JP2009061031A - Button holing sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain high-speed needle swinging operation by reducing force applied to a journal part in a mechanism in needle swinging operation. <P>SOLUTION: This buttonholing sewing machine includes a needle bar vertical driving mechanism for vertically moving a needle bar, and a needle swinging mechanism for swinging the needle bar synchronously with the needle bar vertical driving mechanism. The needle swinging mechanism includes a needle bar guide part through which the needle bar is slidably inserted; a first journal part surrounding the needle bar guide part and journaling the needle bar guide part turnably and slidably on both side across the needle bar so that the needle bar guide part turns around a direction, orthogonal to the axial direction of the needle bar, as a turning axis and slides in a direction of the turning axis of the needle bar guide part; and a second journal part holding the first journal part by a pair of support pieces in an extending direction of the turning axis of the first journal part to journal the first journal part turnably and slidably so that the first journal part turns around a direction, orthogonal to both the axial direction of the needle bar and the turning axis of the first journal part, as a turning axis and that the first journal part slides in the turning axis direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a buttonhole sewing machine, and more particularly, to a buttonhole sewing machine including a needle bar vertical drive mechanism and a needle swing mechanism.

  Conventionally, as a sewing machine, a needle bar vertical drive mechanism that drives a needle bar with a sewing needle fixed up and down, and a needle swing mechanism that swings the needle bar left and right in synchronization with the needle bar vertical drive mechanism, a button hole 2. Description of the Related Art A buttonhole overlock sewing machine that performs overlock sewing around is known (for example, see Patent Document 1).

Specifically, as shown in FIG. 5, the conventional buttonhole sewing machine 100 is provided with a needle bar vertical drive mechanism 110 and a needle swing mechanism 130.
The needle bar up / down drive mechanism 110 drives a needle bar 111 having a sewing needle (not shown) at its tip fixed up and down. The needle bar 111 is supported by a free bearing 112 so as to be movable up and down and swingable. A needle bar holder 114 having a pin 113 projecting sideways is provided at an intermediate portion of the needle bar 111. The needle bar holder 114 is connected to the sewing machine main shaft by a link mechanism (not shown), and transmits the rotation of the sewing machine main shaft to the needle bar 111 to move the needle bar 111 up and down.

  The needle swing mechanism 130 is provided with a swing lever 132 that rotates around a shaft 131 based on the rotation of the main spindle of the sewing machine. The base end portion of the connecting rod 133 is rotatably connected to the distal end portion of the swing lever 132. A needle swing lever 134 formed in a substantially L shape is attached to the distal end portion of the connecting rod 133 so as to be swingable around a needle swing shaft 135 that is substantially parallel to the sewing machine main shaft. The connecting rod 133 and the needle swing lever 134 are attached to each other so as to be rotatable. A long hole 134a is formed in the needle swing lever 134, and the upper end portion of the needle swing link 136 is engaged with the long hole 134a. On the other hand, the lower end portion of the needle swing link 136 is rotatably attached to the needle swing rocking body 137. The protruding portion 137b of the needle swinging rocking body 137 is slidably inserted into a groove (not shown) by the rotation of the needle swinging rocking body 137.

  A guide shaft 138 having both ends fixed to metal bearings (not shown) is inserted through the needle swinging rocker 137. Therefore, when the swing lever 132 swings in the direction of the arrow Q1, the connecting rod 133 swings in the direction of the arrow Q2, the tip of the needle swing lever 134 rotates in the direction of the arrow Q3, and the needle swing through the needle swing link 136 is performed. The rocking body 137 reciprocates up and down (in the direction of the arrow Q4) along the guide shaft 138.

  Further, as shown in FIG. 6, the support shaft 140 of the needle swing yoke 139 is slidably inserted into the needle swing rocking body 137 and is rotatably inserted. As shown in FIG. 7, the tip end portion of the needle swing yoke 139 is divided into two forks, and a gripping portion 141 for gripping the connection pins 143 protruding on both sides of the connection collar 142 shown in FIG. It has become. FIG. 9 is a view showing a state in which the connecting collar 142 is supported by the needle swing yoke 139. When the support shaft 140 of the needle swing yoke 139 is inserted into the needle swing rocking body 137, the needle swing yoke 139 itself is slidable in the direction of the arrow Q5 and is rotatable in the direction of the arrow Q6. The needle swinging yoke 139 is slidable in the direction of the arrow Q7 and is rotatable in the direction of the arrow Q8.

  As shown in FIGS. 5 and 10, the needle bar 111 is inserted into the fixed collar 144, the connecting collar 142, the needle bar guide member 150, and the block portion 160 in order from the top so as to be movable up and down. The sewing needle is fixed to

  As shown in FIG. 11, oblique grooves 161 are formed obliquely on both side surfaces of the block portion 160 fixed to the lower portion of the needle bar guide member 150. Guide pins 162 slidably held by the needle bar rotating bracket 170 are engaged with the oblique grooves 161, respectively. As shown in FIG. 10, a needle bar guide member 150 is inserted into the needle bar rotating bracket 170 so as to be movable up and down. The guide pin 162 is pressed against the oblique groove 161 by a spring 163 and slidably engages with the oblique groove 161.

  Further, as shown in FIG. 5, a connecting collar 142 is extrapolated on the upper part of the needle bar guide member 150 protruding from the needle bar rotating bracket 170, and a fixed collar 144 is extrapolated thereon. The connecting collar 142 is sandwiched so as to be rotatable along the peripheral surface of the needle bar guide member 150.

According to the needle swing mechanism 130, when the main spindle of the sewing machine rotates, the needle swing rocker 137 reciprocates up and down along the guide shaft 138 via the swing lever 132, the connecting rod 133, and the needle swing lever 134. Accordingly, the needle bar guide member 150 is also reciprocated up and down by a predetermined amount via the needle swing yoke 139 attached to the needle swing rocking body 137 and the connecting collar 142. At this time, since the guide pin 162 is engaged with the oblique groove 161 of the block portion 160, the block portion 160 moves up and down while swinging left and right along the direction of the oblique groove 161 (FIG. 11). Therefore, the needle bar guide member 150 is swung in the direction of the arrow Q9, and the needle bar 111 is also swung in the same direction with a predetermined width. When the needle bar 111 is driven up and down by the needle bar vertical drive mechanism 110, the needle bar 111 is swung in the direction of the arrow Q9 by the needle swinging mechanism 130 for each needle.
FIG. 12 shows the stitches of the eyelet holes. In the range of A and C, the seam is in the lateral direction, but in the range of B, the seam is formed radially and obliquely. The horizontal direction in FIG. 12 corresponds to Q9 in FIG. When the range of A and C is sewn, the parts constituting the needle swing mechanism are arranged in the posture shown in FIG. 5, and the needle is swung in the direction of Q9. At this time, the support shaft 140 moves relative to the needle swinging rocker 137 by the distance that the connection collar 142 has moved relative to the guide shaft 138, so that the connection between the connection pin 143 and the gripping portion 141 is maintained. On the other hand, when sewing the range of B, it is turned according to the direction of the seam formed by the needle bar turning bracket 170 by a turning mechanism (not shown). As the needle bar turning bracket 170 is moved, the block 160, the guide pin 162, the needle bar guide member 150, and the needle bar 111 are also turned, so that the needle swinging direction moves toward the seam. At this time, the distance of the movement of the connecting collar 142 with respect to the guide shaft 138 corresponds to the components in the respective movable directions of the support shaft 140 with respect to the needle swinging rocking body 137 and the gripping portion 141 with respect to the connecting pin 143. , The connection between the connecting pin 143 and the gripping part 141 is maintained.
JP 2001-300184 A

  Here, when the needle bar 111 swings by the needle swinging mechanism 130, the support shaft 140 of the needle swinging yoke 139 is axially moved in the holding hole 137a provided in the needle swinging swinging body 137 (the horizontal direction in FIG. 6). However, the gripping portion 141 of the needle swinging yoke 139 is supported by a force that drives the needle bar 4 up and down in a direction (vertical direction in FIG. 6) perpendicular to the axis of the support shaft 140. Since it acts as a force for inclining the shaft 140, the support shaft 140 will squeeze the holding hole 137a. For this reason, when the needle swinging operation is performed at a high speed, the support shaft 140 squeezes the holding hole 137a and seizure occurs, making it difficult to increase the speed of the apparatus.

  An object of the present invention is to reduce a force applied to a shaft support portion in a mechanism during a needle swinging operation and to enable a high-speed needle swinging operation.

The invention described in claim 1
In a buttonhole sewing machine comprising a needle bar vertical drive mechanism that moves the needle bar up and down, and a needle swing mechanism that swings the needle bar in synchronization with the needle bar vertical drive mechanism,
The needle swing mechanism is
In order to guide the needle bar in the rotational direction and the vertical direction about the axis, the needle bar guide portion through which the needle bar is slidably inserted;
The needle bar guide part rotates around the needle bar guide part around a direction orthogonal to the axial direction of the needle bar, and the needle bar guide part rotates the needle bar guide part. A first shaft support portion that pivotally and slidably supports the needle bar guide portion at both sides sandwiching the needle bar so as to slide in the axial direction;
The first shaft support portion rotates about a direction orthogonal to both the axial direction of the needle bar and the rotation shaft of the first shaft support portion, and the first shaft support portion corresponds to the rotation shaft. A second shaft support portion pivotably and slidably supported by a pair of support pieces sandwiching the first shaft support portion in the extending direction of the rotation shaft of the first shaft support portion so as to slide in a direction It is characterized by having.

  According to the present invention, the needle bar is pivotably and slidably supported by both side portions of the first shaft support portion, and the first shaft support portion is freely rotatable by the pair of support pieces of the second shaft support portion. Since the shaft is slidably supported, the needle bar and the first shaft support are each supported at two points, thereby reducing the force per shaft support generated when the needle bar is swung. be able to. Thereby, a high-speed needle swinging operation is possible.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. However, although various technically preferable limitations for carrying out the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples. In addition, the same code | symbol is attached | subjected about the same location as a conventional thing, and the description is abbreviate | omitted.

  FIG. 1 is a perspective view showing a schematic configuration of a buttonhole sewing machine, and FIG. 2 is a side view of FIG. As shown in FIGS. 1 and 2, the buttonhole sewing machine (hereinafter referred to as sewing machine 1) includes a sewing machine main shaft 2, a drive belt 21, and pulleys 22 and 23, and the rotation speed of the sewing machine main shaft 2 is halved. , The needle bar 4, the needle bar 4, the needle bar vertical drive mechanism 5 that moves the needle bar 4 up and down based on the rotation of the sewing machine main shaft 2, and the needle bar 4 based on the rotation of the rotary shaft 3. And a needle swinging mechanism 7 that swings left and right.

FIG. 3 is a perspective view showing a schematic configuration of the needle bar 4, the needle bar vertical drive mechanism 5, and the needle swing mechanism 7.
As shown in FIG. 3, the needle bar 4 has a sewing needle 41 fixed to the tip thereof. The needle bar 4 is supported by a free bearing 42 so as to be movable up and down and swingable. A needle bar holder 43 is attached to an intermediate portion of the needle bar 4. The needle bar holder 43 is connected to the sewing machine main shaft 2 via the needle bar vertical drive mechanism 5, and transmits the rotation of the sewing machine main shaft 2 to the needle bar 4 to move the needle bar 4 up and down. ing.

  The needle bar up-and-down drive mechanism 5 has a rotating weight 51 fixedly connected to the front end of the sewing machine main shaft 2 and rotating, and one end connected to a position eccentric from the center of rotation of the rotating weight 51 and the other end. A crank rod 52 connected to the needle bar holder 43 is provided. Accordingly, when the sewing machine main shaft 2 rotates, the rotary weight 51 also rotates accordingly, and the crank rod 52 moves the needle bar holder 43 up and down.

FIG. 4 is a top view showing a schematic configuration of the needle swing mechanism 7.
As shown in FIGS. 1 to 4, the needle swinging mechanism 7 is provided with a swing link 72 that rotates in the front-rear direction about the shaft 71 based on the rotation of the rotary shaft 3. A needle swing link 73 is connected to the lower end of the swing link 72.

  The needle swing mechanism 7 has a needle bar guide portion through which the needle bar 4 is slidably inserted in order to guide the needle bar 4 in the rotational direction and the vertical direction about the axis of the needle bar 4. 74 is provided. In the needle bar guide portion 74, a needle bar guide member 150 into which the needle bar 4 is slidably inserted and a needle bar guide member 150 are integrally fitted, and a pair of first shafts 78 projecting in the front-rear direction. And a fitting portion 77 in which is formed.

  A block 160 is fixed to the lower portion of the needle bar guide member 150, and oblique grooves 161 (not shown) are formed on both side surfaces of the block 160 (see FIGS. 10 and 11). Guide pins 162 that are slidably held by the needle bar rotating bracket 170 are engaged with the oblique grooves 161, respectively. A needle bar guide member 150 is inserted into the needle bar rotation bracket 170 so as to be movable up and down. The guide pin 162 is pressed against the oblique groove 161 by the spring 163 and slidably engages with the oblique groove 161.

The pair of first shafts 78 of the fitting portion 77 is supported by a first shaft support portion 79 surrounding the needle bar guide portion 74. The first shaft support portion 79 is provided with a main body portion 80 having a rectangular shape when viewed from above, and a pair of second shafts 81 protruding from the main body portion 80 in the left-right direction.
A first shaft 78 is pivotally supported on both side portions (front side portion 82 and rear side portion 83 in the present embodiment) sandwiching the needle bar 4 in the main body portion 80 so as to be rotatable and slidable in the front-rear direction. A through hole 84 is formed. The needle bar guide portion 74 on which the first shaft 78 is pivotally supported by the first through hole 84 is rotatable about the left-right direction (the direction orthogonal to the axial direction of the needle bar 4) as a rotation axis, and further to the left-right direction ( The needle bar guide 74 can be slid in the rotation axis direction).

  The second shaft 81 of the first shaft support 79 is supported by a second shaft support 85 connected to the needle swing link 73. A pair of extending pieces 87 are formed at the rear portion of the second shaft support portion 85 so as to extend rearward substantially in parallel with each other. The pair of extending pieces 87 are pivotally supported by a rotating shaft 88 arranged in the same straight line. Further, a support piece 89 is formed at the front portion of the second shaft support portion 85 so as to extend substantially in parallel with each other toward the front. A second through hole 90 that pivotally supports the second shaft 81 so as to be rotatable and slidable in the left-right direction is formed at the tip of the support piece 89 (see FIG. 4). When the second shaft 81 is pivotally supported by the second through-hole 90, the second pivot support portion 85 pivotally and slidably supports the first pivot support portion 79 in the left-right direction. As a result, the first shaft support portion 79 can rotate about the front-rear direction (the direction orthogonal to both the axial direction of the needle bar 4 and the rotation shaft of the first shaft support portion 79) as a rotation axis, and It is slidable in the front-rear direction (the rotation axis direction of the first shaft support portion 79).

  As shown in FIG. 3, a fixed collar 144 is extrapolated on the upper portion of the needle bar guide member 150 protruding from the needle bar rotating bracket 170.

Next, the operation of this embodiment will be described.
First, when the sewing machine main shaft 2 rotates, the rotating weight 51 also rotates with the rotation, and the crank rod 52 moves the needle bar holder 43 up and down, and the needle bar 4 moves up and down.
During the vertical movement, the rotary shaft 3 is also rotated with the rotation of the sewing machine main shaft 2. When the rotary shaft 3 rotates, the swing link 72 swings back and forth with the rotation. As the swing link 72 swings, the needle swing link 73 swings in the vertical direction about the rotation shaft 88.

Then, as the needle swing link 73 swings, the second shaft support portion 85 also swings in the vertical direction about the rotation shaft 88, so that the support piece 89 of the second shaft support portion 85 is interposed via the first shaft support portion 79. The needle bar guide 74 is swung in the vertical direction. At this time, since the guide pin 162 is engaged with the oblique groove 161 of the block portion 160, the block portion 160 moves up and down while swinging left and right along the direction of the oblique groove 161 (FIG. 11). Therefore, the needle bar guide member 150 is swung in the left-right direction, and the needle bar 4 is also swung with a predetermined width in the same direction.
Thus, when the needle bar 4 is driven up and down by the needle bar up-and-down drive mechanism 5, the needle bar 4 is swung left and right by the needle swing mechanism 7 for each needle.

Here, when the needle bar turning bracket 170 is turned by a turning mechanism (not shown), the guide pin 162, the block 160, and the needle bar guide member 150 are also turned based on the turning, so that the swinging direction of the needle swing link 73 is increased. Also changes.
The needle bar 4 is swung in various directions by the turning operation, the needle swinging operation, and the up / down operation, and the needle bar 4 is rotated through the universal bearing 42, the first shaft support portion 79, and the second shaft support portion 85. Since it is supported so as to be movable and slidable, it can move in various directions while being securely supported.

  As described above, the needle bar 4 is pivotably and slidably supported by both side portions of the first shaft support portion 79, and the first shaft support portion 79 is supported by the pair of support pieces 89 of the second shaft support portion 85. Since the shaft is pivotably and slidably supported, the needle bar 4 and the first shaft support 79 are each supported at two points. Thereby, the force per one shaft support part generated at the time of the needle swinging operation of the needle bar 4 can be reduced, and the needle swinging operation can be performed at a higher speed than the conventional one.

It is a perspective view which shows schematic structure of the buttonhole sewing machine which concerns on this embodiment. It is a side view which shows schematic structure of the buttonhole sewing machine of FIG. FIG. 2 is a perspective view illustrating a schematic configuration of a needle bar, a needle bar up / down drive mechanism, and a needle swing mechanism provided in the buttonhole sewing machine of FIG. 1. It is a top view which shows schematic structure of the needle swing mechanism of FIG. It is a perspective view which shows schematic structure of the conventional buttonhole sewing machine. FIG. 6 is a side view showing an engagement state between a needle swing rocking body and a needle swing yoke provided in the buttonhole sewing machine of FIG. 5. FIG. 6 is a perspective view showing a schematic configuration of a needle swing yoke provided in the buttonhole sewing machine of FIG. 5. FIG. 6 is a perspective view showing a schematic configuration of a connecting collar provided in the buttonhole sewing machine of FIG. 5. It is a perspective view which shows the engagement state of the needle swing yoke of FIG. 7, and the connection collar of FIG. FIG. 6 is a side view showing an engagement state of a fixed collar, a connecting collar, a needle bar guide member, and a block portion provided in the buttonhole sewing machine of FIG. 5. It is a front view which shows the oblique groove formed in the both sides | surfaces of the block part of FIG. It is explanatory drawing which shows the seam of an eyelet hole.

Explanation of symbols

1 Sewing machine (button hole sewing machine)
2 Sewing machine main shaft 3 Rotating shaft 4 Needle bar 5 Needle bar vertical drive mechanism 7 Needle swing mechanism 41 Sewing needle 79 First shaft support portion 82 Front side portion 83 Rear side portion 85 Second shaft support portion 89 Support piece

Claims (1)

In a buttonhole sewing machine comprising a needle bar vertical drive mechanism that moves the needle bar up and down, and a needle swing mechanism that swings the needle bar in synchronization with the needle bar vertical drive mechanism,
The needle swing mechanism is
In order to guide the needle bar in the rotational direction and the vertical direction about the axis, the needle bar guide portion through which the needle bar is slidably inserted;
The needle bar guide part rotates around the needle bar guide part around a direction orthogonal to the axial direction of the needle bar, and the needle bar guide part rotates the needle bar guide part. A first shaft support portion that pivotally and slidably supports the needle bar guide portion at both sides sandwiching the needle bar so as to slide in the axial direction;
The first shaft support portion rotates about a direction orthogonal to both the axial direction of the needle bar and the rotation shaft of the first shaft support portion, and the first shaft support portion corresponds to the rotation shaft. And a second shaft support portion pivotally and slidably supported with the first shaft support portion sandwiched in an extending direction of the rotation shaft of the first shaft support portion so as to slide in the direction. A buttonhole sewing machine.

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