KR0121874B1 - Hook assembly and sewing process - Google Patents

Abstract

In rotary hook assemblies (101) and oscillating shuttle hook assemblies (321), a bearing rib (108,325) on a bobbin case basket (106, 311) or at least its surface layer (217, 324) is composed of a synthetic resin such as a liquid crystal polymer, which has such properties that the amount of the rotating frictional force of the slide contact portion, between the surface layer (217, 324) of the bearing rib (108, 325) and the inside circumference layer (326) of the groove shaped bearing raceway (128, 322) where the bearing rib (108, 325) is fitted, is lower in cases without industrial sewing machine oil than in other cases with the industrial sewing machine oil. By this construction, the hook assembly (101, 321) which has the good durability of the rotating portion without any hook lubrication is realized. Accordingly, the oil stains of threads and sewing materials by hook lubricant is disappeared and the sewing quality enhances. <IMAGE>

Description

Sewing sewing machine

1 is a perspective view of a vertical omnidirectional drum 101 of the first embodiment of the present invention.

2 is a cross-sectional view showing the entire structure of the vertical turning drum 101. FIG.

3 is an exploded perspective view of the vertical all-rotating book 101.

4 is a plan view of the inner drum 106 when viewed from above in FIG.

FIG. 5 is a rear view of the inner drum 106 when viewed from the left in FIG.

6 is a cross-sectional view of the inner drum 106 of the vertical turning drum 101. FIG.

FIG. 7 is an enlarged elevation view cut along the line VII-VII of FIG. 4. FIG.

8 is a cross-sectional view of a portion of the injection molded article 28 of the liquid crystal polymer.

9 is an enlarged cross-sectional view of the inner drum 106 taken along line VII-VIII of FIG. 4 according to another embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view of the inner drum 106 taken along the line VII-VII of FIG. 4 according to another embodiment of the present invention.

11 is an exploded perspective view of the inner drum 71 according to another embodiment of the present invention.

12 is a cross-sectional view showing the vicinity of the fitting flaw 73 of the inner drum 71. FIG.

13 is a perspective view of the inner drum 71 according to the embodiment of the present invention.

14 is a diagram showing an experimental result showing the relationship between the torque required for rotational driving of the outer drum according to the first embodiment of the present invention and the comparative example.

FIG. 15 is an experimental result showing an operation time of clearance between the bearing rib surface layer and the inner circumferential surface of the race groove of the outer drum according to the first and comparative examples of the present invention, that is, an increase amount according to sewing time. Figure.

FIG. 16 shows experimental results showing the quality of sewing products according to the first and comparative examples of the present invention when Teflon # 50 is used as the upper thread and the lower thread.

FIG. 17 is a graph showing the results of experiments showing the quality of sewing products according to the first and comparative examples of the present invention when polyester spanyl is used as the upper thread and the lower thread.

FIG. 18 is a diagram showing experimental results showing the quality of sewing products according to the first and comparative examples of the present invention when cotton yarn # 120 is used as the upper thread and the lower thread.

19 is an enlarged cross-sectional view of a portion of a bearing rib 108 and a race groove 128 in which a coating 129 is formed according to another embodiment of the present invention.

FIG. 20 is an enlarged cross-sectional view of a portion of the vicinity of a bearing rib 108 and a race groove 128 having a sliding member 131 of another embodiment of the present invention.

FIG. 21 is a front view showing a part of the horizontal all-rotating book 1 according to the first embodiment of the present invention.

22 is a plan view of the horizontal all-rotating book 1;

23 is a rear view of the inner drum 4 of the horizontal all-rotating drum 1;

FIG. 24 is a rear view showing the inner drum 34 of the horizontal all-rotating drum according to another embodiment of the present invention. FIG.

25 is a perspective view of a semi-rotating book 321 according to another embodiment of the present invention.

FIG. 26 is a side view showing the middle drum 320 of the half-turn drum 321 of FIG.

* Explanation of symbols for main parts of the drawings

1: horizontal all-round drum 3101: vertical all-round drum

3,82,102: Outer North 4,6,34,71,106: Inner North

5,79,108: Bearing rib 6,83,128: Race groove

8,113: bobbin 11,112,322: stud

16,36,74,216: Bearing rib member 17,37,217: Cover member

18: thread separating unit 19: thread missing part

75,107: Tube 76,109: Rotary stopper groove

114: bobbin case 118: bobbin thread

119: rotation stopper member 122: needle

123: upper thread 129: film

130: groove 131: sliding member

320: middle north 321: half-turn north

The present invention relates to an inner drum and an outer drum of a rotating drum (hook) installed in sewing sewing machines and the like.

Bearing ribs are formed on the outer circumferential surface of the inner drum, which is installed on the sewing machine, and the bearing ribs are fitted in a groove shaped bearing raceway formed on the inner circumferential surface of the outer drum. Only the outer drum is driven to rotate at high speed while the rotation of the outer drum to the downstream side in the rotational direction is prevented by the inner drum rotating stopper member fixed to the main body. In particular, the outer drum of the industrial sewing machine is rotationally driven at a high speed of about 6,000 to 10,000 rpm. Therefore, a large frictional force is generated by sliding the bearing ribs and the race grooves, and a large torque is required for rotation of the outer drum. When the friction between the bearing rib and the race groove is large, the inner surface of the inner stopper groove portion, in which the drum stopper member is to be fitted to the drum stopper member that prevents rotation of the inner drum, is in contact with each other with great force, so that the thread of the upper thread is smoothly removed. This results in an unnecessary change in the tension of the upper thread, resulting in a deterioration in the quality of the rod product and at the same time rubbing the bearing ribs and race grooves, thereby degrading durability.

In order to solve the above problem, there is a known configuration for supplying lubricating oil between the outer circumferential surface of the bearing rib of the inner drum and the inner circumferential surface of the race groove of the outer drum, but the upper thread, the lower thread and the cloth may be damaged by the lubricating oil. have.

Therefore, the structure which coat | covers fluorine resin, such as Teflon (brand name) which has a low coefficient of friction to the bearing rib member of an inner north conventionally, is also known conventionally.

In the prior art as described above, when the fluorine resin or the like is coated, it is fired by stray, and since the thickness of the film is usually as thin as about 10 to 20 µm, the durability is low, and in particular, there is a problem of being easily peeled off in an oilless state.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inner drum and an outer drum of an all-rotating drum configured to enable a smooth and stable high-speed rotational drive of the outer drum by reducing friction in the sliding portion of the inner drum and the outer drum in an oil-free state. It is.

According to the present invention, at least a part of the surface layer of the bearing rib of the outer drum of the rotating drum is required for the rotation of the outer drum when the industrial sewing oil is interposed between the inner peripheral surfaces of the race groove of the outer drum. It is an inner drum of the all-turning drum which is comprised from synthetic resin which becomes larger than the torque when it is not interposed.

Moreover, this invention is the inner side drum of the front rotation book characterized by the said synthetic resin being a liquid crystal polymer.

Moreover, this invention is the inner side drum of the front rotation drum characterized by the said synthetic resin being aromatic polyimide resin.

Moreover, this invention is the inner drum of the all-turning drum characterized by the bearing rib being formed in an endless annular shape, and being fixed to the outer periphery of the cylindrical part of an inner drum main body.

The present invention also provides a bearing rib formed by integrally molding a covering member made of synthetic resin from a thread separating portion of the bearing rib portion to a bearing rib portion of a metal inner drum main body from the thread separating portion of the bearing rib portion to forming a bearing rib. The inner side drum of the all-rotating drum characterized by exposing the metal bearing rib portion toward the upstream side of the outer drum from the covering member.

Further, the present invention is the inner drum of the rotating drum, characterized in that the synthetic resin comprises a metal powder, ceramic powder or other powder composed of a material having high hardness and wear resistance.

Further, in the present invention, at least a part of the surface layer of the race groove of the outer drum of the front drum is required for the rotational driving of the outer drum when the industrial sewing oil is interposed between the inner peripheral surfaces of the bearing ribs of the inner drum. The outer drum of the all-turning drum which is comprised from synthetic resin which becomes larger than the torque when it does not interpose.

Moreover, this invention is the outer side drum of the front rotation book characterized by the said synthetic resin being a liquid crystal polymer.

The present invention is also an outer drum of a sewing machine, wherein the synthetic resin is an aromatic polyimide resin.

In addition, the present invention is a front rotation book in which the bearing rib of the inner drum is fitted into the race groove of the outer drum, and the outer drum is driven to rotate about its rotation axis while rotation of the inner drum is prevented. A main body of an outer drum having grooves formed on an inner circumferential surface thereof, and a sliding member fixed in the groove of the outer drum body and having the race groove, wherein the sliding member is composed of a liquid crystal polymer and an aromatic polyimide resin. It is a rotating drum.

The present invention also provides a sewing method using a rotating drum, wherein the inner drum of the rotating drum is at least a part of the surface layer of the bearing rib of the inner drum between the inner peripheral surface of the race groove of the outer drum and the industrial sewing machine. Consists of a synthetic resin whose torque required for rotational driving of the outer drum when interposed therebetween is greater than that of the industrial sewing machine, and between the surface layer of the bearing rib of the inner drum and the inner circumferential surface of the race groove of the outer drum. It is a sewing method characterized by sewing without interposing industrial sewing oil.

In addition, the present invention relates to a sewing method using a rotating drum, wherein at least a part of the surface layer of the race groove of the outer drum of the rotating drum is interposed with an industrial sewing oil between the inner peripheral surface of the bearing rib of the inner drum. Is composed of a synthetic resin whose torque required for rotational driving of the outer drum of the outer drum is greater than that without the industrial sewing oil, and between the surface layer of the bearing rib of the inner drum and the inner circumferential surface of the race groove of the outer drum. It is a sewing method characterized by sewing without intervening.

In addition, the present invention is that the torque required for rotational driving of the outer drum when at least a part of the surface layer of the bearing rib of the intermediate drum of the semi-rotating drum is interposed with the inner peripheral surface of the race groove of the large drum. An intermediate drum of a semi-rotating drum, which is composed of a synthetic resin that is larger than a torque when no industrial sewing oil is interposed.

Further, in the present invention, at least a part of the surface layer of the raceway of the large drum of the semi-rotating drum has a torque required for rotational driving of the outer drum when the industrial sewing oil is interposed between the inner peripheral surfaces of the bearing ribs of the intermediate drum. A large drum of a semi-rotating drum, which is composed of a synthetic resin that is larger than a torque when no oil is interposed.

In addition, the present invention relates to a sewing method using a semi-rotating drum, in which the intermediate drum of the semi-rotating drum uses industrial sewing oil between at least a portion of the surface layer of the intermediate bearing rib and the inner peripheral surface of the race groove of the large drum. It is composed of synthetic resin which is larger than the torque required for rotational driving of the outer drum when it is interposed, and between the surface layer of the bearing rib of the intermediate drum and the inner peripheral surface of the race groove of the large drum. It is a sewing method characterized by sewing without interposing a sewing oil.

In addition, the present invention is a sewing method using a semi-rotating drum, the outer drum when at least a part of the surface layer of the large drum of the semi-rotating drum interposes the industrial sewing machine oil between the inner peripheral surface of the bearing rib of the intermediate drum The torque required for the rotational drive of the rollers is made of synthetic resin which is larger than the torque when the industrial sewing oil is not interposed therebetween, and the industrial sewing oil is not interposed between the surface layer of the bearing rib of the inner drum and the inner circumferential surface of the race groove of the outer drum. It is a sewing method characterized by performing sewing.

In addition, the present invention, in the drum of the sewing machine, the bobbin wound bobbin threaded, the inner drum is formed with a bearing rib extending in the circumferential direction to the outer peripheral portion, and the inner drum is enclosed, the upper thread is captured to rotate or A drum of a sewing machine comprising an outer drum swinging and extending in the circumferential direction to the inner circumferential part and fitted with bearing ribs, the outer drum supporting the inner drum, wherein at least a part of the surface layer of the bearing rib or the surface layer of the inner circumferential surface of the race groove At least one of them is composed of a synthetic resin in which the torque required for rotational driving of the outer drum when the industrial sewing oil is interposed between the surface layer and the surface layer of the inner circumferential surface is larger than the torque when the industrial sewing oil is not interposed. It is a drum of the sewing machine characterized by.

The invention also provides a sewing machine drum, in which the drum of the sewing machine is the all-round drum, and the outer drum is the all-rotation outer drum.

The invention also relates to a sewing machine drum, in which the drum of the sewing machine is a half-rotating drum and the outer drum swings.

Moreover, this invention is a drum of the sewing machine characterized by the said synthetic resin being a liquid crystal polymer.

Moreover, this invention is the drum of the sewing machine characterized by the said synthetic resin being aromatic polyimide resin.

Moreover, this invention is a drum of the sewing machine characterized by the inner drum containing the cylinder part which accommodates a bobbin, and the said bearing rib is formed in an endless annular shape, and is fitted to the outer periphery of the said normal part.

In addition, the present invention, in the sewing method using the sewing machine drum, the drum of the sewing machine, the inner drum with a bearing rib extending in the circumferential direction to accommodate the bobbin wound bobbin thread and extend in the outer peripheral portion, A race groove formed by the upper thread to be rotated or oscillated and extending in the circumferential direction to the inner circumference to fit the bearing rib, and including an outer drum for supporting the inner drum, and including at least some of the bearing ribs or the layer of the inner circumferential surface of the race groove. At least one of them is made of a synthetic resin in which the torque required for rotational driving of the outer drum when the industrial sewing oil is interposed between the surface layer and the layer of the inner circumferential surface is larger than the torque when the industrial sewing oil is not provided. Sewing is carried out between the surface layer of and the layer of the inner circumferential surface of the race groove without interposing the industrial sewing oil. It is a sewing method using the drum of the sewing machine.

According to the present invention, at least a part of the surface layer of the bearing rib of the inner drum and / or of the race groove of the outer drum is made of, for example, a synthetic resin such as a liquid crystal polymer (liquid crystal polymer). The synthetic resin of has the characteristic that the torque required for the rotational drive of the outer drum of the stand to interpose the industrial sewing oil as lubricating oil between the surface layer and the inner circumferential surface of the race groove is larger than the torque when the industrial sewing oil is not interposed. It is not necessary to supply the same industrial sewing oil to the bearing ribs and race grooves, and it is possible to prevent contamination of the upper thread, the lower thread and the cloth to be sewn by lubricating oil such as industrial sewing oil.

In addition, according to the present invention, since the frictional force between the outer drum and the inner drum due to the rotation of the outer drum can be reduced, it is fitted to the rotary stopper groove of the inner drum and the inner drum rotation stopper groove to prevent rotation of the inner drum. The force between the inner drum rotating stopper member can be reduced, so that the upper thread loop can easily pass between the inner drum rotating stopper groove portion and the inner drum rotating stopper member, and there is no great tension on the upper thread loop. This can improve the quality of the product.

Further, according to the present invention, by using the liquid crystal polymer and the aromatic polyimide resin, the friction between the surface layer of the bearing rib composed of the liquid crystal polymer and the inner circumferential surface of the race groove is reduced, and the wear resistance is improved, thereby improving durability of the inner drum. At least a part of the surface layer of the bearing rib of the inner drum is made of synthetic resin such as, for example, a liquid crystal polymer, and the synthetic resin is interposed between the surface layer and the inner peripheral surface of the race groove of the outer drum when an industrial sewing machine is interposed. Has the characteristic that the torque required for rotational driving of the outer drum of the outer drum is larger than the torque without the industrial sewing oil interposed therebetween. Therefore, it can be made without lubrication. An excellent effect that can be prevented can be achieved.

Since it can be operated without lubrication in this way, there is no consumption of lubricating oil, such as industrial sewing oil, and the structure for supplying such lubricating oil can be skipped, and a structure can be simplified and a maintenance can be performed easily.

In addition, according to the present invention, by using the synthetic resin as described above, it is possible to reduce the torque required for the rotational drive of the outer drum oil-free, so that the upper thread between the rotary stopper groove portion of the inner drum and the rotary stopper member fixed to the main body The tension generated at the time of passage can be reduced, whereby the quality of the finished product can be improved.

The invention may also be practiced in connection with a horizontal full turn book, a vertical full turn book, a half turn book, and the like.

Further, according to the present invention, at least a part of the surface layer of the bearing rib is made of a liquid crystal polymer or an aromatic polyimide resin or a synthetic resin such as trade name Veshye (manufactured by DuPont), so that the friction between the surface layer and the inner circumferential surface of the race groove It can reduce the wear resistance can be improved, and the durability of the inner drum can be improved. In addition, it is possible to further improve the rotation speed of the outer drum.

According to the present invention, the bearing rib member of the inner drum body made of metal is formed by integrally molding (for example, outsert) the covering member of the synthetic resin material from the thread separating portion of the bearing rib member to the thread releasing portion. The covering member can be integrally formed on the bearing rib member with a large strength without the peeling member easily peeling off from the bearing rib member, so there is less friction between the bearing rib of the inner drum and the race groove of the outer drum. As a result, the outer drum can be smoothly and stably rotated at a high speed, thereby eliminating the need to supply lubricant between the bearing ribs and the race grooves, and to prevent damages such as seals and cloths caused by the lubricant. Moreover, in the said seal | separation part which is a part which a thread contact | connects, a metal bearing rib member is directed to the rotation direction upstream of an outer side part from a covering member. Due to the exposed it can be prevented from occurring so-called yarn length.

In addition, since the coating member is formed of a synthetic resin such as a liquid crystal polymer or an aromatic polyimide resin, the friction of the sliding portion is reduced, the wear resistance can be more improved, the wear of the coating member is reduced, and the durability of the inner drum can be improved. Can be.

As described above, according to the present invention, the bearing rib member of the inner drum main body made of metal is integrally molded with a covering member made of synthetic resin material from the thread separating portion of the bearing rib member to the thread releasing portion to form a bearing rib. By exposing the metallic bearing rib member from the covering member toward the upstream side in the rotational direction of the outer drum from the seal member at the seal separating portion, which is the portion where the seal is notified, abrasion resistance can be improved and the thread length can be prevented from being formed. The durability can be improved.

According to the present invention, since the coating member is formed of a synthetic resin such as a liquid crystal polymer or an aromatic polyimide resin, durability and abrasion resistance can be further improved, and processing is also easy, so productivity can be improved.

According to the present invention, a race groove is formed in the outer drum, and a bearing rib is formed in the inner drum, and the bearing rib is fitted into the race groove so that the outer drum is driven to rotate about its rotation axis in a state in which rotation of the inner drum is prevented. . At least a part including the race groove of the outer drum, that is, the entire outer drum or a portion constituting the race groove is formed of a synthetic resin having a small coefficient of friction. Therefore, the amount of wear can be reduced by reducing the friction between the bearing rib of the inner drum made of metal and the race groove of the outer drum. By reducing the wear in this way it is possible to prevent the occurrence of vibration during the rotation of the outer drum due to single wear. In addition, since friction between the bearing ribs and the race groove is lowered, the generation of heat due to this friction is also reduced, and it is possible to prevent burning.

Moreover, according to this invention, a liquid crystal polymer is compatible as a synthetic resin with the said low friction coefficient.

In addition, the outer drum according to the present invention is composed of the outer drum body and the sliding member. The sliding member is made of a synthetic resin having a small friction coefficient, and the outer drum main body can be integrally formed by insert molding, for example. The bearing ribs of the inner drum are fitted into the race groove of the sliding member to reduce the amount of wear between the bearing ribs and the race groove and to stably rotate the outer drum at high speed.

Further, according to the present invention, a synthetic resin containing metal powder, ceramic powder or powder composed of a material having high hardness and abrasion resistance is used as a synthetic resin having a small friction coefficient constituting the sliding member. This also reduces the amount of wear of the race grooves and bearing ribs, and allows the outer drum to rotate stably at high speed.

According to the present invention as described above, a part including the race groove of the outer drum to the minimum, that is, the entire outer drum or the portion constituting the race groove is formed of a synthetic resin having a small friction coefficient. Therefore, the amount of wear can be reduced by lowering the friction between the bearing rib of the inner drum made of metal and the race groove of the outer drum. By reducing the wear in this way it is possible to reduce the occurrence of vibration during the rotation of the outer drum due to uneven wear. In addition, since the friction between the bearing ribs and the race groove is low, the generation of heat due to this friction is also less likely to prevent burning.

Further, according to the present invention, the outer drum is composed of an outer drum body and a sliding member. The sliding member is made of a synthetic resin having a small friction coefficient, and can be integrally formed on the outer drum body by insert formation or out insert molding. The bearing ribs of the inner drum are fitted into the race groove of the sliding member, thereby reducing the amount of wear between the bearing ribs and the race groove and stably rotating the outer drum at high speed.

In addition, according to the present invention, as the synthetic resin constituting the sliding member and having a small friction P coefficient, a synthetic resin including metal powder, ceramic powder, or other powder composed of a material having high hardness and wear resistance is used. This also reduces the amount of wear of the race grooves and bearing ribs and allows the outer drum to rotate stably at high speed.

According to the present invention, at least a part of the surface layer of the bearing rib of the inner drum is composed of liquid crystal polymer or a high density polyethylene including a lubricant, so that the friction coefficient between the bearing rib and the race groove is reduced to drive rotation of the outer drum. It is possible to reduce the required torque, drive the outer drum stably and smoothly, and improve the quality of the finished product.

In particular, in the present invention, at least a part of the surface layer of the bearing rib of the inner drum is composed of liquid crystal polymer, whereby it is not necessary to supply the lubricant to the bearing rib and the race groove of the outer drum. It is possible to achieve an excellent effect that can prevent fouling.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 is a perspective view of a vertical all-rotating book 101 having a horizontal axis of rotation L1 according to the first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the overall configuration of the front rotation book 101 of the embodiment, and FIG. 3 is an exploded perspective view of the front rotation book 101. As shown in FIG. The outer drum 102 has a rotation axis L1 of the rotation shaft 104 in a state in which the rotation shaft 104 which is driven to rotate in the direction of the arrow 103 around the horizontal rotation axis L1 is fixed by the bolt 105. Driven to rotate around the same axis of rotation. The inner drum 106 is accommodated in the outer drum 102.

The inner drum 106 has a plan view viewed from above in FIG. 4, a rear view in FIG. 5, and a longitudinal cross-sectional view in FIG. 6, and includes a cylindrical portion 107 and bearing ribs 108 formed on the outer circumference of the cylindrical portion 107. FIG. ) And a flange portion 110 having an inner drum rotation stopper groove portion 109 formed at one end of the cylinder portion 107 at the inner drum open end side (right side in FIG. 4), and at the other end of the cylinder portion 107. A bottom portion 111 called a bridge formed extending in a straight direction is provided. The bottom 111 is provided with a stud 112 extending coaxially with the tubular portion 107 toward the inner north open end side, and the stud 112 inserts the bobbin 113 into its bobbin case 114 at its distal end. I get caught. The bobbin case 114 is a cylindrical shape having a bottom, and the bottom portion 114a exposed from the inner north open end side is perpendicular to the ground of FIG. 1 by the operation piece 115 and the angular displacement operation of the operation piece 115. The latch piece 116 which can be displaced in the direction of the shaft is provided, and the latch piece 116 meshes with the groove 117 formed in the distal end portion of the stud 112. By angularly displacing the operation piece 115 forward from the right side of FIG. 19, the latch piece 116 is displaced vertically forward to the ground of FIG. 19, and the engagement with the groove 117 can be released. As described above, when the bobbin case 114 is released from the state caught by the inner drum 106 and the bobbin thread 118 wound around the bobbin 113 is consumed, the bobbin 113 is moved together with the bobbin case 114. It can be removed from the drum and replaced with a bobbin wound with a new bobbin.

The inner drum rotation stopper groove 109 of the flange portion 110 is fitted with the projection 120 of the inner drum rotary stopper member 119 fixed to the body of the sewing machine (not shown) so that the inner drum when the outer drum is rotated. Rotation of 106 is inhibited. A needle lowering hole 121 is formed in the tube portion 107, and the needle is reciprocated in synchronism with the rotation operation of the rotation shaft 104 and the outer drum 102 on the axis L2 perpendicular to the rotation axis L1. 122 is inserted. The upper thread 123 inserted into the needle 122 by the needle 122 is captured by the hook portion 124 provided in the outer drum 102 so that the thread forms one sweat via the inner drum 106. The inner drum 106, the bobbin 113 and the bobbin case 114 is made of stainless steel or steel.

The outer drum 102 has a tubular portion 125 in which the hook portion 124 is fixed by a screw or the like (not shown), and a base 126 integrally formed with the tubular portion 125 and through which the rotary shaft 104 is inserted. And an inner north hold piece 127 fixed to the end of the open end of the barrel 125 by vis (not shown) or the like. The inner circumferential portion of the cylinder portion 125 is formed with a race groove 128 to which the bearing rib 108 is fitted. The outer drum 102 may be formed entirely of a liquid crystal polymer made of a synthetic resin having a small friction coefficient, but may also be steel.

6 is a cross-sectional view of the inner drum 106 of the vertically turning drum according to the embodiment described above. The inner drum 106 has a tubular portion 107 in which bearing ribs 108 are formed on the outer circumferential surface, a bridge 111 connected to one end in the axial direction of the tubular portion 107 in a right angle, and an inner side of the bridge 111. The stud 112 is provided toward the open side of the book 106. At the end of the open end side of the inner drum 106, a flange portion 110 extending radially outward is formed. The bearing rib 108 is composed of a bearing rib member 216 and a covering member 217.

In the above-described embodiment, the covering member 217 is not formed in the seal separating portion 18, but as another embodiment of the present invention, such a covering member 217 covers the seal separating portion 18. It may be formed, and in another embodiment, it may be formed so that not only the thread separating part but also the thread missing part 19 may be covered.

The inner drum main body and the bearing rib member 16 may be made of other materials other than steel, for example, metal such as stainless steel, or inorganic materials such as synthetic resin and ceramic.

The inner drum 106 and the outer drum 102 of the vertical full rotation book shown in FIGS. 1 to 6 are assembled as shown in FIG. 1 to form a vertical full rotation book 101. The rotary stopper protrusion 120 of the inner drum rotating stopper member 119 fixed to the main body of the sewing sewing machine is loosely inserted into the rotary stopper groove portion 109 of the inner drum, whereby the outer drum 102 has an arrow 103. Rotation of the inner drum 106 is inhibited when the rotational drive is performed at a high speed in the direction of). A rotating shaft 104 having a horizontal axis is fixed to the outer drum 102, and the rotating shaft 104 is driven by a drive source such as a motor.

7 is an enlarged cross-sectional view taken along the line VII-VII of FIG. The inner drum main body 204a of the inner drum 106 and the bearing rib member 216 are made of steel, and the outer cover 216a of the bearing rib member 216 has a covering member 217 made of liquid crystal polymer at 0.3. It is formed by integrally molding (for example, inserting) to have a thickness t of ˜0.5 mm. Since the covering member 217 is formed with a sufficient thickness as described above, durability is improved. At this time, a part of the covering member 217 is fitted into the groove 220 formed in the bearing rib member 216, thereby preventing the separation. .

The liquid crystal polymer used for the covering member 217 will be described in detail. The liquid crystal polymer having a rod-shaped rigid component in the main chain ( ^- ) of the polymer has a high bond strength between molecules due to the rigid main chain component and is well arranged and crystallized at the time of molding, so that its heat resistance is extremely excellent and high speed Even if the temperature is increased by the friction caused by the outer drum 102 which is rotationally driven, the heat deformation temperature is extremely high, and thus does not deform. In addition, the liquid crystal polymer is composed of rigid molecular chains, and is highly oriented in the flow direction at the time of molding, and thus has high strength and high elastic modulus. It exhibits excellent creep properties that hardly stretch any further. Moreover, the linear expansion coefficient is extremely small, especially the linear expansion coefficient in a flow direction is about 1x10 <^-5> cm / cm / degreeC. Such a coefficient of linear expansion is one step lower than that of other synthetic resins, and dimensional stability equivalent to that of metal can be obtained. As a result, the dimensional change due to environmental temperature difference and humidity difference such as summer and winter is almost zero. In addition, since the liquid crystal polymer also has high weather resistance, it can be used for a long time. Since the liquid crystal polymer has a similar structure in the molten state and the solidified state, the phase change is small and the volume change at the time of solidification is small.

In addition, a very interesting characteristic of the liquid crystal polymer is its ability to damp vibrations. In general, the vibration damping characteristics are excellent in soft materials such as rubber, but the liquid crystal polymer has a high elastic modulus and has a large vibration damping characteristic. In order to improve abrasion resistance, carbon fibers may be mixed in 30% in order to reduce the non-abrasion amount to the liquid crystal polymer and to decrease the abrasion coefficient. In addition, the liquid crystal polymer is composed of a copolymer of parahydroxy benzoic acid and 2-hydroxy-6-natto acid. As another material, you may comprise with a copolymer with another structural component as one structural component which main-chain-bonded 2 or 3 or more types of naphthalene groups. The naphthalene group is a compound having a functional group at two or more substitution positions selected from 1.2, 1.4, 1.5, 1.8, 2.3, and 2.7, and the functional group is a functional group capable of forming polyester and / or polyesteramide You just need That is, the functional group is selected from hydroxy group, carboxyl group, amino group, ester and the like.

The naphthalene group may also be hydroxy naphthoic acid, dihydroxynaphthalene and / or naphthalenedicarboxylic acid.

Components other than the naphthalene group may be a P-phenyl group, a 4.4'-biphenyl group and / or the following structural formula (1), i.e.

(Where X is a group selected from alkylene (1-4 carbon atoms), alkylidene (1-4 carbon atoms), -O-, -S-, -SO-, -SO₂-, -CO-, R, R Is a reactive group such as a hydroxy group, a carboxyl group or esters thereof) and their substituted derivatives.

Further, the bonding unit of the polymer is suitable for esters and / or esteramides and the functional groups forming them are selected from hydroxy groups, carboxyl groups, amino groups, ester groups and the like, and preferably terephthalic acid, hydroquinone, P-diacetoxyphenylene, P-hydroxybenzoic acid and esters thereof, 4-4'dihydroxybiphenyl 4,4'-dicarboxybiphenyl, 4-hydroxy-4'-carboxybiphenyl and esters thereof, of formula (1) X is selected from each dihydroxy, dicarboxyl, hydroxycarboxylate and esters thereof, which is methylene, propenyl or -SO2-, further preferably terephthalic acid, hydroxy benzoic acid, 4,4'-di Hydroxybiphenyl and esters thereof can be selected.

8 is a cross-sectional view of a part of the injection molded article 28 of the liquid crystal polymer that is the covering member 217. The liquid crystal polymer includes an outer skin layer 29 and an inner skin layer 30 whose molecular chains are highly oriented in the flow direction, and a core layer 31 whose orientation is not clear. The thickness of the skin layers 29 and 30 is almost constant, 0.3-0.2 mm, regardless of the thickness of the molded article. The liquid crystal polymer is plasticized by heating, injected into a closed mold and then cooled and solidified to open and take out the mold. Thus, since a coating member can be manufactured by metal-molding a liquid crystal polymer, processing is easy and productivity improves.

Since the skin layers 29 and 30 are strongly oriented in the flow direction, the liquid crystal polymer has excellent mechanical properties with high strength and high modulus of elasticity. However, it is preferable to introduce a reinforcing agent into the rigid skeleton in order to reduce the anisotropy because the anisotropy tends to occur because it is easy to align. Moreover, since it is easy to orientate, the fibrils which peeled from each skin layer 29 and 30 tend to generate | occur | produce. The microfibrils 32 are 0.5 µm, the fibrils 33 are 0.5 µm, and the microfibrils 27 are 0.05 µm. The liquid crystal polymer has a multilayer structure such as the outer skin layer 29, the inner skin layer 30, the core layer 31 and the like, and exhibits large vibration damping characteristics even at a high modulus of elasticity.

Even if the sewing operation is performed at high speed for a long time by using the inner drum 106 having the bearing ribs 108 formed of such a liquid crystal polymer, the bearing ribs 108 formed thereon, the wear on the surface of the bearing ribs 108 remains unchanged. Very few In still another embodiment, in the seal separating portion 18, which is a portion through which the seal passes, the so-called seal length can be prevented by exposing the steel bearing rib member 216 to the covering member 217.

By using such a liquid crystal polymer, even if the sewing operation is performed at a high speed for a long time, the surface wear of the bearing rib 108 and the race groove 128 is extremely small, and durability can be improved significantly. Further, it can be made light in weight, and the end portion 109a of the groove portion 109 on the upstream side of the rotation direction 103 of the outer drum 102 at the time of rotation of the rotation shaft 104 and the rotation direction of the projection 120 ( 103) The force which the edge part 120a of an upstream side comes into contact with each other becomes small. Therefore, when the upper thread passes between the ends 109a and 120a, the tension fluctuations can be eliminated and the quality of the finished product can be improved.

9 is an enlarged cross-sectional view taken along the line VII-VII of FIG. 4 as another embodiment of the present invention. The bearing rib member 236 having the inner drum body 204a and the small holes 238 is made of steel, and the outer surface 236a of the bearing rib member 236 has a covering member 217 made of liquid crystal polymer at 0.3. It is integrally molded to have a thickness t of ˜0.5 mm, in which a portion of the liquid crystal polymer penetrates and fills the pores 238.

In this way, the small hole 238 is formed in the bearing rib member 236, and the liquid crystal polymer is filled in the small hole 238 to prevent the covering member 217 from shifting. As another embodiment of the present invention, FIG. 10 shows a bearing rib 108 composed of a covering member 217 and a bearing rib member 236 of thickness t.

11 is a perspective view of the inner drum 71 used for the vertical turning wheel according to another embodiment of the present invention. The inner drum 71 basically has an inner drum body 72 and a bearing rib member 74 that fits and is fixed to a fitting groove 73 formed in the outer peripheral portion of the inner drum body 72. . The inner drum body 72 has a tubular portion 75, a flange portion 77 having an inner drum rotating stopper groove portion 76 formed at an end of the tubular portion 75, and a bottom portion formed at the end portion of the tubular portion 75. (78).

12 is a cross-sectional view of the vicinity of the fitting groove (73). The bearing rib member 74 is fitted into the fitting groove 73. The bearing rib member 74 has a bearing rib 79 and a fitting protrusion 80 protruding radially inward thereof. The fitting protrusion 80 is formed integrally with the plurality of bearing ribs 79 at intervals in the circumferential direction. The bearing rib 79 is fitted into the race groove 83 of the outer outer drum 82, which will be described later, and the outer drum 82 is rotated at high speed.

13 is a perspective view showing the assembled state of the inner drum 71. As shown in FIG. The bearing rib member 74 is fitted and fixed to the inner drum main body 72. The inner drum 71 is mounted on the outer drum 82, and a bobbin case is attached to the inner drum 71, and the rotary stopper protrusion fixed to the main body of the sewing machine has a rotary stopper groove portion of the inner drum 71 ( 76, and when the outer drum 82 is driven to rotate as shown by the arrow 86, the rotation of the inner drum 71 is inhibited. The axis of rotation of the outer drum 82 has a horizontal axis, and a vertical omnidirectional drum is constructed.

The bearing rib member 74 is made of a liquid crystal polymer that is a synthetic resin or a synthetic resin that is an aromatic polyimide resin, and the endless annular bearing rib 79 has an elastic force, and the elastic force of the bearing rib member 74 The bearing ribs can be pushed into the cylinder portion 75 or the bottom 78 of the inner drum body 71 as shown by reference numeral 89 in FIG. At this time, the fitting protrusion 80 is fitted into the insertion opening 91 extending in the circumferential direction formed in the fitting groove 73 of the inner drum main body 72 to be elastically fitted, so that the bearing rib 79 is the inner drum Although fixed to the main body 72, the bearing rib member 74 may be fixed to the inner drum main body 72 so as to be replaceable at the time of abrasion while making detachable replacement impossible. The inner surface shape of the insertion hole 91 is almost the same as the outer surface shape of the fitting protrusion 80, and the fitting protrusion 80 is fitted and fixed to the insertion hole 91 as described above. Moreover, you may use an adhesive agent in order to detachably fix the bearing rib 79 to the inner drum main body 72. FIG. The bearing rib member 74 is formed in an endless annular shape in the above-described embodiment, but may be formed in a substantially C shape as another modification.

In the present invention, as in each of the embodiments described above, at least a part of the surface layer of the bearing rib of the inner drum is made of a liquid crystal polymer or an aromatic polyimide resin, thereby reducing the coefficient of friction between the bearing rib and the race groove, thereby reducing the outside with a small torque. It is possible to achieve the object of the present invention that the drum can be rotated. By using this liquid crystal polymer or aromatic polyimide resin, the following three important effects are obtained. In other words,

(a) The outer drum can be rotationally driven with a small torque, and in particular, the torque when the industrial sewing oil is interposed between the surface layer of the bearing rib and the inner peripheral surface of the race groove of the outer drum is interposed therebetween. It becomes larger than the torque when it is not made, in other words, it becomes oilless, and can reduce a torque,

(b) As described above, even in the absence of lubrication, a synthetic resin such as Teflon (trade name) having a very small increase in clearance between the surface layer of the bearing rib and the inner circumferential surface of the race groove of the outer drum and having a very small amount of wear It's small enough compared to fluorocarbon resin, so it's particularly durable.

(c) The frequency of thread stitching and thread breakage during lubrication is very small compared with lubrication, which has the effect of improving the quality of the sewing products compared to the drum of the sewing machine which is made of both steel in the inner and outer drums. Is achieved.

At least a part of the surface layer of the bearing rib is made of liquid crystal polymer, so that the coefficient of friction with the race groove of the outer drum can be reduced, and the fact that the outer drum can be rotationally driven with a small torque indicates the experimental results of the present inventors. It will be apparent from the figure.

Lines L1 and L2 shown in FIG. 14 show a bearing rib member 74 made of fluorocarbon resin, which is made of fluorocarbon resin, which is made of teflon, according to the configuration shown in FIGS. 11 to 13 of the present application. The characteristic at the time of using the attached book of sewing machines is shown.

In the industrial sewing machine, in which the rotation speed of the outer drum 82 is 4,000 to 7,000 rpm, it is evident that the use of fluorine resin with no lubrication is impossible as indicated by the line L1 in the industrial sewing machine. When lubricating oil by industrial sewing machine as in line L2 using fluorine resin, the torque for rotational driving of the outer drum 82 is reduced, but when such industrial sewing oil is used, the upper thread, the lower thread and the transition industrial sewing oil are There is a big problem of being fouled.

In the sewing machine using the conventional vertical turning drum, in which the inner drum and the outer drum are steel, the inner drum by the rotation of the outer drum 82 is supplied even if oil is supplied by industrial sewing oil as shown by the line L5 of FIG. The force acting on 71 becomes large, and thus, the force between the rotary stopper groove 109 and the rotary stopper protrusion 120 abutting on it increases, whereby the portion where the groove 109 and the protrusion 12 abut each other. As the upper thread exits between them, the tension on the thread increases. Therefore, the quality of the sewing product is degraded.

In the vertically turning drum according to the present invention, the inner drum main body 72 is made of steel and the bearing rib member 74 is made of liquid crystal polymer, and when it is made oil-free, in the industrial sewing machine as shown by the line L3, The torque required for the rotational drive of the outer drum 82 is also lubricated even at a high speed of rotation, which is smaller than the line L2 of the inner drum using fluorine resin, and has been lubricated with the characteristics shown by the steel line L5. It is proved to be very small compared to the vertical forward drum of.

In the above-described vertical full rotation book having a bearing rib member made of such a liquid crystal polymer, the outer drum as shown in line L4 is provided when an industrial sewing oil is interposed between the surface layer of the bearing rib and the inner peripheral surface of the race groove of the outer drum. It was confirmed that the torque required for the rotational drive of the motor was great. Therefore, in the present invention, at least a part of the surface layer of the bearing rib is composed of a liquid crystal polymer or the like, that is, the torque required for rotational driving of the outer drum 82 when interposing a lubricant such as an industrial sewing oil is increased, and the industrial sewing machine is used. It is important that the resin is made of a synthetic resin having a characteristic of decreasing torque when no oil is interposed, and by further lubricating it, the torque can be sufficiently reduced.

By forming at least a part of the surface layer of the bearing ribs from the liquid crystal polymer, the fact that the clearance between the surface layer of the bearing rib member 74 and the inner circumferential surface of the race groove of the outer drum is kept almost constant and the wear is extremely small It will be apparent from FIG. 15 showing the experimental results of the present inventors.

In Fig. 15, the outer drum 82 is made of steel, and the inner drum body 72 is also made of steel. Line L13, L14 shows the structure to which the rib member 74 which consists of liquid crystal polymers was fixed. In FIG. 15, the rotation speed of the outer drum 82 is 6,500 rpm. The lines L11 and L12 made of the bearing rib member made of a fluororesin material increase rapidly in a relatively short time with no lubrication, and are not suitable for use as a vertical all-rotating drum. In lines L13 and L14 showing the characteristics when the bearing rib member 74 is made of a liquid crystal polymer, the clearance increase amount was extremely small and stable even during sewing operation for a long time, and this characteristic was made of conventional steel represented by the line L15. The drum, i.e., the outer drum and the liquid crystal polymer, are both made of steel and are similar to the characteristics when lubrication is carried out, and the oil-free passage in the steel drum is impossible to use at high speed rotation. Similarly, by using the inner drum formed at least on the surface layer, the liquid crystal polymer was found to have a very small amount of clearance increase and stable for a long time even without lubrication, thus reducing the occurrence of noise and keeping the sewing performance good for a long time.

Further, as apparent in FIGS. 16 to 18 showing the experimental results of the present inventors by using an inner drum having a bearing rib member 74 made of liquid crystal polymer as at least part of the surface layer according to the present invention, It can be seen that the number of defects of thread sticking and thread breaking is reduced, and the quality of the sewing product is improved.

In particular, it can be seen that the quality of the sewing product is further improved by using oil-free oil in the configuration using the liquid crystal polymer. 16 to 18, the rotation speed of the outer drum 82 was set at 6,000 rpm.

In FIGS. 16-18, the structure of the inner side drum whose surface layer of a bearing rib is a liquid crystal polymer made the inner side main body 72 steel, and made the bearing rib member 74 the liquid crystal polymer. The inner drum whose bearing layer had a surface layer of steel was made of steel. In these experiments, the outer drum was made of steel. In the experiment using lubrication, it was performed using industrial sewing oil. According to these experimental results, despite the change in the material of the upper thread and the lower thread and the numbers indicating the characteristics of the material, the number of defects of thread bundling and thread breaking was reduced in the inner drum using the liquid crystal polymer, It can be seen that the number of defects is reduced, and that the quality of the sewing product is improved.

Therefore, it can be seen that the above-mentioned effects a, b, and c are achieved by making at least part of the surface layer of the bearing rib a liquid crystal polymer.

In each of Examples 1 to 13, the same experimental results as those of FIGS. 16 to 18 were obtained, and it was confirmed that the configuration of the present invention was excellent.

Again, good results were obtained in the same manner as in the experiments described above using aromatic polyimide resins instead of liquid crystal polymers.

As another embodiment of the present invention, all materials of the inner drum may be manufactured using a synthetic resin having the aforementioned characteristics, such as a liquid crystal polymer or an aromatic polyimide resin. As long as the synthetic resin having the above-described characteristics, not only the liquid crystal polymer and the aromatic polyimide resin but also other synthetic resins can be used.

In another embodiment of the present invention, at least part of the outer drum 102 including the race groove 128, as shown in FIG. 19, a film 129 having a thickness of about 0.1 to 0.3 mm may be formed. . This film 129 forms a layer of the inner circumferential surface of the race groove 128. Such a coating 129 can be formed by, for example, insert molding a liquid crystal polymer.

In another embodiment of the present invention, polytetrafluoroethylene (abbreviated PTFE) is preferably used as the synthetic resin having a small friction coefficient. Since PTFE is a copolymer of tetrafluoroethylene, it is excellent in heat resistance, chemical resistance, and impact resistance, is easy to process, and such a polytetrafluoroethylene is inexpensive. The invention can be implemented.

20 is an enlarged cross-sectional view of a portion of the vicinity of the bearing rib 108 and the race groove 128 in another embodiment of the present invention. In the present embodiment, the groove 130 is formed on the inner circumferential surface of the outer drum 102, the sliding member 131 having a U-shaped cross section is fixed in the groove 130. The groove 130 has a first end surface 132 extending in a plane perpendicular to the axis of rotation of the outer drum 102 at the open end of the tube portion 107, and the outer end drum perpendicular to the first end surface 132. The first inner circumferential surface 133 extending into the cylindrical surface coaxial with the rotation axis of the rotation axis 102, and the second inner circumferential surface extending from the inward protrusion 134 of the inner north hold piece 127 while extending from the first inner circumferential surface 133. And a second end surface 136 parallel to the first end surface 132 while being perpendicular to the second inner circumferential surface 135 of the inner north inward protrusion 134.

The sliding member 131 is adhered to the second inner circumferential surface 135 and the second end surface 136 only by an adhesive, and is not adhered to the first end surface 132 and the first inner circumferential surface 133 of the barrel 107. . For this reason, when the need to separate the sliding member 131 from the groove 130 occurs, the inner book holding piece 127 is detached from the tube portion 125 to be removed from the tube portion 125 together with the sliding member 131. I can make it. The thickness of this sliding member 131 is selected, for example from 0.3 to 1.2 mm. When the thickness of the sliding member 131 exceeds 1.2 mm, the outer circumferential surface 137 for synthesizing the first inner circumferential surface 133 becomes too thin and the strength is so low that deformation easily occurs. In addition, when the thickness of the sliding member 131 is less than 0.3 mm, the lifetime due to wear is shortened, and the absorption effect of vibration is reduced. Therefore, the thickness of the sliding member 131 is selected from 0.3 ~ 1.2mm.

Such a sliding member 131 is composed of a synthetic resin such as a liquid crystal polymer or an aromatic polyimide resin, and the same liquid crystal polymer as in the above-described embodiment can be used.

By using such a synthetic resin, even if the sewing operation is performed at high speed for a long time, the surface abrasion of the bearing rib 108 and the race groove 128 is extremely small, and the durability can be improved significantly. Moreover, it becomes light and the rotation torque of the rotation shaft 104 may be small, and by this, the motor for rotationally driving the rotation shaft 104 can be miniaturized.

As another embodiment of the present invention, the sliding member 131 may be formed of a synthetic resin including a metal resin, a ceramic powder or a powder made of a material having high hardness and wear resistance as a synthetic resin having a low friction coefficient. .

As the metal powder, an aluminum powder or an epoxy injection molding resin filled with an iron powder in an epoxy resin is preferable, whereby the mechanical strength can be improved.

In addition, ceramic powder is generally sintered by press molding by adding aluminum oxide (Al₂O₃) or a small amount of another metal oxide or binder thereto, and is manufactured by a gas atomizing method that atomizes under an inert atmosphere, and is heated to about 1100 ° C. Its hardness does not change. The specific heat is about four times that of the cemented carbide, the thermal conductivity is about one half of that of the cemented carbide, and the thermal expansion is less. In addition, although it is considerably oxidatively altered to about 1000 ° C. or more of cemented carbide, ceramics are stable up to about 2000 ° C., and have low affinity for most metals, so that welding with other objects is less likely to occur and is resistant to abrasion. I have it.

As described above, part of the outer drum 102 is formed by injection molding by mixing ceramic powder and synthetic resin, so that the ceramic can be produced by a so-called near net save by a hard working material or injection molding, and the degree of post-processing Is greatly reduced. In addition, the ceramic can provide a sliding member that is excellent in wear resistance and heat resistance and can be used for a long time.

As the powder composed of other materials having high hardness and wear resistance, carbon powder or carbon fiber may be added to nickel alloy, cemented carbide and alloys thereof. In this way, the sliding member can be formed by injection molding by mixing the following paper or a plurality of powders and a synthetic resin selected from metal powder, ceramic powder, or a powder made of a material having high hardness and wear resistance. Particularly, the portion of the sliding member that requires high strength is made to increase the mixing ratio of the metal powder, ceramic powder, or other powder made of a material having high hardness and wear resistance to improve the strength, and to provide the portion that requires the strength. On the other hand, the mixing ratio of each powder may be reduced in the portion that does not require high strength. Thereby, the quantity of the powder mixed with synthetic resin can be reduced, manufacturing cost can be reduced, and economical efficiency can be improved.

Further supplementing the configuration of the vertically turning drum shown in Figs. 1 to 20, the inner drum body 204a may be made of stainless steel or steel, for example. In addition, the inner drum main body 240a may be formed of a composite of a synthetic resin and a metal. The synthetic resin and the metal composite are formed by, for example, filling an epoxy resin with metal fibers such as aluminum or brass. The thickness of the said metal fiber uses about 0.01 mm. For this reason, mechanical strengths, such as diameter and compressive strength, improve, and tensile strength increases about 5 times by adding 35% of metal fibers.

Moreover, the epoxy injection molding resin which filled aluminum powder or iron powder with the epoxy resin is also preferable, and mechanical strength becomes strong by this.

As another embodiment of the present embodiment, carbon powder may be added to the synthetic resin instead of the metal in the composite of the synthetic resin and the metal.

The bearing rib members 216, 74 are made of high density polyethylene containing a lubricant, for example grease. The high-density polyethylene containing the said grease is formed by mixing the synthetic resin powder and grease which consist of polyethylene, heating it to about 150 degreeC, and compacting in resin shape. The high-density polyethylene has a specific gravity of 0.94-0.96, a crystallinity of 85-95%, a hardness (Hs) of 75, and a reason degree (**) of 5 hours when acting at 5700 G for 1 hour, and a compressive strength of about 30 Kgf / cm 2 Has Moreover, in the said grease, the lithium soap grease with high heat resistance, or the jelly-type silicone grease which mixed the silica gel with methyl silicone oil may be sufficient. By constituting the bearing ribs 108 of the inner drums 106 and 71 with such a resin, grease in the high density polyethylene comes out and lubricated due to abrasion due to the contact between the bearing ribs 108 and the race groove 128. do.

As another embodiment of the present invention, such a resin may be formed in the surface layer of the bearing rib 108, and the remaining portion other than the surface layer may be made of a synthetic resin or the like having a different composition.

The outer drum 102 may be made of stainless steel, synthetic resin, inorganic material, and other materials.

As another embodiment of the present invention, the bearing rib members 216, 74 are made of liquid crystal polymer. The liquid crystal polymer having a rod-shaped rigid component in the main chain of the polymer has a large molecular force between the rigid main chain components and crystallizes well during molding, so that its heat resistance is extremely excellent and friction by the outer drum 102 driven at high speed is driven. Even if the furnace temperature is high, the heat deformation temperature is extremely high, so there is no deformation. In addition, since the liquid crystal polymer is composed of rigid molecular chains and highly oriented in the flow direction at the time of molding, the liquid crystal polymer has high strength and high modulus of elasticity, and since the molecular chains are arranged in an extended state with respect to the orientation direction, It exhibits excellent creep characteristics with little abnormal stretching. In addition, the coefficient of linear expansion is extremely small, in particular the coefficient of linear expansion in the flow direction is 1 × 10. It is about cm / cm / degreeC. Such a coefficient of linear expansion is a value lower than that of other synthetic resins, and dimensional stability equivalent to that of metal can be obtained. For this reason, the dimensional change due to the temperature difference and the environmental temperature difference such as summer and winter is almost zero. Moreover, since this liquid crystal polymer also has high weather resistance, it can be used for a long time. In addition, since the liquid crystal polymers have similar structures in the molten state and the solidified state, the phase change is small and the volume change at the time of solidification is small.

The present invention can be practiced in a wide range in connection with not only the vertical full rotation book, but also the horizontal full rotation book and the half rotation book.

It is also possible to manufacture the inner and outer drums by materials such as bearing ribs.

21 is a front view showing a part of the horizontal all-rotating book 1 according to the first embodiment of the present invention, and FIG. 22 is a plan view of the horizontal all-rotating book 1. The inner drum 4 is mounted on the outer drum 3 having the vertical axis of rotation 2, and the bearing ribs 5 formed on the outer circumferential surface of the inner drum 4 are mounted on the inner circumferential surface of the outer drum 3; Fit into the race groove 6 formed. The bobbin 8 in which the lower thread is wound is accommodated in the groove part 7 of the inner side drum 4. In the central hole 9 of the bobbin 8, a cylindrical stud 11 protruding from the bottom 10 of the inner drum 4 toward the open end of the inner drum 4 is inserted. At the end of the stud 11, a hold piece 12 which is stable in two positions extending in the axial direction and angularly displaced in the radial direction is provided so as to be angularly displaced. The hold piece 12 is shown in FIG. As described above, when the bobbin 8 is knocked down so as to extend in the radial direction of the inner drum 4 in a state of being accommodated in the groove 7 of the inner drum 4, the bobbin 8 in the groove portion 7 becomes stable. ) Is pulled out and stopped, and the bobbin 8 can be removed from the inner drum 4 by making the hold piece 12 stand up along the length direction of the stud 11.

The inner drum 4 is provided with a contact portion 13 protruding in a radial direction, and the contact portion 13 is provided with an inner drum rotation stopper member (not shown) in contact with the inner drum 4 accompanied by the rotation of the outer drum. Rotation is prevented, and in this state, the outer drum 3 is driven to rotate around the rotation axis L1. The outer drum 3 is provided with a knife tip 14, and the upper thread captured by the knife tip 14 moves in the direction indicated by the arrow 15, and passes along the outer circumferential surface of the inner drum 4. It is comprised so that seam can be shape | molded continuously to the to-be-sealed material by engaging with the bobbin thread drawn out from the said bobbin 8.

23 is a rear view of the inner drum 4 of the horizontal all-rotating drum 1. The inner drum 4 comprises an inner drum main body 4a and bearing ribs 5 formed on an outer circumferential surface of the inner drum main body 4a, and the bearing ribs 5 have a seal separation portion 18 and The thread omission part 19 is formed in the state segmented in the circumferential direction. The bearing rib 5 is composed of a bearing rib member 16 and a covering member 17. In the seal separating portion 18, the bearing rib member 16 is the outer drum 3 from the covering member 17. It faces to the upstream side of the rotating direction Y of and is exposed. Moreover, the groove | channel 20 is formed in the bearing rib member 16, and a part of covering member 17 is fitted in this groove | channel 20.

The cross section taken along the line A-A in FIG. 23 is the same as that shown in FIG.

In addition, the inner drum 34 of the horizontal all-rotating drum according to another embodiment of the present invention shown in FIG. 24 is configured to include bearing ribs 35 formed on the outer circumferential surface of the inner drum body 34a. The bearing ribs 35 are formed in a state in which the seal separating portion 18 and the thread separating portion 19 are divided. The bearing rib 35 is composed of a bearing rib member 36 and a covering member 37. In the seal separating portion 18, the bearing rib member 36 is rotated by the outer drum 3 in the covering member. It faces the upstream side of the direction Y, and is exposed. In the bearing rib member 36, a small hole 38 having a diameter of about 1.0 mm has a distance of about θ = 50 ° in the circumferential direction from the center point 39 of the inner drum 4 to the bearing rib member 36. Five to six are formed, and the small holes 38 are filled with a liquid crystal polymer. The cross section cut along the line B-B of FIG. 24 is the same as FIG. 9 described above, and the cross section cut along the line C-C is the same as FIG.

In addition, as another embodiment of the present invention, in the above-described horizontal all-rotation book 1 of FIGS. 21 to 24, the same coating as the embodiment shown in FIGS. 19 and 20 instead of the coating 17 is shown. 129 and the sliding member 131 may be provided. Also in this case, the wear between the sliding member and the bearing ribs can be reduced to improve durability.

In each of the embodiments of FIGS. 19 to 22, the covering members 217, 129 and the sliding member 131 may be made of a liquid crystal polymer as described above, but may be an aromatic polyimide resin as another embodiment. It may also consist of a high density polyethylene containing a lubricant.

A film 47 is formed on the inner surface of the race groove 6 of the outer drum 3 of the horizontal turning drum, such as the film 129 of the embodiment shown in FIGS. 19 and 20. As described above, the coating film 47 is made of a synthetic resin having a small coefficient of friction, that is, a synthetic resin such as polytetrafluoroethylene or a liquid crystal polymer, an aromatic polyimide resin, and achieves the same effect as the vertical full rotation book 101. can do.

In the horizontal full-turn drum, the entire outer drum 3 according to another embodiment of the present invention may be made of a synthetic resin having a small coefficient of friction, that is, tetrafluoroethylene, or a synthetic resin such as a liquid crystal polymer or an aromatic polyimide resin. It may be comprised. In this case as well, wear between the bearing ribs 5 and the race grooves 6 is reduced as much as possible, noise of the drum can be reduced, and the outer drum 3 can be smoothly rotated and driven at high speed. Furthermore, since the race groove 6 formed by the film 129 and the sliding member 131 is formed with high precision, a uniform contact force in the circumferential direction with respect to the bearing rib 5 fitted in the race groove 6 is provided. Abrasion can be prevented because it can be obtained.

25 is a perspective view showing the entire semi-rotating book 321 having an intermediate drum 320 according to the first embodiment of the present invention. 26 is a side view of the middle drum 320. A semi-rotating drum 321 having the intermediate drum 320 is disposed below the needle plate 335 installed on the sewing bed. The anti-rotating drum 321 is fitted with a bearing rib 336 in the race groove 311 formed on the inner circumferential surface of the large drum 310 to support the intermediate drum 320, and the bottom portion 323 of the intermediate drum 320. The bobbin case is mounted to the stud 322 inserted into the). The bobbin in which the bobbin thread 338 is wound is accommodated in the bobbin case.

The driver 340 is disposed on the opposite side with respect to the rotation axis l2 of the intermediate drum 320. The driver 340 has a rotation axis which forms a straight line in common with the rotation axis l 2 of the intermediate drum 320. The lower shaft 343 of the sewing machine is fixed to the attachment portion 342 which is connected to the driver body 341. The axis of rotation of the lower axis 343 and the axis of rotation l 2 of the intermediate drum 320 and the driver 340 are in a common straight line.

When the sewing operation is started, the intermediate drum 320 is driven half-rotating in the direction of the arrow D1 while the rotation of the lower shaft 343 is blocked. In addition, when the driver 340 rotates in the direction of the arrow D2, the other end 350 of the driver 340 abuts against the inner surface of the groove 27 to press, thereby preventing rotation of the bobbin case 337. In this state, the intermediate drum 320 is rotated in the direction of arrow D2 opposite to the rotation direction D1.

In the semi-rotating book 321 driven in this way, the needle thread caused by the needle 334 reciprocating up and down is captured by the knife tip 325, and the intermediate drum 320 is supplied to the driver 340. Thereby rotating in the direction of arrow D1 to form a needle thread loop. At this time, the needle thread is disposed in the lower position, and moves along the guide surface of the needle thread guide protrusion forming the groove together with the knife end 325, and the reciprocating half-rotation drive in the direction of arrows D1, D2 around the main axis of the sewing machine. At the same time, the needle 344 is reciprocated up and down in association with the lower shaft 343, and the needle thread near the knife tip 325 of the middle drum 320 through the needle hole 345 formed in the needle plate 325. 346 is brought. In addition, the lower thread 338 wound on the bobbin stored in the bobbin case 337 is connected to the bobbin case 337 on the outer circumferential surface 347 of the bobbin case 337 via a lower thread insertion hole formed in the bobbin case 337. It is elastically tightly pressed by 348 and is led upward from the needle plate 335 through the needle hole 345. The bobbin case 337 is provided with a rotary stopper member 337a integrally formed therein, and a fitting groove of the intermediate drum pressing member in which the rotary stopper member 337a rests integrally with the sewing machine bed is fixed (not shown). The rotation of the bobbin case 337 is prevented from being fitted to the body and accompanying the half-rotation operation of the intermediate drum 320.

The driver 340 is reciprocated half-rotation drive in the direction of arrows D1, D2 by the half-rotation drive of the lower shaft 43. When the driver 340 rotates in the direction of the arrow D1, one end portion 349 abuts on the middle drum 320 and is pressed in the same direction, thereby raising the balance (not shown) provided in the bobbin case 337 main body. The operation changes to the outer circumferential surface of the bobbin case 337, and as the balance rises, the needle thread 346 slides while sliding to the outer circumferential surface of the bobbin case 337. Thus, the needle thread 346 pulled upward by the balance is engaged with the lower thread 338 drawn out of the bobbin in the bobbin case 337 to form a seam.

When the needle thread 346 is changed from the cutting edge 325 to the outer circumferential surface of the bobbin case 337, the intermediate drum 320 is rotated in the direction of arrow D2 to return to the initial position (state shown in FIG. 25). The needle 340 is again driven by the driver 340 in the direction of arrow D1 to capture the needle thread brought near the knife tip 325 by the downward operation of the needle 344 to form a needle thread loop. This series of operations is repeated to form a continuous seam.

The bearing ribs 336 of the intermediate drum 320 shown in FIG. 26 have at least a portion of the surface layer of liquid crystal polymer and aromatic poly, in the same manner as in the embodiment described in connection with the vertical rotation book and the horizontal rotation book. It consists of synthetic resin materials, such as a mid resin. At this time, the large drum 310 may be made of steel.

As another embodiment of the present invention, the intermediate drum 320 is made of steel, or the like, and a part of the inner circumferential surface of the race groove 311 of the large drum 310 is made of liquid crystal polymer or aromatic polyimide resin as in the above-described embodiment. It is good also as synthetic resin materials, such as these.

In addition, as another embodiment of the present invention, at least the surface layer of the bearing ribs 336 of the intermediate drum 320 and the layer of the inner circumferential surface of the race groove of the large drum 310, as in the above-described embodiment, the liquid crystal polymer or the aromatic polyimide It is good also as synthetic resin materials, such as resin. Thus, the frictional force between the middle drum 320 and the large drum 310 is reduced. Therefore, the force which mutually abuts with the fitting groove of the intermediate drum press member to which the rotary stopper member 337a of the bobbin case 337 detachably fixed to the intermediate drum 320 and the rotary stopper member 337a are fitted. This becomes small, and it is possible to prevent a large tension from acting on the needle thread 346 when the needle thread 346 exits between the rotary stopper member 337a and the fitting groove. This can improve the quality of the sewing product.

The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely a mere example in all respects, and the scope of the present invention is set forth in the claims, and is not limited in the text of the specification.

In addition, all the deformation | transformation and a change which belong to the equal range of a claim are within the scope of this invention.

Claims (11)

Drum used for sewing sewing machines; An inner drum formed with a bearing rib extending in the circumferential direction at an outer circumference thereof; An outer drum rotatably surrounding it in a circumferential direction; The inner peripheral portion of the outer north is formed with a race groove extending in the circumferential direction; The bearing rib fits into the race groove such that the outer surface layer of the bearing rib faces the inner surface layer of the race groove; One of the outer surface layer and the inner surface layer is formed of steel, and the other of the outer surface layer and the inner surface layer is between the outer surface layer and the inner surface layer when the outer drum rotates with respect to the inner drum. A sewing sewing book, characterized in that the friction between them when the industrial sewing oil is not interposed is made of a liquid crystal material which is less than the friction when the industrial sewing oil is interposed. The sewing sewing book according to claim 1, wherein the outer surface layer is made of a liquid crystal polymer material. The sewing sewing book according to claim 1, wherein the inner surface layer is made of a liquid crystal polymer material. 2. The bearing rib of claim 1, wherein the bearing rib includes a thread release portion, a metal rib portion having a thread separation portion circumferentially spaced from the thread release portion, and a covering member formed of the liquid crystal polymer material while forming the outer surface layer. And the covering member is integrally fixed to the metal rib portion except for the seal separating portion. Drum used for sewing sewing machines; An inner drum formed with a bearing rib extending in the circumferential direction at an outer circumference thereof; An outer drum rotatably surrounding it in a circumferential direction; The inner peripheral portion of the outer north is formed with a race groove extending in the circumferential direction; The bearing rib fits into the race groove such that the outer surface layer of the bearing rib faces the inner surface layer of the race groove; One of the outer surface layer and the inner surface layer is formed of steel, and the other of the outer surface layer and the inner surface layer is between the outer surface layer and the inner surface layer when the outer drum rotates with respect to the inner drum. A sewing sewing book, characterized in that the friction between them when the industrial sewing oil is not interposed is made of an aromatic polyimide resin material which is less than the friction when the industrial sewing oil is interposed. 6. The sewing sewing book according to claim 5, wherein said outer surface layer is made of an aromatic polyimide resin material. 6. The sewing sewing book as claimed in claim 5, wherein said inner surface layer is made of an aromatic polyimide resin material. 6. The bearing rib according to claim 5, wherein the bearing rib includes a thread release portion, a metal rib portion having a thread separation portion circumferentially spaced from the thread release portion, and a covering member formed of the liquid crystal polymer material while forming the outer surface layer. And the covering member is integrally fixed to the metal rib portion except for the seal separating portion. Drum used for sewing sewing machines; An inner drum formed with a bearing rib extending in the circumferential direction on the outer circumference; An outer drum rotatably circumferentially surrounding said inner drum; The bearing rib is composed of a thread release portion, a metal rib portion having a thread separation portion circumferentially spaced from the thread extraction portion, and a covering member to be integrally fixed to the metal rib portion except for the seal separation portion; An inner circumferential portion of the outer drum is formed with a race groove extending in the circumferential direction and having an inner surface layer made of steel; The bearing rib is fitted into the race groove such that the outer surface layer of the bearing rib formed by the covering member faces the inner surface layer of the race groove; The covering member forming the outer surface layer has an industrial sewing machine in which friction between them when the outer drum rotates with respect to the inner drum does not interpose an industrial sewing oil between the outer surface layer and the inner surface layer. A sewing sewing machine book, characterized in that formed from a synthetic resin material that is less than the friction when interposing oil. The sewing sewing book according to claim 9, wherein the synthetic resin material comprises a liquid crystal polymer. The sewing sewing book according to claim 9, wherein the synthetic resin material comprises an aromatic polyimide resin material.