JP2001300164A - Eyelet hole linking sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eyelet hole linking sewing machine with which smooth needle shogging motion is carried out without the exertion of undue load on the respective members of a needle shogging mechanism and a sewing machine spindle. SOLUTION: This eyelet hole linking sewing machine 1 has a needle shogging mechanism 3 including a needle shogging oscillation body 106 which vertically moves back and forth cooperatively with the sewing machine spindle 44, a needlebar guiding member 60 into which a needle bar 20 is inserted and a needle shogging yoke 200 which consists of a connecting collar 203 having connecting pins 204 and 204 inserted onto an upper part 60b of the needlebar guiding member 60, a supporting shaft 201 inserted to the needle shogging oscillation body 106 and fork parts 200a and 200a for supporting the connecting pins 204 and 204. The surfaces 200b and 200c parallel to each other are formed at the fork parts 200a and 200a so as to face one above the other and the connecting pins 204 and 204 are grasped across angular barrels 210 and 210 so as to be oscillatable along the two surfaces between the two surface facing one above the other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyelet sewing machine having a needle bar vertical drive mechanism and a needle swing mechanism.

[0002]

2. Description of the Related Art A needle bar vertical drive mechanism for vertically driving a needle bar on which a sewing needle is fixed, and a needle swing mechanism for swinging the needle bar right and left in synchronization with the needle bar vertical drive mechanism are provided. There is known an eyelet hole overlock sewing machine that performs overlock sewing around the buttonhole of the eyelet. FIG. 7 shows a main part of a conventionally known needle swinging mechanism of an eyelet buttonhole sewing machine. FIG. 8 is a partially exploded perspective view of FIG. In the swing mechanism shown in FIGS. 7 and 8,
Fixed collar 94, connecting collar 72, needle bar guide member 60,
The needle bar 20 is inserted inside the block portion 66 so as to be vertically movable, and the sewing needle 4 is fixed to the tip of the needle bar 20. The needle bar 20 is connected to a needle bar vertical drive mechanism (not shown) at an upper portion thereof, and is driven vertically.

In the needle swing mechanism shown in FIG. 7, when the connecting rod 97 swings left and right by rotation of a sewing machine main shaft (not shown), the needle swing lever 76 reciprocates around the needle swing shaft 78 in the direction of arrow A. . When the swing lever 76 rotates, the link 105 connected to the long hole 76a of the swing lever 76 moves up and down, and the swing swing body 106 reciprocates up and down (direction B in the figure). I do. Further, the swinging yoke 7 is inserted into the fitting hole 106a (FIG. 8) of the swinging swinging body 106.
Four support shafts 80 are inserted. Here, the support shaft 80
Is defined as an X-axis, and a connecting pin 70,
A straight line passing through 70 is defined as the Z axis. The support shaft 80 is rotatable about the X axis, and is slidable along the X axis direction.

[0004] The tip of the needle swing yoke 74 is bifurcated, and connecting pins 70, 7 protruding from both sides of the connecting collar 72.
The gripping portions 74a and 74a grip the “0”. Here, the gripping portions 74a, 74a are formed in a ring shape with some cutouts, and the connecting pins 70, 70 are formed in a shape in which both side portions of a column are cut off, for the convenience in assembling. It is. That is, after connecting the narrower side of the connecting pins 70, 70 to the notches of the gripping parts 74a, 74a, the connecting collar 72 is rotated 90 degrees, and assembled in the state of FIG. On the other hand, oblique grooves 64 (only one is shown in FIGS. 7 and 8) are formed on both side surfaces of the block portion 66 fixed to the lower portion of the needle bar guide member 60. Guide pins 86, 86 are engaged with these oblique grooves 64, 64, respectively. The connecting collar 72 and the fixed collar 94 are provided above the needle bar guide member 60.
Is attached.

Therefore, when the swinging swinging body 106 moves up and down in the direction B in FIG. 7, the needle bar guide member 60 is also driven up and down via the swinging yoke 74 and the connecting collar 72. Since the guide pins 86, 86 are engaged with the oblique grooves 64, 64 of the block portion 66, the block portion 66 moves up and down while swinging left and right along the direction of the groove. The guide member 60 is swung in the C direction as the needle swinging oscillator 106 moves up and down, and
Is also swung in the same direction.

FIG. 9 shows a state during a swing operation.
As shown in FIGS. 9A and 9B, when the needle bar guide member 60 swings right and left, the horizontal distance of the needle bar guide member 60 with respect to the needle swinging oscillator 106 changes, and the support shaft 80 moves the needle. The oscillating body 106 slides along the X axis with respect to the fitting hole 106a. When the needle bar guide member 60 swings to the left in FIG. 9 (FIG. 9A), the support shaft 80 enters the fitting hole 106a, and the distance between the needle swing rocker 106 and the flange 80a of the support bar 80 becomes L1. And swing rightward (Fig. 9
(B)), the support shaft 80 protrudes from the fitting hole 106a, and the distance becomes L2 larger than L1.

[0007]

Incidentally, the operation of the needle bar vertical drive mechanism may be affected by the vertical movement of the needle swing mechanism. That is, the needle bar 20 is driven by the needle bar vertical drive mechanism.
Is descending, but the needle bar guide member 60 is
Is the case where the needle bar 20 is being raised, and conversely, the needle bar guide member 60 is being lowered.
Although the needle bar 20 is inserted into the needle bar guide member 60 so as to be movable up and down, actually, both mechanisms influence each other, and when the operation directions of both mechanisms are opposite, the X-axis direction of the needle swing yoke 74 The needle swinging yoke 74 and the needle swinging oscillator 1
06, a mechanical twist (moment) occurs,
The smooth movement of the needle swing yoke 74 is hindered. As a result, an excessive force is applied to the support shaft 80 of the needle swing yoke 74 and the needle swing oscillator 106, and as a result, the torque of the sewing machine main shaft increases, and the swing width of the sewing needle 4 may become uneven. Was.

[0008] In addition, as can be seen in FIG. 9, when the needle swings, the connecting collar 72 moves around the Z axis.
The needle swinging yoke 74 rotates while sliding in the holding portions 74a, 74a. As described above, for convenience in assembling, each gripping portion 74a is in the shape of a partially cut-out ring, and each connecting pin 70 is substantially rectangular in cross section.
The contact surfaces between 0 and the grip portion 74a are only the upper and lower surfaces of the connecting pin 70. Therefore, since the contact area is small,
Wear and backlash are likely to occur, and there is a problem in durability. In addition, it is difficult to increase the thickness of the connecting pin 70 to solve this problem due to space limitations.

SUMMARY OF THE INVENTION An object of the present invention is to provide an eyelet overlocking machine that does not apply an unreasonable load to the members of the needle swing mechanism and the main shaft of the sewing machine even if the operation between the needle bar vertical drive mechanism and the needle swing mechanism is deviated. In other words, a smooth swinging motion is performed, and members constituting the swinging mechanism have sufficient durability.

[0010]

In order to solve the above-mentioned problems, the invention according to the first aspect is, for example, as shown in FIGS. 1 to 3, a needle bar having a sewing needle (4) fixed at the tip thereof. (2
0), a needle bar vertical drive mechanism (2) for driving the needle bar in the vertical direction, and a needle swing mechanism (3) for swinging the needle bar in a predetermined direction in a plane perpendicular to the vertical direction, The needle swing mechanism is provided with a needle swing moving body (needle swing rocking body 106) that reciprocates up and down in conjunction with a sewing machine main shaft (44) and a sewing arm (arm 14) so as to be vertically movable. A needle bar guide member (60) which is inserted vertically so as to be freely movable, and which is inserted outside the upper portion (60b) of the needle bar guide member and which is substantially perpendicular to the predetermined direction in a plane perpendicular to the vertical direction. A pair of connecting shafts (connecting pins 204, 2
04), a shaft part (support shaft 201) inserted into the needle swinging body so as to be substantially parallel to the predetermined direction, and each of the pair of connection shafts. Two supporting portions (fork portions 200a, 2
00a) (a needle swing yoke 20)
0), a groove member (block portion 66) provided at a lower end portion of the needle bar guide member and having an oblique groove (64) running obliquely on a side surface, and slidably engaged with the oblique groove, In an eyelet buttonhole sewing machine (1) including an engaging member (guide pins 86, 86) for swinging the needle bar guide member in the predetermined direction as the needle bar guide member moves up and down, the shaft of the connecting shaft support member is provided. The portion is inserted through the needle swinging moving body so as not to move along the predetermined direction, and each support portion of the connecting shaft support member has two surfaces substantially parallel to the predetermined direction and parallel to each other. (200b, 2000c) are formed to face each other,
The connecting shaft is an insertion member (square pieces 210, 210) through which the connecting shaft can be inserted directly or between the two opposing surfaces.
Characterized by being slidably sandwiched via a.

According to the first aspect of the present invention, each support portion of the connecting shaft supporting member for supporting the connecting shaft of the connecting member has two surfaces substantially parallel to the needle swing direction and parallel to each other. The connecting shaft is formed so as to face each other, and the connecting shaft is slidably sandwiched between the two facing surfaces directly or via an insertion member, so that the connecting shaft extends along the two surfaces. It is possible to slide in the needle swing direction. Further, the shaft portion of the connecting shaft support member is inserted into the needle swing moving body so as not to move along the predetermined direction. Therefore, when the needle bar guide member swings in the needle swinging direction, if the distance changes with respect to the needle swinging moving body, the connection shaft slides with respect to the support to cope with the change. Therefore, even if the operation is shifted between the needle bar vertical drive mechanism and the needle swing mechanism as described above,
The effect is absorbed by the sliding motion of the connecting shaft, and no mechanical "torsion" occurs, and the effect on the connecting shaft support member and the needle swinging moving body is extremely small. There is no effect on the main shaft 44 of the sewing machine through the intermediary of the sewing machine, and a smooth swinging motion can be achieved.

Here, the shape of the support portion may be any shape as long as it is formed so as to be substantially parallel to the predetermined direction and two surfaces parallel to each other are opposed to each other. U-shaped or rectangular frame shape. In addition, "directly or through an insertion member through which the connecting shaft can be inserted" means that the connecting shaft itself may be formed in a size that fits exactly between two surfaces, or as in claim 2. You may comprise.

[0013] That is, according to a second aspect of the present invention, in the eyelet buttonhole sewing machine according to the first aspect, for example, as shown in FIGS. The member is a square piece (210, 310, 410) or a roller having a shaft hole having a circular cross section through which the connecting shaft can be inserted. According to the second aspect of the present invention, the connecting shaft is entirely supported by the square top or the roller and has a large contact area. Play is less likely to occur, and sufficient durability can be obtained.

In the eyelet buttonhole sewing machine according to the first or second aspect, as in the third aspect,
Detents (edge 210c, detent members 311 and 41) for preventing the connecting member from rotating about the vertical direction.
1) may be provided. According to the invention described in claim 3,
Since the rotation stopper is provided, the connecting member does not rotate around the vertical direction as an axis. Here, the rotation stopper is a member directly in contact with the supporting portion, that is, the connecting shaft when the connecting shaft is directly sandwiched between the supporting portions, and the square frame when the square top or the roller is interposed as in claim 2. It may be provided on a roller, or may be provided separately from these members.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIGS. 1 to 6, the same reference numerals are given to the same members as those in FIGS. 7 to 9 described above. FIG. 1 shows a needle bar up / down drive mechanism 2 and a needle swing mechanism 3 of an eyelet hole holing machine 1. The eyelet buttonhole sewing machine 1 mainly includes a bed 12, a vertical trunk 13 standing from the left side of the bed 12, and a bed 1 extending from the vertical trunk 13.
Arm (sewing machine arm) provided parallel to 2
The buttonholes 14 are formed on the cloth placed on the cloth feeder 24 on the bed 12 and buttonholes are formed around the buttonholes.

First, the needle bar vertical drive mechanism 2 will be described. The needle bar vertical drive mechanism 2 drives the needle bar 20 having the sewing machine needle 4 fixed at the tip thereof up and down. The needle bar 20 is vertically moved and swung by a free bearing 62 provided at the top of the arm 14. Supported as possible. A needle bar clamp 40 having a pin protruding laterally (in FIG. 1, in a direction perpendicular to the paper surface) is provided at an intermediate portion of the needle bar 20. On the other hand, the vertical trunk 1
Inside 3, a sewing machine main shaft 44, which is rotated and driven by a sewing machine motor (not shown), is provided in a direction perpendicular to the paper surface. A first gear 52 is fixed to the sewing machine main shaft 44. An upper shaft 48 is rotatably provided above the first gear 52 so as to be parallel to the main shaft 44 of the sewing machine.
The second gear 50 is fixed so as to mesh with the first gear 52. An eccentric cam 55 eccentric to the upper shaft 48 is fixed to a side of the second gear 50, and a connecting member 56 having an extension 56a is fitted to the eccentric cam 55.

A vertically moving pin 36 is provided inside the arm 14, and a substantially central portion of a needle bar driving lever 38 is rotatably supported by the vertically moving pin 36. An extension 56a of the connecting member 56 is rotatably attached to one end of the needle bar drive lever 38. A deep hole 38a is provided from the other end 38b of the needle bar drive lever 38 toward the inside, and the shaft of the needle bar upper and lower yoke 110 is inserted into the deep hole 38a. At the tip of the needle bar upper and lower yoke 110,
Ring part 110a formed in a partially cut-out ring shape
Is formed, and the pin of the needle bar holder 40 is engaged with the ring portion 110a. The pins of the needle bar holder 40 are provided on both sides of the needle bar 20, and two ring portions 110a are provided corresponding to the pins, but FIG. 1 shows only one of them.

According to the needle bar vertical drive mechanism 2 having the above-described structure, when the main shaft 44 of the sewing machine rotates, the first gear 52 and the second gear 50 rotate.
The eccentric cam 55 rotates and the extension 56a moves substantially up and down. When the extension portion 56a moves up and down, the needle bar drive lever 38 swings about the vertical movement pin 36, whereby the other end portion 38b moves up and down, via the ring portion 110a of the needle bar up and down yoke 110. The needle bar 20 is driven up and down. The shaft portion of the needle bar upper and lower yoke 110 is slidable in the direction of entry and exit (G direction) with respect to the deep hole 38a, so that the other end 38b of the needle bar drive lever 38 moves up and down. The movement in the left-right direction of FIG. 1 that occurs when the movement is performed is absorbed, and only the vertical movement is transmitted to the needle bar 20. Further, the needle bar upper and lower yokes 110 are rotated in the rotation direction (J
Direction) is slidable with respect to the deep hole 38a, which corresponds to a needle swinging movement of the needle bar 20 in a plane perpendicular to the plane of FIG.

Next, the needle swing mechanism 3 will be described with reference to FIGS.
It will be described based on. Note that FIG. 3 also shows the X axis and the Z axis as in FIG. As shown in FIG. 1, an eccentric cam 96 is fixed to the main shaft 44 of the sewing machine. A swing lever 98 that can swing left and right around a pin 99 is provided below the sewing machine main shaft 44.
Has a forked portion 98a for holding the eccentric cam 96. The eccentric cam 96 is slidable in a state in which the eccentric cam 96 is inscribed in the holding portion 98a. When the eccentric cam 96 rotates in the holding portion 98a by rotation of the sewing machine main shaft 44, the swing lever 98 swings right and left. Has become.

A projecting portion 98b projecting forward is integrally formed on the right arm of the holding portion 98a. One end of a connecting rod 97 is rotatable on the projecting portion 98b via a pin 95. Installed. In the vicinity of the other end of the connecting rod 97, a swinging shaft 78 is provided substantially in parallel with the main shaft 44 of the sewing machine, and a swinging lever 76 formed in a substantially L shape is connected to the swinging shaft 78. It is mounted swingably at the center. The connecting rod 97 and the swing lever 76 are pin 9
3 so as to be rotatable with respect to each other. FIG.
As shown in (1), an elongated hole 76a is formed in the needle swing lever 76, and the upper end of the needle swing link 105 is engaged with the elongated hole 76a. On the other hand, the lower end of the swinging link 105 is rotatably attached to a swinging swinging body (swinging moving body) 106. Projection 1 of needle swinging oscillator 106
Reference numeral 06b denotes a detent for the needle swinging oscillator 106, which is slidably inserted into a groove (not shown).

A guide shaft 107 having both ends fixed to metal bearings 108a and 108b (FIG. 1) is inserted through the needle swinging oscillator 106. Therefore, when the swing lever 98 swings right and left, the connecting rod 97 swings right and left, and the tip of the swinging lever 76 rotates in the direction D in FIG. 106 is a guide shaft 107
Reciprocate up and down along the arrow (direction B in FIG. 2).

As shown in FIGS. 2 and 3, in this embodiment, a needle swing yoke (connection shaft support member) 200 is used in place of the needle swing yoke 74 shown in FIG.
Instead, a connecting collar (connecting member) 203 and a square top (inserting member) 210 are used. Each of the bifurcated ends of the needle swing yoke 200 is further forked into a fork shape to form fork portions (supporting portions) 200a and 200a. The fork portions 200a, 200a are formed with surfaces 200b and 200c which are spaced apart from each other by a predetermined width M and face up and down in parallel with each other. These surfaces 200b and 200c are substantially parallel to the X-axis direction. A support shaft 201 is fixed to the rear part of the needle swing yoke 200, and a notch 201 is formed at the rear end of the support shaft 201 along the circumferential direction.
a is formed. The needle swing yoke 200 inserts the support shaft 201 into the fitting hole 106a of the needle swing oscillator 106,
The C ring 202 is fitted into the notch 201a and attached. Therefore, a rotational movement about the X axis is possible, but an operation in a linear direction along the X axis cannot be performed.

From both sides of the connecting collar 203, cylindrical connecting pins 204, 204 (connecting shaft) project in a horizontal plane (a plane perpendicular to the vertical direction) and perpendicular to the X axis. Notches 204a are formed in the end portions of 204, 204 along the circumferential direction. Further, as shown in FIG.
A concave portion 210a having substantially the same width as the width N of the surfaces 200b and 200c of Oa is formed, and an insertion hole 210b through which the connecting pin 204 can be inserted is formed. Further, in the square top 210, the height from the concave portion 210a to the lower surface is formed to the width M. As shown in FIG. 2, the connecting collar 203 inserts each connecting pin 204 into the insertion hole 210b of the square piece 210, fits the square piece 210 in this state between the surfaces 200b and 200c of the fork part 200a, and further, The C-ring 211 is attached to the notch 204a of the connecting pin 204 from the outside of each square piece 210, so that it is attached to the needle swing yoke 200.

The connecting collar 203 attached to the needle swing yoke 200 in this manner can rotate about the Z axis because each connecting pin 204 can slide with respect to the insertion hole 210b of the square top 210. It is possible. Further, by sliding the corner pieces 210, 210 along the surfaces 200b, 200c, a linear movement in the X-axis direction becomes possible.
The connecting collar 20 centered on the Y axis passing in the vertical direction
3 is not possible by being locked by the edges 210c, 210c defining the recess 210a of the corner piece 210, ie the edges 210c, 210
c is a rotation stopper for Y-axis rotation.

On the lower surface of the arm 14, a large-diameter through-hole (not shown) is formed, and a bearing metal 83 (FIG. 1) is fixed in this through-hole. A rotation bracket 82 is rotatably fitted. The needle bar rotating bracket 82 includes a cylindrical portion 82a, a timing pulley 82b, and two legs 82c (only one of which is shown in FIG. 3) provided below the pulley 82b. The needle bar guide member 60 is provided in the cylindrical portion 82a.
Are vertically interpolated. At this time, the needle bar guide member 6
The block 66, which is fixed to the lower end of the block 0 and has oblique grooves 64 (only one is shown) on both side surfaces, has legs 82c, 82.
c. In this state, the cylindrical portion 82
The connecting collar 203 is extrapolated to the upper part 60b of the needle bar guide member 60 protruding from a, and the fixed collar 94 is extrapolated from above. The connection collar 203 is rotatably sandwiched between the flange 60 a formed in the circumferential direction of the needle bar guide member 60 and the fixed collar 94 along the peripheral surface of the needle bar guide member 60.

The two leg portions 82c are formed with a storage hole 84 penetrating in the lateral direction, and a guide pin 86 is stored in the storage hole 84. The tip of the guide pin 86 is formed to be thin so as to fit into the oblique groove 64 of the block 66, and the other end is formed with a bottomed hole 86a. This hole 8
A compression spring 90 is housed in 6a. And the cross section L
By fixing the holding plate 88 formed in a character shape to the leg portion 82c and closing the hole portion 86a with the tongue piece portion 88a,
The guide pins 86 are pressed against the block portion 66 and slidably engage the oblique grooves 64. Needle bar guide member 60, connecting collar 203 and fixed collar 9
4, a needle bar 20 is inserted so as to be vertically movable.

According to the needle swing mechanism 3 having the above structure, when the main shaft 44 of the sewing machine rotates, the eccentric cam 96 and the swing lever 9 are rotated.
8, the swinging swinging member 106 reciprocates up and down along the guide shaft 107 via the connecting rod 97 and the swinging lever 76 (direction B in FIG. 2). Thus, the needle swinging oscillator 106
The needle bar guide member 60 is also reciprocated up and down by a predetermined amount via the needle swing yoke 200 attached to the needle bar 200 and the connecting collar 203. At this time, since the guide pins 86, 86 are engaged with the oblique grooves 64, 64 of the block 66, the block 66 moves up and down while swinging left and right along the directions of the oblique grooves 64, 64. Therefore, the needle bar guide member 60 is swung in the C direction, and the needle bar 20 is also swung in the same direction with a predetermined width. When the needle bar 20 is driven up and down by the needle bar up / down drive mechanism 2, it is swung in the C direction by the needle swing mechanism for each needle.

According to the above-described eyelet hole drilling sewing machine 1, the tip of the needle swing yoke 200 is parallel to the surface 200b,
When the needle bar guide member 60 swings in the C direction, the needle swinging oscillator 106 and the needle No mechanical “torsion” occurs between the swing yokes 200. This will be described with reference to FIG.

That is, when the needle bar guide member 60 swings right and left due to the needle swing motion, the horizontal distance of the needle bar guide member 60 to the needle swing swinging member 106 changes. In FIG. 9, the support shaft 80 of the swinging yoke 74 slides in the fitting hole 106a of the swinging swinging body 106 to cope with this change. However, in the present embodiment, each corner piece 210 is slid between the surfaces 200b and 200c. When the needle bar guide member 60 is swung to the left in FIG. 4A, the square piece 210 is located at the back of the fork portion 200a. When the needle bar guide member 60 is swung to the right in FIG. 4B, the square piece 210 slides toward the tip end of the fork portion 200a, and the needle bar guide member 60 separates from the needle swing rocking body 106.

Therefore, even if there is a shift in the operation between the needle swinging mechanism and the needle bar vertical drive mechanism, the influence is not affected by the square frame 21.
0 is not absorbed by the sliding motion of the zero and no mechanical “torsion” occurs.
Of the sewing machine main shaft 44 is not increased, and a smooth needle swing motion is possible. That is, by replacing the movement conventionally performed between the swinging yoke and the swinging rocking body with the relationship between the fork portion 200a of the swinging yoke 200 and the square top 210, a smoother swinging movement can be performed. It was done.

In the needle swing mechanism 3, the rotation about the X-axis direction is absorbed by the support shaft 201 of the needle swing yoke 200 rotating and sliding with respect to the fitting hole 106a as in the related art. . In addition, the rotation about the Z axis is absorbed by the rotation of the connection pins 204, 204 in the square pieces 210, 210.

Further, according to the eyelet-hole holing machine 1,
The connecting pins 204, 204 of the connecting collar 203 have their entire peripheral surface supported by the square pieces 210, 210 and have a large contact area.
Abrasion and backlash are less likely to occur even when sliding in the inside 10, and it has sufficient durability.

<Modification> In the present invention, the connecting portion between the swinging yoke and the connecting collar is not limited to the above embodiment. For example, the corner coma is not limited to the shape shown in FIG. 3, and the concave portion may be provided not only on the upper surface but also on the lower surface. Further, the recess may not be provided. Examples in that case are shown in FIGS.

FIG. 5 shows a first modification of the present embodiment. In FIG. 5, members that are completely the same as those in FIGS. 2 and 3 are given the same reference numerals, and descriptions thereof are omitted. In FIG. 5, a square top 310 is used instead of the square top 210. Square top 3
Reference numeral 10 denotes a simple rectangular parallelepiped in which a concave portion such as the square top 210 is not formed. Therefore, the square coma 310 has Y
There is no detent function about the axis. Therefore, the C
Instead of the links 211, 211, the rotation stop member 311
Is used. As shown in FIG. 5B, the rotation stopping member 311 is formed in a U-shape when viewed from below, and the locking pieces 311 a on both sides are fitted into the connecting pins 204.

The support shaft 201 of the swinging yoke 200
An L-shaped member 313 having an L-shaped cross section is fitted in the rear end of the coil spring 312, and one end of a coil spring 312 is hung on the L-shaped member 313. The other end of the coil spring 312 is hung on a central portion below the rotation stopping member 311. The rotation stopping member 311 is moved by the coil spring 312 to the needle swinging oscillator 10.
The force is uniformly applied to the two locking pieces 311a. Therefore, even if the connecting collar 203 tries to rotate around the Y axis, it is returned to a fixed posture by the coil spring 312, and consequently does not rotate.

FIG. 6 shows a second modification. 6, the same reference numerals are given to the same members as those in FIGS. 2 and 3, and the description is omitted. In FIG. 6, similarly to FIG. 5, simple rectangular parallelepiped square pieces 410, 410 are used, and rotation prevention around the Y axis is prevented by the rotation prevention member 411. As shown in FIG. 6B, the detent member 411 has the same shape as the detent member 311, but has a plate-shaped extension 412 that extends further rearward from the center. The locking pieces 411 a on both sides of the rotation stop member 411 are fitted into the connection pins 204.

In FIG. 6, a needle swinging oscillator 107 is used in place of the needle swinging oscillator 106. The needle swinging oscillator 107 is substantially the same as the needle swinging oscillator 106 except that a concave surface 107b is formed on the lower surface thereof along the X-axis direction, and the extension 412 is fitted into the concave surface 107b. I have. A screw hole (not shown) is formed in the concave surface 107b.
On the other hand, the elongated portion 412 has an elongated hole 412a.
The rotation stop member 411 is formed by fixing the shoulder screw 413 to the screw hole of the concave surface 107b via the long hole 412a.
It is attached to the swinging rocking body 107. In addition, the long hole 412 a is formed to have a length that can correspond to the linear movement of the connecting collar 203 along the X axis, and the rotation stopping member 411 slides along the X axis together with the connecting collar 203. I have. The structure of FIG. 6 is a stronger structure than the structure of FIG. 5, and does not rotate even if a force for rotating the connecting collar 203 around the Y axis is applied.

As shown in FIGS. 5 and 6, the fork portion 20 is attached to the square piece 210 as shown in FIG.
It is not necessary to perform the precision processing of forming the concave portion according to the shape of Oa, and the manufacturing is facilitated and the cost is reduced.

In the present invention, if a rotation stop member is provided as shown in FIG. 5 or 6, the insertion member may be a roller having a circular cross section instead of a square piece. Further, the outer diameter of the connecting pin is substantially equal to the width M of the fork portion 200a, and the fork 200
a. In this case, if a rotation stop is not formed on the connecting pin, a rotation stop member as shown in FIGS. 5 and 6 is used.

[0040]

According to the first aspect of the present invention, each supporting portion of the connecting shaft supporting member for supporting the connecting shaft of the connecting member includes:
The two surfaces that are substantially parallel to the needle swing direction and that are parallel to each other are formed so as to face each other, and the connection shaft is slidable between the two facing surfaces directly or via an insertion member. , The connecting shaft can slide in the needle swing direction along the two surfaces. Further, the shaft portion of the connecting shaft support member is inserted into the needle swing moving body so as not to move along the predetermined direction. Therefore, when the needle bar guide member swings in the needle swinging direction, if the distance changes with respect to the needle swinging moving body, the connection shaft slides with respect to the support to cope with the change. Therefore, as described above, even if the operation is displaced between the needle bar vertical drive mechanism and the needle swing mechanism, the effect is absorbed in the sliding motion of the connecting shaft, and a mechanical “torsion” occurs. Never
The influence on the connection shaft supporting member and the needle swinging moving body is extremely small, and there is no influence on the sewing machine main shaft 44 via the needle swinging moving body, thereby enabling a smooth needle swinging motion.

According to the second aspect of the invention, since the entire peripheral surface of the connecting shaft is supported by the square top or the roller and has a large contact area, the connecting shaft slides inside the square top or the roller. Wear and play are less likely to occur, and sufficient durability can be obtained.

According to the third aspect of the present invention, since the rotation stopper is provided, the connecting member does not rotate around the vertical direction.

[Brief description of the drawings]

FIG. 1 is a diagram showing an internal mechanism of an eyelet buttonhole sewing machine as an example of the present invention.

FIG. 2 is a view showing a main part of a needle swing mechanism of the eyelet buttonhole sewing machine of FIG. 1;

FIG. 3 is an exploded perspective view of a main part of the needle swing mechanism.

FIG. 4 is a view for explaining sliding movement of a connecting pin and a square piece in a needle swing operation.

5A and 5B are diagrams showing a modification of the rotation stopping member of the connecting collar, wherein FIG. 5A is a side view and FIG. 5B is a bottom view.

FIGS. 6A and 6B are diagrams showing a second modification of the rotation stop member of the connecting collar, wherein FIG. 6A is a side view and FIG. 6B is a bottom view.

FIG. 7 is a view showing a main part of a needle swing mechanism in a conventional sewing machine.

FIG. 8 is an exploded perspective view of the needle swing mechanism of FIG. 7;

FIG. 9 is a view for explaining the operation of a needle swing yoke in the needle swing mechanism of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 eyelet overhole sewing machine 2 needle bar vertical drive mechanism 3 needle swing mechanism 4 sewing machine needle 12 bed 13 vertical trunk 14 arm 20 needle bar 44 sewing machine spindle 60 needle bar guide member 64 inclined groove 66 block (groove member) 86, 86 Guide pin (engaging member) 106, 107 Needle swinging swinging body (needle swinging body) 200 Needle swinging yoke (connection shaft support member) 200a Fork portion (support portion) 200b, 200c Surface 201 Support shaft (shaft portion) 203 Connection collar (connection member) 204 Connection pin (connection shaft) 210 Square piece (insertion member) 210c Edge (rotation stop) 310, 410 Square piece (insertion member) 311 411 Rotation stop member (stop rotation)

Claims (3)

[Claims] A needle bar having a sewing machine needle fixed at a tip thereof; a needle bar vertical drive mechanism for vertically driving the needle bar; and a needle bar swinging in a predetermined direction in a plane perpendicular to the vertical direction. A needle swinging mechanism, wherein the needle swinging mechanism includes a needle swinging moving body that reciprocates up and down in conjunction with a main shaft of the sewing machine, and is provided on the sewing machine arm so as to be vertically movable, and a needle bar is inserted therein so as to be vertically movable. A connecting member having a pair of connecting shafts externally inserted into an upper portion of the needle bar guiding member and projecting in a direction perpendicular to the vertical direction and substantially perpendicular to the predetermined direction; A connecting shaft supporting member including a shaft portion inserted into the needle swinging moving body so as to be substantially parallel to the predetermined direction, and two supporting portions supporting each of the pair of connecting shafts; An oblique groove is provided at the lower end of the member and runs diagonally on the side. Slidably engages made a groove member and slant grooves,
In an eyelet buttonhole sewing machine including an engaging member that swings the needle bar guide member in the predetermined direction as the needle bar guide member moves up and down, the shaft of the connecting shaft support member extends along the predetermined direction. The connecting shaft supporting member is formed so that two surfaces substantially parallel to the predetermined direction and parallel to each other oppose each other; The eyelet sewing machine is slidably held between the two opposing surfaces directly or via an insertion member through which a connection shaft can be inserted. 2. The eyelet according to claim 1, wherein the connecting shaft is formed in a cylindrical shape, and the insertion member is a square top or a roller having a shaft hole having a circular cross section through which the connecting shaft can be inserted. Overlock sewing machine. 3. The eyelet buttonhole sewing machine according to claim 1, further comprising a rotation stopper for preventing the connecting member from rotating about the vertical direction.