KR101698062B1 - Looper mechanism for buttonhole sewing machine - Google Patents

Abstract

The invention relates to a looper mechanism (10) of a buttonholing machine (1). The looper mechanism (10) includes two loopers (11, 12) which catch a sewing thread to form a loop, two spreaders (20, 30) which expand the loop of the sewing thread, a looper base (60) which is supported below a sewing needle (3) so as to be turnable about a centerline extending in a vertical direction (Z), a looper mount (70) on which the loopers (11, 12) and the spreaders (20, 30) are mounted and which is swingably supported on the looper base (60) such that the loopers (11, 12) and the spreaders (20, 30) move toward and away from the up-down movement path of the sewing needle (3), and a spreader cam (40) which is swingably supported on the looper base (60) to give a rotation movement to each of the spreaders (20, 30) to expand the loop. The looper mechanism (10) is characterized by further comprising a lubricant oil feeding member (90) which is brought into contact with the contact portion (23, 33) of each of the spreaders (20, 30) in accordance with the swinging of the looper mount (70) to provide a lubricant oil to the contact portion (23, 33), wherein the lubricant oil feeding member (90) is fixedly equipped on the looper base (60).

Description

{LOOPER MECHANISM FOR BUTTONHOLE SEWING MACHINE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a looper mechanism of a buttonhole sewing machine.

Conventionally, as disclosed in, for example, Patent Document 1, a looper mechanism is known, which is disposed at a position directly below a needle bar in a sewing machine bed portion of an eyelet stitch sewing machine, and is supported so as to be pivotable in a concentric manner with the needle bar.

Fig. 12 shows a conventional looper mechanism.

The looper mechanism 100 includes a looper base (not shown), a looper attachment base 102 that swings in the horizontal direction by a support shaft 101 oriented horizontally at an upper portion of the looper base, And a spreader cam 103 which is installed in parallel with the support shaft 101 and which swings by the support shaft 101.

Loopers (not shown) are provided on the left and right sides of the looper attachment base 102 with the upper and lower longitudes of the sewing needles interposed therebetween. Spreaders 106 and 107 are disposed in the vicinity of the loopers, respectively. The spreader cam 103 is provided with a pair of left and right cam portions 104 and 105 extending upward and the looper attachment portion 102 and the spreader cam 103 are arranged in a manner synchronized with the vertical movement of the sewing needle So as to be shifted in opposite phases from each other.

On the other hand, each of the spreaders 106 and 107 is pivotally supported by the looper attaching base 102, and thread hooking portions 106a and 107a for widening the loop of the thread are formed on one side in the radial direction And contact portions 106b and 107b, which are in contact with the cam portions 104 and 105 of the spreader cam 103, are provided successively on the opposite side. When the thread hooking portion 106a of the spreader 106 comes close to the sewing needle, the contact portion 106b of the thread hooking portion 106a of the spreader 106 is moved in the opposite direction, The rotation of the thread catching portion 106a is given to the cam portion 104 of the spreader cam 103 to extend the loop of the thread captured by the loop. Similarly, when the thread catching portion 107a of the spreader 107 comes close to the sewing needle, the contact portion 107b abuts against the cam portion 105 of the spreader cam 103, and the rotation of the thread catching portion 107a is imparted This extends the loop of the thread captured by the looper.

In the conventional looper mechanism 100, as the contact portions 106b and 107b of the respective spreaders 106 and 107 repeatedly make sliding contact with the cam portions 104 and 105 of the spreader cam 103, wear is prevented The supply of lubricant was indispensable to ensure the original activity of the action.

Therefore, in general, lubricant was manually supplied to the sliding contact portion.

In the looper mechanism 100 described in Patent Document 1, lubricant supply grooves 108 and 109 are formed on one flat surface of the spreader cam 103 along each of the cam portions 104 and 105, and the spreader cam 103 The lubricating oil supplied from the oil core 110 was further supplied to the upper and lower cam portions 104 and 105 through the respective supply grooves 108 and 109 by using the centrifugal force at the time of swinging of the oil.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2007-061326

However, in order to supply the lubricating oil manually, a troublesome operation is required, which is performed by opening the looper mechanism in the sewing machine bed, thereby significantly lowering the working efficiency.

Since the looper mechanism 100 disclosed in Patent Document 1 has a structure in which lubricating oil is supplied to the cam portions 104 and 105 through the supply grooves 108 and 109 formed along substantially the vertical direction, There is a problem that lubricating oil is scattered above the cam 103 due to the centrifugal force of the swing motion of the cam 103. A needle plate (not shown) is disposed above the spreader cam 103, and a lubricant adheres to the thread passing through the needle plate, thereby contaminating the object to be picked, resulting in deterioration in quality Respectively.

SUMMARY OF THE INVENTION An object of the present invention is to prevent deterioration of working efficiency or to suppress adhesion of lubricating oil.

According to a first aspect of the present invention, there is provided a sewing machine comprising: two loopers for capturing a sewing room to form a loop; two spreaders for widening a loop of the sewing room; and a looper supported rotatably about a center line along the vertical direction, And the looper and each spreader are disposed opposite to each other with the upper and lower longitudes of the sewing needles interposed therebetween, and the looper and the spreader can swing on the looper base so that the looper and each spreader come into contact with and move away from the upper and lower longitudinals of the sewing needle And a pair of spur gears which are pivotally supported on the looper foundation and which have two cam portions abutting against the contact portions of the respective spreaders and which impart a pivoting action for widening the loops to the respective spreaders, Wherein the spreader cam is provided with a cam, and the spreader cam is provided on one of the spreaders moved forward toward the sewing needle A looper mechanism of buttonhole-driving machine to give it the same operation, characterized in that contact by said looper attached single swing fit the contact portion of each of the spreader a secure the lubricating oil supply member for applying the lubricant to the looper foundation equipment.

The present invention according to claim 2 is characterized in that the lubricant supply member is disposed at a position where the respective spreaders come into contact with each other by moving in a direction away from the upper and lower diameter paths of the sewing needles.

The invention according to claim 3 is characterized in that the lubricating oil supply member is arranged to apply lubricating oil to each spreader at a stop position in the rocking motion of the looper attachment.

The present invention according to claim 4 is characterized in that each of the spreaders is provided on a side opposite to the threading portion for widening the loop by hanging the sewing thread and the contact portion about the pivotal support shaft.

The invention according to claim 5 is characterized in that grooves are formed in the contact portions of the respective spreaders.

According to a sixth aspect of the present invention, the contact portion of each of the spreaders is provided with a penetrating member capable of penetrating the lubricating oil.

According to a seventh aspect of the present invention, the contact portion of each of the spreaders includes a roller which is in contact with the cam portion of the spreader cam and rolls.

The invention according to claim 8 is characterized in that it comprises a lubricant tank arranged away from the lubricant supply body.

According to a ninth aspect of the present invention, an oil core (oil core) for axially supporting the looper attachment block and the spreader cam with a common support shaft and supplying lubricant to the support shaft is disposed in a receiving hole formed in the support shaft And the oil core is arranged to be in contact with the lubricant supply body and to receive the lubricant.

According to a tenth aspect of the present invention, there is provided a lapping machine comprising: a first felt, which is connected to the lubricating oil tank and is fixed to an equipment frame,

And an arc-shaped second felt, which is connected to the lubricant supply body and is fixed to a lower surface of the looper base, and is arranged concentrically with a turning center of the looper base, wherein the first felt and the second felt are arranged vertically .

According to the invention as set forth in claim 1, since lubricating oil is supplied to the contact portions of the respective spreaders by the lubricating oil supply member fixedly mounted on the looper base, unlike the case where lubricating oil is supplied using the spreader cam performing the swinging operation, It is possible to suppress the scattering of the lubricating oil above the lubricating oil and to reduce the contamination of the sewing thread and the lubricating oil by the lubricating oil and to improve the quality.

In addition, since each spreader that performs contact and separation movement with respect to the sewing needle is supplied with lubricating oil from the lubricating oil supply body due to the swinging motion of the looper attaching base, even if the lubricating oil is scattered in the moving direction of the spreader, So that the contamination by the lubricating oil of the sewing thread and the workpiece can be reduced and the quality can be improved.

According to a second aspect of the present invention, the lubricating oil supply member is disposed at a position where the lubricating oil supply member comes into contact with each other as the respective spreaders move in a direction away from the sewing needle. Since each of the spreaders comes into contact with the cam portion of the spreader cam when moving in the direction approaching the sewing needle, the spreaders are brought into contact with the lubricant supplying body when moving in the opposite direction so that interference between the lubricant supplying body and the spreader cam can be avoided So that the smooth operation of each spreader can be maintained.

According to a third aspect of the present invention, the lubricating oil supply member is disposed so as to apply lubricating oil to each spreader at a stop position in the swinging motion of the looper attachment. Therefore, scattering of the lubricating oil at the time of application can be further reduced, so that the contamination by the lubricating oil of the sewing thread and the workpiece can be further reduced, thereby further improving the quality.

According to a fourth aspect of the present invention, since the yarn hooking portions and the abutting portions of the respective spreaders are provided on opposite sides of the pivotal support shaft, the lubricant does not move toward the yarn hooking portion by the pivotal motion of the spreader, The contamination by the lubricating oil can be further reduced, and the quality can be further improved.

According to the invention as set forth in claim 5, since the grooves are formed in the contact portions of the respective spreaders, the supplied lubricating oil spreads along the grooves, and the contact portions can be effectively slid over a wide range.

Further, since the lubricating oil can be retained in the groove, it is possible to lubricate over a long period of time.

According to a sixth aspect of the present invention, since the contact portion of each spreader is provided with the penetrating member, lubricant can be retained in the penetrating member, so that the lubricant can be lubricated over a long period of time.

According to a seventh aspect of the present invention, since the contact portions of the respective spreaders are provided with rollers, abrasion due to contact with the cam portion of the spreader can be further reduced, and furthermore, smooth pivotal motion of the spreader can be further realized.

According to the present invention, since the lubricating oil tank is provided, it is not necessary to directly supply the lubricating oil to the lubricating oil supplying body, and the lubricating oil tank can reduce the oiling frequency for the tank.

According to the invention recited in claim 9, since the oil core in the support shaft comes into contact with the lubricant supplying body and is supplied with the lubricating oil, the lubrication operation for the support shaft does not need to prepare a lubricant route unique to the support shaft, Reduction of the number of components such as reduction, refueling means, and the like can be achieved.

The invention according to claim 10 is capable of reliably supplying lubricating oil to the lubricating oil supply body even when the looper base is turning.

(Overall Configuration of Embodiment)

1 to 9, a looper mechanism 10 of an eyelet stitch sewing machine 1 which is a buttonhole sewing machine according to an embodiment of the present invention will be described.

1, the looper mechanism 10 includes a needle bar 4 in the bed portion 2a of the machine frame 2 of the eyelet stitch sewing machine 1 and a needle bar 4 for holding the sewing needle 3, And is disposed at a position below. In order to perform the eyelet buttonhole stitching, the needle bar 4 is designed to be capable of performing needle vibrations with a predetermined angle inclination from the above with reference to the state of the needle bar 4 in the vertical direction, and at the same time, And is supported so as to be able to pivot about the vertical axis of FIG. The looper mechanism 10 is also supported in the bed portion 2a so that the looper bracket 60, which will be described later, can pivot concentrically with the needle bar 4.

In the following description, the vertical direction is the Z-axis direction, the longitudinal direction of the bed portion 2a is the Y-axis direction orthogonal to the Z-axis direction, and the Y-axis direction is orthogonal to both the Y- Direction is set as the X-axis direction.

The looper mechanism 10 includes a left looper 11 for capturing an upper thread as a sewing thread to form a loop and entangling a lower thread as a sewing thread to perform a double loop sewing operation and a left looper 11 A left side spreader 20 for widening the loop of the upper thread in parallel with the double round bar; a right looper 12 for picking up the upper thread and performing a single thread loop; A right spreader 30 for widening the loops of the upper thread at the time of rounding the single thread and a loopper as a looper base which is rotatably supported about the same center line as the needle bar 4 parallel to the Z- The brackets 60 and the left and right loopers 11 and 12 and the left and right spreaders 20 and 30 are arranged opposite to each other with the upper and lower longitudes of the sewing needles 3 interposed therebetween, So that the spreaders 20 and 30 contact and move away from the upper and lower longitudes of the sewing needles 3 A spreader cam 40 for pivoting the looper bracket 60 to pivotally support the looper bracket 60; a spreader cam 40 for imparting a pivotal motion for widening the loops to the left and right spreaders 20, 30; And a lubrication mechanism 50 for supplying lubricating oil to each part of the looper mechanism 10. The lubrication mechanism 50 is provided with a drive mechanism for applying a sewing operation to each of the spreaders 20 and 30,

(Looper bracket)

2 to 5, the looper bracket 60 includes a shaft portion 61 located at the lower portion thereof and a toe portion 62 located at the upper portion thereof, and the shaft portion 61 includes a bearing (Not shown). As described above, the shaft portion 61 is concentric with the needle bar 4 at the reference position, and the needle bar 4 and the shaft portion 61 of the looper bracket 60 can rotate coaxially along the Z- Respectively. The shaft portion 61 is formed in a cylindrical shape with its central portion penetrating vertically.

The toe portion 62 includes a circular base portion 63 which is located below the base portion 63 and is integrally formed with the shaft portion 61 and a rising plate portion 64 which is provided on the upper surface of the base portion 63, And a supporting shaft 66 provided between the rising plate portion 64 and the shaft supporting portion 65 is provided on the upper surface of the base portion 63 and near the front surface of the base portion 63 .

The looper bracket 60 of the looper mechanism 10 is pivotally supported so that the state in which the support shaft 66 is parallel to the Y axis direction and the shaft support portion 65 is located on the front side is the basic posture All the substrates described on the basis of the X, Y, and Z axis directions in the description of the above embodiment are arranged so that the direction, orientation, and position in the case where the looper bracket 60 is in the basic posture .

The base portion 63 is formed in a substantially disc shape concentric with the shaft portion.

The standing plate portion 64 is integrally formed with the base portion 63 and is formed in a substantially flat plate shape along the X-Y plane. A not-shown needle plate is fixedly mounted on the upper end of the rising plate portion 64.

The shaft supporting portion 65 is fixed to the base portion 63 in a state standing on the front side thereof so as to face the standing plate portion 64. [

In the upper portion of the rising plate portion 64 and the shaft supporting portion 65, insertion holes of the support shaft 66 are formed at positions which are parallel to each other in the Y axis direction. The supporting shaft 66 inserted into each of the insertion holes of the standing plate portion 64 and the shaft supporting portion 65 is fixed to the standing plate portion 64 side by a blind screw 67 .

The support shaft 66 has a function of supporting the looper attachment 70 and the spreader cam 40 in a rockable manner. A receiving hole 66a of the oil core 57 to be described later is formed along the longitudinal direction at the center of the supporting shaft 66. The receiving hole 66a is formed so that the rising plate portion 64 side And the shaft supporting portion 65 side is closed. A plurality of through holes 66b are formed from the receiving hole 66a toward the outer peripheral surface of the support shaft 66 and the looper attachment 70 and the spreader cam 40 are smoothly connected to the support shaft 66 So that lubricating oil can be supplied from the oil core 57 so as to be swingable.

(Spreader cam)

6 is an exploded perspective view around the spreader.

6, the spreader cam 40 is formed in a flat plate shape, and a support hole 41 through which the support shaft 66 is inserted perpendicularly to the plate surface is formed, and the inner peripheral surface of the support hole 41 So that the spreader cam (40) can swing in sliding contact with the outer peripheral surface of the support shaft (66).

The spreader cam 40 is provided with two extending portions 42 and 43 extending in two directions in the radial direction at a predetermined opening angle around the support hole 41, As shown in Fig. A left side cam portion 44 and a right side cam portion 45 are formed at the end portions of the two extending portions 42 and 43 which are mutually outward. The left side cam portion 44 is provided with a pivotal motion for widening the loop by abutting against the left side spreader 20 by reciprocating swinging motion of the spreader cam 40. The right side cam portion 45 is provided on the left side of the spreader cam 40, And pivots to contact the right side spreader 30 by the reciprocating swing motion to widen the loop.

The spreader cam 40 is provided with an input arm portion 46 extending in a direction different from the extending portions 42 and 43. A reciprocating swinging operation is performed by the drive mechanism from the input arm portion 46 .

(Looper, spreader and looper attachment)

The looper attachment 70 has a cylindrical insertion portion 71 through which the support shaft 66 is inserted at the lower portion thereof and supports the left looper 11 and the left spreader 20 Shaped support portions 72 and 73 for supporting the right looper 12 and the right spreader 30 and an input arm portion 71 for imparting reciprocating motion from the drive mechanism to the looper attachment 70 74, which are integrally formed.

The insertion passage portion 71 has a cylindrical shape and the inner peripheral surface of the insertion passage portion 71 is in sliding contact with the outer peripheral surface of the support shaft 66 so that the looper attachment base 70 can swing.

The support portions 72 and 73 are respectively disposed along two radial directions at a predetermined opening angle with respect to the insertion passage portion 71, Is set to be slightly smaller than the opening angle of the extension portions (42, 43).

The looper attachment 70 has its reciprocating swing angle so that the upper and lower longitudes of the sewing needles 3 parallel to the Z-axis direction are always located between the two support portions 72, 73.

The upper surface of each of the support portions 72 and 73 is formed with a flat surface perpendicular to the extending direction of each of the support portions 72 and 73. The upper surface of the left looper 11, And the right looper 12 and the right spreader 30 are equipped on the flat surface of the support portion 73. [

The left looper 11 is rigidly fixed to the support portion 72 in a state in which the leading end portion for capturing the upper thread extends toward the upper and lower radial road side (right looper 12 side) of the sewing needle, 12 is fixed to the support portion 73 in a state in which the tip portion for capturing the upper thread extends toward the upper and lower radial path side (left looper 11 side) of the sewing needle.

6 and 7, in the left spreader 20, the thread hanging portion 21 for widening the upper thread loop extends toward the upper and lower radial path side (right side spreader 30 side) of the sewing needle, Is rotatably supported around the shaft portion (22) with respect to the support portion (72) for a function of rotating the thread catching portion (21) to widen the loop. Similarly to the right spreader 30, the thread hanging portion 31 for widening the upper thread loop extends toward the upper and lower radial path side (left side spreader 20 side) of the sewing needle. (Not shown) with respect to the support portion 73 for a function of rotating the support portion 73 to widen the loop.

The left side spreader 20 has a contact portion 23 extending toward the opposite side of the thread hanging portion 21 with respect to the shaft portion 22. The contact portion 23 has a front side, The left side cam portion 44 of the spreader cam 40 abuts against the pressing force so that the left side spreader 20 performs a pivot action for extending the loop . Two groove portions 24 are formed in the lateral direction on the rear surface side of the contact portion 23 (on the side of the contact surface with the spreader cam 40). The lubricant is supplied to the abutting portion 23 of the left spreader 20 by a lubrication mechanism to be described later so that the supplied lubricating oil can spread evenly along the groove portion 24 and lubricant can be retained in the groove portion 24 .

The right spreader 30 also has a shaft portion and a contact portion 33 which are not shown and have the same structure as the left spreader 20. The contact portion 33 is connected to the rear side by a torsion coil spring 76 And the right side cam portion 45 of the above-described spreader cam 40 abuts and pushes against the pressing force, so that the right side spreader 30 is adapted to perform a pivoting operation for extending the loop. Further, two not-shown grooves are formed laterally in the contact portion 33 of the right side spreader 30 so that the lubricating oil supplied by the lubricating mechanism can be evenly spread and retained.

Reference numerals 25 and 35 are stoppers for preventing the left and right spreaders 20 and 30 from being separated from each other.

The looper attachment 70 is provided with a reciprocating swing motion from the input arm portion 74 by a drive mechanism. Here, the timing of the reciprocating rocking motion applied to the looper attachment 70 and the timing of the reciprocating rocking motion imparted to the spreader cam 40 will be described.

8 shows a case in which the right looper 12 performs the forward movement toward the upper and lower needles of the sewing needle. The right cam portion 45 is not pressed against the abutting portion 33 during the forward movement of the right looper 12 and the right spreader 30 by the oscillation of the looper attachment 70, And the right end of the right spreader 30 catch the upper thread and enter the loop and the spreader cam 40 starts to rock to the right in Fig. 33 so that the right spreader 30 is rotated.

The same applies to the left looper 11 and the left spreader 20 although not shown. After the spreading of the loops 11 and stopping the forward movement, the spreader cam 40 starts to swing to the left in Fig. 8, The operation timing is set so that the left cam portion 44 presses the contact portion 23 to rotate the left spreader 20.

(Drive mechanism)

The reciprocating motion of the looper attachment 70 and the spreader cam 40 is realized by the drive mechanism.

The driving mechanism includes a cylindrical louver driving shaft 81 inserted into the through hole of the shaft portion 61 of the louver bracket 60 shown in Fig. 5, and a spreader driving shaft 81 inserted into the inside of the louper driving shaft 81 A link for connecting the louver drive shaft 81 to the input arm portion 74 of the looper attachment 70 and a link for connecting the spreader drive shaft 82 to the input arm portion 46 of the spreader cam 40, A cam mechanism (not shown) for lifting and raising the loupe drive shaft 81 to impart the predetermined rocking motion, and a cam mechanism for raising and lowering the spreader drive shaft 82 to give the predetermined rocking motion And is mainly composed of a cam mechanism (not shown).

Each of the cam mechanisms is constituted by a rotary cam plate of a predetermined shape fixed to a lower shaft rotatably driven by a sewing machine motor that is a sewing drive motor and a vertical switch which engages with the cam to synchronize with the vertical movement of the sewing needle , And each of the drive shafts 81 and 82 is periodically given a predetermined lift operation.

(Oil supply mechanism)

2 to 9, the lubricant supply mechanism 50 includes a lubricant tank 51 for storing lubricant disposed below the looper bracket 60 and disposed at the bottom of the sewing machine bed portion 2a, A first felt 52 which is a disk-like lubricating oil supply member (impregnating member) which abuts against the lower side of the base portion 63 of the lubricating oil tank 60 and is fixed to the machine frame 2, An oil core 53 for supplying lubricant to the first felt 52 and an arc lubricating oil supply member (infiltration member) disposed in an arc-shaped recess 63a provided on the bottom surface of the base portion 63 A third felt 90 which is a lubricant supply member (infiltration member) provided on the upper side of the back surface side of the standing plate portion 64 of the looper bracket 60 and the third felt 90 which is a lubricant supply member An oil core 56 for supplying lubricating oil from the second felt 54 to the third felt 90, and a fixing plate 55 fixed to the rising plate portion 64, And oil cores 57, 58 and 59 as lubricant supply members (impregnating members) for supplying lubricating oil to one end portion of the third felt 90 to supply lubricating oil to the respective surrounding portions.

The lubricant tank 51 is a sealed container disposed at a position away from the third felt 90 and having a cover that can be opened and closed. By peeling the cover, lubricating oil can be supplied to the inside.

The first felt 52 is disposed coaxially with the center of rotation of the looper bracket 60 and the arc-shaped second felt 54 is disposed in the same plane as the lower surface of the looper bracket 60 or slightly protruded downward have. The first felt 52 and the second felt 54 are always brought into contact with each other even when the second felt 54 moves by the turning operation of the looper bracket 60, Lubricating oil is supplied.

The oil core 56 is inserted into the through hole 64a passing through the upstanding plate portion 64 through the upstanding plate portion 64. The upper end portion of the oil core 56 comes into contact with the inner surface of the third felt 90, 54) to the third felt (90).

The third felt 90 has a body portion 91 that contacts the back surface of the standing plate portion 64 and left and right side portions 92 and 93 located on the left and right sides of the body portion 91. The body portion 91 and the left and right side portions 92 and 93 are formed by bending a single plate-like felt material and are formed in a substantially 'U' shape when viewed from above.

The left side surface portion 92 swings in the direction in which the left spreader 20 is separated from the upper and lower path of the sewing needle 3 by the looper attaching stand 70 and stops almost at the maximum spacing position, So that the side edge portion of the surface portion 92 is in sliding contact.

Likewise, the right side surface portion 93 is located at a position where the right side spreader 30 swings in the direction away from the upper and lower path of the sewing needle 3 by the looper attachment 70, And the side edge portions of the right side surface portion 93 are in sliding contact with each other.

The felt fixing plate 55 is a sheet of metal formed in substantially the same shape as the third felt 90 and is formed so as to cover substantially the entire outer surface of the third felt 90. Four claws 55a to 55d are provided in the felt fixing plate 55 and the third felt 90 is held so as to maintain a fixed shape by the rigidity of the felt fixing plate 55. [

The felt fixing plate 55 is fixed by screwing to the standing plate portion 64 so that the third felt 90 can be fixed to the looper bracket 60. [

The oil core 57 is housed in the receiving hole 66a in the support shaft 66 described above. The support shaft 66 is inserted into the through hole of the rising plate portion 64 and the end where the receiving hole 66a of the support shaft 66 is opened faces the back surface side of the rising plate portion 64 have. One end of the oil core 57 protrudes from the opening of the receiving hole 66a and is brought into contact with the inner surface of the main body 91 of the third felt 90. Accordingly, lubricating oil is supplied to the oil core 57 from the third felt 90.

The oil cores 58 and 59 are also disposed in a through hole formed in the rising plate portion 64 and contact the various members performing the operation on the front side of the rising plate portion 64 to supply the lubricating oil. One end of each of the oil cores 58 and 59 also protrudes from the back surface side of the standing plate portion 64 and is brought into contact with the inner surface side of the body portion 91 of the third felt 90. The third felt 90 The lubricating oil is supplied.

(Explanation of operation of looper mechanism)

The operation of the looper mechanism 10 constructed as described above will be described.

First, in the oil supply mechanism 50 of the looper mechanism 10, lubricating oil is supplied from the lubricant tank 51 to the first felt 52 through the oil core 53, and lubricating oil is supplied from the first felt 52 to the second felt Lubricating oil is supplied from the third felt 90 to the oil cores 57, 58 and 59 via the oil passages 54 and the oil cores 56 and lubricant is supplied from the third felt 90 to the oil cores 57, The lubricating oil spreads evenly throughout the entire area of the engine.

The sewing machine motor of the eyelet stitch sewing machine 1 is driven by the looper mechanism 10 to move the looper drive shaft 81 and the spreader drive shaft 82 up and down at predetermined timings, And the base 70 and the spreader cam 40 are moved left and right respectively.

At this time, the left looper 11 catches the upper thread from the lowered sewing needle 3 by the swinging motion of the left looper 11 of the looper attachment 70 with respect to the upper and lower sides of the sewing needle upper right And the thread hanging portion 21 of the left spreader 20 also enters the upper thread loop. The left cam portion 44 is brought into contact with the contact portion 23 of the left spreader 20 by the swinging motion of the spreader cam 40 so that the thread catching portion 21 rotates to widen the loop.

On the other hand, as the left spreader 20 advances, the right spreader 30 pivots to the maximum spacing position with respect to the upper and lower stitch lengths of the sewing needle, and at this time, the contact portion 33 contacts the right side portion 93 of the third felt 90 And lubricating oil is applied. The groove portion formed in the contact portion 33 spreads lubricating oil evenly over the contact portion 33, and lubricating oil is retained in the groove portion.

Subsequently, the right looper 12 picks up the upper thread from the lowered sewing needle 3 by the swinging motion of the right looper 12 of the looper attachment 70 with respect to the upper side of the sewing needle upper and lower passages (left side) And the thread hanging portion 31 of the right side spreader 30 also enters the upper thread loop. The right cam portion 45 is brought into contact with the contact portion 33 of the right side spreader 30 by the swinging motion of the spreader cam 40 and the thread hooking portion 31 is rotated to widen the loop. At this time, since lubricating oil is accumulated in the groove portion of the contact portion 33, it smoothly slides even when it comes into contact with the right cam portion 45 of the spreader cam 40,

As the right spreader 30 advances, the left spreader 20 is rotated to its maximum separation position so that the abutting portion 23 is in sliding contact with the left side surface 92 of the third felt 90, And lubricating oil is uniformly spread along the groove portion 24 and lubricating oil is retained in the groove portion 24. As a result, the left spreader 20 slides smoothly against the left cam portion 44, and wear is suppressed.

Then, as the left and right swingings are repeated, the double loop rods and the single-thread rods are alternately made, and the sewing of the buttonholes is performed along the buttonhole holes.

(Effect of Embodiment)

Since the looper mechanism 10 supplies the lubricant to the contact portions 23 and 33 of the respective spreaders 20 and 30 by the third felt 90 fixedly attached to the looper bracket 60, It is possible to suppress the scattering of the lubricating oil to the upper side due to the swinging, and to reduce the contamination caused by the lubricating oil in the sewing chamber and the workpiece, thereby improving the quality .

Since each of the spreaders 20 and 30 that perform contact and separation movement with respect to the sewing needle 3 is supplied with the lubricating oil from the third felt 90 due to the swinging motion of the looper attachment 70, 20 and 30, even if the lubricating oil has scattered in the moving direction of the moving member, the contamination by the lubricating oil of the sewing thread and the workpiece can be reduced and the quality can be improved through this point .

The left and right side portions 92 and 93 of the third felt 90 are disposed at positions where the respective spreaders 20 and 30 abut on each other as they move in the direction away from the upper and lower diameter paths of the sewing needles 3. [ Therefore, when each of the spreaders 20 and 30 makes contact with the cam portions 44 and 45 of the spreader cam 40, interference with the third felt 90 can be avoided, So that smooth operation can be maintained.

The left and right side portions 92 and 93 of the third felt 90 are arranged in the vicinity of the stop position at which the looper attachment 70 is pivoted to the maximum spacing position with respect to the upper and lower paths of the sewing needle, , It is possible to further reduce the contamination by the lubricating oil in the sewing thread and the workpiece, and to further improve the quality of the workpiece. .

Since the thread catching portions 21 and 31 and the contact portions 23 and 33 of the spreaders 20 and 30 are provided on opposite sides of the pivotal support shaft, The lubricating oil does not move to the thread hanging portions 21 and 31 side, and the contamination by the lubricating oil of the sewing thread and the workpiece can be further reduced, thereby further improving the quality.

Since the grooves 24 (the spreaders 30 are not shown) are formed in the contact portions 23 and 33 of the respective spreaders 20 and 30, the supplied lubricating oil spreads along the groove portions, Can be effectively slid over a wide range. Further, since the lubricating oil can be held in the groove portion, it is possible to lubricate over a long period of time.

The oil supply mechanism 50 of the looper mechanism 10 is provided with the lubricant tank 51 and the felt 52, 54, 90 for supplying the lubricating oil to the respective parts and the oil cores 53, 56 to 59 , The lubricating oil spreads evenly by penetration, so that it is not necessary to directly supply the lubricating oil to the supply target position, and the lubricating oil tank 51 can reduce the frequency of supplying oil to the tank.

Further, by using the felt material which is the infiltrating member as the lubricating oil supplying member, it is possible to lubricate the spreaders 20 and 30 while retaining the lubricating oil for a long period of time by infiltrating the lubricating oil. Therefore, the frequency of replenishment of the lubricating oil to the lubricating oil supply body can be reduced.

Since the oil core 57 in the support shaft 66 comes into contact with the third felt 90 and is supplied with the lubricating oil, the lubrication operation to the support shaft 66 causes the support shaft 66 to have its own lubricant supply path There is no need to prepare, and it is possible to reduce the burden of the lubrication operation and reduce the number of components such as the oil supply means.

(Other)

In the oil supply mechanism 50 of the looper mechanism 10, a tube or a pipe (tubular body) may be used instead of an oil core or other felt for supplying the lubricant to the third felt 90.

10, a felt material 24A, which is a penetrating member, may be disposed in the contact portions 23 and 33 instead of the groove portions formed in the respective spreaders 20 and 30. (In Fig. 10, And the illustration of the right side spreader is omitted). This felt material 24A can be held while spreading the lubricant evenly as in the case of the groove portion.

11, the rollers 24B may be arranged so as to expose a part of the outer circumferential surface of the contact portions 23 and 33 in place of the grooves formed in the respective spreaders 20 and 30. (In Fig. 11, Only the left spreader is illustrated, and the right spreader is omitted).

This roller 24B can further reduce abrasion due to contact between the contact portions 23 and 33 of the respective spreaders 20 and 30 and the cam portions 44 and 45 of the spreader cam, 30) can be realized.

1 is a side view of an eyelash stitch sewing machine.

2 is a perspective view of the looper mechanism;

Fig. 3 is a perspective view showing a main configuration of the looper mechanism viewed obliquely from above on the front side. Fig.

Fig. 4 is a perspective view showing the rear side and the side face of the looper mechanism as viewed obliquely from below. Fig.

5 is a cross-sectional view of a section along the Y-Z plane through the center of revolution of the looper bracket;

6 is an exploded perspective view of the periphery of the spreader of the looper mechanism.

7 is a perspective view of the left side spreader.

8 is a plan view of the looper mechanism.

Fig. 9 is an exploded perspective view showing the rear side and the side face of the looper mechanism viewed obliquely from above. Fig.

10 is a perspective view showing another example of the left spreader.

11A is a perspective view of another example of the left spreader, and FIG. 11B is a sectional view of the contact portion of the left spreader.

12 is an exploded perspective view of a conventional looper mechanism.

Description of the Related Art [0002]

1: Eyelet stitch sewing machine (buttonhole sewing machine)

10: looper mechanism

11: Left looper

12: right looper

20: left spreader

21: Thread hanger

22: Shaft (pivot support shaft)

23:

24:

24A: Felt material

24B: Rollers

30: Right spreader

31: thread hook part

33:

40: spreader cam

44: Left cam portion

45: Right cam portion

50: refueling mechanism

53, 56, 57, 58, 59: Oil core

51: Lubricant tank

52: First felt (lubricating oil supply body)

54: Second felt (lubricating oil supply body)

60: Looper bracket (Looper base)

70: Looper attachment

90: Third felt (lubricant supply body, infiltration member)

Claims (10)

Two loopers 11 and 12 for capturing a sewing thread to form a loop, Two spreaders (20, 30) for widening the loop of the sewing thread, A looper base (60) rotatably supported on the basis of a center line along the vertical direction from below the sewing needle, Each looper and each spreader being opposed to each other with the upper and lower pathways of the sewing needle interposed therebetween, and the looper and each spreader being rotatably supported on the looper foundation so that the looper and each spreader come into contact with and move away from the upper and lower longitudinals of the sewing needle A looper mount 70, And a spreader cam (40) supported on the looper base in a rockable manner and having two cam portions abutting against the contact portions of the respective spreaders, and imparting to the respective spreaders a pivoting motion for widening the loops, Wherein the spreader cam is configured to impart a turning operation to one of the spreaders moved forward toward the sewing needle, As a looper mechanism of a sewing machine for a buttonhole, A lubricating oil supply body 90 for applying lubricating oil by abutting against the contact portions of the respective spreaders by the rocking of the looper attachment base is fixedly fixed to the looper foundation, Wherein the lubricant supply member is disposed at a position where the lubricant supply members are in contact with each other by moving in a direction in which the respective spreaders fall away from the upper and lower diameter paths of the sewing needles. Two loopers 11 and 12 for capturing a sewing thread to form a loop, Two spreaders (20, 30) for widening the loop of the sewing thread, A looper base (60) rotatably supported on the basis of a center line along the vertical direction from below the sewing needle, Each looper and each spreader being opposed to each other with the upper and lower pathways of the sewing needle interposed therebetween, and the looper and each spreader being rotatably supported on the looper foundation so that the looper and each spreader come into contact with and move away from the upper and lower longitudinals of the sewing needle A looper mount 70, And a spreader cam (40) supported on the looper base in a rockable manner and having two cam portions abutting against the contact portions of the respective spreaders, and imparting to the respective spreaders a pivoting motion for widening the loops, Wherein the spreader cam is configured to impart a turning operation to one of the spreaders moved forward toward the sewing needle, As a looper mechanism of a sewing machine for a buttonhole, A lubricating oil supply body 90 for applying lubricating oil by abutting against the contact portions of the respective spreaders by the rocking of the looper attachment base is fixedly fixed to the looper foundation, Wherein the lubricant supplying member is arranged to apply lubricating oil to each spreader at a stop position in the swinging motion of the looper attaching base. 3. The method according to claim 1 or 2, Wherein each of the spreaders is provided with a thread hanging portion for widening the loop by hanging the sewing thread and the contact portion being provided on opposite sides of the turn supporting shaft with respect to each other. 3. The method according to claim 1 or 2, Wherein a groove is formed in the contact portion of each spreader. 3. The method according to claim 1 or 2, Wherein the contact portion of each spreader is provided with a penetrating member capable of penetrating the lubricating oil. 3. The method according to claim 1 or 2, Wherein the contact portion of each spreader is provided with a roller that abuts against the cam portion of the spreader cam and rolls. 3. The method according to claim 1 or 2, And a lubricant tank (51) arranged away from the lubricant supply body. 8. The method of claim 7, And an oil core for supplying lubricant to the support shaft is disposed in a receiving hole formed in the support shaft, Wherein the oil core is disposed so as to be in contact with the lubricant supply body and to be supplied with lubricating oil. 8. The method of claim 7, A first felt in the form of a disk, which is connected to the lubricant tank, is fixed to the device frame and is arranged to face the lower surface of the looper base, And an arc-shaped second felt, which is connected to the lubricant supply body and is fixed to a lower surface of the looper base, and is arranged concentrically with a turning center of the looper base, wherein the first felt and the second felt are arranged vertically And the looper mechanism of the buttonhole sewing machine. delete

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