WO2016017938A1

WO2016017938A1 - Bearing device for upper shaft of sewing machine

Info

Publication number: WO2016017938A1
Application number: PCT/KR2015/006660
Authority: WO
Inventors: 김광연
Original assignee: 김광연
Priority date: 2014-07-29
Filing date: 2015-06-29
Publication date: 2016-02-04
Also published as: CN106471173A; KR101527811B1; CN106471173B

Abstract

Disclosed is a bearing device for an upper shaft of a sewing machine. The present invention relates to a bearing device for an upper shaft of a sewing machine, comprising: an upper shaft having one end coupled to a crank and the other end coupled to a driving force delivery medium, the upper shaft being horizontally shaft-mounted on an angle arm of a sewing machine; at least one spiral lead groove formed on the outer circumference of the upper shaft; a first bush installed at a position adjacent to an area surrounding the crank, which is installed on the upper shaft, and along the spiral lead groove; and a second bush, which is installed on one end of the upper shaft that is away from the first bush and along the spiral lead groove, so as to fix the upper shaft to the angle arm together with the first bush and guide the rotation of the upper shaft while supporting the weight of the upper shaft and a load borne by the upper. When the upper shaft of the sewing machine is installed along the angle arm, the present invention prevents movement, shaking, and abrasion of the upper shaft, and thereby reduces driving noise of the sewing machine and extends bush replacement and maintenance cycles.

Description

Upper shaft bearing device of sewing machine

The present invention relates to an upper shaft bearing device of a sewing machine, and more particularly, to an upper shaft bearing device of a sewing machine which prevents the flow and shaking of the upper shaft in installing the upper shaft of the sewing machine along an angle arm.

Drive shaft in the sewing machine, as shown in Figure 1, is divided into the upper shaft 12 is installed along the angle arm 11 and the lower shaft 14 is installed along the bed 13 are interlocked with each other. The upper shaft 12 reciprocates the needle for lock stitch on the feeder, and the lower shaft 14 lowers the bobbin 15 which supplies the lower thread (lower thread) under the feeder, the drum 16, and the rotary hook 17 in order. (14).

In the sewing machine 10, the rotational direction of the upper shaft 12 constituting the drive shaft and the lower shaft 14 for rotating the book are different. In general, the lower shaft 14, which supplies the lower thread during the one-round reciprocation of the lock stitch needle with respect to the feeder, rotates in the opposite direction to the upper shaft 12. FIG. 2 shows the upper shaft 12 and the lower shaft 14 of the sewing machine 10. In order to interlock), the vertical shaft 18 is an example configured to interlock the upper shaft 12 and the lower shaft 14 through the power transmission gear 19.

In the installation of the drive shaft divided into the upper and lower shafts of the sewing machine, it has been designed to reduce the number of parts required and secure enough space for parts placement while reducing noise and vibration during driving. And a proposal to reduce noise and vibration during driving is described in Korean Patent Application No. 10-2000-0022665, which relates to a bearing mechanism that reduces noise, wear and damage by reducing load on the lower shaft and preventing gear shaking. The proposal is described in Republic of Korea Patent Publication No. 10-2007-0048609.

The upper axis of the sewing machine is the wear associated with the sliding and rotational movements, or the resistance caused by the sliding and the rotational movements is determined by the sliding and rotational movement speeds and the loads applied during the sliding and rotational movements, that is, the PV value determined by the surface pressure. It depends greatly. This means that the faster the speed and the higher the surface pressure, the higher the friction rate increases the frictional resistance and the greater the wear.

However, the upper shaft of the existing sewing machine is configured to assist the rotation of the upper shaft by assembling a crank head at one end and assembling a few bearing metal bushes along the longitudinal direction of the upper shaft. The upper shaft is difficult to continuously hold the inter-axis noise and vibration for a long time due to the wear and deformation of the bush, and it is difficult to continuously maintain the rotation of the shaft in a high precision rotation state due to the squeezing of the bush.

The present invention has been made to solve the problems of the prior art, an object of the present invention, the upper shaft bearing of the sewing machine to prevent the flow and shaking of the upper shaft and to prevent squeezing and wear in installing the upper shaft of the sewing machine along the angle arm The purpose is to provide a device.

It is another object of the present invention to provide an upper shaft bearing device of a sewing machine which reduces noise and vibration, squeeze and wear during driving of the upper shaft in laying the upper shaft of the sewing machine along an angle arm.

Still another object of the present invention is to provide an upper shaft bearing device of a sewing machine which reduces the squeeze and wear of the bush in laying the upper shaft of the sewing machine along the angle arm, thereby improving durability of the sewing machine.

The upper shaft bearing device of the sewing machine according to an embodiment of the present invention, the crank is coupled to one end and the other end is coupled to the power transmission medium is the upper shaft is horizontally arranged on the angle arm of the sewing machine; At least one spiral lead groove processed at an outer diameter of the upper shaft; A first bush mounted at a position adjacent to the crank mounted on the upper shaft and mounted along the spiral lead groove; And mounted along one end of the upper shaft away from the first bush to fix the upper shaft to the angle arm together with the first bush and guide the rotation of the upper shaft while supporting the self-weight of the upper shaft and the load applied to the upper shaft. Characterized in that the upper shaft bearing device of the sewing machine comprising a second bush ;.

Another feature of the present invention, the crank is coupled to one end and the other end is coupled to the power transmission medium is the upper shaft is horizontally arranged on the angle arm of the sewing machine; At least one spiral lead groove processed at an outer diameter of the upper shaft; A first bush mounted at a position adjacent to the crank mounted on the upper shaft and mounted along the spiral lead groove; A first shaft mounted on one end of the upper shaft away from the first bush, the first shaft being fixed along the first arm to the angle arm, and mounted along the spiral lead groove to guide rotation of the upper shaft while supporting the weight of the upper shaft and the load applied to the upper shaft. 2 bush; And a third bush mounted to be located close to the first bush or the second bush based on the middle point of the upper shaft or the middle point of the gap between the first bush and the second bush. It features.

Upper shaft bearing device of the sewing machine according to an embodiment of the present invention, the upper shaft is characterized in that the hollow shaft formed with a hollow hole along the longitudinal direction.

The upper shaft bearing device of the sewing machine according to the embodiment of the present invention, the spiral lead groove of the upper shaft is characterized in that the upper shaft bearing device of the sewing machine machined at the position where the first bush and the second bush contact.

In the upper shaft bearing device of the sewing machine according to the embodiment of the present invention, the pitch of the spiral lead groove of the upper shaft on which the first bush is mounted is characterized in that the upper shaft bearing device of the sewing machine is machined in the left-hand direction.

In the upper shaft bearing device of the sewing machine according to the embodiment of the present invention, the pitch of the spiral lead groove of the upper shaft on which the second bush is mounted is characterized in that the upper shaft bearing device of the sewing machine is machined in the right-hand direction.

The upper shaft bearing device of the sewing machine according to the embodiment of the present invention is characterized in that the upper shaft bearing device of the sewing machine is provided with a stopper slit for preventing the axial slip and rotational slip of the third bush on the upper shaft.

The first bush of the upper shaft bearing device of the sewing machine according to the embodiment of the present invention is characterized by the upper shaft bearing device of the sewing machine including a taper head for narrowing the crank and the contact section.

The second bush of the upper shaft bearing device of the sewing machine according to the embodiment of the present invention is characterized by the upper shaft bearing device of the sewing machine including a tapered head that narrows the contact cross section with respect to the power transmission medium.

The first and second bushes and the third bush of the upper shaft bearing device of the sewing machine according to an embodiment of the present invention, the screw hole is formed in each of the upper shaft and the upper shaft bearing device of the sewing machine formed grooves corresponding to the screw holes respectively; It features.

The power transmission medium of the upper shaft bearing device of the sewing machine according to an embodiment of the present invention is characterized in that the upper shaft bearing device of the sewing machine, characterized in that any one selected from a gear or a belt pulley.

According to the upper shaft bearing device of the sewing machine according to an embodiment of the present invention, in installing the upper shaft of the sewing machine along the angle arm, it prevents the flow and shaking of the upper shaft and prevents squeeze and wear to reduce the driving noise of the sewing machine and to replace the bush and It has the effect of increasing the maintenance intervals and the service life of the upper shaft, reducing the eccentric wear and eccentric rotation of the upper shaft, reducing the failure of the entire sewing machine system and maintaining the durability of the sewing machine.

1 is a schematic view of a typical sewing machine body.

Figure 2 is a schematic diagram of the upper and lower shaft portions of the sewing machine drive unit.

Figure 3 is an exploded view of the upper shaft of the sewing machine according to an embodiment of the present invention.

4 is an upper shaft of the sewing machine according to an embodiment of the present invention.

5 is a first bush according to an embodiment of the present invention (a) is a front view, (b) is a cross-sectional view taken along the line A-A of (a).

FIG. 6 is a cross-sectional view taken along the line B-B in FIG. 5 (a). FIG.

7 is a front view of a second bush according to an embodiment of the present invention.

8 is a cross-sectional view taken along the line C-C in FIG.

9 is a cross-sectional view taken along the line D-D of FIG. 7.

10 is a front view of a third bush according to an embodiment of the present invention.

11 is a cross-sectional view taken along the line E-E of FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The upper shaft bearing device of the sewing machine according to the embodiment of the present invention is configured to serve to rotate the upper shaft while fixing the upper shaft of the rotating sewing machine at a predetermined position and supporting the weight of the upper shaft and the load applied to the shaft.

Figure 3 shows an example of the arrangement of the upper shaft bearing device of the sewing machine according to an embodiment of the present invention. Referring to FIG. 3, the crank 230 is assembled at one end of the upper shaft 100, and the first bush 200, the third bush 220, and the second bush 210 are sequentially disposed on the upper shaft 100, respectively. It is assembled and configured to accumulate the upper shaft 100 along the long direction of the angle arm to help smooth rotation of the upper shaft 100. The first bearing 200, the second bush 210 and the third bush 220, the upper shaft bearing device is arranged along the upper shaft 100 in order to prevent the noise and vibration between the shaft by abrasion, deformation, etc. of each bush. It is configured to continuously hold for a long time and prevent the sintering of the bush and the like to support the upper shaft 100 for a long time in a high precision rotation state.

In the upper shaft bearing device of the sewing machine according to the first embodiment of the present invention, the crank 230 is coupled to one end and the other end is coupled to the power transmission medium (shown in the bevel gear) and is horizontally laid on the angle arm of the sewing machine. The upper shaft 100 is configured.

In addition, at least one

spiral lead groove

130 or 130a is formed at an outer diameter of the upper shaft 100.

The first bush 200 is mounted at a position adjacent to the crank 230 adjacent to the upper shaft 100 along the spiral lead groove 130 of the upper shaft 100.

The first bush 200 is mounted along the spiral lead groove 130 to guide the rotation of the upper shaft while supporting the weight of the upper shaft 100 and the load applied to the upper shaft.

In addition, the second bush 210 for fixing the upper shaft 100 to the angle arm together with the first bush 200 is mounted at one end of the upper shaft separated from the first bush 200.

The second bush 210 is mounted along the spiral lead groove 130a to guide the rotation of the upper shaft while supporting the weight of the upper shaft 100 and the load applied to the upper shaft.

In the upper shaft bearing device of the sewing machine according to the second embodiment of the present invention, the crank 230 is coupled to one end and the other end is coupled to the power transmission medium is configured to the upper shaft 100 is horizontally arranged on the angle arm of the sewing machine.

In addition, at least one

spiral lead groove

130 or 130a is formed at an outer diameter of the upper shaft 100.

In addition, the third bush 220, which is biased toward the first bush or the second bush near the middle point of the upper shaft 100 or the middle point between the first bush 200 and the second bush 210, is mounted. Consists of the upper shaft bearing device of the sewing machine comprising a).

Here, reference numeral 203 is a shaft groove formed in the first bush, 213 is a shaft groove formed in the second bush, and 223 is a shaft groove formed in the third bush.

The present invention may be of a hollow shaft type with a hollow hole 110 along the longitudinal direction of the upper shaft (100). When the upper shaft 100 has a hollow hole 110, it is advantageous for high speed rotation by reducing the weight loss and rotational load.

The spiral lead

grooves

130 and 130a of the upper shaft 100 are processed at positions where the first bush 200 and the second bush 210 are in contact with each other. Placing a spiral lead groove enhances the binding force with respect to the engagement of the first bush 200 and the second bush 210 and is also advantageous for positioning each bush.

The pitch of the spiral lead groove 130 on which the first bush 200 is mounted is preferably processed in the left-hand thread direction. On the other hand, the pitch of the spiral lead groove 130a on which the second bush 210 is mounted is preferably processed in the right screw direction. In the case of dividing the pitch direction of the spiral lead groove, it is possible to clearly distinguish the first bush and the second bush and to join the upper bush. That is, the coupling failure and the assembly failure due to the misinsertion of the first bush and the second bush can be prevented.

The upper shaft 100 preferably includes a stopper slit 120 that prevents axial slip and rotational slip of the third bush 220. The third bush 220 is mounted between the gap between the first bush and the second bush and mounted to the upper shaft 100 in a rigid state through the stopper slit 120.

Referring to the upper shaft 100 which is arranged in a straight line on the basis of the angle arm based on the general structure of the sewing machine as shown in FIG. 1, the first bush 200 is located on the left side, and the second bush 210 is located on the right side. The third bush 220 is placed in an intermediate position between them, and these first to third bushes support the rectangular upper shaft 100 to be balanced from left to right, and a solid bearing support that balances and supports through the middle bush. The structure is shown.

The first bush 200 preferably has a tapered head 201 surface that narrows the contact surface with the crank 230. A portion of the tapered head 201 formed in the first bush 200 forms a maximum diameter and a step of the first bush 200 and reduces the contact area by the step so as to reduce friction between the first bush 200 and the crank 230. To reduce wear and lower wear.

Similarly, the second bush 210 may include a taper head 211 that narrows the contact cross section with respect to the power transmission medium. The tapered head 211 reduces contact area with respect to a rotating body such as a power transmission drive gear or a belt pulley to reduce friction and reduce wear between the second bush 210 and the power transmission medium.

Screw holes 202, 212, and 222 are formed in the first bush 200, the second bush 210, and the third bush 220, and a screw (not shown) is inserted through the screw hole to form an upper shaft ( 100 separately assembled firmly. Screw holes 202, 212, and 222 are formed in the first bush 200, the second bush 210, and the third bush 220, and the grooves corresponding to the screw holes are formed in the upper shaft 100. 102a) 112a and 122a may be formed to couple the bushes to the upper shaft through a screw or the like.

Thus, the upper shaft bearing device of the sewing machine according to the embodiment of the present invention, when the upper shaft 100 rotates in the angle arm of the sewing machine under the rotation of a drive source (not shown) such as an external motor, the first bush 200 and the first The second bush 210 and the third bush 220 induce an even rotation of the upper shaft while supporting the load applied to the self-weight and the upper shaft of the upper shaft 100 without any force in the equal balance.

The first bush 200 and the second bush 210 installed on the upper shaft 100 are mounted along the

spiral lead grooves

130 and 130a respectively formed on the outer diameter of the upper shaft 100 to block the axial slip so that the upper shaft To prevent the left and right flow of the 100, the third bush 220 is positioned on the upper shaft 100 in a rigid state through the stopper slit 120 to support near the central portion of the upper shaft 100, the strength of the celebration To increase the durability of the upper shaft.

The upper shaft bearing device of the sewing machine including the first and second bushes and the third bush installed on the upper shaft prevents the flow and shaking of the upper shaft and prevents seizure and wear in installing the upper shaft of the sewing machine along the angle arm. Reduces drive noise, increases bushing replacement and maintenance intervals, and increases the service life of the upper shaft, and reduces eccentric wear and eccentric rotation of the upper shaft, reducing the failure of the entire sewing machine system to maintain the permanent usability of the sewing machine.

Although the present invention has been described with reference to one embodiment shown in the drawings, the present invention is not limited to the embodiment, and may be modified and modified within the scope not departing from the gist of the present invention. Included.

Claims

Crank 230 is coupled to one end and the other end is the power transmission medium is coupled to the upper shaft 100 is composed of a hollow shaft formed horizontally on the angle arm of the sewing machine and the hollow hole 110 along the longitudinal direction; At least one spiral lead groove (130) (130a) processed at an outer diameter of the upper shaft (100); A first bush 200 mounted at a position adjacent to the crank 230 mounted to the upper shaft 100 and mounted along the spiral lead groove 130; And an upper shaft mounted on one end of the upper shaft away from the first bush 200 to fix the upper shaft 100 to the angle arm together with the first bush 200 and to support the weight of the upper shaft 100 and the load applied to the upper shaft. And a second bush (210) mounted along the spiral lead groove (130a) to guide rotation.
Crank 230 is coupled to one end and the other end is the power transmission medium is coupled to the upper shaft 100 is composed of a hollow shaft formed horizontally on the angle arm of the sewing machine and the hollow hole 110 along the longitudinal direction; At least one spiral lead groove (130) (130a) processed at an outer diameter of the upper shaft (100); A first bush 200 mounted at a position adjacent to the crank 230 mounted to the upper shaft 100 and mounted along the spiral lead groove 130; And an upper shaft mounted on one end of the upper shaft separated from the first bush 200 to fix the upper shaft 120 to the angle arm together with the first bush 200 and to support the weight of the upper shaft 120 and the load applied to the upper shaft. A second bush 210 mounted along the spiral lead groove 130a to guide rotation; And a third bush 220 mounted biased to a position close to the first bush or the second bush based on the midpoint of the upper shaft 100 or the midpoint between the gap between the first bush 200 and the second bush 210. Upper shaft bearing device of the sewing machine, including;
The method according to claim 1 or 2,

Spiral lead groove (130) (130a) of the upper shaft 100 is the upper shaft bearing device of the sewing machine machined at the position where the first bush (200) and the second bush (210) contact.
The method according to claim 1 or 2,

The pitch of the spiral lead groove 130 to which the first bush 200 is mounted is the upper shaft bearing device of the sewing machine machined in the left screw direction.
The method according to claim 1 or 2,

The pitch of the spiral lead groove 130a on which the second bush 210 is mounted is an upper shaft bearing device of a sewing machine machined in a right screw direction.
The method of claim 2,

The upper shaft 100, the upper shaft bearing device of the sewing machine is formed with a stopper slit 120 to prevent the axial slip and rotational slip of the third bush (220).
The method according to claim 1 or 2,

The first bush (200) is upper shaft bearing device of the sewing machine including a tapered head (201) for narrowing the contact section with the crank (230).
The method according to claim 1 or 2,

The second bush 210 is the upper shaft bearing device of the sewing machine including a tapered head (211) for narrowing the contact section with respect to the power transmission medium.
The method of claim 2,

Screw holes 202, 212, and 222 are formed in the first bush 200, the second bush 210, and the third bush 220, and the grooves corresponding to the screw holes are formed in the upper shaft 100. 102a) 112a and 122a, the upper shaft bearing device of the sewing machine formed.
The method according to claim 1 or 2,

The upper shaft bearing device of the sewing machine, characterized in that the power transmission medium is any one selected from a gear or a belt pulley.