JP5197191B2 - Sewing machine opener mechanism - Google Patents

Description

  The present invention relates to an opener mechanism for a sewing machine provided with an opener.

The horizontal hook of the sewing machine is composed of an inner hook and an outer hook, and the inner hook is provided with a protrusion that fits into a recess provided on the bottom surface of the needle plate, and the protrusion serves as a stopper to prevent the outer hook from rotating. doing. On the other hand, the horizontal hook forms a knot between the upper thread and the lower thread by passing through the loop of the upper thread caught by the outer hook. The horizontal hook mechanism is provided with an opener that pulls the end edge of the protrusion on the downstream side in the outer hook rotation direction away from the inner surface of the recess so that the protrusion does not interfere with the operation of passing through the upper thread loop.
This opener is configured so that the inner end of the opener periodically engages with a predetermined trajectory and moves in the same cycle as the needle up-and-down movement, thereby periodically locking the inner hook and pulling the protrusion away from the inner surface of the recess.

By the way, even if the position of the tip of the opener is slightly changed, the contact state with the inner hook changes greatly, and the timing at which the protrusion is separated from the inner surface of the recess and the period during which the separation is continued fluctuate greatly. As a result, the adjustment of the position of the tip of the opener requires a very fine adjustment and is difficult.
For this reason, the conventional opener mechanism has a structure in which a long hole is provided at the base end of the opener and fastened with a fixing screw to the support arm of the opener, and the position of the tip of the opener can be adjusted along the long hole. In addition, the position can be adjusted along the rotation direction around the fixing screw. Then, a slit is formed on both the opener and its supporting arm so as to be aligned in a single letter, and one side end of the driver's tip is inserted into the opener side slit, and the other side end is inserted into the support arm side slit. The position of the opener is adjusted by sliding the opener by rotating the screwdriver after inserting the screwdriver (see, for example, Patent Document 1).
JP-A-8-243284

However, in the conventional opener mechanism, due to the side fitting of the opener fixing portion provided on the support arm, the opener rotates clockwise when the fixing screw is tightened, and the rotation amount by the screw tightening is constant. For this reason, during adjustment work, the screw must be inserted into both slits and the fixing screw must be tightened while the position is fixed and the opener is pressed clockwise. Met.
In addition, since the position of the opener is manually held by a screwdriver, it is easy to cause a minute rotation when tightening the fixing screw, and if a deviation occurs at the center of rotation, a large deviation will occur at the tip. It has been difficult to adjust the tip of the opener to a predetermined position.

  An object of the present invention is to easily and accurately adjust the position of the tip of the opener.

According to the first aspect of the present invention, the rotation of the main shaft for moving the sewing needle up and down, the hook shaft to which the rotational driving force of the main shaft is transmitted, and the rotation of the outer hook fixedly connected to the hook shaft are restricted. An opener that periodically engages the inner hook in synchronization with the vertical movement of the sewing machine needle and pulls the protruding portion in a direction to separate the downstream portion of the outer hook rotation direction from the fitting portion, and the opener In the sewing machine opener mechanism, the transmission mechanism includes an eccentric cam fixed to the shuttle shaft, and includes the eccentric cam at one end and the other. comprises a middle hook guide arm which holds the opener at the end, the mobile adjustably taken the opener in the rotation radial direction is attached to rotate adjustable by shaft supporting the opener relative to the in hook guide arm And opener fixing means to attach the angle adjusting member defining a pivot angle of the opener by pressing the tip portion at a position offset from the support shaft for supporting the opener a side of the opener angle adjustment screw And a position adjusting screw that is a position adjusting body that is oriented in the longitudinal direction of the opener and that determines a position along the rotational radial direction by pressing the front end portion against the side surface of the swinging end portion of the inner hook guide arm; It is characterized by providing.

The invention described in claim 2 has the same configuration as that of the invention described in claim 1, and the opener is supported so as to be adjustable in rotation by using a set screw as the fixing means as a support shaft for supporting the opener. The elongate hole part into which the set screw can be inserted is supported so as to be movable and adjustable in the rotational radial direction.

The invention described in claim 3 has the same configuration as that of the invention described in claim 1 or 2, and the opener has an opener tip portion which is a radius of the inner hook by either the rotation adjustment or the movement adjustment. A position displacement occurs along the direction, and the tip of the opener is supported by the transmission mechanism so as to cause a position displacement in a direction perpendicular to the radial direction of the inner hook by the other of the rotation adjustment or the movement adjustment. It is characterized by that.

The invention of claim 4 wherein is provided with a present invention similar to the configuration described in claim 1, with the angle adjusting screw and the position adjusting screw, characterized in that it is a tip-split shape .

According to the first aspect of the invention, since the opener is supported so as to be adjustable in rotation and is supported so as to be adjustable in movement in the radial direction of rotation, the tip of the opener can be adjusted in two degrees of freedom. Thus, it is possible to arbitrarily set the start timing and start period of the pulling operation with respect to the inner hook by the adjustment.
Furthermore, since the rotation angle and the radial position of the opener are determined with respect to the transmission mechanism by pressing the angle adjusting screw that is the angle adjusting body and the position adjusting screw that is the position adjusting body , the angle and the position are determined. Allows fine adjustment. At the time of the fixing operation, the adjustment position of the opener is held by the two adjusting screws pressed together with the fixing means at two locations, so that the opener can be fixed without causing a positional shift. Further, even if a positional deviation occurs, the adjustment state can be easily reproduced because the position of the opener can be returned so as to contact each adjustment screw . Accordingly, it is possible to easily and accurately adjust the tip position of the opener.
Furthermore, the angle adjusting body and the position adjusting body are the angle adjusting screw and the position adjusting screw, respectively, so that the adjustment work can be easily and finely adjusted by the rotation adjustment. Furthermore, since each screw has a position holding force during adjustment, it is possible to avoid a situation in which a deviation occurs due to receiving some external force during the adjustment operation, and it is possible to perform an adjustment operation with good workability and accuracy.

  According to the second aspect of the present invention, the configuration of the elongated hole portion and the set screw enables adjustment of movement in the rotational radial direction along the longitudinal direction of the elongated hole portion, and adjustment of the rotation angle around the set screw. Make it possible. Further, since the support shaft is a set screw, the opener adjusting structure and fixing structure can be easily realized with a small number of parts.

In the invention according to claim 3, since the opener tip can be moved separately from the radial direction of the inner hook or the orthogonal direction thereof by the rotation adjustment and movement adjustment with respect to the opener, the engagement of the opener by the movement in the radial direction. By adjusting the period, the timing of the start and end of engagement can be individually adjusted by moving in the orthogonal direction, and the adjustment work can be performed more easily.

Fourth aspect of the present invention, said angle adjusting screw and the position adjusting screw, since a tip-split shape, can be can be added to the elastic outward, to prevent or inhibit disconnection or loosening It becomes.

(Overall configuration of the embodiment of the invention)
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS. However, although various technically preferable limitations for implementing 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 this embodiment, the direction of each part of the horizontal hook of the sewing machine is determined with reference to the XYZ axes shown in the drawings. In a state where the sewing machine is installed on a horizontal plane, the Z-axis direction indicates the vertical direction that is the vertical direction, the Y-axis direction indicates the left-right direction that coincides with the longitudinal direction of the sewing machine arm portion, the X-axis direction is horizontal and the Y-axis direction An orthogonal front-rear direction (cloth feed direction) is shown. In the figure, an arrow F indicates the cloth feeding direction.

(Horizontal hook of sewing machine)
In the present embodiment, a horizontal shuttle mechanism 100 mounted on a two-needle sewing machine will be described as an example. A two-needle sewing machine is a sewing machine that drives two needles up and down to form two parallel seams, and is equipped with two horizontal shuttles corresponding to each needle individually. Since the needles of the main needle are arranged symmetrically with the needle drop interposed therebetween and have the same configuration, in the present embodiment, only one horizontal hook is shown and described for the sake of simplification of description.
FIG. 1 is a plan view of a horizontal shuttle mechanism 100 of a sewing machine according to this embodiment.
As shown in FIG. 1, the horizontal hook 1 is disposed within the outer hook 70 having a sword tip 71 that captures the upper thread loop formed by the sewing needle by rotation, and the lower surface of the needle plate 80. An inner hook 60 having an inner hook protrusion 61 which is a protrusion that regulates its own rotation accompanying the rotation of the outer hook 70 by loosely fitting between needle plate protrusions 81 and 82 which are fitting parts provided in the hook. The horizontal hook mechanism 100 is configured to pull the horizontal hook 1 and the needle plate protrusion 81 away from the outer hook rotation direction downstream portion of the inner hook protrusion 61 periodically in synchronization with the vertical movement of the sewing machine needle. An opener 10 for drawing, a transmission mechanism 30 for giving a pulling action to the opener 10, and a position adjusting mechanism 50 for adjusting the position of the opener tip 11 of the opener 10 are provided.
The horizontal hook mechanism 100 is provided below the needle plate 80 of the sewing machine, and forms a loop by supplementing the upper thread from the sewing needle inserted into the needle hole of the feed dog 40 at the time of sewing. It has a function to pass through. Further, the horizontal hook 1 is mounted inside the sewing machine so that the rotation center line of the outer hook 70 is along the vertical vertical direction in a state where the sewing machine is installed on a horizontal plane. Hereinafter, each part will be described in detail.

(Outer pot)
As shown in FIG. 1, the outer hook 70 has a substantially cylindrical shape as a whole, and is driven to rotate about the center line of the cylindrical shape. That is, the outer hook 70 is rotationally driven around a hook shaft 72 that is closed at the bottom side and is concentrically fixedly connected to the bottom face.
The shuttle shaft 72 is supported in the sewing machine frame so as to be vertical when the sewing machine is installed on a horizontal plane. The shuttle shaft gear (not shown) is used as a drive shaft for moving the sewing needle up and down. The rotational driving force is transmitted by a known transmission mechanism via the. Such a transmission mechanism rotationally drives the shuttle shaft 72 at a rotational speed that is twice the rotational speed of the sewing machine main shaft. In other words, the outer hook 70 is driven to rotate at a rotational speed twice the frequency of the vertical movement of the sewing needle.
On the outer peripheral surface of the outer hook 70, a sword tip 71 is extended slightly outward from the circumferential direction so that the locus of the tip of the sword tip 71 slightly deviates from the needle drop position of the sewing needle. Is set. Thereby, when the outer hook 70 rotates, the upper thread can be captured from the sewing needle at the sword tip 71. The outer hook 70 is driven to rotate in the extending direction of the sword tip 71 (clockwise direction A in FIG. 1).
A race surface (not shown) that slides on the outer peripheral surface of the inner hook 60 that is coaxially disposed in the outer hook 70 is provided on the inner peripheral surface of the outer hook 70 along the inner periphery of the outer hook 70. It has been.

(Cooking pot)
The inner hook 60 is stored inside the outer hook 70 in a state where the upper portion of the outer hook 70 is viewed from the opened upper portion of the outer hook 70.
The inner hook 60 is stored so as to be rotatable with respect to the outer hook 70, and an upper hook protrusion 61 for restricting the interlocking rotation with the outer hook 70 toward the radially outer side of the inner hook 60 is arranged on the upper portion thereof. It is extended. On the other hand, a pair of needle plate projections 81 and 82 are provided on the lower surface side of the needle plate 80 as a fitting portion to be fitted to the inner hook projection 61. These two needle plate projections 81, An intermediate hook projection 61 is loosely fitted between 82. Each needle plate projection 81, 82 is provided with a gap between them wider than the width of the hook projection 61. One needle plate projection 81 rotates the outer hook 70 relative to the hook projection 61. The other needle plate projection 82 is located on the upstream side in the rotational direction of the outer hook 70 with respect to the middle hook protrusion 61. That is, the inner hook 60 can be slightly swung in the gap in a state where the inner hook protrusion 61 is loosely fitted between the pair of needle plate protrusions 81 and 82.
Further, when the outer hook 70 is rotationally driven, the inner hook 60 is driven to rotate from the outer hook 70 by friction between the race surface formed on the inner periphery of the outer hook 70 and the outer peripheral surface of the inner hook 60. Power is transmitted. For this reason, the state that the inner hook protrusion 61 is in contact with the throat plate protrusion 81 located on the downstream side in the rotation direction of the outer hook 70 is maintained except that it is pulled by an opener 10 described later during sewing. It has become so.
Further, the inner hook 60 has a support shaft provided on the upper portion thereof so as to protrude coaxially with the rotation shafts of the inner hook 60 and the outer hook 70. A bobbin as a lower thread supply source (not shown) is replaceably and rotatably mounted on the support shaft. A bobbin case 65 is detachably fixed to the tip of the support shaft, and the bobbin is stored and held by the bobbin case 65 and the inner hook 60.
On the upper outer edge of the bobbin case 65, an abutting portion (wing portion) 66 having a hook-like and convex corner portion on the radially outer side is provided. As shown in FIG. 1, the contact portion 66 is provided at a position facing an opener tip portion 11 of the opener 10 to be described later on the upstream side in the rotational direction from the hook projection 61. The opener tip 11 that is driven by the rotation of the sewing machine spindle acts on the abutting portion 66, so that the inner hook 60 is periodically given a rotational force, that is, a pulling force toward the upstream side in the outer hook rotation direction. It has become so.

(Opener and transmission mechanism)
The opener 10 is engaged with the abutting portion 66 of the inner hook 60 at the opener tip portion 11 and is pulled so as to hook the abutting portion 66, so that the above-described inner hook protrusion 61 and the inner hook protrusion 61 of the horizontal hook 1 are pulled. A gap is periodically formed in synchronism with the rotation of the outer hook 70 between the hook protrusion 61 and the needle plate protrusion 81 that comes into contact with the hook protrusion 61 from the downstream side of the outer hook rotation direction.
On the other hand, as shown in FIG. 1, the transmission mechanism 30 includes an eccentric cam 31 fixed to the shuttle shaft 72, and holds the eccentric cam 31 at one end and an opener via a position adjusting mechanism 50 at the other end. A hook guide arm 32 holding 10 and one end portion of the hook guide link shaft 34 are supported so as to be swingable, and the other end portion can be rotated to a middle portion of the hook guide arm 32 via a pin 37. And a hook guide link 33 connected to each other. When the eccentric cam 31 is regarded as one link, the transmission mechanism 30 is considered to be a crank lever type four-bar link mechanism including the eccentric cam 31, the hook guide arm 32, and the hook guide link 33. When the eccentric cam 31 is rotated using the torque from the sewing machine motor, it is possible to apply an elliptical motion to the opener tip 11 via the inner hook guide arm 32. Further, since power is obtained from the shuttle shaft 72, it is possible to apply an elliptical motion to the opener 10 at a rotational speed twice that of the sewing needle in synchronization with the vertical movement of the sewing needle.

The opener distal end portion 11 is curved toward the inner hook 60 side, and the inner hook guide arm 32 swings while being regulated by the inner hook guide link 33 due to the rotation of the eccentric cam 31 accompanying the rotation of the hook shaft 72. In addition, the opener tip 11 abutted on the inner hook abutting portion 66 draws an elliptical motion locus as shown in FIG. That is, the opener tip 11 when the inner hook 60 is rotated away from the needle plate protrusion 81 by rotating the inner hook 60 in the direction opposite to the outer hook rotation direction (the direction of arrow A in FIG. 1) is the rotation of the outer hook 70. Similar to the direction A, an elliptical orbit D1 is drawn in the clockwise direction.

Here, as shown in FIG. 2, the elliptical track D <b> 1 is long in the direction along the rotation locus of the inner hook contact portion 66 (the long diameter is tangent to the rotation locus of the inner hook contact portion 66. Is generally parallel to the direction). As is apparent from the elliptical orbit D1, the speed of the opener tip 11 is decelerated to a low speed just before it hits the inner hook abutting portion 66. Therefore, the collision noise between the opener tip 11 and the hook contact portion 66 is mitigated. Further, as shown in FIG. 2, the speed component when the opener tip 11 abuts against the inner hook abutting portion 66 is larger in the Y direction than in the X direction. Since the amount of swinging of the inner hook 60 can be kept small while sufficiently securing the time for the upper thread to pass between the lower thread, the lower thread tension is stable and a good seam can be formed. Further, the opening speed of the opener tip 11 is increased in the X-axis direction after coming into contact with the inner hook abutting portion 66, but before it leaves the inner hook abutting portion 66, it is again decelerated to a lower speed. Therefore, the inner hook 60 is rotated slowly, and the collision between the inner hook protrusion 61 and the needle plate protrusion 82 due to the vigorous rotation of the inner hook 60 can be avoided, and a large collision sound is generated. There is nothing to do.

  As described above, the opener 10 is engaged with the inner hook abutting portion 66 only in a part of the elliptical orbit D, and the inner hook 60 acts only on the reverse side in the rotational direction. When the engagement is disengaged, the inner hook 60 is quickly rotated by the rotating action of the outer hook 70 and can be returned to the state where the downstream portion of the inner hook protrusion 61 in the outer hook rotation direction is in contact with the needle plate protrusion 81. It is like that.

(Position adjustment mechanism)
A position adjusting mechanism 50 that adjusts the position of the opener tip 11 will be described with reference to FIGS. FIG. 3 is a perspective view of the horizontal hook mechanism 100, and FIG. 4 is an enlarged plan view of the inner hook guide arm 32.
The adjusting mechanism 50 includes a fixing means 51 for fixing the opener 10 to the inner hook guide arm 32, a position adjusting means 54 for adjusting movement along the longitudinal direction (extending direction) of the opener 10, and a support for the opener 10. An angle adjusting screw 58 is provided as angle adjusting means for adjusting a rotation angle around a step screw 53 (described later) as a set screw serving as a shaft.
The fixing means 51 is a stepped screw 53 having an elongated hole portion 52 formed along the longitudinal direction of the opener 10 provided in the vicinity of the proximal end portion of the opener 10 and a support shaft portion inserted into the elongated hole portion 52. And a fitting groove 59 for fitting the opener 10 formed on the upper surface of the swinging end portion of the inner hook guide arm 32. The stepped screw 53 is formed with a male screw at its tip, and can be screwed into a screw hole 53b provided on the side of the hook guide arm 32 side. The intermediate portion of the step screw 53 is a support shaft portion 53 a on which no screw is formed. The outer diameter of the step screw 53 is substantially equal to the width of the short diameter of the long hole portion 52 and can be inserted into the long hole portion 52. The diameter is set.
Then, when the step screw 53 is fastened, the opener 10 is sandwiched from above and below to be fixed so that it cannot move and rotate with respect to the inner hook guide arm 32, and when loosened, the opener 10 rotates around the support shaft portion 53a. It is possible to move and adjust the movement along the long hole portion 52.

The position adjusting means 54 includes a flat portion 55 formed by bending the base end portion of the opener 10 downward, and a position adjusting screw 56 screwed into a screw hole provided in the flat portion. The flat surface portion 55 is orthogonal to the longitudinal direction of the opener 10 and is in close proximity to the side surface of the swing end portion of the inner hook guide arm 32. The position adjusting screw 56 is screwed into the screw hole so as to be perpendicular to the flat surface portion 55, and the center line direction of the position adjusting screw 56 coincides with the longitudinal direction of the long hole portion 52 described above. Yes. When a rotation operation is applied, the tip end portion can be pressed against the side surface of the swinging end portion of the inner hook guide arm 32, and the position adjusting screw 56 is further moved in a state where the tip end portion is pressed. When the screwdriver is further turned in the screwing direction, the opener 10 moves backward through the long hole portion 52 due to the reaction and can be adjusted in position. In order to adjust the position in the reverse direction, the opener 10 is pushed forward and the tip of the position adjusting screw 56 is pressed against the side surface of the swinging end portion of the inner hook guide arm 32 to rotate in the reverse direction.
Further, the position adjusting screw 56 has a cracked shape, and has a structure for applying an elastic force to the screw hole. Therefore, it is possible to prevent / suppress loosening and dropping of the position adjusting screw 56.

The fitting groove portion 59 is formed along the direction in which the opener 10 should be directed on the upper surface of the swinging end portion of the inner hook guide arm 32 (the direction in which the opener tip portion 11 is in the vicinity of the inner hook contact portion 66). . The aforementioned screw hole 53 b of the stepped screw 53 is formed on the inner bottom surface of the fitting groove 59. The groove width of the fitting groove 59 at the position where the screw hole 53b is formed is set to be approximately equal to the lateral width of the base end portion of the opener 10 (there is a margin that can be fitted), and the screw hole 53b is formed. The groove width is set so as to expand from the position toward both the front and rear sides in the course direction of the groove. In other words, the angle adjustment is performed by rotating the opener 10 with the stepped screw 53 as a support shaft, so that the rotation is allowed by making the both sides of the fitting groove 59 widen.

The angle adjusting screw 58 is screwed into a screw hole penetrating from the side surface of the swinging end portion of the inner hook guide arm 32 to the inside of the fitting groove portion 59, and the tip end portion of the angle adjusting screw 58 is the side surface of the opener 10. The position is set so as to abut against. The angle adjusting screw 58 is parallel to the XY plane and is directed in a direction substantially orthogonal to the opener 10, and the tip portion thereof is positioned closer to the tip side of the opener 10 than the step screw 53 ( (It may be a position from the base end portion) and is arranged so as to contact the side surface.
That is, when a rotation operation is applied to the angle adjustment screw 58, the tip end portion can be pressed to a position on the side surface of the opener 10 and deviated from the rotation center, and the angle adjustment screw 58 is further screwed. When turned in the direction of insertion, the tip of the screw pushes the opener 10 and rotates in the counterclockwise direction in FIG. 1 so that the angle can be adjusted. In order to adjust the angle in the clockwise direction, the opener 10 may be rotated in the reverse direction while pushing the opener 10 in the clockwise direction while bringing the tip of the angle adjusting screw 58 into contact with the opener 10.
The angle adjusting screw 58 is also shaped like a tip, and has a structure for applying an elastic force to the screw hole. Therefore, similarly to the position adjusting screw 56, it is possible to prevent and suppress loosening and falling off.

(Adjustment work by position adjustment mechanism)
When the position of the opener tip 11 of the opener 10 is adjusted, first, the set screw 53 is loosened to make the opener 10 move back and forth and turn freely. Then, either the movement adjustment or the angle adjustment may be preceded, but here, the position adjustment will be described first.
At the time of position adjustment, as described above, the opener 10 can be moved back and forth by rotating the position adjusting screw 56, so that the front-rear position of the opener tip 11 is appropriately adjusted. At this time, the moving direction of the opener tip 11 by the position adjusting screw 56 is substantially along the tangential direction of the arc centering on the hook shaft 72 at the position of the inner hook abutting portion 66, and the adjusting operation of the position adjusting screw 56 is performed. Thus, the elliptical trajectory D1 shown in FIG. 2 can be moved along the tangential direction (for example, the position of the elliptical trajectory D2). Since the elliptical trajectory D1 moves in the tangential direction by this position adjustment, the start timing (phase) and release timing (phase) of the pulling operation of the inner hook 60 by the opener 10 can be adjusted. For example, when the position is adjusted like the elliptical trajectory D2, the trajectory moves to the upstream side in the moving direction of the opener tip 11 , so that both the start timing and the release timing can be delayed.

Next, at the time of angle adjustment, as described above, the angle of the opener 10 can be changed by rotating the angle adjusting screw 58, so the left and right positions of the opener tip 11 are adjusted as appropriate. At this time, the moving direction of the opener tip 11 by the angle adjusting screw 58 is generally along the radial direction of the arc centering on the hook shaft 72 at the position of the inner hook contact part 66, and the adjusting operation of the angle adjusting screw 58 is performed. 2 can move the elliptical orbit D1 shown in FIG. 2 along the radial direction (for example, the position of the elliptical orbit D3). Since the elliptical orbit D1 moves in the radial direction by this position adjustment, the execution period (phase) of the pulling of the inner hook 60 by the opener 10 can be adjusted. For example, when the position is adjusted radially inward as in the elliptical orbit D3, the pulling period can be lengthened. In this adjustment, since the start timing and release timing of the pulling operation also change, usually the position adjustment is also essential in the angle adjustment.
And after the angle and position of the opener 10 are determined, the opener 10 is fixed in the state after the fastening screw 53 is fastened and adjusted again.

(Effect of the embodiment of the invention)
As described above, according to the position adjusting mechanism 50 of the horizontal shuttle mechanism 100 of the sewing machine according to the present embodiment, the opener 10 is supported by the fixing means 51 so as to be capable of adjusting the rotation around the set screw 53, and Since it is supported so as to be movable and adjustable in the moving radius direction, it is possible to adjust the movement of the opener tip 11 with two degrees of freedom. It becomes possible to set.
Furthermore, since the angle and the moving position of the opener 10 with respect to the inner hook guide arm 32 are determined by the pressing of the angle adjusting screw 58 and the position adjusting screw 56, the angle and the position can be finely adjusted. Further, during the fixing operation, the adjustment position of the opener 10 is held by the two adjusting screws 56 and 58 pressed in two places together with the fixing means 51, so that the opener can be fixed without causing a positional shift. Moreover, even if a positional deviation occurs, the position of the opener 10 may be returned so as to contact the screws 56 and 58, so that the adjustment state can be easily reproduced. Accordingly, it is possible to easily and accurately adjust the tip position of the opener.

Further, the position adjusting mechanism 50 can be moved in the tangential direction at the position of the contact portion 66 of the inner hook 60 by adjusting the movement of the opener tip 11 and in the inner hook radial direction by adjusting the rotation angle. It is possible to adjust the engagement period of the opener by moving in the direction, and individually adjust the timing of the start and end of engagement by moving in the tangential direction. It becomes clear and adjustment work can be performed more easily.
Incidentally, the opener distal end portion 11 is moved in the radial direction by the movement adjustment of the opener distal end portion 11, the angle adjustment may be configured to move in the tangential direction.

(Other)
FIG. 5 is a plan view showing a modified example of each configuration in the horizontal shuttle mechanism 100 described above.
That is, as shown in the figure, the angle adjusting means 58A may be composed of a boss-like pin 58Aa as an angle adjusting body and a fixing screw 58Ab for fixing the pin. The pin 58Aa is inserted into a through-hole provided in the same position and in the same direction as the angle adjustment screw 58 in place of the screw hole, the tip portion is pressed against the side surface of the opener 10, and the fixing screw 58Ab is the outer periphery of the pin 58Aa. Fastened by fastening from the surface side. Such a configuration can also achieve the same effect as the angle adjustment screw 58.

  Further, in the above-described fitting groove 59, both end portions of the fitting groove 59 are expanded to allow the opener 10 to rotate. However, in the example of FIG. 5, the fitting groove 59A is straight (the inner surfaces on both sides are parallel to each other). Instead, the lateral width of the base end portion 12A of the opener 10 is the widest at the position of the long hole portion 52, and the width becomes narrower toward the both end portions of the opener 10 (so-called drum shape). ). Even in such a configuration, it is possible to allow the opener 10 to rotate.

It is a top view which shows the horizontal shuttle mechanism of the sewing machine which is this embodiment. It is a top view of an inner pot. It is a perspective view of a horizontal shuttle mechanism. It is an enlarged plan view of a hook guide arm. It is the top view which showed the example of a change in the structure of a part of horizontal hook mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horizontal hook 10 Opener 11 Opener front-end | tip part 30 Transmission mechanism 32 Middle hook guide arm 50 Adjustment mechanism 51 Fixing means 52 Long hole part 53 Step screw (set screw)
54 Position adjusting means 56 Position adjusting screw (position adjusting body)
58 Angle adjustment screw (angle adjustment body)
60 Center hook 61 Center hook protrusion (protrusion)
66 Contact part 70 Outer hook 71 Blade point 80 Needle plate 81, 82 Needle plate protrusion (fitting part)
100 Horizontal hook mechanism of sewing machine

Claims (4)

A sewing machine spindle that moves the sewing needle up and down;
A shuttle shaft to which the rotational driving force of the sewing machine main shaft is transmitted;
The downstream portion of the protrusion in the outer hook rotation direction is periodically engaged with the inner hook whose rotation with rotation of the outer hook fixedly connected to the hook shaft is restricted in synchronization with the vertical movement of the sewing needle. And an opener that pulls in a direction to separate the mating part,
In the opener mechanism of the sewing machine comprising the transmission mechanism that imparts the periodic pulling action to the opener,
The transmission mechanism includes an eccentric cam fixed to the hook shaft, and an inner hook guide arm that holds the eccentric cam at one end and holds an opener at the other end.
An opener fixing means for attaching the opener to the inner hook guide arm so as to be able to turn and adjust to move in the turning radial direction by a support shaft supporting the opener;
An angle adjusting screw that is an angle adjusting body that determines the rotation angle of the opener by pressing the tip of the opener on a side surface of the opener and shifted from a support shaft that supports the opener;
A position adjusting screw that is oriented in the longitudinal direction of the opener, and that is a position adjusting body that determines a position along the rotational radial direction by pressing the tip of the opener against the side surface of the swinging end of the inner hook guide arm. Sewing machine opener mechanism. The opener is supported by a set screw as the fixing means so as to be rotatable and adjustable as a support shaft for supporting the opener, and can be adjusted in a moving radial direction by an elongated hole portion into which the set screw can be inserted. The opener mechanism for a sewing machine according to claim 1, wherein the opener mechanism is supported.   The opener has a position displaced along the radial direction of the inner hook by either the rotation adjustment or the movement adjustment, and the opener tip by the other of the rotation adjustment or movement adjustment. The sewing machine opener mechanism according to claim 1 or 2, wherein the transmission mechanism is supported by the transmission mechanism so as to cause a displacement in a direction perpendicular to a radial direction of the inner hook.   The opener mechanism for a sewing machine according to any one of claims 1 to 3, wherein the angle adjusting screw and the position adjusting screw have a cracked shape.

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