology

[0002] A sewing machine is mounted on a worktable. During operation, the machine vibrates, and this vibration is transmitted to the worktable, causing resonance and generating significant noise. To address this, Chinese Patent Application No. 201922277381.9 discloses a vibration damping structure for a sewing machine. The sewing machine includes a worktable, an oil pan, and an oil pan tray. The oil pan tray is connected to the bottom of the worktable by tray screws. The oil pan is connected to the tray by a vibration-damping rubber pad and a positioning screw, passing through the worktable. The sewing machine body is mounted on the oil pan. The vibration damping structure includes a tray damping rubber pad and a rubber pad metal spacer. The oil pan tray has through-holes on both the top and bottom sides. The upper end of the tray screw passes through the through-holes and is fixed to the worktable. The lower end of the tray screw has a cap. The rubber pad metal spacer is fitted onto the tray screw. The upper end of the spacer sleeve has an annular protrusion located between the table and the oil pan tray. The lower end of the rubber pad metal spacer sleeve extends downward through the connecting hole, and the tray damping rubber pad is located outside the lower end of the rubber pad metal spacer sleeve. The tray damping rubber pad is located between the cap and the oil pan tray. The tray damping rubber pad is cylindrical, and a metal washer is fitted on the upper side of the cap on the tray screw. The upper and lower ends of the tray damping rubber pad abut against the bottom surface of the oil pan tray and the upper side of the metal washer, respectively. The upper and lower sides of the annular protrusion abut against the bottom surface of the table and the upper side of the oil pan tray, respectively. The height of the rubber pad metal spacer sleeve below the oil pan tray is greater than the thickness of the annular protrusion. During the operation of the sewing machine, the annular protrusion is compressed by external force and transmits the external force to the oil pan tray and the tray damping rubber pad. The presence of the annular protrusion ensures that the tray damping rubber pad has a certain amount of compression, thus playing a role in damping the vibration of the table.

[0003] However, the vibration damping structure of the sewing machine also has its shortcomings: the annular convex edge directly abuts against the bottom surface of the table and the upper side of the oil pan tray to form a rigid contact. Under the influence of machine vibration, the oil pan tray actually vibrates up and down. Although the damping rubber pad of the tray can dampen the downward direction, the upward direction will be directly transmitted to the table through the annular convex edge of the rubber pad metal spacer, so the damping effect is not good. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a sewing machine table shock absorption mechanism, which solves the problem of poor shock absorption effect.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A sewing machine table shock absorption mechanism includes two parallel support crossbars arranged below the table. Each support crossbar has a spacer with an annular protrusion on its upper outer periphery inserted vertically at both ends. The support crossbars are connected to the table via connecting screws that pass upward through the spacers and are threaded into the table. A shock-absorbing element capable of vertical compression is fitted onto the spacer, resting against the head of the support crossbar and the connecting screw. The connecting screw also has a shock-absorbing washer fitted onto it, capable of vertical compression and resting against the bottom of the table. The spacer is fixed vertically between the shock-absorbing washer and the head of the connecting screw. A gap exists between the upper end face of the support crossbar and the annular protrusion of the spacer.

[0007] When the sewing machine operates, it generates vibrations, which are transmitted to the support crossbar. The support crossbar rests against a shock absorber, and there is a gap between the support crossbar and the annular flange of the spacer. This gap allows the support crossbar to float, preventing the machine's vibrations from being directly transmitted upwards to the table. Instead, they are first transmitted to the shock absorber, where compression and deformation weaken the vibrations. Next, the vibrations are transmitted through the shock absorber to the connecting screw. Since the connecting screw also has a damping washer fitted on it, this washer can be compressed and deformed vertically. The washer rests against the bottom of the table, and the spacer is fixed vertically between the washer and the head of the connecting screw. Thus, the vibrations transmitted to the connecting screw are first transmitted through the spacer to the damping washer, where compression and deformation further weaken the vibrations before they are finally transmitted to the table. This design significantly reduces the vibrations transmitted to the table, effectively improving the shock absorption effect.

[0008] In the above-mentioned sewing machine table damping mechanism, the damping washer is a rubber part, or the damping washer includes a metal body and a rubber layer fixed to the upper and lower ends of the metal body.

[0009] The vibration damping washer is a rubber component. Rubber is elastic and can be compressed and deformed. Thus, the vibration transmitted to the connecting screw is first transmitted to the vibration damping washer through the spacer, and then the vibration is further weakened by the compression and deformation of the vibration damping washer.

[0010] The vibration damping washer consists of a metal body and rubber layers fixed to the upper and lower ends of the metal body. The metal body does not compress or deform, but the rubber layers at both ends can be compressed. In this way, the vibration transmitted to the connecting screw is first transmitted to the vibration damping washer through the spacer, and then the vibration is further weakened by the compression and deformation of the vibration damping washer.

[0011] In the above-mentioned table plate shock absorption mechanism of a sewing machine, the table plate has a through hole, and a T-shaped connector is provided on the table plate. The smaller part of the connector is inserted into the through hole and fixed to the table plate. The lower end of the connector is provided with a connecting hole, and the upper end of the connecting screw is threaded into the connecting hole. The outer diameter of the shock-absorbing washer is larger than the diameter of the through hole.

[0012] The damping washer is fitted onto the connecting screw that extends upward through the spacer, and the outer diameter of the damping washer is larger than the diameter of the through hole. When the connecting screw extends into the through hole and is threaded into the connecting hole located at the lower end of the connector, the damping washer will abut against the bottom of the platform, so that the spacer and the platform do not directly abut against each other. This allows the vibration to be weakened first through the spacer to the damping washer before being transmitted to the platform.

[0013] In the above-mentioned sewing machine table shock absorption mechanism, the shock absorber is a cylindrical rubber component with a central hole.

[0014] In one of the sewing machine table damping mechanisms described above, as another technical solution, the damping component is a spring.

[0015] In one of the above-mentioned sewing machine table shock absorption mechanisms, as another technical solution, the shock absorber is a cylindrical felt with a central hole.

[0016] Whether it's rubber parts, springs, or felt, as shock absorbers, they can all weaken vibrations by deforming when compressed.

[0017] Compared with existing technologies, the table damping mechanism of this sewing machine has a gap between the upper end face of the support crossbar and the annular protrusion of the spacer, and a damping washer is also fitted on the connecting screw. The damping washer abuts against the bottom of the table, and the spacer is fixed vertically between the damping washer and the head of the connecting screw. The existence of the gap makes the support crossbar float. In this way, the vibration of the machine is transmitted to the support crossbar and will not be directly transmitted upward to the table, but will only be transmitted to the shock absorber first. The shock absorber is compressed and deformed, thus weakening part of the vibration. The presence of the damping washer further weakens the vibration transmitted to the connecting screw before it is transmitted to the table, thereby greatly reducing the vibration transmitted to the table and improving the damping effect. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the table shock absorption mechanism of this sewing machine.

[0019] Figure 2 This is a top view of the table damping mechanism of this sewing machine.

[0020] Figure 3 yes Figure 2Sectional view along the AA direction.

[0021] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0022] In the diagram, 1 is the platform; 1a is the through hole; 1b is the mounting window; 2 is the support crossbar; 3 is the spacer; 3a is the annular flange; 4 is the connecting screw; 5 is the shock absorber; 6 is the shock-absorbing washer; 7 is the connector; 7a is the connecting hole; 8 is the metal gasket; and 9 is the rubber damping block. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a sewing machine table shock absorption mechanism includes two parallel support crossbars 2 positioned below the table 1. The two support crossbars 2 are at the same height, and each end of the two support crossbars 2 is vertically fitted with a spacer 3. The spacer 3 is made of metal. The support crossbars 2 are connected to the table 1 by connecting screws 4 that pass upward through the spacer 3 and are threaded into the table 1. A shock absorber 5 is fitted onto the spacer 3. The shock absorber 5 can be compressed and deformed vertically. In this embodiment, the shock absorber 5 is specifically a cylindrical rubber component with a central hole. The shock absorber 5 rests between the support crossbar 2 and the head of the connecting screw 4. A shock-absorbing washer 6 is also fitted onto the connecting screw 4. The shock-absorbing washer 6 can be compressed and deformed in the vertical direction. In this embodiment, the shock-absorbing washer 6 is specifically a rubber part. The shock-absorbing washer 6 abuts against the bottom of the platform 1. The spacer 3 is fixed in the vertical direction between the shock-absorbing washer 6 and the head of the connecting screw 4. There is a gap between the upper end face of the support crossbar 2 and the annular protrusion 3a of the spacer 3. Specifically, the platform 1 has a through hole 1a. The platform 1 is provided with a T-shaped connector 7. The larger part of the connector 7 abuts against the platform 1 and is fixed to the platform 1. The smaller part of the connector 7 is inserted into the through hole 1a. The lower end of the connector 7 is provided with a connecting hole 7a. The upper end of the connecting screw 4 is threaded into the connecting hole 7a. The outer diameter of the shock-absorbing washer 6 is larger than the diameter of the through hole 1a. A metal washer 8 is also fitted onto the connecting screw 4. The metal washer 8 abuts against the head of the connecting screw 4. The lower end of the spacer 3 and the lower end of the shock absorber 5 abut against the metal washer 8.

[0026] Furthermore, such as Figure 1 and Figure 3As shown, each support crossbar 2 is equipped with two rubber damping blocks 9, each of which is conical in shape, wider at the bottom than the top. The platform 1 has mounting windows 1b, and the upper ends of each rubber damping block 9 are located within these windows. In practice, the sewing machine's oil pan has four mating holes at its bottom, the oil pan is embedded within the mounting windows 1b of the platform 1, and the upper ends of each rubber damping block 9 are inserted into the four mating holes at the bottom of the oil pan.

[0027] When the sewing machine is working, it generates vibrations. These vibrations are first buffered by the rubber shock absorber 9 before being transmitted to the support crossbar 2. The support crossbar 2 rests against the shock absorber 5, and there is a gap between the support crossbar 2 and the annular protrusion 3a of the spacer 3. The existence of this gap makes the support crossbar 2 float. In this way, the machine's vibrations are not directly transmitted upwards to the table 1 after being transmitted to the support crossbar 2, but are first transmitted to the shock absorber 5, where the shock absorber 5 is compressed and deformed, thus weakening part of the vibration. Next, the vibration is transmitted to the connecting screw 4 via the shock absorber 5. Since a damping washer 6 is also fitted onto the connecting screw 4, the damping washer 6 can be compressed and deformed vertically. The damping washer 6 abuts against the bottom of the platform 1. The spacer 3 is fixed vertically between the damping washer 6 and the head of the connecting screw 4. Thus, the vibration transmitted to the connecting screw 4 is first transmitted to the damping washer 6 through the spacer 3. The vibration is further weakened by the compression and deformation of the damping washer 6 before finally being transmitted to the platform 1. Through this arrangement, the vibration transmitted to the platform 1 is greatly reduced, significantly improving the vibration damping effect.

[0028] Example 2

[0029] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the shock-absorbing washer 6 includes a metal body and a rubber layer fixed to the upper and lower ends of the metal body, and the shock-absorbing component 5 is a spring or a cylindrical felt with a central hole.

[0030] 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.

Claims

1. A sewing machine table shock absorption mechanism, comprising two parallel support crossbars (2) arranged below a table (1), wherein each end of the support crossbar (2) is provided with a spacer (3) having an annular protrusion (3a) on its upper outer periphery, the support crossbar (2) and the table (1) are connected by a connecting screw (4) passing upward through the spacer (3) and threaded into the table (1), and a shock absorber (5) capable of being compressed and deformed in the vertical direction is fitted on the spacer (3), the shock absorber (5) abutting between the head of the support crossbar (2) and the connecting screw (4), characterized in that, The connecting screw (4) is also fitted with a shock-absorbing washer (6). The shock-absorbing washer (6) can be compressed and deformed in the vertical direction. The shock-absorbing washer (6) abuts against the bottom of the platform (1). The spacer (3) is fixed in the vertical direction between the shock-absorbing washer (6) and the head of the connecting screw (4). There is a gap between the upper end face of the support crossbar (2) and the annular protrusion (3a) of the spacer (3).

2. The sewing machine table shock absorption mechanism according to claim 1, characterized in that, The shock-absorbing washer (6) is a rubber part, or the shock-absorbing washer (6) includes a metal body and a rubber layer fixed to the upper and lower ends of the metal body.

3. The sewing machine table shock absorption mechanism according to claim 2, characterized in that, The platform (1) has a through hole (1a) and a T-shaped connector (7) is provided on the platform (1). The smaller part of the connector (7) is inserted into the through hole (1a) and the connector (7) is fixed to the platform (1). The lower end of the connector (7) is provided with a connecting hole (7a). The upper end of the connecting screw (4) is threaded into the connecting hole (7a). The outer diameter of the shock-absorbing washer (6) is larger than the diameter of the through hole (1a).

4. A sewing machine table shock absorption mechanism according to claim 1, 2, or 3, characterized in that, The shock-absorbing component (5) is a cylindrical rubber component with a central hole.

5. A sewing machine table shock absorption mechanism according to claim 1, 2, or 3, characterized in that, The shock-absorbing component (5) is a spring.

6. A sewing machine table shock absorption mechanism according to claim 1, 2, or 3, characterized in that, The shock absorber (5) is a cylindrical felt with a central hole.

Images